Chem Exam 1

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Which of the following numbers contains three significant figures?

0.00230

The number 8.72 × 10⁻³ when taken out of scientific notation would be

0.00872

The number 6.11 × 10⁻² when taken out of scientific notation would be

0.0611

Perform this mathematical operation and express the answer to the correct number of significant figures: 0.085631 × 1.32

0.113

Which of the following represents an exact quantity?

1 inch is 2.54 centimeters

Which of the following temperatures is the coldest?

100K

How many carbon atoms are in 19 molecules of benzene, C₆H₆?

114

A large stone weighs 53.0 kg How many pounds does it weigh?

117 pounds

How many hydrogen atoms are in 27 molecules of diborane, B₂H₆?

162

3.42 + 45.96/0.21 =

220

How many significant figures does the number 67,200 have?

3

The number 4040 has ___ significant figures.

3

The number 64800 has ___ significant figures.

3

How many significant figures does the number 1.006 × 10⁷ have?

4

How many significant figures would this calculation have if it were completed: (9.04 - 8.23 + 21.954 + 81.0) × 3.1416

4

The number 6.040 has ___ significant figures.

4

How many significant figures does the number 0.054901 have?

5

How many significant figures does the number 23.070 have?

5

What is the correct IUPAC name for CoCl₂ ?

Cobalt(II)chloride

Write the chemical formula for copper(II) perchlorate hexahydrate

Cu(CIO4)2 time 6H2O

A molecule has an empirical formula of CH, and its molar mass is known to be 26 g/mol. What is its molecular formula?

C₂H₂

Determine the correct formula for iron(III) perchlorate.

Fe(ClO₄)₃

Ionic bond

Formed when one or more electrons are transferred from one atom to another

Write the chemical formula for dinitrogen tetroxide

N2O4

Classify the following compounds as ionic or covalent: BaO, Fe₂O₃, ZnO.

all three ionic

What is the correct IUPAC name for AlBr₃?

aluminum bromide

The symbol Cr represents the element _____

chromium

What is the name of the SI unit for length?

meter

Which of the following is a step that is NOT in the scientific method?

modifying laws

Carbon dioxide is a _____ compound composed two types of _____ atoms.

molecular; nonmetal

Rutherford's gold foil experiment determined that

most of the space in an atom is empty except for a concentrated area called the nucleus.

What is the correct IUPAC name for HNO₂(aq)?

nitrous acid

Neutral atoms of all isotopes of a given element have the same

number of electrons

Which of the following is the first step in the scientific method?

observation

The atomic mass of germanium (Ge) on the periodic table is 72.630 amu. Which of the following best explains why the atomic mass is a fraction between 72 and 73?

presence of different isotopes

The nucleus of an atom contains:

protons and neutrons

A homogeneous mixture is also called a ____________.

solution

Ignoring the sign, which has a greater magnitude of charge?

they have equal charges

What does the mass number of an atom represent?

total number of protons and neutrons in the atom

Which of the following numbers contains four significant figures?

3.101

The number 3780000 written in scientific notation would be

3.78 × 10⁶

How many significant figures does the number 48.050 have?

5

Express the number 554,780,000,040 in scientific notation to three significant figures.

5.55 × 10¹¹

Which of the following numbers contains five significant figures?

50.260

The number 0.00000620 written in scientific notation would be

6.20 × 10⁻⁶

The number 0.000741 written in scientific notation would be

7.41 × 10⁻⁴

covalent bond

A chemical bond that involves sharing a pair of electrons between atoms in a molecule

Which of the following does NOT describe the element bromine (Br)?

A metalloid, Bromine (Br) is in group 7A (17) making it a halogen. This also means it is a main group element as well as a nonmetal.

Which of the following best defines a scientific theory?

A model used to explain how or why a phenomenon occurs.

Which of the following best defines a scientific law?

A unifying concept; often a mathematical description of the way in which a natural phenomenon occurs.

Which of the following is a covalent compound? A) H₂O₂ B) Na₂S C) CuCl₂ D) CaO

A) H2O2

How do you convert a Celsius temperature to Kelvin?

Add 273.15

If you go mini-golfing, in which of these scenarios are you precise but not accurate?

All of your shots are off, but they all go to the same place.

The element symbol for arsenic is _____

As

Write the chemical formula for diarsenic trioxide

As2O3

What is the correct formula for barium phosphate?

Ba₃(PO₄)₂

Which of the following is an alkaline earth metal?

Beryllium, The alkaline earth metals are found in Group 2 and include Be, Mg, Ca, Sr, Ba, and Ra.

Polystyrene is made up of a series of styrene (C₈H₈) monomer units. What is the empirical formula for styrene?

CH

Which of the following is a covalent compound? A) RbCl B) CO C) MgS D) TiO

CO

Write the chemical formula for calcium chloride

CaCl2

What is the correct formula for calcium oxide?

CaO

Dalton's atomic theory contains the following hypotheses:

Elements are composed of atoms. ∙∙ Compounds are composed of atoms of more than one element. ∙∙ A chemical reaction involves the rearrangement of atoms. ∙∙ All atoms of a given element are identical. ∙∙ Atoms are indestructible.

Write the chemical formula for the hydrogen phosphate ion

HPO4^-2

Classify the following compounds as ionic or covalent: KCl, CrCl₃, Cl₂O

Ionic, ionic, covalent.

What is the formula of a compound containing K⁺ and O²⁻ ions?

K₂O

How do you convert a Celsius temperature to Fahrenheit?

Multiply by 9/5 and then add 32

Write the chemical formula for ammonium hydroxide

NH4OH

Write the chemical formula for the ammonium ion

NH^4+

The element symbol for nickel is _____

Ni

Which scientist determined the charge of the electron?

Robert Millikan

What is the empirical formula of a molecule containing four sulfur atoms and four fluorine atoms?

SF

Of the following compounds, which contains a metalloid?

SiF4

What element has the symbol Ag?

Silver

What is the correct IUPAC name for AgI?

Silver Iodide

Which of the following is a transition metal?

Silver, Transition metals are found in the d-block of the periodic table.

How do you convert a Kelvin temperature to Celsius?

Subtract 273.15

How do you convert a Fahrenheit temperature to Celsius?

Subtract by 32, then multiply by 5/9

When methane is completely combusted in oxygen forming carbon dioxide and water, how does the mass of the reactant gases compare to the products?

The masses of the reactants and products are equal.

Which is true about one formula unit of CaBr₂?

There is 1 positive Ca ion and 2 negative Br ions.

What is the correct IUPAC name for Al(NO₂)₃?

aluminum nitrate

What is the correct IUPAC name for AlPO₄?

aluminum phosphate

What is the correct IUPAC name for BrCl₃?

bromine trichloride

What is the correct IUPAC name for CrBr₃?

chromium(III) bromide

Density is defined as mass _____________ volume.

divided by

The net charge on an atom of a given element changes as ______ are added or removed.

electrons

What element has the symbol Ge?

germanium

Columns on the periodic table are known as

groups

A human is an example of a(n)

heterogeneous mixture

Italian dressing contains olive oil and vinegar, which will separate out from each other if left to sit. This makes the dressing a

heterogeneous mixture

Grape juice is an example of a(n)

homogeneous mixture

Which of the following terms describes what a doctor forms when treating patients prior to ordering medical tests?

hypothesis

Which of the following lists metric prefixes in order from largest to smallest?

kilo-, deci-, centi-, milli-


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