In chemical equations, as long as all of the coefficients are the same on both sides of the equation, the equation is balanced.True
False

Answers

Answer 1

Answer: False. The subscripts have to be read and you must see if both sides have the same number of atoms.

Answer 2

Answer: This statement is false. Not only the coefficients must be balanced, the subscripts and also the number of elements must be equation on BOTH sides of the equation. That means that the reactants and products are equal, and unchanging.

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Carbonic acid dissolves limestone and other rocks. this is an example of _____. acid erosion chemical weathering biological weathering chemical erosion

Answers

Chemical weathering.

Name 4 toxicants that are heavier than air

Answers

Answer:

CO2,H2S,HALON,FREON that's is the four toxicants that are heavier than air

how much oxygen would be produced by heating 20 g of mercury (II) oxide if 18.6 g of mercury is produced?

Answers

According to the stoichiometry of the reaction of mercury(II) oxide 1.477 g of oxygen would be produced by heating 20 g of mercury (II) oxide if 18.6 g of mercury is produced.

What is stoichiometry?

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

433.18 g mercury (II) oxide gives 32 g oxygen thus, 20 g of mercury (II) oxide will produce 20×32/433.18= 1.477 g of oxygen.

Thus, 1.477 g of oxygen would be produced by heating 20 g of mercury (II) oxide if 18.6 g of mercury is produced.

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Hg2O -> O2 + Hg
2Hg2O -> O2 + 2Hg
20g-> ?g + 18.6g
                     (1 molHg2O )      (1 mol O2)          (32g O2)
20g 2Hg2O x -------------------   x ------------------- x -------------- = 0.77g O2
                    (834.36Hg2O)    (1 mol Hg2O)       (1 mol O2)

Which of the following is not a phase change?melting of snow
evaporation of water from the ocean
condensation of water vapor to form clouds
hydrogen and oxygen gas combining to form water vapor

Answers

Answer : The correct option is hydrogen and oxygen gas combining to form water vapor.

Explanation :

Phase change : It is a change from one state to another state without changes in chemical composition.

Phase change such as solid to liquid, liquid to vapor, vapor to liquid, liquid to solid, vapor to solid, solid to vapor.

Melting of snow is a fusion process in which phase changes from solid to liquid.

Evaporation of water from the ocean is a evaporation process in which phase changes from liquid to vapor.

Condensation of water vapor to form clouds is condensation process in which phase changes from vapor to liquid.

Hydrogen and oxygen gas combining to form water vapor, there is no phase change in this reaction because a gas combine with another gas to form a water vapor as a gas.

hydrogen and oxygen gas combining to form water vapor is the correct answer.

What is the process that changes one set of chemicals into another set of chemicals?a. cohesion
b. hydrogen bonding
c. chemical reaction
d. dissolving

Answers

The process that changes one set of chemicals into another set of chemicals is called a chemical reaction. The correct answer is option c.

A chemical reaction is a process in which chemical bonds between atoms and molecules are broken and formed, resulting in the creation of new substances with distinct chemical properties.

In a chemical reaction, the reactants are the starting substances that react with each other, while the products are the new substances that are formed.

For example: When hydrogen gas reacts with oxygen gas in the presence of a spark or flame, a chemical reaction occurs that produces water as a product:

$\rm 2H_2 + O_2 \rightarrow 2H_2O$

Therefore, a chemical reaction is the process of transforming one set of chemicals into another set of chemicals. Option c is the correct answer.

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Answer: a. cohesion

Cohesion would be the process that changes one set of chemicals into another set of chemicals, as the reactants bond to bring the product, aka product(s).

Is polythene a conductor or an insulator (eletricity)