Answers
The main difference between practical work inside and outside a laboratory is the environment and tools used for experimentation.
Practical work inside and outside the laboratoryInside a laboratory, experiments are conducted in a controlled environment with specialized equipment and instruments designed to facilitate experimentation, record data, and ensure safety.
On the other hand, outside the laboratory, experiments are often conducted in a less controlled environment, which can make it more challenging to control variables and obtain accurate results.
Also, experiments outside the laboratory often require different tools and techniques to account for environmental factors such as weather conditions. However, outside the laboratory, there is often more opportunity for real-world applications of experimental findings.
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Related Questions
What is Tiny grains that contain sperm call
Answers
Answer:
Pollen
Explanation:
Pollen is a powdery substance consisting of pollen grains which are male microgametophytes of seed plants, which produce male gametes (sperm cells).
Help I’m not sure what to do
Answers
There are eight diastereomers of 1,2,3,4,5,6-hexachlorocyclohexane. One of them is drawn. Draw the other seven in the cyclohexane framework below (5 points). One isomer loses HCl in an E2 reaction nearly 1000 times more slowly than the others. Circle the isomer that reacts so slowly, draw its corresponding chair conformers and explain the reason for the slow rate. (5 points).
Answers
Answer:
Attached below diagram of the eight diastereomers
The Isomer that reacts so slowly is DIASTEREOMER 8
Explanation:
The Isomer that reacts so slowly is DIASTEREOMER 8 in an E2 reaction and this is because no pair of chlorine and hydrogen atoms can assume the anti-periplanar orientation that is preferred in an E2 elimination
attached below is Diagram of the eight diastereomers ( screen shot from my drawing tool )
I need help calculating the error % in molar mass
Answers
Error % = |(experimental - actual) / actual| x 100%
For example, let's say the actual molar mass of a compound is 100 g/mol, and the experimental molar mass determined in the lab is 95 g/mol. The error percentage would be:
Error % = |(95 - 100) / 100| x 100%
Error % = |-0.05| x 100%
Error % = 5%
Therefore, the error percentage in molar mass is 5%
A sample of a certain lead compound contains 12.92 g of lead for 2 g of oxygen. A second sample has mass of 34.27 g and contains 14.39 g of oxygen. Are the two compound the same
Answers
The two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.
What is a chemical compound?A chemical compound is a substance made of numerous similar molecules (or molecular entities) joined by chemical bonds and comprising atoms from various chemical elements. Therefore, a molecule made up of only one type of atom is not a compound. Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be broken or new ones created during this process.
What are the calculations?sample 1 = mass of lead / mass of oxygen = 12.92g/2g = 6.46 .
sample 2 = mass of lead/ mass of oxygen = 34.27 - 14.39/14.39 = 1.38 .
so, the ratios are not the same.
Hence, the two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.
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For the reaction
4PH3(g)↽−−⇀6H2(g)+P4(g)
the equilibrium concentrations were found to be [PH3]=0.250 M, [H2]=0.580 M, and [P4]=0.750 M.
What is the equilibrium constant for this reaction?
c=
Answers
The equilibrium constant (Kc) for the given reaction is approximately 16.448. The value of Kc indicates the relative concentrations of reactants and products at equilibrium. In this case, a Kc greater than 1 suggests that the products (H2 and P4) are favored at equilibrium, indicating that the forward reaction is more favorable.
To determine the equilibrium constant (Kc) for the given reaction:
4PH3(g) ↔ 6H2(g) + P4(g)
We can write the equilibrium constant expression based on the stoichiometric coefficients:
Kc = ([H2]^6 * [P4]) / ([PH3]^4)
Substituting the given equilibrium concentrations:
[PH3] = 0.250 M
[H2] = 0.580 M
[P4] = 0.750 M
We can plug in these values into the equilibrium constant expression:
Kc = ([0.580]^6 * [0.750]) / ([0.250]^4)
Kc = (0.0860128 * 0.750) / (0.00390625)
Kc = 16.448
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11
6 points
What polyatomic ion could form a neutral compound with the manganese (VII) ion? (6 points)
AND
include the following in your answer:
polyatomic anion formula AND name
name of the neutral compound
formula of the neutral compound
Answers
Answer:
Explanation:
Manganese (VII) ion (an anion) has the formula MnO₄⁻. A polyatomic ion is an ion that is made up of more than one atom. For example, MnO₄⁻ and NH₄⁺. Since the ion provided in the question is an anion, the polyatomic ion that would react with it will have to be a cation (positively charged).
The polyatomic cation that will react with MnO₄⁻ to form a neutral compound is NH₄⁺ (ammonium ion) to form NH₄MnO₄ (Ammonium permanganate).
