anything that has mass and takes up space

Water is a molecule made up of

two hydrogen atoms and one oxygen atom bond

is the smallest piece of matter that has the properties of an element

the motion of atoms in a substance as its temperature increases

all knowledge learned from experiments.

Which of the following is true of all chemical reactions?

They break and re-form chemical bonds

the measurements and observations gathered from an experiment

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Unit 1 Grade 7 Practice Test

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Questions 15

Answers

1
All of the following are examples of exothermic reactions EXCEPT
Hydrogen peroxide mixed with yeast
Vinegar mixed with Baking Soda
Bioluminescence in animals that live in the oceans
When you light a match the light
2
Matter is
is a measure of the amount of matter that makes up an object or substance
is an observable or measurable characteristic of a substance
is the amount of mass in a unit volume of substance
anything that has mass and takes up space
3
The independent variable is
is a constant
isolated during experiment to ensure the results are vaild
what happens as a result of the control variable
what the scientist changes
4
Energy that is stored in the bonds holding together atoms and molecules is called
Chemical Energy
Thermal Energy
Physical Energy
Conservation of mass
5
An atom is made up of
Protons
Electrons
Neutrons
All of the above
6
Water is a molecule made up of
None of the above
two oxygen atoms bonded together
two hydrogen atoms and 3 oxygen atoms
two hydrogen atoms and one oxygen atom bond
7
The scientific process always begins with a.....
research
experiment
question
hypothesis
8
An atom
is the size, extent, or relative to something else
is the smallest piece of matter that has the properties of an element
is anything that has mass and takes up space
is a synthetic material that is made from aluminum metal
9
Thermal energy is
the motion of atoms in a substance as its temperature increases
none of the above
a combination of two or more atoms bonded together
a change of state
10
Scientists follow a process that provides them with a (blank) to work through the question.
structure
logical framework
data
experiment
11
Metalloids are also called
poor conductors
none of the above
semiconductors
good conductors
12
Science is
all knowledge learned from experiments.
the normal action of something or how something works
is a tool that both scientists and engineers
a substance that is designed to be used for applications
13
Important scientist that organized the Periodic Table of elements is
Dmitri Mendeleev
Isaac Newton
None of the above
Ken Griffey Jr.
14
Which of the following is true of all chemical reactions?
They break and re-form chemical bonds
They destroy the atoms of the reactants to produce the new products.
They create new elements
They cause liquid substances to turn into a gas
15
Data is
is something that happens in a regular and repeated way
is a specific procedure that test hypothesis
the measurements and observations gathered from an experiment
none of the above

Unit 1 Grade 7 Practice Test Flashcards | StudBud