Test 1

The base unit for the length in metric system is:
a.cm
b.in
c.m
d.yd

c. m

Which of the following is an exact number?:
a. 7 chairs
b. 10.25 g
c. 60 seconds
d. 4.000 kg

a. 7 chairs

Convert 3.25 mil to km:
a.2.02 km
b. 4.95 km
c. 5.23 km
d. 1.91 km

c. 5.23 km

65 degrees celsius is equal to:
a. 120 degrees Fahrenheit
b. -85 degrees Fahrenheit
c. 85 degrees Fahrenheit
d. 149 degrees Fahrenheit

d. 149 degrees Fahrenheit

In the metric system the prefix nano- means
A. 10^-9
B. 10^9
C. 10^12
D. 10^-12

A. 10^-9

Express 0.000840 in scientific notation
A. 8.40 x 10^-3
B. 8.40 x 10^4
C. 8.40 x 10^-4
D. 8.4 x 10^4

C. 8.40 x 10^-4

What is the name of the unit that equals 10^-6:
A.Nano
2. Milli
3. Giga
4.Micro

4. Micro

What is the mass of 20.0 mL solution if its density is 1.84 g/mL?
1) 21.8 g
2) 10.9 g
3) 36.8 g
4) 10.8 g

3) 36.8 g

How many 1 L bottles are required to contain 1 m^3 of liquid? (Hint: 1 cm^3 = 1 mL)
A)1010
B)1000
C)100
D)10

B) 1000

Calculate the volume of 65.0 g of liquid methanol if its density is 0.791 g/mL.
1)101.7 mL
2)97.4 mL
3)82.2 mL
4)84.2 mL

3)82.2 mL

What are the significant figures in the following:
23.1 + 14.91 + 0.9812 - 5.24
1)33.8
2)33.75
3)33.7512
4)34

1)33.8

What is the state of matter of water at 245 K?
1)Gas
2)Solid
3)Liquid
4)Plasma

2) solid

Earth's oceans contain 1.36 × 109 km^3 water. What is that in liters?
A) 1.36×10^21 L
B) 4.25×10^21 L
C) 4.25×10^-21 L
D) 1.36×10^-21 L

a) 1.36 x10^21 L

What are the significant figures in the following:
(14.0) x (4.520)
1)63.28
2)63.3
3)6.328
4)6.33

2)63.3

The point in temperature and pressure at which a substance may coexist in thermodynamic equilibrium in three phases (gas, liquid, and solid) is called as
1)Double point
2)Triple point
3)Stable point
4)Green point

2) triple point

Of the following name/symbol combinations of elements, which one is WRONG?
(A) uranium/U
(B) sulfur/S
(C) nitrogen/N
(D) iron/I

(D) iron/I

The chemical symbol for manganese is
(a) Mn
(b) Mo
(c) Ma
(d) Mg

(a) Mn

The number 0.005436 has how many significant figures?
(a) 7
(b) 3
(c) 4
(d) 5

(c)4

The number 10.00 has how many significant figures?
(a) 1
(b) 2
(c) 3
(d) 4

(d) 4

Of the following symbol/name combinations of elements, which one is WRONG?
(a) C/carbon
(b) B/barium
(c) F/fluorine
(d) N/nitrogen

(b)B/barium

The elements in a column of the periodic table are known as:
1)nonmetals
2)a period
3)a group
4)noble gases.

3)a group

Which of the following statements about an atom is correct?
1.Elements are the building blocks of atoms.
2.Atoms are visible to the naked eye.
3.Atom is the limit for the chemical subdivision for an element.
4.Only one kind of atom is present in a compound.

3. Atom is the limit for the chemical subdivision for an element

What is the name of the element denoted by the chemical symbol Hg?
A) Helium
B) Mercury
C) Hydrogen
D) Halogen

B) Mercury

The scientist who determined the magnitude of the electric charge of the electron was
A) John Dalton.
B) Robert Millikan.
C) J. J. Thomson.
D) Henry Moseley.

B) Robert Millikan

Which of the following substances is a compound?
A) S8
B) F
C) Co
D) CO

D) CO

Which of these scientists developed the nuclear model of the atom?
A) John Dalton
B) Robert Millikan
C) J. J. Thomson
D) Ernest Rutherford

D) Ernest Rutherford

How many neutrons are there in an atom of lead whose mass number is 208?A) 82
B) 126
C) 208
D) 290

B) 126

Which of these elements is chemically similar to oxygen?
A) sulfur
B) calcium
C) iron
D) nickel

A) sulfur

The Stock system name for CrSO3 is
A) chromium sulfide.
B) chromium(II) sulfite.
C) chromium(II) sulfate.
D) chromium(III) sulfite.

B) chromium(II) sulfite

Which group is called alkali group in periodic table:
A) Group 2
B) Group 1
C) Group 17
D) Group 18

B) Group 1

Magnesium is a member of what family:
A) Alkaline metals
B) Transition metals
C) Halogens
D) Alkali metals

A) Alkaline metals

Which one is organic compound?
A) Ethanol
B) Common Salt
C) Water
D) ZnCl

A) Ethanol

Which of these compounds are ionic:
A) N2O
B) Na2O
C) CaCl2
D) SF4

B and C

Naturally occurring chlorine is 75.78% 35Cl (atomic mass 34.969 amu) and 24.22% 37Cl (atomic mass 36.966 amu). Calculate the atomic weight of Chlorine.
A) 36.966
B) 35.4521
C) 34.969
D) 35.001

B) 35.4521

Determine the number of hydrogen and oxygen atoms involved in a molecule (NH4)2SO4
A) 4, 4
B) 8, 4
C) 2, 4
D) 1, 1

B) 8,4

What is the name of Fe^3+
A) Ferrous ion
B) Ferric ion
C) Furious ion
D) None

B) Ferric ion

1 atomic mass unit (amu) is
A) 1.602 × 10^-19 C
B) 1.66 × 10^-24 g
C) 6.022 × 10^23 g
D) None

B) 1.66 x 10^-24 g

The correct name for KHCO3 is
A) calcium bicarbonate.
B) calcium carbonate.
C) potassium carbonate.
D) potassium hydrogen carbonate.