Which diagram correctly describes the changes that occur as a small piece of rock falls from space and hits the earth
Answers
Answer:
the motion of gravity
Explanation:
Answer:
its c
Explanation
advhuosijoklxcmnjdabsuhggggabciaciudeifweingivg eygerigsygfe97rsghisdcvhbsduigwiugfu9uigdgiurfgyisdgfsdgfegiygewifgsdygfewusgfuyesigf7wgfiesgfiusgdfies
What do scientists think is the
reason the mollusks have been so
successful through time?
B
Answers
Answer: Body plans change as new challenges arise.
Explanation:
The mollusks are the invertebrate animals. They live marine environment. They live in shallow waters. They have been found in variety of marine habitats so this indicates their adaptiveness to different conditions. They have body plan that comprises of shell, mantle, radula and muscular foot that helps in survival and adaptation in different conditions. The shell and mantle are hard structures which protect these animals from predators and also help them to camouflage. Also the muscular foot helps in locomotion. Radula helps in feeding. Oysters, snails are some examples of mollusks.
11. What is deceleration also called?
negative velocity
negative acceleration
negative speed
positive stopping
Answers
Explanation:
it is negative acceleration
Answer:
negative acceleration
Explanation:
I need help with two question below.
Answers
Answer:
1, u-92
2, 237-92=145
Explanation:
the isotopes means the element which have the same number of proton, but different neutron
92 is the atomic number
so the atomic number =proton number
so mass= neutron+ proton
shift the place and u will get this
neutron= mass -proton
A 25 ml solution of 0.5 M NaOH is titrated until neutralized into a 50 ml sample of HCl?
Answers
The concentration of the acid is \(0.25 M\).
Titration is a laboratory technique used to determine the concentration of a substance in a solution by reacting it with a standardized solution of known concentration.
The titration formula can be given by,
(Volume of the Base) \(\times\) (Normality of the Base) = (Volume of the Acid) \(\times\) (Normality of the Acid)
\(\Rightarrow V_1N_1=V_2N_2\)
Given, the volume of the base (\(NaOH\)), \(V_1 =25 ml\).
The concentration of the base (\(NaOH\)), \(M_1=0.5 M\).
The equivalence of the base (\(NaOH\)) is \(1\).
Hence, the normality of the base (\(NaOH\)), \(N_1=\frac{0.5}{1}N=0.5N\).
Given, the volume of the acid (\(HCl\)), \(V_2 =50 ml\).
Let us assume that the normality of the acid (\(HCl\)) \(N_2\).
Substitute the values in the given formula of titration.
\((25\times0.5)=(50 \times N_2)\\\Rightarrow 12.5=50N_2\\\Rightarrow N_2=\frac{12.5}{50} N\\\Rightarrow N_2=0.25 N\)
Hence, the normality of the acid (\(HCl\)), \(N_2=0.25 N\).
The equivalence of the acid (\(HCl\)) is \(1\).
Therefore, the concentration of the acid, \(M_1=\frac{0.25}{1}=0.25 M\).
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When an atom goes through alpha decay,
a. Only the atomic number changes
b. Only the mass number changes
c. Both the mass and atomic numbers change
d. Neither the mass nor atomic number changes, as only energy is emitted.
Answers
Question 4 (4 points)
(01.03 MC)
An energy transformation flow diagram is shown.
X-
ELECTRICAL
ENERGY
What type of energy does X most likely represent? (4 points)
O a
X = gravitational energy
Oь
X = mechanical energy
Ос
= thermal energy
Od
X = radiant energy
Answers
Answer:
I think radiant I’m not sure
Explanation:
A solution is prepared by mixing 2.50g of CaCl2 with 50.0g H2O, what is the mass percent of CaCl2?
A. 3.76%
B. 4.76%
C. 5.76%
D. 6.76%
Answers
How many molecules are in 82.93 moles of N205?
Answers
Answer:
2.41 molecules.
Explanation:
hope this helps!
conclusion about filter press
Answers
Answer: A filter press is an efficient and economical machine for liquid/solid separation. ... The Slury – in a filter press operation the slurry is pumped into the chamber and against the filter media. The Filtrate – the liquid passes through the filter cloth and exits via the filter plate's filtrate ports.
Hope this helps... Stat safe and have a great day...
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.
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What does Newton’s first law of motion state?
Answers
Answer:
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia. ... If that velocity is zero, then the object remains at rest.
