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V125BC [204]
3 years ago
9

Is a push or a pull. A.FORCE B.MASS ???

Chemistry
1 answer:
Alex_Xolod [135]3 years ago
4 0
A.Force because your adding pressure to what you are pushing or pulling.
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An atom of aluminum in the ground state and an atom of gallium in the ground state have the same
Kobotan [32]
(4) total number of valence electrons, because they exist in the same group.
3 0
3 years ago
What will describe a particle having 26electron,39nutron,28proton?
Artemon [7]

Answer:

Iron has 26 electrons. Potassium has 39 neutrons. Nickel has 28 protons.

Explanation:

4 0
2 years ago
5. Uranium has three common isotopes. If the abundance of 2U which has an atomic mass of 233.878 amu is 0.01%, the
Temka [501]

Uranium has three common isotopes. The average atomic mass of uranium is 23.7 u/atom.

<h3>What are isotopes?</h3>

Isotopes are similar elements that have a different number of protons.

Uranium has three isotopes

The abundance of 2U has an atomic mass of 233.878 is 0.01%

The abundance of U has a mass of 234.892 amu is 0.71%

The **U has an atomic mass of 237.911 amu is 99.28%

Let's assume we have 10 000 atoms of Uranium

Mass of the 0.01 atoms = 0.01 x 233.878 = 2.33878

Mass of the 0.71 atoms =  0.71 x 234.892 = 166.773

Mass of the 99.28 atoms = 99.28 x 237.911 = 23,619.80

2.33878 + 166.773 + 23,619.80 = 23,788.8

23,788.8 / 1000 = 23.7 u/atom

Thus, the average atomic mass of uranium is 23.7 u/atom.

To learn more about average atomic mass, refer to the link:

brainly.com/question/12971445

#SPJ1

4 0
1 year ago
List 2 of the important properties of gases.
sukhopar [10]
Gasses are easy to compress
And they expand to fill their containers
8 0
3 years ago
Read 2 more answers
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
Read 2 more answers
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