Question 1

Which is a compound?

Accepted Answer

sugar

Answer

air

Answer

sodium

Answer

nitrogen

Question 2

This table provides information about some group 1 elements. Which is the best estimate of the melting point of Rubidium (Rb)?

Accepted Answer

40

Answer

184

Answer

75

Answer

25

Question 3

Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total weight of the two liquids is less than before they were poured together. Which best describes this observation?

Accepted Answer

Some of the atoms during the reaction escaped into the air.

Answer

Some of the atoms during the reaction changed to a different kind of atom.

Answer

Some of the atoms during the reaction became heavier.

Answer

Some of the atoms during the reaction were destroyed.

Question 4

This is a chemical reaction for the decomposition of carbonic acid into water and carbon dioxide.

H2CO3 → H2O + CO2

How does the reaction support the Law of Conservation of Mass? The definition is in a chemical reaction mass is neither created nor destroyed.

Accepted Answer

The mass of the atoms in the reactant equals the mass of the atoms in the products

Answer

The mass of hydrogen atoms is the only thing that remains the same before and after the reaction.

Answer

Several molecules of water are produced.

Question 5

Which best describes a method of obtaining energy that may cause changes in water temperature and harm to fish populations?

Accepted Answer

burning coal

Answer

using ethanol in cars

Answer

installing solar panels on a home

Answer

generating electricity in a hydroelectric power plant

Question 6

Which is a nonrenewable resource?

Accepted Answer

oil

Answer

sunlight

Answer

wood

Answer

water

Question 7

Which disease is caused by a fungal infection?

Accepted Answer

athlete’s foot

Answer

chicken pox

Answer

intestinal worms

Answer

influenza

Question 8

How are pandemics different than epidemics?

Accepted Answer

Pandemics affect many countries or states; an epidemic is more localized

Answer

Pandemics are spread through the air; epidemics are spread through the water.

Answer

Pandemics affect blood; epidemics affect skin

Answer

Pandemics are caused by bacteria; epidemics are caused by viruses.

Question 9

What would have the greatest long-term impact on reducing the amount of carbon dioxide in the air?

Accepted Answer

planting trees around a farm

Answer

decreasing the number of livestock on a farm

Answer

cutting down trees around a farm

Answer

increasing the number of livestock on a farm

Question 10

Which is classified as an element?

Accepted Answer

iron

Answer

carbon dioxide

Answer

vinegar

Answer

water

Question 11

Which best describes the sequence of the elements in Period 5 of the periodic table?

Accepted Answer

highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases

Answer

nonreactive gases, nonreactive metals, highly reactive metals, metalloids, reactive nonmetals, reactive gases

Answer

highly reactive gases, relatively nonreactive metals, metalloids, very nonreactive gases, nonreactive nonmetals

Answer

nonreactive gases, metalloids, nonreactive metals, highly reactive metals, highly reactive gases

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