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4 years ago

10

Pick a key concept that you understand well and explain it in a way that an elementary school student could understand.

1 answer:

Gwar [14]4 years ago

5 0

Colors!!
We know about all the colors in the rain bow but do you know how most of them are made?

Red and blue and yellow can make sooooo many different colors if you mix them together.

For example red + blue = purple! This is because red, blue and yellow are primary colors and these colors are colors that can make up other colors.

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A solution has a pH of 8.30. Determine the OH- concentration

Sophie [7]

Answer:

Explanation:

We know that

pH +pOH = 14

Given pH = 8.30

⇒ p0H = 14-8.30 = 5.70

Since, we know that

$10^{-pH} = [H^{+}]$

7 0

3 years ago

How many molecules are in 145 g of aluminum sulfate?

Rina8888 [55]

Answer:2.55 x 10^23 molecules

Explanation:

i had the same question for my class lol, do u go to forest park?

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3 years ago

A substance/object that reacts with Sodium is Physical or Chemical??

Anna35 [415]

Answer:

physical

Explanation:

it is physical because you add another chemical to the sodium

3 0

4 years ago

Few grapes are placed in a bowl filled with honey and left undisturbed for few hours. What can be observed in the grapes after f

Lorico [155]

Explanation:

Answer is

B , The grapes will burst

8 0

3 years ago

A 150 W electric heater operates for 12.0 min to heat an ideal gas in a cylinder. During this time, the gas expands from 3.00 L

Brut [27]

<u>Answer:</u> The change in internal energy of the gas is 108.835 kJ

<u>Explanation:</u>

To calculate the work done for reversible expansion process, we use the equation:

$W=P\Delta V=-P(V_2-V_1)$

where,

W = work done

P = pressure = 1.03 atm

$V_1$ = initial volume = 3.00 L

$V_2$ = final volume = 11.0 L

Putting values in above equation, we get:

$W=-(1.03)\times (11.0-3.00)=8.24L.atm=834.9J=0.835kJ$ (Conversion factor: 1 L. atm = 101.325 J)

Calculating the heat from power:

$Q=P\times t$

where,

Q = heat required

P = power = 150 W

t = time = 12 min = 720 s (Conversion factor: 1 min = 60 s)

Putting values in above equation:

$Q=150\times 720=108000J=108kJ$

The equation for first law of thermodynamics follows:

$Q=dU+W$

where,

Q = total amount of heat required = 108 kJ

dU = Change in internal energy = ?

W = work done = -0.835 kJ

Putting values in above equation, we get:

$108kJ=dU+(-0.835)\\\\dU=(108+0.835)=108.835kJ$

Hence, the change in internal energy of the gas is 108.835 kJ

7 0

4 years ago