A scientist plants two rows of corn for experimentation. She puts fertilizer on row 1 but does not put fertilizer on row 2. Both rows receive the same amount of sun and water. She checks the growth of the corn over the course of five months.
Q9) What is the independent variable in this experiment? Why is this variable independent?
Q10) What is the dependent variable in this experiment? Why is this a dependent variable?
Q11) What variables are controlled in this experiment? Why are/is these/this variable control variable(s)?
Answers
Answer:
Q9. The independent variable in this experiment is the fertilizer. It is independent because she manipulating the variable to compare the growth.
Q10. The dependent variable in this experiment is the amount of growth of the corn. It is this because the growth depends on what the scientist did on the corn.
Q11. The variable controlled in this experiment is the amount of sun and water. These two variables never change so this is why it is the control.
Explanation:
Answer:
Explanation:
independent - 5 months dependent - sun controlled - water and the fertilizer
Related Questions
The vapor pressure of a liquid at a given temperature is measured when the rate of evaporation of a liquid becomes
Answers
Answer:
the liquid becomes equal to the rate of condensation
Explanation:
ive come across this question before! and i think its right! :D
The vapor pressure of a liquid at a provided temperature is measured when the rate of evaporation of a liquid evolves equally to the rate of condensation.
What is Evaporation?
Evaporation is the procedure by which water transforms from a liquid to a gas or vapor.
Evaporation is the primary route that water moves from the liquid circumstances around into the water cycle as atmospheric water vapor.
When a molecule around the surface absorbs adequate energy to overwhelm the vapor pressure, it will exit and join the surrounding air as a gas.
Find more information Evaporation here:
https://brainly.com/question/9339710
7.5 L of a gas at 2 ATM and a temperature of 75°C is changed and volume to 3.4 L and a pressure of .5 ATM what is the new temperature
Answers
Answer:
Explanation:
Combined Gas Law
T2= T1P2V2/ (P1V1) = 348.15 X .5 X 3.4/(2 X 7.5) =39.46 K or -233.69C
6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
Convert 3.01 x 10^24 molecules of ammonium sulfate to mass
Answers
Mass of ammonium sulfate = 660.7 g
Further explanationGiven
3.01 x 10²⁴ molecules of ammonium sulfate
Required
mass
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
mol ammonium sulfate (NH₄)₂SO₄ :
n = N : No
n = 3.01 x 10²⁴ : 6.02 x 10²³
n = 5
mass ammonium sulfate :
= mol x MW
= 5 x 132,14 g/mol
= 660.7 g
pls be fr will mark brainliest
Answers
Answer:
1. The two gases making the highest relative contribution to the greenhouse gases are: "CO2 and CH4."
2. The effect of increasing amount of greenhouse gasses is: "All of the above"
3. Which one of the following is a wrong statement?: "Eutrophication is a natural phenomenon in freshwater bodies"
4. The major contributors to the greenhouse gases are: "All of the above"
Explanation:
CO2 is carbon dioxide, and CH4 is methane. Also, the greenhouse gas effect is natural, except, the amount of greenhouse gases is not.
How many water molecules are found within the crystalline structure of one hydrate molecule?
What is the molecular formula of the hydrate?
Attached my worksheets to it and the questions
Answers
a. The Mass of water driven off = 0.15 g
b. Moles of anhydrate = 0.00257 moles
c. Moles of water driven off is 0.00833 moles
d. There are 3 moles of water within the crystalline structure of one molecule of the hydrated salt.
e. The molecular formula of the hydrated salt will be X.3H₂O
What is the mass of water driven off from the hydrated salt?a. The mass of water driven off from the hydrated salt is:
Mass of water driven off = 0.5 g - 0.35 g
Mass of water driven off = 0.15 g
b. Molecular mass of salt = 136 g/mol
moles of anhydrate = 0.35/136
Moles of anhydrate = 0.00257 moles
c. Moles of water driven off = mass/molar mass
molar mass of water = 18 g/mol
Moles of water driven off = 0.15/18
Moles of water driven off = 0.00833 moles
d. Moles of water within the crystalline structure of one molecule of the hydrated salt is determined by converting to whole number mole ratio by dividing with the smallest ratio,
Salt to water ratio = 0.00257 /0.00257 : 0.00833/0.00257
Salt to water ratio = 1 : 3
Therefore, there are 3 moles of water within the crystalline structure of one molecule of the hydrated salt.
