Science Pre-Assessment 1

What is the first step in a scientific investigation?

• A) Analyzing data

• B) Drawing conclusions

• C) Formulating a hypothesis

• D) Making observations
  

In an experiment, which variable is intentionally changed to observe its effects?

• A) Dependent variable

• B) Control variable

• C) Independent variable

• D) Constant variable

What is the term for information gathered using your senses or instruments that extend your senses?

• A) Hypothesis

• B) Data

• C) Conclusion

• D) Theory

When conducting an experiment, why is it important to have a control group?

• A) To ensure the experiment is fun

• B) To provide a standard for comparison

• C) To make the experiment more complicated

• D) To eliminate all variables

What is the final step in the scientific method where you determine whether your hypothesis was correct or not?

• A) Analysis

• B) Formulating a hypothesis

• C) Drawing conclusions

• D) Making observations

What is the basic building block of matter that cannot be broken down into simpler substances by chemical reactions?

• A) Atom

• B) Compound

• C) Molecule

• D) Element

Which of the following is a pure substance composed of only one type of atom?

• A) Molecule

• B) Compound

• C) Element

• D) Solution

What is formed when two or more elements chemically combine in a fixed ratio?

• A) Mixture

• B) Solution

• C) Compound

• D) Suspension

Which of the following represents a mixture and not a pure substance?

• A) Oxygen gas (O2)

• B) Water (H2O)

• C) Air

• D) Sodium (Na)

If you have a substance that can be separated into two or more different substances by physical means, what do you have?

• A) Element

• B) Compound

• C) Mixture

• D) Solution