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3 years ago

Give the nuclear symbol for the isotope of phosphorus for which a=31? enter the nuclear symbol for the isotope (e.g., 42he).

1 answer:

8 0

A = number of mass = 31 => number of protons + number of neutrons = 31

Phosphours, Z = atomic number = 15 = number of protons

Symbol of the element phosphorus = P

=> The symbol of the isotope is the symbol of the element, P, with the number of mass, 31, to the left, as a superscript, and the atomic number, 15, to the left, as a suscript.

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Which element is classified as a noble gas?

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Answer:

Noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og)

Explanation:

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3 years ago

If a solution has a concentration of 12 M when the volume is 150 mL. What is the new concentration if you increase the volume to

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The idea with diluting a solution is that the number of moles of solute will remain constant after the initial solution is diluted. The only ...

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2 years ago

Definition: This is an acid that does not dissociate 100% into its ions. HA<-> H+ + A-

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Answer: Weak Acid

Explanation: I took this on USATESTPREP.

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3 years ago

Julissa combined baking soda and calcium chloride solution in a beaker. she observed bubbling and a white solid formed. Julissa

Mamont248 [21]

Answer:

Explanation:

With chemical reactions, there are various factors that affect the rate of the reaction. One of these is temperature.

When you raise the temperature, the reaction will move faster. Why? Temperature is directly correlated with the kinetic energy (basically, the energy that makes the particles move). Higher temperatures mean higher kinetic energies. Particles with higher kinetic energies move faster, which makes them more likely to collide. When collisions occur more frequently, the reaction follows through more quickly.

Thus, when Julissa warms the solutions, she will see that bubbling and white solid formation (the products of the reaction) occus faster. So, the answer is A.

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3 0

3 years ago

Write an equilibrium expression for each chemical equation involving one or more solid or liquid reactants or products.

Alex_Xolod [135]

Answer:

$Keq=\frac{[HCO_3^-][OH^-]}{[CO_3^{2-}]}$

$Keq=[O_2]^3$

$Keq=\frac{[H_3O^+][F^-]}{[HF]}$

$Keq=\frac{[NH_4^+][OH^-]}{[NH_3]}$

Explanation:

Hello there!

In this case, for the attached reactions, it turns out possible for us to write the equilibrium expressions by knowing any liquid or solid would be not-included in the equilibrium expression as shown below, with the general form products/reactants:

$Keq=\frac{[HCO_3^-][OH^-]}{[CO_3^{2-}]}$

$Keq=[O_2]^3$

$Keq=\frac{[H_3O^+][F^-]}{[HF]}$

$Keq=\frac{[NH_4^+][OH^-]}{[NH_3]}$

Regards!

5 0

2 years ago