CHEMISTRY MIDDLE SCHOOL

A substance changes from a solid to a liquid at its boiling point. True or false

Answers

Answer 1
Answer: The answer is false
For an ex: an ice is a solid once it's melts cuz of the heat it's a liquid but if u boil the liquid then it's at it's boiling point

Idk I'm not that really good in science sorry......
Answer 2
Answer: True because if it gets to its boiling point then it would start to melt then become liquid and then will harden up over time and change back to a solid in a different form

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Which type of fermentation sometimes occurs in people

Answers

lactic acid fermentation 

How The Distance Between two celestial Bodies Impacts Their gravitational attraction

Answers

The closer they are, the greater the gravitational pull they will have on each other.  Size also affects the gravitational pull of the celestial bodies because the larger the body the greater the pull it will have.

How many liters of O2 gas will be produced at STP from 4 moles of KC1O3

Answers

Answer:

V = 134.5 L

Explanation:

Given data:

Number of moles of KClO₃ = 4 mol

Litters of oxygen produced at STP = ?

Solution:

Chemical equation:

2KClO₃  →  2KCl   + 3O₂

Now we will compare the moles of KClO₃ with oxygen.

                    KClO₃        :           O₂

                        2            :           3

                        4            ;          3/2×4 = 6 mol

Litters of oxygen at STP:

PV = nRT

V = nRT/P

V = 6 mol × 0.0821 atm.L/mol.K × 273 K / 1atm

V = 134.5 L / 1

V = 134.5 L

One isotope of nitrogen has 7 protons and 8 neutrons. Which is the correct reference for this isotope? A.
nitrogen-15

B.
nitrogen-8

C.
nitrogen-7

D.
nitrogen-1

Answers

D nitrogen-1 because you divide the two numbers to get what left of the nitrogen

Which substance cannot be decomposed by a chemical change? 1. HI
2. AlCl3
3. H2O
4. Cu

Answers

Final answer:

Among the substances listed, copper (Cu) is the one that can't be decomposed by a chemical change. This is because it is an element, composed of a single type of atom, and does not break down further in a chemical reaction.

Explanation:

The substance that cannot be decomposed by a chemical change among the given options is Cu, which stands for copper. In the context of chemistry, substances that cannot be decomposed into simpler substances by chemical means are called elements. Copper, denoted by the symbol Cu, is one such element. Unlike compounds such as HI, AlCl3, and H2O, elements like copper are composed of a single type of atom and therefore cannot be broken down further through chemical reactions.


Learn more about Chemical Decomposition here:

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Final answer:

The substance that cannot be decomposed by a chemical change is Cu (Copper) because it is an element and cannot be broken down into simpler substances through chemical changes.

Explanation:

The substance among the options provided that cannot be decomposed by a chemical change is Cu or Copper. This is because Copper is an element, and elements are substances made up of only one type of atom. They cannot be broken down into simpler substances by chemical reactions. On the other hand, HI (Hydroiodic acid), AlCl3 (Aluminum chloride), and H2O (Water) are all compounds, which consist of two or more elements chemically combined in a fixed ratio. These can be decomposed into their constituent elements through various chemical reactions.

Learn more about Decomposition by Chemical Change here:

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A gas mixture contains 1.61 moles of hydrogen and 2.31 moles of oxygen. What is the mole fraction of oxygen?a) 0.41
b) 0.59
c) 2.31
d) 3.92​

Answers

Answer: option B. 0.59

Explanation:Please see attachment for explanation

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