Q: A hospital uses a laser with a wavelength of 532 nm for skin treatments. What is the frequency of this radiation? Use $$c = 3.00 \times 10^8$ m/s.

$$5.64 \times 10$$^{14}$$\ \text{s}^{-1}$$

Q: A sample contains $$545 g of Zn. $$How many Zn atoms are present? (Zn molar mass = 65.4 g/mol, $$N_A = 6.02 \times 10$$^{23}$$)

$$3.28 \times 10$$^{26}$$ atoms

Q: Which of the following is the correct relationship for the rate of effusion of two gases according to Graham's law?

$$\frac{\text{rate}_2}{\text{rate}_1} = \sqrt{\frac{mm_1$}{mm_2$}}$$

Question 1

A hospital uses a laser with a wavelength of 532 nm for skin treatments. What is the frequency of this radiation? Use $$c = 3.00 	imes 10^8$ m/s.

Accepted Answer

$$5.64 	imes 10$$^{14}$$\ 	ext{s}^{-1}$$

Question 2

A sample contains $$545 g of Zn. $$How many Zn atoms are present? (Zn molar mass = 65.4 g/mol, $$N_A = 6.02 	imes 10$$^{23}$$)

Accepted Answer

$$3.28 	imes 10$$^{26}$$ atoms

Question 3

Which equation correctly relates the energy of a photon to its frequency?

Accepted Answer

$$E = h \cdot f$$

Question 4

A weather balloon contains 2.00 mol of helium at 1.00 atm and 273 K. What is its volume? ($$R = 0.08206 L $$atm K$$^{-1}$$ mol$$^{-1})$$

Accepted Answer

$$44.8 L$$

Question 5

Which of the following is the correct noble gas core for the electron configuration of molybdenum (Mo)?

Accepted Answer

Kr

Question 6

A solution is prepared by dissolving 10.0 g NaCl in enough water to make 500 mL of solution. What is the molarity of the solution? (NaCl molar mass = 58.44 g/mol)

Accepted Answer

$$0.342 M$$

Question 7

Which equation is used to calculate the energy change for a reaction at constant pressure?

Accepted Answer

$$\Delta G^o = \Delta H - T\Delta S$$

Question 8

A 25.00 g sample of carbon contains how many moles of carbon? (C molar mass = 12.01 g/mol)

Accepted Answer

$$2.082$$ mol

Question 9

Which of the following is the correct expression for the Nernst equation for the cell reaction $$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)}$$?

Accepted Answer

$$E_{cell} = E^o_{cell} - \frac{0.0591}{2} \log \left( \frac{[Zn$$^{2+}$$]}{[Cu$$^{2+}$$]} \right)$$

Question 10

A sample of gas occupies 10.0 L at 300 K. If the temperature is increased to 600 K at constant pressure, what is the new volume?

Accepted Answer

$$20.0 L$$

Question 11

Which of the following is the correct formula for calculating the kinetic energy of a moving object?

Accepted Answer

$$KE = \frac{1}{2} m v^2$

Question 12

How many orbitals are there in a subshell designated by the quantum numbers $$n = 3$$, $$l = 2$$?

Accepted Answer

5

Question 13

Which of the following is the correct relationship for the rate of effusion of two gases according to Graham's law?

Accepted Answer

$$\frac{	ext{rate}_2}{	ext{rate}_1} = \sqrt{\frac{mm_1$}{mm_2$}}$$

Question 14

A 1.312 mol sample of He has what mass? (He molar mass = 4.00 g/mol)

Accepted Answer

$$5.25 g$$

Question 15

Which quantum number determines the energy of an orbital in the hydrogen atom?

Accepted Answer

$$n$$

Question 16

A solution is made by dissolving 5.00 g of glucose (C$$_6H$_{12}O$_6) in $$enough water to make 100.0 mL of solution. What is the molarity? (Molar mass = 180.16 g/mol)

Accepted Answer

$$0.278 M$$

Question 17

Which of the following is the correct equation for the relationship between Celsius and Kelvin temperatures?

Accepted Answer

$$^\circ C = K - 273$$

Question 18

Which of the following is the correct value for Avogadro's number?

Accepted Answer

$$6.02 	imes 10$$^{23}$$

Question 19

A 37Cl atom has how many protons, neutrons, and electrons?

Accepted Answer

17 protons, 20 neutrons, 17 electrons

General Chemistry Practice Test 1 – Step-by-Step Study Guidance

Guida di studio - Domande di pratica

Study guide - Flashcard