CHEMISTRY MIDDLE SCHOOL

There are many sources of air pollution in the united states and around the world. Some are natural sources, and other come from human activities. Which of these examples is a natural source of air pollution?A.) car exhaust fumes
B.) methane gas from cow manure
C.) dust from fertilizers used on crops
D.) smoke from the burning of fossil fuels

Answers

Answer 1
Answer: B should be your best guess

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Refer to the figure showing a pedigree of a family affected by an x-linked recessive disorder. A female in generation 3 isn't a carrier of the disorder. How can this be?A. Females receive X chromosomes from this fathers only, which are unaffected in this case.B. Females don't have X chromosomes so aren't affected by gene disorders passed on the X chromosome.C. Females receive an X chromosomes from each point parent, but in cases of recessive disorders, the muted chromosome isn't passed on to daughters.D. Females receive an X chromosome from each parent. If a mother is a carrier of an X-linked recessive disorder, her daughters have 50 percent chance of receiving her normal X chromosome and a 50 percent chance of receiving her mutated X chromosome.
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if a gas occupies at 5.40 L at a pressure of 1.25atm, what will be its volume at a pressure of 3.00 atm? (Show work)

Answers

Answer:

Explanation:

Givens

P = 1.25 atm

V = 5.4 L

P1 = 3 atm

V1 = ??

Formula

The basic formula is P*V = P1 * V1

Solution

1.25 * 5.4 = 3 * V1

6.75 = 3*V1

6.75 /3 = 3*V1/3

2.25 = V1

How many grams of CO2 are in 2.1 mol of the compound?a. 21.0 g
b. 44.0 g
c. 66.0 g
d. 92.4 g

Answers

Molar mass CO₂ = 44.0 g/mol

1 mole ------- 44.0 g
2.1 mole ----- > ?

g = 44.0 * 2.1 / 1

g = 92.4 / 1

= 92.4 g

answer d

hope this helps!

Model of the plant cell

Answers

Hey there. I did not build a model for you. Below is a picture of a Plant Cell that you could get some ideas from.

Best Of Luck,

     - Ari -

Final answer:

A plant cell is a type of cell found in green plants that is responsible for photosynthesis. It contains a cell wall, chloroplasts, and a central vacuole, which distinguish it from animal cells. Plant cells also include plastids and typically do not have lysosomes or centrosomes.

Explanation:

A plant cell is a type of cell found in green plants that is responsible for performing photosynthesis. It contains various elements that distinguish it from animal cells. Major components include:

  • Cell Wall: A rigid structure made predominantly of cellulose, which provides protection and structural solidity to the cell.
  • Chloroplasts: Organelles where photosynthesis occurs, using sunlight to convert carbon dioxide and water into glucose and oxygen.
  • Central Vacuole: A large organelle filled with water and enzymes that helps in maintaining cell turgor pressure, storage of nutrients and waste products.

Unlike animal cells, plant cells also contain plastids and do not usually have lysosomes or centrosomes.

Learn more about Plant Cell here:

brainly.com/question/33309994

#SPJ3

What is the percentage error if the experimental
value is equal to the accepted value?

Answers


If the experimental value is equal to the accepted value, the percent error is equal to 0. As the accuracy of a measurement decreases, the percent error of the measurement rises.

All forces cause motion? True or False

Answers

False

not all forces cause motion

Some forces, like gravity and friction, resist or work against movement.

have a goed day

How do catalysts affect energy of reactions

Answers

Explanation:

A catalyst lowers the activation energy of a reaction allowing them to proceed faster than they would naturally. Activation energy is the free energy that is required to be input in the reactant side to activate them to the transition state after which the reaction proceeds spontaneously to products.

An example of a catalyst is platinum, that is put in the exhaust of cars, to help convert carbon monoxide to carbon dioxide before it is emitted into the air.

Answer: they lower these activation required for the reactions to take place.

Explanation:
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