CHEMISTRY MIDDLE SCHOOL

What is answer and why
what is answer and why - 1

Answers

Answer 1
Answer: D because O3 means oxygen times 3 times it self so you add another oxygen partial it becomes O4

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If we use water everyday why do we not run out of freshwater?

Answers

Answer:

We do not run out of water because of the water cycle

Explanation: The water cycle, also known as the hydrologic cycle or the hydrological cycle, describes the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly constant over time but the partitioning of the water into the major reservoirs of ice, fresh water, saline water and atmospheric water is variable depending on a wide range of climatic variables.

If you don't already know this go hang out with dunce face aka denki kaminari

you both most likely share the same brain cell as both him and Kirishima

What is the difference between endothermic and exothermic reactions?

Answers

Endothermic take in energy.
Exothermic give out energy.


I remember it by imaging that the energy is either 'ENtering' or 'EXiting'.

Hope this helps.

Final answer:

Endothermic reactions absorb energy from the environment and make it cooler, such as photosynthesis in plants, while exothermic reactions release energy into the environment and make it hotter, like burning wood in a fireplace.

Explanation:

Endothermic and exothermic reactions are different in terms of energy absorption and release. In an endothermic reaction, energy in the form of heat is absorbed from the surroundings into the system (reaction). This causes the environment to become cooler. An example would be the process of photosynthesis in plants.

In contrast, an exothermic reaction releases energy into the surroundings. As a result, the environment around an exothermic reaction heats up. An example of an exothermic reaction is combustion, such as the burning of wood in a fireplace.

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A 500 gram piece of metal has a volume of 2.75cm3 what is the density

Answers

Answer: 181.82\ g/cm^3

Explanation:

Given that the volume of a piece of metal = 2.75\ cm^3

Mass of piece of metal= 500 g

Formula to calculate the density is given by :-

\text{Density}=\frac{\text{Mass}}{\text{Volume}}

Then, the density of piece of metal is given by :-

\text{Density of piece of metal}=(500)/(2.75)\n\n\Rightarrow\ \text{Density}=181.818181818\approx181.82\ g/cm^3  [Rounded to the nearest two decimal places.]

Hence, its density of piece of metal= 181.82\ g/cm^3
density is mass / volume so it is 500 / 2.75=181.82 g/cm3

Given the balanced equation representing a reaction:Al2(SO4)3 +6NaOH ==> 2Al(OH)3 + 3Na2SO4

The mole ratio of NaOH to Al(OH)3 is

(1) 1:1 (2) 3:1

(3) 1:3 (4) 3:7

Answers

The answer is number 2. 3:1. This is the simplified value of 6:2 which came from 6NaOH:2Al(OH)3. The original ratio is 6:2 but it can be simplified through dividing it each by 2. So 6 divided by 2 equals to 3 and 2 divided by 2 is 1. Therefore the simplified ratio is 3:1.

URGENT!!True or false: Light waves, gamma rays, and ocean waves are all 3 examples of energy traveling in waves.

Answers

Answer:

False

Explanation:

Ocean waves are something you can physically see whereas Gamma Rays and Light Waves are something on the Electromagnetic Spectrum.

Is it true oxygen is an excellent solvent that is capable of dissolving just about anything?

Answers

Well water dissolves many substances more than any other liquid so yes I would say it is capable of dissolving just about everything. 
Well water dissolves many substances more than any other liquid so yes I would say it is capable of dissolving just about everything. 
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