Our Role in the Electoral Process — Unit test

Question 1

In an investigation, the atoms of a certain substance lose energy during a change of state. Before the change, the atoms are far apart and move constantly at high speeds and in all directions. After the change, the atoms are close together but are able to slide past one another.Use the diagram that shows changes of state between solid, liquid, and gas to answer the question.

Revolt · Accepted Answer

O

Question 2

Which is the balanced equation for S8 + O2 → SO2?

Revolt · Accepted Answer

S8 + 8O2 → 8SO2

Question 3

This chart lists four elements from the periodic table.Atoms from which two elements would form ionic bonds?

Revolt · Accepted Answer

iodine and calcium

Question 4

Which best describes a semiconductor?

Revolt · Accepted Answer

Semiconductors are more conductive than a nonmetal and less conductive than a metal.

Question 5

Hsaio manages the finances for her company and has a particularly large amount of money budgeted for the purchase of calcium chloride, or CaCl2. Which type of company does Hsaio most likely own?

Revolt · Accepted Answer

a snow-plowing service

Question 6

Which properties do metalloids share with metals?

Revolt · Accepted Answer

Both are shiny and are solid at room temperature.

Question 7

Which statement best describes the explanatory powers of hypotheses and theories?

Revolt · Accepted Answer

The explanation given by a theory is well tested and supported by many observations and hypotheses.

Question 8

Consider the reaction below.2C6H14 + 19O2 12CO2 + 14H2OHow many moles of hexane (C6H14) must burn to form 18.4 mol of carbon dioxide?

Revolt · Accepted Answer

3.07 mol

Question 9

During a camping trip, Sierra collected dry branches and broke them into smaller pieces. She then placed the sticks in a fire pit and used a match to light the sticks on fire. Next, she propped a metal pan of water over the fire and heated it until the water boiled.

Revolt · Accepted Answer

physical changes: breaking sticks, boiling waterchemical change: lighting the fire

Question 10

Many scientists are concerned that the Ogallala aquifer in the United States is being depleted at an alarming rate. What would most likely be a major effect of this aquifer running dry?

Revolt · Accepted Answer

Many crops would die because irrigation water would be limited.

Our Role in the Electoral Process — Unit test Answers

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