Introduction to Chemistry

What is the study of chemistry mainly concerned with?

• Weather conditions

• Matter and its changes

• Human anatomy

• Motion of planets

Which of the following is NOT an example of matter?

• Chair

• Water

• Heat

• Salt

The basic building block of all matter is the:

• Molecule

• Atom

• Mixture

• Element

Which of these is a chemical change?

• Ice melting

• Sugar dissolving in water

• Paper burning

• Breaking a glass

Which branch of chemistry deals with non-carbon compounds?

• Inorganic chemistry

• Organic chemistry

• Physical chemistry

• Biochemistry

The first step in the scientific method is:

• Testing the hypothesis

• Making an observation

• Drawing conclusions

• Communicating results

A hypothesis is:

• A permanent fact

• A testable explanation

• A law of nature

• A random guess

A statement that summarizes many experimental results and can predict future outcomes is called a:

• Hypothesis

• Scientific law

• Theory

• Observation

Which of the following is a qualitative observation?

• The ball has a mass of 10 g

• The liquid is colorless

• The rod is 5 cm long

• The temperature is 25°C

Why is it important to repeat experiments?

• To confuse others

• To waste time

• To confirm accuracy

• To get new ideas