Unit 9 Review

Presentation

•

Chemistry

•

11th Grade

•

Practice Problem

•

Medium

•

NGSS

HS-PS1-7, HS-PS1-2

Standards-aligned

KENIA BECERRA

Used 9+ times

FREE Resource

7 Slides • 12 Questions

Unit 9 Review

Feel free to skip any videos ONLY IF you already know how to solve the problems.
If you get stuck, watch the videos before moving on to the next slide to work out the problems.
Look at the Unit 9 Notes tab on Canvas for the powerpoint presentations.

Types of Chemical Reactions

Match

Match the following equations to their type.

2H₂ + O₂ → 2H₂O

2HgO → Hg + O₂

K + ZnCl₂→ KCl + Zn

K₂CO₃ + BaCl₂ → 2KCl + BaCO₃

CH₄ + 2O₂ → CO₂ + H₂O

Synthesis

Decomposition

Single - Replacement

Double - Replacement

Combustion

Must follow the law of conservation of mass: mass cannot be created nor destroyed.
Reactants = Products

Balancing Chemical Equations

Labeling

Work out the problem as shown in the previous video.

Drag the following coefficients so they balance out the equation.

Drag labels to their correct position on the image

Multiple Choice

_BaCl₂ + _Na₂SO₄ → _NaCl + _BaSO₄

balanced

4, 3, 1

2,2,4,3

1, 1, 2, 1

●Shows the relationship between any two substances in balanced chemical equations

●Obtained from the coefficients of a balanced chemical equation.

Mole to Mole Ratio

Multiple Choice

2Al₂O₃ --> 4Al + 3O₂ What is the mole ratio of aluminum, to oxygen (O₂)?

2:4

2:3

4:3

3:2

Multiple Choice

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

Multiple Choice

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

6.7 mol

10.05 mol

1.0 mol

4.5 mol

Fill in the Blanks

For the reaction:

C + 2H₂ --> CH₄,

How many moles of hydrogen are required to produce 10 mols of methane, CH₄?

Only write the number in answer.

Type answer...

Molar mass- mass of one mole
► For an element, molar mass is also the average atomic mass

(found on periodic table)

► For a compound, molar mass is the sum of average atomic mass of each atom present in the compound

EX: H₂O

H- 1g x 2mol = 2g

O- 16g x 1mol =16g

H₂O = 18g/mol

Grams to Mol

Multiple Choice

How do I move from grams to moles?

multiply by molar mass

divide by molar mass

multiply by Avogadro's number

divide by Avogadro's number

Fill in the Blanks

2NaClO₃ (s) → 2NaCl (s) + 3O₂ (g) 12.00 moles of NaClO₃ will produce how many grams of O₂?

(Molar Mass of O₂ is 32g/mol)

Write your number to the nearest whole number. Only write the number.

Multiple Choice

If 25.0 mol of calcium hydroxide (MM 74g/mol) are mixed with excess sodium how many grams of sodium hydroxide (NaOH) (MM 40g/mol)will be produced?

Sodium and calcium hydroxide react according to the equation below:

2Na + 1Ca(OH)₂ -> 2NaOH + 1Ca

2000g

500g

925g

3700g

Percent Yield

Actual yield - the amount of product measured in the laboratory.
Sometimes called “experimental yield”
Theoretical yield - the amount of product predicted (through calculations) to be produced.

Multiple Choice

Use the answer from the previous section:

If 25.0 mol of calcium hydroxide (MM 74g/mol) are mixed with excess sodium how many grams of NaOH could be expected to be produced? (2000g)

Determine the percent yield if 987 grams of NaOH (MM 40g/mol) were experimentally produced?

26.68%

202.63%

49.35%

374.87%

Grams to Grams

Fill in the Blanks

How many grams of sodium metal (MM: 23g/mol) are required to completely react with 12.5 grams of chlorine gas (MM: 71g/mol)?

2 Na + Cl₂ → 2NaCl

Round to 2 decimals

Type answer...

Unit 9 Review

Feel free to skip any videos ONLY IF you already know how to solve the problems.
If you get stuck, watch the videos before moving on to the next slide to work out the problems.
Look at the Unit 9 Notes tab on Canvas for the powerpoint presentations.

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