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3 years ago

Questions. Which element is number 14 on the periodic table?

Chemistry

2 answers:

adell [148]3 years ago

6 0

Answer:

silicon

Explanation:

the 14th element in the periodic table of elements.

cricket20 [7]3 years ago

4 0

Answer:

silicon

Explanation:

the atomic number is 14

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A sample of hydrogen gas at a pressure of 977 mm Hg and a temperature of 32 °C, occupies a volume of 11.3 liters. If the gas is

IrinaK [193]

Answer : The volume of gas sample will be, 9.93 L

Explanation :

Charles' Law : It states that volume of the gas is directly proportional to the temperature of the gas at constant pressure and number of moles of gas.

Mathematically,

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

where,

$V_1\text{ and }T_1$ are the initial volume and temperature of the gas.

$V_2\text{ and }T_2$ are the final volume and temperature of the gas.

We are given:

$V_1=11.3L\\T_1=32^oC=(32+273)K=305K\\V_2=?\\T_2=-5^oC=(-5+273)K=268K$

Now put all the given values in above equation, we get:

$\frac{11.3L}{305K}=\frac{V_2}{268K}\\\\V_2=9.93L$

Therefore, the volume of gas sample will be, 9.93 L

6 0

4 years ago

Energy pyramid worksheet

Taya2010 [7]

Answer:

From top to bottom coyote, crow, squirrel, then acorn

Explanation:

The coyote has the least amount of energy and its the biggest predator so it belongs at the top. The crows eat squirrels and the squirrels eat acorns.

6 0

3 years ago

The stem of a plant is made of several types of tissue that work together.

jeka94

Answer is tissue - :)

3 0

3 years ago

As fuel is burned in an airplane, it seems to disappear from the tank, suggesting that matter is destroyed during the reaction.

gregori [183]

Answer:

Well we know that matter is neither created nor destroyed by chemical reactions or physical transformations. It is not destroyed it simply was converted to gas. =D

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3 years ago

Chiara knows that weight is affected by gravitational pull. She is putting together a poster to display in her classroom.

Tanya [424]

Answer: A

Explanation: 150 lb * 1/6 = 25 lb

8 0

3 years ago

Read 2 more answers