e. Assuming the anhydrous salt is X, the molecular formula of the hydrated salt will be X.3H₂O
Learn more about hydrated salts at: https://brainly.com/question/14447094
#SPJ1
In the following take CV = 20.8 and CP = 29.1 J⋅mol−1⋅°C−1 for nitrogen gas: (a) Three moles of nitrogen at 30°C, contained in a rigid vessel, is heated to 250°C. How much heat is required if the vessel has a negligible heat capacity? If the vessel weighs 100 kg and has a heat capacity of 0.5 kJ⋅kg−1⋅°C−1, how much heat is required? (b) Four moles of nitrogen at 200°C is contained in a piston/cylinder arrangement. How much heat must be extracted from this system, which is kept at constant pressure, to cool it to 40°C if the heat capacity of the piston and cylinder is neglected?
Answers
Answer:
\(224 \times 13313\frac{.131?}{?244} \)
Which portion of a molecule of F2O has partial positive charge?
Question 3 options:
A)
The F atoms
B)
The central O atom
C)
The partial charge on each atom is zero
D)
The partial charge on each atom is negative
Answers
The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B
The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.
Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.
In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.
Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.
Option B
For more such question on partial charges visit:
https://brainly.com/question/29974793
#SPJ8
Becca is a forensic technician analyzing the fragments of a window. She sees that there is a hole in the window, and that the outside hole is smaller than the inside hole. What might she deduce from this information?
Answers
The observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.
From the observation that the hole in the window is smaller on the outside than on the inside, Becca, as a forensic technician, might deduce the following:
The hole was caused by an impact from the outside: The smaller outside hole suggests that the force that created the hole originated from the outside and exerted more pressure on the window surface facing inward.
The object causing the hole was larger on the inside: The discrepancy in hole sizes implies that the object that struck the window had a larger size or diameter on the inside, and as it penetrated the glass, it compressed or fragmented the glass, resulting in a larger hole on the inside.
The object may have passed through the window: The difference in hole sizes indicates that the object may have penetrated the window, potentially passing through to the inside. This could suggest a break-in or an incident involving the window being struck from the outside.
Overall, the observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.
For more question on observation
https://brainly.com/question/29521469
#SPJ8
A 1.000 g sample of nitrogen combined with a 0.0720 g sample of hydrogen
to form N2H2. What compound is formed if 1.000 g of nitrogen combines
with 0.2160 g of hydrogen?
N2H6
NH3
NH4+
N4H4
Answers
Answer:
The answer is NH3.
Explanation:
The N2H2 (O hydrazine) is formed when from the synthesis of ammonia and hydrogen peroxide.
Or also formed when a 1,000g sample of nitrogen is combined with a 7.2 x10∧-2 sample of hydrogen.
0.2160 of hydrogen is 3 times 7.2 x10∧-2.
It means that the compound would look like:
N2H6.
But in chemistry, if there are divisible numbers in a compound, they must be divided:
NH3.
You want to plate a steel part having a surface area of 240 with a 0.002--thick layer of silver. The atomic mass of silver is 107.868 . The density of silver is 10.49 . How many atoms of silver are required
Answers
This question is incomplete, the complete question is;
You want to plate a steel part having a surface area of 240 in² with a 0.002-in thick layer of silver.
The atomic mass of silver is 107.868 g/mol .
The density of silver is 10.49 g/cm³.
How many atoms of silver are required?
Answer:
4.6 × 10²³ atoms of silver are required
Explanation:
Given the data in the question;
first, we determine the volume of silver layer
volume of silver layer = surface area × thickness
we substitute
volume of silver layer = 240 in² × 0.002-in = 0.48 in³
we know that 1 in³ = 16.387 cm³
so, volume of silver layer = 0.48 × 16.387 = 7.87 cm³
Next we calculate mass of silver;
⇒ density × Volume
mass of silver = 10.49 g/cm³ × 7.87 cm³ = 82.5563 g
Now, number of atoms of silver are required will be;
Number of atoms = (mass/atomic mass) × Avogadro number
we know that A.v no. is 6.02214 × 10²³ mol⁻¹
so
Number of atoms = (82.5563 g / 107.868 g/mol . ) × 6.02214 × 10²³ mol⁻¹
= 0.7653 × 6.02214 × 10²³
= 4.6 × 10²³ atoms
Therefore; 4.6 × 10²³ atoms of silver are required
What happens to the amount of solution when we add food colour to it?
Answers
Answer:
We need more? What else is in the question? This is unanswerable.
