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Worksheets

MidTerm 2 / 2nd trimester

Total questions: 35

Worksheet time: 35mins

Name
Class
Date
1.

In What type of changes the appearance changes but the composition of the substance remains the same.

a)

Physical

b)

Chemical

2.

The initial substances before with which a chemical reaction starts, are called...

a)

Reactants

b)

Products

3.

The new substances formed in a chemical reaction are called...

a)

Reactants

b)

Products

4.

Graphic representation with symbols and different parts that shows a chemical reaction

a)

A Reduction

b)

A Mathematical equation

c)

A chemical equation

5.

A process in which one or more substances change into others different substances, changing their composition.

a)

a chemical reaction

b)

a mathematical equation

c)

a chemical equation

6.

The law of conservation of mass (in a closed system) says:

a)

During a chemical reaction, atoms are destroyed. The number of atoms don't remains constant throughout the reaction.

b)

During a chemical reaction, atoms are created. The number of atoms remains constant throughout the reaction.

c)

During a chemical reaction, atoms are neither created nor destroyed. The number of atoms remains constant throughout the reaction.

7.

A substance that neutralises the action of an acid

a)

Enzima

b)

Catalyst

c)

Base

d)

Neutralizer

8.

Which of the following models best demonstrates a balanced chemical equation? (Same amount of atoms in both sides of the reaction).

a)

F

b)

G

c)

H

d)

J

9.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
10.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
11.
Is a a rusting bicycle a chemical or physical change?
a)

chemical

b)

physical

12.

A chemical reaction is when...

a)

Atoms and molecules are destroyed

b)

Atoms and molecules are created

c)

Atoms and molecules break apart and regroup to form new products

d)

Atoms and molecules go on vacation and relax a little

13.

Due to what type of chemical reactions, apple turn “brown”

a)

Combustion

b)

Redox

c)

Acid-base

d)

Synthesis

14.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
15.
2 AgNO3 + Cu --> Cu(NO3)2 + 2 Ag 
a)
single displacement
b)
double displacement
c)
decomposition
d)
synthesis
16.
2NaCl →2Na +Cl2
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
17.

An _______ reaction is when more thermal energy is absorbed than is released.

a)

endothermic

b)

endergonic

c)

exothermic

d)

exergonic

18.

An _______ reaction is when more thermal energy is released than is absorbed.

a)

endothermic

b)

endergonic

c)

exothermic

d)

exergonic

19.
A copper penny turning greenish after a few years is an example of...
a)
Chemical Change
b)
Physical Change
20.
How is a physical change different from a chemical change?
a)

There is absolutely no difference

b)

Chemical changes produce new substances due to a change in the composition while physical only change the outside.

c)

Chemical changes create and destroy matter, physical changes don't

d)

Physical changes create and destroy matter, chemical changes dont

21.

Atoms gain lose, gain, or ______electrons to get a stable outer energy level and form compounds.

a)

share

b)

split

c)

create

d)

destroy

22.
A ____________is the force that holds atoms together in a compound.
a)
Chemical Formula
b)
Chemical Reaction
c)
Chemical Bond
d)
Synthesis Reaction
23.
Ionic bonds are between...
a)
nonmetals and nonmetals
b)
carbon and oxygen
c)
metals and nonmentals
d)
hydrogen and chlorine
24.
Covalent bonds are between...
a)
two or more nonmetals
b)
sodium and chlorine
c)
metals and metals
d)
metals and nonmetals
25.
What is the name for an ion with a positive charge?
a)
cation
b)
anion
c)
onion
d)
union
26.
What is the name for an ion with a negative charge?
a)
cation
b)
anion
c)
onion
d)
union
27.
What kind of bond forms when atoms exchange electrons?
a)
ionic
b)
covalent
c)
artificial
d)
univalent
28.
What are valence electrons?
a)
sum of the protons and neutrons
b)
protons minus electrons
c)
electrons in the inner shells
d)
electrons in the outer shell
29.

In the Ph scale, an acid is confer to be from 0 to 6.9, neutral 7 and a base 7.1 to 14

a)

False

b)

True

30.

The following represents photosynthesis which happens in an open system

a)

True

b)

False

31.

The reaction between baking soda and vinegar is and example of…

a)

Redox

b)

Combustion

c)

Neutralization

32.

Which chemical reaction always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water?

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Single Replacement

33.

Which type of compound is MgCl2?

a)

Ionic

b)

Compound

c)

Metallic

34.

What type of compound is H2O?

a)

Covalent -polar

b)

Covalent-non polar

c)

Ionic

d)

Metallic

35.

Number of atoms of hydrogen in 3(NH₄)₂CrO₄

a)

4

b)

2

c)

8

d)

24

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