a possible answer to a question or a possible solution to a problem based on what you know and what you observe.

a possible question to an answer or a possible solution to a problem based on what you know and what you observe.

a possible question to a answer or a possible problem to a solution based on what you know and what you observe.

a possible answer to a question or a possible solution to a problem based on what you know and what you can tell.

tests the effect of one thing on another using a control.

tests the effect of two things on another using a control.

tests the effect of two things on another using a variable.

tests the effect of one thing on another using a variable.

a quantity that can have more than a single value.

a quantity that can have more than a value.

a quantity that can have less than a value.

a quantity that can have less than a single value.

its value changes according to the changes in the other variables

its value stays the same according to the changes in the other variables

its value stays the same according to the changes in the same variables

its value changes according to the changes in the same variables

The variable that is changed to see how it will affect the dependent variable

The variable that is the same to see how it will affect the dependent variable

The variable that is the same to see how it will affect the control variable

The variable that is changed to see how it will affect the control variable

A factor that does not change

A factor that does change

the standard by which test results can be compared.

the standard by which test results can be contrasted.

the standard by which test can be contrasted.

the standard by which test can be compared.

occurs when a scientist’s expectations change how the results are analyzed or conclusions are formed.

occurs when a scientist’s failures change how the results are analyzed or conclusions are formed.

occurs when a scientist’s failures change how the tests are analyzed or conclusions are formed.

occurs when a scientist’s expectations change how the tests are analyzed or conclusions are formed.

represents an idea, event, or object to help people better understand it.

represents an idea, event, or object to destroy people better understand it.

represents an idea, event, or object to destroy people understand it.

represents an idea, event, or object to help people understand it.

an explanation based on knowledge gained from many observations and investigations.

an explanation based on theories gained from many observations and investigations.

an explanation based on theories gained from not many observations and investigations.

an explanation based on knowledge gained from not many observations and investigations.

a statement about what happens in nature and that seems to be true all the time.

a statement about what happens in the world and that seems to be true all the time.

a statement about what happens in the world and that seems to be false all the time.

a statement about what happens in nature and that seems to be false all the time.

an exact quantity that people agree to use to compare measurements.

a quantity that people agree to use to compare measurements.

a quantity that people disagree to use to compare measurements.

an exact quantity that people disagree to use to compare measurements.

universally accepted and understood by scientists throughout the world.

universally unaccepted and understood by scientists throughout the world.

universally unaccepted and misunderstood by scientists throughout the world.

universally accepted and misunderstood by scientists throughout the world.

The amount of space occupied by an object

The amount of area occupied by an object

anything that takes up space and has mass.

anything that takes up space.

anything that takes mass.

a measurement of the quantity of matter in an object.

a measurement of the quantity of mass in an object.

a measurement of the quantity of mass in an atom.

a quantity of matter in an object.

mass per unit volume of a material.

volume per unit mass of a material.

a visual display of information or data.

a visual display of data.

a visual display of information.

the application of scientific knowledge to benefit people.

the application of knowledge to benefit people.

the application of knowledge to fail people.

the scientific knowledge to benefit people.

a group of people that share similar values and beliefs.

people that share similar values and beliefs.

people that share different values and beliefs.

a group of people that share different values and beliefs.

Line graph

Bar graph

Circle/ pie chart

Comparing and displaying information

Displaying information

Comparing information

to show how some fixed quantity is broken into parts

to show how some broken parts

to show how some quantities is broken into parts

an explanation of how the particles in gases behave.

an explanation of how the particles in solids behave.

an explanation of how the particles in liquids behave.

an explanation of how the particles in plasmas behave.

the temperature at which a solid becomes a liquid.

the temperature at which a solid becomes a gas.

the temperature at which a liquid becomes a gas.

the temperature at which a liquid becomes a solid.

the temperature at which a gas becomes a liquid.

the energy required to change a substance from solid to liquid at its melting point.

the energy required to change a substance from solid to gas at its boiling point.

the energy required to change a substance from liquid to gas at its boiling point.

the energy required to change a substance from gas to liquid at its melting point.

the energy required to change a substance from gas to solid at its boiling point.

