What is the atomic mass of one mole of O?

Answers

Answer 1

Answer: Oxygen's atomic weight is 16.00 amu. 1 mole of oxygen is 6.02 x 10^23 atoms of oxygen 1 amu = 1.661 x 10^-24g. I hope this helps you. The correct answer for this question is "1.661 x 10^-24g".

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A physical change is __________ if energy is given off.Select one:
a. exothermic
b. endothermic
c. a chemical change
d. not possible

Answers

Answer:

Explanation:

Electric current is _____. the continuous flow of atoms in a conductor the continuous flow of static electricity in a conductor the continuous flow of electric charges in a conductor a staggered flow of charges in a conductor

Answers

Answer: The correct answer is the continuous flow of electric charges in a conductor.

Explanation:

Electric current is defined as the continuous flow of electric charges through a conductor. Direction of the electric current is opposite to the flow of electrons. It is represented by a symbol 'I' and its S.I. unit is Amperes.

Its value depends on the voltage and resistance. The equation representing the relationship between current, voltage and resistance is given by Ohm's Law, which is:

$V=IR$

where,

V is the voltage

I is the current

R is the resistance

Hence, the correct answer is the continuous flow of electric charges in a conductor.

Electric current is: C) the continuous flow of electric charges in a conductor.

The movement or flow of electric charges across a conducting media, such as a metal wire, is known as electric current. The mobility of electrons within the conductor is what causes the flow of charges. The flow of electric charges in the majority of conventional electrical circuits is from the negative terminal, where extra electrons build up, to the positive terminal, where there are insufficient electrons.

It's crucial to understand that the passage of atoms in a conductor is not what constitutes electric current. While atoms may vibrate or move slightly within a conductor, the passage of electrons is the main movement in charge of electric current.

Static electricity does not continuously flow through a conductor, and neither does electric current. An imbalance of electric charges on a material's surface is referred to as static electricity, which normally doesn't entail a constant flow or movement of charges.

A staggered passage of charges in a conductor is not how electric current behaves either. Charges flow continuously, uniformly, and orderly through the conductor in a steady electric current.

In conclusion, electricity and electrical circuits are based on the continuous flow of electric charges, typically electrons, in a conductor. Electric current is defined as this flow.

To know more about electric charges:

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How many grams of CaCl₂ should be dissolved in 500.0 mL of water to make a 0.20M solution of CaCl₂?

Answers

0.2M means 0.2mol CaCl2/1L solution.

This question didn't give us a density of the solution so needs an assumption that the solution has equal volume to water.

xmol/0.5L=0.2M
x = 0.1

0.1mol of CaCl2 is needed. Ca=40g/mol, Cl=35.5g/mol.
CaCl2 0.1mol = (40+35.5*2)*0.1=11.1g

As the density of a substance increases, the volume of a given mass of that substance__.a. Increases
b. is not affected
c. decreases
d. fluctuates

Answers

Answer : The correct option is, (C) decreases

Explanation :

As we know that the density is measured as the mass of substance divided by the volume of substance. The S.I unit of density is, kilogram per cubic meter or $Kg/m^3$

Formula for density :

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

That means the density is directly proportional to the mass of the substance and inversely proportional to the volume of the substance.

As the volume of substance decreases, the density of a substance will be increases and volume of substance increases, the density of a substance will be decreases.

Hence, the correct option is, (C) decreases

As the density of a substance increases the volume of a givenmass of the substance decreases

In a compound, chemical energy is contained in thea. nuclei of the atoms.
b. unbonded electrons.
c. bonds.
d. movement of the electrons.

Answers

The answer is C. bonds. Because chemical energy in compounds is stored in bonds between the molecules involved.

Further Explanation

Energy is the ability to do work, where work is the movement of objects by force. We use energy every day, and energy comes in different forms. Chemical energy is energy stored in chemicals, such as sugar and gasoline.

Chemical energy is energy stored in chemical compounds in the form of bonds between one atom with another atom. Chemical energy is an energy produced in a chemical process. The amount of energy produced depends on the type and amount of reagents in a chemical reaction. Devices that can produce energy from chemical reactions such as batteries and batteries.

Chemical Energy Sources

chemical allergens are stored in molecular bonds and when these bonds break, heat is released or absorbed. These molecules are part of chemical compounds or fuels such as coal, oil, biomass, wood, animal waste, natural gas, food, etc. and they are all sources of chemical energy that generates heat usually through combustion. Chemical energy sources can be classified into two types, depending on whether they are naturally or artificially prepared and depending on their natural state (solid, liquid, or gas):

Solid Fuel: wood, coal, lignite, etc.
Liquid fuels: gasoline, diesel, alcohol, kerosene, etc.
Gas Fuel: natural gas (coal gas, water gas, biogas)

All of these fuels contain hydrocarbons - organic compounds containing carbon and hydrogen - various molecular weights. These hydrocarbons may be alkanes (methane, ethane, propane, etc.), alkenes (ethene, propane, etc.), cycloalkanes, aromatic hydrocarbons, and heterocyclic compounds.

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Grade: High School

Subject: Chemistry

keywords: Chemical energy

Does a reaction occur?
Pb + Cu(CIO), → Pb(ClO3)2 + Cu