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مراجعة احياء للصف 9 - Biology Review for Grade 9

Total questions: 61

Worksheet time: 58mins

Name
Class
Date
1.
Which part of an atom is POSITIVELY charged?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
2.
What part of an atom is NEGATIVELY charged?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
3.
Which part of an atom has no charge?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
4.
What is the picture displayed?
a)
Atom
b)
Element
c)
Molecule
d)
Compound
5.

What is the picture displayed?

a)

atom

b)

element

c)

compound

6.
What is the picture displayed?
a)
atom
b)
element
c)
molecule
d)
compound
7.
What is at the center of every atom?
a)
An electron
b)
A compound
c)
A nucleus
d)
A molecule
8.
Which two particles make up the nucleus of an atom?
a)
protons and electrons
b)
protons and neutrons
c)
molecules and compounds
d)
neutrons and electrons
9.

Which of the following cannot be broken down into something simpler?

a)

A compound

b)

An element

c)

A mixture

10.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

6

11.
What do we call a chemical substance made up of 2 or more different types atoms bonded together?
a)
formula
b)
atom
c)
subscript
d)
compound
12.

How many Hydrogen atoms are present in H20?

a)

2

b)

4

c)

1

d)

0

13.
Carbon dioxide is formed when two oxygen atoms chemically combine with a carbon atom. Which term best describes carbon dioxide?
a)
atom
b)
mixture
c)
element
d)
compound
14.
When salt is dissolved in water, the result is a
a)
homogeneous mixture
b)
gas
c)
compound
d)
heterogeneous mixture
15.
What is the charge on a proton? 
a)
positive
b)
neutral
c)
negative
16.
What is the charge of an electron? 
a)
positive
b)
neutral
c)
negative
17.

This is a one or two letter representation of each element that is generally close to the element's name. The first letter of this will ALWAYS be capitalized.

a)

chemical symbol

b)

chemical number

c)

atomic number

d)

atomic mass

18.
How are covalent bonds formed?
a)
Sharing of electrons
b)
Transfer of electrons
19.
Why do elements bond?
a)
To be friends
b)
To create a new element
c)
To become stable
20.

Covalent Bonds ______________ valence electrons.

a)

give

b)

take

c)

keep

d)

share

21.
What kind of chemical bond forms between a metal and a nonmetal?
a)
ionic
b)
covalent
c)
fake
d)
metallic
22.
What kind of bond forms between two nonmetals?
a)
ionic 
b)
covalent
c)
metallic
d)
fake
23.
What kind of bond forms when atoms exchange electrons?
a)
ionic
b)
covalent
c)
artificial
d)
univalent
24.
If an atom loses two electrons what charge will it have?
a)
-2
b)
-1
c)
+1
d)
+2
25.
If an atom gains two electrons what charge will it have?
a)
-2
b)
-1
c)
+1
d)
+2
26.
What happens when a sodium atom loses an electron?
a)
0
b)
-1
c)
+1
d)
-2
27.
A _________________ is composed of symbols and subscripts indicating the number of atoms of an element in a compound.
a)
Chemical Equation
b)
Chemical Reaction
c)
Synthesis Reaction
d)
Chemical Notation
28.

For metals (groups 1-3), its easier to _____ electrons to have a full outer shell.

a)

gain

b)

lose

c)

share

29.

For nonmetals (grousp 5-7), its easier to _____ electrons to have a full outer shell.

a)

gain

b)

lose

c)

share

30.

Ice has less density as compared to water due to ___________ bonds.

a)

ionic

b)

hydrogen

c)

covalent

d)

metallic

31.

Water molecules tend to make _____________ bonds with each other.

a)

ionic

b)

polar covalent

c)

metallic

d)

hydrogen

32.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
33.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
34.

How many reactants are in A + B ---> C ?

a)

1

b)

2

c)

3

d)

4

35.

How many products are in A + B ---> 2C

a)

1

b)

2

c)

3

d)

4

36.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
37.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
38.
This is used to represent the number of each atom being represented. 
a)
A Exponent
b)
The Coefficient
c)
A Molecule
d)
The Subscript
39.
This appears on the left side of a chemical formula, and represents how many molecules there are. 
a)
An Atom
b)
The Subscript
c)
A Molecule
d)
The Coefficient
40.
Evidence of Chemical Change.
a)
New Substance 
b)
Size change
c)
State change
d)
Mixture 
41.
Water boiling is a _______ change. 
a)
Physical Change 
b)
Chemical Change 
42.
Fireworks Exploding are a ________ change.
a)
Physical Change
b)
Chemical Change
43.
A chemical reaction accompanied by the absorption of heat. 
a)
Chemical Change
b)
Physical Change
c)
Endothermic Reaction
d)
Exothermic Reaction 
44.
A cold pack made with Ammonium Chloride is and example of a __________ reaction. 
a)
Endothermic Reaction
b)
Exothermic Reaction
c)
Mesothermic Reaction
d)
Misothermic Reaction
45.
A chemical reaction accompanied by the releasing of heat. 
a)
Endothermic
b)
Exothermic
c)
Mesothermic
d)
Misothermic
46.
What does "polar" mean?
a)
A molecule is cold
b)
A molecule has ionic bonds
c)
A molecule has covalent bonds
d)
A molecule has areas of positive and negative charge
47.
When two substances are mixed, the substance that is dissolved is called the:
a)
solvent
b)
solute
48.
When two substances are mixed, the substance that does the dissolving is the:
a)
solvent
b)
solute
49.

Mixtures where you can see the separate parts are called ____________________.

a)

heterogenous mixtures

b)

homogeneous mixtures

c)

solutions

d)

colloids

50.

What type of mixture is this?

a)

heterogeneous mixture

b)

homogeneous mixture

c)

solution

d)

colloid

51.

Peanut butter is a type of __________________ because you can see its parts by looking under a microscope.

a)

homogeneous mixture

b)

suspension

c)

colloid

52.

A solution that will NOT settle when it is left untouched is a _________________________.

a)

heterogeneous mixture

b)

homogeneous mixture

c)

colloid

d)

solution

53.

Mayonnaise is a ________________________.

a)

heterogeneous mixture

b)

solution

c)

homogeneous mixture

d)

colloid

54.

Another name for a homogeneous mixture is a ______________________.

a)

solution

b)

suspension

c)

colloid

55.

If you dissolve salt into water, which one is the SOLVENT?

a)

salt

b)

water

56.

If you dissolve salt into water which one is the SOLUTE?

a)

salt

b)

water

57.

Which one is NOT a heterogeneous mixture?

a)

a salad

b)

air

c)

muddy water

d)

a variety pack of candy

58.

Neutral solutions have a pH of:

a)

0

b)

1

c)

7

d)

14

59.

Which is true?

a)

pH of less than 7 is basic; pH of more than 7 is acidic

b)

pH of less than 7 is acidic; pH of more than 7 is basic

60.

NaOH may be found in drain cleaners and as a component of soaps. Is NaOH an acid or a base?

a)

Acid

b)

Base

c)

Neither (Neutral)

61.

Is pure water acidic, basic, or neutral?

a)

Acidic

b)

Basic

c)

Neutral

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