How does the nucleus of a copper atom compared to the nucleus of a nickel atom

Answers

Answer 1

Answer: Copper has 29 protons in the nucleus, while Nickel has 28 protons.

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A solution has a [OH-] = 8.6 x 10-5. Answer the following questions.

pOH =
pH =
[H+] =

Answers

Answer: pOH= 4.06

pH= 9.94

$[H^+]=1.14* 10^(-10)M$

Explanation: pOH is the negative logarithm of $OH^-$ concentration.

pH is the negative logarithm of $H^+$ concentration.

$pOH=-log[OH^-]$

$pOH=-log[8.6* 10^(-5)]=4.06$

2) $pH+pOH=14$

$pH=14-4.06$

$pH=9.94$

3) $pH=-log[H^+]$

$9.94=-log[H^+]$

$[H^+]=1.14* 10^(-10)M$

pOH = 4
pH = 10
[H+] = 1 X 10^-10

What do elements and compounds have in common? And how do they differ?I will mark brainliest for the best answer.

WARNING: DON'T PUT LINKS I WILL REPORT YOU!

Answers

elements and compounds might appear different, yet they share many similarities, like being made up of atoms and having bonds linking their atoms together. Elements and compounds also share the qualities of being both pure and homogeneous substances. Substances can be categorised as either elements or compounds. Both of these are made up of atoms, the only difference is an element is made of one type of atom whereas compounds are made of two or more different types of atoms.

Watch the animation and observe the titration process of a standard 0.100 M sodium hydroxide solution with 50.0 mL of a 0.100 M hydrochloric acid solution. Identify which of the following statements regarding acid-base titration are correct. A. The pH of the solution at the equivalence point is 7.
B. At the end point, the pH of the solution is 10 and the color of the solution is pink.
C. Before any base is added to the solution, the pH of the solution is 10.
D. The pH of the solution changes very slowly at the equivalence point.
E. At the beginning of the titration process, the pH of the solution increases rapidly.
F. The chemical reaction involved in an acid-base titration is a neutralization reaction.

Answers

Answer

The chemical reaction involved in an acid-base titration is a neutralization reaction.

Explanation:

Final answer:

In this acid-base titration, only statements A and F are correct. At the equivalence point, the pH is 7, and the chemical reaction is a neutralization reaction. Other statements are false for different reasons.

Explanation:

In an acid-base titration process, the goal is to determine the concentration of an unknown acid or base by neutralizing it with an acid or base of a known concentration. This involved process is a neutralization reaction. Here are a few details:

A: The pH of the solution at the equivalence point is 7. This is correct. When a strong acid like hydrochloric acid is titrated with a strong base like sodium hydroxide, the equivalence point occurs at a pH of 7.
B: At the end point, the pH of the solution is 10 and the color of the solution is pink. This is incorrect. The end point will be when the solution is neutral (pH 7) assuming an appropriate indicator is used. The pink color indicates the presence of the base in excess.
C: Before any base is added to the solution, the pH of the solution is 10. This is incorrect. Before the base is added, the solution is acidic and has a pH less than 7.
D: The pH of the solution changes very slowly at the equivalence point. This is incorrect. The pH changes rapidly around the equivalence point due to the equal amounts of acid and base neutralizing each other.
E: At the beginning of the titration process, the pH of the solution increases rapidly. This is incorrect. At the beginning, the pH changes slowly until near the equivalence point where it changes rapidly.
F: The chemical reaction involved in an acid-base titration is a neutralization reaction. This is correct. The reaction between an acid and a base in a titration process is indeed a neutralization reaction which results in a salt and water.

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A 7.0 liter balloon at room temperature contains helium gas. if the temperature is halved, what happen to the volume?

Answers

The volume = 6.71 L

Further explanation

Charles's Law

When the gas pressure is kept constant, the gas volume is proportional to the temperature

$\tt (V_1)/(T_1)=(V_2)/(T_2)$

V₁=7 L

T₁=25 °C(room temperature) + 273 = 298 K

T₂=12.5(halved) + 273 = 285.5 K

$\tt (V_1)/(T_1)=(V_2)/(T_2)\n\n(7)/(298)=(V_2)/(285.5)\n\nV_2=6.71~L$

What are the efficient things needed for a village

Answers

Answer:

Those aspects which are something a village needs are specified beneath.

Explanation:

Things being equally necessary to make living simpler and therefore more enjoyable. The government has promised to continue providing basic facilities to either an unpopulated location, including such roads, drinkable water, as well as electric power.
Therefore, throughout the village, certain things accessible with maximum variety and quality that have become the basic requirements for this human existence.

What sample is a pure substance?A. a test tube of zinc oxide.b. a container of zinc and oxygen.
c. a flask of pond water.
d. a jar of soil.

Answers

The correct answer is A. A test tube of zinc oxide. Zinc oxide is a compound which is a pure substance composed of two or more elements. They can only be separated or broken down into its individual elements or smaller compounds by chemical means. Therefore, the answer is a test tube of zinc oxide.

The sample that is a pure substance is:A. a test tube of zinc oxide.

What sample is a pure substance?

A pure substance consists of only one type of substance with uniform properties throughout. In this case, a test tube of zinc oxide would be a pure substance. Zinc oxide (ZnO) is a chemical compound made up of zinc (Zn) and oxygen (O) atoms in a fixed ratio. It has a specific chemical formula and a consistent composition, making it a pure substance.

On the other hand:

B. A container of zinc and oxygen would be a mixture since it contains two different substances, zinc and oxygen, in their elemental forms.

C. A flask of pond water is a mixture because it contains a combination of different substances, such as water, dissolved minerals, microorganisms, and organic matter.

D. A jar of soil is also a mixture since it consists of a combination of various components, including minerals, organic matter, water, air, and possibly microorganisms.

Therefore, the correct answer is A. a test tube of zinc oxide, which represents a pure substance.

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