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nexus9112 [7]
3 years ago
9

write an apology letter to your principal telling him why you were not in the mathematics competition.in 4000 words​

Chemistry
1 answer:
tensa zangetsu [6.8K]3 years ago
3 0
OK now that’s a lot to ask for but if you want someone to actually do that you’re gonna need a lot more points
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Classify each of the following changes as Physical or Chemical:
ddd [48]

Explanation:

Physical changes are the changes that does not lead to any change in chemical composition of a substance.

For example, mass, density, volume are all physical changes.

On the other hand, a change that leads to formation of a new compound by changing the chemical composition of reactants or combining atoms is known as a chemical change.

For example, combustion, toxicity, reactivity etc are all chemical changes.

Therefore, given changes are identified as follows.

  • Coal burning : It is a combustion reaction. Hence, it is a chemical change.
  • Ice melting : Physical state of water changes from solid to liquid. Hence, it is a physical change.
  • mixing chocolate syrup with milk : No new compound is forming as there is no chemical reaction occurring. Hence, it is also a physical change.
  • explosion of a firecracker : It shows reactivity of fire cracker. Hence, it is a chemical reaction.
  • magnetizing of a screwdriver : It shows physical attraction between the magnet and screwdriver. Hence, it is a physical change.

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3 years ago
What can you infer about particle's size?
gayaneshka [121]

Answer:

particle size analysis, particle size measurement, or simply particle sizing is the collective name of the technical procedures, or laboratory techniques which determines the size range, and/or the average, or mean size of the particles in a powder or liquid sample.

Explanation:

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2 years ago
How are lysosomes and vacuoles the same? How are<br> they different?
andriy [413]

Answer:

This is the answer they're looking for:

Lysosomes and vacuoles both deal with waste materials. Lysosomes break down waste materials, and vacuoles store waste materials in the cell temporarily before the cell get rids of them.

Explanation:

i hope you'll pick me for brainiest

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3 years ago
What do you already know about the role of water within your body?
Fudgin [204]

Answer:

it helps us with our blood (Little)

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Moles of phosphorous in 15-35-15 fertilizer in 10g
guapka [62]

<span>The composition of a fertilizer is usually express in NPK number. NPK number is in terms of Percent by mass of the said element which are Nitrogen, Phosphorus and Potassium. A 15-35-15 fertilizer has 15% Nitrogen, 35% Phosphorous, and 15% Potassium by mass. If you have 10 g of this fertilizer, to get the number of moles of phosphorus, you multiply the mass by 35%, which is equal to 10*0.35 or 3.5 g phosphorus. Then you divide the calculated mass of phosphorous by its molar mass which is 30.97 g/mol. Therefore, you have 3.5/30.97 which is equal to 0.1130 mol Phosphorus. This is the amount of Phosphorus in moles in the fertilizer.</span>

6 0
3 years ago
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