Duplicate of 7th Grade Science Semester Test

Elements are found on

Which of the following will speed up dissolving?

The elements that chemically combine to form water are flammable

The proton in an atom has a ____ charge

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

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

Carbon dioxide is an example of a heterogeneous compound

A mixture is ______________ combined

A mixture can be separated physically

What is the purpose of a control group?

Read image below

A compound is _____________ combined

Sand is soluble

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

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

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

Which law has the formula F=MA

The following is an example of a mixture

A theory tells us why

A hypothesis must be testable

The dependent variable goes on the X axis

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

What is the conclusion of this study?

Atoms contain

The dependent variable must be measurable

Which of the following is the best definition of science?

Elements ___________ be broken down into simpler types of matter

In a homogeneous mixture, the particles are

Why can an element not be separated?

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

What is the independent variable?

When compounds chemically combine, their properties change

According to the third law, for every action there is

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

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

What must you find out after conducting an experiment

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

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

The results of an experiment are known as

Science is a tool to understand the natural world

A compound is two or more different elements chemically combined

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

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

Science cannot study

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

Read image below

Who is the scientist that developed the laws of motion?

What is the dependent variable?

Water is a universal

The dependent variable depends on the independent variable

_______________ increases when compounds are formed

The neutron in an atom has a __________ charge

Is the a control on this graph?

In a _____________ the molecules are tightly packed and vibrating

Saltwater is an example of a solution

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

A law tells us why

Increasing the temperature of a solution always increases solubility

A __________________ can easily be separated

In a homogeneous mixture, you cannot differentiate between the

If a new substance is formed it is called a _______

Paper chromatography is used to separate

In a heterogeneous mixture, the particles are

In a ____________ the molecules are sliding past one another

What does the following image show?

Matter is anything that has a

An example of a physical change is

Evaporation is used to

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

Filtration is used to

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

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

Is milk homogeneous or heterogeneous?

The electron in an atom has ________ charge

It is not possible to study supernatural things in science because

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

The parts of a compound are written using a

Elements are made up of only one kinds of

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