The metal wire in an incandescent light bulb glows when the light is switched on and stops glowing when it is switched off. This simple process is which kind of a change?

Answers

Answer 1

Answer: physical change because the matter in the object is not chemically changing

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What is the displacement of 40 meters?

Answers

Answer:

Along with solving the question, I'll try to clear the concepts involved.

Distance: Total path actually traversed by the object.

Distance is a scalar quantity. Hence, No need to consider the direction.

Here the object…

First travelled 30 m towards East & then travelled 40 m towards North.

Distance = 30 m + 40 m = 70 m

8 Which quantity is equal to one mole of Au?(1) the atomic mass in grams(2) the atomic number in grams
(3) the mass of neutrons in grams
(4) the number of neutrons in grams

Answers

Answer is (1) the atomic mass in grams since One mole of any element is equal to the atomic mass in grams.

Answer: option (1) the atomic mass in grams.

Explanation:

1) The atomic mass is the mass in grams of one mole of atoms.

2) Hence, it is always the atomic mass of an element equal to the mass of one mole of atoms of such element. Therefore, the atomic mass of Au is the mass of one moles of atoms of Au.

3) Here are some examples:

i) Atomic mass of gold: 196.67 g/atoms, means that 196.97 grams of Au is one mole of Au.

ii) Atomic mass of hydrogen: 1.008 g/mol, means that 1.008 grams of H is one mole of H.

iii) Atomic mass of oxygen: 15.999 g/mol, means that 15.999 grams of O is one mole of O.

iv) Atomic mass of lead: 207.2 g/mol, means that 207.2 grams of Pb is one mole of Pb.

Now you see it, the atomic mass in grams of an element is equal to one mole of the element.

Highlight the basic points in Lewis and Langmuir theory of electrovalency

Answers

The correct answer for the question that is being presented above is this one: "Electrovalency is characterized with the transferring of one or more electrons from one atom to another together with the formation of ions and as well as the number of positive and negative charges.

The Lewis and Langmuir theory of electrovalency (and as well as Kossel's) is dealing with Ionic bonds.

Lewis: electron-pair sharing, octet rule, Lewis Symbols or StructureLangmuir: introduced term "covalent" bond, and popularized Lewis's ideas

The Lewis-Langmuir electron-pair or covalent bond is referred as the homopolar bond, where the complete transfer of electrons give rise to ionic, or electrovalent bond (1) through attraction of opposite charges.

When a bond is formed, energy is _________ the environment.A. released into
B. released from
C. kept stable in

Answers

When a bond is formed, energy is released into the environment. That is because it is an exothermic reaction, it releases energy.

Answer: can confirm that A: Released into. Is the correct answer

8H2 + S8 8H2S Based on the mole ratios, what can most likely be predicted?
A.1 mol of hydrogen will react with 1 mol of sulfur.
B.8 mol of hydrogen will react with 1 mol of sulfur.
C. 8 mol of hydrogen will react with 8 mol of sulfur.
D.16 mol of hydrogen will react with 8 mol of sulfur.

Answers

I believe the correct answer from the choices listed above is option B. Based on the mole ratios in the chemical reaction, we can say that 8 mol of hydrogen will react with 1 mol of sulfur. I am certain with this reaction. Hope this answers the question.

Answer: B

Explanation: Queen B told me

The diagram shows an animal cell.Which letter marks the location where carbon dioxide is
produced during respiration?

W
X
Y
Z

Answers

Answer:

Explanation:

Letter X is mitochondria. The mitochondria produces carbon dioxide, water, and ATP energy during cellular respiration.

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