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GuDViN [60]
3 years ago
15

Use the periodic table below to answer the following questions.

Chemistry
1 answer:
kap26 [50]3 years ago
5 0

Answer:

answer is D

Explanation:

3B

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Stars which never disappear below the horizon are called:______ stars.
My name is Ann [436]

Answer:

Stars which never disappear below the horizon are called <u>circumpolar</u> stars.

4 0
3 years ago
A reaction between liquid reactants takes place at in a sealed, evacuated vessel with a measured volume of . Measurements show t
anzhelika [568]

The given question is incomplete, the complete question is:

A reaction between liquid reactants takes place at 10.0 °c in a sealed, evacuated vessel with a measured volume of 35.0 L. Measurements show that the reaction produced 28. g of dinitrogen difluoride gas. Calculate the pressure of dinitrogen difluoride gas in the reaction vessel after the reaction. You may ignore the volume of the liquid reactants. Round your answer to 2 significant digits. pressure:atm

Answer:

The correct answer is 0.28 atm.

Explanation:

The temperature mentioned in the given reaction is 10 degree C, which after conversion becomes 283 Kelvin (273+10 = 283K).  

The volume mentioned in the reaction is 35 Liters.  

The reaction produced 28 grams of dinitrogen difluoride gas (N2F2). The n or the no of moles of the gas can be determined with the help of the formula:  

moles of N2F2 = mass/molar mass

= 28/66 (molar mass of N2F2 is 66 g/mol)

= 0.424

The pressure of the gas can be determined by using the equation of the ideal gas law, that is, PV = nRT

P * 35 = 0.424 * 0.0821 * 283

P = 0.28 atm

3 0
3 years ago
A typical thickness for a sheet of paper is 0.004 inches. If you fold a sheet of paper once, the thickness of the folded paper w
Eduardwww [97]

Answer:

Please see the pictures attached below

The first picture has the values and the second has the formulas to construct the spreadsheet.

Explanation:

To construct the spreadsheet you should do the following:

1. First name the four columns as:

Number of folds

Thickness in inches

Thickness in feet

Thickness in miles

2. In the first column "Number of folds" put the numbers from 0 to 50 in order to calculate the thickness of each fold.

3. In the second column "Thickness in inches" put the following formula to show that each fold of a sheet is equal to multiply by 2 the original fold:

Thickness in inches = (thickness in inches(number of folds-1))*2

When the number of folds is 1, the formula will be:

Thickness in inches = 0.000 * 2 = 0.000

When the number of folds is 2, the formula will be:

Thickness in inches = 0.004 * 2 = 0.008

When the number of folds is 3, the formula will be:

Thickness in inches = 0.008 * 2 = 0.016

When the number of folds is 4, the formula will be:

Thickness in inches = 0.016 * 2 = 0.032

And so on until 50.

3. In the third column you only multiply by 0.08333 the value of inches to convert it to feet.

4. And in the fourth column you should multiply the value of inches by 0.0000157828 to convert it to miles.

4 0
3 years ago
Compared to the charge and mass of a proton, an electron has _____.
Darya [45]

Answer:

1/1836

Explanation:

An electorn's mass is so little that it is negligible.

7 0
3 years ago
What is a nucleus, chromosome, chlooplasts,cell membrane, cytoplasm?
stiks02 [169]

nucleus: directs

chromosome: genetic

chloroplasts: convert energy from sun

cell membrane: controls

cytoplasm: holds

8 0
3 years ago
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