Direction is not important when describing an object's motion. O True False

Chemistry

2 answers:

skelet666 [1.2K]2 years ago

6 0

True it’s not important

mina [271]2 years ago

6 0

I believe ,,,,false

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The heat of fusion for a substance is 122 joules per gram. How many joules of heat are need to melt 7.50 grams of this substance

daser333 [38]

<h3>Answer:</h3>

915 Joules

<h3>Explanation:</h3>

The heat of fusion is the heat that is required to convert a given mass of a substance from solid state to liquid state without change in temperature.
In this case, we are given specific heat of a substance as 122 joules per gram
It means that amount of heat equivalent to 122 joules is required to change 1 gram of the substance from solid state to liquid state.

Therefore, we can determine the amount of heat needed to change 7.5 grams of the substance from solid to liquid state.

1 g = 122 Joules

7.5 g = ?

= 122 × 7.5

= 915 Joules

Thus, 7.5 g of the substance at its melting point will require 915 Joules of heat to melt.

4 0

3 years ago

Which pair of reactants will undergo aldol condensation to produce methylvinyl ketone?

xenn [34]

When formaldehyde and acetone then react with each other( aldol condensation) then it will be formed <u> methyl vinyl ketone.</u>

<u />

In organic chemistry, an aldol condensation would be a condensation reaction in which an enol and enolate ion combines with a carbonyl chemical to produce a -hydroxy aldehyde or -hydroxy ketone, that is then dehydrated to produce a conjugated enone.

In aldol condensation, when formaldehyde and acetone then react with each other then it will be formed <u> </u><u>methyl vinyl ketone.</u>

It can be written as

$CH_{2} O + CH_{3} COCH_{3}$ → $HOCH_{2} -CH_{2} -CO-CH_{3}$