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4 years ago

Why is the Meniscus important?

Chemistry

1 answer:

sergejj [24]4 years ago

7 0

It is important because it contributes to the movement of your knee

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Be sure to answer all parts.

Fudgin [204]

Answer:

2H₂ + O₂ → 2H₂O

Explanation:

Chemical equation:

H₂ + O₂ → H₂O

Balance chemical equation:

2H₂ + O₂ → 2H₂O

Step 1:

H₂ + O₂ → H₂O

Left hand side Right hand side

H = 2 H = 2

O = 2 O = 1

Step 2:

H₂ + O₂ → 2H₂O

Left hand side Right hand side

H = 2 H = 4

O = 2 O = 2

Step 3:

2H₂ + O₂ → 2H₂O

Left hand side Right hand side

H = 4 H = 4

O = 2 O = 2

7 0

3 years ago

Describe the changed that happened in the crayon and candle when they cooled after 3 to 5 minutes.

AleksandrR [38]

Answer:

The change was physical, meaning it went from liquid to solid, or the other way around.

Explanation:

4 0

3 years ago

The table shows the amount of radioactive element remaining in a sample over a period of time.

Lunna [17]

Answer:

1. The half-life is 22 years.

2. 132 years

Explanation:

1. Determination of the the half-life.

The half-life of an element is the time taken for half the element to decay.

From the table given above, the original amount of the element 45 g. If we divide 45 by 2, we'll have 22.5 g as half the original amount of element.

Now, the time taken to obtain 22.5 g as shown from the table is 22 years.

Thus, the half-life the element is 22 years.

2. Determination of the time.

Original amount (N₀) = 308 g

Amount remaining (N) = 4.8125 g

Time (t) =?

Next, we shall the number of half-lives that has elapsed. This can be obtained as follow:

Original amount (N₀) = 308 g

Amount remaining (N) = 4.8125 g

Number of half-lives (n) =?

N = 1/2ⁿ × N₀

4.8125 = 1/2ⁿ × 308

Cross multiply

4.8125 × 2ⁿ = 308

Divide both side by 4.8125

2ⁿ = 308 / 4.8125

2ⁿ = 64

Express 64 in index form with 2 as the base.

2ⁿ = 2⁶

n = 6

Thus, 6 half-lives has elapsed.

Finally, we shall determine the time. This can be obtained as follow:

Number of half-lives (n) = 6

Half-life (t½) = 22 years

Time (t) =?

n = t / t½

6= t / 22 years

Cross multiply

t = 6 ×22

t = 132 years.

Thus, the time taken is 132 years.

6 0

3 years ago

The graph below shows how solubility changes with temperature.

Otrada [13]

The two solutions that have similar solubilities at 40°C will be Na₂HAsO₄ and Na₂SO₄.

<h3>What is solubity ?</h3>

It is the ability of a solute to be dissolved, especially in water.

As the temperature increases the solubility of the gas generally decreases"

According to given information and graph attached as reference ;

Solubility of NaCl (sodium chloride) at 40°C is 36.3 grams.
Solubility of Na₂SO₄ (sodium sulfate) at 40°C is 48.8 grams.
Solubility of Na₂HAsO₄ (sodium arsenate dibasic) at 40°C is 48.9
grams.
Solubility of Ba(NO₃)₂ (barium nitrate) at 40°C is 14.1 grams.
Solubility of Ce₂(SO₄)₃·9H₂O (ceasium sulfate nonahydrate) at 40°C is 6.2 grams.

Lear more about solubility here ;

brainly.com/question/19221092

#SPJ1

4 0

2 years ago

What is the mass of 23 moles of lithium atoms

allochka39001 [22]

Take 23mols and multiply it by the atomic mass of Li:

23mol * 6.94g/mol = 159.62g

5 0

3 years ago