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3 years ago

Francine makes several measurements of the mass of a metal block. The data set is shown in the table below.

Chemistry

1 answer:

BARSIC [14]3 years ago

3 0

Answer:

Mean

Explanation:

The mean of a series of measurements is calculated when all the measurements are added up and then divided by the number of measurements taken, as follows:

Sum of Measurements = 20.73 + 20.76 + 20.68 + 20.75 = 82.92

As there are 4 measurements, the mean is:

Mean = 82.92 / 4 = 20.73

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What is radioactive decay?

swat32

Answer:

Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay, beta decay, and gamma decay, all of which involve emitting one or more particles or photons.

Explanation:

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3 years ago

How many moles are represented by 3.01x10^23 helium atoms

Alex787 [66]

Answer:

b. 0.50 moles

Explanation:

To solve this problem we use Avogadro's number (6.023x10²³ atoms/mol).

By dividing the number of atoms (or molecules) by that number, we can calculate how many moles they represent.

3.01x10²³ atoms ÷ 6.023x10²³ atoms/mol = 0.50 moles

So the answer is option b. 0.50 moles.

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3 years ago

Which of the following would be produced when two or more different atoms bond chemically?

ExtremeBDS [4]

Answer:

When two or more atoms chemically bond with each other, the resultant chemical structure is a molecule. The familiar water molecule, H2O, consists of two hydrogen atoms and one oxygen atom; these bond together to form water, irdk but it's either C or D

Explanation:

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3 years ago

What layer of the sun is after the core

Sholpan [36]

Answer:

radiative zone

Explanation:

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3 years ago

4. The mass of a silver liberty (coin) was measured three times and each measurement was made

Vaselesa [24]

Answer:

The average mass of the gold coin reported to five significant figures, even though you had to divide by "3" to obtain the average.

Explanation:

Given that,

The mass of a silver liberty was measured three times and each measurement was made to five digits.

The mass values are,

$m_{1}=12.519\ g$

$m_{2}=12.521\ g$

$m_{3}=12.496\ g$

The average mass of the gold coin is 12.512 g.

We know that,

Significant figures :

Significant figures is explained the nonzero, leading zero and zeros between two nonzero digits.

For example,

The digits is 0.003405

In the digit, 345 = nonzero

0.00 = leading zero

The average mass of the gold coin reported to five significant figures because average mass is 12,512. All digits are nonzero.

Nonzero digit are significant.

Hence, The average mass of the gold coin reported to five significant figures, even though you had to divide by "3" to obtain the average.

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4 years ago