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2 years ago

What has caused air quality in United States to improve/get better since the 1950s?

Chemistry

2 answers:

weeeeeb [17]2 years ago

8 0

Answer:

better mileage on cars, took lead out of paint, smaller packaging like for delivery and store products, EPA laws updating

stealth61 [152]2 years ago

8 0

Answer:

Reducing pollution from transportation sources has led to healthier air for Americans. In cities, smog has been visibly reduced.

Explanation:

i hope this helped

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Calculate the mass in grams of a single atom C¹²

WARRIOR [948]

Answer: c12 has a mass of 12 amu

Explanation:

mass of one mole of c12 = g. So mass of 1 atom of c12 = 1.9927e-23g

7 0

2 years ago

Read 2 more answers

A sample of Freon-12 (CF2Cl2) occupies 2.842 x 101 L at 331 K and 2.525 x 102 kPa. Find its volume (in L) at standard temperatur

Angelina_Jolie [31]

We have to first find the number of moles of Freon-12 in the sample using the ideal gas law equation
PV = nRT
n = $\frac{PV}{RT}$
since the number of moles at both conditions given and at stp we can write the following formula
$\frac{P1V1}{RT1} = \frac{P2V2}{RT2}$
where parameters for the given conditions are on the left side and parameters for STP conditions are on the right side of the equation
where P1 - pressure - 252.5 kPa
V1 - volume - 28.42 x 10⁻³ m³
R - universal gas constant
T1 - 331 K

STP conditions
P2 - 101 325 Pa
T2 - 273 K

substituting these values in the equation

$\frac{252 500Pa*28.42*10 ^{-3}m^{3} }{R*331K} = \frac{101325 Pa*V}{R*273 K}$

V = 58.41 L
Volume at STP is 58.41 L

3 0

2 years ago

What kind of bonding is found in Fe2O3?

Natasha2012 [34]

Answer:

Ionic

Explanation:

Any metal with a nonmetal is an ionic bond due to the transfer of electrons from one element to another.

5 0

3 years ago

E. Top soil is fertile reason

Lady_Fox [76]

Answer:

Hello

Topsoil consists of most weathered mineral and organic material. Biological agents are also responsible for the breakdown of complex organic matter which releases simple nutrients. This process of mineralisation make soil fertile.

Explanation:

4 0

2 years ago

How much potassium chloride, KCI, is produced during the decomposition of 100.0 grams of potassium chlorate KCIO3? Please show s

Ne4ueva [31]

Answer: the reaction will produce 15.3 g of
KCl.

explanation:
1. write the balanced equation.
2KClO
3
→
2KCl
+
3O
2

2. calculate the moles of
KClO
3
.
Moles of KClO
3
=
25.0
g KClO
3
×
1 mol KClO
3
122.55
g KClO
3
=
0.2046 mol KClO
3

3. calculate the moles of
KCl
.
Moles of KCl
=
0.2046
mol KClO
3
×
2 mol KCl
2
mol KClO
3
=
0.2046 mol KCl

4. calculate the mass of
KCl
.
Mass of KCl
=
0.2046
mol KCl
×
74.55 g KCl
1
mol KCl
=
15.3 g KCl

4 0

3 years ago

What has caused air quality in United States to improve/get better since the 1950s?￼

What has caused air quality in United States to improve/get better since the 1950s?