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Grade 9: Introduction to chemistry

Total questions: 80

Worksheet time: 47mins

Name
Class
Date
1.

What is meant by chemistry?

a)

Studies the structures of matters.

b)

Studies the structures and composition of matters.

c)

Studies the structures , composition and properties of matters.

d)

Studies the structures , composition, properties and interaction of matters.

2.

The following are the chemicals used in daily life EXCEPT

a)

Sugar

b)

Paint

c)

Detergent

d)

Sound

3.

The picture beside shows the __________of an ozone.

a)

properties

b)

sructure

c)

interaction of matter

4.

A bacteria is an organism to be viewed _______ , while a flower is an organism to be viewed _______.

(a)  

5.

What is the study of the study of the composition, structure, and properties of matter, the processes that matter undergoes, and the energy changes that accompany these processes

(a)  

6.

Measuring mercury in seawater is an example of?

a)

Physical Chemistry

b)

Inorganic Chemistry

c)

Analytical Chemistry

d)

Organic Chemistry

7.

Which branch of chemistry would be most concerned with synthesizing new carbon-containing compounds?

a)

Physical Chemistry

b)

Inorganic Chemistry

c)

Analytical Chemistry

d)

Organic Chemistry

8.

The thinning of the ozone layer is also known as the

a)

ozone hole

b)

ozone gap

c)

ozone space

d)

ozone void

9.

Ozone is formed in the

a)

troposhere

b)

stratosphere

c)

mesosphere

d)

thermosphere

10.

What is the correct equation for the breakdown of ozone?

a)

O3 + UV ---> O3 + energy

b)

O3 + UV ---> O2 + O

c)

O2 + O + UV ---> O3

d)

Ozone cannot be broken down

11.

The branch of chemistry that deals with laws and theories to understand structure and changes of matter is called ________________

a)

Analytical Chemistry

b)

Industrial Chemistry

c)

Physical Chemistry

d)

Nuclear Chemistry

12.

Study of paint is an example of

a)

Biochemistry

b)

Analytical chemistry

c)

Physical Chemistry

d)

Industrial Chemistry

13.

The branch of chemistry that deals with elements and their compounds except organic compounds is called

a)

Organic Chemistry

b)

Inorganic chemistry

c)

Analytical Chemistry

d)

Physical Chemistry

14.

The study of carbon containing compounds.

a)

Organic Chemistry

b)

Inorganic Chemistry

c)

Physical Chemistry

d)

Biochemistry

15.

The study of the properties and changes in matter and their relation to energy.

a)

Physical Chemistry

b)

Biochemistry

c)

Organic Chemistry

d)

Inorganic Chemistry

16.

The identification of the components and composition of materials refers to___________________________

a)

Biochemistry

b)

Physical Chemistry

c)

Organic Chemistry

d)

Analytical Chemistry

17.

The study of substances and processes occurring in living things.

a)

Biochemistry

b)

organic Chemistry

c)

inorganic Chemistry

d)

Applied Chemistry

18.

____________ is the branch of chemistry that would identify enzymes and determine reaction mechanisms for biochemical reactions.

a)

Organic Chemistry

b)

Biochemistry

c)

Physical Chemistry

d)

Analytical Chemistry

19.

____________ is the branch of chemistry that would study and develop new materials to improve existing products or make new ones that in general do no contain carbon.

a)

Organic Chemistry

b)

Inorganic Chemistry

c)

Biochemistry

d)

Physical Chemistry

20.

____________ is the branch of chemistry that would analyze new chemicals made from carbon-containing building blocks to identify its properties and use. (Select all that apply.)

a)

Inorganic Chemistry

b)

Organic Chemistry

c)

Biochemistry

d)

Analytical Chemistry

21.

____________ is the branch of chemistry that would analyze the composition of medicines and research how it reacts in the body. (Select all that apply)

a)

Analytical Chemistry

b)

Organic Chemistry

c)

Biochemistry

d)

Inorganic Chemistry

22.
The study of chemicals that, in general, do not contain carbon. 
a)
applied chemistry
b)
inorganic chemistry
c)
organic chemistry
d)
biochemistry
23.

Identifies an unknown through by determining its composition.

a)

analytical

b)

physical

c)

organic

d)

biochemistry

24.

studying the process of photosynthesis in plants

a)

biochemistry

b)

inorganic

c)

analytical

25.
Something that takes up space and has mass.
a)
volume
b)
matter
c)
mass
d)
density
26.
The amount of space something takes up
a)
density
b)
volume
c)
mass
d)
matter
27.

Which among the following is a NOT MATTER?

a)

Mars

b)

Smoke

c)

Steam

d)

none of the choices

28.

Which branch of Science is related with "Chemical reactions"?

a)

Physics

b)

Biology

c)

Chemistry

29.

____________ is the branch of chemistry that would analyze new chemicals made from carbon-containing building blocks to identify its properties and use.

