CHEMISTRY HIGH SCHOOL

Find the product.
(n + 8)(n - 2)
n2- 6n - 16
n2+ 6n - 16
n2- 6n + 16

Answers

Answer 1

Answer:

Answer:The product of the given expression is : $n^2+6n-16$

Explanation:

Given expression:(n + 8)(n - 2)

Using identity: $(a+b)(a+c)=a^2+(b+c)a+bc$

a = n, b=8, c= (-2)

$n^2+(8+(-2))n+(8)(-2)$

$n^2+6n-16$

The product of the given expression is : $n^2+6n-16$

Answer 2

Answer:

Answer : The product of the given expression is:

$n^2+6n-16$

Explanation :

The given expression is:

$(n+8)(n-2)$

First we have to open the bracket by multiplying the terms.

$n^2-2n+8n-16$

Now we are adding like terms.

$n^2+6n-16$

Hence, the product of the given expression is, $n^2+6n-16$

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Which hydrocarbons are present in styrene?a) alkene b) alkyne c) none of the above?

Which of the following is not an acid? HCl

H2SO4

HNO3

NaOH

Answers

NaOH is not an acid. It is categorized as a base, specifically a strong base, since it has the capability to accept protons from any proton donor and, when it is in aqueous form, it fully dissociates into ions of sodium and hydroxide.

Any substance that tastes unpleasant in water solution, turns blue litmus paper red, reacts with some metals to release hydrogen, combines with bases to create salts, and stimulates chemical processes is considered an acid. Here among the given options, NaOH is a base. The correct option is D.

Any hydrogen-containing material that has the ability to donate a proton (hydrogen ion) to another chemical is considered an acid. A base is a molecule or ion that can take up an acid's hydrogen ion. Typically, sour tastes help to identify acidic chemicals.

An acid is not NaOH. It is categorized as a base, more specifically a strong base, because it can receive protons from any proton donor and completely dissociates into sodium and hydroxide ions in an aqueous form.

Thus the correct option is D.

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What is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level ?a.) 1.52x10^4 J b.) 3.63*10^-19 J c.) 2.18x10^-19 J d.) 4.48x10^-9 J e.) 3.03*10^-19J

Answers

$3.03*10^-19J$ is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level.

What are Energy Levels?

The electrons that surround an atom around the nucleus are located in regions called "energy levels". It represents the 3-D space that surrounds the nucleus where the electrons are present. It is divided into several energy levels such as first energy level, second energy level and so on.

The level that is closest to the nucleus is the first energy level, then the second one is further away from it, then the third one is a little further away and so on. Each energy level has different number of electrons like first has 2 electrons, second has 8, third has 8 and so on. The electrons which are further away from the nucleus are called valence electrons.

For given above information,

E = - $E_o$ / $n^2$

where,

$E_o$ = 13.6 eV (1 eV = 1.602×10-19 Joules) and n = 1,2,3… and so on so that the ground state has energy $E_1$ = -13.6 eV and the second energy level (the first excited state) has energy $E_2$ = -13.6/4 eV = -3.4 eV.

So,

1eV = 1.602× $10^-^1^9$ J

Energy difference can be calculated by -13.6eV ( $1/$ $n^3_f$ - $1/n^2_i$ )

$n_f$ = Final energy; $n_i$ = Initial energy

1.88 eV is equals to x

So, x= 3.03* $10^-^1^9$

Thus, $3.03*10^-19J$ is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level.

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Doubling the number of particles of gas in an inflated tire will double the pressure of the gas in the tire.a. True
b. False

Answers

True - more particles will be able to hit off the tire wall, therefore higher pressure

True, I got it right on the test

When the first periodic table of the elements was published, the elements were arranged by atomic mass. Although several elements seemed out of order, later discoveries showed the order to be correct. Which event most likely helped the development of the periodic table?

Answers

Answer;

New information changed the understanding of the atom’s structure.

Explanation;

Mendeleev is know as the Father of the Modern Periodic Table. His table allowed scientists to predict the existence of elements that hadn't been discovered.
Mendeleev saw that when the elements were arranged in order of increasing atomic mass, those that had similar properties occurred in a repeating pattern. He predicted that elements yet to be found would fill the gaps in his table.

Name two metals that do not always lose the same number of electrons

Answers

Copper and Iron are two metals that can lose different numbers when they react with another molecule.

What are transition metals?

These are the metals that have variable valence electrons and form many-colored co-ordinate compounds.

The transition metals have variable oxidation state means they can lose different numbers of electrons while making a bond.

The variable oxidation state is due to the electronic configuration in which they have partially filled d- block which allows them to have variable oxidation numbers.

Therefore, copper and Iron are two metals that can lose different numbers when they react with another molecule.

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it would be copper and iron -A

Which element has the following mass spectrum?

Will mark as Brainliest✅

Answers

Cf, the element has the following mass spectrum. Therefore, option (D) is correct.

California (Cf) is a radioactive element with a complicated mass spectrum that shows its isotopic makeup and decay trends. Peaks in Cf's mass spectrum denote isotopes with differing mass-to-charge ratios. These peaks signify isotopes, which are elemental atoms with varying neutron counts.

The mass spectrum yields important information about the sample's isotope abundance and masses. Researchers can determine Cf's isotopic distribution and nuclear characteristics like decay modes and half-lives by analyzing peaks and intensities. This is crucial since Cf's radioactivity and prospective uses in nuclear research and medicine are vital.

In conclusion, Californium's massspectrum reveals its isotopic makeup and behavior, helping researchers understand its characteristics and uses. Therefore, option (D) is correct.

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the answer is cf that the answer

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