Question 1

A patient’s body temperature is measured as 102°F. What is this temperature in Kelvin ($K$)? Use the conversion formulas: $T(°F) = 1.8 	imes T(°C) + 32$ and $T(K) = T(°C) + 273.15$.

Accepted Answer

$311.9\ K$

Question 2

Which of the following statements about significant figures is correct?

Accepted Answer

All zeros to the right of a decimal point and at the end of a number are significant.

Question 3

A chemist needs to prepare $250\ mL$ of a solution. Express this volume in liters using SI prefixes.

Accepted Answer

$0.25\ L$

Question 4

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

Accepted Answer

$E = h 
u$

Question 5

A laser emits light with a wavelength of $500\ nm$. What is the frequency of this light? ($c = 3.00 	imes 10^8\ m/s$)

Accepted Answer

$5.00 	imes 10^{14}\ Hz$

Question 6

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($l$)

Question 7

A sample contains $3.01 	imes 10^{23}$ molecules of water. How many moles of water are present? ($N_A = 6.022 	imes 10^{23}\ mol^{-1}$)

Accepted Answer

$0.50\ mol$

Question 8

Which of the following best describes the difference between precision and accuracy?

Accepted Answer

Precision refers to how close measurements are to each other; accuracy refers to how close measurements are to the true value.

Question 9

Which of the following is the correct SI prefix for $10^{-6}$?

Accepted Answer

micro

Question 10

A car travels at a speed of $90\ km/h$. Convert this speed to $m/s$ using dimensional analysis.

Accepted Answer

$25.0\ m/s$

Question 11

Which statement about the electromagnetic spectrum is correct?

Accepted Answer

Gamma rays have the highest frequency and energy.

Question 12

Which of the following is NOT a state of matter?

Accepted Answer

Solution

Question 13

Calculate the kinetic energy of a $0.150\ kg$ baseball moving at $40.0\ m/s$. Use $KE = \frac{1}{2}mv^2$.

Accepted Answer

$240\ J$

Question 14

Which quantum number specifies the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number ($m_l$)

Question 15

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 16

What is the energy of a photon with a wavelength of $400\ nm$? ($h = 6.626 	imes 10^{-34}\ J\cdot s$, $c = 3.00 	imes 10^8\ m/s$)

Accepted Answer

$4.97 	imes 10^{-19}\ J$

Question 17

Which of the following combinations of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$n = 2,\ l = 2,\ m_l = 0,\ m_s = +\frac{1}{2}$

Question 18

Which of the following best describes the phase of an atomic orbital?

Accepted Answer

The phase describes the sign of the wave function in different regions of space.

Question 19

Which of the following is the correct formula for density?

Accepted Answer

$D = \frac{m}{V}$

Question 20

A student measures the mass of a sample as $12.5\ g$ and its volume as $5.0\ mL$. What is the density of the sample?

Accepted Answer

$2.5\ g/mL$

General Chemistry Exam 1 Study Guide: Essentials, Atoms, and Quantum-Mechanical Model

Study Guide - Practice Questions

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