CHEMISTRY HIGH SCHOOL

What does inertia depend on??

Answers

Answer 1
Answer: Inertia depends on the mass of an object. 
Answer 2
Answer:
It depends on a mass of an object.

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Atoms of different isotopes of the same element differ in their total number of electrons neutrons protons valence electrons

Answers

The ans is neutrons. Isotopes of the same element have the same number of protons(and neutrons) but different number of neutrons.

How many protons and electrons are in an atom of sodium whose atomic number is 11?

Answers

Atomic number is also known as proton number, so it would have 11 protons. Assuming you mean a neutral atom, it will have to have an equal number of electrons to protons, so it has 11 electrons too

Final answer:

An atom of sodium, with an atomic number of 11, has 11 protons and 11 electrons. The atomic number is indicative of both the number of protons in an atom and, in a neutral atom, the number of electrons.

Explanation:

The atomic number of an element corresponds to the number of protons in the nucleus of its atom. So, an atom of sodium whose atomic number is 11 has 11 protons. As the atom is neutral, it also means that the atom will have 11 electrons to balance the 11 positive charges of the protons. This information can be found on the periodic table, which gives the atomic number and the atomic mass of each element.

Learn more about Atomic Structure here:

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Find the pH of the following solution. 1.2 L of a solution containing 5.0x10^-4 grams of hydrobromic acid.

Answers

The HBr is a strong acid, that is, it is fully consumed in the reaction

molar mass HBr = 80.91 g/mol

number of moles = 5.0 x 10⁻⁴ / 80.91 = 6.17 x 10⁻⁶ moles

molarity = 6.17 x 10⁻⁶ / 1.2 = 5.14 x 10⁻⁶ M

HBr -------------------  H₃O⁺   +           Br ⁻
↓                                 ↓                     ↓
  5.14 x 10⁻⁶                0                     0
- 5.14 x 10⁻⁶             5.14 x 10⁻⁶   5.14 x 10⁻⁶ 
_____________________________________
0                             5.14 x 10⁻⁶ M         5.14 x 10⁻⁶ M

PH = - log [ H₃O⁺ ]

PH = - log [ 5.14 x 10⁻⁶ ]

PH = 5.82

a gas at 155 kPa and 298 K occupies a container with an initial volume of 1.00 L. By changing the volume, the pressure of the gas increases to 605 kPa as the temperature is raised to 398 K. What is the new volume?

Answers

Given: P1=155kPa P2=605kPa   T1=298K  T2=398K V1=1.00L

Unknown: V2=?

Formula: V2= V1P1T2/P2T1

Solution: V2= 1.00Lx155kPax398K/605kPax298K
               V2= 61,690/180,290=n
Answer: V2= 0.34L is the new volume

Sawing a board in half is an example of a chemical change

Answers

Sawing a board in half is a physical change not a chemical change the board doesnt change wood or whatever material it is is still would still be wood
If it were burned it would be a chemical change but its properties stay the same atomically so thats why its not a chemical change.

What is Aqua Auras mineral family/class?

Answers

Aqua Auras belong to the Quartz family. It's a synthetic type of Quarts that was enhanced with the help of gold coating, and sometimes other materials. The reason why it's called as aqua is because of its distinctive blue color thanks to the procedure which made it.
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