Explanation:
Answer:
Before Galileo and Newton, many people thought that objects lost speed because they had a built-in natural tendency to do so. But those people weren't taking into account the multiple forces here on Earth - for example, friction, gravity, and air resistance - that cause objects to change their speed. If we could see the motion of an object in deep interstellar space, we would be able to observe the natural tendencies of an object that is free from any external influence. In deep interstellar space we would observe that if an object had a speed, it would continue to move with that speed until there was some force causing a change in its motion. Likewise, if an object were at rest in interstellar space, it would remain at rest until there was a force causing a change in its motion.
Explanation:
Hope it helped you =)
What is the main product of cellular respiration which cells need for energy?
sunlight
ATP
carbon dioxide
ACP
Answers
Answer:
ATP
Explanation :
Because the energy is released during the process of glycolysis in cellular respiration and then the molecule is captured by the energy carrying molecule which is the ATP (adenosine triphosphate).
What is the molality of 6 grams of salt in 10 grams of solution?
Answers
Answer:
maalat ang salt
Explanation:
If [H3O^ + ]=1.7*10^ -8 M what is the pOH of the solution?
Answers
Answer: 6.23
Explanation:
1) solve for pH
pH=-log (H3O+) = - log 1.7 X 10^-8 =7.77
2) now do 14-pH = 14 -7.77=6.23
When 1.550 gg of liquid hexane (C6H14)(C6H14) undergoes combustion in a bomb calorimeter, the temperature rises from 25.87 ∘C∘C to 38.13 ∘C∘C. Find ΔErxnΔErxn for the reaction in kJ/molkJ/mol hexane. The heat capacity of the bomb calorimeter, determined in a separate experiment, is 5.73 kJ/∘CkJ/∘C.
Answers
Answer:
ΔErxn\(= -3.90*10^3KJ\)
Explanation:
Given from the question
T1 = 25.87∘C
T2= 38.13∘C.
C= 5.73Kj/C
CHECK THE ATTACHMENT FOR DETAILED EXPLATION
An object is fired vertically upward with an initial velocity v(0) v from an initial position s(0) sn. Answer parts a and b below. a. For vo 68.6 m/s and so 30 m, find the position and velocity functions for all times at which the object is above the ground The velocity function is v(t) The position function is s(t) b. Find the time at which the highest point of the trajectory is reached and the height of the object at that time. The time at which the highest point of the trajectory is reached is at (Type an integer or a decimal.) The height of the object at the highest point of the trajectory is (Type an integer or a decimal.) S. m. Enter your answer in each of the answer boxes.
Answers
a. The position function when the initial velocity 68.6 m/s is s(t)=s0+v0t-1/2gt2.
b. The highest point is 151.2m.
a. the velocity and position functions for an object fired vertically upward with an initial velocity of 68.6 m/s and an initial position of 30 m can be found using the equations v(t)=v0-gt and s(t)=s0+v0t-1/2gt2. Here, v0 is the initial velocity, s0 is the initial position, g is the acceleration due to gravity (9.8 m/s2), and t is time.
b. the time at which the highest point of the trajectory is reached can be found by setting the velocity to 0 and solving for t in the equation v(t)=v0-gt. This yields a time of t=v0/g. For the given initial velocity of 68.6 m/s, this yields t=6.97 s. The height of the object at the highest point of the trajectory is found by substituting t into the equation s(t)=s0+v0t-1/2gt2. For the given initial position of 30 m and initial velocity of 68.6 m/s, this yields s(6.97) = 30+68.6*6.97-1/2*9.8*6.97^2 = 151.2 m.
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What is the percent composition of Iron (II) Phosphate
Answers
Answer:
The percent composition of Iron (II) Phosphate is
Fe = 46.866%
P = 17.330%
O = 35.806%
The percent composition of compounds is obtained form the mass of atoms in the compounds.
The formula of Iron (II) Phosphate is Fe3(PO4)2. We now have to obtain the molar mass of the compound as follows;
Molar mass = 3(56) + 2[31 + 4(16)] = 168 + 190 = 358 g/mol
Percentage of iron = 3(56)/358 × 100/1 = 46.9%
Percentage of phosphorus = 2(3)1/358 × 100/1 = 17.3%
Percentage of oxygen = 8(16)/358 × 100/1 = 35.8 %
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A student measures out exactly 0.1090
g of salicylic acid and carries out an aspirin synthesis using salicylic acid, acetic anhydride, heat, and an acid catalyst. Salicylic acid is the limiting reagent in this reaction, which yields 0.1000g of aspirin. What is the percent yield for the reaction?
Answers
The percent yield of aspirin in this reaction is 71.1%.
What is Percentage Yield?
Percentage yield is a measure of the efficiency of a chemical reaction, expressed as a percentage. It is calculated by dividing the actual yield of the desired product by the theoretical yield (the maximum amount of product that can be produced from the given amounts of reactants) and multiplying the result by 100%.
