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3 years ago

H2 H2O H2O2 CH4 All four examples represent

Chemistry

2 answers:

miv72 [106K]3 years ago

8 0

It is covalent bonds

satela [25.4K]3 years ago

7 0

Answer: molecules

Justification:

1) Given formulas: H₂, H₂O, H₂O₂, CH₄.

2) A molecule is the chemical combination of two or more atoms through covalent bonds.

3) Non-metals only can bond among them by covalent bond, i.e. by sharing electrons.

Two nonmetals cannot bond to each other in other way (ionic bonds) because any of them will not be willing to release an electron completely.

Since the two nonmetal elements just need a few more electrons to complete their respective valence electron shell, they will do it by sharing electrons instead of releasing them.

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mylen [45]

Answer: hello attached below is the complete question

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5 0

2 years ago

A 10g vial must have 45ml of diluent added to it. it has a powder volume of 5ml. how many mgr will be in each ml of the final so

Semenov [28]

The solution has a concentration 20 mgr in each mL of the final solution.

To solve this problem, we need to know about concentration. The concentration formula can be defined as how much the mass per unit volume is. It can be written as

M = m/V

where M is concentration, m is mass of solute, V is the total volume of solution.

From the text we know that :

m = 10g

vsolvent = 45mL

vsolute = 5 mL

find the total volume (V)

V = vsolvent + vsolute

V = 45 + 5

V = 50mL

Then, find the concentration

M = m/V

M = 10gr / 50 mL

M = 1000 mgr / 50mL

M = 20 mgr / mL

Hence, the solution has a concentration 20 mgr in each mL of the final solution.

Find more on concentration at: brainly.com/question/17206790

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6 0

2 years ago

A sample of 450.0 g of water is found to contain 180 mg Cd. What is this concentration in parts per million?

navik [9.2K]

Answer:

The correct answer is 399.8 ppm

Explanation:

A concentration in parts per million (ppm) is equal to:

$1 ppm = \frac{1 g solute}{10^{6}g solution}= \frac{1 mg solute}{1 kg solution}$

Solute: Cd; Mass = 180 mg x (1 g/1000 mg) = 0.18 g

Solvent: Water ; Mass= 450.0 g x (1 kg/1000 g) = 0.45 kg

We have the following total mass of solution:

Mass of solution = Mass of solute + Mass of solvent = 0.18 g + 450 g = 450.18 g = 0.45018 kg

Finally, we divide the <u>mass of solute (in mg)</u> into the <u>mass of solution (in kg)</u> to obtain the ppm (in mg/Kg):

ppm = 180 mg/0.45018 kg = 399.8 mg/Kg = 399.8 ppm

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3 years ago

A blue solid X is soluble in water which method is used to obtain pure solid x from an aqueous solution

netineya [11]

Answer:

The answer is crystallisation

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3 years ago

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An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.

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3 years ago

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