Phy Sci Chem Eqns and Balancing

Phy Sci Final Exam Review Chem Equations & Balancing

​DIATOMIC ELEMENTS

Multiple Select

Which of the following elements are considered diatomic? Check all.

• Phosphorous

• Nitrogen

• Iodine

• Carbon

Drag and Drop

Which is the correct chemical equation for the following: Solid Zn reacts with silver (I) chloride to produce Zinc (II) chloride and silver metal

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Zn

AgCl

ZnCl2

Ag

Zn2

Ag2Cl

Zn2Cl

Drag and Drop

Translate the word equation below:

Nitrogen reacts with Hydrogen to form Ammonia (NH₃).

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N2

H2

NH3

N

H

Drag and Drop

Magnesium can be burned in oxygen to produce solid magnesium oxide.

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Mg

O2

MgO

Mg2

O

Mg2O2

Mg02

Drag and Drop

Sodium reacts with chlorine gas to produce sodium chloride.

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Na

Cl2

NaCl

Na2

Cl

Na2Cl

Na2Cl2

NaCl2

Multiple Choice

Translate the word equation below.

Hydrogen and Carbon Dioxide react to form Carbonic Acid (H₂CO₃).

• $$H\ +\ CO_2\ \rightarrow\ H_2CO_3$$

• $$H\ \rightarrow\ CO_2\ +\ H_2CO_{3_{ }}$$

• $$H_2\ +\ CO_2\ \rightarrow\ H_2CO_3$$

• $$H_2\ \rightarrow\ CO_2\ +\ H_2CO_3$$

Multiple Choice

Translate the word equation below.

Carbon Dioxide and Hydrogen react to form Methane (CH₄) and Water

• $$CO_{2_{\ }}+\ H_2O\ \rightarrow\ CH_4\ +H_2\$$

• $$CO_2\ \rightarrow\ H_2\ +\ CH_4\ +\ H_2O$$

• $$CO_2\ \ +\ H_2\ +\ CH_4\ \ \rightarrow\ H_2O$$

• $$CO_2\ \ +\ H_2\ \rightarrow\ CH_4\ +\ H_2O$$

Multiple Choice

Translate the word equation below.

Sulfur Trioxide reacts with Water to form Sulfuric Acid (H₂SO₄).

• $$SO_3\ +\ H_2O\ \rightarrow\ H_2SO_4$$

• $$SO_3\ \rightarrow\ H_2O\ +\ H_2SO_4$$

• $$SO_2\ +\ H_2O\ \rightarrow\ H_2SO_4$$

• $$SO\ \rightarrow\ H_2O\ +\ H_2SO_4$$

Multiple Choice

Translate the word equation below.

Carbon Dioxide and Water react to form Glucose (C₆H₁₂O₆) and Oxygen.

• $$CO_2\ +\ H_2O\ \rightarrow\ C_6H_{12}O_6\ +\ O_2$$

• $$CO_2\ +\ H_2O\ +\ C_6H_{12}O_6\ \rightarrow\ O_2$$

• $$CO_2\ +\ H_2O\ \rightarrow\ C_6H_{12}O_6\ +\ O_{ }$$

• $$CO_2\ \rightarrow\ H_2O\ +\ C_6H_{12}O_6\ +\ O_2$$

Multiple Choice

Sodium reacts with chlorine gas to produce sodium chloride.

• NaCl→ Cl + Na

• Na+ CO₂ → NaCO₂

• Na + Cl₂→ NaCl

• Na + Cl → NaCl

Fill in the Blanks

The law of

of mass says that matter cannot be created nor destroyed.

REMEMBER

# of each element in reactants

MUST EQUAL

# of each element in products

2Al₂(CO₃)₃

• Al: 4 because 2 x 2 = 4

• C: 6 because 2 x 3 = 6

• O: 18 because 3 x 3 x 2 = 18

___ H₂ + ___ O₂ → ___H₂O

Balance this equation.

Multiple Choice

The substances that go into a reaction are called the _______.

• products

• reactants

2H₂ + O₂ ---> 2H₂O

This equation is BALANCED on both sides.

Notice that there are 4 Hydrogens and 2 Oxygens on each side.

The full-size numbers to the LEFT of the elements/compounds are called COEFFICIENTS and are the ONLY VALUES YOU CAN CHANGE.

The small numbers to the right of the elements are called SUBSCRIPTS and MUST STAY THE SAME in the equation.

Multiple Choice

What is the little number after an element in a chemical equation called?

Example: H₂

• Coefficient

• Atom

• Subscript

• Equation

Multiple Choice

Is the following equation balanced?

Al + O₂ ---> 2Al₂O₃

• YES

• NO

Multiple Choice

What coefficients are needed to balance the equation?

___Al + ___ O₂ ---> 2Al₂O₃

• 3,2

• 3,4

• 4 , 3

• 4,2

Multiple Choice

Balance this equation

_Al +_HCl --> _H₂ +_AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Multiple Choice

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1

• 2

• 3

• 4

Multiple Choice

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1

• 2

• 3

• 4

Multiple Choice

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants

• Products 

• Yields 

• Chemical Equation 

Multiple Choice

Balance this equation.

_SnO₂ +_H₂-->_Sn +_H₂O

• 1,1,2,1

• 1,2,1,1

• 1,2,1,2

• 1,2,2,1

Multiple Choice

Balance this equation.

_CH₄ + _O₂ --> _CO₂ + _H₂O

• 1,2,1,1

• 2,1,2,1

• 1,2,1,2

• 0,2,0,2

Multiple Choice

2NaN₃ --> 2Na + ___N₂

• 1

• 2

• 3

• 4

Multiple Choice

2KClO₃ --> ___KCl + 3O₂

• 1

• 2

• 3

• 4