Air is a mixture whereas water is a compound explain

Answers

Answer 1

Answer:

Answer:

Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. Example: Air

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water $H_2O$

Air is a mixture of various gases , dust particles and water vapors which do not react chemically and thus the constituents retain their chemical properties. Water is a compound which is formed by chemical combination of hydrogen and oxygen which lose their individual chemical properties.

Answer 2

Answer: Air is a mixture as in it has different types of gases mixed in the air such as Nitrogen, Oxygen, and Carbon Dioxide, but none of these are bonded or fused together. Water is a compound of 1 Oxygen and 2 Hydrogen molecules bonded together, as in permanently together. You can think of Air as a bowl of trail mix, everything in there is separable, and a compound as in something inseparable (Unless done using scientific methods).

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8. What is the heat of reaction when hydrogen and oxygen combine to form water?2H2(g) + O2(g) → 2H2O(1)
(AHC H20(I) = -285.8 kJ/mol)
A -120.9 kJ
B-241.8 kJ
C-571.6 kJ
D-285.8 kJ

Answers

Answer:

The heat of reaction when hydrogen and oxygen combine to form water is :

C. 571.6 kJ

Explanation:

Enthalpy Change = The enthalpy change for the formation of 1 mole of the substance from their standard state is called the enthalpy of formation.

This is intensive quantity as it is fixed for 1 mole .

Intensive properties = Those properties which are independent on the amount of the substance are intensive properties.

The value of these quantities does not get halve if you divide the substance into two equal parts. example , density, refractive index.

However , the enthalpy of reaction is extensive. Because on increasing the amount the value of the enthalpy also get doubles

Hence for this reaction :

$2H_(2)(g)+O_(2)\rightarrow 2H_(2)(l)$

Its value is -285.8 kJ for 1 mole

And here two moles are present . so the value of molar enthalpy is:

-285.8 x 2 = -571.6 kJ

Why don’t water and oil mix when the two liquids are poured into the same container?

Answers

The oil always floats to the top because it is less dense than water. oil and water don't mix because water molecules are more attracted to each other than to oil molecules

An ice cube is placed in a plastic cup on the lab table. Students record the mass of the ice cube and the plastic cup as 5 grams. One hour later the ice cube completely melts, turning into liquid water. Then, the students record the mass of the water and the cup. What is the mass of the water and plastic cup?

Answers

The answer is still 5 grams because mass can not be changed or destroyed.

Final answer:

The mass of the system consisting of the ice cube and the plastic cup will remain 5 grams even after the ice completely melts. This is because of the Conservation of Mass principle, which states that mass is not lost during a phase change.

Explanation:

The principle operating in this scenario is called the Conservation of Mass. In this specific context, this principle means that the mass of an object or a system of objects will remain the same regardless of the changes it may undergo, as long as no mass enters or leaves the system. In the case of an ice cube melting, although the physical state (phase) of the water changes from solid (ice) to liquid (water), its mass does not change.

So when an ice cube that weighs 5 grams (along with the cup) melts, it turns into an equivalent mass of liquid water. That means even after the ice has completely melted into water, the mass of the water and the plastic cup will still be 5 grams.

This is because during the phase change, only the state of the matter is altered (from solid to liquid), not its mass. The water molecules in the ice rearrange themselves and move apart during melting allowing the ice to become liquid water, but the number of molecules and thus the mass stays the same.

Learn more about Conservation of Mass here:

brainly.com/question/33386293

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In what ways are organisms in the Bacteria and Archae Kingdoms alike?

Answers

Archaea have generally the same shape, size, and appearance as bacteria. Like bacteria, Archaea multiply by binary fission and move primarily by means of flagella. These morphological similarities can make it difficult to visually tell a bacterium and an archaean apart. Additionally, archaea are more phylogenetically similar to eukarya than bacteria is to either of them.

What is the name of the process plants use to make the energy (food) they need?A symbiosis
B respiration
C pollination
D photosynthesis

Please help.

Answers

the answer you looking for is D

Describe two ways that thermal energy transfer in earth changes the land

Answers

There are three methods of thermal energy transfer: conduction, convection, and radiation. Air molecules that come into contact with the warmer land and surface of the oceans and lakes increase their thermal energy through conduction.

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