CHEMISTRY HIGH SCHOOL

As a Ca atom undergoes oxidation to Ca2+, the number of neutrons in its nucleus(1) decreases
(2) increases
(3) remains the same

Answers

Answer 1
Answer:

Answer:

Hence the correct answer is remains the same

Explanation:

As a Ca atom undergoes oxidation to Ca2+,as follows:

Ca --- Ca 2+ + 2e-

In the process of oxidation calcium loss 2 electron only there is no change in the number of protons as well neutrons therefore there is no change in the number of neutrons in its nucleus

Hence the correct answer is remains the same

Oxidation:

Oxidation is a process in which either 1 or all following changes occurs:

1. Gaining of oxygen atoms

2. Loss of electrons

3. Loss of hydrogen atom.

4. Increasing oxidation number.

Reduction:

Reduction is a process in which either 1 or all following changes occurs:

1. Loss of oxygen atoms

2. Gaining of electrons

3. Gaining of hydrogen atom.

4. Decreasing oxidation number.
Answer 2
Answer: Oxidation refers to a change in electrons (In this case, loss of electrons). It has no impact on the number of neutrons, or for that matter on any sub-atomic particles in the nucleus. So the number of neutrons (3) remains the same

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What location is 90 degrees away from the equator?A) The south poleB) PolarisC) Both A & BD) The north pole

how does volcanic activity affect climate are these effects examples of short term or long term climate change

Answers

It can destroy a community which would make it dense and difficult to survive in and then stimulate a pioneer community starting with moss and ferns. which will start a new little ecosystem. So, these effects would be long term, though it can effect the climate in many different ways.

Which is evidence that a chemical Reagan occurred?A. A phase change occurs
B. A new gas is observed in the form of bubbles
C. Red and yellow paint mixing to make orange
D. The temperature of the substance remains constant updates

Answers

To solve such this we must know the concept of chemical reaction. Therefore, the correct option is option B that is  a new gas is observed in the form of bubbles.

What is chemical reaction?

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

The characteristics of chemical reaction are:

Evolution of a Gas

Change in temperature

Change in color

Formation of Precipitate

The evidence that a chemical reaction has occurred is  a new gas is observed in the form of bubbles.

Therefore, the correct option is option B that is  a new gas is observed in the form of bubbles.

Learn more about the chemical reactions, here:

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How many grams of CaCl₂ should be dissolved in 500.0 mL of water to make a 0.20M solution of CaCl₂?

Answers

0.2M means 0.2mol CaCl2/1L solution.

This question didn't give us a density of the solution so needs an assumption that the solution has equal volume to water.

xmol/0.5L=0.2M
x = 0.1

0.1mol of CaCl2 is needed. Ca=40g/mol, Cl=35.5g/mol.
CaCl2 0.1mol = (40+35.5*2)*0.1=11.1g

Find the mass of AlCl3 that is produced when 10 g of Al2O3 reacts with 10 g of HCl according to the following equation Al2O3(s) + 6HCl(aq) --> 2AlCl3(aq) + 3H2O(aq) Please select the correct option: A. 16.2 g B. 20.0 g C. 10.0 g D. 6.10 g E. 12.2 g

Answers

Answer:

Considering the reaction stoichiometry and the definition of limiting reagent, the mass of AlCl₃ that is produced when 10.0 grams of Al₂O₃ react with 10.0 grams of HCl is 12.19 grams.

Explanation:

Al₂O₃ + 6 HCl → 2 AlCl₃ + 3 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:  

Al₂O₃: 1 mole

HCl: 6 moles

AlCl₃: 2 moles

H₂O: 3 moles

The molar mass of the compounds present in the reaction is:

Al₂O₃: 102 g/mole

HCl: 36.45 g/mole

AlCl₃: 133.35 g/mole

H₂O: 18 g/mole

Then, by reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of mass of each compound participate in the reaction:  

Al₂O₃: 1 mole× 102 g/mole= 102 grams

HCl: 6 moles× 36.45 g/mole= 218.7 grams

AlCl₃: 2 moles× 133.35 g/mole= 266.7 grams

H₂O: 3 moles× 18 g/mole= 54 grams

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 102 grams of Al₂O₃ reacts with 218.7 grams of HCl, 10 grams of Al₂O₃ reacts with how much moles of HCl?

mass of HCl= 21.44 grams

But 21.44 grams of HCl are not available, 10 grams are available. Since you have less moles than you need to react with 10 grams of Al₂O₃ , HCl will be the limiting reagent.

Then, it is possible to determine the mass of AlCl₃ produced by another rule of three: if by stoichiometry 218.7 grams of HCl produce 266.7 grams of AlCl₃, if 10 grams of HCl react how much mass of AlCl₃ will be formed?

mass of AlCl₃= 12.19 grams

In summary, the mass of AlCl₃ that is produced when 10.0 grams of Al₂O₃ react with 10.0 grams of HCl is 12.19 grams.

A substance that can donate a pair of electrons to form a covalent bond is known as a(n) _____ base.

Answers

Answer : A substance that can donate a pair of electrons to form a covalent bond is known as a(n) Lewis-base.

Explanation :

According to the Lewis acid-base theory,

Lewis acid : It is a substance that can accepts pairs of electrons to form a covalent bond.

Lewis-base : It is a substance that can donates pairs of electrons to form a covalent bond.

For example :

H^++OH^-\rightarrow H_2O

In this reaction, H^+ ion is Lewis-acid and OH^- ion is a Lewis-base. The OH^- ion donates electrons to H^+ ion to form H_2O.

Hence, a substance that can donate a pair of electrons to form a covalent bond is known as a(n) Lewis-base.

A substance that can donate a pair of electrons to form a covalent bond is known as a Lewis base. It is any substance that can donate a pair of nonbonding electrons. The Lewis theory suggests that acids react with bases to share a pair of electrons with no change of oxidation numbers of any atoms.

Which subatomic particle(s) are found in the nucleus of the atom?. Enter the subatomic particle or particles separated by commas.

Answers

The subatomic particles found in the nucleus of the atom are:

Protons, Neutrons
The subatomic particles found inside the nucleons of the atoms are also referred to as the "nucleons". The nucleons are the protons, which are positively charged,  and neutrons, which are neutral. The negatively charged subatomic particles, electrons, are found outside the nucleus. 
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