FIRST QUARTER SCIENCE 7 REVIEWER

You water three tomato plants with sugar water. Each plant receives a different concentration of sugar solutions. A fourth plant receives pure water. After a two-week period, the height is measured. What is the manipulated or independent variable?

• different concentration of sugar solutions

• height of tomato plants

• plant type

• time

In an experiment, which of the following is measured for its observable changes?

• independent variable

• controlled variable

• constant variable

• dependent variable

Which of the following DOES NOT belong to the group?

• SIlver (Ag)

• Muriatic acid (HCl)

• Table salt (NaCl)

What does this diagram represent?

• compounds

• mixture of elements

• mixture of compounds

• mixture of compounds and element

A student is observing a substance that contains multiple element that have been chemically combine C₆H₁₂O₆(SUGAR). Which of the following best describes what the student is observing?

• Heterogeneous Mixture

• Homogeneous Mixture

• Element

• Compound

This picture represents which of the following?

• element
• compound
• mixture
• atom

This part of the experiment serves as a basis of comparison:

• control group

• Independent variable

• dependent variable

• data

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

• dependent variable

• independent variable

• data

• control group

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 ...

• type of plant

• the amount of sunlight

• the type of music

• the type of liquid

An experiment was carried out to determine whether drinking caffeinated soda increases pulse rate. The pulse rates of two groups of people at rest were measured. Group A was then given caffeinated soda and group B was given caffeine-free soda. One hour after drinking the soda, the pulse rates were measured. The participants in the experiment were all the same age, and they were all given the same amount of soda. The dependent variable in this experiment is the

• type of soda given to each group

• amount of soda given to each group

• pulse rate of each group

• age of participants in each group