CHEMISTRY HIGH SCHOOL

Which physical changes are endothermic?(1) melting and freezing
(2) melting and evaporating
(3) condensation and sublimation
(4) condensation and deposition

Answers

Answer 1
Answer: Melting and evaporating are endothermic. 
Answer 2
Answer:

Melting and evaporating are the physical changes that are endothermic. Therefore, the correct option is option 2.

Physical modifications are those that modify a chemical substance's shape yet do not affect its chemical content. Physical changes may normally be utilised to separate compounds to chemical elements and simpler compounds, but they cannot be utilised for separate mixtures to their individual components. When something changes physically but not chemically, it is said to have undergone a physical transformation. This contrasts to the idea of a chemical change, when a material's composition changes or a substance or substances mix or separate to generate new compounds. Melting and evaporating are the physical changes that are endothermic.

Therefore, the correct option is option 2.

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An element, X, has 2 isotopes, X-32 with an abundance of 31.5% and X-35 with an abundanceof 68.5%. What is the average atomic mass of element X?

The components in a mixture do not combine chemically true or false?

Answers

True
A mixture is a combination of two or more substances in any proportions. The substances in a mixture do not combine chemically, so they retain their physical properties

The bond formed from electrons that are transferred is a(n) ionic bond hydrogen bond covalent bond

Answers

Ionic bonds are formed from electrons completely transferred.

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Answers

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Which element has the greatest electronegativity?a. Chlorine
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c. Sulfur
d. Phosphorus
e. Fluorine

Answers

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What is the molarity of 1.5 liters of an aqueous solution that contains 52 grams of lithium fluoride, LiF, (gram-formula mass =26 grams/mole)?(1) 1.3 M (3) 3.0 M
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Answers

The answer is (1) 1.3 M. The first thing you need to do is to convert the unit of gram to mole. The mol number of LiF is 52/26=2 mol. Then using the volume to calculate the molarity: molarity=2/1.5=1.3 M.

Which of the following is not one of the three largest sources of materials needed to form carbon compounds?natural gas
petroleum
coal
wood

Answers

Answer:

The correct answer is option D, wood

Explanation:

The three major source of carbon on earth are – coal , petroleum and natural gas

Several carbon based products are formed from these three source after  processing. For example – coke and charcoal are produced from coal, like wise ink and paints also have coal as one of the constituents substance. Carbon black is also extracted from coal. Similarly,  from petroleum all lubricating oils and wax are derived using distill filtration.  

WOOD is not one of the three largest sources of materials needed to form carbon compounds. So the answer is wood.

Hope this helps :)
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