Explanation:
7. Describe the propert 1 lies of hard and soft materials
Answers
The properties of hard and soft materials refer to their physical characteristics and behaviors.
These properties are related to factors such as the arrangement of molecules, bonding strength, and response to external forces. Here, we will discuss the general properties of hard and soft materials.
Hard materials:
Rigidity: Hard materials exhibit high stiffness and resist deformation under applied forces. They tend to maintain their shape and structure.
High strength: Hard materials have strong intermolecular or intramolecular forces, allowing them to withstand high stress and pressure without breaking or deforming.
High melting and boiling points: Hard materials often have high melting and boiling points due to the strong bonds between their atoms or molecules.
Brittle: Hard materials are often brittle, meaning they have low tolerance to tensile or bending forces and are prone to fracturing or shattering instead of deforming.
Low compressibility: Hard materials have low compressibility, meaning they do not easily compress or change volume under pressure.
Soft materials:
Flexibility: Soft materials are pliable and easily deformable under applied forces. They can be bent, stretched, or compressed without breaking.
Low strength: Soft materials have weak intermolecular or intramolecular forces, making them more susceptible to deformation or damage under stress.
Low melting and boiling points: Soft materials generally have lower melting and boiling points compared to hard materials.
Ductile: Soft materials are often ductile, meaning they can be drawn into thin wires or stretched into thin sheets without fracturing.
High compressibility: Soft materials can be easily compressed or change volume under pressure due to their loosely packed molecular structures.
It's important to note that these properties are generalizations, and there can be variations within each category. Some materials may exhibit properties that fall between hard and soft, or they may have unique combinations of properties. Materials' properties play a crucial role in various applications, as they determine their suitability for specific uses such as construction, manufacturing, and design.
Know more about soft materials here:
https://brainly.in/question/9463325
#SPJ11
Gather all of your pennies dated before 1982. Then follow the steps to complete the table. Include units as
necessary.
1. Record the number of pennies dated before 1982.
2. Weigh (as a group) the pennies dated before 1982. Record the total mass. If you're unfamiliar with using an
electronic balance, watch this video before continuing.
3. Calculate and record the average mass of a single penny. If you need help with the calculation, visit the
averaging data section of the math review .
Answers
Prior to 1982, penny dates' history
Years weight (Mass)
\(1793-95\) \($13.48 \mathrm{gm}$\)
\($1795-1857$\) \($10.89 \mathrm{gm}$\)
\($1856-1864$\) \($4.67 \mathrm{gm}$\)
\($1864-1942$\) \($3 \cdot 11 \mathrm{gm}$\)
\(1943$\\\) \($2.72 \mathrm{gm}$\)
\($1944-46 \quad\) \(3.11 \mathrm{gm}$\)
\($1947-62$\) \($3 \cdot 11 \mathrm{gm}\)
\($1962-82 \quad\) \(3.11 \mathrm{gm}$\)
How many pennies are post-1982 in number
Years weight (Mass)
\(1982 - present $\quad\) \(2.5 \mathrm{gm}$\)
Then,
(C) Total no. of pennies =( No. g pennies duted before 1982)
+(No.g pernies duted after 1982) \($=(8+1)$\)
Total no. of Pennies =9
Over the past ten years, the cost of copper has more than doubled. Therefore, depending on the metal it contains, a penny made before 1982 is worth 2.2 cents. The U.S. Mint banned the melting down of pennies for financial gain in 2007.
Learn more abut penny https://brainly.com/question/15553018
#SPJ9
Starting with 0.3500 mol CO(g) and 0.05500 mol COCl2(g) in a 3.050 L flask at 668 K, how many moles of CI2(g) will be present at equilibrium?
CO(g) + Cl2(g)》COCl2(g)
Kc= 1.2 x 10^3 at 668 K
Answers
At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.
1: Write the balanced chemical equation:
\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)
2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.
Initial:
\(C_O\)(g) = 0.3500 mol
\(Cl_2\)(g) = 0.05500 mol
\(C_OCl_2\)(g) = 0 mol
Change:
\(C_O\)(g) = -x
\(Cl_2\)(g) = -x
\(C_OCl_2\)(g) = +x
Equilibrium:
\(C_O\)(g) = 0.3500 - x mol
\(Cl_2\)(g) = 0.05500 - x mol
\(C_OCl_2\)(g) = x mol
3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:
Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]
4: Substitute the given equilibrium constant (Kc) value into the expression:
1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)
5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:
1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x
6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.
