Modified True/False

When a substance burns, matter is destroyed.

False; conserved

Modified True/False

Elements on the far right of the periodic table are classified as nonmetals.

True

Modified True/False

Substances are either elements or mixtures.

False; compounds

Modified True/False

Every atom of the same element has the same atomic number.

True

Modified True/False

For an atom to be neutral, the number of protons must equal the number of neutrons.

False; electrons

Modified True/False

Matter always has mass.

True

Matter that has the same composition and properties throughout is called a(n) ____.

substance

When two pure substances are combined so that each of the pure substances retains its own properties, the result is a(n) ____.

mixture

All ____ except mercury are solids at room temperature.

metals

How many atoms of calcium are in a unit of calcium phosphate whose formula is Ca₃(PO₄)₂?

3

In general, nonmetals are ____ at room temperature.

gases

In general, metals are ____ conductors of heat.

good

Water and hydrogen peroxide have different properties because ____.

One contains more oxygen in a molecule than the other

True or False

During chemical changes, matter is destroyed.

False

True or False 

Matter has mass and takes up space.

True

True or False

Matter can be divided into pure substances and mixtures.

True

The millions of compounds that exist are made from approximately ____ elements.

115

True or False

Matter is made up of atoms.

True

Most of the mass of an atom is found in its ____.

nucleus

Vegetable soup is an example of a ____ mixture.

heterogeneous

When someone stirs cocoa powder into hot water or hot milk, the cocoa changes from a ____ mixture to a _____ mixture.

heterogeneous; homogeneous

A certain atom has 26 protons, 26 electrons, and 30 neutrons. It mass number is ____.

56

True or False

An odorless, colorless gas is matter.

True

True or False

The heat given off by a light bulb is matter.

False

True or False

Alpha particles are matter.

True

True or False

An electron cloud is matter.

True

All matter is made up of particles called ______________.

atoms

If pure gold is classified as 24-karat gold, then 10-karat gold must be a ____________________ mixture.

heterogeneous

Elements on the left side of the periodic table are classified as ____________________.

metals

A pillowcase full of Halloween candy is a ____________________ mixture.

heterogeneous

For material to be classified as a pure ____________________, every bit of it must have the same properties.

substance

Elements that have properties halfway between those of metals and nonmetals, are classified as ____________________.

metalloids

Modified True/False

Matter in which particles are arranged in a repeating geometric pattern is called a(n) amorphous solid.

False; crystalline

Modified True/False

Oil will float on water because oil is less dense than water.

True

Modified True/False

True

Modified True/False

When a gas condenses to a liquid it absorbs heat from its surroundings.

releases heat to

Modified True/False

The rate of evaporation of a liquid decreases as the temperature decreases.

True

Modified True/False

The pressure inside the tires is greater after an automobile has been driven for a few hours than the tire pressure at the beginning of the trip.

True

The measure of the average kinetic energy of the particles of a substance is the ____.

temperature

The ____ is a unit of force.

newton

Kinetic energy is the ____ of motion.

energy

Viscosity is a measure of a fluid's resistance to ____.

flow

The measurement of force per unit area is called ____________________.

pressure

To calculate the density of a sample of matter, you must divide its ____________________ by its ____________________.

mass, volume

The change in state from a gas to a liquid is called ____________________.

condensation

The temperature at which ice changes into liquid water is called its ____________________.

melting point

Heat is the ____________________ of thermal energy from a higher temperature to a lower temperature.

movement

Vaporization is when a ____________________ changes into a ____________________.

liquid, gas

Modified True/False

A description of an object based on what you observe with your senses includes physical properties.

True

Modified True/False

The ability of a match to burn is an example of a chemical change.

False; a chemical property

Modified True/False

One of the chemical properties of acids is that they corrode metal.

True

Modified True/False

When acids react with bases, a metal is formed.

False; a salt

Modified True/False

a chemical

True or False

Density is a physical property.

True

True or False

Shape is a physical property.

True

True or False

Color is a physical property.

True

True or False

The ablity to react with oxygen is a physical property.

False

Density is equal to ____.

mass divided by volume

An acidic sample has a pH ____.

between 0 and 7

A basic sample has a pH range ____.

between 7 and 14

A neutral sample has a pH ____.

of exactly 7

A characteristic of matter that allows it to change to something new is a ________ property.

chemical

True or False

The ability to burn is a chemical property.

True

True or False

The ability to be crushed is a chemical property.

False

True or False

The ability to react with oxygen is a chemical property.

