Chemistry Unit 2

Unit 2 Exam Questions and unit two practice worksheets

Does the volume of water increase as it freezes?

Yes

Which of the following slows down a reaction rate?

an increase in temperature

an increase in reactants

a decrease in temperature

an increase in reactants and an increase in temperature

A decrease in temperature

The most abundant fossil fuel in the United States is

Coal

The number of cycles of a wave that passes a stationary point in one second is called its

Frequency

The concentration of which component of the atmosphere has increased dramatically since the beginning of the industrial era?

Carbon Dioxide

Anaerobic degradation of organic material in water systems occurs in the absence of

Dissolved Oxygen

Which of the following is NOT a property of water?

It has a high specific heat.

It dissolves most ionic substances.

It has a higher density in the liquid state than in the solid state.

It has a lower density than most liquids do.

it as a lower density than most liquids do

The SI unit of energy is the

joule

Which among the following statements is TRUE?

As the wavelength increases, the frequency also increases.

As the energy increases, the frequency of radiation decreases.

Red light has a shorter wavelength than violet light.

The wavelength of light is inversely related to its energy.

none of the above

The wave length of light is inversely related to its energy

What comes from many human and natural sources in the enviroment

Radioactivity

heat capacity is a measure of the heat required to

raise the temperature of 1 gram of a substrance by 1 degree celcius

Whats the primary method of wastewater treatment

Settling Pond

Whats the secondary method of waste water treatment

Activated sludge

What’s the tertiary treatment method of wastewater treatment

Reverse Osmosis

Photovoltaic cells convert

solar energy into eletricle energy

Whats the source of energy that powers the sun

Nuclear fusion

Is wood a fossil fuel?

Hell nah

Is petrollium a fossil fuel

yessir

All of the following examples are classified as potential energy EXCEPT

energy in nuclear particles.

energy stored by position.

energy in chemical bonds.

energy of a moving object.

Energy of a moving object. dummy

Lakes and oceans affect climate by moderating variations in air temperature. The property of water moderating temperature variations is its

high heat of vaporization.

density.

surface tension.

boiling point.

high heat of vaporization

what is entropy

A measure of randomness of the distribution of energy.

Carbon monoxide blocks the ability of ________ to bind and transport ________.

hemoglobin, oxygen

Which of the following examples of radiation comes from human-made sources?

nuclear medicine

radioactive decay

carbon-14

internal radiation from within our bodies

uranium

nuclear medicine

The water cycle acts to purify water by

crystallization (freeze-thaw cycle).

filtration.

evaporation and condensation.

All of these act to purify water.

all hoe

Photochemical smog is more likely to occur in cold and wet conditions. true or false

false bitch you thought

A cold pack works by the dissolving of ammonium nitrate in water. Cold packs are carried by athletic trainers when transporting ice is not possible. Is this process endothermic or exothermic? Explain.

Endothermic; the process absorbs heat from the surroundings

State the first law of thermodynamics.

Energy is neither created nor destroyed; it is changed from one form to another.

Which process is an example of entropy decreasing?

Oil spreads across the surface of water.

Wood burns in an open pit.

Steam condenses to liquid water.

Sugar dissolves in coffee.

Steam condenses to liquid water.

Whats entropy

In chemistry, entropy is a measure of the disorder or randomness of a system at the molecular level. It describes how energy is distributed among particles and how likely molecules are to exist in a disordered state.

whats the major component of natural gas

methane

which country leads the percentage of electricity produced by nuclear energy

france

What weather conditions are associated with industrial smog?

Check all that apply.

cool

cloudy

clear

sunny

damp

cool, cloudy, damp bitch

Which one of the following types of electromagnetic radiation has a higher energy per photon than ultraviolet radiation?

X-ray

radio

infrared

microwave

none of the above

xrayyyy

Whats a substance that burns readily and releases significant amounts of energy

fuel

Which gas is primarily responsible for the green house effect

carbon dioxide

All of the following contribute to increasing indoor air pollution levels EXCEPT

gas kitchen stoves.

mold.

improving insulation and sealing air leaks around windows and doors.

All of the above contribute to increasing indoor air pollution.

All of the above contribute to increasing indoor air pollution.

Which part of the automobile is responsible for lowering the HC, CO, and NO_x emissions by more than 90%?

crankcase ventilation system

control system

modified gas tank

catalytic converter

catalytic converter

What is the role of phytoplankton in the oxygen cycle?

convert oxygen to ozone

consume oxygen and produce carbon dioxide

consume carbon dioxide and produce oxygen

rust metal

consume carbon dioxide and produce oxygen

What is ionizing radiation?

Ionizing radiation is radiation with enough energy to detach the neutrons from atoms and molecules, converting them into ions.

Ionizing radiation is radiation with enough energy to detach the protons from atoms and molecules, converting them into the new element.

Ionizing radiation is radiation with enough energy to detach the electrons from atoms and molecules, converting them into ions.

Ionizing radiation is radiation that releases energy when an electron is added to a neutral atom or molecule to form a negative ion.

Ionizing radiation is radiation with enough energy to detach the electrons from atoms and molecules, converting them into ions.

Which of the following situations would be an example of kinetic energy?

a batter waiting for the ball to be pitched

a tank of gasoline

a compressed spring

a nuclear explosion

a nuclear explosion

The industrial fixation of nitrogen to produce nitrogen fertilizers has drastically increased food supply primarily because

the availability of fixed nitrogen is often a limiting factor in plant growth.

plants fix nitrogen slowly.

plants need nitrogen.

nitrogen in the atmosphere has decreased over the past two centuries.

the availability of fixed nitrogen is often a limiting factor in plant growth.

Which activity accounts for the largest percentage of water usage?

coolant for electric power plants

industrial

irrigation

public water supplies

coolant for electric power plants

whats the primary element in coal

carbon betch

a major inconvience of coal as a fuel is that its a (what state of matter)

solid

Which form of electromagnetic radiation has the shortest wavelength?

Radio Waves

Microwaves

X-rays

Gamma Rays

Infrared Radiation

Gamma Rays

The fastest growing energy source in the United States is

wind power.

geothermal.

hydroelectric power.

biomass.

wind power

The distance between adjacent wave crests is called:

trough.

nu.

frequency.

wavelength.

none of the above

wavelength

The layer of the atmosphere that is closest to the surface of the earth is the

TROPOSPHEREEEEE

What is a electrochemial cell