Chemistry Midterm Review Spring

How many moles of HCl are needed to produce 3.5 moles of H2? Zn + 2 HCl → ZnCl2 + H2

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NGSS.HS-PS1-7

How many moles of aluminum are needed to react completely with 5.2 mol of FeO? 2 Al(s) + 3 FeO(s) → 3 Fe(s) + AlO(s)

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NGSS.HS-PS1-7

Hydrogen gas can be produced by reacting aluminum with sulfuric acid. How many moles of sulfuric acid are needed to completely react with 15.0 grams of aluminum? 2 Al(s) + 3 H2SO4(aq) → Al2(SO4)3(aq) + 3 H2(g)

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NGSS.HS-PS1-7

The equation below shows the decomposition of lead nitrate. How many grams of oxygen are produced when 11.5 g NO2 is formed? 2 Pb(NO3)2 (s) → 2 PbO (s) + 4 NO2 (g) + O2 (g)

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NGSS.HS-PS1-7

What particle does argon-39 (atomic number 18) emit when it decays to potassium-39 (atomic number 19)?

• neutron

• gamma ray

• beta particle

• alpha particle

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NGSS.HS-PS1-8

The less penetrating form of radiation is ____.

• beta radiation

• alpha radiation

• gamma radiation

• X-rays

Why does a higher temperature cause a reaction to go faster?

• There are more collisions due to faster moving particles.

• The particles are moving faster, collisions occur at the same rate.

• The particles are more spread apart, therefore more collisions

• There is a higher surface area, so more collisions

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NGSS.HS-PS1-5

Which change would most likely increase the rate of a chemical reaction?

• Decreasing a reactant's concentration

• Decreasing a reactant's surface area

• Cooling the reaction mixture

• Adding a catalyst to the reaction

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NGSS.HS-PS1-5

What would likely happen if you were to touch the flask in which an endothermic reaction was occurring?

• It feels cooler.

• It feels warmer.

• It feels the same.

• none of the above

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NGSS.HS-PS1-4

A piece of metal is heated, then submerged in cool water. Which statement below describes what happens?

• The temperature of the metal will increase.

• The temperature of the water will increase.

• The temperature of the water will decrease.

• The temperature of the water will increase and the temperature of the metal will decrease.

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NGSS.HS-PS3-4