7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.
8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):
\(Cl_2\)(g) = 0.05500 - x
9: Calculate the value of \(Cl_2\)(g) at equilibrium:
\(Cl_2\)(g) = 0.05500 - x
\(Cl_2\)(g) = 0.05500 - (positive value of x)
10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.
Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.
For more such questions on equilibrium, click on:
https://brainly.com/question/517289
#SPJ8
CHEMISTRY HELP!
Can anyone help me understand or explain why my answer was wrong and why the correct answer is right? Please help!
Answers
Answer:
Li to Zn2+
Explanation:
Because oxidation number of Li changes from 0 to 2+ it means that Li has lost two electrons and oxidation number of Zn2+ changes to Zn which means Zn received two electrons.
Why do atoms connect to eachother?
Answers
Answer:
To keep from falling apart
Explanation:
Write a description of your dream car by using powerful adjectives. Write about 100-120 words
Answers
Answer:
It was a cold December night shortly after dusk, a likely setting for an event that would prove to be life altering. As fate would have it, this would be the night that I lost the material possession that truly meant the most to me. I would lose the one thing that gave me much pride and joy and excitement. I often think back and liken us to a newlywed couple, for we had only been together for 18 months and were still very much honeymooning. It was a night, a moment, that even now scoffs and mocks me as I travel thither and yonder with her replacement. But she can never be truly replaced and to call my current fix a replacement seems like a sort of blasphemy.
I called her my Blue Angel. That's right! She was a brand new 1999 Atlantic blue Ford Mustang fully equipped with white racing stripes on each side, dark window tint, a rear spoiler, and a post-factory sound system that I installed personally just to complete the "dream ride" effect. We met on April 24, 1999,when my parents introduced us and told me she was all mine as a reward for graduating high school as valedictorian. And what a reward she turned out to be. We went everywhere together. I took her out to eat. When I'd go play ball somewhere, she went with me. Every day from April 24, 1999, to December 22, 2000, we were together. We were bonding in a way a young man can bond with no other, and there truly was no other for me. Other guys had bigger trucks and faster cars, but where my Blue Angel was lacking in size and power, she more than made up for in pure, unadulterated, raw emotion, She never let me down; she was always looking her best and never longing for attention from me or any of the other countless admirers and fans she won over for...
Explanation:
What system is used to help match DNA from crime scenes to a DNA database?
A.
CODIS
B.
AFIS
C.
NIBIN
D.
FBI
Answers
Answer:
A. CODIS
Explanation:
The Combined DNA Index System (CODIS), administered by the FBI, maintains DNA profiles obtained through federal, state, and local DNA sample collection programs, and makes this information available to law enforcement agencies across the country for law enforcement identification purposes.
hdjfkajk djhaffg fudhfkas
Answers
Why is blood considered a suspension?
Answers
Answer:
Because platelets and other things are "suspended" in the plasma.
Explanation:
When blood is put into a centrifuge it separates into its separate components (eg: Red blood cells, plasma, White blood cells, platelets, etc)
The chemical reaction represented as “AB ⇒ A + B” is a ______
Answers
Answer:
Below
Explanation:
This would be a decomposition reaction. This occurs when a compound breaks down into 2 + simpler substances. We can see this from AB --> A + B, one compound (AB) breaks down into 2 simple substances ( A and B ).
Hope that helped!
if 72.3g of oxygen react with hydrogen, how many grams of water will be produced
Answers
When elements bond together or when bonds of compounds are broken and form a new substance
A. Fireworks
B. Chemical Reaction
C. Chemical Change
D. Energy
Answers
Find the SDS for regular bleach
Answers
The Safety Data Sheet (SDS) for regular bleach can be obtained from the manufacturer or supplier of the specific brand or product. It contains important information regarding the hazardous properties, handling, storage, and emergency procedures related to the bleach.
An SDS typically includes details such as the product's chemical composition, physical and chemical properties, potential hazards to health and the environment, precautionary measures for safe handling and storage, first-aid procedures, and information about proper disposal. It also provides guidance on personal protective equipment (PPE) to be used when handling the product and steps to take in case of accidental release or exposure.
The SDS serves as a crucial resource for understanding the potential risks associated with the use of regular bleach and helps ensure that appropriate safety measures are implemented. It is important to review and follow the information provided in the SDS to minimize the risk of accidents, injuries, or adverse health effects associated with the use of the product.
for such more questions on product
https://brainly.com/question/30667391
#SPJ8
The reactions in the table are all zero order and follow the same general reaction process of A →
Half-life, 1/2 (s)
3.91
Reaction 1
Rate constant, & (M-s-¹)
0.0471
0.0731
Reaction 2
?
