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2 years ago

During physical changes ,matter always retains its

Chemistry

1 answer:

svlad2 [7]2 years ago

7 0

During physical changes, matter always retains its chemical properties.

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A pure substance that is present before a reaction but not after Super Confused

never [62]

Explanation:

Pure subsance is a substance that is made up of only one type of particle - each piece is the same throughout.

Being present before the reaction but not after means it's no the same (it couldve evaporated)

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3 years ago

Which of these will reflect light with the highest frequency?

Ronch [10]

Answer:

the correct answer is an Orange baseball.

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2 years ago

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Lilit [14]

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2 years ago

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What is the specific heat capacity of an unknown metal if 75.00 g of the metal absorbs 418.6J of heat and the temperature rises

EleoNora [17]

Answer:

The specific heat capacity of the unknown metal is 0.223 $\frac{J}{g*C}$

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Q= 418.6 J
c= ?
m= 75 g
ΔT= 25 C

Replacing:

418.6 J= c* 75 g* 25 C

Solving:

$c=\frac{418.6 J}{75 g*25 C}$

c= 0.223 $\frac{J}{g*C}$

The specific heat capacity of the unknown metal is 0.223 $\frac{J}{g*C}$

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2 years ago

Pleaseee helpppp!!!!!!!!

Katarina [22]

Answer:

a covalent would be the two that are nonmetals

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3 years ago