Quiz about NC 8th Science 8.P.1 Review

Question 1

Which is the best example of a pure substance?

Accepted Answer

gold

Answer

peanuts

Answer

milk

Answer

air

Question 2

This chart represents several compounds and their chemical formulas. Which explains why the same elements can create many different compounds?

Accepted Answer

Elements combine in a multitude of ways to produce compounds that account for all living and nonliving substances.

Answer

Elements combine in the same way to produce a variety of substances.

Answer

Elements have the ability to change electron size in order to combine with many different elements.

Question 3

Why does hydrogen (H) have a different subscript in each substance?

Accepted Answer

The subscript indicates the number of hydrogen atoms in each substance.

Answer

The subscript indicates the number of mixtures that the hydrogen is forming.

Answer

The subscript indicates the number of compounds that the hydrogen is forming.

Answer

The subscript indicates whether the hydrogen is forming a compound or a mixture.

Question 4

The table shows the chemical formulas for several common household substances. Which two elements make up household ammonia?

Accepted Answer

nitrogen and hydrogen

Answer

neon and helium

Answer

neon and hydrogen

Answer

nitrogen and helium

Question 5

The table below shows common compounds and their chemical formulas. Which can best be concluded from this information?

Accepted Answer

Elements combine in many ways to form different compounds.

Answer

Some compounds contain only one element.

Answer

All compounds contain the same number of elements.

Answer

Elements combine in the same way to form different compounds.

Question 6

Sodium (Na) and chlorine (Cl) combine to form table salt (NaCl). How many sodium (Na) atoms are there for every chlorine atom (Cl)?

Accepted Answer

one sodium (Na) atom for every one chlorine (Cl) atom

Answer

two sodium (Na) atoms for every one chlorine (Cl) atom

Answer

one sodium (Na) atom for every two chlorine (Cl) atoms

Question 7

In which state of matter will the atoms of an element be tightly packed together?

Accepted Answer

solid

Answer

gas

Answer

liquid

Question 8

How are atoms combined in a mixture?

Accepted Answer

physically combined and can be separated

Answer

chemically combined and cannot be separated

Answer

chemically combined and can be separated

Question 9

How can mixtures best be described?

Accepted Answer

made of different elements that are not all chemically bonded together

Answer

made of one element

Answer

made of different elements that are all chemically bonded together

Question 10

The table shows properties of several elements. Which element would Element X most likely be grouped with on the periodic table?

Accepted Answer

potassium

Answer

calcium

Answer

chlorine

Answer

copper

Question 11

Which pair of elements has the most similar properties?

Accepted Answer

N and P

Answer

Li and B

Answer

I and Ca

Answer

K and He

Question 12

Which element will most likely gain electrons?

Accepted Answer

Cl

Answer

Na

Answer

Ne

Question 13

Where on the periodic table are you most likely to find elements that do not react with other elements?

Accepted Answer

group 18

Answer

group 1

Answer

group 17

Question 14

If an element has no electrons to share and is stable, what family is it found in?

Accepted Answer

noble gases

Answer

alkali metals

Answer

halogens

Question 15

What is the significance of metalloids in the periodic table?

Accepted Answer

They separate metals from nonmetals.

Answer

They separate liquids from solids.

Answer

They combine elements and compounds.

Question 16

Why are certain elements placed into the same column on the periodic table?

Accepted Answer

They have the same number of electrons in their outer energy level.

Answer

They have the same number of protons in their nuclei.

Answer

They have the same number of electrons in their nuclei.

Question 17

Which elements are most likely to react in the same manner in a chemical reaction?

Accepted Answer

elements in the same group

Answer

elements in the same period

Answer

elements with similar atomic masses

Question 18

What best describes the reactivity of alkali metals?

Accepted Answer

Reactivity increases down a group.

Answer

Reactivity increases left to right across a period.

Answer

Reactivity decreases left to right across a period.

Question 19

What happens to water molecules during the boiling process?

Accepted Answer

They move faster and move farther apart as they absorb heat.

Answer

They move faster and remain close together as they absorb heat.

Answer

They move more slowly but move farther apart as they lose heat.

Answer

They move faster and move farther apart as they lose heat.

Question 20

An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated?

Accepted Answer

The molecules will begin to move faster.

Answer

The molecules will begin to move slower.

Answer

The molecules will begin to increase in density.

Answer

The molecules will begin to condense in the air.

Question 21

Which shows one example of a physical change and one example of a chemical change?

