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2 years ago

Anybody wanna do a zoom

Chemistry

1 answer:

Ksivusya [100]2 years ago

8 0

For what exactly ? just for fun or for educational purposes?

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

Musya8 [376]

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

6 0

2 years ago

What is the mass in grams of 7.5 x 10^15 atoms of nickel, Ni?

statuscvo [17]

<h3>Answer:</h3>

7.3 × 10⁻⁷ g Ni

<h3>General Formulas and Concepts:</h3>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

Reading a Periodic Table
Using Dimensional Analysis
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<h3>Explanation:</h3>

<u>Step 1: Define</u>

7.5 × 10¹⁵ atoms Ni

<u>Step 2: Identify Conversions</u>

Avogadro's Number

Molar Mass of Ni - 58.69 g/mol

<u>Step 3: Convert</u>

Set up: $\displaystyle 7.5 \cdot 10^{15} \ atoms \ Ni(\frac{1 \ mol \ Ni}{6.022 \cdot 10^{23} \ atoms \ Ni})(\frac{58.69 \ g \ Ni}{1 \ mol \ Ni})$
Multiply: $\displaystyle 7.30945 \cdot 10^{-7} \ g \ Ni$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 2 sig figs.</em>

7.30945 × 10⁻⁷ g Ni ≈ 7.3 × 10⁻⁷ g Ni

3 0

2 years ago

A couple is planning to have a child. the father-to-be has six fingers, a dominant trait. His genotype is Ff. His wife has five

postnew [5]

I think it’s C.1/2 because the child could get five fingers like his mother or six fingers like his dad

4 0

3 years ago

Determine whether each statement is a description of a physical property or a chemical property.

Sunny_sXe [5.5K]

Answer:

Paper=chemical

Salt=physical

Explanation:

5 0

3 years ago

Which one is a Synthesis reaction?

sveta [45]

Answer:

the second one is synthesis reaction

3 0

2 years ago