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Grade 9 Diagnostic Test Week 3

Total questions: 25

Worksheet time: 50mins

Name
Class
Date
1.
Which of the following best describes an atom?
a)
protons and neutrons grouped together
b)
protons and electrons grouped together
c)
a core (center) of protons and neutrons surrounded by electrons
d)
a core of electrons and neutrons surrounded by protons
2.
Use the picture of an atom below to answer the question.

Which statement best describes the part of the atom that is shown by the letter B?
a)
It is an electron, and it has a negative charge.
b)
It is an electron, and it has a positive charge.
c)
It is a proton, and it has a negative charge.
d)
It is a neutron, and it has a neutral charge.
3.

Subatomic particle with a negative charge

a)

proton

b)

electron

c)

neutron

d)

nucleus

4.

Subatomic particle with no charge

a)

proton

b)

neutron

c)

electron

d)

nucleus

5.

Subatomic particle with a positive charge

a)

proton

b)

neutron

c)

electron

d)

isotope

6.

The smallest unit of matter that retains the identity of a substance

a)

atom

b)

isotope

c)

proton

d)

nucleus

7.
Cobalt (Co) has 27 protons in each atom. Based on this information, which of the following also describes an atom of Cobalt?
a)
It has no neutrons.
b)
It has 27 electrons.
c)
It has 13 neutrons and 14 electrons.
d)
It has a total of 86 neutrons and electrons.
8.
What makes an atom have a positive charge?
a)
more electrons than protons
b)
more neutrons than electrons
c)
more protons than electrons
d)
less protons than electrons
9.
All atoms of an element have the same number of _____________.
a)
neutrons
b)
electrons
c)
protons
d)
atomic mass
10.

A substance that cannot be separated or broken down into simpler substances by chemical means is?

a)

Mixture

b)

Element

c)

Compound

d)

Molecule

11.

Any combination of two or more atoms that are chemically combined is called this.

a)

molecule

b)

compound

c)

element

d)

pure substance

12.

This is any combination of two or more atoms from different elements that are chemically combined.

a)

compound

b)

molecule

c)

element

d)

pure substance

13.

The basic building blocks of the universe. The smallest and most pure substances that can be found.

a)

elements

b)

atoms

c)

molecules

d)

compounds

14.

This is what holds atoms in a molecule and compound together. They can be ionic, covalent, or metallic (and you'll learn about these in high school chemistry).

a)

chemical bond

b)

chemical formula

c)

chemical symbol

d)

electron cloud

15.
How are covalent bonds formed?
a)
Sharing of electrons
b)
Transfer of electrons
16.

When atoms bond it is called a ___________________ because they make a new substance.

a)

chemical reaction

b)

physical reaction

17.

Covalent Bonds ______________ valence electrons.

a)

give

b)

take

c)

keep

d)

share

18.
A _______ is a charged particle because it has more or fewer electrons than protons.  When an atom _____ an electron, it becomes a positively charged ion.  When an atom ____an electron, it becomes a negatively charged ion.
a)
isotope, gains, loses
b)
isotope, loses, gains
c)
ion, loses, gains
d)
ion, gains, loses
19.
What kind of bond forms when atoms exchange electrons?
a)
ionic
b)
covalent
c)
artificial
d)
univalent
20.
If an atom loses two electrons what charge will it have?
a)
-2
b)
-1
c)
+1
d)
+2
21.
If an atom gains two electrons what charge will it have?
a)
-2
b)
-1
c)
+1
d)
+2
22.

Water exists in this forms :

a)

Gas

b)

Plasma

c)

Liquid

d)

Solid

23.

Water is a compound that consist of 3 atom which is 2 atom oxygen and 1 atom hydrogen

a)

True

b)

False

24.

Water has a slightly positive end AND a slightly negative end, this means water has

a)

polarity

b)

cohesion

c)

adhesion

d)

specific heat

25.

The temporary bonds that form between the Positive Oxygen and the Negative Hydrogens between two water molecules is called a...

a)

Hydrogen Bond

b)

Covalent Bond

c)

Ionic Bond

d)

James Bond

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