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3 years ago

2 points

Chemistry

1 answer:

Westkost [7]3 years ago

4 0

Answer:

Law of conservation of mass

Ernest Rutherford

Explanation:

The basic law of behavior of matter that states that "mass is neither created nor destroyed in a chemical reaction or physical change".

This is the law of conservation of mass. It is very essential in understanding most chemical reaction. Also, in quantitative analysis, this law is pivotal.

Ernest Rutherford was the scientist that stated that the nucleus is made up of positive charge. It was not until James Chadwick in 1932 discovered the neutron that we had an understanding of this nuclear component.

Rutherford surmised from his experiment that because most the alpha particles passed through the thin Gold foil and just a tiny fraction was deflected back, the atom is made is made up of small nucleus that is positively charged.

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On the basis of dipole moments and/or hydrogen bonding, explain in a qualitative way the differences in the boiling points of ac

Inga [223]

Go on google bro you can get more help there and hope you get what your looking for and good luck

7 0

3 years ago

In science test are sometime clled

natita [175]

Answer:

In the scientific method, an experiment is an empirical procedure that arbitrates competing models or hypotheses. Researchers also use experimentation to test existing theories or new hypotheses to support or disprove them

Explanation:

Hope this helps

4 0

3 years ago

Read 2 more answers

if 0.40 mol of h2 and .15 mol of o2 were to reat as completely as possible to produce h20, what mass of the reactant would remai

Sveta_85 [38]

Answer:

0.2g

Explanation:

Given parameters:

Number of moles of H₂ = 0.4mol

Number of moles of O₂ = 0.15mol

Unknown:

Mass of reactant that would remain = ?

Solution:

To solve this problem, we need to know the limiting reactant which is the one in short supply in the given reaction.

The expression of the reaction is :

2H₂ + O₂ → 2H₂O

2 mole of H₂ will combine with 1 mole of O₂

But given; 0.4 mole of H₂ we will require $\frac{0.4}{2}$ = 0.2mole of O₂

The given number of oxygen gas is 0.15mole and it is the limiting reactant.

Hydrogen gas is in excess;

1 mole of oxygen gas will combine with 2 mole of hydrogen gas

0.15 mole of oxygen gas will require 0.15 x 2 = 0.3mole of hydrogen gas

Now, the excess mole of hydrogen gas = 0.4 mole - 0.3 mole = 0.1mole

Mass of hydrogen gas = number of mole x molar mass

Molar mass of hydrogen gas = 2(1) = 2g/mol

Mass of hydrogen gas = 0.1 x 2 = 0.2g

8 0

2 years ago

A scientist develops a new experiment to test atomic theory. His results do not agree with the theory.

slamgirl [31]

Answer:

When the results of a new experiment to test atomic theory do not agree with the theory, scientist will repeat the experiment to make sure that his results are reliable.

Explanation:

In the scientific context, each new experiment must be performed with precision and following the steps of the scientific method.

An experiment that does not provide reliable data to demonstrate a theory must be reviewed in detail and performed again to confirm the data obtained in the first attempt.

A theory is a postulate that tries to explain a natural phenomenon, but whose argument can be discussed or does not have the acceptance of a law. When the theory is proven and there are no arguments against it, it can be universally accepted and becomes a law.

The other options are not valid due to:

Scientists worldwide will reject atomic theory because of the new results. A theory cannot be discarded without solid arguments or evidence in order to dismiss it and establish a new one.
The scientist will change his results to agree with the accepted theory. This would be an unethical procedure and unacceptable to the scientific community.
Other scientists will reject the results because they do not agree with the theory. The opinion of other scientists is not enough to dismiss a theory, if it has a valid scientific basis.

8 0

3 years ago

Read 2 more answers

Remember what the equation is:

saw5 [17]

Answer:

1; 0.83moles

2; 0.83M

3; 1.66M

4; 0.415M

Explanation:

7 0

3 years ago