The balanced chemical equation for the reaction is:
C7H6O3 + C4H6O3 → C9H8O4 + C2H4O2
The molar mass of salicylic acid is 138.12 g/mol and the molar mass of aspirin is 180.16 g/mol.
First, we need to calculate the theoretical yield of aspirin:
1 mol salicylic acid = 1 mol aspirin
0.1090 g salicylic acid * (1 mol / 138.12 g) * (1 mol / 1 mol) * (180.16 g / 1 mol) = 0.1405 g aspirin (theoretical yield)
The percent yield is calculated by dividing the actual yield by the theoretical yield and multiplying by 100:
Percent yield = (actual yield / theoretical yield) x 100
Percent yield = (0.1000 g / 0.1405 g) x 100
Percent yield = 71.1%
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Explain ocean currents and how density differences between HOT/COLD and SALT/FRESH affect them.
-for science
Answers
Density differences caused by temperature and salinity variations are fundamental drivers of ocean currents of seawater . Warm currents transport heat from the equator to higher latitudes, while cold currents transport cold water from higher latitudes to lower latitudes.
When seawater is heated, it expands and becomes less dense, causing it to rise. Conversely, when seawater cools, it contracts and becomes denser, causing it to sink. These density differences due to temperature variations create vertical movements in the ocean known as thermohaline circulation or convection currents. On the other hand, regions with high freshwater input from rivers or heavy precipitation have lower salinity, resulting in lower density. This lighter water tends to float on the denser seawater beneath it, leading to the formation of surface currents that transport water from areas of low salinity to areas of higher salinity. These ocean currents play a vital role in shaping global climate patterns and maintaining the balance of heat and nutrients in the ocean ecosystem.
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student conducted a simple experiment to explore heat transfer they constructed the closed system you see here a metal soda can inside a styrofoam cup the metal can was filled with an 80° c cup of water and placed into the cell phone called containing colder water at 10° cthe students predicted that the water in the middle can would decrease in temperature while the water temperature inside the cup would increase based on the student data recorder and the data table the prediction was correct explain how to transfer heat energy occurred select all the statements that could apply
Answers
Answer: its all A,B,C, and D
Explanation:i got it right on usa test prep lol
Why starch peanut doesn't dissolve in acetone
Answers
Peanut doesn't dissolve in acetone because the crosslinking structure of polystyrene can be broken down in some organic solvents such as acetone.
What is acetone?
Acetone, is described as an organic compound with the formula (CH₃)₂CO which is the simplest and smallest ketone.
Acetone is known to be colorless, highly volatile and flammable liquid with a characteristic pungent odor.
When the polystyrene peanuts are added to the acetone, they do not really dissolve in the acetone, but instead go through a process called “swelling” that allows the trapped gases to escape.
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Calculate the AH for the reaction C₂H4 (9) + H₂ (9)→ C₂H6 (g), from the following:
a. C₂H4 (g) + 3 O₂ (g) → 2 CO₂ (g) + 2 H₂O (1)
b. 2 C₂H6 (g) + 7 O₂ (g) → 4 CO₂ (g) + 6 H₂O (1)
c. 2 H₂ (g) + O₂ (g) → 2 H₂O (1)
AH = - 1411. KJ
AH = - 3120. KJ
AH = -571.6 kJ
Answers
The AH for the reaction is -137 kJ
What is Enthalpy of Formation ?Enthalpy of formation is the energy required by reactants to convert into products . It value can be positive or negative depending on the type of reaction, Endothermic or Exothermic.
In the question 3 step reaction is given
C₂H4 (g) + 3 O₂ (g) → 2 CO₂ (g) + 2 H₂O (1) AH = - 1411. KJ
2 C₂H6 (g) + 7 O₂ (g) → 4 CO₂ (g) + 6 H₂O (1) AH = - 3120. KJ
2 H₂ (g) + O₂ (g) → 2 H₂O (1) AH = -571.6 kJ
To determine the enthalpy of formation for
C₂H4 (9) + H₂ (9)→ C₂H6 (g)
Adding reaction 1 and (1/2) 3 will give
C₂H4 (g) + 7/2 O₂ (g) + H₂ (g) ----> 2 CO₂ (g) + 3H₂O AH = -1696.8
For the second reaction
We will reverse the reaction and multiply it by 1/2
2 CO₂ (g) + 3 H₂O (1) --> C₂H6 (g) + 7/2 O₂ (g) AH = +1560
Adding the two new reactions.
C₂H4 (9) + H₂ (9)→ C₂H6 (g) AH = -137 kJ
Therefore The AH for the reaction is -137 kJ
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