Answers
Related Questions
Select the correct answer.
How are ionic bonds formed?
A.
by the disintegration of one or more electrons
B.
by the sharing of one or more electrons between two atoms
C.
by the transfer of one or more electrons from one atom to another
D.
by the disintegration of one or more protons
Answers
Answer: b
Explanation:
Predict the products for the following reactions (there are TWO products)
Li(s) + KNO3 (aq) →
Options:
LI
LiNO3
KNO3
K
Li₂NO3
Li(NO3)2
Answers
An equation which obey the law of conservation of mass is defined as the balanced chemical equation. According to law of conservation of mass, mass can neither be created nor be destroyed. The products are LiNO₃ and K. The correct options are B and D.
The substance which appears on the left hand side of the equation is defined as the reactants whereas the substance which are present on the right hand side are called products.
The reaction between 'Li' and KNO₃ is given as:
Li (s) + KNO₃ (aq) → LiNO₃ + K
Thus the correct options are B and D.
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What sample at STP has the same number of molecules as 5 L of NO2
Answers
Answer:
5l NO
2
at STP
No. of molecules=
22.4
5
mol=
22.4
5
×N
A
molecules
A) 5ℊ of H
2
(g)
No. of moles=
2
5
mol=
2
5
×N
A
molecules
B) 5l of CH
4
(g)
No. of moles of CH
4
=
22.4
5
mol=
22.4
5
N
A
molecules
C) 5 mol of O
2
=5N
A
O
2
molecules
D) 5×10
23
molecules of CO
2
(g)
Molecules of 5l NO
2
(g) at STP=5l of CH
4
(g) molecules at STP
Therefore, option B is correct.
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Does anyone know Chemistry
Answers
Answer:
so so
Explanation:
this your question?? <_>
A copper penny will sink in molten copper. What can you infer about the difference in distance between the molecules in a copper penny and in molten copper?
Answers
The molecules in a copper penny is closely packed and and has no space to move apart thus the material will be denser than that in the molten state. That's why the penny sink in the molten copper.
What is molten copper?Copper is a transition metal exhibiting all the metallic properties. The molten state of metals is the fluid state where the molecule are not strongly held by the metallic bonds.
Molten material is made by melting them and the liquid like state contains molecules with some space to move apart. Whereas, in solid state as in a copper penny, the molecules are closely packed and have no space to move apart.
An object will sink in a liquid if it is less dense than the liquid. Copper penny is denser than the molten copper because the molecules are densely packed and it will sink on to it.
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Which two statements about composite materials is true?
A. They're made up of more than one substance
B. They have the same or similar properties as the materials used to make them
C. They're always made of metal
D. They're readily available in nature
help as fast as u can please
Answers
What's galactose's empirical formula?
Answers
Answer:
C6H12O6
Explanation:
C6H12O6
Which phrase tells a major function of the endomembrane system?
Answers
Answer:
A major function of the Endomembrane system is
The endomembrane system (endo- = “within”) is a group of membranes and organelles in eukaryotic cells that works together to modify, package, and transport lipids and proteins.
Explanation:
The endomembrane system (endo = “within”) is a group of membranes and organelles (Figure 4.4. 1) in eukaryotic cells that works together to modify, package, and transport lipids and proteins. The endomembrane system is a series of compartments that work together to package, label, and ship proteins and molecules. In your cells, the endomembrane system is made up of both the endoplasmic reticulum and the Golgi apparatus. These compartments are folds of membranes that form tubes and sacs in your cells.
Hoped this helped! :D
I need help figuring it out the answers were wrong I put in
Answers
Which structure is the Lewis structure for ammonia (NH3)?
A.
A bond line structure of a compound has N H H H. The nitrogen has two dots at its bottom represents a lone pair of electrons.
B.
A bond line structure of a compound has H N H in the linear plane and hydrogen is branching upward, and the compound is H N (H) H.
C.
A bond line structure of a compound has H N H in linear plane and a hydrogen is branching upward, and the compound is H N (H) H. The nitrogen has two dots at its bottom represents a lone pair of electrons.
D.