Reaction 3
6.91
?
Reaction 4
4.31
0.0391
Reaction 5
4.31
?
Calculate the missing values for half-life (11/2), rate constant (k), and initial concentration, [A]o.
Macmillan Learning
reaction 1 initial concentration, [A]o:
reaction 3 rate constant, k:
reaction 5 rate constant, k:
M
products.
Initial concentration, [A]o (M)
?
0.791
0.631
?
0.891
M.SI
reaction 2 half-life, 11/2:
M.s-1 reaction 4 initial concentration, [A]o:
S
M
Answers
The zero order reaction's rate law is [A] = [4]. -K+ 1 Where [A] = Initial reactant concentration Order rate rate constant is K. At time t, [A] represents the reactant's concentration. At ty₂, [A] = [Ao] 2[A] - [A] = - K-
What do you mean by response?the procedure, event, or act of reacting. opposing or resisting a force, movement, or influence. Particularly: a propensity for an old, typically antiquated political or social structure or policy; a reaction to a given treatment, circumstance, or stimulus.
What exactly is a physical response?A physical reaction is one in which molecules rearrange themselves but do not undergo any chemical changes. Without a change in composition, physical responses can result in changes to the texture, size, temperature, and state.
To know more about reaction visit:
https://brainly.com/question/30115256
#SPJ1
Record your data either in your lab notebook or in the space below.
Step
Material
Change(s) Observed
Type of Change (Physical/Chemical)
Reasoning
2
Calcium carbonate
3
Calcium carbonate and hydrochloric acid
4
Water
5
Copper sulfate
Pentahydrate
6
Iron filings and sulfur
7
Lead nitrate and potassium iodide
8
Magnesium and hydrochloric acid
9
Candle
Answers
Review and analyze the data recorded during the experiment to draw conclusions and better understand the types of physical and chemical changes that occurred.
Step 1: Organize your data in a table format in your lab notebook or the space provided.
Step 2: Record the initial material, Calcium carbonate.
Step 3: When Calcium carbonate reacts with hydrochloric acid, the changes observed would be the formation of bubbles and fizzing. This is a chemical change due to the formation of a new substance, calcium chloride, and the release of carbon dioxide gas.
Step 4: For water, there is no reaction observed. This step represents a physical change, as water does not alter the chemical composition of the other materials.
Step 5: When Copper sulfate pentahydrate is added to water, the change observed is the dissolution of the solid into the water, forming a blue solution. This is a physical change because the chemical composition of the copper sulfate remains the same.
Step 6: When Iron filings and sulfur are mixed together, no observable change occurs. This is a physical change since the individual substances are not chemically reacting.
Step 7: When Lead nitrate reacts with potassium iodide, a yellow precipitate (Lead iodide) forms. This is a chemical change due to the formation of new substances.
Step 8: When Magnesium reacts with hydrochloric acid, the change observed is the formation of bubbles and the disappearance of the magnesium. This is a chemical change due to the formation of magnesium chloride and the release of hydrogen gas.
Step 9: When a candle is burned, the change observed is the flame and the production of heat and light. This is a chemical change as new substances are formed, such as carbon dioxide and water vapor.
Remember to review and analyze the data recorded during the experiment to draw conclusions and better understand the types of changes (physical or chemical) that occurred.
For more such questions on chemical changes , Visit:
https://brainly.com/question/1222323
#SPJ11
Amylase is the enzyme that controls the breakdown of starch to glucose. Describe how the student could investigate the effect of pH on the breakdown of starch by amylase.
Answers
Answer:
Explanation:
You will investigate the breakdown of starch by amylase at different pHs.
The different pHs under investigation will be produced using buffer solutions. Buffer solutions produce a particular pH, and will maintain it if other substances are added.
The amylase will break down the starch.
A series of test tubes containing a mixture of starch and amylase is set up at different pHs.
A sample is removed from the test tubes every 10 seconds to test for the presence of starch. Iodine solution will turn a blue/black colour when starch is present, so when all the starch is broken down, a blue-black colour is no longer produced. The iodine solution will remain orange-brown.
A control experiment must be set up - without the amylase - to make sure that the starch would not break down anyway, in the absence of an enzyme. The result of the control experiment must be negative - the colour must remain blue-black - for results with the enzyme to be valid.
