Exam 2

A dose of aspirin of 5.0 mg per kilogram of body weight has been prescribed to reduce the fever of an infant weighing 8.5 pounds. The number of milligrams of aspirin that should be administered is: a) 5.0 mg. b) 0.59 mg. c) 19 mg. d) 53 mg. e) 1.6 mg.

c) 19 mg.

What coefficient is placed in front of O2 to complete the balancing of the following equation? C 5H 8 ( l)+ ? O 2( g) → 5CO 2( g) + 4H 2O( g) a) 1 b) 9 c) 7 d) 3

c) 7

The strongest interactions between molecules of hydrogen, H2, are a) dipole-dipole attractions b) Ionic bonds c) Dispersion forces d) Polar covalent e) hydrogen bonds

c) Dispersion forces

The name of the PbO2 is a) lead (II) oxide b) plumbum oxide c) lead (IV) oxide d) lead oxide

c) Lead(IV) oxide

Which of the following is an oxidation-reduction reaction? a) KOH+HNO3-> H2O+KNO3 b) AL2(SO4)3+6KOH->2Al(OH)3+3K2SO4 c) N2+02-> 2NO d) AgNO3 + NaCl-> AgCl + NaNO3 e) CaCl2 + Na2SO4 -> CaSO4 + 2NACL

c) N2+02-> 2NO

The carbon tetrachloride molecule, CCl4, has a _______ shape a) Square b) Spherical c) Tetrahedral d) Cubic e) Circular

c) Tetrahedral

Any chemical reaction or spontaneous event that is observed to occur does so because: a) it leads to a rise in the overall system energy. b) it leads to a reduction of the overall system energy. c) of the interactions with inert gases. d) it is one of life's many mysteries.

c) it leads to a reduction of the overall system energy.

What is the formula of a compound that contains Na^+ and PO4^3- ions? a)Na2Po3 b)NaPO4 c)Na3PO4 d)Na3P

c)Na3PO4

What is the molar mass of copper (II) sulfate, CuSO4?

159.6 g

The mole of neon has a mass of

20.2 g

How many valence electrons are in the electron-dot structures for the elements in group 3A(13)?

3

What is the ionic charge of an ion with 13 protons and 10 electrons?

3+

Written in scientific notation, 0.000 000 33 is

3.3 x 10^-7

What is the molar mass of helium?

4.00 g

How many moles of water, H2O, are present in 75g of H2O

4.16 moles

One mole of particles of any substance contains how many particles? a) 106 b) 3 × 10^-10 c) 6.02 × 10^23 d) 3 × 1010

6.02 × 10^23

A liquid has a volume of 34.6 mL and a mass of 46g. What is the density of the liquid? A) 1.33 g/mL B) 1.00 g/mL C) 0.752 g/mL D) 0.663 g/mL E) 1330 g/mL

A) 1.33 g/mL

5.21 cm is the same distance as a) 0.0521 m. b) 5.21 mm. c) 0.00521 km. d) 5210 m. e) 52.1 dm.

a) 0.0521 m.

The strongest interactions in the compound sodium fluoride, NaF, are examples of: a) Ionic bonds b) Covalent bonds c) Hydrogen bonds d) dipole-dipole bonds e) dispersion forces

a) Ionic bonds

The octet rule indicates that a) atoms lose, gain, or share valence electrons to have eight valence electrons. b) the noble gases react with other compounds to get eight valence electrons. c) all of the noble gases have eight total electrons. d) all of the shells in an atom hold a maximum of eight electrons. e) all of the Group A elements have eight valence electrons.

a) atoms lose, gain, or share valence electrons to have eight valence electrons.

How many kilograms are in 30.4 lb? a) 66.88 kg b) 13.8 kg c) 14 kg d) 66.9 kg e) 67 kg

b) 13.8 kg

650. J is the same amount of energy as: a) 1550 cal. b) 155 cal. c) 2.72 cal. d) 2720 cal. e) 650 cal.

b) 155 cal.

In an electron-dot structure of an element, the dots are used to represent: a) the electrons that the element will gain when it forms a compound. b) the valence electrons. c) only the electrons that will participate in bond formation. d) all of the electrons in the atom. the electron arrangement.

b) the valence electrons.

A chemical equation is based when: a) The number of atoms of each element is the same in reactants and products b) The charge on each atom is the same in reactants and products c) The total number of ions is the same in reactants and products d) The total number of molecules is the same in reactants and products

A) The number of atoms of each element is the same in reactants and products

The chemical used to make cans and foil is ________

Aluminium

0.100 mole of lithium has a mass of: A) 0.700g B)6.94g C)0.694g D)0.300g E)3.00g

C)0.694g

What type of reaction is the following? CaCO 3( s) → CaO( s) + O 2( g)

Decomposition

A polar covalent bond is found in which of these compounds? A) F2 B) H2 C) N2 D) NaCl E) H2O

E) H2O

True or False: A stone weights 3.6 lbs has a mass of 7.9 kg

False

True or False: Carbon has six valence electrons

False

True or False: The bond angles in a tetrahedral molecule are 90

False

True or False: The molar mass of chlorine gas is 35.5g

False

True or False: The molar mass of silver 47g

False

True or False: When Zn form Zn2+, that is a reduction

False

The number of dots in its electron dot structure of carbon is

Four

What is the name of SF6?

Sulfur Hexafluoride

True or False: Chromium is a metal

True

True or False: It takes 50cal to raise the temperature of 10g of water by 5.0C

True

True or False: Loss of electrons is an oxidation

True

True or False: Potassium has one valence electron

True

True or False: Protons and electrons have opposite but equal charges

True

True or False: The mass of 0.324 mole of MgCl2 is 30.8

True

True or False: The mass of one mole of water is 18g

True

True or False: Water vapor is gas

True

True or false: The following is a decompositions reaction 2KCLO3--> 2KCL + 3O2

True

Which of the following gives the balanced equation for this reaction? K 3PO 4( aq) + Ca(NO 3) 2( aq) → Ca 3(PO 4) 2 ( s)+ KNO 3( aq) a) K3PO4 + Ca(NO3)2 → Ca3(PO4)2(s) + KNO3 b) 2K3PO4 + Ca(NO3)2 → Ca3(PO4)2(s) + 6KNO3 c) K3PO4 + Ca(NO3)2 → Ca3(PO4)2(s) + 3KNO3 d) 2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2(s) + 6KNO3 e) KPO4 + CaNO3 + KNO3

d) 2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2(s) + 6KNO3

Which of the following measurements are NOT equivalent? a) 183 L= 0.183 kL b) 25mg= 0.025 c) 150. ms= 0.150 s d) 84 cm= 8.4 mm e) 24 dL= 2.4L

d) 84 cm= 8.4 mm

The ionization energy is a) highest for metals in Group 1A (1). b) higher for potassium than for lithium. c)the energy an ion acquires from an electron. d) the energy needed to remove an electron from the outermost energy level. e) higher for chlorine than for fluorine.

d) the energy needed to remove an electron from the outermost energy level.

Which of the following compound contains an ionic bond? a) NH3 b) H2 c) H2O d) CH4 e) CaO

e) CaO

In this reaction what is the substance oxidized? Zn + 2 HCl → ZnCl 2 + H 2 a) zinc chloride b) hydrogen c) chlorine d) oxygen e) zinc

e) zinc