2 years ago

A physical change involves a change in the identity o the sample. O True O False

Chemistry

1 answer:

s344n2d4d5 [400]2 years ago

4 0

It is true because it changes the identity of a persin or a character

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Does the model below represent a mixture or a substance ?

Vikentia [17]

Answer:

substance

Explanation:

A mixture is when two or more <u>different</u> atoms/molecules are together, but not joined.

A substance is when the <u>same </u>atom/molecule is in a group together.

In this example, it is a substance because it is comprised of the same molecule not joined all together. If you wanted a mixture, other colored atoms/molecule (e.g. add green atoms) would change it to this property.

4 0

3 years ago

Which air masses would have warm, moist air?

pochemuha

The air mass that would have warm, moist air would be a maritime tropical air mass:)

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4 years ago

Suppose a snack bar is burned in a calorimeter and heats 2,000 g water by 20 °C. How much heat energy was released?

prohojiy [21]

Heat energy released : 167.2 kJ

<h3>Further explanation</h3>

Heat can be calculated using the formula:

Q = mc∆T

Q = heat, J

m = mass, g

c = specific heat, joules / g ° C

∆T = temperature difference, ° C / K

m = 2000 g

c = 4.18 J/ g ° C

∆t = 20 ° C

$\tt Q=2000\times 4.18\times 20\\\\Q=167200~J=167.2~kJ$

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3 years ago

Draw the mechanism arrows for both propagation steps for the radical addition of HBr to the alkene. When drawing single-headed r

Vitek1552 [10]

Answer:

See the attached file for the structure

Explanation:

See the attached file for the explanation

7 0

3 years ago

Using the data in the table, calculate the rate constant of this reaction.

masha68 [24]

Answer:

xsahbx

Explanation:

s axnzcxs

8 0

3 years ago