D) potassium hydrogen carbonate

Two isotopes of an element differ only in their
A) number of electrons.
B) atomic number.
C) atomic mass.
D) number of protons.

C) atomic mass

An aluminum ion, Al^3+, has:
A) 13 protons and 13 electrons
B) 27 protons and 24 electrons
C) 16 protons and 13 electrons
D) 13 protons and 10 electrons

D) 13 protons and 10 electrons

Which of the following is the balanced chemical equation for the combination reaction between lithium metal and oxygen gas?
a) Li(s) + O(g) ->LiO(s)
b) 4 Li(s) + O2(g) ->2Li2O(s)
c) Li(s) + O2(g)-> LiO2(s)
d) 2Li(s) + O2(g)-> 2LiO(s)

b) 4Li(s)+O2(g)->2Li2O(s)

When Na and S undergo a combination reaction, what is the chemical formula of the product?
a) NaS
b) Na2S
c) NaS2
d) Na2S3

b)Na2S

What is the molecular mass of sucrose C12H22O11?
A) 342 g mol^-1
B) 45 g mol^-1
C) 359 g mol^-1
D) 243.03 g mol^-1

A) 342 g mol^-1

Balance the following equation:
___C2H3Cl(l) + ___O2(g) ___CO2(g) + ___H2O(g) + ___HCl (g)
A) 2, 5, 4, 2, 2
B) 2, 5, 4, 4, 2
C) 2, 5, 2, 2, 2
D) 5, 2, 4, 2, 2

A) 2, 5, 4, 2, 2

Calculate the number of carbon atoms in 25.0 grams of isopropyl alcohol (C3H8O)
A) 1.25 C atoms
B) 2.51 x 10^23 C atoms
C) 7.52 x 10^23 C atoms
D) 2.07 x 10^-24 C atoms

C) 7.52 x 10^23 C atoms

How many mL of 17 M NH3 must be diluted to 500.0 mL to make a 0.75 M solution?
(a) 13 mL
(b) 22 mL
(c) 39 mL
(d) 73 mL

(b) 22mL

How many grams of NH3 can be prepared from 77.3 grams of N2 and 14.2 grams of H2? (Hint: Write and balance the equation first.)
(a) 93.9 g
(b) 79.7 g
(c) 47.0 g
(d) 120.0 g

(b) 79.7

H2(g) + O2(g)-> H2O(l) Calculate number of moles of H2O produced from 1.57 mol of O2.
a) 3.14 mol
b) 4.13 mol
c) 3.43 mol
d) 1.43 mol

a) 3.14 mol

The overall equation involved in photosynthesis is: 6CO2(g) + 6H2O(l) ->C6H12O6(s) + 6O2(g)
How many grams of glucose form when 4.40 g of CO2 are converted to sugar?
a) 18.0 g
b) 3.00 g
c) 108 g
d) 0.0167 g

b) 3.00 g

Balance the following equation using minimum integral coefficients:NH3 + O2 NO2 + H2O
The stoichiometric coefficient for oxygen gas O2 is:
(a) 1
(b) 4
(c) 3
(d) 7

(d) 7

How many sulfur atoms are in 0.45 mol BaSO4?
a) 6.02 x 10^23
b) 2.7 x 10^23
c) 2.7 x 10^-23
d) 14.4

b) 2.7 x 10^23

Two beaker contain equal masses of CCl4 and NH3, respectively. Which beaker contains more molecules?
a) the beaker with CCl4
b) the beaker with NH3
c) the beakers contain the same number of molecules
d) none of them

b) the beaker with the NH3

An aqueous solution of caffeine contains 0.186 mol of caffeine. When the caffeine is separated from the rest of the solution, it is found to have a mass of 36.1 g. What is the molar mass of caffeine?
a) 0.00515 g/mol
b) 36.1 g/mol
c) 186 g/mol
d) 194 g/mol

d) 194 g/mol

Dissolving a solute in a solvent does not change its:
(A) Specific heat
(B) Vapor pressure
(C) Viscosity
(D) None of these

(D) None of these

The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 × __________.
(A) 10^26
(B) 10^23
(C) 10^20
(D) 10^19

(C)10^20

How many grams of calcium fluoride contain 38 grams of fluoride atoms?
(A) 39 grams
(B) 78 grams
(C) 38 grams
(D) 57 grams

(B) 78 grams

How many moles of chloride ions are present in a 66.7 gram sample of AlCl3?
(A) 0.5 moles
(B) 1.0 mole
(C) 1.5 moles
(D) 2.0 moles

(C) 1.5 moles

When the following equation is balanced, the coefficients are __________.
Al(NO3)3 + Na2S → Al2S3 + NaNO3
(A) 2, 3, 1, 6
(B) 2, 1, 3, 2
(C) 1, 1, 1, 1
(D) 4, 6, 3, 2

(A) 2,3,1,6

Concentration of a solution expressed in terms of ____________ is independent of temperature.
(A) Molarity
(B) Normality
(C) Molality
(D) None of these

(C) Molality

When the following equation is balanced, the coefficients are __________.
C8H18 + O2 → CO2 + H2O
(A) 2, 3, 4, 4
(B) 1, 4, 8, 9
(C) 2, 12, 8, 9
(D) 2, 25, 16, 18

(D) 2, 25, 16, 18