CHEMISTRY HIGH SCHOOL

A hydrogen atom cannot emit an alpha particle true false

Answers

Answer 1
Answer: false.


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Infrequent participation in physical activity can lead toa. high blood pressure during exerciseb. muscle strain and soreness after exercisec. extra calories burned during exercised. low heart rate after exercise
What is the pH of a Koh solution that has [H+]=1.87×10^-13M
What type of element is chlorine? metal. alkaline earth metal. halogen. inner transition metal.
How many moles of calcium chloride would be produced by the reaction below when 53.2 milliliters of water are produced, if the density of water is 0.987 g/mL? Show all steps of your calculations as well as the final answer HCl + Ca(OH) 2 → H2O + CaCl2
In which chemical reaction will the heat content of the reactants be more than that of the products?

Dermatological bases are classified according to?

Answers

Dermatological bases are classified according to structure and size. Dermatological bases are also classified based on the amount of water they can contain, whether they are water-washable and their method of preparation. I hope this helps you.

How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP?

Answers

The reaction of magnesium and hydrochloric acid is a single displacement reaction. The reaction is expressed as Mg + 2HCl= MgCl2 + H2. There is a one is to one correspondence of Mg and H2. Hence there is also 0.02 mol of H2. Using PV=nRT where T is 273 K, P is 1 atm and R is 0.0821 L atm/mol K, volume is equal to 0.4483 L or 448.3 mL.

Answer: The answer is D

Explanation:

Chemists use activity series to determine whether which type of reaction will occur?

Answers

Answer:

The correct answer is "single replacement".

Explanation:

The activity series is a representation of a series of metals that are organized according to their order of reactivity. They start from the highest order of reactivity to the lowest order of reactivity.

The purpose of the series is to determine which products are formed in single-displacement reactions. The higher-order metals replace the lower order metals if there are two of them in the same solution. If metal is higher in the series it is more reactive than a metal that is below it in the activity series.

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ICl has a higher boiling point than Br2. What is the best explanation for this?a.)Br2 experiences dipole0dipole interactions.
b.)ICl experiences dipole0dipole interactions.
c.)Br2 forms hydrogen bonds.
d.)ICl experiences induced dipole0induced dipole interactions.

Answers

The best answer is B. ICl experiences induced dipole-induced dipole interactions. Both iodine and chlorine belongs to the same group of the periodic table. Electronegativity decreases as you go down a group therefore Cl will have a greater attraction with the bond it forms with another atom. Dipole-dipole interactions form between I and Cl. For the Br2 molecule, no dipole occurs because they are two identical atoms. Therefore we will be expecting ICl will have a higher boiling point due to higher binding energy it forms.

16.H2O (water) and NaCl (salt) are _________ that are in salt water, which is a(n) __________. Water and salt contain the ____________ hydrogen, oxygen, sodium, and chlorine. Compounds; mixture; elements
Mixture; compounds; elements
Element; compounds; mixture
Compound; elements; compounds

12.The number of _____ determines which element it is.

electrons
protons
positrons
neutrons

Answers

#1...Mixture; compounds; elements
#2...Protons 

In a calcium atom in the ground state, the electrons that possess the least amount of energy are located in the(1) first electron shell
(2) second electron shell
(3) third electron shell
(4) fourth electron shell

Answers

According to the electronic configuration, a calcium atom in the ground  state electrons which possess least amount of energy are located in first shell.

What is electronic configuration?

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elementshave valence shell complete in ground state and hence are said to be stable.

According to the electronic configuration,as the number of shells increases their energy also increases .Hence, electrons in first shell have least energy.

Learn more about electronic configuration,here:

brainly.com/question/13497372

#SPJ2

Answer:

1

Explanation:

first electron shell.

First electron shell possesses the least amount of energy at the core.

Hope this helps.
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