7th Grade Science Semester Test

Pure water (H2O) is an example of a homogeneous mixture

You want to separate iron fillings from rocks underwater. What should you use?

Read image below

_______________ increases when compounds are formed

A point on the line of a solubility curve indicates the solution is

The parts of a compound are written using a

Mixing, temperature, and heat are all examples of things that can decrease solubility

Do angels and demons exist? (Can science answer this question?)

A mixture can be separated physically

The results of an experiment are known as

What is the purpose of a control group?

The neutron in an atom has a __________ charge

What is the dependent variable?

The dependent variable goes on the X axis

In a homogeneous mixture, you cannot differentiate between the

The independent variable is the variable that the scientist changes in an experiment

In a heterogeneous mixture, the particles are

Who is the scientist that developed the laws of motion?

Evaporation is used to

The number of _______________ in an atom tell you what element it is

A _____________ change is defined as a change from one state of matter to another

What must you find out after conducting an experiment

If an element has 8 protons, which element is it?

Is milk homogeneous or heterogeneous?

Evaporation, filtration and magnetic attraction are all methods of separating mixtures

What does the following image show?

The dependent variable must be measurable

What is the conclusion of this study?

In a solution, the substance that does the dissolving is called the

The electron in an atom has ________ charge

Elements are made up of only one kinds of

Which law explains why a picture hanging on a wall does not move?

In a ______________ the molecules bounce off of the container that they are in

What is the independent variable?

It is not possible to study supernatural things in science because

Paper chromatography is used to separate

In a _____________ the molecules are tightly packed and vibrating

If a new substance is formed it is called a _______

In a homogeneous mixture, the particles are

Which law has the formula F=MA

A solution that contains more than the normal amount of solute than it can hold is called a

A theory tells us why

If you wanted to separate crystals from a saltwater solution, which would you use?

If matter changes from a solid, to liquid, to gas, how has energy changed?

According to Newton's first law, an object in motion will stay in motion unless

In our milk lab, we dissolved food coloring into milk. Milk was our

Why can an element not be separated?

The elements that chemically combine to form water are flammable

An example of a physical change is

Which of the following is the best definition of science?

Carbon dioxide is an example of a heterogeneous compound

Matter is anything that has a

Read image below

Science is a tool to understand the natural world

Increasing the temperature of a solution always increases solubility

The following is an example of a mixture

The proton in an atom has a ____ charge

In an unsaturated solution, more solute can be added an dissolving will occur

A hypothesis must be testable

Filtration is used to

A law tells us why

According to the third law, for every action there is

You find a substance in nature that has a new number of protons. You have just discovered a

The dependent variable depends on the independent variable

Which of the following will speed up dissolving?

In a ____________ the molecules are sliding past one another

Saltwater is an example of a solution

A mixture is ______________ combined

A compound is _____________ combined

Is the a control on this graph?

Atoms contain

Sand is soluble

Elements are found on

A __________________ can easily be separated

Water is a universal

A compound is two or more different elements chemically combined

When compounds chemically combine, their properties change

Elements ___________ be broken down into simpler types of matter

Science cannot study