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2 years ago

If an object does Not explode, catch fire, or dissolve, how would you describe this object? (Three answers)

Chemistry

1 answer:

yaroslaw [1]2 years ago

3 0

Non-combustible

eg:-glass,water,stone, Portland cement etc ...

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How many grams are in 0.50 moles of water

adell [148]

Answer:

9.01 grams

Explanation:

~18.02 grams are in 1 mole of water so you'd divide that in half to get 9.01 grams.

6 0

2 years ago

A) 2Fe(s) + O2(g) =>

TiliK225 [7]

Answer: -22.2 kJ

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps. SGDSDGSDGSDGgsg

According to Hess’s law, the chemical equation can be treated as algebraic expressions and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

(1) $2Fe(s)+O_2(g)\rightarrow 2FeO(s)$ $\Delta H_1=-544.0kJ$

(2) $4Fe(s)+O_2(g)\rightarrow 2Fe_2O_3(s)$ $\Delta H_2=-1648.4kJ$

(3) $Fe_3O_4(s)\rightarrow 3Fe(s)+2O_2(g)$ $\Delta H=+1118.4kJ$

Reversing 1 ,2 and 3 and halving 1 and 2 and then adding we get net equation:

(4) $Fe_2O_3(s)+FeO(s)\rightarrow Fe_3O_4(s)$ $\Delta H_4=?$

$\Delta H_4=\frac{-\Delta H_1}{2}+\frac{-\Delta H_2}{2}+(-\Delta H_3)=\frac{544.0}{2}+\frac{1648.4}{2}+(-1118.4)=-22.2kJ$

Therefore, the heat of reaction, ΔH, for the reaction is -22.2 kJ

6 0

3 years ago

1. H2SO4, sulfuric acid, contains three different types of atoms: hydrogen (H), sulfur (S), and oxygen (O). Each of these atoms

sammy [17]

Answer:

The blanks can be completed with words in the following sequence

1) elements

compound

2) atom

3) matter

4) compound

5) chemistry

6) reactants

product

Explanation:

In H2SO4, atoms of hydrogen, sulphur and oxygen represent different elements that are combined to form the compound.

The smallest indivisible unit of matter that still retains all the properties of matter is an atom. Matter is anything that has weight and occupy space.

Atoms combine in fixed ratios to form compounds. Chemistry studies matter scientifically and pays specific attention to the changes that matter undergoes.

Considering the reaction of photosynthesis, water and carbon dioxide combine to give glucose so the water and carbon dioxide are reactants while the glucose is the product of the reaction.

8 0

3 years ago

The contents of a Helium ballon are in which phase? A. Solid B. Plasma C. Liquid G. Gas

cluponka [151]

Helium is stable compound. exists in gaseous state. the answer is gas

6 0

4 years ago

What is the synthetic element in period 5

zmey [24]

Answer:

Technetium

Explanation:

8 0

2 years ago

If an object does Not explode, catch fire, or dissolve, how would you describe this object? (Three answers)​

If an object does Not explode, catch fire, or dissolve, how would you describe this object? (Three answers)