True

True or False

Toxicity is a chemical property.

True

True or False

One of the chemical properties of bases is that they feel slippery.

True

True or False

According to the law of conservation of mass, three atoms of calcium can react to produce six atoms of calcium.

False

True or False

Chemical equations are balanced by changing the subscripts of the molecules.

False

True or False

Energy is needed to break bonds in chemical reactions.

True

True or False

A chemical reaction in which more energy is absorbed than is released is endothermic.

True

True or False

All chemical reactions occur at the same rate.

False

True or False

Activation energy is the minimum amount of energy needed for a chemical reaction to begin.

True

True or False

Activation energy is the minimum amount of energy needed for a chemical reaction to begin.

True

True or False

When a chemical equation contains the same number of atoms on both sides, the equation is balanced.

True

True or False

Lowering the temperature slows down most chemical reactions.

True

True or False

The rate of a reaction is the speed at which products form or reactants disappear.

True

Chemical Change or Physical Change?

Water is boiled

Physical Change

Chemical Change or Physical Change?

Aluminum foil is crumpled.

Physical Change

Chemical Change or Physical Change?

Glass is shattered.

Physical Change

Chemical Change or Physical Change?

Wood is burned

Chemical Change

Each substance written to the right of the arrow in a chemical equation is a ____.

product

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?

They are equal

When the following chemical reaction is balanced, what number is placed before NH₃?

 → NH

₃

2

Is this equation balanced?

Na + O₂→

Yes

Is this equation balanced?

2Na₂ + O₂ →

No

Is this equation balanced?

2Na + 2O₂ 

No

Is this equation balanced?

4Na + O₂→ 

2Na₂O

No

True or False

The solubility of a substance describes how fast a solute will dissolve.

False

True or False

A solution is a homogeneous mixture.

True

True or False

Solutes can be separated from the their solvents by physical means.

True

True or False

Dissolution is the forming of a precipitate.

False

True or False

All liquid solutions contain water.

False

True or False

All aqueous solutions contain water.

True

True or False

For the same concentration, strong acids have lower pH values than weak acids.

True

True or False

Indicators can be used to find out how acidic or basic a solution is.

False

True or False

A solution is neutral if it has more hydronium ions than hydroxide ions.

False

True or False

An antacid has a pH greater than seven.

False

True or False

Water is often called the universal solvent.

True

True or False

A solution in which a gas is the solvent is an aqueous solution.

False

True or False

Vinegar and oranges both contain acids.

True

True or False

Hydrochloric acid can be used to clean mortar from brick walls.

True

True or False

Acids give soaps their useful properties.

False

The substance being dissolved to form a solution is the ____.

solute

The atmosphere of Earth is an example of a ____ -_______ solution.

gas-gas

A solution that contains all the solute it can hold under the given conditions is ____.

saturated

A solution that contains a large amount of solute compared to solvent is described as ____.

concentrated

Characteristic of acidic solutions?

has a sour taste

Yes

Characteristic of acidic solutions?

conducts electricity

Yes

Characteristic of acidic solutions?

feels slippery

no

Characteristic of acidic solutions?

is corrosive to certain metals

yes

Substance?

drinking water

yes

Substance?

brass

yes

Substance?

air

yes

Substance?

pizza

no

When aqueous solutions of table salt and silver nitrate are mixed, a white solid forms. This solid is ____.

a precipitate

Stainless steel is an example of a ____ - ______ solution.

solid-solid

Modified True/False

You see a kite start to fly because heat has been transferred to it.

False; energy

Modified True/False

Kinetic energy

False; Potential Energy

Modified True/False

As you decrease the velocity of a car, you increase its kinetic energy.

False; decrease

Modified True/False

The law of conservation of electricity can be used to identify the energy changes in a system.

False; energy

Modified True/False

The biggest source of energy on Earth is radioactive atoms.

False; the sun

When you see a change in the environment you know that ____ has been transferred.

energy

A kite stuck in a tree has ____ energy.

potential

When a rubber band is stretched, it has ____ energy.

potential

A green plant has ____ energy.

chemical

____________________ is the ability to cause change.

Energy

To do work, you need ____________________.

energy

Kinetic energy is the energy of ____________________.

motion

The kinetic energy of an object depends on its ____________________ and its ____________________.

mass; speed

The potential energy of an object depends on its ____________________ and its ____________________.

height; mass

____________________ energy comes from the nuclei of uranium atoms.

Nuclear