Part 4 Final Exam

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Name:

Part 4 Final Exam

Multiple Choice

Identify the letter of the choice that best completes the statement or answers the question.

Substances that prevent chemical reactions are called _____.

a.	catalysts
b.	endothermics
c.	inhibitors
d.	products
e.	reactants

When one element displaces another element in a compound, the reaction is a _____ reaction.

a.	decomposition	c.	single-displacement
b.	double-displacement	d.	synthesis

Each substance to the right of the arrow in a chemical equation is a(n) _____.

a.	catalyst
b.	inhibitor
c.	precipitate
d.	product
e.	reactant

A chemical reaction in which energy is released is _____.

a.	endothermic
b.	exothermic
c.	flammable
d.	a formula
e.	an inhibitor

A substance that speeds up a chemical reaction without undergoing a permanent change itself is _____.

a.	a catalyst
b.	a coefficient
c.	an inhibitor
d.	a reactant
e.	a product

Numbers that precede symbols and formulas in a chemical equation are _____.

a.	catalysts
b.	coefficients
c.	fractions
d.	subscripts
e.	superscripts

A term that means "putting together" is _____.

a.	catalyst
b.	decomposition
c.	product
d.	reactant
e.	synthesis

The breaking down of a compound into simpler substances is _____.

a.	decomposition	c.	product
b.	displacement	d.	synthesis

Each substance on the left side of the arrow in a chemical equation is a _____.

a.	catalyst
b.	coefficient
c.	product
d.	reactant
e.	synthesis

10.

If thermal energy must be added to a chemical reaction for the reaction to take place, the reaction is _____.

a.	balanced
b.	endothermic
c.	exothermic
d.	reactant
e.	coefficient

11.

In a chemical equation, the symbol that means "dissolved in water" is _____.

a.	(aq)
b.	(cr)
c.	(dw)
d.	(I)
e.	(g)

12.

Which of the following is a balanced chemical equation?

a.	AgNO₃ + NaCl —> 4AgCl + 2NaNO₃	c.	AgNO₃ + NaCl —> AgCl + NaNO₃
b.	2AgNO₃ + 2NaCl —> 3AgCl + 2NaNO₃	d.	AgNO₃ + 2NaCl —> AgCl + 3NaNO₃

13.

_____ chemical equation has the same number of atoms of each element on each side of the equation.

a.	A balanced	c.	A simple
b.	A complex	d.	An unbalanced

14.

Ozone in the atmosphere protects living things from _____.

a.	CFCs	c.	having too little food
b.	each other	d.	UV rays from the sun

15.

What type of reaction is shown in the following chemical equation? NH₃ + HCl —> NH₄Cl

a.	decomposition	c.	single displacement
b.	double displacement	d.	synthesis

16.

According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?

a.	There is no relationship.	c.	The mass of the reactants is greater.
b.	The mass of the products is greater.	d.	The masses are equal.

17.

What type of reaction is shown in the following chemical equation? 2H₂O —> 2H₂ + O₂

a.	decomposition	c.	single displacement
b.	double displacement	d.	synthesis

18.

Which of the following could represent a decomposition reaction?

a.	compound = element + element
b.	compound + compound = compound + compound
c.	element + compound = element + compound
d.	element + element = compound

19.

According to the law of conservation of mass, if two atoms of hydrogen are used as a reactant, how many atoms of hydrogen must be part of the product?

a.	0
b.	1
c.	2
d.	3
e.	4

20.

What is an insoluble solid that forms as the result of a chemical reaction?

a.	an aqueous	c.	an inhibitor
b.	a catalyst	d.	a precipitate

21.

One possible solution to harmful effects of _____ on the ozone layer is to find safe alternatives.

a.	CFCs	c.	smog
b.	fluorine	d.	smoke

22.

In a titration, the point where the indicator changes color is the _____.

a.	acid point	c.	pH point
b.	end point	d.	standard point

23.

In a titration, the solution for which the concentration is known is called the _____.

a.	indicator	c.	normal solution
b.	hydrate	d.	standard solution

24.

H₃O⁺ units are called _____.

a.	hydrogen ions	c.	hydroxide ions
b.	hydronium ions	d.	hydroxyl groups

25.

A substance that produces H⁺ ions in a solution is _____.

a.	an acid
b.	a base
c.	a salt
d.	a soap
e.	an alcohol

26.

A substance that produces OH^- ions in a solution is _____.

a.	an acid
b.	a base
c.	a salt
d.	a soap
e.	an alcohol

27.

When the acidity of a substance is determined by the hydronium ion concentration, the _____ of the substance is being calculated.

a.	ester
b.	base
c.	pH
d.	oxide
e.	saponification

28.

Organic substances that change color in the presence of an acid or a base are called _____.

a.	acids
b.	glycerins
c.	hydrates
d.	indicators
e.	soaps

29.

A compound formed in solution from the negative ion of an acid and the positive ion of a base is a _____.

a.	detergent	c.	salt
b.	glycerin	d.	soap

30.

A solution with a bitter taste and a slippery feel is most likely _____.

a.	an acid	c.	a hydrate
b.	a base	d.	a salt

31.

HCl is the formula for _____.

a.	the hydronium ion	c.	hydrogen peroxide
b.	hydrochloric acid	d.	sodium hydroxide

32.

Hydrochloric acid is sometimes used to remove impurities from metals in a process called _____.

a.	hydrating	c.	pickling
b.	neutralization	d.	saponification

33.

The terms dilute and concentrated refer to the _____ of a solution.

a.	acidity	c.	pH
b.	concentration	d.	strength

34.

The strength of a base that only partly dissociates in a solution would be described as _____.

a.	concentrated	c.	strong
b.	dilute	d.	weak

35.

One cause of acid rain is the _____.

a.	burning of fossil fuels
b.	use of fertilizers
c.	use of marble and limestone as building materials
d.	use of plankton as a food source

36.

A reaction between an acid and a base that produces a salt and water is a _____ reaction.

a.	decomposition	c.	saponification
b.	neutralization	d.	synthesis

37.

Coffee has a pH of about 5. Coffee is _____.

a.	extremely acidic	c.	slightly acidic
b.	extremely basic	d.	slightly basic

Matching

Match each item with the correct statement below.

a.	definitely an acid
b.	definitely a base
c.	could be either an acid or a base

38.

In solution, it conducts electricity.

39.

It reacts strongly with most metals.

40.

In solution, it feels slippery.

41.

It reacts with an indicator to produce a change in its color.

42.

It has a bitter taste.

43.

It has a sour taste.

44.

It has the chemical formula H₂SO₄.

45.

It has the chemical formula NaOH.