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3 years ago

Density is not a physical property of mass. True False

Chemistry

2 answers:

Yakvenalex [24]3 years ago

7 0

I think it's false but don't be mad if it's not right

SIZIF [17.4K]3 years ago

6 0

True it is not a physical property of mass .

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hich quantity describes how spread out a set of data is? O A. Standard deviation O B. Percent error O C. Line of best fit D. Mea

juin [17]

The answer to this is B.

6 0

3 years ago

A chemist must prepare 800.0mL of sodium hydroxide solution with a pH of 12.10 at 25°C. She will do this in three steps: Fill a

AnnZ [28]

Answer:

0.42 g

Explanation:

We have:

pH = 12.10 (25 °C)

V = 800.0 mL = 0.800 L

To find the mass of sodium hydroxide (NaOH) we can use the pH:

$14 = pH + pOH$

$pOH = 14 - pH = 14 - 12.10 = 1.90$

$pOH = -log ([OH^{-}])$

$[OH]^{-} = 10^{-pOH} = 10^{-1.90} = 0.013 M$

Now, we can find the number of moles (η) of OH:

$\eta = ([OH]^{-})*V = 0.013 mol/L * 0.800 L = 1.04 \cdot 10^{-2} moles$

Since we have 1 mol of OH in 1 mol of NaOH, the number of moles of NaOH is equal to 1.04x10⁻² moles.

Finally, with the number of moles we can find the mass of NaOH:

$m = \eta * M$

Where M is the molar mass of NaOH = 39.9 g/mol

$m = 1.04 \cdot 10^{-2} moles * 39.9 g/mol = 0.42 g$

Therefore, the mass of sodium hydroxide that the chemist must weigh out in the second step is 0.42 g.

I hope it helps you!

3 0

3 years ago

PLEASE HELP:

klio [65]

Answer:

Oil spills

Explanation:

I've done it before

5 0

3 years ago

It takes 1 kcal to raise the temperature of 1 kg of liquid water by 1 C, but only 0.5 kcal to raise the temperature of 1 kg of i

belka [17]

Answer:

a. 50KCal

b. 400KCal

c. Same as (a) above

Explanation:

Given

To raise the temperature of 1kg of liquid water at 1°C requires 1KCal

To raise the temperature of 1kg of ice or water vapour by 1°C requires 0.5KCal

To melt 1kg of ice at 0°C requires 80KCal

To evaporate 1kg of liquid water sitting at 100°C requires 540KCal

a. How much heat is required to raise the temperature of 5 kg of liquid water by 20 C?

To raise the temperature of 5 kg of ice by 20°C requires:

5 kg * (0.5 kcal / kgC) * 20C

= 50 KCal

b. How much heat is required to melt 5 kg of ice at 0 C?

To melt an ice of 5 kg of ice at 0 C requires:

5 kg * (80 kcal / kg)

= 400 KCal

c. Same as (a) above

6 0

2 years ago

How does diffusion enable you to smell food cooking in another room

monitta

movement of particles from a high concentration to a low concentration until they are spread out evenly.

6 0

3 years ago