Chemistry Exam Review

Which of the following is true for all chemical reactions?

• The total mass of the reactants increases.

• The total mass of the products is greater than the mass of the reactants.

• The total mass of the products is less than the total mass of the reactants.

• The total mass of the reactants equals the total mass of the products.

Tags

NGSS.HS-PS1-7

According to the law of conservation of mass, mass is neither created nor destroyed during a chemical reaction. On the basis of this law, what mass of water was produced in this reaction?

• 76.5 g

• 18.0 g

• 3.50 g

• 22.0 g

Tags

NGSS.HS-PS1-7

Which of the following is a chemical property?

• Boils at 56ºC

• Soluble in water

• Has a density of 2.9 g/cm³

• Reacts with acid to produce hydrogen gas

Tags

NGSS.MS-PS1-2

Which of the following changes is a physical change of matter?

• water evaporating

• paper burning

• a nail rusting

• an egg frying

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NGSS.MS-PS1-4

Which of the following changes is a chemical change of matter?

• ice melting to form water

• vinegar combining with baking soda to produce carbon dioxide

• water boiling to form water vapor

• liquid silica solidifying to form glass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A physical blend of two or more components, or parts is known as a(n):

• element

• compound

• mixture

• allotrope

Which statement best describes an element?

• any combination of two or more atoms of different types

• a pure substance made up of only one kind of atom

• a substance containing only carbon atoms

• any kind of crystal

Which of the following is NOT a physical property of water?

• Ice melts at 0°C.

• Water boils at 100°C.

• Water reacts violently with pure sodium.

• Water is a liquid at room temperature.

Which of these measurements has been expressed to three significant figures?

• 0.052 g

• 0.202 g

• 3.065 g

• 500 g

The diameter of a carbon atom is 0.000 000 000 154 m. What is this number expressed in scientific notation?

• 1.54 x 10¹² m

• 1.54 x 10⁻¹² m

• 1.54 x 10¹⁰ m

• 1.54 x 10⁻¹⁰ m