CHEMISTRY HIGH SCHOOL

Name the following
Cr(SO4)2

Answers

Answer 1
Answer: Chromium sulfate.
Cr is chromium, and SO4 is sulfate.

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Which substance is an electrolyte?
(1) CH3OH (3) H2O
(2) C6H12O6 (4) KOH

Answers

Answer:

The answer is 4) KOH

Explanation:

Electrolytes are substances which ionize when dissolved in water. They are classified as:

Strong electrolyte: Which completely ionize when in water. Eg: NAOH, KOH (produces K+ and OH- ions when dissolved in water)

Weak electrolyte: partially ionize when in water. Eg: Acetic acid

Non-electrolyte: Do not ionize at all in water. Eg: Alcohols such CH3OH, sugars such as glucose (C6H12O6).

KOH is an electrolyte. Therefore, option (4) is correct.

Electricity flows via water-dissolved materials. Ions in a solution conduct electricity.The options:When dissolved in water, methanol (CH3OH) does not form ions.2. C6H12O6 (Glucose): It does not dissolve into ions in water, hence it is not an electrolyte.

Water doesn't dissolve into ions, hence it's not an electrolyte.4. Dissolved in water, potassium hydroxide (KOH) forms ions (K+ and OH-), making it an electrolyte. Therefore, KOH as an electrolyte is the correct option.

Learn more about electrolytes, here:

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Which  is larger a zinc atom or a zinc ion? explain 

 

Answers

It depends if the zinc ion lost or gained an electron. But electrons are more than 2,000 times smaller than a proton or neutron so small diffrence.

Which statement explains why the bonds between nonmetals tend to be covalent? The bonds are found to be nondirectional. They have large differences in electronegativity. They have small differences in electronegativity. They have ions that produce an electrostatic pull.

Answers

Correct Answer: They have small differences in electronegativity (statement 3)
Reason: 
The nature of chemical bond between atoms is primarily driven by the electronegativity  difference between constituent atoms. If electronegativity difference between constituent atoms is significantly higher, ionic bond formation is preferred. On other hand, low difference in electronegativity values, favours formation of covalent bond. 

What is the order, from simplest to most complex, for the classification of matter

Answers

B) element, molecule, compound, mixture is the answer just took the test ;) good luck : P

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

Answers

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 : 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

How is the number of neutrons and in nucleus of an atom calculated

Answers

Explanation:

Atomic number is defined as the sum of total number of protons present in an atom. Each element has different atomic number.

Whereas mass number is the sum of total number of both protons and neutrons present in an element.

For example, an atom with mass number as 15 and has atomic number 7. Then it means it has 7 protons.

Therefore, number of neutrons present in it will be calculated as follows.

                    Mass number = no. of protons + no. of neutrons

                         15 = 7 + no. of neutrons

                    no. of neutrons = 15 - 7  

                                               = 8

Thus, we can conclude that the number of neutrons is calculated as mass number minus total number of protons present in the atom.
The number of neutrons in an atoms nucleus can be calculated by subtracting the atomic number of that atom from its mass number.

(mass number - atomic number = number of neutrons)
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