(Select all that apply.)

a)

Inorganic Chemistry

b)

Organic Chemistry

c)

Biochemistry

d)

Analytical Chemistry

30.

Studying the refining process of metallic ores (rocks).

a)

Physical Chemistry

b)

Inorganic Chemistry

c)

Analytical Chemistry

31.

Which among the following is a NOT matter?

a)

Air

b)

Gold

c)

Water

d)

Heat

32.
The summary at the end of an experiment that explains the results is... 
a)
conclusion
b)
procedures
c)
materials
d)
responding variable
33.
A testable prediction about a scientific investigation is a(n)
a)
Question
b)
Observation
c)
Hypothesis
d)
Experiment
34.
A series of steps used by scientists to solve a problem or answer a question. 
a)
scientific method
b)
recipe
c)
data collection
d)
metric system
35.

The variable that is being measured or observed is called the _______________. Hint: this is the variable that is the result or effect

a)

independent variable

b)

dependent variable

c)

control variable

36.
If I ride my bike to school instead of walking, then I will get to school faster. What is the dependent variable?
a)
True
b)
How fast you get to school
c)
Riding a bike or walking
d)
False
37.

The independent variable is

a)

The variable that you change in an investigation

b)

The variable that you measure in an investigation

c)

A variable that you keep the same in an investigation

38.

The process of obtaining information by using the senses is called a/an

a)

Conclusion

b)

Observation

c)

Inquiry

d)

Scientific method

39.

What is a physical or mental representation of an object or an event?

a)

a theory

b)

a hypothesis

c)

a model

d)

a scientific law

40.

Data gathered using the senses are referred to ___________.

a)

quantitative data

b)

logical data

c)

measured data

d)

qualitative data

41.

An explanation based on many repeated observations during experiments.

a)

conclusion

b)

scientific law

c)

theory

d)

hypothesis

42.

A general statement that describes a patterns that are often observed in nature.

a)

logical law

b)

civil law

c)

moral law

d)

scientific law

43.

Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground.

What is the dependent variable?

a)

Dropping the same way

b)

Wing Length

c)

Amount of time it takes the helicopter to hit the floor

d)

Dropping from the same height

44.

Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground.

What is the independent variable?

a)

Dropping the same way

b)

Wing Length

c)

Amount of time it takes the helicopter to hit the floor

d)

Dropping from the same height

45.

Cindy wanted to find out how the amount of sunlight affects the growth of plants. She placed two tomato plants in 10 inch pots with potting soil and watered them ¼ cup each day. One plant was placed under a cardboard box and one was placed in the sunlight. She measured the growth of the plant each week for three weeks.

What are two CONSTANTS? (Select 2)

a)

Using the same type of plant

b)

Each plant was placed in a 10 inch pot

c)

The growth of the plant

d)

One plant is in the sunlight and the other is under a box

46.
What would the INDEPENDENT variable be in an experiment testing which  paper airplane design goes furthest?
a)
the paper used
b)
the paper airplane design
c)
the distance of each plane's flight
d)
how hard the plane is thrown
47.

A possible explanation to a problem that has not yet been tested. 

a)

data

b)

theory

c)

hypothesis

d)

fact

48.

This variable in an experiment is the one being deliberately changed by the scientist. 

a)

dependent variable

b)

independent variable

c)

data

d)

control group

49.

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

a)

The type of plant

b)

The amount of sunlight

c)

The type of music

d)

The type of liquid

50.

The summary at the end of an experiment that explains the results. 

a)

conclusion

b)

procedures

c)

materials

d)

responding variable

51.

The following is are types of research based on the purpose except.

a)

Correlational

b)

Descriptive

c)

Action

d)

Pure Research

52.

Which of these contains steps in the right order?

a)

Ask a question, research, state your hypothesis, experiment, analyze, draw a conclusion

b)

State your hypothesis, ask a question, research, experiment, analyze, draw a conclusion

c)

State your hypothesis, ask a question, research, draw a conclusion, experiment, analyze

d)

Ask a question, state your hypothesis, research, experiment, analyze and draw a conclusion, share the results

53.

A series of steps used by scientists to solve a problem or answer a question.

a)

Hypothesis

b)

Scientific method

c)

Data collection

d)

Experiment

54.

What is the first step in the scientific method?

a)

Make a hypothesis

b)

Test the experiment

c)

Draw conclusions

d)

Ask a question/make an observation

55.

The following is NOT a step in the scientific method.

a)

Share conclusions with others

b)

Make predictions

c)

Collect data

d)

State a theory

56.

Which happens last?

a)

Ask a question/make an observation

b)

Make a hypothesis

c)

Make a plan

d)

Draw conclusions

57.

To make observations you use your _______.

a)

Feet

b)

Experience

c)

Senses

d)

Smile

58.

Performing a test or experiment allows you to test your ___________.

a)

Conclusions

b)

Hypothesis

c)

Data

d)

Question

59.

