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3 years ago

7

What is use in measuring

2 answers:

Taya2010 [7]3 years ago

7 0

Answer:

Explanation:

Strictly speaking, the ruler is the instrument used to rule straight lines and the calibrated instrument used for determining length is called a measure, however common usage calls both instruments rulers and the special name straightedge is used for an unmarked rule.

Nutka1998 [239]3 years ago

6 0

Answer:

a ruler or measuring cups are ways of measuring

Explanation:

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A nuclear fission reaction has mass difference between the products and the reactants of 3.86 g. Calculate the amount of energy

iris [78.8K]

<u>Answer:</u> The amount of energy released by the reaction is $3.47\times 10^{14}J$

<u>Explanation:</u>

To calculate the energy released, we use Einstein equation, which is:

$E=\Delta mc^2$

where,

$\Delta m$ = difference between the masses of products and reactants = 3.86 g = 0.00386 kg (Conversion factor: 1 kg = 1000 g)

c = speed of light = $3\times 10^8m/s$

Putting values in above equation, we get:

$E=(3.86\times 10^{-3}kg)\times (3\times 10^8m/s)^2$

$E=3.47\times 10^{14}J$

Hence, the amount of energy released by the reaction is $3.47\times 10^{14}J$

3 0

3 years ago

Be sure to answer all parts. Calculate the pH of the following two buffer solutions: (a) 1.4 M CH3COONa/1.6 M CH3COOH. (b) 0.1 M

aalyn [17]

Answer:

a) pH = 4.68 (more effective)

b) pH =4.44.

Explanation:

The pH of buffer solution is obtained by Henderson Hassalbalch's equation.

The equation is:

$pH =pKa +log\frac{[salt]}{[acid]}$

a) pKa of acetic acid = 4.74

[salt] = [CH₃COONa] = 1.4 M

[acid] = [CH₃COOH] = 1.6 M

$pH = 4.74 + log \frac{1.4}{1.6}= 4.68$

This is more effective as there is very less difference in the concentration of salt and acid.

b) pKa of acetic acid = 4.74

[salt] = [CH₃COONa] = 0.1 M

[acid] = [CH₃COOH] = 0.2 M

$pH = 4.74 + log \frac{0.1}{0.2}= 4.44$

3 0

4 years ago

If the pH of a solution is 5, what is the hydrogen ion concentration?

Gnoma [55]

Yo sup??

We know that

pH=-log[H+]

[H+]=10^(-pH)

pH=5

therefore

[H+]=10^(-5)

The medium is acidic

Hope this helps.

5 0

4 years ago

Is the follow trait inherited or acquired? “speaking English”

AnnZ [28]

Acquired, because everyone has to learn how to speak English you can’t just be born and know how to speak.

5 0

4 years ago

An element has a half-life of 5.0 days. How many days would

Olin [163]

Answer:

15 days

Explanation:

Given half-life = 5 days => k = 0.693/half-life = 0.693/5 days⁻¹

A = A₀e^-k·t => t = ln(A/A₀) / -k = ln(1/8) / -0.1386 days⁻¹ = 15 days

3 0

3 years ago