CHEMISTRY HIGH SCHOOL

The coolest stars in the sky are ____ in color

Answers

Answer 1

Answer: Red is the answer in the blank

Answer 2

Answer:

Answer:

They are Red.

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the balanced chemical equation for one neutralization reaction. In your equation, which reactant contributed the salt's positive ion? Which one contributes the salt's negative ion?

Answers

Answer:

See the answer below

Explanation:

A neutralization reaction is a reaction that involves acid and base with the production of salt and water as the end products. An example is as below:

HCl + NaOH --> NaCl + H2O

The salt produced here is NaCl. In solution, NaCl will ionize as:

$NaCl --> Na^+ + Cl^-$

Hence, the salt's positive ion (Na+) was contributed by the base (NaOH) while its negative ion (Cl-) was contributed by the acid (HCl).

Final answer:

In a neutralization reaction involving Ba(OH)2 and HNO3, the salt's positive ion comes from the base and the negative ion comes from the acid. In the molecular and net ionic equations, spectator ions, which are unaltered in the process, are included and excluded respectively.

Explanation:

In a neutralization reaction, an acid and a base react to produce water and a salt. Taking the provided reaction of Ba(OH)2 (aq) + 2HNO3(aq) → Ba(NO3)2(aq) + 2H₂O(1), the salt's positive ion (Ba²+), also known as the cation, comes from the the base, Ba(OH)2. The salt's negative ion (NO3-), also known as the anion, comes from the acid, HNO3. This reaction also represents a molecular equation where all reactants and products are represented as neutral substances. A net ionic equation would exclude the spectator ions, ions whose presence is required to maintain charge neutrality but are chemically and physically unaltered by the process.

Learn more about Neutralization Reactions here:

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The shortest wavelengths occur in the:red end of the spectrum
blue end of the spectrum
middle of the spectrum

The light-gathering capacity of a telescope is dependent upon the:
magnification
focal length
size of human iris
area of aperture

Answers

Answer:

1) blue end of the spectrum

2) area of aperture

Explanation:

1) The electromagnetic spectrum encompases a wide range of frequency (ν) and wavelength (λ) that includes gamma rays, x-rays, ultra violet(UV), visible, infra red (IR), microwaves and radiowaves. The wavelength increases from gamma rays to radio waves.

The wavelength perceivable by human eyes lies in the UV-visible region which extends from 380 nm in the blue to 740 nm in the red.The shortest wavelengths occur in the blue end of the spectrum which also have the highest energy. In contrast, longer wavelengths occur on the red which have lower energy.

2) The light gathering capacity of a telescope is dependent upon its area of aperture. Larger the area, greater is the light gathering power which implies that the telescope has the capability of detecting weak or faint objects.

The area of the aperture is essentially the area of the objective of the telescopic lens which is given as:

$area = (\pi*D^(2) )/(4)$

where D = diameter of the lens

1) blue end of the spectrum

2) area of aperture

Salt crystals are shaped like cubes. Salt is part of the _____.

Answers

Answer:

The correct answer is: cubic or isometric crystal system

Explanation:

The cubic crystal system, also known as the isometric crystal system, is one of the seven crystal systems, that has a cubic unit cell.

It can be classified into three types: simple cubic system, body-centered cubic system (bcc) and face-centered cubic system (fcc).

The salt, sodium chloride, forms isometric crystals and thus is part of the cubic or isometric crystal system.

salt is isometric as they're blocks or cubes.

Which change is exothermic?(1) freezing of water(2) melting of iron(3) vaporization of ethanol(4) sublimation of iodine

Answers

The answer is (1) freezing of water. The energy of different status is increase from solid to liquid to gas. So the change of liquid to solid is exothermic. The other three are endothermic.

Tap water ph 7.2 acidic

Answers

A pH of 7.2 would mean it is basic. 0-6 Acidic. 7 - Neutral. 8-14 - Basic.

Given the reaction below, which is the oxidized substance? Mg + Cl2 mc005-1.jpg Mg2+ + 2Clmc005-2.jpg 2CI- CI2 Mg Mg2+

Answers

A oxidation-reduction reaction, also known as redox reaction, is a reaction which involves transfer of electrons between species. It is a reaction where there are changes in the number of the oxidation number by gaining or losing electrons. From the reaction, the oxidized substance is magnesium. It was oxidized from an oxidation number of 0 to +2.

Answer:

Mg ( C )

Explanation:

Other Questions

What is the symbol for magnesium

Starch and cellulose are both produced by plants, yet one is easily digested by animals and the other is not. Discuss the differences in the structures of these two molecules and how this may impact whether they can be digested.

Contains elements in the solid, liquid, and gas phase a. alkali metals b. alkaline earth metals c. transition metals d. halogens e. noble or inert gases

Compounds have similar properties to the elements of which they are made.For example, FeS is magnetic and smelly, since iron (Fe) and sulfur (S) are attracted to a magnet, and possess an odor of eggs,respectivelyTrueFalse