CHEMISTRY HIGH SCHOOL

Help please! How many significant figures are in the measurement 0.00440 grams?

6
5
3
2

Answers

Answer 1
Answer: 3 significant figures.

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Life is possible on earth because of suitable air water and temperatures true or false​
Atomic radiusa. increases across a period and increases down a group. b. decreases across a period but increases down a group. c. increases across a period but decreases down a group. d. decreases across a period and decreases down a group.

Which statement is part of the kinetic molecular theory? A. Gas particles are in constant motion. B. Gas particles attract each other. C. Gas particles lose their energy during collisions. D. Gas particles stick to the walls of their container.

Answers

Answer:

The answer to your question is: letter A

Explanation:

A. Gas particles are in constant motion. This statement is true because this theory says that Gases are composed of a large number of particles that behave like hard, spherical objects in a state of constant, random motion.

B. Gas particles attract each other. This statement is false because this theory says that there is no force of attraction between gas particles or between the particles and the walls of the container.

C. Gas particles lose their energy during collisions. This statement is false, this theory says that none of the energy of a gas particle is lost when it collides with another particle or with the walls of the container.

D. Gas particles stick to the walls of their container. This statement is false, the theory says that there is no force of attraction between gas particles or between the particles and the walls of the container.

A chemistry student must separate should barium sulfate from the aqueous solution. Equipment and glassware normally found in the chemistry classroom are available to the student.Describe how the student could separate the solid barium from the aqueous solution. Be sure to list the lab equipment needed to do the procedure
Explain how each item is used in the procedure
List any safety equipment needed and how it is used in the procedure
Describe how this procedure might be used in a situation outside the chemistry classroom

Answers

If there's just some barium put in an aqueous solution, then it should be something like this.
It's a mixture of a solution and an insoluble solid, so the easiest way to go is through filtration. (Also, I'm assuming the barium is cut into very small chips.)

In a line, simply filter the solution using a folded filter paper in a funnel, collect the residue in a beaker or flask, rinse it with distilled water and let it dry. (Or simply filtering it could be enough, depending on how far your teacher wants you to go.)

Stuff needed:
>filter paper (for separating the solid from the solution)
>funnel (to hold the filter paper)
>beaker or flask (to hold the filtrate)
>distilled water (to rinse the solid)
>spatula (to scoop up the solid)

Procedure:
>Fold filter paper and line the funnel with it. Place the funnel in the flask or beaker.
>Pour solution in. Then add water (I think using tap water might be fine in this case, but you can use distilled water if you'd like) to wash out the container with the solution of any solid you may have not gotten in the first try. Alternatively, you could use a spatula to spoon it onto the filter paper.
>Once everything has been filtered, pour some distilled water on the residue on the filter paper to wash away the solution.
>Take out the filter paper, open it up and let it dry.

This can be used in real life in many occasions. For example, when you make tea, you need to filter the leaves out. Or when you cook the pasta, you put it in a sieve to separate the pasta from the water. Or when you fish using fishing nets, you "filter" the fish from the water. 

Which of the following is not an acid? HCl

H2SO4

HNO3

NaOH

Answers

NaOH is not an acid. It is categorized as a base, specifically a strong base, since it has the capability to accept protons from any proton donor and, when it is in aqueous form, it fully dissociates into ions of sodium and hydroxide. 

Any substance that tastes unpleasant in water solution, turns blue litmus paper red, reacts with some metals to release hydrogen, combines with bases to create salts, and stimulates chemical processes is considered an acid. Here among the given options, NaOH is a base. The correct option is D.

Any hydrogen-containing material that has the ability to donate a proton (hydrogen ion) to another chemical is considered an acid. A base is a molecule or ion that can take up an acid's hydrogen ion. Typically, sour tastes help to identify acidic chemicals.

An acid is not NaOH. It is categorized as a base, more specifically a strong base, because it can receive protons from any proton donor and completely dissociates into sodium and hydroxide ions in an aqueous form.

Thus the correct option is D.

To know more about acid, visit;

brainly.com/question/29796621

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32 What is the overall charge of an ion that has 12 protons, 10 electrons, and 14 neutrons?(1) 2- (3) 4­
(2) 2+ (4) 4+

Answers

The charge of a proton is +1, of an electron is -1, and of a neutron is 0.

12*(+1) +10*(-1) +14*0
= 12 -10
= +2

The correct answer is (2) +2.

Hope this would help~
protons have a 1+ charge
Electrons have a 1- charge
So 12-10 is 2+

Can i get help with this dont really get it​

Answers

Answer:

Number 2 is Direction

Explanation:

The old answer for number four was incorrect

I apologize for the inconvenience but I do not have an answer that fits in the lines for number 4

A salt is dissolved in water, which has a boiling point of 100 degrees celsius. the boiling point of the solution would be?

Answers

It would be higher, due to lower vapor pressure when salt is added. If you want an exact number, we're going to need to know how much salt.
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