Chem 1180 Exam 1 Prep

What is the wavelength of a photon that has an energy of 9.12 × 10-17 J? (c = 3.00 × 108 m/s, h = 6.63 × 10-34 J ⋅ s 2.74 × 101 nm 1.38 × 1017 nm 2.18 nm 9.12 × 10-8 nm 1.00 × 10-32 nm

2.18 nm

What is the frequency of light emitted when the electron in a hydrogen atom undergoes a transition from level n = 7 to level n = 3? (c = 3.00 × 108 m/s, h = 6.63 × 10-34 J ⋅ s), RH = 2.179 × 10-18 J) 2.98 × 1014 Hz 1.98 × 10-19 Hz 1.52 × 1027 Hz 9.94 × 105 Hz 1.01 × 10-6 Hz

2.98 × 1014 Hz

The distance between atoms is sometimes given in picometers, where 1 pm is equivalent to 1 10-12 m. If the distance between the layers of atoms in a particular compound is given as 326 pm, what is the distance in cm? 3.26 10-6 cm 3.26 10-8 cm 3.26 10-10 cm 3.26 10-12 cm 3.26 10-14 cm

3.26 10-8 cm

How many neutrons are there in the nickel-58 nuclide? 86 58 28 30 2

30

How many significant figures are there in the value 0.008350 cm? 7 6 5 3

4

The answer that should be reported for the total mass of solution when 12.16 mg of benzene is added to 4.51 g of toluene is 4.52216 g. 4.5222 g. 4.522 g. 4.52 g. 4.5 g

4.52 g.

A piece of metal (mass = 17.576 g) is placed in 12.30 mL of chloroform (d = 1.498 g/mL) in a 25-mL graduated cylinder. The chloroform level increases to 15.46 mL. The best value for density of this metal from these data is 5.562 g/mL. 1.14 g/mL. 5.56 g/mL. 8.33 g/mL. 3.71 g/mL.

5.56 g/mL.

How many electrons does a barium ion have? 2 8 54 56 38

54

The best answer to report for 987.07 - 87.4649 is 899.6051. 899.605. 899.61. 899.6. 900.

899.61.

What is the formula for the binary compound formed between Al3+ and Se2- ions? AlSe Al2Se Al2Se3 Al3Se2 AlSe3

Al2Se3

All of the following statements about different elements are true except Potassium is an alkali metal. Aluminum is a transition element. Barium is an alkaline earth metal. Fluorine is a halogen.

Aluminum is a transition element.

A sample of TNT, C7H5N3O6 , has 7.14 × 1021 nitrogen atoms. How many hydrogen atoms are there in this sample of TNT? 7.14 × 1021 9.52 × 1021 1.19 × 1022 1.43 × 1022 1.67 × 1022

1.19 × 1022

A particular liquid boils at -246°F. What is its boiling point on the Kelvin scale? 119 K 168 K 154 K 136 K 236 K

119 K

If two different nuclides have the same mass number, it must mean that both have the same total number of protons. both have the same total number of neutrons. Correct! both have the same total number of protons and neutrons. both have the same total number of electrons. they are isotopes.

both have the same total number of protons and neutrons.

Which type of electromagnetic radiation has the shortest wavelength? microwaves x rays blue light red light

gamma rays

Which of the following is an example of a chemical change? water boiling ice melting alcohol evaporating iodine vaporizing gasoline burning

gasoline burning

All of the following elements are best classified as metalloids except B. Si. Ga. As. Te.

Ga.

Which name-formula pair is incorrect? H2SO3, sulfurous acid HClO2, chlorous acid H2CO3, carbonic acid HBr, hydrobromic acid H3P, phosphoric acid

H3P, phosphoric acid

The formula for chloric acid is HClO4. HClO3. HClO. HClO2. HCl.

HClO3.

When a hydrogen electron makes a transition from n = 3 to n = 1, which of the following statements is(are) true? I.Energy is emitted. II.Energy is absorbed. III.The electron loses energy. IV.The electron gains energy. V.The electron cannot make this transition. I, IV I, III II, III II, IV V

I, III

What is the wavelength of a 149-g baseball traveling at 97.9 mph? (1 mi = 1.609 km, ) 9.83 × 1033 m 2.82 × 10-38 m 1.02 × 10-37 m 3.54 × 1037 m 1.02 × 10-34 m

1.02 × 10-34 m

How many liters are in 41.4 fluid ounces of a soft drink? (1 fl oz = 28.35 mL) 1.46 × 103 L 1.17 L 1.17 × 106 L 1.46 × 10-3 L 1.17 × 103 L

1.17 L

Which of the following statements is incorrect? The product of wavelength and frequency of electromagnetic radiation is a constant. As the energy of a photon increases, its frequency decreases. As the wavelength of a photon increases, its frequency decreases. As the frequency of a photon increases, its wavelength decreases. As the wavelength of a photon increases, its energy decreases.

As the energy of a photon increases, its frequency decreases.

2.54 minutes contain this many nanoseconds. A.1.52 × 10^12 B. 1.52 × 10^11 C. 4.23 × 10^7 D. 4.23 × 10^8 E. 1.52 × 10^14

B. 1.52 × 10^11

In a certain chemical reaction, 9.11 g of compound A is added to 9.93 g of compound B. Once the reaction is complete, 1.67 g of compound A and 4.64 g of compound B remain. What mass of products was produced? A. 7.44 g B. 6.31 g C. 25.35 g D. 12.73 g E. 5.29 g

D. 12.73 g

All of the following statements are correct except A. The conversion of compounds into elements is a chemical change. B. The conversion of sugar into carbon and water is a chemical change. C. The conversion of elements into compounds is a chemical change. D. The conversion of liquid water into gaseous water is a chemical change. E. The evaporation of water is a physical change.

D. The conversion of liquid water into gaseous water is a chemical change.

Which of the following is an ionic compound? CH3OH HOClO NH4CN NH3 N2O3

NH4CN

Which of the following is a correct conclusion that may be drawn from the results of Rutherford's gold foil experiments? All positively charged alpha particles pass directly through gold foil. Alpha particles are positively charged helium nuclei. Alpha particles collide with the electrons of gold atoms, causing the atoms to become cations. Some alpha particles are scattered by the nuclei of gold atoms. There is negligible interaction between alpha particles and gold atoms.

Some alpha particles are scattered by the nuclei of gold atoms.

The contribution for which de Broglie is best remembered in modern science is his statement that an electron can exist in an atom only in discrete energy levels. his statement that no electron can have identical values for all four quantum numbers. his proposal that particles of matter should be associated with wavelike behavior. his statement that elements show periodic repetition of properties.

his proposal that particles of matter should be associated with wavelike behavior.

A solution is a Pure compound. homogeneous mixture. heterogeneous mixture. pure element. pure mixture.

homogeneous mixture.

Which name-formula pair is incorrect? magnesium sulfate heptahydrate, MgSO4·7H2O strontium nitride, Sr3N2 titanium(IV) carbide, TiC dinitrogen tetroxide, N2O4 hypochlorous acid, HClO2

hypochlorous acid, HClO2

The names of the elements whose symbols are Si, P, Mn, and S are, respectively, silicon, potassium, manganese, and sulfur. silver, phosphorus, magnesium, and sodium. silicon, potassium, magnesium, and sulfur. silver, potassium, manganese, and sodium. silicon, phosphorus, manganese, and sulfur.

silicon, phosphorus, manganese, and sulfur.