Q: What is the equivalent value of $$513\ \mathrm{mK/s} in$$ $$\mathrm{K/s}$$?

$$5.13 \times 10$$^{-1}$$\ \mathrm{K/s}$$

Question 1

Two unknown liquids, A and B, are reacted to form a solid C and liquid D. The products resemble those of an acid-base reaction. Can we determine whether A, B, C, and D are elements or compounds based on these observations?

Accepted Answer

No, we cannot tell

Question 2

Is melting an ice cube a physical or chemical process?

Accepted Answer

Physical process

Question 3

Select the chemical property of uranium from the following:

Accepted Answer

Reacts with cold water

Question 4

An unknown element has the following properties:
1. Appears as a silvery liquid
2. Density of $$13.53\ \mathrm{g/cm^3$} at $$room temperature
3. Reacts with molecular iodine to produce a red solid
4. Freezes at $$-38.83\ ^\circ\mathrm{C}$$ and boils at $$356.73\ ^\circ\mathrm{C}
5. $$Forms a yellow solid when combined with dilute nitric acid.
Classify each property as physical or chemical.

Accepted Answer

Physical properties: 1, 2, 4; Chemical properties: 3, 5

Question 5

Which of the following is an extensive property?

Accepted Answer

Volume

Question 6

The summit of a mountain has an average temperature of $$13^\circ\mathrm{F}. $$Express this temperature in Kelvin.

Accepted Answer

$$263\ \mathrm{K}$$

Question 7

True or False: To express a number in scientific notation, increasing the coefficient value means the exponent is negative while decreasing the coefficient value means the exponent is positive.

Accepted Answer

False

Question 8

In classical mechanics, kinetic energy is defined as $$\frac{1}{2}mv^2$. Derive a unit for energy starting with SI base units. Using SI prefixes, suggest a convenient unit for the kinetic energy of a car weighing 2500 pounds moving at 45 mi/hr and the kinetic energy of an electron moving at 35% of the speed of light (m$$_{	ext{electron}} = 9.11 	imes $$10^{-31}$$\ \mathrm{kg}$$, c = 3.00$$ 	imes $$10^8$$\ \mathrm{m/s}$$).

Accepted Answer

J; kJ, fJ

Question 9

What is the equivalent value of $$513\ \mathrm{mK/s} in$$ $$\mathrm{K/s}$$?

Accepted Answer

$$5.13 	imes 10$$^{-1}$$\ \mathrm{K/s}$$

Question 10

Determine the number of significant figures in the following scientific notation: $$2.71 	imes 10^5$.

Accepted Answer

3

Question 11

A vehicle's speedometer shows 115 mph and 185 km/h. How many significant figures should each reading have?

Accepted Answer

115.0 mph with 4 significant figures and 185.0 km/h with 4 significant figures

Question 12

Perform the following operation and express the answer using the correct number of significant figures: $$780 + 6.97 - 81.197.$$

Accepted Answer

$$706$$

Question 13

Is a fluid ounce larger than a pint? By how much?

Accepted Answer

No, a pint is about 16 times larger than a fluid ounce.

Question 14

The nitrogen level in an urban apartment is $$521\ \mu\mathrm{g/m^3$}. $$Calculate the mass of nitrogen gas in grams if the apartment is $$10.2\ \mathrm{ft} 	imes 9.8\ \mathrm{ft} 	imes 21.5\ \mathrm{ft}.$$

Accepted Answer

$$2.1\ \mathrm{g}$$

Question 15

A student measures 15 mL of a liquid and finds it weighs 26.2 g. The density of cyclohexane is $$0.773\ \mathrm{g/mL} at $$room temperature. Is it possible that the liquid is cyclohexane?

Accepted Answer

Yes

Question 16

The diameter of a spherical ball of copper is $$3.95\ \mathrm{cm}. If $$the density of copper is $$8.96\ \mathrm{g/cm^3$}$$, determine the mass of the sphere. Use $$V = \frac{4}{3}\pi r^3$.

Accepted Answer

$$376\ \mathrm{g}$$

Question 17

An aluminum bicycle frame weighing $$3.69\ \mathrm{kg}$$ was placed in a pool filled with water. The displaced water was measured to be $$1.365\ \mathrm{L}. $$Calculate the density of the metal.

Accepted Answer

$$2.70\ \mathrm{g/cm^3$}$$

Question 18

Identify the element that 'X' represents in $$^{72}_{32}X.$$

Accepted Answer

Germanium

Question 19

Determine the heavier atom between $$^{14}\mathrm{C}$$ and $$^{14}\mathrm{N} by $$comparing the total masses of their subatomic particles.

Accepted Answer

$$^{14}\mathrm{C} is $$heavier than $$^{14}\mathrm{N}$$

Question 20

If six electrons were removed from tungsten, $$^{184}\mathrm{W}$$, write the symbol of the ion formed.

Accepted Answer

$$^{184}\mathrm{W}^{6+}$$

Question 21

There are two stable isotopes of chlorine, $$^{35}\mathrm{Cl}$$ and $$^{37}\mathrm{Cl}$$. $$^{35}\mathrm{Cl}$$ has a mass of $$34.9689$$ amu and a natural abundance of $$75.77\%. $$Calculate the m/m % of $$^{37}\mathrm{Cl} in $$grams contained in 100 grams of chlorine element.

Accepted Answer

50.69 %

Question 22

Classify the following as metal or nonmetal:
Na, Br, N, Ca

Accepted Answer

Na = metal; Br = nonmetal; N = nonmetal; Ca = metal

Question 23

Identify the group name for each element:
Ba, Cl, Ne, Na, At

Accepted Answer

Ba = alkaline earth metal; Cl = halogen; Ne = noble gas; Na = alkali metal; At = halogen

Question 24

Determine if vanadium is a main-group element or not.

Accepted Answer

Vanadium is in group 5B so it's not a main-group element.

General Chemistry Fundamentals: Properties, Measurements, and Classification

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