How many oxygen atoms are there in the molecule C 12 H 22 O 11 ?

Answer 11 (eleven)

2. A substance that cannot be broken down into simpler substances is _________.

Answer An element

3. Knowing the chemical properties of a substance will tell you how the substance ______.

Answer React with other substances

4. The chemical formula for water means that each water molecule contains_____

Answer Two hydrogen atoms and one oxygen atom

5. Which state of matter will hold its shape without a container?

Answer solid

6. A liquid changes rapidly into a gas at the liquid’s ______.

Answer Boiling point

7. Which of the following is NOT an example of a physical property? Choices: freezing point, boiling point, reactivity, or density

answer reactivity

8. Matter is defined as __.

Answer: Anything that takes up space (volume) or has mass.

9. Which of the following is an example of a gas-liquid mixture? Choices: Air we breathe, a carbonated drink, a helium balloon, or ice cubes

Answer A carbonated beverage

10. Digesting food is an example of ____ change.

Answer: chemical

11. Which of the following is an example of a physical change Choices: dissolving salt in water, burning wood into charcoal, cooking an egg, or rusting iron

Answer Dissolving salt in water

12. A molecule of water is made from ____ combining 2 hydrogen atoms and one oxygen atom. Choices: physically, ionically, thermally, or chemically

answer chemically

13. A physical property of gold is its _____ Choices: density, reactivity with powerful acids, or non-flammability

answer density

14. You put one gram of salt into one liter of water and stir. The resulting liquid is an example of ___,

answer Solution (most precise answer)

15. Grinding quartz crystals down to produce sand is an example of a _____.

answer Physical change

16. A mixture of flour and water is called a ___ mixture because the substances do not dissolve.

answer Suspension (most precise answer)

17. The ___ of a substance is defined as its mass divided by its volume.

answer density

18. Aluminum, oxygen, and carbon are examples of ___.

Answer Elements

19. Each molecule of iron oxide, Fe 2 O 3 contains ___ atoms of iron.

answer two

20. A change in color during a reaction is often a sign that a ___ has occurred

answer Chemical reaction (chemical change)

21. We inhale oxygen and exhale carbon dioxide as a result of a ___ change in our bodies.

answer chemical

22. Sound is NOT made of matter because it has no ___.

answer mass

23. The chemical symbol O stands for the element ___.

answer Oxygen (not capitalized) watch spelling!

24. A substance that is made of atoms of more than one type bound together is called a ___.

Compound

25. A physical change differs from a chemical change in that ___ are formed

answer In a physical change no new substances are formed.

26. Explain why changes of state are physical changes? Use one complete sentence. Do not use pronouns!

Answer: Changes of state do not change the substance’s identity.

27. Name the two types of pure substances. Use a complete sentence. Do NOT use pronouns.

Answer: Elements and compounds are the two types of pure substances.

28. List four clues that suggest a chemical change is taking place.

Possible clues: smoke, fire, heat, energy, light, color or odor change, fizzing or bubbling Examples: burning, cooking, frying, reacting,

29. Why is light not a form of matter? Use a complete sentence. Do NOT use pronouns.

Answer: Light is not made up of matter. Light is energy.

30. Calculate the density of a sample of gas with a volume of 130 mL and a mass of 585 g. DO ALL OF THESE STEPS! Write out the formula Write in the known values Calculate Round to sig figs! Label your answer

Answer: Density = mass/volume D = 585 g/130 mL 585/130 = 4.5 two sig figs 4.5 g/mL

Essay Explain what it means to say that a chemical change is a change in composition. Give an example of a chemical change and state what changes occur.

Essay How do you know that the air you breathe is matter even though you cannot see it?

Essay #2 answer Air expands to fill our lungs so it must take up space which is one of the criterion for matter. Also could use that it fills up other objects such as balloons.