3 years ago

The heat of fusion of water is 80 cal/ g. How much energy is needed to melt 0.05 kg of ice?

1 answer:

7 0

80 cal/ g is same as 80 calories in each 1 gram. so,

80 cal= 1 gram

first, we need to convert the kg into grams. all you have to do is multiply by 1000 or move the decimal three times to the right.

0.05 kg= 50.0 grams

50.0 g (80 cal/ 1 gram)= 4000 calories

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Many elements combine with hydrogen(valence = 1) to give compounds called hydrides. Use the position of an element in the period

elena-s [515]

Answer:

Explanation:

Use the position of an element in the periodic table to deduce its valence.

The periodic table is a table that groups elements based on their periodic functions. A group is a vertical arrangement of elements. The group number shows the number of elements in the outer shell of the atoms.

The groups runs from 1 to 8. On the periodic table, elements that has more than 4 electrons in their outermost shell will have a valency of 8 less than the number of outermost electrons.

Write formulas for these hydrides without using subscripts, for example XH3. If no hydride forms, write "none".

for group I : NaH, KH,

group II : MgH2, CaH2,

group III: BH3, AlH3

Group 8 do not form hydrides because of their inertness.

What is the formula of the hydride formed by sulfur?

the hydride of sulfur is H₂S

What is the formula of the hydride formed by potassium ?

the hydride of potassium is KH

3 0

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