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3 years ago

Which procedure could a student use to examine an intensive property of a rectangular block of wood?

Chemistry

1 answer:

PolarNik [594]3 years ago

7 0

The formula they can use is Length multiplied by Width Multiplied by Height

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Is the following hypothesis testable? "If I study, I will get a better grade on a test than if I do not study."

Fudgin [204]

Answer:

Yes

Explanation:

Yes, you can test this by comparing grades you received when you studied and when you did not study

4 0

3 years ago

Carbon disulfide is prepared by heating sulfur and charcoal. The chemical equation is S2(g)+C(s)↽−−⇀CS2(g)????c=9.40 at 900 K Ho

Maru [420]

Answer : The mass of $CS_2$ is, 555.028 grams

Explanation :

First er have to calculate the concentration of $S_2$ .

$\text{Concentration of }S_2=\frac{\text{Moles of }S_2}{\text{Volume of solution}}=\frac{8.08mole}{5.35L}=1.51mole/L$

Now we have to calculate the concentration of $CS_2$ .

The given balanced chemical reaction is,

$S_2(g)+C(s)\rightleftharpoons CS_2(g)$

Initial conc. 1.51 0 0

At eqm. conc. (1.51-x) (x) (x)

The expression for equilibrium constant for this reaction will be,

$K_c=\frac{[CS_2]}{[S_2]}$

Now put all the given values in this expression, we get :

$9.40=\frac{x}{(1.51-x)}$

By solving the term 'x', we get :

x = 1.365 M

Concentration of $CS_2$ = x M = 1.365 M

Now we have to calculate the moles of $CS_2$ .

$\text{Moles of }CS_2=\text{Concentration of }CS_2}\times \text{Volume of solution}=1.365mole/L\times 5.35L=7.303mole$

Now we have to calculate the mass of $CS_2$ .

Molar mass of $CS_2$ = 76 g/mole

$\text{Mass of }CS_2=\text{Moles of }CS_2}\times \text{molar mass of }CS_2}=7.303mole\times 76g/mole=555.028g$

Therefore, the mass of $CS_2$ is, 555.028 grams

3 0

4 years ago

Plz help me i swear will mark you brainiest :(

vladimir1956 [14]

Answer:

C. the relative molecular mass of the compound

Explanation:

Like molecular formulas, empirical formulas are not unique and can describe a number of different chemical structures or isomers. <u>To determine an empirical formula, the relative molecular mass of the composition of its elements</u> can be used to mathematically determine their ratio.

7 0

3 years ago

How did Wegener use fossils as evidence that continents had moved?

Anna35 [415]

Answer:

the fossils on some of the continents were in the same spots as fossils on other continents

Explanation:

tell me if i need to explain more. x

4 0

3 years ago

A solution has an H3O+ concentration of 3.5 x 10^-5 M. Is it acidic or basic?

irakobra [83]

The mass of NaCl produced is 0.117 g.

The pH of a solution is what tells us if the solution is acidic or basic. The solution is acidic if the pH of the solution is less than 7.

1) pH = - log(3.5 x 10^-5 M)

= 4.45

Thus the solution is acidic.

2) We can see that the concentration as given is the concentration of OH^-

[OH ] = 4.0 x 10^-3 M

pOH = -log (4.0 x 10^-3 M)

pOH = 2.39

pH = 14 - 2.39

pH = 11.61

The equation of the reaction is; $NaOH + HCl ----- > NaCl + H2O$

Number of moles of NaOH = 0.40 M * 10/1000 = 0.004 moles

Number of moles of HCl = 0.20 M * 10/1000 = 0.002 moles

We can see that HCl is the limiting reactant

Mass of NaCl produced ;

0.002 moles * 58.5 g/mol = 0.117 g

Learn more about reaction:brainly.com/question/3588292

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7 0

2 years ago