Chemistry Exam #1

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45 m/s = __________ km/hr

1.6 x 10^2

which species has 54 electrons?

128 Te^2- 52

Which pair of atoms constitutes a pair of isotopes of the same element?

14/6 X 12/6 X

which of the following atomic symbols is incorrect?

14/8 N

using the rules of significant figures, calculate the following (6.167+85)/6.10

15

the correct answer (reported to the proper number of significant figures) to the following is 12.75 x 1.3621

17.37

Barium forms an ion with a charge of __________.

2+

express the number 0.000216 in scientific notation?

2.14x10^-4

The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is ________ amu.

220.4

round the number 0.007222 to three significant figures

0.007

The length of the side of a cube having a density of 12.6 g/ml and a mass of 7.65 g is ________ cm.

0.847

osmium has a density of 22.6 g/cm3. what volume (in cm3) would be occupied by a 21.8 g sample of osmium?

0.965

which of the following metric relationships are incorrect

1 gram= 10^3 kilograms

1 picometer = _____ centimeters

1 x 10^-10

the proper formula for hydronium ion is

H3O+

elements in group 7a are known as the

Halogens

what is the formula of the compound formed between strontium ions and nitrogen ions?

Sr3N2

an isotope, X, of a particular element has an atomic number of 16 and a mass number of 34, therefore:

X is am isotope of sulfur and x has 18 neutrons per atom

the agreement of a particular value with the true value is called?

accuracy

An example of a pure substance is

all of these (elements, compounds, pure water, carbon dioxide)

of the following, the smallest and lightest subatomic particle is the

an electron

the correct name for H2CO3 is

carbonic acid

a method of separation that employs a system with two phases of matter, a mobile phase and a stationary phase is called?

chromotography

____ are substances with constant composition that can be broken down into elements by chemical processes

compounds

the law of constant composition applies to

compounds

Copper and chlorine form an ionic compound whose formula is CuCl2. The name of this compound is ________.

cupric chloride

Of the following, the smallest and lightest subatomic particle is the __________.

electron

cathode rays are

electrons

which one of the following is a pure substance?

elemental oxygen

name three methods for the separation of mixtures

evaporation, distillation, filtration and chromotography

(according to 3 archery targets) which of the following represent having high precision?

figure 3 only

the suffix -ide is used primarily ____

for monatomic anion names

A combination of sand, salt, and water is an example of a

heterogenous mixture

for which of the following can the composition vary?

heterogenous mixture

A solution is also called a

homogeneous mixture

a small amount of salt dissolved in water is an example of a

homogenous mixture

precision refers to

how close a measured number is to other measured numbers

the correct name for HBrO

hypobromous acid

Elements ________ exhibit similar physical and chemical properties.

in the same group of the periodic table

a metric unit for length is

kilometer

the correct name for MgF2 is

magnesium fluoride

When a metal and a nonmetal react, the __________ tends to lose electrons and the __________ tends to gain electrons.

metal, nonmetal

Order the four metric prefixes from smallest to largest

nano>milli>centi>kilo

the subatomic particles located in the nucleus with no overall charges are

neutrons

the correct name for HNO2 is

nitrous acid

in which group do all of the elements have the same number of valence electrons?

none of these

Oxygen is a __________ and nitrogen is a __________.

nonmetal, nonmetal

all atoms of a given element have the same

number of protons

in the periodic table the elements are arranged in

order of increasing atomic number

of the following, _____ contains the greatest number of electrons

p3-

alpha particles beamed at thin metal foil may

pass directly through without changing direction, be slightly diverted by attraction to electrons, and be reflected by direct contact with nuclei (A,B,C)

the name of PCl3 is

phosphorus trichloride

the boiling water is a

physical change because the gaseous water is chemically the same as the liquid

the correct name for K2S is

potassium sulfide

The degree of agreement among several measurements of the same quantity is called __________. It reflects the reproducibility of a given type of measurement.

precision

the correct name for NaHCO3 is

sodium bicarbonate

The state of matter for an object that has both definite volume and definite shape is

solid state

in the symbol below, x/6 C is

the atomic number

in the following list only ______ is not an example of a chemical reaction?

the condensation of water vapor

in the rutherford nuclear atom model,

the heavy subatomic particles, protons and neutrons, reside in the nucleus

which of the following is an example of a quantitative observation

the temperature is 60 C

of the following, only ____ is an extensive property

volume

express the volume 239.7 cm^3 in liters

.2397 L

which combination of protons, neutrons, and electrons is correct for the isotope of copper,63 29Cu

29 p+, 34 n., 29 e-

which of the following is (are) the lowest temperature?

30 F

the distance of 33 km =

3300 m

Round the number 3456.5 to two significant figures.

3500

which one of the following is the highest temperature?

38 C

Consider the numbers 23.68 and 4.12. The sum of these numbers has ____ significant figures, and the product of these numbers has ____ significant figures.

4,3

4.90x10^5 J energy is equal to how many kj?

4.90x10^2

The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is ________ amu.

41.54

an object measuring 0.4500 kilograms will have a mass of _____ grams

450.0

5.6 kilograms contain this many grams?

5.6x10^2

there are ___ electrons, ____ protons, and ____ neutrons in a 132/54 Xe

54, 54, 78

7.7 seconds contain how many picoseconds?

7.7x10^12

a 20.0 mL sample of glycerol has a mass of 25.2 grams. what is the mass if a 57 mL sample of glycerol?

72 g

The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus

75 protons and 110 neutrons

the formula for the compound formed between aluminum ions and phosphate ions is

AlPO4

If the Thomson model of the atom had been correct, Rutherford would have observed:

Alpha particles going through the foil with little to no defection

(13 6 X) in the symbol below, X=

C

what is the molecular formula for octane?

C8H18

Which pair of substances could be used to illustrate the law of multiple proportions?

CO, CO2

Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties?

Ca and Sr

explain the main differences between a compound and a mixture

Compounds are those substances which can be created by the chemical combination of two or more elements. Mixtures are those substances that are created by a physical combination of two or more substances.

which one of the following compounds is chromium (III) oxide?

Cr2o3

which of the following compounds is copper(I) chloride?

CuCl

the scientist whose alpha particle scattering experiment led him to conclude that the nucleus of an atom contains a dense center of positive charge is

Ernest Rutherford

which one of the following has the element name and symbol matched correctly

Fe-Iron

Which formula/name pair is incorrect?

Fe2(SO4)3 iron(III) sulfide

the first scientist to show that atoms emit any negative particles was

J.J. Thomson

Which formula/name pair is incorrect?

Mg3N2 magnesium nitrite

Predict the empirical formula of the ionic compound that forms from magnesium and oxygen.

MgO

the charge of an electron was determined in the

Millikan oil drop experiment

which of the following pairs of compounds can be used to illustrate the law of multiple proportions?

NO NO2

of the choices below, which one is not an ionic compound?

PCl5


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