The following chemical equation is balanced, but the coefficients used are larger than necessary. Rewrite this balanced equation using the smallest coefficients.

Describe briefly what happens when an ionic substance is dissolved in water.

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.)

CH$_4$ + ___ Cl$_2$ → ___ CCl$_4$ + ___ HCl

A. 4

B. 6

C. 8

D. 10

E 12

Consider the following unbalanced equation. $\mathrm{Ag}+\mathrm{H}_{2} \mathrm{S} \rightarrow \mathrm{Ag}_{2} \mathrm{S}+\mathrm{H}_{2}$ What is the sum of the coefficients when the equation is completely balanced using the smallest whole-number coefficients? (1) 5, (2) 8, (3) 10, (4) 4.

How do ionic compounds exist in their crystalline structure? What occurs when they are dissolved in water?

Distinguish between an ionic compound and a molecular compound dissolved in water. Do all molecular compounds ionize when dissolved in water? Explain.

What is the sum of the coefficients in the balanced chemical equation for the combustion of one mole of acetone, $C_3H_6O(l),$ in air?

Two objects, with masses 5.00 kg and 2.00 kg, hang 0.600 m above the floor from the ends of a cord that is 6.00 m long and passes over a frictionless pulley. Both objects start from rest. Find the maximum height reached by the 2.00-kg object.

Describe what happens in a combustion reaction.

The following passage contains mistakes in capitalization, grammar, and punctuation. Read the passage. Then answer the following questions. Mark your answers on a separate sheet of paper. (1) About a third of Kazakhstan's people are Ethnic Russians. (2) Kazakh and Russian—both official languages. (3) Many ethnic Kazakh's grow up speaking Russian at home and they have to learn Kazakh in school today. Which sentence contains incorrect capitalization? a. 1 b. 2 c. 3 d. None of them

How many moles of phosphoric acid would react to produce $0.4$ moles of lithium phosphate?

Given the following reaction $\ce{ Na2S2O3 + AgBr \rightarrow Na3(Ag(S2O3)2) + NaBr }$, how many moles of $\ce{Na2S2O3}$ are needed to react completely with $\ce{42.7 g}$ of $\ce{AgBr}$?

Ammonia is produced by the chemical reaction of hydrogen and nitrogen.

$$N_2(g) + 3H_2(g) {\longrightarrow} 2NH_3(g)$$

How many moles of $H_2$ are needed to react with $1.8$ moles of $N_2$?

Sulfur trioxide, $(SO_3),$ a pollutant released by coal-burning plants, can react with water in the atmosphere to produce sulfuric acid, $H_2SO_4.$ Write a balanced equation for this reaction.