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lbvjy [14]
3 years ago
9

Please help ! its urgent!!

Chemistry
1 answer:
ArbitrLikvidat [17]3 years ago
5 0

Answer:

D

Explanation:

Respiration is the process by which you get energy from food. So energy in food is converted to a form that can be used by the body

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Which statement describes absolute and apparent brightness?
Natali5045456 [20]

<u><em>NOTES TO TAKE DOWN: </em></u>

<em>Apparent brightness is a human measurement, and it would change for each star if the measurement were taken from another location. The more precise counterpart of apparent brightness is called absolute brightness (or absolute magnitude) and is the measure of the luminosity of a star, but on a common scale.</em>

<u><em>ANSWER:</em></u>

<em>Absolute brightness is the actual amount of light produced by the star, whereas apparent brightness changes with distance from the observer.</em>

<em />

8 0
3 years ago
Three compounds containing potassium and oxygen are compared. Analysis shows that for each 1.00 g of O, the compounds have 1.22
kicyunya [14]
<span>The law of proportion states that elements combine in whole number ratios. The gram readings for K are multiples of each other, both in grams and moles.
Let us compare the ratios:
</span>2.44 grams/1.22 grams = 2
<span>4.89 grams/2.44 grams = 2</span>

<span>Therefore, Potassium always combines with Oxygen in a ratio of 2  is to 1.</span>
4 0
4 years ago
Moseley made revisions to the periodic table that resolved some of the problems with Mendeleev’s version. Which of these was a r
sveticcg [70]
Thanks to Moseley's revision, the importance of the atomic number was acknowledged and it explained why some elements seemed to be out of their place, even though they were actually not.
3 0
3 years ago
Read 2 more answers
What element has 1 proton, 1 neutron, and 2 electrons?
Olegator [25]

Answer:

Tritium

Tritium is a hydrogen isotope consisting of one proton, two neutrons and one electron. It is radioactive, with a half-life of 12.32 years.

Explanation:

hope it helps :)))

6 0
3 years ago
How many moles of hydrogen gas will be produced when 12 g of Mg will react completely with excess of an acid according to the fo
lina2011 [118]

Answer:

0.49 mol

Explanation:

Step 1: Write the balanced equation

Mg + 2 HCI ⇒ MgCl₂ + H₂

Step 2: Calculate the moles corresponding to 12 g of Mg

The molar mass of Mg is 24.31 g/mol.

12g \times \frac{1mol}{24.31g} = 0.49mol

Step 3: Calculate the moles of H₂ produced by 0.49 moles of Mg

The molar ratio of Mg to H₂ is 1:1. The moles of H₂ produced are 1/1 × 0.49 mol = 0.49 mol.

7 0
4 years ago
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