NMAT MASTERCLASS - EXAM 4

The word equation “magnesium reacts with chlorine to produce magnesium chloride” would be represented by which of the following formula equations?

• Mg --> Cl₂ + MgCl₂

• MgCl₂---> Mg + Cl₂

• MgCl₂ + Mg ---> Cl₂

• Mg + Cl₂ ---> MgCl₂

In balancing a chemical equation, which of the following are you allowed to do?

• change subscripts

• change superscripts

• write coefficients

• add new substances

Which of the following symbols means a substance is in water solution?

• (s)

• (l)

• (aq)

• (g)

What is the general form for a single-replacement reaction?

• A + B ---> AB

• AB -----> A + B

• A + BX ---> AX + B

• AX + BY --> AY + BX

According to the law of conservation of mass, the total mass of the reacting substances is _________

• Always more than the total mass of products

• Always less than the total mass of products

• Always equal to the total mass of the products

• sometimes more and sometimes less than total mass of products

The reaction 2 KClO_{3 (s)} -------> 2 KCl_(s) + 3O_2(g) is an example of what type of reaction?

• Synthesis reaction

• Decomposition reaction

• Double replacement reaction

• Combustion reaction

What is the expected product if sodium metal reacts with oxygen gas?

• NaO

• Na₂O

• NaO₂

• Na₂O₂

The symbol (s) written after a formula in a chemical equation stands for

• solution

• soluble

• solid

• synthesis

What is the product of the reaction magnesium oxide (MgO) with water?

• MgO , a metallic oxide

• Mg(OH)₂ , a metallic hydroxide

• Mg(ClO₃)₂ , a metallic chlorate

• MgCO₃, a metallic carbonate

Which type of chemical reaction typically involves an acid reacting with a base to produce salt and water?

• Combustion reaction

• Decomposition reaction

• Neutralization Reaction

• Precipitation reaction