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Which of the following is not the same as 12.5 millimeters? 0.0000125 km 0.00125 hm 0.0125 m 1.25 cm

0.00125 hm

Which of the following is not equal to 120 centimeters? 0.0012 kilometer (km) 0.012 dekameter (dkm) 1.2 meters (m) 1,200 millimeters (mm)

0.012 dekameter (dkm)

Which of the following is not the same as 1.69 meters? 0.0169 km 0.169 dkm 169 cm 1,690 mm

0.0169 km

Round 0.0645 g to 2 significant figures:

0.065

Round 0.0952 km to 2 significant figures:

0.095

The number of moles of Cl- ions needed to combine completely with 0.25 moles of Mg+2 ions is:

0.50

Multiply and round to the proper number of significant figures. (0.234 cm)(3.53 cm) =

0.826

1,000 milliliters is the same as:

1 L

kilo-

1,000 times the base unit

mega-

1,000,000 times the base unit

Which of the following is not the same as 1,400 mL? 1,400 cm³ 1.4 L 1.4 cm³ 140 cL

1.4 cm³

milli-

1/1,000 of the base unit

micro-

1/1,000,000 of the base unit

nano-

1/1,000,000,000 of the base unit

centi-

1/100 of the base unit

How many millimeters are there in 1 centimeter?

10

The maximum number of electrons in a single d-subshell is:

10

Which one of the following is not equal to 100 meters? 0.100 kilometer 10 hectometers 10,000 centimeters 100,000 millimeters

10 hectometers

Which of the following is not equal to 0.1 centimeter? 0.000001 kilometer (km) 0.001 meter (m) 10 millimeters (mm) 1,000 micrometers (µm)

10 millimeters (mm)

Multiply and round to the proper number of significant figures. (896.5 cm)(12 cm) =

11,000

The element 238/92 has how many neutrons?

146

The electron configuration of Ne is:

1s22s22p6

Give the number of significant figures: 0.011 cm

2

The first four ionization energies for an imaginary element, Xz, are E1 = 102 kcal, E2 = 186 kcal, E3 = 4021 kcal, and E4 = 4862 kcal. The most probable number of valence electrons as indicated by this ionization data is:

2

Balance the following reaction. If a coefficient of "1" is required, use "blank" in the box.CH3OH +

2 3 2 4

Round 23.455 cm to 4 significant figures:

23.46

Give the number of significant figures: 0.882 mm

3

Give the number of significant figures: 3.10 cm

3

Give the number of significant figures: 6.32 g

3

Give the number of significant figures: 832,000 km

3

3.45 kilometers = _______ micrometer(s)

3,450,000,000

Express in scientific notation. Remember, M must be a number such that 1 ≤ M < 10. 32,400 = _____

3.24*10e4

Give the number of significant figures: 0.01101 cm

4

Give the number of significant figures: 7.110 g

4

Give the number of significant figures: 92.06 kg

4

How many significant figures should the following answer have? (23.34 cm)(90076 cm)(2.1223 cm) = _____

4

The element Ag has how many protons?

47

Which of the following is not equal to 0.536 kilometer? 53.6 hectometers (hm) 536 meters (m) 536,000 millimeters (mm) 53,600 centimeters (cm)

53.6 hectometers (hm)

Carbon-14 has an atomic number of 6. Carbon has how many electrons?

6

Give the number of significant figures: 13,436.0 mm

6

Give the number of significant figures: 369,132,000 sec

6

The maximum number of electrons in a p-sublevel is:

6

The number of valence electrons for 1s22s22p4 is:

6

Round 6.362 cg to 3 significant figures:

6.36

The curves represent two possible reaction paths for the decomposition of ammonia, NH3. One can correctly conclude from the graph that the best explanation for the difference between (I) and (II) is that:

A catalyst was added.

Reaction rates are affected by concentration, collision geometry, and the presence of a catalyst. Which of the following statements is FALSE concerning these factors?

A reaction occurs each time particles of the reactants collide.

The following list contains some common polyatomic ions. Using the charge on these ions and the idea of valence, predict the formulas for the following. nitrate NO3 - phosphate PO4³- sulfate SO4²- acetate C2H3O2 - ammonium NH4 4 chromate CrO4²- carbonate CO3²- dichromate Cr2O7²- permanganate MnO4 - sulfide S²-

Answer Key Na₂CO₃ KMnO₄

Select all that apply. In the vertical columns of the periodic table:

Atomic weight increases from top to bottom. The number of shells increases from top to bottom.