a liquid is the temperature at which the pressure of the vapor in the liquid is equal to the external pressure acting on the surface of the liquid.

a solid is the temperature at which the pressure of the vapor in the solid is equal to the external pressure acting on the surface of the solid.

a gas is the temperature at which the pressure of the vapor in the gas is equal to the external pressure acting on the surface of the gas.

a plasma is the temperature at which the pressure of the vapor in the plasma is equal to the external pressure acting on the surface of the plasma.

the amount of energy required for the liquid at its boiling point to become a gas.

the amount of energy required for the liquid at its freezing point to become a solid.

the amount of energy required for the liquid at its melting point to become a liquid.

the amount of energy required for the liquid at its boiling point to become a plasma.

the process of a solid changing directly to a gas without forming a liquid.

the process of a solid changing directly to a liquid without forming a gas.

the process of a liquid changing directly to a gas without forming a plasma.

the process of a gas changing directly to a solid without forming a liquid.

matter that has enough energy to overcome not just the attractive forces between its particles but also the attractive forces within its atoms.

matter that has enough energy to overcome not just the attractive forces between its atoms but also the attractive forces within its atoms.

matter that has less energy to overcome not just the attractive forces between its particles but also the attractive forces within its atoms.

matter that has enough energy to overcome not just the unattractive forces between its particles but also the unattractive forces within its atoms.

an increase in the size of a substance when the temperature is increased.

an increase in the size of a substance when the temperature is decreased.

an decrease in the size of a substance when the temperature is increased.

an decrease in the size of a substance when the temperature is decreased.

the ability of a fluid—a liquid or a gas—to exert an upward force on an object immersed in it.

the ability of a fluid—a liquid or a solid—to exert an upward force on an object immersed in it.

the ability of a fluid—a liquid or a solid—to exert an downward force on an object immersed in it.

the ability of a fluid—a solid or a gas—to exert an downward force on object above it.

force exerted per unit area.

area exerted per unit force.

the resistance of a fluid to flowing.

the fluid flowing.

the resistance of an object to floating.

if you decrease the volume of a container of gas and hold the temperature constant, the pressure from the gas will increase.

if you increase the volume of a container of gas and hold the temperature constant, the pressure from the gas will decrease.

if you decrease the volume of a container of gas and hold the temperature constant, the pressure from the gas will decrease.

if you increase the volume of a container of gas and hold the temperature constant, the pressure from the gas will increase.

the volume of a gas increases with increasing temperature as long as the pressure on the gas does not change

the volume of a gas decreases with increasing temperature as long as the pressure on the gas does not change

the volume of a gas decreases with decreasing temperature as long as the pressure on the gas does not change

the volume of a gas increases with decreasing temperature as long as the pressure on the gas does not change

a type of matter with a fixed composition. A substance can be an element or a compound.

a type of mass with a fixed composition. A substance can be an element.

a type of matter with a fixed composition. A substance can be a compound.

a type of matter with a fixed composition. A substance can be an element.

a substance made up of atoms that are all alike.

a substance made up of elements that are all alike.

a substance made up of substances that are all alike.

a substance made up of mixtures that are all alike.

a substance in which the atoms of two or more elements are chemically combined in a fixed proportion.

a substance in which the elements of two or more atoms are chemically combined in a fixed proportion.

a substance in which the elements of two or more substances are chemically combined in a fixed proportion.

a substance in which the atoms of two or more mixtures are chemically combined in a fixed proportion.

A mixture in which different materials remain distinct

A mixture in which the same materials remain distinct

a heterogeneous mixture made of a liquid and solid particles that settle.

a heterogeneous mixture made of a liquid and gas particles that settle.

a heterogeneous mixture made of a gas and solid particles that settle.

a heterogeneous mixture made of a plasma and liquid particles that settle.

a heterogeneous mixture with particles that never settle.

a homogeneous mixture with particles that never settle.