A bond line structure of a compound has H N H H. The nitrogen has two dots on its top represents a lone pair of electrons.
Answers
Answer: **
H-N-H
|
H
Explanation:
Look at a periodic table to determine how many electrons you need to account for. Hydrogen (H) only has 1 electron, while Nitrogen (N) has 5. We have three Hydrogen atoms and one Nitrogen atom, so the total number of electrons will be 3 * 1 + 5 = 8 e-.
Now, place the center atom, which will be Nitrogen and place the three Hydrogens on three sides of it as above in the answer. You should use single bonds for this. Each single bond is a pair of electrons, so since we have three single bonds so far, we have accounted for 2 * 3 = 6 electrons. However, we need 2 more electrons for the total of 8. We put these electrons in as a lone pair above Nitrogen.
We check to see if everything follows the octet rule: Nitrogen has three single bonds, so that's 6 e-, as well as one lone pair, so that's another 2 e- for a total of 8 e-. Check. Now look at Hydrogen: H is the only element whose full orbital is 2 e-. Each H has a single bond with Nitrogen, so each does have 2 e-.
Thus, we know this is the correct diagram, and we are done.
Explanation:
A bond line structure of a compound has H N H in linear plane and a hydrogen is branching upward, and the compound is H N (H) H. The nitrogen has two dots at its bottom represents a lone pair of electrons. So ,the correct answer is option C.
The correct Lewis structure for ammonia (\(NH_3\)) is option C. It shows a bond line structure with three hydrogen atoms (H) bonded to a central nitrogen atom (N) in a linear plane.
One hydrogen atom branches upward from the plane. Additionally, the nitrogen atom in this structure has two dots at its bottom, indicating a lone pair of electrons. This arrangement follows the octet rule, as nitrogen has formed three covalent bonds with hydrogen, completing its valence shell. The lone pair on nitrogen gives ammonia its characteristic properties.
Thus, option C accurately represents the Lewis structure of ammonia, showing the bonding and lone pair arrangement of its atoms.
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Exercise 8 If 46.0g of CH₂ reacts with 32.0g O. According to the following reactio CH₂ + 20₂ - CO₂ + 2H₂O a. Which substance is limiting reactant? b. How many grams of it remain unreacted? c. How many grams of CO₂ would be produced?
Answers
Answer:
limiting reagent is 02
mass of CO2 is 11g
Explanation:
the limiting reagent is the reagent which is consumed completely
no of mole of CH2 = m in g / molar mass
= 46.0/(12+2)
= 3.285 moles.
no of mole of O2 = 32/32
= 1 mole
from the reaction
1 mole of CH2 ==> 2 mol of O2
3.285 mol ==> 1/2 mol
3.285 mol ==> 0.5 mol
:. since O2 has the lowest mol , it's the limiting reagent
the limiting reagent mol will be used to find the no of mole of CH2
2 mol of O2==> 1 mol of CO2
0.5 mol ==> 0.5/2
0.25 mole of CO2
mass = 0.25 * ( 12+32)
= 11g
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napisz wzory sumaryczne tlenków o podanych nazwach
Answers
Answer:
kingkongkabayo jahsgajavafhabavwh
A student requires 2.00 L of 0.100 M NH4NO3 from a 1.75 M NH4NO3 stock solution. What is the correct way to get the solution?
Use M subscript i V subscript 1 equals M subscript f V subscript f..
Measure 114 mL of the 1.75 M solution, and dilute it to 1.00 L.
Measure 114 mL of the 1.75 M solution, and dilute it to 2.00 L.
Measure 8.75 mL of the 1.75 M solution, and dilute it to 2.00 L.
Measure 8.75 mL of the 0.100 M solution, and dilute it to 2.00 L.
Answers
Answer:
I believe its B
Explanation:
Answer:
B. Measure 114 mL of the 1.75 M solution, and dilute it to 2.00 L.
What is rate of reaction?
Answers
Answer:
The reaction rate or rate of reaction is the speed at which a chemical reaction takes place. Reaction rate is defined as the speed at which reactants are converted into products. Reaction rates can vary dramatically.
