Question 1

Which of the following statements about significant figures is FALSE?

Accepted Answer

Leading zeros are significant.

Question 2

Calculate the answer to the following, reporting the correct number of significant figures: $$(97.300 	imes 0.0270514) + (44.0096 \div 41.47389) = 1.00000$$

Accepted Answer

2.693

Question 3

How many significant figures are in the measurement $$0.004460 g$$?

Accepted Answer

5

Question 4

The density of a certain liquid is $$438 kg/m$^3. $$What is this density in units of g/cm$$^3$$?

Accepted Answer

$$0.438 g/cm$^3$$

Question 5

Sally's car gets $$30$$ miles per gallon. Her friend's house is $$480$$ kilometers away. How many liters of gas will Sally need to get there? (1 mile = $$1.609 km$$, 1 gallon = $$3.785 L)$$

Accepted Answer

$$25.6 L$$

Question 6

What is the full atomic symbol for an element with $$17$$ protons, $$20$$ neutrons, and $$18$$ electrons?

Accepted Answer

$$^{37}\mathrm{Cl}^{-}$$

Question 7

How many neutrons are in an atom of $$\mathrm{Pb}$$-$$206$$?

Accepted Answer

124

Question 8

Neon has three naturally occurring isotopes: $$^{20}\mathrm{Ne} (90.5$$%, 19.992 amu), $$^{21}\mathrm{Ne} (0.27$$%, 20.993 amu), and $$^{22}\mathrm{Ne} (9.23$$%, 21.991 amu). What is the atomic mass of Neon?

Accepted Answer

$$20.18$$\ amu

Question 9

Which particles make up the nucleus of an atom? (Select all that apply)

Accepted Answer

Protons and Neutrons

Question 10

What makes up most of the mass of the atom? What makes up most of the volume?

Accepted Answer

Nucleus makes up most of the mass; electron cloud makes up most of the volume.

Question 11

The National Public Radio Station, KOPB, in Portland OR (91.5 FM) has a frequency of $$91.5$$ MHz. What is the wavelength, in nanometers, of the KOPB radio waves? $$(1\mathrm{MHz}=10^6$\mathrm{Hz})$$

Accepted Answer

$$3.28 	imes 10^9$ nm

Question 12

Which type of light has the most energy?

Accepted Answer

Blue

Question 13

Scientists observe the photoelectric effect on a new element. They shine light at 350 nm, then decrease to 250 nm, and finally to 150 nm. Electrons are emitted only at 250 nm and below. What is the threshold frequency for this metal?

Accepted Answer

$$1.2 	imes 10$$^{15}$$ Hz

Question 14

The de Broglie wavelength for an electron in a very powerful electron microscope is $$0.82$$ \AA $$= 0.82 	imes 10$$^{-10}$$ m. At what velocity does this electron travel? (Mass of electron = 9.11$$ 	imes $$10^{-31} kg)$$

Accepted Answer

$$8.8 	imes 10^6$ m/s

Question 15

Which of the following transitions will emit light of the shortest wavelength?

Accepted Answer

n = 4 $$\rightarrow n = 1$$

Question 16

Which of these relationships is true?

Accepted Answer

Energy and Wavelength are inversely proportional.

Question 17

What are the possible $$l$$ values if $$m_l = -2$$?

Accepted Answer

2

Question 18

How many valence electrons does Boron have?

Accepted Answer

3

Question 19

True or False: Hund's rule states that electrons should fill lower energy orbitals singly first, with opposite spins.

Accepted Answer

False

General Chemistry Study Guide: Significant Figures, Dimensional Analysis, Atomic Structure, Properties of Light, Quantum Numbers, and Electron Configurations

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