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nikitadnepr [17]
3 years ago
13

Which of the following accurately pairs the part of an atom to its charge? A. Electron—no charge B. Proton—no charge C. Neutron—

positive charge D. Electron—negative charge
Chemistry
1 answer:
Aneli [31]3 years ago
7 0

Answer:

D: Electron - Negative Charge

Explanation:

Protons have a positive charge, (pro = +)

Neutrons have a negative charge,  (neutral = 0

Electrons have a negative charge.

An element is determent by the number of protons in the atom, the Isotope of an element is determined by the number of neutrons, and the charge of an atom is determined by its electrons, which is equal to the number of protons.

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The layering of rock horizontally is for the __________ only.
Helga [31]

Answer:

A

Explanation:

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How can we separate a homogenous mixture (a solution)? For example, how can we separate salt that has been dissolved in water?
Misha Larkins [42]

Answer:

Well, to separate salt from water, you would stir the two together to create a homogenous mixture. Then you would boil the mixture; all the water would evaporate, leaving behind the salt

Explanation:

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How many moles of chloride ions are in 0.2550 g of aluminum chloride using AlCl3 's molar mass of 133.34 g / mol:?
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I got 0.001912 using dimensional analysis. See the picture for work.

7 0
3 years ago
Read 2 more answers
Mass in grams of 6.023×1023 atom of Ca​
Mademuasel [1]

Answer:

\boxed {\boxed {\sf 40.08 \ grams}}

Explanation:

First, find the molar mass of calcium (Ca). This can be found on the Periodic Table.

  • 40.08 g/mol

Next, find the number of moles.

Avogadro's Number tells us the number of atoms in one mole.

  • It is 6.023*10²³

Therefore, there are 6.023*10²³ atoms in 1 mole.

We have 6.023*10²³ atoms of calcium, so it must also be 1 mole of calcium.

Finally, find the mass. Set up a proportion using the molar mass of calcium.

1 \ mol \ Ca * \frac{40.09 \ g}{1 \ mol \ Ca}

Multiply. The moles (mol Ca) will cancel.

1 * 40.08 \ g

40.08 \ g

There are <u>40.08 grams </u>in 6.023*10²³ atoms of calcium.

5 0
3 years ago
Calculate the mass of NaOH required to make 0.40 L of a 0.50 M solution
Murljashka [212]

Answer:

8 gm

Explanation:

NaOH molar weight = 22.989   + 15.999 + 1.008 = 39.996 gm

.5 M would contain 1/2 of this per liter = 19.998 gm

now you only want 400/1000 of a liter =   7.9992 gm ~ 8gm

5 0
3 years ago
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