Explanation:
PLS MAKE ME AS BRAINLIST
Compare atoms and molecules.
Answers
Answer: An atom is the sub-component of a molecule, or the smallest unit of matter. It is the smallest part an element can divide into. A molecule is made up of atoms that are bound by ionic, covalent or metallic bond.
Answer:
veryy help ful
Explanation:
An atom is the sub-component of a molecule, or the smallest unit of matter. It is the smallest part an element can divide into. A molecule is made up of atoms that are bound by ionic, covalent or metallic bond.
Which statement about the quantum mechanical solution for the hydrogen atom is INCORRECT?
Group of answer choices
A. The ms quantum number is always a fraction.
B. The principle quantum number, n, can have a value of 1.
C. The ml quantum number must have a positive value.
D. The angular momentum quantum number l = 1 corresponds to the p subshell.
Answers
Answer:
C. The ml quantum number must have a positive value.
Explanation:
The single electron in hydrogen can be found in a ground state orbital of 1s having a magnetic quantum number ml = 0.
Similarly, this one electron can be excited to other higher energy levels such as 2p, 3p, 3d etc
The magnetic quantum numbers ml for higher np sub-levels of the hydrogen atom have magnetic quantum numbers; -1, 0 and 1.
The nd sub-levels have magnetic quantum numbers; -2, -1, 0, 1, 2. We can see from the foregoing that magnetic quantum number ml for hydrogen atom is not always positive.
one member of each of the following sets of compounds is not isoelectronic with the others. which one in each set is the odd one out? a) [no2] , co2, [no2]-, [n3]-; b) [cn]-, n2, co, [no] , [o2]2-; c) [sif6]2-, [pf6]-, [alf6]3-, [brf6]-.
Answers
The process of gas effusion involves a hole, where the gas escapes. Lower molecular mass gases emit more quickly than greater molecular mass gases is( n2 and co )
The rate law demonstrates how the rate of a chemical reaction is influenced by the reactant concentration. The mathematical explanation provided by the Rate laws demonstrates how variations in a substance's amount can alter the rate of a chemical reaction.
The molecular mass is connected to the relative rates of effusion.
a) M(N₂)/M(O₂) = 28/32 = 0,875
b) M(N₂O)/M(NO₂) = 44/46 = 0,956
c) M(CO)/M(CO₂) = 28/44 = 0,636
d) M(NO₂)/M(N₂O₂) = 44/58= 0,758
e) M(CO)/M(N₂) = 28/28 = 1, CO and N₂ The equation for the elementary step is if the reaction takes place in the single elementary step, which is the three-body molecular collision. have inexact molecular masses and will effuse at nearly identical rates.
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10. When dissolved in water, most Group 1 metal salts can be described as
strong electrolytes.
strong acids.
weak electrolytes.
A
B
C
D
non-electrolytes.
(1)
Answers
When dissolved in water, most Group 1 metal salts can be described as strong electrolytes.
When Group 1 metal salts are dissolved in water, they can be described as strong electrolytes. This is because Group 1 metals, such as lithium (Li), sodium (Na), potassium (K), and so on, readily lose their outermost valence electron to form positive ions (cations). These cations then dissociate completely in water, separating from the anions to which they were originally bonded.
The dissociation of Group 1 metal salts in water results in the formation of positively charged metal ions and negatively charged non-metal ions (anions). These ions are free to move and conduct electric current, making the solution a good conductor of electricity. The complete dissociation of Group 1 metal salts in water and the presence of freely moving ions make them strong electrolytes.
Strong electrolytes are substances that ionize completely or almost completely in solution, producing a high concentration of ions. This is in contrast to weak electrolytes, which only partially ionize and produce a lower concentration of ions.
In summary, when Group 1 metal salts are dissolved in water, they form strong electrolytes due to their ability to dissociate completely into ions, leading to a high concentration of freely moving ions in the solution, thus enabling efficient electrical conductivity.
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before phase change: molecules move around each other 15. The medicine in the diagram above has molecules that are moving around each other. The doctor needs to slow down the molecules enough to cause a phase change. How will she do this, and how will this affect the medicine? I She transfers energy ... a into the medicine until it is a liquid. b) into the medicine until it is a gas. C out of the medicine until it is a solid. d out of the medicine until it is a liquid. LE 1 21 Illuminate Education, Inc.
