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3 years ago

Which best describes a compound such as sodium

Chemistry

1 answer:

tresset_1 [31]3 years ago

3 0

a pure substance that can be separated into different elements by chemical means

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Calculate the volume in L of 12.9 g of NO2 at STP.

d1i1m1o1n [39]

Answer:

6.28 L

Explanation:

Given data:

Volume of NO₂ = ?

Mass of NO₂ = 12.9 g

Temperature and pressure = ?

Solution:

First of all we will calculate the number of moles of gas.

Number of moles = mass/molar mass

Number of moles = 12.9 g/ 46 g/mol

Number of moles = 0.28 mol

At standard temperature and pressure 1 mole of gas occupy 22.4 L volume.

Thus,

0.28 mol × 22.4 L/1 mol

6.27 L ≅ 6.28 L

3 0

3 years ago

what is the energy change if an ice cube of mass 50 grams (initially at it's normal melting point) was converted to steam at the

Kipish [7]

I think it is evaporation hope this helped

8 0

3 years ago

Sarah is running a race and is almost to the finish line. In the last 5 seconds, her velocity changes from 2m/s to 4m/s. What is

Blababa [14]

Answer:

$\boxed {\boxed {\sf a= \frac {2}{5} \ or \ 0.4 \ m/s^2}}$

Explanation:

Acceleration is found by dividing the change in velocity by the time. The formula is:

$a= \frac {v_f-v_i}{t}$

where $v_f$ is the final velocity, $v_i$ is the initial or starting velocity, and $t$ is the time.

Her velocity changes from 2 meters per second to 4 meters per second in the 5 seconds. Therefore:

$v_f= 4 \ m/s \\v_i= 2 \ m/s \\t=5 \ s$

Substitute the values into the formula.

$a= \frac { 4 \ m/s- 2 \ m/s}{5 \ s}$

Solve the numerator and subtract.

$a= \frac { 2 \ m/s}{5 \ s}$

Divide.

$a= \frac{2}{5} \ m/s/s= \frac{2}{5} \ m/s^2$

This can also be written as a decimal.

$a=0.4 \ m/s^2$

Her average acceleration during the last 5 seconds of the race is 2/5 or 0.4 meters per square second.

6 0

3 years ago

Read 2 more answers

What’s the formula for copper (I) phosphate

Anna11 [10]

The formula for copper (1) phosphate is Cu3PO4

3 0

3 years ago

Read 2 more answers

Would the size of an item affect whether or not it is flammable?

pochemuha

Answer:

No! It only depends on the chemicals in or on the object.

Explanation:

Hope this helped! :)

5 0

3 years ago