2 years ago

Why were gold and copper the first forms of matter investigated by humans

Chemistry

1 answer:

baherus [9]2 years ago

8 0

They were valuable to the eyes of man then.

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As a scuba diver descends under water, the pressure increases. At a total air pressure of 2.71 atm and a temperature of 25.0 C,

Semenov [28]

Answer:

$1.32\times 10^{-3} mol/L$ is the solubility of nitrogen gas in a diver's blood.

Explanation:

Henry's law states that the amount of gas dissolved or molar solubility of gas is directly proportional to the partial pressure of the liquid.

To calculate the molar solubility, we use the equation given by Henry's law, which is:

$C_{N_2}=K_H\times p_{liquid}$

where,

$K_H$ = Henry's constant = $6.26 \times 10^{-4}mol/L.atm$

$p_{N_2}$ = partial pressure of nitrogen

$p_{N_2}= P\times \chi_{N_2}$ (Raoult's law)

$=2.71 atm\times 0.78=2.1138 atm$

$C_{N_2}=6.26 \times 10^{-4}mol/L.atm\times 2.1138 atm$

$C_{N_2}=1.32\times 10^{-3} mol/L$

$1.32\times 10^{-3} mol/L$ is the solubility of nitrogen gas in a diver's blood.

3 0

3 years ago

HELP ME IK YOU GUYS ARE HELLA SMART

Bad White [126]

Answer:

1.200g

Explanation:

At the top it's 0 and that scale goes by 10s

The middle scale is 1 and it goes by 1s

The bottom scale is .2 and it goes by .1s

1+.2= 1.2 the extra zeroes are just place holders

1.200g

5 0

2 years ago

You are given 100 g of a compound. The compound is composed of 37% hydrogen and 63% oxygen. How many grams of hydrogen are prese

Reil [10]

B is the best answer

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2 years ago

A mole is known by what other name?

Margarita [4]

Answer: avogadros number/constant

Explanation:

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1 year ago

Identify the type of chemical bond that forms when potassium reacts with bromine to form a salt.

Sunny_sXe [5.5K]

2K + Br2 ===> 2KBr

It's very ionic. The transfer of 2 electrons from K to Br2 is nearly as complete as it can be.

3 0

3 years ago