Exam 1

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Question #1

What answer correctly shows atoms of the following compound Al2(SO4)3?

A 2 aluminum, 1 sulfur and 12 oxygen

B 2 aluminum, 3 sulfur and 4 oxygen

C 2 aluminum, 1 sulfur and 4 oxygen

D 2 aluminum, 2 sulfur and 4 oxygen

E 2 aluminum, 3 sulfur and 12 oxygen

Question #2

What measurement 1 × 10-6 prefix means?

A nano

B macro

C micro

Question #3

There is an element with 38 protons, 38 electrons, and 48 neutrons. What would be the aproximate atomic mass of the element

A 86 amu.

B 38 amu.

C 20 amu.

D 60 amu.

Question #4

How many electrons will nitrogen gain to acheive nearest nobel gas electron configuration?

A 4

B 5

C 3

D 6

Question #5

There is an element with three isotopes.
The masses and the abundances are given below.
Isotope 1: 27.977 amu (0.9222)
Isotope 2: 28.974 amu (0.0469)
Isotope 3: 29.974 amu (0.0310).
Determine the atomic weight of the element.

A 28.09 amu

B 86.93 amu

C 66.94 amu

D 28.98 amu

E 83.93 amu

Question #6

There is a mixture with more than two components. Each component is evenly distributed. This mixture is known as.

A homogeneous mixture

B heterogeneous mixture

Question #7

A statement that includes a measurement or number is a:

A law.

B model.

C quantitative statement.

D qualitative statement.

E hypothesis.

Question #8

Which compound is not an organic compound?

A CH4

B C6H14

C CO2

D CH3OH

E C2H2

Question #9

Find the molar mass of Ca(OH)2

A 74.09 g/mol

B 79.09 g/mol

C 70.9 g/mol

D 73.05 g/mol

Question #10

Which is the best definition of a pure substance?

A A material that has been heated

B A material in the gas phase

C A material whose properties cannot be changed by further physical separation

D A material that contains two or more types of atoms

E A material whose properties have been measured

Question #11

Mass of an unknown sample is 0.1265 kg. if its volume is 6.60 cm3. What would be the identity of an unknown sample?

A iron (density = 7.86 g/cm3)

B silver (density = 10.5 g/cm3)

C gold (density = 19.2 g/cm3)

D Titanium (density = 0.0187 g/cm3)

E mercury (density = 13.6 g/cm3)

Question #12

Give an example of a Alkaline Earth Metal.

A Ni, Rb, Co

B Be, Mg, Ca, Sr, Ba, Ra

C Fe, Kr, Fr

D Ti, At, Fr

Question #13

Which of the following describes a chemical change?

A Ethanol boils when heated.

B Ethanol has a high heat capacity.

C Ethanol evaporates quickly at room temperature.

D Ethanol is a clear, colorless liquid.

E Ethanol can be produced by the fermentation of grapes.

Question #14

An organic compound has an empirical formula of C2H3O and had an approximate molecular weight of 86. What is its molecular formula?

A C8H12O4

B C4H6O2

C C10H14O5

D C6H8O3

E C2H3O

Question #15

From the given elements below which one is not a metal?

A sulfur (S, atomic number 16)

B lithium (Li, atomic number 3)

C calcium (Ca, atomic number 20)

D uranium (U, atomic number 92)

E nickel (Ni, atomic number 28)

Question #16

Aspirin, C9H8O4 is used as an important drug in medical field. How many carbon atoms would contain in 325 mg of aspirin?

A 1.80 × 10−3

B 1.09 × 1021

C 1.96 × 1023

D 9.78 × 1021

E 3.17 × 1026

Question #17

Which of the following cannot be the symbol of an element?

A At

B Fr

C RN

D Os

E Kr

Question #18

Match with the correct answer. PCl3

A Molecular compound

B ionic compound

Question #19

Match with the correct answer. NaF

A ionic compound

B Molecular compound

Question #20

Match with the correct answer. H2S

A ionic compound

B Molecular compound

Question #21

Match with the correct answer. MgO

A ionic compound

B Molecular compound

Question #22

Which substance is most highly compressible?

A water

B air

C alcohol

D wood

E aluminum

Question #23

Which statement is not true about a Ni sample that has 8.90g in 1 mL ?

A The density of a 2 mL sample would be the same as the 1 mL sample.

B The density of a 2 mL sample would be twice that of the 1 mL sample.

C The density of a 17.80 g sample of nickel would be twice that of the 8.90 g sample.

D The density of a 4.45 g sample of nickel would be half that of the 8.90 g sample.

E The density of a 2 mL sample would be half that of the 1 mL sample.

Question #24

Which of the following statement contains both a quantitative and a qualitative information?

A The compound formed pale yellow crystals.

B The compound has a mass of 14.62 g.

C The reaction produced 112 g of a pure white solid.

D The drug is 92.5% pure.

Question #25

Which of the following formulas is correct?

A Na2HPO4

B Ca2CO3

C MgNO3

D AlCl3

E K3ClO4

Question #26

Determine the mass percent oxygen in Al2O3.

A 26.5%

B 54.0%

C 52.9%

D 47.1%

E 40.0%

Question #27

You may have heard that when water freezes it is important to keep some empty space in the container. You may check the accuracy of that statement by following calculations.
According to the following data what would be the volume of ice?

225 mL of water at 25°C is frozen at 0.0°C,
(Density of water at 25°C = 0.997 g/mL; density of ice at 0.0°C = 0.917 g/mL)

A 207 mL

B 224 mL

C 225 mL

D 226 mL

E 245 mL

Question #28

The temperature of an patient is 100°F. Correctly estimating this temperature in Celsius.

A T (0C)= (100-30) /1.8 = 30 0C

B T (0C)= (100-64) /1.8 = 37 0C

C T (0C)= (100-32) /1.8 = 38 0C

Question #29

Which compound is likely to be molecular?

A ZnCl2

B K2O

C CaF2

D EuCl3

E SF4

Question #30

A sample contains two carbons, six hydrogens, and one oxygen. Write its chemical formula.

A C2H6O

B 2C26H6O

C 2C6HO

Question #31

A hydrocarbon contains 79.89% carbon and the remainder hydrogen. Determine the empirical formula of the compound.

A CH

B C3H

C CH3

D C3H3

Question #32

Color of a matter is considered as a _____________ property.

A molecular

B exterior

C appearance

D physical

Question #33

Which one of the following elements is not a transition metal?

A Rb

B Zn

C Ti

D Ni

E Co

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