CHEMISTRY HIGH SCHOOL

Select all that apply. A beta particle:

1.) is electromagnetic energy
2.) is an electron
3.) has zero charge
4.) is emitted from the nucleus
5.) has a +2 charge
6.)has a -1 charge

Answers

Answer 1
Answer:

Answer: 2, 4, 6

Explanation: A beta particle is a high energy electron, emitted from the radioactive disintegration of an atomic nucleus. It has a -1 charge.

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What is the percent composition by mass of nitrogen in NH4NO3 (gram-formula mass = 80.0 grams/mole)?(1) 17.5% (3) 52.5%
(2) 35.0% (4) 60.0%

Answers

Answer:

The correct option is (2) 35.0%

Explanation:

If we want to calculate the percent composition by mass of nitrogen in NH4NO3 we first need to calculate the mass of nitrogen in one mole of NH4NO3.

Because of the molecular form of NH4NO3 (it has 2 ''N'') we know that one mole of NH4NO3 contains 2 moles of N.

The molar mass of N (nitrogen) is 14.0067(g)/(mole)

This means that 1 mole of N contains 14.0067 grams of N.

Because we have 2 moles of N ⇒ (2moles).(14.0067(g)/(mole))=28.0134g

We know that in 1 mole of NH4NO3 we have 2 moles of N(28.0134 g of N).

To calculate the percent composition by mass of nitrogen we need to divide the mass of nitrogen in one mole of NH4NO3 by the mass of one mole of NH4NO3 and then multiply it by 100.

We know that in 1 mole of NH4NO3 there are 80.0 g of NH4NO3 (Because of the molar mass data) ⇒

((28.0134g)/(80.0g)).100=35.016 % ≅ 35.0%

We find that the percent composition by mass of nitrogen in NH4NO3 is 35.0%

We conclude that the correct option is (2) 35.0%
gram-formula=80.0grams/mole will be 35.0%

Which element is rolled into a foil found and used in your kitchen?

Answers

The question is asking to determine what kind of element is rolled into a a foil and used in you kitchen, and base on my own research and also in understanding the elements, I would say that the answer would be Aluminum. I hope you are satisfied with my answer and feel free to ask for more 
aluminium ........................

During carbon fixation, what type of molecules are the carbon atoms in carbon dioxide rearranged into?

Answers

Answer: Organic molecules

Explanation:

During carbon fixation, the carbon atoms in carbon dioxide are rearranged into organic molecules such as glucose through a series of enzymatic reactions.

Final answer:

In carbon fixation, carbon atoms from CO2 are rearranged into three-carbon molecules or 3-carbon organic compounds. This happens in photosynthesis' Calvin cycle, facilitated by the enzyme RuBisCO.

Explanation:

During carbon fixation, the carbon atoms in carbon dioxide are rearranged into more complex molecules known as  three-carbon molecules or 3-carbon organic compounds. This process occurs during the first stage of the Calvin cycle in photosynthesis. The enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) catalyzes the reaction between carbon dioxide (CO2) and ribulose-1,5-bisphosphate (RuBP) to create two molecules of 3-phosphoglycerate, a 3-carbon organic compound.

Learn more about Carbon Fixation:

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in a molecule of methane, carbon (having four valence electrons) binds to four hydrogen atoms. how many lone pairs of electrons will be represented in the lewis structure of methane? a. four b. two c. one d. zero

Answers

D. Each bond is a single bond. Allowing all 4 valence electrons in the carbon to be taken up by the one valence electron in the four hydrogen atoms.

What is the molarity of a solution made with 298g of potassium chloride dissolved in enough water to make 2L of solution?

Answers

The molarity of the solution made by dissolving 298 g of KCl in enough water to make 2 L of the solution is 2 M

  • We'll begin by calculating the number of mole in 298 g of potassium chloride, KCl. This can be obtained as follow:

Mass of KCl = 298 g

Molar mass of KCl = 39 + 35.5 = 74.5 g/mol

Mole of KCl =?

Mole = mass / molar mass

Mole of KCl = 298 / 74.5

Mole of KCl = 4 moles

  • Finally, we shall determine molarity of the KCl solution. This can be obtained as follow:

Mole of KCl = 4 moles

Volume = 2 L

Molarity of KCl =?

Molarity = mole / Volume

Molarity of KCl = 4 / 2

Molarity of KCl = 2 M

Therefore, the molarity of the KCl solution is 2 M.

Learn more: brainly.com/question/24256264

Answer:

2 M

Explanation:

The equation for molarity is "M = moles/liters"

Potassium chloride's atomic mass is 74.55, meaning one mole of KCl is equal to 74.55g. In the equation, 298g of KCl is being used. To find out how many moles this is, multiply 298g of KCl by (1 mol/74.55g of KCl) to get 4.0 moles. Now you can use the equation for molarity.

M = 4.0 moles/2 Liters

Based on these data, what is the value of the formation constant, Kf, of [Cu(NH3)4]2+? [Cu 2+ ]=6.47x10 -15 kf=

Answers

i dont even know to be honest
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