When the starch solution is added:
Start timing immediately.Remove a sample immediately and test it with iodine solution.Sample the starch-amylase mixture continuously, for example every 10 seconds.For each pH investigated, record the time taken for the disappearance of starch, ie when the iodine solution in the spotting tile remains orange-brown.
The time taken for the disappearance of starch is not the rate of reaction.
It will give us an indication of the rate, but is the inverse of the rate - the shorter the time taken, the greater the rate of the reaction.
We can calculate the rate of the reaction by calculating \frac{1}{t}, obtaining a measure of the rate of reaction by dividing one by the time taken for the reaction to occur.
A similar experiment can be carried out to investigate the effect of temperature on amylase activity.
Set up a series of test tubes in the same way and maintain these at different temperatures using a water bath - either electrical or a heated beaker of water.
Depending on the chemical reaction under investigation, you might monitor the reaction in a different way. If investigating the effect of temperature on the breakdown of lipid by lipase, you could monitor pH change - lipids are broken down into fatty acids and glycerol. As the reaction begins, the release of fatty acids will mean that the pH will decrease.
good luck :)
calculate the relative formula mass of copper oxide if O=16 and Cu=64
Answers
Copper oxide, CuO has a relative formula mass of 80.
What is the Relative Formula mass?
This refers to the total of the relative atomic masses of the atoms in the numbers seen in the formula.
What is Relative Atomic mass?This refers to the relative mass of atoms when compared with the carbon-12 atoms Ar. Relative formula mass is a measure of relative mass, thus it has no unit.
Calculating Relative Formular mass?Solve for the number of atoms each element presents in the chemical formula. Sum the Relative atomic values for all the atoms present. From the question:O=16 and Cu=64
copper oxide, CuO= (1 * 64) + (1 * 16)
= 64 + 16
=80
Where,
1 = The subscript value of the element present.
Learn more about Relative Formular mass on
https://brainly.com/question/10632827
#SPJ1
Which is the correct statement regarding the relative Rf values of the starting methyl benzoate vs the product, methyl m-nitrobenzoate on a silica gel TLC plate. The product has a higher Rf value on a silica gel TLC plate because it is less polar than the starting methyl benzoate. The product has a lower Rf value on a silica gel TLC plate because it is less polar than the starting methyl benzoate. The product has a higher Rf value on a silica gel TLC plate because it is more polar than the starting methyl benzoate. The product has a lower Rf value on a silica gel TLC plate because it is more polar than the starting methyl benzoate. 1.5 points QUESTION 2 Methyl benzoate is more reactive than benzene in Electrophilic Aromatic Substition [EAS] reactions. True False 1 points QUESTION 3 Methyl m-nitrobenzoate is less reactive than methyl benzoate in Electrophilic Aromatic Substition [EAS] reactions. True False
Answers
Answer:
1. The product has a higher Rf value on a silica gel TLC plate because it is more polar than the starting methyl benzoate.
2. False
3. True
Explanation:
In chromatography, there is a stationary phase and a mobile phase. The ratio of the distance moved by a component and the distance moved by the solvent gives the retention factor (Rf).
Since silica gel is a polar solvent, it will retain the more polar product methyl m-nitrobenzoate compared to the methyl benzoate starting material.
In comparing the electrophillic aromatic substitution of m-nitrobenzoate and methyl benzoate, we must remember that the presence of electron withdrawing groups (such as -NO2 and -CHO) on the aromatic compound deactivates the compound towards electrophillic aromatic substitution hence, methyl m-nitrobenzoate is less reactive than methyl benzoate in Electrophilic Aromatic Substition and Methyl benzoate is less reactive than benzene in Electrophilic Aromatic Substition
The final result has a higher Rf value because the TLC plate has more polarity than the other compound.
The answer to the following question is as follows:-
False True
In chromatography, it is a process that is used to separate the different components on the basis of their votality. The ratio of the distance moved by a component and the distance moved by the solvent gives the retention factor (Rf).
In comparing the electrophilic aromatic substitution of m-nitrobenzoate and methyl benzoate, we must remember that the presence of electron-withdrawing groups on the aromatic compound deactivates.
The compound towards electrophilic aromatic substitution hence, methyl m-nitrobenzoate is less reactive than methyl benzoate in Electrophilic Aromatic Substitution and Methyl benzoate is less reactive than benzene in Electrophilic Aromatic Substitution.
For more information, refer to the link:-
https://brainly.com/question/15804584