CHEMISTRY HIGH SCHOOL

Which is NOT an indicator of a chemical change? Heat or light is produced. State of matter changes. A new substance is formed. A gas is formed.

Answers

Answer 1
Answer: The choice that is not an indicator of a chemical change is "State of matter changes". More common than not, chemical reactions produce energy in the form of light or heat. Along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid). Technically, a change in state is a physical change unless it also involves one of the other choices.
Answer 2
Answer:

Answer:

State of matter changes.

Explanation:

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The atomic mass unit (amu) isa. the mass of a single atom of carbon
b. one millionth of a gram
c. approximately the mass of a proton
d. approximately the mass of an electron

Answers

That would be c. approximately the mass of a proton

An analysis of an oxide of nitrogen with a molecular weight of 92.02 amu gave 69.57% oxygen and 30.43% nitrogen. What are the empirical and molecular formulas for this nitrogen oxide? Complete and balance the equation for its formation from the elements nitrogen and oxygen.

Answers

The empirical formula is  No2   and molecular formula is N2O4

empirical formula calculation

find the moles of each reactant

=% composition/molar mass

molar mass of oxygen=16 g/mol ,while hat of nitrogen= 14 g/mol from periodic table

moles is therefore=

                           nitrogen=  30.43/14=2.174 moles

                            oxygen=  69.57/1 6=4.348 moles

find the mole ratio by dividing each moles with smallest number of mole( 2.174)

                        nitrogen = 2.174/2.174= 1

                       oxygen = 4.348/2.174=2


The balanced equation  for its formation from the element nitrogen and oxygen is as below

N2 +2 O2 → N2O4

therefore the empirical formula= NO2

molecular  formula  calculation

[NO2] n= 92.02 amu

[(14) + (16x2)]n = 92.02 amu

46n= 92.02

divide both side by 46

n=2

therefore the molecular formula is gotten by multiplying the empirical formula by 2= [NO2]2= N2O4

A salt is best described as a compound that is formed from the reaction between

Answers

mical Compound

In chemistry, a salt is an ionic compound that results from the neutralization reaction of an acid and a base. Salts are composed of related numbers of cations and anions so that the product is electrically neutral.

Answer:

A

An acid and a base

Explanation:

Neutralization is a reaction between a(n)a. acid and a base.
b. acid and a metal.
c. base and a salt.
d. salt and water.

Answers

When an acidic solution and a basic solution come together, they cancel each other out thus neutralizing. So A is your answer

Im gonna stick with C base and a salt.

The most stable group of elements on the periodic table is the?A) halogens
B) noble gases
C) alkali earth metals
D) alkaline earth metals

Answers

The most stable because they can contain the most valence electrons in their outer shell. The correct option is B.

Thus, The group of elements on the periodic table known as noble gases, commonly referred to as inert gases, is thought to be the most stable.

They are radon (Rn), krypton (Kr), xenon (Xe), neon (Ne), helium (He), and argon (Ar). Noble gases are extremely stable and less likely to combine chemically with other elements because they contain entire valence electron shells.

Their full electron configurations, which result in low reactivity, are the cause of this stability.

Thus, The most stable because they can contain the most valence electrons in their outer shell. The correct option is B.

Learn more about Valence electrons, refer to the link:

brainly.com/question/31264554

#SPJ3
B) Noble gases
Most stable because they have the maximum number of valence electrons their outer shell can hold

ANALOGY: Evaporates are to chemical sedimentary as dead fish are to clastic sedimentary.

Answers

Your answer will be false.
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