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Fudgin [204]
3 years ago
12

What is the mass number of an atom which contains 21 electrons, 21 protons, and 24 neutrons?

Chemistry
1 answer:
murzikaleks [220]3 years ago
7 0
45 is the atomic mass of the atom. And the name is Scandium 
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How many grams of water will form if 10.54 g H2 react with 95.10 g O2?
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Answer:

94.0

Explanation:

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Which type of radiation involves the conversion of a neutron into a proton?
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B. Beta

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2 years ago
When jogging outside you accidently bump into a curb. Your feet stop but your body continues to move forward and you end up on t
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Answer:

Newton's First Law of Motion

Explanation:

Newton’s first law of motion is when an object can’t move or change their speed without some type of force. Inertia is included since is caused by unbalanced force.

4 0
3 years ago
Phosphorus p4 burns in oxygen to form diphosphorus pentoxide what is the balanced chemical equation representing this chemical r
ahrayia [7]

Answer:

P₄ + 5O₂ → 2P₂O₅

Explanation:

Phosphorus burn in the presence of air and produced diphosphorus pentoxide.

Chemical equation:

P₄ + O₂ → P₂O₅

Balanced chemical equation:

P₄ + 5O₂ → 2P₂O₅

Equation is balanced because there are four phosphorus atoms ans ten oxygen atoms in both side of equation.

Coefficient with reactant and product:

P₄         1

O₂        5

P₂O₅    2

7 0
3 years ago
Carlos is making phosphorus trichloride using the equation below.
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Answer:

C.) 2

Explanation:

Chemical equations, in a way, can be seen as algebraic equations. Cl2 is a molecular structure, so, there are two Cl atoms. 3Cl2 means 3, Cl2 molecules. So, if we think of it as adding up all the atoms, we will get, 2 P atoms and 6 Cl atoms. Now to convert. The Law of the Conservation of Mass basically says you can't add or subtract atoms out of nowhere, so the number of atoms has to stay the same when it's being converted. We need to place a coefficient with PCl3. If we look at PCl3, it shows us that there are three Cl atoms and one P atom. And looking back at how many atoms there were on the left side of the equation, we just need to double the atoms of atoms so it will be equal. So, the answer is C.) 2

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7 0
2 years ago
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