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Tcecarenko [31]
3 years ago
8

15. A food sample contains 25 g carbohydrate, 8 g fat and 5 g protein. The energy content is:

Chemistry
1 answer:
Musya8 [376]3 years ago
6 0

Answer:

C) 170 Cal

Explanation:

We are given the composition of a food sample as;

Carbohydrate = 25 g

fat = 8 g

Protein = 5 g

We are needed to determine the energy content of the food;

We need to know the amount energy yielded by each food substance.

That is; carbohydrates and proteins generate 4 calories per gram while fats generates 9 calories per gram.

Therefore;

Amount of energy will be;

= (25 × 4 cal/g) + (8g × 9 cal/g) + (5 g × 4 cal/g)

= 172 cal

Approximately , 170 calories

Therefore, the energy content will be 170 calories

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Explanation:

Initial mass of the isotope 90-Sr in baby= 1.00 μg

Formula used :

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where,

N_o = initial mass of isotope

N = mass of the parent isotope left after the time, (t)

t_{\frac{1}{2}} = half life of the isotope  = 28.1 years

\lambda = rate constant

N=N_o\times e^{-(\frac{0.693}{t_{1/2}})\times t}

a) Time taken by the sample, t = 18 years

N=1.00 \mu g\times e^{-\frac{0.693}{28.1 years}\times 18 years}

N = 0.6415 \mu g

0.6415 μg  will remain after 18 years.

b) Time taken by the sample, t = 70 years

N=1.00 \mu g\times e^{-\frac{0.693}{28.1 years}\times 70 years}

N = 0.1779\mu g

0.1779 μg  will remain after 70 years.

3 0
3 years ago
Which of the following is an indicator of a chemical reaction?
yuradex [85]

Answer:

B

Explanation:

B is the best showing of a chemical reaction out of the choices

3 0
3 years ago
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What is a synthesis reaction? a reaction that occurs when two or more reactants combine into one product
dmitriy555 [2]

Answer:

A synthesis reaction is <em>a reaction that occurs when two or more reactants combine into one product.</em>

Explanation:

A reaction that occurs when two or more reactants combine into one product is called a synthesis reaction.

A reaction that occurs when one element within a compound is exchanged with another element is called a single replacement reaction.

A reaction that occurs when a substance combines with molecular oxygen, releasing light and energy is called combustion.

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3 years ago
What is the molarity of a 750 milliliters solution containing 54.0 grams of KBr (help me please)
ololo11 [35]

<u>Answer:</u> The molarity of KBr solution is 0.605 M

<u>Explanation:</u>

Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L.

The formula used to calculate molarity:

\text{Molarity of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (mL)}}       .....(1)

Given values:

Given mass of KBr = 54.0 g

Molar mass of KBr = 119 g/mol

Volume of the solution = 750 mL

Putting values in equation 1, we get:

\text{Molarity of solution}=\frac{54.0\times 1000}{119\times 750}\\\\\text{Molarity of solution}=0.605M

Hence, the molarity of KBr solution is 0.605 M

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3 years ago
Bubbling ammonia into a solution of bromic acid will produce what salt?
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<h3>✽ - - - - - - - - - - - - - - -  ~<u>Hello There</u>!~ - - - - - - - - - - - - - - - ✽</h3>

➷ Ammonium bromate

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

5 0
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