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3 years ago

True or False: A chemical formula is a representation of the smallest unit of a compound

Chemistry

2 answers:

lisov135 [29]3 years ago

6 0

I think the answer would be true

jarptica [38.1K]3 years ago

3 0

The answer to you're question is:

~True.

Have a great day!!!

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Match the following associations. Exothermic or endothermic

Alekssandra [29.7K]

Answer:

1) ∆H is positive $\Rightarrow$ Endothermic

2) $E_p>E_r$ $\Rightarrow$ Endothermic

3) Energy is absorbed $\Rightarrow$ Endothermic

4) $E_r>E_p$ $\Rightarrow$ Exothermic

5) ∆H is negtive $\Rightarrow$ Exothermic

Explanation:

∆H is called as enthalpy change

It is also called as Heat of reaction

Energy is required for the bond to break a bond.

Energy is released when a bond is formed.

$H_2+Cl_2>2HCl$

that is

$H-H+Cl-Cl>2H-Cl$

We see in this equation, bonds between hydrogen and chlorine molecules gets broken and on the right side bond is formed in HCl.

If energy of products greater than energy of reactants then the reaction enthalpy change is endothermic .

If energy of products lesser than energy of reactants then the reaction enthalpy change is exothermic .

For example

$\Delta H=E_p-E_r$

$=30KJ-20KJ$

$=+10KJ$

(positive hence endothermic)

$\Delta H=E_p-E_r$

$=10KJ-40KJ$

$=-30KJ$

(negative hence exothermic)

8 0

3 years ago

Use the periodic table to find the molar mass of each of the following elements. Sodium (Na): g/mol Oxygen (O): g/mol Carbon (C)

ruslelena [56]

The Molar mass of an atom corresponds directly with its atomic mass on the periodic table.

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3 years ago

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When the weather change and temperatures get hot what do wolves use to cool down

shusha [124]

When the seasons change from winter to spring, the wolves inner layer of fur, which traps air and insulates the wolf from harsh cold temperatures, is shed to keep the wolf cool when the heat starts to come back.

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What properties of a substance determine how that substance will react when combined with other substances

Semmy [17]

Answer:

Chemical Properties

Explanation:

Chemical properties are properties that are observed during chemical reactions. Some examples of chemical properties are reactivity, flammability and chemical stability.

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3 years ago

When Luis burns wood in a campfire, the particles in the wood break down and energy is released. What type of energy does the wo

matrenka [14]

Answer:

chemical energy is stored in the wood before combustion.

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3 years ago