2 years ago

How do "rules" help scientists understand the world?

Chemistry

1 answer:

BaLLatris [955]2 years ago

4 0

Answer:

B.Scientists use rules to form their hypotheses.

Explanation:

<h2>I already know the answer because it is our lesson last quarter.</h2>

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A rock has a mass of 15 grams and a volume of 5 cm3. What is the density of the rock?

xz_007 [3.2K]

The answers is 3.0 g/cm^3

Explanation:
You use the formula
Density= mass/volume
When they give you mass and volume.

The mass is 15 grams and the volume would be 5 cm^3.

So the density would be
15/5= 3

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3 years ago

Quiz. Formula Weight and % Composition

astraxan [27]

Answer:

#1- the percentage is 2.77%

#2 - 218.1336g

#3- 7.89%

#4- 63.8489g

#5- 136.1406g

#6- 340.3515g

#7- 2.387238

#8-

Explanation:

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3 years ago

What two variables are needed to calculate molarity?

ludmilkaskok [199]

B. Moles of solute, liters of solution

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3 years ago

Caustic soda is 19.1 M NaOH and is diluted for household use. What is the household concentration if 10 mL of the concentrated s

olga nikolaevna [1]

Hello!

To calculate the household concentration of NaOH we need to use the dilution formula, clearing for M2, as you can see in the equation below:

$M1*V1=M2*V2 \\ \\ V2= \frac{M1*V1}{V2}$

Now, we input the values from the data we have onto this equation. M1=19,1 M; V1=10 mL; V2=400 mL, and solve the equation to get the result:

$V2= \frac{M1*V1}{V2}= \frac{19,1M*10mL}{400 mL}=0,48M$

So, the household concentration of NaOH will be 0,48 M

Have a nice day!

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4 years ago

Changing the number of _______ makes an atom stable or unstable and creates different isotopes of the same element with a differ

Bumek [7]

Changing the number of NEUTRONS makes an atom stable or unstable and creates different isotopes of the same element with a different ATOMIC MASS

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3 years ago