chapter 2 chem

Choose the proper coefficients for each substance to balance this equation ___ C2H4(g) + ___ O2(g) → ___ CO2(g) + ___ H2O(g)

1, 3, 2, 2

Choose the proper coefficients for each substance to yield a balanced equation.

2,1,2

What numbers belong in the blank spaces to fully balance the following reaction? __Fe (s) + __Cl₂ (g) → __FeCl₃ (s)

2,3,2 - Matter is conserved in a chemical reaction. Balanced equations contain the same number of atoms of each element on each side of the equation. A coefficient of 2 in front of Fe, a coefficient of 3 in front of Cl₂, and a coefficient of 2 in front of FeCl₃ yield the same number of Fe and Cl atoms on both sides of the equation.

Which of the following would be described as "fine particles"?

2.5 μm diameter soot - remember that these are solids and not gases

Which is the correct balanced equation for the complete combustion of ethane, C2H6, in excess oxygen?

2C2H6 + 7 O2 → 4 CO2 + 6 H2O

Balance the following chemical equation (if necessary) for the combustion reaction of glucose: C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(g)

2C6H12O6 (s) +12O2 (g) --> 12CO2 (g) +12H2O (g)

Balance the following chemical equation (if necessary): Ca(s) +O2 (g) --> CaO (s)

2Ca(s) + O₂(g) → 2CaO(s)

What is the coefficient in front of the NO when the equation below is balanced? NH₃(g) + O₂ (g) → NO(g) + H₂O (g)

4 - Matter is conserved in a chemical reaction. Balanced equations contain the same number of atoms of each element on each side of the equation. The balanced equation for this reaction is: 4 NH₃(g) + 5 O₂ (g) → 4 NO(g) + 6 H₂O (g).

An inversion layer happens when a certain weather pattern traps cooler air near the surface of the earth with a warmer air mass above it. Why is this a problem?

Air pollution concentrates in the inversion layer.

All of these pollutants can be detected by their odors except A. CO B. O3 C. SOx D. NOx

CO -Remember that you might need a detector for this substance in your home for protection.

Which chemical components are given off in car exhaust?

CO2, H20, NOx - all of these choices are correct

Balance the following chemical equation (if necessary) for the combustion reaction of propane: C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g)

C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g)

Balance the following chemical equation (if necessary): C₆H₆O(l) + O₂(g) → H₂O(g) + CO₂(g)

C₆H₆O(l) + 7 O₂(g) → 3 H₂O(g) + 6 CO₂(g)

Which is the balanced chemical equation showing hydrogen peroxide (H2O2) decomposing into hydrogen (H2) and oxygen (O2)?

H2O2 --> H2 +O2

Which of the following statements about subatomic particles are true? I. Protons and electrons have charges of opposite signs but the same magnitude. II. Protons have twice the mass of neutrons. III. Electrons are lighter than neutrons.

I and III - Protons and electrons have charges of opposite signs but the same magnitude; electrons are lighter than neutrons.

Which of the following statements about subatomic particles are false? I. Neutrons reside inside of the nucleus. II. The atomic number is equal to the number of neutrons in the nucleus of an atom. III. Electrons are more massive than protons.

II and III only - Statements II and III are false. True versions of those statements might be: The atomic number is equal to the number of protons in the nucleus of an atom, and protons are more massive than electrons.

which substance is not considered to be an air pollutant?

N2 - one of these is the primary component of uncontaminated air while the rest are pollutants - substance that is air pollutant: SO2, NO2, O3

Which is the balanced chemical equation for the reaction of nitrogen (N2) with oxygen (O2) to form NO?

N2 + O2 --> 2NO

Balance the following chemical equation (if necessary): PbCO3 (s) --> PbO (s) + CO2 (g)

PbCO₃(s) → PbO(s) + CO₂(g)

Currently, the primary source of sulfur dioxide emissions into the atmosphere is

coal burning power plants

air is a(n)

mixture - several substances in air

Ozone is a secondary pollutant. A secondary pollutant is

not produced directly but as the product of the interaction of two or more pollutants. - This has nothing to do with safety.

The burning of coal produces sulfur dioxide, SO2, a pollutant that slowly reacts in air to form SO3. Sulfur trioxide dissolves into airborne water droplets to form a very corrosive solution of sulfuric acid. Which is a product of burning coal that hastens the transformation of sulfur dioxide into sulfur trioxide?

particles of ash

What fundamental force is responsible for holding together the subatomic particles of an atomic nucleus?

strong nuclear force

Green chemistry is

the design of products and processes that reduce hazardous substances.

Which shows the balanced equation for the reaction of nitrogen ( black), as it is normally found in our atmosphere, with oxygen ( white), as it is normally found in our atmosphere, to form nitrogen dioxide?

the image is the picture

When assessing the risk of an air pollutant, which does not play a role in considering someone's exposure to the pollutant?

the toxicity of the pollutant

what two factors are considered when determining the risk assessment for air pollutants?

toxicity and exposure - Remember that some things are poisonous in a short time frame and others are toxic after long time frames.

ozone is considered an air pollutant in the ______ but is a valuable protective layer in the _____

troposphere; stratosphere - we live in the troposphere

Even though the concentration of air pollution has gone down over time, people in some metropolitan areas still breath are that contain unhealthy levels of pollutants.

true