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Chemistry Quiz 7 (20 MCQs)

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1. Acetylene is burned in welding torches according to the following chemical reaction:2 C2H2 + 5 O2 $\rightarrow$ 4 C02 + 2 H2OHow many oxygen (O) molecules are involved in the reaction?
2. Calculate the molecular mass of $ H_2O$ . ( Atomic mass of $ H=1$, $ O=16$ )
3. A ..... is like a recipe for a chemical substance.
4. A combination of two or more substances in which the substances retain their distinct identities.
5. What is the definition of a compound?
6. Cm3 of nitric acid completely neutralises 50 cm3 of 0.25 mol dm-3 calcium hydroxide. Calculate the molarity of the nitric acid.
7. The process of separating substances in a mixture by evaporating a liquid and condensing a vapor
8. All sides are equal, only two angles are equal (~90$^ \circ$)
9. Determine whether each material below is a pure substance-element, pure substance-compound, a homogeneous mixture, or a heterogeneous mixture.C 2H 2
10. A mixture that contains small, undissolved particles that do not fully dissolve is called a
11. The ability to transfer heat and electricity refers to .....
12. A solution has a pHof 3. What type of solution is this?
13. How many bonds does Carbon need to become stable?
14. Which of the following IS a mixture?
15. The amount of space an object takes up or the amount of space something contains
16. A chemical equation should be balanced to:
17. If two covalently bonded atoms are identical, the bond is
18. What is the correct name of the compound CaCl2?
19. If an element is dull, brittle, and a good insulator, you would be looking for a .....
20. Which physical property is the amount of space something takes up and can be measured with a graduated cylinder?
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