LONG QUIZ

I. MULTIPLE CHOICE ITEMS. Choose the letter that represents your answer for each item.
1. What does the particle model of matter suggest about the behavior of particles in a solid?
a) They move freely and are widely spaced
b) They move slowly and are tightly packed
c) They move rapidly and are loosely packed
d) They are stationary and randomly arranged
2. Which state of matter has a definite shape and a definite volume?
a) Liquid c) Solid
b) Gas d) Plasma
3. In which state of matter do particles have the most energy?
a) Solid c) Gas
b) Liquid d) Plasma
4. What happens to the particles of a substance when it is heated?
a) They move slower
b) They move faster and spread apart
c) They stop moving
d) They move slower and come closer together
5. Which process involves a liquid turning into a gas?
a) Condensation c) Melting
b) Freezing d) Evaporation
6. Which of the following is a physical change?
a) Burning paper c) Dissolving sugar in water
b) Rusting of iron d) Baking a cake
7. In a solution, the substance that does the dissolving is called the:
a) Solute c) Solution
b) Solvent d) Mixture
8. Which of the following is an example of a chemical change?
a) Ice melting c) Iron rusting
b) Salt dissolving in water d) Sugar dissolving in tea
9. What is the main purpose of conducting a scientific investigation?
a) To test a hypothesis c) To confirm a fact
b) To prove a theory d) To follow a procedure
10. Which step in the scientific method involves the analysis of data to draw conclusions?
a) Hypothesis c) Observation
b) Experiment d) Data Analysis
 11. The process of a gas turning into a liquid is called:
a) Condensation c) Melting
b) Evaporation d) Sublimation
12. In a controlled experiment, which variable is changed by the experimenter?
a) independent variable c) Control variable
b) Dependent variable d) Constant
13. Which state of matter has no definite shape but has a definite volume?
a) Gas c) Liquid
b) Solid d) Plasma
14. How does the particle model describe the particles in a liquid?
a) They are fixed in place and vibrating
b) They move quickly and are spread far apart
c) They move around but are close together
d) They are stationary and packed tightly
15. What do you call the representation of an object?
a) Scientific Model c) Mass
b) Matter d) Scientist
16. What type of change is dissolving sugar in water?
a) Physical change c) Both physical and chemical
b) Chemical change d) Neither physical and chemical
17. In a scientific investigation, what is a hypothesis?
a) A testable prediction c) A final conclusion
b) An observation d) A proven fact
18. The change of state from liquid to solid is called:
a) Melting c) Condensation
b) Freezing d) Evaporation
19. What is the role of the control group in an experiment?
a) It is not exposed to the experimental treatment and is used for comparison
b) It is the group where the variable is tested
c) It receives the highest concentration of the variable
d) It changes during the experiment
20. What is the primary purpose of the scientific method?
a) To make observations
b) To prove hypotheses
c) To conduct experiments and solve problems
d) To record data
21. Which term refers to a mixture where the particles are evenly distributed?
a) Homogeneous mixture c) Solution
b) Heterogeneous mixture d) Compound
22. What is the common name for a homogeneous mixture?
a) Element c) Solution
b) Compound d) Suspension
23. What is the basic unit of matter+?
a) Atom c) Molecule
b) Ion d) Element
24. Which of the following is a characteristic of a liquid?
a) Fixed shape and volume
b) Fixed volume but takes the shape of its container
c) Takes the shape and volume of its container
d) Neither fixed shape nor volume
25. What is a solvent in a solution?
a) The substance that is dissolved
b) The substance that does the dissolving
c) The final product of dissolving
d) A solid substance
26. Which of the following is an example of a heterogeneous mixture?
a) Sugar water c) Air
b) Saltwater d) Salad

27. What is the phase change from liquid to gas called?

a) Oil c) Sand
b) Sugar d) Wax
29. What occurs during the process of freezing?
a) Energy is absorbed
b) Energy is released
c) Particles move faster
d) Particles become more spaced out
30. What do you call a mixture where the components are not uniformly distributed?
a) Homogeneous mixture
b) Heterogeneous mixture
c) Solution
d) Colloidal suspension