Accepted Answer

freezing water and burning coal

Answer

boiling water and melting wax

Answer

rusting iron and baking a cake

Answer

dissolving powder and shredding paper

Question 22

Sugar is dissolved in a glass of hot water until no more sugar will dissolve. As the glass of hot water cools, a white crystalline solid is observed on the bottom of the glass. Which best describes the identity of the white crystalline solid?

Accepted Answer

The white crystalline solid is sugar.

Answer

The white crystalline solid is an impurity in the water.

Answer

The white crystalline solid is produced from the mixture of sugar and water.

Question 23

Baking soda and vinegar was mixed and a match was struck. Which best explains why the lit match went out when placed in the mouth of the flask?

Accepted Answer

The baking soda and vinegar reacted to produce carbon dioxide gas. The carbon dioxide gas caused the lit match to go out.

Answer

The baking soda and vinegar reacted to produce hydrogen gas. The hydrogen gas caused the lit match to go out.

Answer

The baking soda and vinegar reacted to produce oxygen gas. The oxygen gas caused the lit match to go out.

Question 24

What is the best way to measure the gas produced in a chemical reaction?

Accepted Answer

Perform the experiment in a closed system.

Answer

Perform the experiment in a beaker.

Answer

Perform the experiment in a room.

Question 25

When a marshmallow is toasted over a fire, which is the best description for what happens to the outside of the marshmallow?

Accepted Answer

chemical change

Answer

physical change

Answer

enzyme creation

Question 26

Two clear solutions are mixed together in a beaker. Which result would indicate a chemical reaction had occurred between these solutions?

Accepted Answer

increase of volume in the beaker

Answer

decrease of volume in the beaker

Answer

increase in temperature of the beaker

Question 27

What is the best evidence for a chemical reaction?

Accepted Answer

color change

Answer

cutting a metal

Answer

change of state

Question 28

Which chemical change occurs due to mixing baking soda and vinegar?

Accepted Answer

gas production

Answer

combustion

Answer

heat production

Question 29

Batteries lose effectiveness over time because of chemical reactions that occur in the batteries. Where is the best place to store batteries to keep them for a longer period of time?

Accepted Answer

Store them at room temperature.

Answer

Store them in a car.

Answer

Store them in water.

Question 30

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

Accepted Answer

During a chemical reaction, the total amount of matter stays the same

Answer

During a chemical reaction, matter is destroyed

Answer

During a chemical reaction, one or more new substances are formed

Answer

During a chemical reaction, the total number of atoms increases

Question 31

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

Accepted Answer

6 atoms of carbon (C)

Answer

12 atoms of carbon (C)

Answer

3 atoms of carbon (C)

Answer

2 atoms of carbon (C)

Question 32

Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

Accepted Answer

Gases were released to the atmosphere

Answer

A physical change occurred.

Answer

Atoms involved in the reaction lost mass.

Answer

Precipitates were created in the new solution.

Question 33

Which best describes how to balance the chemical equation shown below to support the law of conservation of mass?

Accepted Answer

Add the coefficient 2 before the O2 on the left side of the equation.

Answer

Add the coefficient 2 before the Mg on both sides of the equation.

Answer

Add the coefficient 2 before the Mg on the left side of the equation.

Answer

Add the coefficient 2 before the MgO on the right side of the equation.

Question 34

Which best explains why the equation is not balanced? The equation below shows a reaction between sodium (Na) and water (H2O).

Accepted Answer

There is not enough water in the reactants.

Answer

There is too much sodium in the reactants.

Answer

There is too much hydrogen gas in the products.

Answer

There is not enough sodium hydroxide in the products.

Question 35

The conversion of 7.0 grams of carbon monoxide and 7.5 grams of nitrogen monoxide using 3.0 grams of platinum catalyst is shown. Which best represents the total mass of carbon dioxide and nitrogen gases produced in this process?

Accepted Answer

10.5 grams

Answer

3.5 grams

Answer

14.5 grams

Question 36

What is the total number of oxygen atoms on the reactant side of the equation shown?

Accepted Answer

5

Answer

2

Answer

3

Answer

7

Question 37

This chemical reaction occurs. How many atoms of hydrogen are involved in the reaction?

Accepted Answer

4

Answer

1

Answer

2

Answer

8

Question 38

A chemical reaction occurs. Based on the law of conservation of mass, how much hydrogen gas is produced compared to the amount of oxygen produced?

Accepted Answer

the same amount

Answer

half as much

Answer

twice as much

Answer

four times as much

NC 8th Science 8.P.1 Review

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