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1 year ago

True or False

Chemistry

1 answer:

horsena [70]1 year ago

6 0

1. False, 2. True, 3. True, 4. False, 5. True, 6. False, 7. True, 8. False, 9. Incomplete and 10. True.

1. Atoms have no weight - False

Atomic mass is the total mass of an atom. This is roughly equal to the total number of protons and neutrons with a small addition of electrons.

2. The electron is the heaviest part of the atom - in fact

3. All protons have the same mass - True

4. All atoms have the same mass - False

The mass of each element depends on the number of protons and neutrons it contains.

5. All neutrons have the same mass. - True

6. An oxygen atom weighs as much as a nitrogen atom. - False

o2 has a molecular weight of 15.9994 g/mol, and the molar mass of nitrogen is 14.0067 g/mol.

7. All oxygen atoms have the same mass - True

8. If we add neutrons and electrons to find the mass of an atom, the atomic mass of calcium is 40.08 - False

The number of protons and neutrons in an element determines its mass number. Protons and neutrons are the mass numbers.

9. The circular mass is 41, which is not quite correct.

10. Isotopes are identical atoms with differing numbers of protons. - True

Learn more about the atoms at

brainly.com/question/28577022?referrer=searchResults

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Calculate the mass in grams of each sample.<br><br> 4.68×1020 H2O2 molecules

oksian1 [2.3K]

24= y2k* - 2x H202 grams in mass

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3 years ago

69g of sodium reacts with chlorine to produce sodium chloride. calculate the number of moles of chlorine required to react with

Rus_ich [418]

Answer:

3 moles of $Cl^{-}$ is needed for $Na^{+}$ to be fully consumed.

Explanation:

For the balanced equation:

$Na^{+} + Cl^{-}$ ⇒ $NaCl$

First, find the moles of Na corresponding to the 69g used the general definition of mol:

$mol Na^{+} = \frac{69 g}{23 g/mol } = 3mol$

We observe that the equation is balanced and the stoichiometric ratio between them is 1: 1.

According to this, one mole of Na will react with one mole of Cl.

3 moles of $Cl^{-}$ is needed for $Na^{+}$ to be fully consumed.

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3 years ago

Where are people exposed to chemicals?

nordsb [41]

Answer:

I believe the correct answer is D.

Explanation:

You are breathing in dinitrogen and dioxygen. You exhale dinitrogen and carbon dioxide. And the atmosphere contains traces of other gases. You drink water. You have a wash with water, and soap. You eat carbohydrates and proteins. You ride to work on a vehicle powered by hydrocarbons, which spits out carbon dioxide exhaust fumes, and also some nitrogen oxides. And so your exposure to chemicals is pervasive, and unavoidable.

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3 years ago

Why+is+it+that+nitrogen+is+often+a+limiting+plant+nutrient,+despite+the+fact+that+the+atmosphere+is+80%+nitrogen+gas+(n2)?

Nataly [62]

Why is it that nitrogen is often a limiting plant nutrient, despite the fact that the atmosphere is 80% nitrogen gas because plant can not fix nitrogen.

What is nitrogen fixation?

Nitrogen fixation is a chemical process that converts molecular nitrogen (N2) in the air, which has a strong triple covalent bond, into ammonia (NH3) or related nitrogenous chemicals.

With the exception of a few microbes, atmospheric nitrogen is molecular dinitrogen, a largely nonreactive chemical. Diazotrophy, or biological nitrogen fixation, is an important microbially driven process that transforms dinitrogen (N2) gas to ammonia (NH3) via the nitrogenase protein complex.

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1 year ago

What is the mass number of a carbon atom that contains 6 protons 8 neutrons 6 electrons?

zimovet [89]

Mass no. = Protons + Neutrons
Mass no.= 6 + 8
= 14

If you look at the periodic table, you will see that the carbon atom has a mass number of 12. But if you compare with this carbon, it is 14. This is because this carbon atom is an isotope. The isotope is called carbon-14.

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3 years ago