CHEMISTRY HIGH SCHOOL

Which substance is a molecule?A. water
B. sodium
C. salt water
D. sand and salt

Answers

Answer 1
Answer: The answer would be salt Water hope I helped you
Answer 2
Answer: The answer is water :D

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If one body is positively charged and another body is negatively charged, free electrons tend to A. move from the negatively charged body to the positively charged body. B. remain in the negatively charged body. C. move from the positively charged body to the negatively charged body. D. remain in the positively charged body.

Suppose you are asked to find the area of a rectangle that is 2.1-cm wide by 5.6-cm long. Your calculator answer would be 11.76 cm2 . Now suppose you are asked to enter the answer to two significant figures. (Note that if you do not round your answer to two significant figures, your answer will fall outside of the grading tolerance and be graded as incorrect.)

Answers

1) ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are ALWAYS significant.2) ALL zeroes between non-zero numbers are ALWAYS significant.3) ALL zeroes which are SIMULTANEOUSLY to the right of the decimal point AND at the end of the number are ALWAYS significant.4) ALL zeroes which are to the left of a written decimal point and are in a number >= 10 are ALWAYS significant.

so it will be 11.76 = 12 bc 7 rounds up

If a measurement is recorded as 1.2 cm, what is the smallest marking on the instrument?

Answers

The smallest marking would be 1/10th of a centimeter

For the reaction:6Li(s)+N2(g)→2Li3N(s)
Determine:
the mass of N2 needed to react with 0.536 moles of Li.
the number of moles of Li required to make 46.4 g of Li3N.
the mass in grams of Li3N produced from 3.65 g Li.
the number of moles of lithium needed to react with 7.00 grams of N2.

Answers

Explanation:

6Li(s)+N_2(g)\rightarrow 2Li_3N(s)

1. Mass of N_2 needed to react with 0.536 moles of Li.

According to reaction, 6 moles of Li reacts with 1 mol of N_2.

Then 0.536 moles of Li will react with:

(1)/(6)* 0.536 moles of N_2 that is 0.0893 moles.

Mass of N_2[tex] gas needed:</strong></p><p><strong>[tex]=28 g/mol* 0.0893 mol=2.5004 g

2.The number of moles of Li required to make 46.4 g of Li_3N

Moles of Li_3N=(46.4 g)/(35 g/mol)=1.3257 mol

According to reaction the 2 moles of Li_3N are produced from 6 moles of Li.

Then 1.3257 moles of Li_3N will produced from:

(6)/(2)* 1.3257=3.9771 moles

3.9771 moles of lithium will needed.

3. The mass in grams of Li_3N produced from 3.65 g Li.

Moles of Li =(3.65 g)/(7 g/mol)=0.5214 moles

According to reaction, 6 moles of Li gives 2 moles of Li_3N

Then 0.5214 moles of Li will give (2)/(6)* 0.5214 that is 0.1738 moles of Li_3N.

Mass ofLi_3N=0.1738 mole* 35 g/mol=6.083 g

6.083 grams of Li_3N will be produced.

4. The number of moles of lithium needed to react with 7.00 grams of N_2.

Moles of N_2=(7.00 g)/(28 g/mol)=0.25 moles

1 mol of N_2 reacts with 6 mol of Li

Then, 0.25 moles of N_2 will ftreact with :

6* 0.25 moles=1.5 moles of lithium

1.5 moles of Li will be needed.

Remember it!Determine the statement that accurately explains the
endothermic and exothermic reactions.
4
O Endothermic reactions absorb heat
energy while exothermic reactions
release heat energy.
O Exothermic reactions absorb heat
energy while endothermic reactions
release heat energy.
O Endothermic and exothermic reactions
absorb thermal energy.
O Endothermic and exothermic reactions
release thermal energy.
REM
The prefix exo-
applied to a che
mean energy
re

Answers

Statement-1 is the correct answer that is Endothermic reactions absorb heat energy while exothermic reactions release heat energy.

How can we distinguish between exothermic and endothermic processes?

Chemical reactions that release energy are referred to as exothermic. More energy is produced than is needed to break the bonds between the reactants when bonds are formed in the byproducts of exothermic processes.

Chemical processes that either use or absorb energy are referred to as endothermic. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products. Since an isothermic chemical reaction uses exactly as much energy as it produces, there is no net energy change.

Therefore, the first statement is the right response.

To know more about exothermic, check out:

brainly.com/question/2924714

#SPJ1

Heelp plsWhich element has the lowest electronegativity?
nitrogen (N)
lithium (Li)
bromine (Br)
potassium (K)

Answers

Answer: Potassium (K) has the lowest electronegativity among the given elements.

Explanation:

Electronegativity is a measure of an element's ability to attract electrons towards itself when it is involved in a chemical bond with another element. Potassium has the lowest electronegativity because it has only one valence electron that is located far from the nucleus, making it easier to lose that electron and become a positively charged ion. In contrast, nitrogen, lithium, and bromine have higher electronegativities because they have more valence electrons or the valence electrons are closer to the nucleus, making it more difficult to remove or share electrons.

The element with the lowest electronegativity among the given options is potassium (K). Potassium has an electronegativity value of approximately 0.82 on the Pauling scale, which is the lowest value among the four elements listed. In contrast, nitrogen (N) has an electronegativity of approximately 3.04, bromine (Br) has an electronegativity of approximately 2.96, and lithium (Li) has an electronegativity of approximately 0.98. Electronegativity is a measure of an atom's ability to attract electrons towards itself in a chemical bond. The lower the electronegativity value, the less the atom attracts electrons towards itself.

Brainliest?

As carbon dioxide sublimes, its entropy
(1) decreases (2) increases (3) remains the same

Answers

Answer: (2) increases

Explanation: Entropy is the measure of randomness or disorder of a system. More is the random arrangement of molecules in a system , more is the entropy of the system. More ordered is the arrangement of molecules in a system, less is the entropy of the system.

When carbon dioxide sublimes, it means solid carbon dioxide is directly changing to gaseous state without undergoing into liquid state, thus the molecules will be more random and thus the entropy will increase.
When something sublimes (Goes straight from solid to gas), it takes in energy, as it is an endothermic process, so its entropy increases
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