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chemistry HW/CW

Authored by Michael Ngoh

Chemistry

10th Grade

chemistry HW/CW
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10 questions

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1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Using the balanced equation in question 1,
Mg(s)   +   HCl(aq)  -->   MgCl₂(aq)   +   H₂(g)
How many grams of HCl are consumed by the reaction of 2.50 moles of magnesium?

5.00 g
7.29
182 g
218 g

2.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Using the balanced equation in question 1,
Mg(s)   +   HCl(aq)  -->   MgCl₂(aq)   +   H₂(g)
What is the mass in grams of H₂ gas when 4.0 moles of HCl is added to the reaction?

0.99 g
4.0 g
2.0 g
6.0 g

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of Mg to moles Fe?

3mol Mg / 2 mol Fe
2 mol Mg/ 3 mol Fe
1 mol Fe/ 2 mol Fe
3 mol MgO / 2 mol Fe

4.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Cl2 + 2KBr → Br2 + 2KCl
How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?

749 g
223 g
479 g
814 g

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Fe2O3 + 3H2 → 2Fe + 3H2O
About how many grams of H2O will be produced from 150 grams of Fe2O3

50 grams H2O
60 grams H2O
5000 grams H2O
6000 grams H2O

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

N2 +  3H2 −->  2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

6
2
3
1

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?

6.7 mol
1.0 mol
10.1 mol
4.5 mol

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