Physical Science: Chapter 19: Chemical Reactions Part 2

Identify:

Groups:

(a) Molecular Interaction

,

(b) Chemical Reaction

• 
• 
• 
• 
• 
• 
• 
• 

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-2

Is this chemical equation balanced?

4 NH₃ +5 O₂ --> 4 NO + 6 H₂O

• Yes

• No

Tags

NGSS.HS-PS1-7

(BEST ANSWER)

Balancing chemical equations is based on adhering to the fundamental principle of:

• the conservation of mass

• the conservation of momentum

• Inertia

• the electrical force of attraction and repulsion

• the universally attractive force of gravity

Tags

NGSS.HS-PS1-7

Balance this chemical equation:

H₂ + N₂ --> NH₃

• 3 H₂ + N₂ --> 2 NH₃

• H₂ + N₂ --> 2 NH₃

• 3 H₂ + 2 N₂ --> 2 NH₃

• 2 H₂ + 3 N₂ --> 2 NH₃

• 2 H₂ + 2 N₂ --> 3 NH₃

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

1) Displacement reaction

2) Neutralization reaction

3) Combustion reaction

4) Decomposition reaction

5) Combination reaction

• 1: E

  2: D

  3: C

  4: B

  5: A

• 1: D

  2: E

  3: C

  4: B

  5: A

• 1: E

  2: C

  3: D

  4: B

  5: A

• 1: B

  2: D

  3: C

  4: A

  5: E

• 1: C

  2: D

  3: E

  4: A

  5: B

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Match the type of chemical reaction below.

• Pb + FeSO₄ ----> PbSO₄ + Fe

• Single displacement reaction

• Synthesis reaction

• 2KI −> 2K + I₂​  

• Combustion reaction

• CH₄​+O₂​→CO₂​+H_2​O

• Double displacement reaction

• BaCl_2​+2KI −> 2KCl + BaI_2​

• Decomposition reaction

Tags

NGSS.MS-PS1-5

During a chemical reaction, chemical bonds are broken and atoms ​ (a)   themselves to form new chemical bonds.

Breaking and forming chemical bonds involves changes in ​ (b)   .

Consider a pair of strong magnets held together by the magnetic force. To ​ (c)   them requires an input of “muscle energy.”

We see that energy must be put into the system in order to pull the two magnets ​apart, and energy is released from the system as they ​​ (d)   . The same principle applies to atoms.

To pull bonded atoms apart requires energy input. When atoms combine, there is energy output. Released energy is usually in the form of either heat or ​ (e)   .

• rearrange
• energy
• separate
• light
• come together

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

H₂ + O₂ --> H₂O

1) Is this reaction exothermic or endothermic?

2) How much energy is absorbed or released in kJ/mole?

• 1: exothermic

  2: 486 kJ/mole

• 1: exothermic

  2: 436 kJ/mole

• 1: exothermic

  2: 464 kJ/mole

• 1: endothermic

  2: 486 kJ/mole

• 1: endothermic

  2: 436 kJ/mole

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

On the chart, use the lowest value when given a range:

H₂ + N₂ --> H₂NNH₂

1) Is this reaction exothermic or endothermic?

2) How much energy is absorbed or released in kJ/mole?

• 1: exothermic

  2: 386 kJ/mole

• 1: exothermic

  2: 436 kJ/mole

• 1: exothermic

  2: 946 kJ/mole

• 1: endothermic

  2: 144 kJ/mole

• 1: endothermic

  2: 160 kJ/mole

Tags

NGSS.HS-PS1-4

N₂O₄ --> 2 NO₂

1) Are chemical bonds being broken in the reactants?

2) Are chemical bonds being formed in the products?

3) Is this reaction exothermic or endothermic?

• 1: Yes

  2: No

  3: endothermic

• 1: Yes

  2: Yes

  3: endothermic

• 1: No

  2: Yes

  3: endothermic

• 1: No

  2: No

  3: endothermic

• 1: Yes

  2: No

  3: exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-2