Answer Key
Mult choice
Choose the correct answer
1. What is a type of matter with a fixed composition?
A. suspensions
B. compound
C. Substance
2. If all atoms in a substance have the same identity, what are they called?
A. element
B. compound
C. substance
3. Atoms of two or more elements are combined in a fixed proportion form what?
A. compound B. substance C. element
4. What are Heterogeneous mixtures?
A. Granite B. liquid C. gas
5. What are Homogeneous mixtures?
A. gas B. rock C. a dog
6. What are particles so small that cant be seen with a microscope?
A. solutions B.Colloid C. element
7. What is a substance?
A. always an element B. always a compound C. either an element or a compound
8. Which of the following is a compound?
A. air
B. blood
C. water
9. Which is a substance in which all the exact combinations of elements are always the same?
A. synthetic element B. compound C. mixture
10. The silvery liquid used in thermometers called mercury is a______?
A. compound B. element C. mixture
11. Which of the following is a substance?
A. milk B. water C. vinegar
12.Which of the following is a homogeneous mixture?
A. milk B. cat C. soft drink
13. Which of the following is a solution?
A. salt water B. milk C. muddy water
14. What is a mixture that particles are so small cant be seen with a microscope?
A. solution B. element C.water
15. ______ is a material made up of two or more materials.
A. element B. compound C. mixture
16. The proportions of substance on a mixture______
A. are always the same for each B. are always equal for each substance in a mixture C. can very among
the substance
17. Which of the following is homogeneous?
A. dry soup B. cheese on a pizza C. concrete
18. If you use a microscope in order to see it, what substance is it?
A. heterogeneous B. solution C. dog
20. Which of the following is a colloid ?
A. smoke B. oxygen C. vinegar
Answer the following in complete sentences.
21. How is the compound similar to a homogeneous mixtures ? how is it different?
22. Give two examples of a substance and a mixture.
Rock, gas; Elements and water
23. Describe the difference between colloids and suspension.
24. Why do the words shake well before indicate that the fruit juice is suspension?
25. Compare and contrast in terms of suspension and colloids, compare and contrast a glass of milk and
a glass of fresh-squeezed orange juice.
26. Explain how the appearance of the items is different the items are copper and a rock.
27. How is chalk different from the granite in relation to compounds and mixtures?
28. What is fog?
Water Vapor in the air.
29. What happens to the headlights of a car when they shine through fog?
30. What is a colloid mixture, and what are some examples of them.
31. What is the scattering of light by colloidal particles and how does this happen?
32. Define both a substance and a mixture and give 2 examples of both.
33. Define elements and compounds and give an example of both.
34. What is a pure substance and give an example of it.
35. Why does gold make a good coating to put on space machines?