Chemistry Released NCFE

What is the chemical formula for Magnesium bromate?

• MgBr
• MgBr₂
• MgBrO₃
• Mg(BrO₃)₂

How are compounds with metallic bonds similar to ionic compounds?

• Both tend to have double and triple bonds
• Both tend  to have low melting points
• Both tend to have poor conductivity
• Both tend to have high melting points

Which element has the greatest atomic radius?

• H
• Na
• Cl
• Cs

How does the amount of heat energy change as a 250-g sample of water is heated from 5.0°C to 30.0°C? 

• The amount of heat energy increases, causing the water to sublime. 
• The amount of heat energy increases, causing the water to evaporate. 
• As the temperature increases, the amount of heat energy decreases. 
• As the temperature increases, the amount of heat energy increases. 

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

This graph represents data collected when a sample of a gas is uniformly cooled from 155°C.  Why does the temperature of the sample remain constant between point X and point Y? 

• because the sample is transitioning from a gaseous state to a solid state 
• because the sample is transitioning from a gaseous state to a liquid state 
• because the sample is transitioning from a solid state to a gaseous state 
• because the sample is transitioning from a liquid state to a solid state 

Tags

NGSS.HS-PS3-4

The phases of a substance under various pressure and temperature combinations are shown on this phase diagram.  What occurs if the pressure of the substance at point F remains constant, and the temperature increases to point G? 

• It will transition from a solid state to a liquid state. 
• It will transition from a liquid state to a solid state. 
• It will transition from a solid state to a gaseous state. 
• It will transition from a gaseous state to a solid state. 

Tags

NGSS.HS-PS3-1

The potential energy diagram of a chemical reaction is shown below. Which best describes the energy in the chemical reaction? 

• Heat energy was released. 
• Energy was lowered by a catalyst. 
• 8 J of energy were required to start the reaction. 
• 10 J of energy were required to start the reaction. 

Tags

NGSS.HS-PS1-4

This balanced chemical equation represents a chemical reaction:
6NO + 4NH₃  5N₂ + 6H₂O
What volume of NH3 gas,  (at STP), is required to react with 15.0 g of NO? 

• 5.68 L 
• 7.47 L 
• 10.0 L 
• 11.2 L 

Tags

NGSS.HS-PS1-7

This equation represents a chemical reaction at equilibrium.
HCl (aq) + Mg (s) <--> MgCl₂ (aq) + H₂ (g) + heat What happens to the system when the temperature is decreased? 

• The reaction shifts toward the right, and the amount of hydrogen gas increases. 
• The reaction shifts toward the right, and the amount of hydrogen gas decreases. 
• The reaction shifts toward the left, and the amount of hydrogen gas increases. 
• The reaction shifts toward the left, and the amount of hydrogen gas decreases. 

Tags

NGSS.HS-PS1-4

This equation represents a chemical reaction at equilibrium: 2SO₂ (g) + O₂ (g) <--> 2SO₃ (g) What will happen when the concentration of SO₃ is increased? 

• The reaction shifts to the right, and concentrations of SO₂ (g) and O₂ (g) decrease
• The reaction shifts to the right, and concentrations of SO₂ (g) and O₂ (g) increase. 
• The reaction shifts to the left, and concentrations of SO₂ (g) and O₂ (g) decrease. 
• The reaction shifts to the left, and concentrations of SO₂ (g) and O₂ (g) increase. 

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6