CHEMISTRY HIGH SCHOOL

Why does ionization energy decrease moving down a group in the periodic table?

Answers

Answer 1
Answer:

Answer:

Electron shielding

Explanation:

Ionization energy decreases moving down a group in the periodic table because of a phenomen known as Electron shielding, in which valence electrons do not interact with the positively charged nucleus as strongly as inner electrons do, because these inner electrons shield the valence electrons. This means it's easier for these valence electrons to leave the atom the more inner electrons are between them and the nucleus, this translates into a decreased ionization energy value.

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When 2 mol of Fe(s) reacts with Cl2(g) to form FeCl3(s) according to this equation, 799 kJ of energy is evolved. Calculate ΔrHo. A) -399.5 kJ mol^-1 B) -199.75 kJ mol^-1 C) 399.5 kJ mol^-1 D) 199.75 kJ mol^-1
Consider the following reaction: 2Mg(s)+O2(g)-->2MgO(s) delta H=-1204kJa) Is this reaction exothermic or endothermic? exothermic endothermicb) Calculate the amount of heat transferred when 3.55 g of Mg(s) reacts at constant pressure. delta H = -87.9 kJc) How many grams of MgO are produced during an enthalpy change of -238 kJ ? m = ?gd) How many kilojoules of heat are absorbed when 40.5 g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure? delta H =? kJ

Which one of the following is smallest in size?

N3-               O2-               F-                Na

Answers

F- is the smallest because it accepts 1 electron 2 make its atomic number 10 making it have jst 2 orbitals but O²-,N³- and Na have their atomic number to be 18,17 and 11 respectively with 3 orbitals..
hope this helps *winks*
F- is the smallest. Na is largest, so that would not be correct 100%

A chemical reaction in which compounds break up into simpler constituents is a _______ reaction.a. combination
b. decomposition
c. double replacement
d. substitution

Answers

the awnser to ur question is B

B. Decomposition, I remember reading this in my student workbook. Hope this helped!

What elements of paint can help forensic scientists compare samples to each other?

Answers

Paints consist of pigments, solvents, and binders. Once the paint has been applied and has dried, the pigments are still able to be determined and matched to other samples.

What is added to Paints?

Manufacturers apply a variety of coatings to the body of an automobile, which adds significant diversity to automobile paint. This diversity makes it easier of the forensic scientist to compare different paint samples.

When paint specimens possess colored layers that match with respect to number and sequence of colors, the examiner can begin to think confidently in terms of relating the paints to a common origin.

The shortcoming of analysis of paint layer structures is the most paint specimens presented to the criminalist do not have layer structure sufficiently complex to allow individualization to a single source.

Therefore, Paints consist of pigments, solvents, and binders. Once the paint has been applied and has dried, the pigments are still able to be determined and matched to other samples.

Learn more Paints, here:

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It would have to be paints consists of pigments,solvents, and binders. Once the [paint has been applied and has dried, the pigments are still able to determine the matched samples.

The solubility of KClO3(s) in water increases as the(1) temperature of the solution increases
(2) temperature of the solution decreases
(3) pressure on the solution increases
(4) pressure on the solution decreases

Answers

Answer: option (1) solubility of the solution increases.


Justification:


The solubility of substances in a given solvent is temperature dependent.


The most common behavior of the solubility of salts in water is that the solubiilty increases as the temperature increase.


To predict with certainty the solubility at different temperatures you need the product solubility constants (Kps), which is a constant of equlibrium of the dissolution of a ionic compound slightly soluble in water, or a chart (usually experimental chart) showing the solubilities at different temperatures.


KClO₃ is a highly soluble in water, so you do not work with Kps.


You need the solubility chart or just assume that it has the normal behavior of the most common salts. You might know from ordinary experience that you can dissolve more sodium chloride (table salt) in water when the water is hot. That is the same with KClO₃.


The solubility chart of KlO₃ is almost a straight line (slightly curved upward), with positive slope (ascending from left to right) meaning that the higher the temperature the more the amount of salt that can be dissolved.

Answer: Option (1) is the correct answer.

Explanation:

Solubility of a solute gets affected by change in temperature. That is, when we increase the temperature then more and more solute particles will dissolve into the solvent or solution.

Therefore, solubility of KClO3(s) in water increases as the temperature of the solution increases because on increasing the temperature it will completely dissociate into the solution.

Select all that apply. The three subatomic particles are _____. neurons photons protons neutrons charges electrons

Answers

Neutrons, Electrons, and Protons
Neutrons are the neutrally charged particles that are found in the nucleus.
Protons are the positively charged particles that are found in the nucleus.
Electrons are the negatively charged particles that are found in the atom's orbitals/shells

Answer:Neutrons, Electrons, and Protons

Which element is classified as an alkali metal?

Answers

Explanation:

All the elements of group 1 in the periodic table are known as alkali metals. These are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (fr).

Characteristics of alkali metals are as follows.

  • Alkali metals are soft and can be cut with a knife.
  • They are good conductors of heat and electricity.
  • They have only 1 electron in their outermost sub-shell.
  • They are very reactive.
  • Alkali metals are ionic in nature.
The alkali metals are a group (column) in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K), [note 1] rubidium (Rb), caesium (Cs), [note 2] and francium (Fr). 
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