The scattering of a light beam as it passes through a colloid

The scattering of a light beam as it passes through a substance

The scattering of a light beam as it passes through a compound

a mixture that remains constantly and uniformly mixed and has ­particles that are so small that they cannot be seen with a microscope.

a mixture that remains constantly and uniformly mixed and has ­atoms that are so small that they cannot be seen with a microscope.

a mixture that remains constantly and uniformly mixed and has ­atoms that are so big that they cannot be seen with a microscope.

a mixture that remains constantly and uniformly mixed and has ­particles that are so big that they cannot be seen with a microscope.

the same thing as a homogeneous mixture.

the same thing as a heterogeneous mixture.

Any characteristic of a material that you can observe without changing the identity of the substance

Any characteristic of an object that you can observe without changing the identity of the substance

Any characteristic of a material that you can observe with changing the identity of the substance

A change in size, shape, or state of matter in which the identity of the substance remains the same

A change in size, shape, or state of matter in which the identity of the substance is different

A change in size, shape, or state of mass in which the identity of the substance remains the same

a mixture by evaporating a liquid and recondensing its vapor

a mixture by evaporating a solid and recondensing its matter

a mixture by evaporating a gas and recondensing its vapor

a mixture by evaporating a plasma and recondensing its matter

Any characteristic of a material that you can observe and that produces one or more new substances

Any characteristic of an object that you can observe and that produces one or more new substances

Any characteristic of a material that you can observe and that produces one or more substances

Any characteristic of a object that you can observe and that produces one new substance

A change of one substance to another

A change of a substance to another

mass of all substances that are present before a chemical change, the reactants, equals the mass of all of the substances that remain after the change, which are called the products

mass of all substances that are present before a physical change, the reactants, equals the matter of all of the substances that remain after the change, which are called the products

mass of all substances that are present before a physical change, the reactants, equals the mass of all of the objects that remain after the change, which are called the products

mass of all substances that are present before a chemical change, the reactants, equals the mass of all of the substances that remain after the change, which are called the objects

the smallest particle of an element that retains the element’s properties

the smallest particle of a compound's that retains the compound’s properties

the smallest particle of a substance that retains the substance’s properties

The small, positively charged center of the atom

The small, negatively charged center of the atom

The small, neutral charged center of the atom

particles with an electric charge of 1+

particles with an electric charge of 1-

electrically neutral particles in the nucleus; they do not have a charge

electrically neutral particles in the nucleus; they do have a charge

particles with an electric charge of 1−

particles with an electric charge of 1+

Scientists have inferred that protons and neutrons are composed of smaller particles

Scientists have inferred that protons and electrons are composed of smaller particles

Scientists have inferred that electrons and neutrons are composed of smaller particles

the area around the nucleus of an atom, where electrons are most likely to be found

the area around the nucleus of an atom, where protons are most likely to be found

the area around the nucleus of an atom, where neutrons are most likely to be found

The number of electrons

The number of protons

The number of neutrons

he sum of the number of protons and the number of neutrons

he sum of the number of protons and the number of electrons

he sum of the number of electrons and the number of neutrons

Atoms of the same element that have different numbers of neutrons

Atoms of the same element that have different numbers of protons

Atoms of the same element that have different numbers of electrons

the weighted mass of all naturally occurring isotopes of an element, measured in atomic mass units

the weighted average mass of all naturally occurring isotopes of an element, measured in atomic mass units

the weighted mass of all naturally isotopes of an element, measured in atomic mass units

the weighted average mass of all naturally isotopes of an element, measured in atomic mass units

the elements are arranged by increasing atomic number—not atomic mass—and by periodic changes in physical and chemical properties.

the elements are arranged by increasing atomic number—not atomic mass—and by physical changes in physical and chemical properties.

the elements are arranged by increasing atomic number—not atomic mass—and by chemical changes in physical and chemical properties.

The horizontal rows of elements in the periodic table

The vertical columns of elements in the periodic table

The vertical columns in the periodic table

The horizontal rows in the periodic table

consists of the chemical symbol of an element surrounded by dots to represent the number of electrons in the outermost energy level.

consists of the physical symbol of an element surrounded by dots to represent the number of electrons in the outermost energy level.

consists of the chemical symbol of an atom surrounded by dots to represent the number of electrons in the outermost energy level.

Metals

Nonmetals

Metalloids