Exam I CHE106

Round the number 1027.538 to four significant figures and express the result in standard scientific notation

1.028 x 10^3

What would be a comfortable room temperature in Celsius?

25 degrees

Which of the following is the same as 0.001 cm? A) 0.01 mm B) 100 m C) 0.1 dm D) 0.01 km E) 0.00001 dm

A) 0.01 mm

Which of the following numbers has the most significant zeroes? A) 0.00000020510 B) 6.023 x 10^23 C) 0.08201 D) 4.08400 x 10^-7 E) 0.01020

D) 4.08400 x 10^-7

Which of the following is an extensive property? A) density of lead B) boiling point of ethanol C) density of water D) mass of sodium chloride E) melting point of iodine

D) mass of sodium chloride

Of the following, only _____________ is a chemical reaction. A) crushing aspirin B) Kool-Aid dissolving in water C) sugar melting D) silver tarnishing E) ice melting in water

D) silver tarnishing

Which of the following is an illustration of the law of definite proportions? A) water is a compound B) water can be separated into other substances by chemical processes C) the boiling point of water is constant D) water is 11% hydrogen and 89% oxygen by mass E) water occurs naturally on Earth in all three states

D) water is 11% hydrogen and 89% oxygen by mass

A 1.0 mL volume of seawater contains about 4.0 x 10^-12 g of gold. The total volume of ocean water is 1.5 x 10^21 L. Calculate the amount of gold (in pounds) that is present in seawater. There are 454 g in one pound. A) 2.7 x 10^15 lbs B) 6.0 x 10^12 lbs C) 1.2 x 10^30 lbs D) 1.3 x 10^4 lbs E) 1.3 x 10^10 lbs

E) 1.3 x 10^10 lbs

The isotope cesium-133 has ____ protons, _____ neutrons, and _____ electrons. A) 29 protons, 104 neutrons, 104 electrons B) 55 protons, 133 neutrons, 55 electrons C) 78 protons, 78 neutrons, 49 electrons D) 133 protons, 78 neutrons, 133 electrons E) 55 protons, 78 neutrons, 55 electrons

E) 55 protons, 78 neutrons, 55 electrons

Of the following, the smallest and lightest subatomic particle is the _____________. A) proton B) neutron C) atom D) alpha particle E) electron

E) electron

Name one scientist discussed in lecture this semester and accurately describe their experiment and/or contributions to the topics relating to chapters 1 and/or 2

Rutherford discovered the proton in his gold foil experiment. In the experiment, alpha particles were shot at a thin gold foil, and a small number of molecules scattered, which made him believe a small part of the atom contained most of the mass. This part of the atom is the nucleus.

Provide the correct name for CaCl2

calcium chloride

Provide the correct name for CCl4

carbon tetrachloride

Provide the correct name for H2CO3

carbonic acid

Provide the correct name for S2F6

disulfur hexafluoride

Element, compound, homogeneous solution, or heterogeneous mixture: copper wire

element

A cube which measures 3.00 cm on each side has a mass of 24.3 grams. Will it sink or float in 500.0 mL water at 25°C which has a density of 1.00 g/mL?

float

Element, compound, homogeneous solution, or heterogeneous mixture: wood

heterogeneous mixture

Element, compound, homogeneous solution, or heterogeneous mixture: paint

heterogeneous solution

Element, compound, homogeneous solution, or heterogeneous mixture: air in this room

homogeneous solution

Element, compound, homogeneous solution, or heterogeneous mixture: soft drink

homogeneous solution

Provide the correct name for HCl

hydrochloric acid

Provide the correct name for HF

hydrofluoric acid

Provide the correct name for NiCO3

nickel (ii) carbonate

Provide the correct name for HNO3

nitric acid

Provide the correct name for HClO4

perchloric acid

Provide the correct name for PH3

phosphorus trihydride / phosphine

Provide the correct name for K2SO4

potassium sulfate

The periodic table is arranged according to ____________. A) atomic mass B) atomic number C) number of neutrons D) number of electrons E) isotope number

B) atomic number

Which of the following can be easily separated into individual components using physical processes such as filtering or decanting? A) pure substances B) heterogeneous mixture C) homogeneous mixture D) compounds E) elements

B) heterogeneous mixture

You prepare 1000 mL of lemonade and transfer it to a 1.00 quart pitcher for serving. Which of the following statements applies if 1 L = 1.06 qt? A) The pitcher will be filled to 100% capacity with no lemonade spilled B) The pitcher will be filled to about 95% capacity C) The pitcher will be completely filled and a small amount of lemonade will overflow D) The pitcher will be completely filled and most of the lemonade will overflow E) The pitcher will be half filled

C) The pitcher will be completely filled and a small amount of lemonade will overflow

A substance occupies 65.2 mL in a stoppered 250 mL Erlenmeyer flask at 25* C. Which statement must be correct regarding the substance? A) The substance cannot be a solid because it would occupy less than 65.2 mL B) The substance must be a liquid because it has a volume C) The substance cannot be a gas because it does not occupy the full volume of the flask D) The substance must be a solid because it takes the shape of the container E) The substance is not matter

C) The substance cannot be a gas because it does not occupy the full volume of the flask

Which of the following is an isotope of ^(60)Co? A) ^(32)P B) Co^(3+) C) ^(58)Co D) chalcogens E) halogens

C) ^(58)Co

What would be the best unit to record the volume of a liquid required for a cookie recipe? A) liter B) gram C) milliliter D) kilogram E) gallon

C) milliliter

Which of the following can be separated into other substances by physical means? A) copper wire B) water C) salt water D) an atom E) none of these

C) salt water