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SCORPION-xisa [38]
3 years ago
9

Explain why oxygen has a higher ionization energy than phosphorus

Chemistry
1 answer:
muminat3 years ago
8 0
Because it is less stable than phosphorous
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Why is burning wood a chemical change?
Nitella [24]
There are 4 things that are evidence of a chemical change.
1)Change in color
2)Change in shape (gas being let out)
3)Change in temperature
4)Change in smell

Burning wood is a chemical change because it has a change in color, and shape.
3 0
3 years ago
Which statement is true?
AleksandrR [38]

Exothermic reaction is where there is release of energy during a reaction

The enthalpy of exothermic reaction is negative

The relation between energy of products, reactants and enthalpy of reaction is

Enthalpy of reaction =  sum of enthalpy of formation of products - sum of enthalpy of formation of reactants .

As enthalpy of reaction is negative, it means the enthalpy of products is less than the enthalpy of reactants  so answer is :

In an exothermic reaction the energy of the product is less than the energy of the reactants.

7 0
3 years ago
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How much sodium bicarbonate to raise alkalinity in pool.
almond37 [142]

Answer:

A rule of thumb is that 1.5 lbs. of baking soda per 10,000 gallons of water will raise alkalinity by about 10 ppm. If your pool's pH is tested below 7.2, add 3-4 pounds of baking soda. If you're new to adding pool chemicals, start by adding only one-half or three-fourths of the recommended amount.

4 0
1 year ago
What is the # of Electrons in carbon?
Feliz [49]

Answer:

Carbon dioxide (CO2)

Ethene (C2H4)

Methane (CH4)

Explanation:

5 0
3 years ago
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Which statement about Delta.Hf is true?
Novay_Z [31]

Answer:

  • <u><em>It is positive when the bonds of the product store more energy than those of the reactants.</em></u> (the second statement)

Explanation:

ΔHf is the change of enthalpy during the reaction, which is equal to the sum of enthaply  changes of the products less the sum of the enthalpy changes of the reactants.

  • ΔHf = ∑ (ΔH products)  - ∑ (ΔH reactants)

  • ΔHf = ΔH rxn

Also, ΔHrxn, per definition, is the potential chemical energy stored in the bonds of the products less the chemical potential energy stored in the bonds of the reactants.

Then, when the potential chemical energy stored in the bonds of the products is greater than the chemical potential energy stored in the bonds of the reactants ΔHrxn is positive.

Hence, you conclude that ΔHf is positive when the bonds of the product store more energy than those of the reactants (second statement from the choices).

Some brief comments about the other statements:

  • The standard enthalpy of formation, ΔHf, is zero for an element in its standard state, not for a compound.

  • For a compound the enthalpy of formation at 25ºC and 1 atm (the standard state) may be positive or negative.

  • Also, note that the standard state for any element is not liquid: some are solids, some are gases, and some are liquids at 25ºC and 1 atm.

3 0
3 years ago
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