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aleksklad [387]

4 years ago

5

This age group walks and runs confidently, but may run into things, walks up and down stairs without assistance, scribbles in de

liberate directions, removes slip on clothing.

1 answer:

Slav-nsk [51]4 years ago

6 0

A baby, idk if that’s right, my bad if it isn’t

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Worksheet Ch.3: % Composition, Molarity, and Other Units for

Ann [662]

The percentage composition by mass of the elements in the compound are:

Ai. The percentage composition by mass of Na in 3.65 g of NaF is 54.8%

Aii. The percentage composition by mass of F in 3.65 g of NaF is 45.2%

Bi. The percentage composition by mass of Zinc in the compound is 67.1%

Bii. The percentage composition by mass of Sulfur in the compound is 32.9%

Percentage composition by mass of an element in a compound can be obtained by using the following formula: $Percentage = \frac{mass of Element}{mass of compound} * 100$

Ai. Determination of the percentage of Na in 3.65 g of NaF

Mass of Na = 2 g

Mass of NaF = 3.65 g

<h3>Percentage of Na =? </h3>

$Percentage = \frac{mass of element }{mass of compound} * 100\\\\Percentage of Na = \frac{2}{3.65} * 100$

<h3>Percentage of Na = 54.8%</h3>

Aii. Determination of the percentage of F in 3.65 g of NaF

Mass of F = 1.65 g

Mass of NaF = 3.65 g

<h3>Percentage of F =? </h3>

$Percentage = \frac{mass of element }{mass of compound } * 100\\\\Percentage of F = \frac{1.65}{3.65} * 100\\\\$

<h3>Percentage of F = 45.2%</h3>

Bi. Determination of the percentage composition of Zn in 48.72 g of the compound

Mass of Zn = 32.69 g

Mass of compound = 48.72 g

<h3>Percentage of Zn =? </h3>

$Percentage = \frac{mass of element}{mass of compound} * 100\\\\Percentage of Zn = \frac{32.69}{48.72} *100\\\\$

<h3>Percentage of Zn = 67.1%</h3>

Bii. Determination of the percentage composition of Sulphur in 48.72 g of the compound

Mass of Zn = 32.69 g

Mass of compound = 48.72 g

Mass of S = 48.72 – 32.69 g

Mass of S = 16.03 g

<h3>Percentage of S =? </h3>

$Percentage = \frac{mass of element}{mass of compound} * 100\\\\Percentage of S = \frac{16.03}{48.72} * 100\\\\$

<h3>Percentage of S = 32.9%</h3>

Learn more: brainly.com/question/1350382

3 0

3 years ago

Answer right pleases

Dominik [7]

Answer: Qualitative
Please mark brainliest

4 0

3 years ago

What is the equation for calculating gravitational potential energy on the Earth

DedPeter [7]

Gravitational potential energy = mass x g x height

(The g is measured in N/kg and is usually 9.8 or 10)

Full info in picture below:

3 0

3 years ago

Which element has 7 valence electrons? (2 points) nitrogen (N) neon (Ne) lithium (Li) chlorine (Cl)

vazorg [7]

It's chlorine, it's one of the few elements with 7 valence electrons

7 0

4 years ago

Read 2 more answers

what is the amount of heat energy released when 50.0 grams of water is cooled from 20.0 degrees Celcius to 10.0 degrees celcius

andre [41]

Answer:

The amount of heat released when 50 g of water cooled from 20°C to 10°C will be equal to - 2093 J.

Explanation:

Given data:

Mass of water = 50 g

Initial temperature= T1 = 20°C

Final temperature= T2 = 10°C

Specific heat of water= c = 4.186 J/g. °C

Amount of heat released = Q= ?

Solution:

Formula:

Q = m. C. ΔT

ΔT = T2 - T1

ΔT = 10°C - 20°C

ΔT = -10°C

Now we will put the values in formula.

Q = m. C. ΔT

Q = 50 g . 4.186 J/g. °C . -10°C

Q = - 2093 J

The amount of heat released when 50 g of water cooled from 20°C to 10°C will be equal to - 2093 J.

6 0

3 years ago

Read 2 more answers