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3 years ago

What must take place for copper metal to be oxidized?

1 answer:

6 0

<span>The copper would go under oxidation since it will be losing two electrons. Copper starts out with an oxidation number of zero, but in order to balance the compound of CuO with the Oxygen having an oxidation number of -2, a positive 2 is required</span>

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Tamara is studying the human digestive system in science class. A diagram similar to the one that follows appears in her text bo

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Answer:

esophagus

Explanation:

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3 years ago

If an isotope of oxygen has 8 protons, 10 neutrons, and 8 electrons, its mass number is_______.

melamori03 [73]

Answer:

mass number = 18

Explanation:

The mass number is the total amount of protons and neutrons in an atom. Therefore, if there are 8 protons and 10 neutrons, the mass number is 18 (8 + 10 = 18).

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2 years ago

A person weighs a different amount on other surfaces in space than they do on Earth because the gravitational pull of each surfa

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Answer:

A. The person weighs 56 pounds more on Mars than on the moon

Explanation:

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3 years ago

Read 2 more answers

125 ml of nitrogen gas is collected at 70.0 degrees Celsius. The pressure

dybincka [34]

Answer: Volume of the gas at STP is 22.53 L.

Explanation:

Given : Volume = 125 mL (as 1 mL = 0.001 L) = 0.125 L

Temperature = $70^{o}C = (70 + 273) K = 343 K$

Pressure = $125 kPa = 125 kPa \times \frac{0.01 atm}{1 kPa} = 1.25 atm$

According to the ideal gas equation, the volume of given nitrogen gas is calculated as follows.

PV = nRT

where,

P = pressure

V = volume

n = number of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

$1.25 atm \times V = 1 mol \times 0.0821 L atm/mol K \times 343 K\\V = \frac{1 mol \times 0.0821 L atm/mol K \times 343 K}{1.25 atm}\\= \frac{28.1603}{1.25} L\\= 22.53 L$

Hence, volume of the gas at STP is 22.53 L.

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3 years ago

Which layer contains almost 90% of the atmosphere's total mass?

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The answer is the troposphere

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3 years ago