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4 years ago

melting, boiling, and bending are considered physical changes, but burning is a chemical change. explain why this is so.

1 answer:

8 0

<span>So, when you make something boiling or melting, its still the same substance. Water doesn't change into something else, just change its state of matter. When you burn something, one substance reacts with another. For example, when you burn carbon in oxygen, you get carbon dioxide. That's the difference.</span>

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The temperature of a 350. mL sample of gas increases from 27 °C to 227 °C. What is the final volume of the sample of gas, if the

Liono4ka [1.6K]

Answer:

$V_2=583.3mL$

Explanation:

Hello,

In this case, for the given constant amount and pressure of the, we apply the Charles' law which allows us to understand the volume-pressure behavior as a directly proportional relationship:

$\frac{V_1}{T_1} =\frac{V_2}{T_2}$

Thus, since we need to compute the volume after the temperature increase (which must be expressed in absolute Kelvins), we obtain V2 as:

$V_2=\frac{V_1T_2}{T_1} =\frac{350.0mL*(227+273.15)K}{(27+273.15)K}\\ \\V_2=583.3mL$

Best regards.

5 0

4 years ago

When dissolving a solid, what happens to the rate of dissolution while stirring the solution

emmasim [6.3K]

The rate of dissolution simply tells us how fast or slow a given solute will dissolve in a particular solvent. There are four main factors that affect this rate: temperature, stirring, area of contact, and saturation.

6 0

3 years ago

Which expression is equal to the number of grams (g) in 2.43 kilograms (kg)?

ollegr [7]

Answer:

2430 g

Step-by-step explanation:

1000 g = 1 kg

2.43 kg = 2.43 kg × (1000g/1 kg)

= 2430 g

6 0

3 years ago

Read 2 more answers

A chemist can determine the mass of K in a sample of known mass that consists of either pure K2O or pure K2O2. From this informa

Arte-miy333 [17]

Yes , the chemist can answer if the compound in K2O or K2O2

The chemical formula and composition of both the compounds is entirely different. The compound K2O2 has an additional molecule of oxygen than K2O and hence will have have higher molecular mass.

In the compound K2O

molecular mass= 2x 39+16 =94

mass ratio of K in compound= 78/94 = 0.830

In the compound K2O2

molecular mass= 2x 39+16X2 =110

mass ratio of K in compound= 78/110 = 0.710

and hence by the required ratio while extracting K , the chemist may know if the compound is K20 or K2O2

If the ratio is anything different from 0.830 and 0.710 then the compund will be something different

#SPJ9

5 0

2 years ago

40.002 g : 13.000005 g =

kolbaska11 [484]

I believe that this is the answer 520.03 g

6 0

4 years ago