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makkiz [27]
3 years ago
12

What are two ways that compounds are different from the elements that form them?

Chemistry
1 answer:
Serjik [45]3 years ago
8 0
<span>The chemical caharacteristics of the compound is different their corresponding elements. Eg. H2 - Combustible and O2 - Supporter of combustion BUT Their compound H2O is incombustible as it po...</span>
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If the temperature of the water an ice cube is placed in is ______________, then the ice cube will melt __________.
Anit [1.1K]

Answer:

I have no clue what is being asked in the second half of the question.  Is there some context from which the question is taken?

Explanation:

If the temperature of the water an ice cube is placed in is <u>___above 0°C__</u>, then the ice cube will melt <u>_unless you remove it??_________</u>.

8 0
3 years ago
Which of the following has a mass of 10.0 g?
Serjik [45]

Answer:

a.  0.119mol Kr

Explanation:

To solve this problem, we must understand that;

     Mass  = number of moles x molar mass

Molar mass of Kr  = 83.3g/mol

                        Ar = 40g/mol

                        He = 4g/mol

                        Ne = 20.18g/mol

a0.119 mol Kr               mass  = 0.119 x 83.3 = 9.9g

b 0.400 mol Ar             mass  = 0.4 x 40  = 16g

C 1.25 mol He               mass  = 1.25 x 4  = 5g

d 2.02 mol Ne              mass  = 2.02 x 20.18  = 40.8

Krypton is the answer

5 0
3 years ago
Can anyone help me do this crossword puzzle?
gulaghasi [49]
Download socratic it will help
7 0
3 years ago
A student decomposed 3.67g of copper (ii) hydroxide into copper (ii) oxide. how many ml of 3m h2so4 is need to react with all th
vredina [299]
In the presence of heat, copper (II) hydroxide decomposes in to copper (II) oxide. 
Cu(OH)₂ (s) ----> CuO (s) + H₂O (l)
upon decomposition, water is removed from Cu(OH)₂
the amount of Cu(OH)₂ decomposed - 3.67 g
number of moles of Cu(OH)₂  - 3.67 g / 97.5 g/mol = 0.038 mol
stoichiometry of Cu(OH)₂ to CuO is 1:1
therefore number of CuO moles formed are - 0.038 mol
CuO reacts with sulfuric acid to form CuSO₄ 
CuO + H₂SO₄ ---> CuSO₄ + H₂O
stoichiometry of CuO to H₂SO₄ is 1:1
therefore number of H₂SO₄ moles that should react is 0.038 mol
the molarity of H₂SO₄ is 3M
this means that in 1000 ml - 3 mol of H₂SO₄ present 
so if 3 mol are present in 1000 ml 
then volume for 0.038 mol = 1000/3 * 0.038 
                                           = 12.67 ml
6 0
3 years ago
A cube made of an unknown material has a height of 9 cm. The mass of this cube is 3,645 grams.
kvasek [131]

Answer:

v=9*9*9=729 ml

3645/729= 5g/cm 3

8 0
3 years ago
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