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Bas_tet [7]
3 years ago
6

Photosynthesis is the process in which plants use sunlight to convert water and carbon dioxide into glucose and oxygen. Which of

these statements explains why photosynthesis is a chemical change?
A New substances are formed with properties that are different from the original substances.

B New substances are formed but their properties are the same as the original substances.

C No new substance is formed but some of the properties change.

D No new substance is formed and the change is easily reversible. Which of the following images shows a chemical change?​
Chemistry
1 answer:
zvonat [6]3 years ago
6 0

Answer:

answer is B new substances are formed but their properties are the same as the original substances.

Explanation:

Photosynthesis is the process through which plants convert light energy into chemical energy.

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An element consists of two isotopes. One with a mass of 79.95 amu and an abundance of 29.9%. The second isotope has a mass of 81
galina1969 [7]

 the molar  mass of the element  is  81.36 g/mol

<u><em>calculation</em></u>

step 1 : multiply  each %abundance  of the isotope  by   its mass  number

that is 79.95 x 29.9 =2391

           81.95 x 70.1  = 5745

Step 2: add them together

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Step 3: divide by 100

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5 0
3 years ago
d) A short ton of coal holds about 2.24 x 107 J of energy and costs about $56.45 per short ton. How many Joules of energy in the
Feliz [49]

Answer:

396811.337 J

Explanation:

The cost of one short ton of coal = $56.45

The energy related to the short ton of coal = 2.24\times 10^{7}\ J

Thus, As according to the question,

$56.45 of coal have 2.24\times 10^{7}\ J of energy.

$1 of coal have \frac{2.24\times 10^{7}}{56.45}\ J of energy.

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