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stiks02 [169]
2 years ago
15

I need help ASAP!!! I need to know the model and the person who discovered it please!

Chemistry
2 answers:
QveST [7]2 years ago
6 0

Answer:

its actually the first modern atomic theory and it was created by john dalton in 1808.

Explanation:

brainliest?

Crank2 years ago
4 0

Answer:

i think electron cloud model

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Analyze the role coefficients in a chemical reaction play in stoichiometry
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Answer:

This is known as the coefficient factor

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2 years ago
Is hardness physical or chemical property
Afina-wow [57]

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The properties of the Hardness are:

Hardness is a physical property

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Diamond can scratch quartz Explanation:

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Please help!
ANEK [815]

Answer:

A- Physical, B- Chemical, C- chemical, D- Physical

Explanation:

A is physical because you can see it changing its form is changing.

B is Chemical because a new substance is formed creating the orange color of rust.

C is a Chemical reaction because it is being broken down so the banana itself is changing not just how we see it.

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2 years ago
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What is a total ionic equation ?!
vodomira [7]
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5 0
3 years ago
Look at this balanced chemical reaction: N2 + 3H2 2NH3
stepladder [879]

Answer: A mass of 124457.96 g ammonia is produced by reacting a 450 L sample of nitrogen gas at a temperature of 450 K and a pressure of 300 atm.

Explanation:

Given: Volume = 450 L

Temperature = 450 K

Pressure = 300 atm

Using ideal gas equation, moles of nitrogen are calculated as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = tempertaure

Substitute values into the above formula as follows.

PV = nRT\\300 atm \times 450 L = n \times 0.0821 L atm/mol K \times 450 K\\n = \frac{135000}{36.945}\\= 3654.08 mol

According to the given equation, 1 mole of nitrogen forms 2 moles of ammonia. So, moles of ammonia formed by 3654.08 moles of nitrogen is as follows.

2 \times 3654.08 mol\\= 7308.16 mol

As moles is the mass of substance divided by its molar mass. So, mass of ammonia (molar mass = 17.03 g/mol) is as follows.

Moles = \frac{mass}{molar mass}\\7308.16 = \frac{mass}{17.03 g/mol}\\mass = 124457.96 g

Thus, we can conclude that a mass of 124457.96 g ammonia is produced by reacting a 450 L sample of nitrogen gas at a temperature of 450 K and a pressure of 300 atm.

8 0
3 years ago
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