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Nataly_w [17]
3 years ago
9

Help me answer all it's for science

Chemistry
2 answers:
Inga [223]3 years ago
6 0
Number four and number five are true 
Nadusha1986 [10]3 years ago
3 0
1. evaporation
2 condensation
3 sublimation
4 t
5 f 
6t
7 f
8 f

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Pure hydrogen (H₂) is a hazardous substance. Thus, safer and more cost effective techniques have been developed to store it as a
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Answer: hello your question has some missing details attached below is the missing details

answer : 25.5%  ( B )

Explanation:

<u>Determine percentage yield </u>

molar mass = 35 g/mol

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product  LiH(s) = 8.0 g ( actual yield )

theoretical yield ( LiH ) =  4 * 7.95  = 31.8 g

percentage yield = actual yield * 100 / theoretical yield

                            = 8 * 100/31.8

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3 years ago
6.) Choose all of the following that are TRUE regarding the Ideal Gas Law.
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Answer:

<em><u>All temperatures must be in </u></em><em><u>Kelvins</u></em><em><u>.</u></em>

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4 0
3 years ago
Compare the number of valence electrons in an atom of oxygen, o, with the number of valence electrons in an atom of selenium, se
Fiesta28 [93]
Oxygen and selenium both have 6 valence electrons. They're in the same group hope this helps
4 0
3 years ago
What is the relative formula mass of N2O? Ar of N = 14 and Ar of O = 16.
s2008m [1.1K]

We have to calculate formula mass of N₂O.

The answer is: 44

Relative formula mass is the sum of relative atomic mass of constituent atoms in a formula unit of any compound.  Relative formula mass is represented as same symbol of relative molecular mass.

To calculate relative formula mass we need to know number of each atom in the formula and then adding atomic masses of all the atoms.

In N₂O, number of N-atom present is equal to 2 and number of O-atom is equal to  1.

Atomic mass of N-atom is 14 and atomic mass of O-atom is 16.

So, formula mass of N₂O is (2 X 14)+16 = 44.

6 0
3 years ago
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