Chem #1

Which of the following cannot be seperated into a simpler substance by chemical means?

A. ElementB. EmulsionC. CompoundD. Homogenous mixtureE. Heterogenous mixture

If a liquid contains 60% sugar and 40% water throughout its composition then what is it called?

A. SoluteB. CompoundC. Homogenous mixtureD. Heterogenous mixtureE. Solvent

The SI prefixes milli and mega represent, respectively:

A. 10^6 and 10^-6B. 10^-3 and 10^6C. 10^3 and 10^-6D. 10^-3 and 10^9E. 10^-6 and 10^-3

How many milliliters is 0.0055L?

A. 0.55mLB. 5.5 mLC. 0.55 mLD. 0.0000055mLE. 182 mL

How many inches are in 382.5 cm? (1in=2.54cm)

A. 150.6 inB. 6.641x10^-3 inC. 151 inD. 971.6 inE. 972 in382.5 cm x 1in/2.54 cm=150.6

What is the volume of a container that contains 14.3g of a substance having a density of 0.988 g/cm3?

14.5 cm314.3gx 1cm/.988g=14.5g/cm3

if you have a graduated cylinder containing 15.5 mL and this volume changes to 95.2 mL after a metal with a mass of 7.95g is dropped into the graduated cylinder then what is the density of this metal?

9.97x10^-2 g/mL

Radio waves travel at the speed of light which is 3.00x10^8 m/s. How many minutes does it take for a radio message to reach earth from saturn if saturn is 7.9x10^8 km from earth?

44 min7.9x10^8 km x 1sec/3x10^8 m3x10^8/1sec x 60sec/min x 1km/1000= 1.8x10^7 km/min1min/1.8x10^7 km x 7.9 x10^8/1min = 44min

If the temperature is 38F then what is the temperature in Kelvin?

276.5 K38-32/1.8 = 3.34 C3.34C + 273K= 276.5K

Select the answer with the correct number of decimal places for the following sum:13.914 cm+ 243.1 cm + 12.00460 cm=

269.0 cm

Express 122F in C

50.0 C122F-32/1.8=50C

Convert 500 milliliters to quarts. (1L=1.06qt)

0.528 qt500 mlx 1L/1000mlx 1.06 qt/1L = 0.52 qt

After carrying out the operations below, how many significant figures are appropriate to show in the result?(13.7 + 0.027) / 8.221

3 significant figures

The speed needed to escape the pull of earth's gravity is 11.3 km/s. What is this speed in mi/h? (1mi=1609m)

25,300 mi/h11.3km/1hr x 1000 m/1km x 1mile/1609m x 60 sec/min x 60 min/1hr-= 25,300mi/h

The SI base unit of mass is

Kilogram

Acetone, which is used as a solvent and as a reactant in the manufacture of plexiglass boils at 56.1CWhat is the boiling point in degrees Farenheit?

133F1.8 X 56.1 + 32= 133

Which of the following is a chemical change?

Broiling a steak on a grill

The number 6.0448, rounded to 3 decimal places, becomes 6.045True False

TRUE

Matter is anything that has mass and occupies spaceTrue False

TRUE

When applying the scientific method, a model or theory should be based on experimental data.True False

True

The scientist who determined the magnitude of the electric charge of the electron was

Robert Millkan

Which of the following is a type of radioactive radiation which has no charge and are unaffected by externalelectric or magnetic fields?

Y Rays

Which of these scientists developed the nuclear model of the atom?

Ernest Rutherford

Which one of the following statements about atoms and subatomic particles is correct?

A neutral atom contains equal numbers of protons and electrons

Atoms of the same element with different mass numbers are called

Isotopes

How many neutrons are there in an atom of lead whose mass number is 208?

126208-82=126

Give the number of protons (p), electrons (e), and neutrons (n) in one atom of Chlorine-37

17p, 17e, 20n

A magnesium ion, Mg2+, has

12 protons and 10 electrons

An oxide ion, O^2-, has

10 protons and 8 electrons

The elements in a column of the periodic table are known as

a group

Which of the following is a non-metal?

bromine, Br, Z=35

Which of these elements is chemically similar to magnesium?

Calcium

Which of the following is the empirical formula for hexane, C6H14?

C3H7

The compound, P4S10, is used in the manufacture of safety matches. What is its name?

Tetraphosphorus Decasulfide

Tetrasulfur dinitride decomposes explosively when heated. What is it's formula?

S4N2

An anion is defined as

A charged atom or group of atoms with a net negative charge.

Which pair of elements would be most likely to form an ionic compound?

F and Al

What is the formula for the ionic compound formed by calcium ions and nitrate ions?

Ca (NO3)2

What is the formula for the ionic compound formed by calcium and selenium?

CaSe

The formula for magnesium sulfate is

MgSO4

Potassium permanganate is a strong oxidizer that reacts explosively with easily oxidized materials. What is it's formula?

KMnO4

What is the name of Mn(CO3)2?

Maganese (IV) carbonate

Iron (III) Chloride hexahydrate is used as a coagulant for sewage and industrial wastes. What is it's formula?

FeCl3 6H2O

Which of the follwoing are allotropes?

diamond and graphite

Which of these elements is chemically similar to potassium?

Cesium

What is the correct name for ClO3-

Chlorate Ion

A compound with an -OH functional group is called

Alcohol

An alkane with eight carbons would be called

Octane

How many hydrogen atoms are in the propane compound?

8C3H8

What is the formula for Aluminum Oxide?

Al2 O3