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sergij07 [2.7K]
4 years ago
8

is it true that all elements are made up of at least one of these elements air, fire, water and earth

Chemistry
2 answers:
Mkey [24]4 years ago
4 0

Answer:

I think it is true i hope its right

lapo4ka [179]4 years ago
3 0

Please look at the attached file.

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A fact of nature that has been confirmed many times by observation is known as a(n).
BlackZzzverrR [31]

Answer:

law(scientific law)

Explanation:

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4 years ago
2. Can oxidation occur without reduction? Explain.
Vikki [24]

Answer: Nope

Explanation:

Oxidation occurs because an agent that causes the oxidation---the oxidizing agent---must itself get reduced

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3 years ago
Nitrogen monoxide and hydrogen react to form nitrogen and water, like this: 2NO+2 H2(g)-N29)+2H2O(9) Write the pressure equilibr
lara31 [8.8K]

Answer:

Partial pressure N₂ . (Partial pressure H₂O)² / (Partial pressure H₂)² . (Partial pressure NO)² = Kp

Explanation:

The reaction is:

2NO + 2H₂ → N₂ + 2H₂O

The expression for Kp (pressure equilibrium constant) would be:

Partial pressure N₂ . (Partial pressure H₂O)² / (Partial pressure H₂)² . (Partial pressure NO)²

There is another expression for Kp, where you work with Kc (equilibrium constant)

Kp = Kc (R.T)^Δn

where R is the Ideal Gases constant

T° is absolute temperature

Δn = moles of gases formed - moles of gases, I had initially

4 0
4 years ago
The specific heat of lead is 0.0380 cal/g·°C. If 47.0 calories of energy raised the temperature of a lead sample from 28.3°C to
ollegr [7]

Answer:

Mass of lead, m = 687 g

Explanation:

The expression for the calculation of the enthalpy change of a process is shown below as:-

\Delta H=m\times C\times \Delta T

Where,  

\Delta H  is the enthalpy change

m is the mass

C is the specific heat capacity

\Delta T  is the temperature change

Thus, given that:-

Mass  = ?

Specific heat = 0.0380 cal/g°C

\Delta T=30.1-28.3\ ^0C=1.8\ ^0C

Heat added = 47.0 calories

So,  

47.0=m\times 0.0380\times 1.8

Mass of lead, m = 687 g

4 0
3 years ago
Which best describes the process that arrow 1 represents?
mafiozo [28]
Put a picture we can’t see the arrow
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