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3 years ago

When did democritus contribute to the atomic theory

Chemistry

1 answer:

zubka84 [21]3 years ago

6 0

Answer:

Around 400 B.C.E., the Greek philosopher Democritus introduced the idea of the atom as the basic building block matter.

Explanation:

Hope this helps.

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Consider a hypothetical reaction in which A and B are reactants, and C and D are products. If 26 grams of A completely reacts wi

natali 33 [55]

Answer:

The answer to your question is: 24 grams of D

Explanation:

To answer this question we need to remember the Lavoisier law of conservation of mass, which says that in a chemical reaction matter is neither created nor destroyed.

This means that the amount of matter stays the same.

Then, the reaction is

A + B ⇒ C + D

26 g 12 g 14 g x

mass

of reactants 38 g ? mass of products, but it must be

equal to the mass of products

Then 14g + x = 38

x = 38 - 14

x = 24 g of D

4 0

3 years ago

A sample of nitrogen gas has the temperature drop from 250.°c to 150.°c at constant pressure. what is the final volume if the in

Leviafan [203]

Charles law gives the relationship between temperature of gas and volume of gas.
It states that for a fixed amount of gas, temperature is directly proportional to volume of gas.
V / T = k
where V- volume , T - temperature and k - constant
$\frac{V1}{T1} = \frac{V2}{T2}$
parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation.
T1 = 250 °C + 273 = 523 K
T2 = 150 °C + 273 = 423 K
Substituting the values in the equation,

$\frac{310 mL}{523 K} = \frac{V}{423K}$
V = 251 mL
the new volume is 251 mL

6 0

4 years ago

Use the bond energy to calculate an approximate value of δh for the following reaction. Which is the more stable form of fno2?

professor190 [17]

The enthalpy of reaction or ∆H reaction is the difference between the bond energy of the reactants and the bond energy of the products.

<h3>What is ∆H reaction?</h3>

The term ∆H reaction refers to the heat that is evolved or absorbed in a chemical reaction. It is also known as the enthalpy of reaction.

The question is incoherent but I will try to answer as much as possible. Using the values of bond energy, ∆H reaction = Bond energy of reactants - bond energy of products. This will give us the enthalpy of reaction.

Learn more about bond energy: brainly.com/question/1657608

8 0

2 years ago

A. 6.07 x 10-15<br> How many significant figures are there in this equation

Harman [31]

Answer:

Explanation:

In scientific notation, the number of integers in the first part will always be the amount of significant figures.

For example,

1) 1.542505 x 10^17 =7 significant figures

1) 1.54 x 10^17 =3 significant figures

8 0

4 years ago

According to the collision theory, what happens in a collision without sufficient energy or correct orientation

ohaa [14]

Hi!

In collision theory, for a chemical reaction to occur - there must be <em>sufficient </em>energy to break down chemical bonds.

We call this the activation energy, as it's the energy needed to <em>activate </em>a chemical reaction!

Hopefully, this helps! =)

3 0

4 years ago

Read 2 more answers