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2 years ago

Significant figures

Chemistry

1 answer:

stira [4]2 years ago

8 0

Answer:

a) 1.6

f)7.51

b)3.9

g)9.2

c)3.1

h)41.9

d)1.959

i)0.29

e)5.2

j)1.112

Explanation:

When you are multiplying or dividing the numbers you take the least amount of significant figures and that's how many significant figures your answer will be. Instead of being a super long answer. Hope this helps. Also, sorry it took me a hot minute :)

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A gas with a volume of 250 mL at a temperature of 293K is heated to 324K. What is the new volume of the gas?

Natalija [7]

Answer:

The new volume of the gas is 276.45 mL.

Explanation:

Charles's law indicates that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases.

Charles's law is a law that mathematically says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:

$\frac{V}{T} =k$

Analyzing an initial state 1 and a final state 2, it is satisfied:

$\frac{V1}{T1} =\frac{V2}{T2}$

In this case:

V1= 250 mL
T1= 293 K
V2= ?
T2= 324 K

Replacing:

$\frac{250 mL}{293 K} =\frac{V2}{324 K}$

Solving:

$V2=324 K*\frac{250 mL}{293 K}$

V2= 276.45 mL

<em><u>The new volume of the gas is 276.45 mL.</u></em>

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3 years ago

calculate the volume of carbon dioxide of room temperature and pressure obtained from 30 grams of glucose

ivanzaharov [21]

Answer:

Explanation:

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3 years ago

T/F___ At the eutectic composition, an alloy can solidify at a constant temperature.___ For effective dispersion strengthening,

azamat

Answer:

TRUE
FALSE
TRUE
FALSE
FALSE
TRUE

Explanation:

At the eutectic composition, an alloy can solidify at a constant temperature : TRUE . this is because at eutectic composition the type of reaction that takes place there is invariant reaction in its thermal equilibrium
For effective dispersion strengthening, the dispersed phase should be needle-like, as opposed to round : FALSE. because the rounded shape will not cause a crack.
Intermetallic compounds are usually hard and brittle : TRUE. because Intermetallic compounds prevents dislocation movements and this makes them brittle and hard
For the effective dispersion and strengthening, the dispersed phase should be continuous : FALSE. this is because the dispersed precipitate must be small and not continuous
Stoichiometric intermetallic compounds exist over a range of compositions : FALSE
Faster solidification results in smaller interlamellar spacing : TRUE

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3 years ago

Choose the description that matches the law of included fragments.

GREYUIT [131]

Answer:

The answer is B

Explanation:

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2 years ago

Choose the statement below that is correct for gas particles according to KMT.

rewona [7]

Answer:

2.At a given temperature, the KE of all gases is the same.KE depends only on Kelvin temperature

Explanation:

The kinetic molecular theory of gases provides a succint expalantion and insight into the behaviour of gases. The assumptions of the theory are stated below:

Gases are made up of large number of identical molecules which are moving at different speeds.
Spaces occupied by molecules of gases are negligible compared to the volume of the container.
Molecules of gases are independent of one another.
The molecules collide with themselves and the walls of the container elastically.
The temperature of a gas is a measure of only the average kinetic energy of the molecules.

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3 years ago