Answers
Answer:
She transfers energy out of the medicine until it is solid. So the answer would be C.
Explanation:
According to the forces of attraction , molecules can be slowed down by moving out of the medicine until it is a solid , it will decrease the rate of absorption of medicine.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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How many atoms are there in two molecules of water?
a. 3
b.4
c.5
d.6
Answers
Answer:
the answer is 4
Explanation:
your welcome lol
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?
-Molecules in both the metal and the surrounding air will start moving at lower speeds. -Molecules in both the metal and the surrounding air will start moving at higher speeds. -The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
-The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Answers
Answer:
until the next harvest, and seed must be held for the next season's ... successful grain storage is the moisture content of the crop. ... or both. If ambient temperatures are low, then air alone may cool the ... allow some of the drying to take place naturally while the crop ... employed to cool grain that has been placed in storage.
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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Alkenes undergo an addition reaction with borane in tetrahydrofuran (THF).
For the reaction below:
((image))
Draw the structure of the major organic product.
Use the wedge/hash bond tools to indicate stereochemistry.
Use wedge and hash bonds ONLY when needed to show reaction stereochemistry.
If the reaction produces a racemic mixture, just draw one stereoisomer.
Answers
Alkyne chemistry refers to the branch of chemistry that deals with triple bonds between carbon atoms. Due to the presence of pi-electrons that are not tightly bound, alkynes undergo addition reactions.
Alkynes have a triple bond, which makes it possible to add halogens, water, and other substances to them through an addition reaction. A series of steps are used to create addition goods. The development of addition products is caused by the stability of vinylic cations. Asymmetric alkynes must adhere to Markovnikov's rule in order to conduct addition reaction. Below are a few addition reactions of alkynes that are explained: Alkenes are created when alkynes react with dihydrogen in the presence of catalysts like Pt/Pd/Ni. Alkanes are created when the produced alkenes further react with dihydrogen.
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Which substance can be classified as an Arrhenius acid
Answers
Answer:
HCl (Hydrochloric acid) can be classified as an Arrhenius acid.
Explanation:
An Arrhenius acid is a substance that donates hydrogen ions (H+) in an aqueous solution, resulting in an increase in the hydrogen ion concentration (pH). Examples of Arrhenius acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3).
Answer:
HCl (Hydrochloric acid)
Explanation:
Question 3 of 5
Which statement is a hypothesis?
A. If the temperature increases, then crickets will chirp more.
OB. Crickets are cooler than grasshoppers.
C. Does temperature affect how much crickets chirp?
OD. I hear crickets in the summer, so crickets chirp more when it's
warm outside.
SUBMIT
Answers
Answer:
A.) If the temperature increases, then crickets will chirp more.
Explanation:
The hypothesis is a testable statement that can be supported or disproved through experimentation.
A.) is correct. This statement clearly identifies what will (supposedly) happen when a variable is manipulated. Once an experiment is carried out, this hypothesis can be supported or negated.
B.) is incorrect. This is an opinion, not an objective statement. This statement is subjective and cannot be backed by evidence.
C.) is incorrect. Hypotheses are not questions. This statement also does not state how temperature could affect a cricket's chirp. However, questions can often lead to the formation of a hypothesis.
D.) is incorrect. The first part of the statement is an observation, and the second part is an assumption. Like in answer C, this information can be used as the basis in making a hypothesis.
determine the rate law and the value of k for the following reaction using the data provided. 2NO(g) + O2(g) -----> 2NO2
Answers
The rate law and the value of k for the given reaction is 1.7×103 M⁻²s⁻¹. Therefore, option D is correct.
What is rate law ?The word "rate law" refers to an expression that expresses reaction rate as the product of the stoichiometric coefficient of the reacting species in a balanced chemical equation multiplied by the molar concentration of the reactants, with each term raised to a power.
