CHEMISTRY HIGH SCHOOL

A chemical equation is balanced by changing or addinga.
chemical symbols.
c.
numbers in front of molecules.
b.
subscripts after atoms.
d.
reactants in the product.

Answers

Answer 1

Answer:

Answer: Option (c) is the correct answer.

Explanation:

A chemical equation will be balanced when there are equal number of both reactants and products.

For example, $Na + Cl_(2) \rightarrow NaCl$ is an unbalanced chemical equation.

As there are two molecules of Cl on reactant side and there is only one molecule of Cl present on product side.

Therefore, to balance this chemical equation we will place the numbers in front of molecules as follows.

$2Na + Cl_(2) \rightarrow 2NaCl$

Thus, we can conclude that a chemical equation is balanced by changing or adding numbers in front of molecules.

Answer 2

Answer:

A chemical equation is balanced by changing or adding numbers in front of molecules. The correct answer is option c.

A chemical equation is a symbolic representation of a chemical reaction in which the reactant molecules are on the left side and the product molecules are on the right side, with an arrow separating them to indicate the direction of the reaction.

Numbers in front of molecules are called coefficients, and they represent the number of molecules of each substance involved in the reaction. By changing the coefficients, you can balance the number of atoms on both sides of the equation.

Therefore, the correct answer is option c. numbers in front of molecules.

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If the solution process is endothermic, then an increase in temperature usually results in:an increase in solubility

a decrease in solubility

no change in the solubility

a slower reaction

Answers

If the solution process is endothermic, then an increase in temperature usually results in an increase in solubility. Their heat of reaction is usually positive. The rest of the choices do not answer the question above.

Answer:

solubility increases

Explanation:

When a lithium atom forms an Li+ ion, the lithium atom(1) gains a proton
(2) gains an electron
(3) loses a proton
(4) loses an electron

Answers

When a lithium atom forms a Li+ ion, the lithium atom looses an electron. Therefore, option 4 is correct.

What is an electron ?

The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are members of the lepton particle family's first generation, are typically regarded to be elementary particles.

Quarks make up protons and neutrons, but not electrons. We believe that quarks and electrons are basic particles that are not composed of lesser subatomic particles.

Three protons and three electrons make up a lithium atom. It may become an ion if one of its electrons is lost. It now has a net positive charge since there are more positive protons than negative electrons. It is a positive ion as a result.

Thus, option 4 is correct.

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Answer:

(4) loses an electron

it has 3 protons and electrons, proton no. cannot change, to make lithium an ion, it needs to have an exact number of electrons so that the electronic shell can be 2, 8… something like that. So lithium atom loses an electron in order to for Li+ ion. Making the electrons to have 2 as an electronic shell.

List the four components of natural gas in order of increasing strength of intermolecular forces.

Answers

ionic bonds
london dispersion
dipole dipole
hydrogen

The ratio of oxygen to carbon by mass in carbon monoxide is 1.33:1.00. part a find the formula of an oxide of carbon in which the ratio by mass of oxygen to carbon is 2.00:1.00.

Answers

To calculate the molecular formula, convert the mass ratio into molar ratio as follows:

mass ratio of O:C=2:1

molar mass of carbon is 12 g/mol and that of oxygen is 16 g/mol thus, number of moles can be calculated as follows:

n=\frac{m}{M}

calculating ratio,

O:C=\frac{2 g}{16 g/mol}:\frac{1 g}{12 g/mol}=\frac{1}{8}:\frac{1}{12}=12:8=3:2

thus, molecular formula will be C_{2}O_{3}

Final answer:

If the ratio of oxygen to carbon by mass is 2.00:1.00, the formula of the oxide of carbon is CO₂ (carbon dioxide). This is because CO₂ has twice as much oxygen per amount of carbon as compared to CO (carbon monoxide). This situation adheres to the law of multiple proportions.

Explanation:

This question revolves around the concept of stoichiometry in chemistry, particularly in relation to the law of multiple proportions and finding the formula of an oxide of carbon given specific mass ratios.

Firstly, in carbon monoxide (CO), the ratio of oxygen to carbon by mass is 1.33:1.00.

However, when the ratio of oxygen to carbon by mass increases to 2.00:1.00, we are now dealing with a compound that contains twice as much oxygen per amount of carbon. In essence, this would be carbon dioxide (CO₂). The mass ratio of oxygen to carbon in CO₂ is indeed 2:1 (32 g/mol oxygen: 12 g/mol carbon).

This situation illustrates the law of multiple proportions - in this case, the two oxides of carbon (CO and CO₂) contain elements combined in ratios of small whole numbers.