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Tju [1.3M]
3 years ago
11

I need help plz and thank you❤

Physics
1 answer:
anzhelika [568]3 years ago
6 0
I think:
In motion- 40
Not moving- 20
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A student is told to use 20.0 g of sodium chloride to make an aqueous solution that has a concentration of 10.0 g/L (grams of so
Stells [14]

Answer:

she should add solute to the solvent

Explanation:

Given data :

Mass of the sodium chloride, = 20.0 g

Concentration of the solution = 10 g/L

Volume of 20.0 g of sodium chloride = 7.50 mL

Now, from the concentration, we can conclude that for 10 g of sodium chloride volume of the solution is 1 L

thus, for 20 g of sodium chloride  volume of the solution is 2 L or 2000 mL

also,

Volume of solution = Volume of solute(sodium chloride) + volume of solvent (water)

thus,

2000 mL = 7.5 mL + volume of solvent (water)

or

volume of water = (2000 - 7.5) mL

or

volume of water = 1992.5 mL

or

volume of water = 199.25 L ≈ 199 L

6 0
3 years ago
Read 2 more answers
An unknown amount of a radioactive isotope with a half-life of 2.0 h was observed for 6.0 h. if the amount of the isotope remain
Grace [21]

The original amount of the radioactive isotope will be 8 grams.

<h3 /><h3>What is the half-life of radioisotopes?</h3>

The amount of time required for half of a radioisotope's nuclide to decay, or change into a different species, is known as its half-life. The conversions release either beta or alpha particles, and the response can be monitored by counting the particles released.

Given that an unknown amount of a radioactive isotope with a half-life of 2.0 h was observed for 6.0 h. if the amount of the isotope remaining after 6.0 h was 24 g.

The original amount will be calculated as below:-

( 2 / 6 ) = ( Original amount / 24 )

Original amount = 4 x 2

Original amount = 8 grams

Therefore, the original amount of the radioactive isotope will be 8 grams.

To know more about the half-life of radioisotopes follow

brainly.com/question/1783783

#SPJ4

5 0
2 years ago
Which of Newton's laws of motion describes the motion of an object that has a net<br> force of ON?
algol [13]

Newton's first and second laws of motion both do, but I think the one you're looking for is: <em>The First Law of Motion</em>.  That description is a little more direct.

It says that if an object is not acted on by a net external force, then it continues in "constant, uniform motion".

3 0
3 years ago
Match the traits to the ogransims
k0ka [10]
Need more than that to answer this question
4 0
3 years ago
On a cold day, the speed of sound in air is 330 m/s. A note with a frequency of 1,320 Hz is played on an instrument. What is the
solmaris [256]

As we know that speed of sound is

v = 330 m/s

frequency of sound  is

f= 1320 Hz

now we know that frequency of sound and speed of sound is related to each other by the following formula

speed = frequency * wavelength

v = \lambda * f

330 = 1320 * \lambda

\lambda = 0.25 m

<em>so wavelength of sound is 25 cm or 0.25 m</em>

9 0
3 years ago
Read 2 more answers
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