\(\rm Rate = k \times [NO]^{n} x [O_{2}]^ {m}\)
Thus, m must = 1
\(\rm Rate\ 1 = k \times [NO 1]^ {m} x [O_{2} 1]^ {n}\\Rate\ 2 = k \time [NO 2]^ {m} x [O_2 2]^ {n}\)
Rearranging this equation
\(Rate1 / [O_2 1]^{n} = k x [NO1]^ {m}Rate2 / [O_2 2]^{n} = k x [NO2]\)
but [NO 1] = [NO 2]
Hence,
\(Rate1 / [O_2 1]^ {n}= Rate2 / [O_2 2]^{n}\)
Rearranging and substituting in the values
\(([O_2 2] / [O_2 1])^{n} = Rate2 / Rate 1\)
\(2^{n} = 2\)
So, n = 1
Same from run 1 to 3
[NO] doubled
[O₂] stayed constant
Rate quadrupled
\((2)^{n} = 4\)
n = 2
we know that rate = k x [NO]² x [O₂]
Substitute in any value for [NO], [O₂] and rate and calculate K
k = rate / [NO]² x [O₂]
= (8.55x10⁻³ M / sec) / ((0.030M)² x (0.0055M))
= 1.7×103 M⁻²s⁻¹
Thus, option D is correct.
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Your question is incomplete, most probably complete question is
Determine the rate law and the value of k for the following reaction using the data provided.
2 NO(g) + O2(g) 2 NO2(g)
[NO]i (M) [O2]i (M) Initial Rate (M-1s-1)
0.030 0.0055 8.55 x 10-3
0.030 0.0110 1.71 x 10-2
0.060 0.0055 3.42 x 10-2
A. Rate = 57 M-1s-1[NO][O2]
B. Rate = 3.8 M-1/2s-1[NO][O2]1/2
C. Rate = 3.1×105 M-3s-1[NO]2[O2]2
D. Rate = 1.7×103 M-2s–1[NO]2[O2]
An empty container with a volume of 150.0 cm3 is weighed and found to have a mass of 72.5 g. The container is filled with a liquid and reweighed. The mass of the container and the liquid is 194.37 g. Determine the density of the liquid to the appropriate number of significant figures. (1 cm3 = 1 mL)
Answers
The density of the liquid is 0.8125 g/mL.
What is density?Density is the mass of a material substance per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density. For instance, while Earth has a density of 5.51 grams per cubic centimeter, water has a density of 1 gram per cubic centimeter. Another way to state density is in kilograms per cubic meter (in meter-kilogram-second or SI units). For instance, air weighs 1.2 pounds per cubic meter. In textbooks and manuals, the densities of typical solids, liquids, and gases are stated. The mass of a body can easily be determined from its volume or vice versa using a density.
mass of liquid = (mass of container and liquid) - (mass of empty container)
mass of liquid = 194.37 g - 72.5 g = 121.87 g
The volume of the liquid is equal to the volume of the container, which is 150.0 ml. (1 cm3 = 1 mL)
The density of the liquid is the mass of the liquid divided by the volume of the liquid:
density = mass/volume
density = 121.87 g / 150.0 ml
density = 0.81 g/ml
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What is the lead concentration of a saturated solution of lead(II) sulfate containing 0.020 M Na2SO4? Ksp for PbSO4 = 6.3x10-7.
Answers
Answer:
i want to help but i d k. the answer :( sorry i couldnt help
Explanation:
What attractive force pulls electrons toward protons to form chemical bonds?
A. Chemical bonding
B. Attraction of opposites
C. Electronegativity
D. Ionization energy
Answers
Answer:
C). Electronegativity.
Explanation:
'Electronegativity' is described as the tendency or a measure of the ability of an atom or molecule to attract electrons that leads to the formation of chemical bonds. It is denoted by 'χ', a Greek letter. The elements like Fluorine having a very high rate of electronegativity, its atom would attract the electrons more strongly while the elements with lesser electronegativity like Cesium would possess a lesser tendency to attract electrons towards it in order to form a bond. Thus, option C is the correct answer.
The Earth and the spaceship both have mass. The astronaut is attracted to Earth by gravity, but he is not attracted to the spaceship. Explain.