Question

1. cL, Km and cm3 are metric units that measure the following..? 2. A small flask...

1. cL, Km and cm3 are metric units that measure the following..?

2. A small flask weighs 135.75 grams. When is filled completely with ethyl alchol, it weighs 178.07g. When the flask is filled completely with liquid carbon disulfide, it weighs 203.49g the density of carbon sulfide is 1.263g/ml. what is denisity of the ethyl alcohol?

3. A mixture is...?

4. How many protons are in the nucleus of the silicon atom?

5. How many moles of sulfide atoms are there in 1 mole of Fe2(SO4)3?

6. What is the formula of Calcium Ion?

7. What is the formula for magnesium nitrate?

8. What is the molecular weight of Ca3(PO4)2 to the nearest whole number?

9.   How many moles of NO2 are contained in 45.1g of NO2?

10. How many grams of Al are reuired to react completely with 4.30g of HCi according to the following equation?    2Al +6HCl -> 2AlCl3 + 3H2

11. Concentrated sodium hydoxide solution contains 50.0% by mass NaOH an has density of 1.52g/mL. What volume of this solution in mL. required to abotain 1.35g of N6OH?

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Homework Answers

Answer #1

1)

cL = centiliter; volume

Km = kilometer, lenght

cm3 = cubic centimeter, volume

2.

ethyl alcohol is a liquid, then it has a constant density, it must be 0.789 g/ml

3)

a mixuture is a set of at least two or more pure substance together

4)

Silicon has the atomic number Z= 14

which means that protons = Z = 14 protons

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