Based upon location in the periodic table, the formula for beryllium (Be) chloride (Cl) is:

BeCl2

Ionization energy and electronegativity are related to the periodic table in that:

Both increase going across a period and up a family.

Select all that apply. Which two of the following equations represent an exothermic reaction?

C(graphite) → C(diamond), ΔH = -0.45 kcal/mole C CH4 + 2O2 → CO2 + 2H2O + 212,800 calv

How is ionization energy, E, related to a group of elements?

E decreases from top to bottom.

The following is the correct orbital configuration for nitrogen: 1s22s22d3.

False

The three aspects of the measuring process are units, systems, and instruments.

False

Pick the TWO true statements from the following: Graduated cylinders are used to measure volume. All graduated cylinders measure liquids with the same precision. Graduated cylinders are the only instruments used to measure volume in the laboratory. Always read a graduated cylinder from the bottom of the meniscus.

Graduated cylinders are used to measure volume. Always read a graduated cylinder from the bottom of the meniscus.

When atoms from Group IA combine with atoms from Group VII:

The bond will be ionic.

Select all that apply. What factor(s) may be responsible for the ionization energy within a period?

The diameter of the atom decreases somewhat as electrons are added. The attractive force of the nucleus increases.

In the vertical columns of the periodic table, as the atomic numbers increase:

The number of electron shells increases.

Consider the two electron arrangements for neutral atoms A and B. What is the difference between atom A and atom B? A - 1s22s22p63s1 B - 1s22s22p65s1

The outer electron of atom B has moved to a higher energy state.

Select all that apply. When the products of a reaction have more energy than the reactants:

The reaction is endothermic. The change in enthalpy is positive.

The requirement that a reversible reaction be at equilibrium is that:

The velocity for the forward reaction equal that of the reverse reaction.

54,000,000 nanometers = 0.000000054 megameter

True

A gamma-ray emission results in the release of energy without any apparent change in mass or nuclear charge.

True

A mole of Cu atoms has the same number of atoms as a mole of He atoms.

True

A negative ΔH means an exothermic reaction.

True

Accuracy is the correctness of a measurement.

True

Polar molecules have an equal number of positive and negative particles.

True

Precision is related to the uncertainty in a measurement.

True

The United States is one of the few countries in the world which has not yet adopted the metric system for general use.

True

The energy necessary to enable a reaction to occur is called the activation energy.

True

The half-lives of unstable isotopes vary from milliseconds to billions of years.

True

The metric system is also called the SI system.

True

Which is more stable?

X + Y

Select all that apply. Which statements concerning this diagram are correct?

X = ΔH

Which of the following changes would decrease the rate of a reaction?

adding more heat to an exothermic reaction

meter

base unit of distance

kilogram

base unit of mass

liter

base unit of volume

Ammonium hydroxide ionizes as follows: NH4OH NH4 + + OH-. If an excess of ammonium salt, such as NH4Cl (which ionizes to give NH4 + ions), is added to the equilibrium shown above, you could predict that the result will be to:

decrease the concentration of OH-

The reaction, Z + Q → X + Y is:

exothermic

Gas formation from a reaction is a phase change, not a chemical change.

false

A 90.00 mL solution of NaCl and ethyl alcohol has 7.83 g of salt dissolved in the alcohol. Calculate the molar concentration of the solution.

h2 2 o2

Consider the equation: 2NO2(g) N2O4(g). Using ONLY the information given by the equation, which of the following changes would increase the molar concentration at equilibrium of the product N2O4(g)?

increase the pressure

Select all that apply. A nonmetal:

is more likely to attract an electron than a metal requires more energy to lose an electron than a metal

Select all that apply. The last element in any period always has:

its outer energy level completed the properties of an inert gas

The measure of distance from one point to another is:

length

The primary unit of length in the metric system is the:

meter

Isotopes

of a given element have different numbers of neutrons

What does the p mean in 1s22s22p63s1?

one of the 4 subshells

The bond between F and Cl would be:

polar covalent

centi-

prefix meaning 1/100

milli-

prefix meaning 1/1000

kilo-

prefix measuring 1000

A covalent bond is formed by the following process:

sharing two electrons between two atoms

Periodicity is best defined as:

the repeating nature of physical and chemical properties with atomic number

Increased concentration increases the reaction rate.

true

The formation of a solid when two liquids are mixed indicates a reaction.

true

When do electrons emit energy?

when moving to a lower orbit from an excited state