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vlada-n [284]
3 years ago
9

An electron has _____.

Chemistry
1 answer:
irina [24]3 years ago
7 0

Answer:

An electron has more mass than a proton or a neutron.

Explanation:

Mass of electron - 9.109 e-31 kg

hope it helps!!

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Contrast the chemical reactivity of potassium lithium and sodium
Colt1911 [192]
Answer is: lithium is the least reactive and potassium is the most reactive of the three alkali elements. 
<span>The </span>reactivity<span> of the alkali metals increases down the group because one valence electron (I group of Periodic system of elements) is farther away from nucleus and attraction force between electron and proton is weaker.</span>
4 0
3 years ago
What volume (in mL) of 0.250 M HCI would be
Nitella [24]

Answer: 1820 mL (to 3 sf)

Explanation:

The atomic mass of aluminum is 26.9815385 g/mol, so 4.10 g of aluminum is equal to 4.10/26.9815385 = 0.15195575300497 moles of Al.

From the coefficients of the equation, we know that for every 2 moles of aluminum consumed, 6 moles of HCl are consumed.

So, this means we need 0.15195575300497(6/2) = 0.45586725901491 moles of HCl.

Substituting into the molarity formula,

  • 0.250 = 0.45586725901491/(liters of HCl)
  • liters of HCl = 0.45586725901491/0.250
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4 0
2 years ago
When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 15.6 g of carbon were burned in the presence of
NeX [460]

Answer: 5.72 g mass of carbon dioxide was produced

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C+O_2\rightarrow CO_2

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Mass of O_2 reacted = 59.1 g - 17.5 g = 41.6 g

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=Moles of CO_2 × molar mass ofCO_2 = 1.3 ×44 g/mol =

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5.72 g mass of carbon dioxide was produced

7 0
3 years ago
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They are colourless solids (salts) that do not conduct electricity when solid, but conduct electricity in aqueous solution as the ions (that carry charge) are free to move.

They have a high melting point due to the strong electrostatic forces of attraction between oppositely charged ions

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3 0
3 years ago
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Which of the following is not a property of a gas ?
Umnica [9.8K]
The answer to your question is C
6 0
3 years ago
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