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3 years ago

Which quantity is equivalent to 50 kilocalories

Chemistry

1 answer:

Tanya [424]3 years ago

7 0

I believe this problem have these following choices:

5,000 cal

0.05 cal

5 x 10^3 cal

5 x 10 ^4 cal

Now 1 kilocalorie = 1000 calories, therefore:

50 kilocalories * (1000 calories / 1 kilocalorie) = 50,000 calories

Since there are 4 zeroes, so the scientific notation is:

5 x 10 ^4 cal (ANSWER)

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How many grams of carbon (C) would be present in carbon monoxide (CO) that contains 2.666 grams of oxygen (O)? For example if th

oee [108]

Given :

Mass of oxygen containing carbon monoxide (CO) is 2.666 gram .

To Find :

How many grams of carbon (C) would be present in carbon monoxide (CO) that contains 2.666 grams of oxygen (O) .

Solution :

By law of constant composition , a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.

So , volume of solution does not matter .

Moles of oxygen , $n=\dfrac{2.666}{16}=0.167\ mole$ .

Now , molecule of CO contains 1 mole of C .

So , moles of C is also 0.167 mole .

Mass of carbon , $m=12\times 0.167=2\ g$ .

Therefore , mass of carbon is 2 grams .

Hence , this is the required solution .

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2 years ago

Drag each tile to the correct location. Identify the verb used in each sentence.

miskamm [114]

Answer:

1) subjunctive

2) conditional (most likely)

3) conditional

4) subjunctive

5) conditional

6) conditional

Explanation:

subjunctive mood expresses a wish

conditional mood = if (event), (result)

3 0

3 years ago

Help what is a b c please I want help this my quiz quick

stich3 [128]

Answer:

A= sum(mass*percent abundance)

M 100

=(23.985*78.70)+(24.946*10.13)+(25.983*11.17)/100

= 24.3

2. The element is Magnesium.

3. 2412Mg,2512Mg and 2612Mg

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2 years ago

Describe how the surface area affect the rate of a reaction

leva [86]

When we increase the surface area of an object, more atoms are exposed. Since more atoms are exposed, the atoms can react faster, and this is why the rate of a reaction increases when the surface area increases.

For example, lets say we want to heat a potato. If we just put the whole potato in the microwave, it will take a long time for the potato to get thoroughly heated. However, if we chop the potato into smaller pieces, we will observe that it gets heated much faster. This is because we increased the surface area of the potato, which resulted in more potato atoms to be exposed to the heat, and caused the reaction to be faster.

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2 years ago

Why are the average atomic masses of some of the elements in parentheses?

Pie

Because its only representing the most stable isotope of that element but its considered the atomic mass and not average atomic mass

4 0

3 years ago