Chem Review!

^{What does the X stand for?}

• Mass Number

• Atomic Number

• Element Symbol

• Charge of the Isotope

Take the reaction: 2NH₃ + 2.5O₂  2NO + 3H₂O.

In an experiment, 3.24 g of NH₃ are allowed to react with 3.50 g of O₂. 

Which reactant is the limiting reagent?

Take the reaction: 2NH₃ + 2.5O₂ --> 2NO + 3H₂O.

In an experiment, 3.24 g of NH₃ are allowed to react with 3.50 g of O₂. 

How many grams of NO are formed?

• 2.625 g

• 2.6 g

• 2.6 g

• 2.62 g

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction

Should we subtract the mass of electrons when trying to find the nuclear binding energy?

• No

• Yes

• Uh......

• I can't read.

What's the difference between a beta-minus decay and Beta-plus decay?

• Beta-minus emits a positron, Beta-plus emits an electron

• There is no difference

• Beta-plus emits an electron, Beta-minus emits a positron

• Beta-minus emits an electron, Beta-plus emits a positron

(Undergoes Beta Decay, not Positron)

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What's the [NaCl] if you added a gram of NaCl to 1L H2O and diluted to 200mL?

How many moles would you have in 5mL? (Closest to your answer)

• 0.0856M

• 0.0913M

• 4.28 x 10^-4 mol

• 4.17 x 10^-4 mol

What's the wavelength of light (in m) that has a frequency of 500Hz?

(1 Sig Fig)

2. Calculate the wavelength (in nm) of light emitted from a hydrogen atom when there is a transition from n=2 → n=1.