CHEMISTRY MIDDLE SCHOOL

What only happens during a chemical reaction? A.
Colors change.

B.
New substances are formed.

C.
Bubbles form.

D.
A solution is made.

Answers

Answer 1
Answer: D. is the right answer.
When you mix two things, color doesn't necessarily change.
Substances are not always formed.
Gas may not always be a product of your reaction.

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The coefficients in a balanced chemical equation represent(l ) the mass ratios of the substances in the reaction (2) the mole ratios of the substances in the reaction (3) the total number of electrons in the reaction (4) the total number of elements in the reaction

Easy Question! Chemistry - Please help! I give thanks - It's the picture - Question 4

Answers

The key to answering this question is to realize that you have two polyhedrons combined to form one thus the overall volume would be equal to the sum of the two polyhedron.

Total volume= (volume of prism) + (volume of cuboid)

a) Volume of cuboid (V_(1))= l * w * h
      l   = 13ft
      w = 18ft
      h =  21ft
: . V_(1) = 13ft * 18 ft * 21ft
                              = 4914ft ^(3)

b) Volume of Prism (V_(2)) =  (1)/(2) * b * h * H
      b  = 18ft
      h  = 16ft
      H = 13ft
: . V_(2)= (1)/(2) * 18ft * 16ft * 13ft
                              = 1872ft^(3)

Thus Overall Volume = 6786ft^(3)
    

Help me!!! Several small craters lie in the floor and on the walls of crater 2. Which is older,crater 2 or the smaller craters inside it?

Answers

Well, think of it this way. If you put a big paper circle on the ground, and then you put smaller circles on top of the big circle, which one would have been there longer? The big circle, of course. So the same logic applies here: if the smaller craters had been older than the big crater, then when the big crater was formed, the smaller ones would've been buried. Therefore, crater 2 is older than the smaller craters inside it.
Hope that helped! =)

Why is radon gas hazardous?

Answers

Answer:

Usually lung cancer.

Explanation:

It causes cells in your lungs to be damaged, which can lead to lung cancer.

Usual symptoms include

persistent cough

coughing up blood

wheezing

shortness of breath

hoarseness

chest pain, especially when you cough or laugh

frequent infections such as bronchitis and pneumonia

Radon is part of the environment and generally isn’t harmful. But long-term exposure to high levels of radon can put you at risk of developing lung cancer, especially if you smoke

How do scientist communicate the results of an investigation?​

Answers

Answer:

scientists often communicate their research results in three general ways:

1) One is to publish their results in peer-reviewed journals that can be ready by other scientists.

2) Two is to present their results at national and international conferences where other scientists can listen to presentations

Explanation:

Answer:money

Explanation:

How many carbon dioxide molecules are needed to produce 5 glucose molecules?

Answers

For each molecule of glucose produced: 6 water water molecules are oxidized, and become the source of electrons for carbon dioxide reduction. 6 molecules of carbon dioxide are required, one for each carbon atom in glucose. 6 molecules of oxygen are produced as a by product of water oxidation.

To make salt water a heterogeneous mixture, you would have toA) add sand.
B) add a small amount of sugar.
C) boil the water.
D) remove the salt.

Answers

Ans A) add sand
because sand is insoluble, it will make the solution heterogeneous

Answer:

A. Add sand

Explanation:

A mixture in which particles are not uniformly distributed throughout the solution then it is known as a heterogeneous mixture.For example, sand in water is a heterogeneous mixture.Where as a mixture in which particles are evenly distributed throughout the solution then it is known as a homogeneous solution.For example, salt in water is a homogeneous solution. This, is why we can conclude that to make salt water a heterogeneous mixture, you would have to add sand.

Hopefully this answers your question.
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