CHEMISTRY MIDDLE SCHOOL

A hypothesis is a possible explanation or answer to a question. Hypotheses should be testable. Which of the following sentences is the best hypothesis?A.
If a person falls asleep, then their heart rate will decrease.
B.
If a pillbug becomes frightened, then it will roll up into a ball.
C.
It is better to live in a city than in the country.
D.
Why are plant leaves green?

Answers

Answer 1
Answer: i am caught between A. and B. but, my brain says its A.
Answer 2
Answer: The answer is A)

This hypothesis could be tested because it can be measured. The experiment would need a dependent and independent variable, constant and control variable.

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Which of these is metamorphic rock formed from limestone? A.sandstone B.clay C.shale D.marble

Answers

D. Marble caused by heat and lots of pressure.

Answer:

Heres proof the first anwser is correct <3

Explanation:

What information could you use to determine the atomic number of an unknown elementthat has a mass number of 22?
O
A. number of ions
B. number of isotopes
C. number of neutrons
O
D. number of electrons

Answers

Answer:

The correct answer is option C.

Explanation:

Atomic number(Z) = Total number of protons present in a nucleus of an atom.

Atomic mass(M) = Sum of protons and neutrons present in the nucleus

M = Z + Total number of neutrons

If we are given with mass number of an element and we are said to determine the atomic number of the compound:

22  = Z + Total number of neutrons

Z = 22 - Total number of neutrons

We will require total number of neutrons to determine the atomic number of an unknown elementthat has a mass number of 22.
Answer:
The mass of an atom is based on the number of protons and neutrons in its nucleus.

What is the empirical formula for P4O10?

Answers

Answer: P2O5

Explanation: You divide both subscripts by 2 to get the empirical formula.

Answer:

Formula of P4O10 is P2O5.

Explanation:

WE GET IT BY DIVIDING BOTH SUBSCRIPTS BY 2.

Is cell division a form of reproduction? Explain. Why do you think this?

Answers

Cell division is the means of reproduction in organisms which reproduce asexually

Why can hydrogen only form one covalent bond?

Answers

because its in group one....which only lose or gain electrons.....thus it will only have oneelectron to fulfill its octect rule

Find the pH of 0.0282 M of HCIO4
B
U
T-
©
Write your answer...

Answers

Answer: 1.5

Explanation:

The acid, HCIO4 ionizes to give hydrogen ion (H+) and a conjugate base as follows:

HCIO4(aq) <---> H+(aq) + CIO4-(aq)

Hence, the H+ has also have a concentration of 0.0282 M

Mathematically, pH is expressed as:

pH = -log(H+), where H+ is the concentration of hydrogen ion.

So, for HCIO4

pH = - log (0.0282 M)

pH = - (-1.5497) (The two minus signs will cancel out)

pH = 1.5497

Round the pH value to the nearest tenth as 1.5

Thus, the pH of 0.0282 M of HCIO4 is 1.5, also HCIO4 is strongly acidic since pH values less than 7 are regarded as acidic.
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