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3 years ago

Look at the picture below. Name the isotope

Chemistry

1 answer:

andrew11 [14]3 years ago

6 0

It is potassium 39 definately

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Which of the following is not true about compounds?

finlep [7]

Answer:

Elements can combine in any proportion to form a compound. -third choice

4 0

3 years ago

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When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 15.6 g of carbon were burned in the presence of

NeX [460]

Answer: 5.72 g mass of carbon dioxide was produced

Explanation:

$C+O_2\rightarrow CO_2$

Moles of C = $\frac{\text{mass of carbon}}{\text{molar mass of carbon}}=\frac{15.6 g}{12 g/mol}=1.3 moles$

Mass of $O_2$ reacted = 59.1 g - 17.5 g = 41.6 g

Moles of $O_2\text{ reacted}=\frac{\text{mass of}O_2}{\text{molar mass of}O_2}=\frac{41.6 g}{32 g/mol}=1.3 moles$

According to reaction 1 mole $O_2$ produces 1 mole of $CO_2$ then 1.3 mole of $O_2$ will produce $\frac{1}{1}\times 1.3$ moles of $CO_2$

Mass of $CO_2$ :

=Moles of $CO_2$ × molar mass of $CO_2$ = 1.3 ×44 g/mol =

=57.2 grams

5.72 g mass of carbon dioxide was produced

7 0

3 years ago

The most common form of elemental sulfur is S8, in which eight sulfur atoms linked in a ring of single bonds. At high temperatur

aliina [53]

Answer:

Explanation:

In S₈ , there are 8 single bonds which breaks up first . Energy absorbed

= 8 x 240 = 1920 kJ

In S₈ four double bonds of S₂ are formed . Let bond energy be x . In this process energy will be released . energy released in four S₂ molecules formed = 4 x

Given

1920 + 4x = 239

4x = 239 - 1920

x = - 420.25 kJ .

So bond energy of S₂ = 420.25 kJ .

8 0

3 years ago

How is "food" produced in ecosystems without sunlight?

NeX [460]

Answer:

A Chemosynthesis

Explanation:

5 0

3 years ago

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Consider the reaction 2AI(OH)3 + 3H2SO4 Right arrow. X + 6Y. What are X and Y? X = AI2(SO4)3; Y = H2O X = AI2(SO4)3; Y = H2 X =

Rom4ik [11]

Answer :

X = $Al_2(SO_4)_3$

Y = $H_2O$

Explanation :

Balanced chemical equation : It is defined as the equation in which total number of individual atoms on the reactant side is equal to the total number of individual atoms on product side.

The given chemical equation is:

$2Al(OH)_3+3H_2SO_4\rightarrow X+6Y$

As we know that when aluminum hydroxide react with sulfuric acid then it gives aluminum sulfate and water as product.

The balanced chemical reaction will be:

$2Al(OH)_3+3H_2SO_4\rightarrow Al_2(SO_4)_3+6H_2O$

Thus, X is $Al_2(SO_4)_3$ and Y is $H_2O$

4 0

3 years ago