The _____ _______ is the factor that you purposely change or control in order to see what effect it has.?

a)

dependent variable

b)

indipendent variable

c)

qualitative data

d)

quantitative data

60.

What you learned from the experiment is the ___.

a)

Conclusion

b)

Materials

c)

Variable

d)

Hypothesis

61.

If you conduct an experiment where you place 5 of the same red candies in different types of soda, all in the same amount of liquid and same type cups the indipendent variable is what? 

a)

Kind of soda

b)

Type of cup

c)

Amount of soda

d)

Color of candy

62.

What is the purpose of the scientific method?

a)

To solve problems and create experiments

b)

To research new information

c)

To practice safety

d)

To become a scientist

63.

Which is a good example of a hypothesis for the following scientific question, "Does playing violent video games lead to higher blood pressure?"

a)

Playing violent video games gives people higher blood pressure.

b)

If you have higher blood pressure, then you play violent video games.

c)

If you play violent video games you will have higher blood pressure.

d)

If you play violent video games, then you will have higher blood pressure.

64.

Why is the following considered a bad hypothesis? "If your plants grew taller, then they were given fertilizer."

a)

It doesn't have "if" and "then"

b)

The prediction is wrong

c)

The independent and dependent variable are in the wrong order

d)

This is a good hypothesis

65.

Jennifer wants to know if students do better on their homework if they listen to classical music or hip hop music. What is the independent variable in this experiment?

a)

Students' grades on homework

b)

The age of the students

c)

The volume of the music

d)

The type of music

66.

A dependent variable is __________.

a)

What is measured in an experiment

b)

What you change in an experiment

c)

A prediction about an experiment

d)

What stays the same in an experiment

67.

A qualitative observation is ________.

a)

Describing qualities and characteristics

b)

A guess you make using an observation

c)

Numbers and labels

d)

What is kept the same in an experiment

68.

What is a quantitative observation?

a)

Describes qualities and characteristics

b)

A guess you make using an observation

c)

Numbers and labels

d)

What is kept the same in an experiment

69.

How many independent variables should you have in an experiment?

a)

two

b)

as many as possible

c)

four

d)

one

70.

Joe tells Gabby his theory about why sea turtles nest on the beach instead of in the ocean. He says, “The turtle eggs would sink to the bottom of the ocean, and the baby turtle would drown. I know this because my uncle is a fisherman, and he told me this information. Gabby tells Joe that his theory is not scientific. Why does Joe’s idea not meet the requirements to be a scientific theory?

a)

Joe’s idea is already a scientific law.

b)

Joe’s idea is not supported by scientific evidence.

c)

Joe’s idea is a good guess that can be tested by experiments.

d)

Joe and his uncle are not scientists.

71.

The law of universal gravitation states that both mass and distance of objects affect the gravitational force between them. Gravitational force increases as the mass of the objects increase. Gravitational force decreases as distance between the objects increases. Why are these statements considered scientific law, and not scientific theory?

a)

The statements tells what happens, and not why it happens.

b)

The statements involve mass and distance measurements.

c)

The statements explain the attractive force between two objects.

d)

The statements predict what will happen under certain conditions.

72.

Lilly was trying to explain to her friend the difference between a theory and a law in science. She used the theory of plate tectonics and the law of superposition as examples. Lilli explained the difference by using non-scientific language. Which statement could Lilly use to correctly describe the difference between a theory and a law in science?

a)

A theory describes a natural event, while a law explains it.

b)

A theory explains a natural event, while a law predicts it.

c)

A theory explains a natural event, while a law describes it.

d)

A theory predicts a natural event, while a law explains it.

73.

Which of these can change when new evidence is presented?

a)

theory

b)

law

74.

Which of these can be represented mathematically and provide no explanation why a phenomenon occurs?

a)

theory

b)

law

75.
What is a law?
a)
Describes what happens
b)
Explains a process
76.

Universal ______ of Gravitation: any 2 objects have a force of gravity between them. Tells what happens when 2 objects are near each other.

a)

Theory

b)

Law

77.

Theory or law: Atomic _____ of matter: all matter is made up of atoms. Explains why matter behaves a certain way.

a)

Theory

b)

Law

78.

Sir Isaac Newton was sitting under an apple tree one day when an apple hit him on the head. He wondered why the apple fell and eventually developed what became the law of gravity. Why is gravity considered a scientific law and not a scientific theory?

a)

The law of gravity describes the attraction between particles in the universe.

b)

The law of gravity explains why the particles attract each other.

c)

Gravity is not a law, it is a theory

d)

The law of gravity explains why the apple hit him on the head.

79.

Which choice best explains why the scientific model of the atom has changed over time?

a)

The discovery of new evidence resulted in changes to the atomic theory.

b)

Advancements in atomic models proved the atomic theory was accurate.

c)

The atomic theory was modified with the discovery of a new element.

d)

Changes in atomic models show that the atomic theory was based on opinion.

80.

How can laws be expressed?

a)

By experiments

b)

Groupings

c)

Mathematical Equations

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