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4 years ago

Which idea did john dalton include in his atomic theory

Chemistry

2 answers:

marysya [2.9K]4 years ago

8 0

Explanation:

Dalton's atomic theory is based on law of constant proportion and law of conservation of mass, which was the first to describe all matter in terms of their properties and atoms. It states that :

All matter are made up of atoms which are indestructible and indivisible.
All atoms of an element given, are identical in properties and mass.
The compounds are combination of two or more different atoms.
The chemical reaction is basically rearrangement of atoms.

Alexandra [31]4 years ago

5 0

Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.

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Percent yield is the quantity of product actually produced compared to the quantity _______.

ss7ja [257]

Answer:

Of expected product

Explanation:

6 0

3 years ago

A mass of 12.0g of carbon contains what?

tatuchka [14]

It contains one mol of carbon atoms. For the better calculating in the chemical reaction, we often use the mol as unit to describe the amount. Carbon is consists of carbon atoms. And the mol number is related to the mass of atoms. The molar mass of carbon is 12 g/mol. So the answer is 1 mol carbon atoms.

8 0

3 years ago

1. If there are 100 navy beans, 27 pinto beans and 173 blackeyed peas in a container, what is the percent abundance in the conta

kompoz [17]

The answers to the two questions are:

1. The percent abundance in the container which has 100 navy, 27 pinto, and 173 black-eyed peas beans is 33.3%, 9.0%, and 57.7% for navy bean, pinto bean, and black-eyed peas beans, respectively.

2. The weighted average score for the scores of 85, 75, 96 obtained from the evaluations of exams (20%), labs (75%), and homework (96%) is 84.1.

1. The percent abundance by type of bean is given by:

$\% = \frac{n}{n_{t}} \times 100$ (1)

Where:

n: is the number of each type of beans

$n_{t}$ : is the total number of beans

The total number of beans can be calculated by adding the number of all the types of beans:

$n_{t} = n_{n} + n_{p} + n_{b}$ (2)

Where:

$n_{n}$ : is the number of navy beans = 100

$n_{p}$ : is the number of pinto beans = 27

$n_{b}$ : is the number of black-eyed peas beans = 173

Hence, the total number of beans is (eq 2):

$n_{t} = 100 + 27 + 173 = 300$

Now, the percent abundance by type of bean is (eq 1):

Navy beans

$\%_{n} = \frac{100}{300} \times 100 = 33.3 \%$

Pinto beans

$\%_{p} = \frac{27}{300} \times 100 = 9.0 \%$

Black-eyed peas beans

$\%_{b} = \frac{173}{300} \times 100 = 57.7 \%$

Hence, the percent abundance by type of bean is 33.3%, 9.0%, and 57.7% for navy bean, pinto bean, and black-eyed peas beans, respectively.

2. The average score (S) can be calculated as follows:

$S = e*\%_{e} + l*\%_{l} + h*\%_{h}$ (3)

Where:

e: is the score for exams = 85

l: is the score for lab reports = 75

h: is the score for homework = 96

$%_{e}$ $\%_{e}$ : is the percent for exams = 70.0%

$\%_{l}$ : is the percent for lab reports = 20.0%

$\%_{h}$ : is the percent for homework = 10.0%

Then, the average score is:

$S = 85*0.70 + 75*0.20 + 96*0.10 = 84.1$

We can see that if the score for each evaluation is 100, after multiplying every evaluation for its respective percent, the final average score would be 100.

Therefore, the weighted average score will be 84.1.

Find more about percents here:

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I hope it helps you!

4 0

3 years ago

Round 0.02056 to three significant figures 0.0205 0.0206 0.021 0.020

____ [38]

In this question we are asked to round off the figure 0.02056 to three significant figures.

We are given with four options to chose best out of four

a) 0.0205

b) 0.0206

c) 0.021

d) 0.020

In this question, option (b) is correct i.e. 0.0206.

There are four significant rules, we should keep in mind during round off:

Non-zero digits are so significant

Zeros between two non-zero digits are significant

Leading zeros are not significant

Trailing zeros are important only if the number contains a decimal point

To know more about Round off:

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2 years ago

A quantum of electromagnetic energy is called

drek231 [11]

Answer:

A quantum of electromagnetic energy is called photon

Explanation:

A photon corresponds to an elementary particle that composes the light, without any internal structure that is known at the moment. Said particle carries visible, ultraviolet, infrared, X-ray, gamma and other forms of electromagnetic radiation particles. The photon can travel in a vacuum at a constant speed and lacks mass or electric charge.

5 0

4 years ago