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4 years ago

Which statement about the orinoco river is true.

Chemistry

1 answer:

WITCHER [35]4 years ago

3 0

Hello,

I think the answer is B) It is second longest river in south america

Hope this helps!!

~Girlygir101~

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All atomic nuclei, except those of ordinary hydrogen, contain neutrons. <br> a. True<br> b. False

ozzi

This would be false

4 0

3 years ago

Read 2 more answers

Which of the following elements has the greatest ionization energy

Elanso [62]

Answer:

k(potassium) has the greatest ionization energy

3 0

3 years ago

3H2 + N2 —> 2NH3 .

In-s [12.5K]

Answer:

$\boxed{1.26 \times 10^{20} \text{ molecules NH}_{3}}$

Explanation:

We will need a balanced chemical equation with masses, moles, and molar masses.

1. Gather all the information in one place:

M_r: 2.016 17.03

3H₂ + N₂ ⟶ 2NH₃

m/g: 6.33 × 10⁻⁴

2. Calculate the moles of H₂

$\text{Moles of H}_{2} = 6.33 \times 10^{-4}\text{ g H}_{2} \times \dfrac{\text{1 mol H}_{2}}{\text{2.016 g H}_{2}} = 3.140 \times 10^{-4} \text{ mol H}_{2}$

3. Calculate the moles of NH₃

The molar ratio is 2 mol NH₃/3 mol H₂.

$\text{Moles of NH}_{3} = 3.140 \times 10^{-4} \text{ mol H}_{2} \times \dfrac{\text{2 mol NH}_{3}}{\text{3 mol H}_{2}} = 2.093 \times 10^{-4}\text{ mol NH}_{3}$

4. Calculate the molecules of NH₃

There are 6.022 × 10²³ molecules of NH₃/1 mol NH₃.

$\text{Molecules of NH}_{3} = 2.093 \times 10^{-4}\text{ mol NH}_{3} \times \dfrac{6.022 \times 10^{23}\text{ molecules NH}_{3}}{\text{1 mol NH}_{3}}\\= 1.26 \times 10^{20}\text{ molecules NH}_{3}\\\text{The reaction produces } \boxed{\mathbf{1.26 \times 10^{20}} \textbf{ molecules NH}_{3}}$

3 0

3 years ago

Objects placed together eventually reach the same temperature. when you go into a room and touch a piece of metal in that room,

Naily [24]

Answer:

1. The plastic is poor conductor of electricity

Explanation:

Indeed when two objects are placed in a room, there'll be flow of energy between the objects and the air in the room until all of them are at the same temperature. So when a person touches a metal that has been sitting in a room and it feels colder than a plastic bag at the same temperature because the moment he touches the metal, which is a good conductor of heat, it immediately starts conducting heat away from his hand leaving his hand with the sensation of "coldness". However when you touch a plastic, a poor conductor, it does not feel as cold because it is conducting very little heat from the hand.

4 0

3 years ago

If a student's unknown is a white solid and its density was calculated to be about 1.7 g/mL, it is most likely _______. A. water

Triss [41]

Answer:

The answer to your question is letter B. Phosphoric acid

Explanation:

A. water is not the right answer because it has a density of 1 g/ml and water is a liquid not a solid.

B. phosphoric acid is the right answer because phosphoric acid is a solid and all solids have a density higher than water (1 g/ml)

C. sodium hydroxide could be the correct answer but it is not because the crystals of sodium hydroxide are more colorless than white.

5 0

3 years ago