CHEMISTRY HIGH SCHOOL

What is the Ka’aba?an Islamic deity
a Muslim pilgrim
a book of Sharia laws
an ancient stone temple

Answers

Answer 1
Answer:

Answer: Ka'aba is Muslim pilgrimage

Explanation: Kaaba is a small shrine located in Mecca and is considered as a sacred spot by Muslims.

It is a cube shaped structure made up of graystone and marble. It's corners correspond to the points of a compass and is mostly kept covered with a cloth called kiswah.
Answer 2
Answer:

Answer:

D. An ancient Stone Temple

Explanation:

Edg 2021

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How many grams of NaOH were dissolved to make a 1.25 L solution of 2.92 M NaOH?

Answers

Answer:

  • 146. g

Explanation:

1) Data:

a) mass of solute = ?

b) volume of solution = 1.25 liter

c) M = 2.92 mol/liter

d) solute NaOH

2) Formulae:

a) Molarity, M = number of moles of solute / volume of solution in liters

b) mass in grams = molar mass × number of moles

3) Solution:

a) Calculate number of moles of solute:

  • M = number of moles of solute / volume of solution in liters

        ⇒ number of moles of solute = M × volume of solution in liters

        ⇒ number of moles of solute = 2.92 mol/liter × 1.25 liter = 3.65 mol

b) Molar mass of NaOH = 39.997 g/mol (you can take this number from internet or calculate it using the atomic masses of Na, O, and H).

c) Calculate the mass of solute:

  • mass in grams = molar mass × number of moles = 39.997 g/mol × 3.65 mol = 145.98905 g = 146. g

The answer must be reported with 3 significant figures, so it is 146. g.

Which part of an atom determines how it will react with other atoms? a. neutrons in the nucleus
b. protons in the nucleus
c. valence electrons
d. innermost electrons

Answers

 valence electrons of an atom determines how it will react with other atoms
hope this helps

Answer: C. valence electrons

Explanation: Study Island

What are two examples of an endothermic reaction and what are two examples of an ectothermic reaction?

Answers

Exothermic processes: Making ice cubes,formation of snow in clouds


Endothermic processe: Melting ice cubes, evaporation of water

Click on the diagram to choose which atom is more reactive.

Answers

Answer:

Second graph is more reactive.

Explanation:

I just did the lesson myself, chose the first graph, and obviously got it wrong.

Therefore I can tell you with 100% certainty that the correct answer is graph #2 in this case.  Hope this helps.

The first diagram is the atom that is more reactive

What is not an example of a. Catalyst

Answers

The combustion of coal

In what respect does an atom of magnesium differ from a magnesium ion (Mg^{2+})? (A)The ion has a more stable electronic arrangement than the atom.
(B)The positive charge on the nucleus of the ion is two units greater than the nuclear charge on the atom.
(C)The ion has two more protons than the atom.
(D)The ion will react more readily with free Cl₂.
(E)The ion has two more planetary electrons than the atom.
Can anyone explain this one?

Answers

both b and d are correct however the ion reacts more readily to a number of different elements. not just Cl2 so the best correct answer is b: the positive charge on the nucleus of the ion us two units greater than the nuclear charge on the atom.
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