What do I do if I like someone but they think your annoying

Chemistry

1 answer:

Mrrafil [7]2 years ago

3 0

Answer:

Say sorry, and then send them a gift.

Explanation:

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Uranium is a metallic element that is used in nuclear reactors and nuclear weapons. the vast majority of uranium found on earth

katrin [286]

There will be 143 neutrons in uranium-235

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3 years ago

Which of the data sets qualitative data?

Kaylis [27]

Answer:

Uh, the second one?

Explanation:

Try to restate the question please.

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2 years ago

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Please help I will mark brainy

Artyom0805 [142]

Answer:

the answer is c I took the test

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2 years ago

Which of the following is true regarding the law of conservation of mass

Luda [366]

These are the answer options of this question and the comments about their validity:

A) It dictates that the number of molecules on each side of a chemical equation must be the same.

False: the number of molecules can change. Take this simple reaction for example:

2H2(g) + O2 -> 2H2O

You start with 3 molecules, 2 molecules of H2 and 1 molecule of O2, and end with 2 molecules of water. Then the number of molecules of each side is different.

B) It dictates that the number of atoms of each element must be the same on both sides of a chemical equation.

TRUE: in a chemical reaction the atoms remain being the same at start and at the end of the process. Given that each atom has a characteristic mass, their conservation implies the law of conservation mass.

C) It states that the mass of the reactants must remain constant in order for a chemical reaction to proceed.

FALSE. The mass of the reactants changes during a chemical reaction, while they transform into the products.

D) It does not apply to chemical reactions.

FALSE: It is an important law used in the calculus related with chemical reactions.

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2 years ago

What is the molarity of a solution in which 250 grams of NaCl are dissolved in 2.9 L of water?

Maksim231197 [3]

Answer:

About 1.48 M.

Explanation:

The formula for molarity is mol/L.

So firstly, you must find the amount of moles in 250 grams of NaCl.

I do this by using stoichiometry. First, I find how nany grams are in a single mole of NaCl. This is around 58.44 grams/mole. Now that I know this, I can now use a stoich table. (250 g NaCl * 1 mol NaCl / 58.44 g NaCl). I plug this into my calculator.

I get that 250 grams of NaCl is equal to about 4.28 moles.

Now I just plug into the formula!

4.28 moles/2.9 L = about 1.48

I've attached a picture of my personal notes below which shows work I have done in similar equations.

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1 year ago