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3 years ago

A loud noise was heard (a, an) hour ago.*

2 answers:

6 0

A loud noise was heart an hour ago. The correct answer is the article AN. Although usually the article A is used before words beginning with a consonant, and AN before words beginning with a vowel, there are some exceptions. Here, the word hour is indeed written with a consonant as the first letter, however, it is pronounced as /ˈaʊə/, which begins as a vowel when you read it, which is why it takes the article AN.

Sonbull [250]3 years ago

3 0

The word that would complete the sentence, "A loud noise was heard ____ hour ago." is an. The use of "a" is for the consonant and "an" if the first letter of the word following it is even. However, the word "hour", though it starts with consonant letter , h, it is still pronounced as though it has even first letter.

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A student writes the following explanation of how certain molecules are formed.A process is used to chemically link smaller unit

tensa zangetsu [6.8K]

Answer:

polymerization

Explanation:

Student is explaining the process of formation of a polymer and the process is called polymerization.

Polymer is made up of joining repeating units. The repeating units are called monomers.

Properties of the polymer is determined by the structure of monomer molecule.

For example, consider a well-known polymer Teflon.is made by the polymerization of tetrafluoroethane.

Thus, the student is explaining polymerization.

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3 years ago

In the reaction:

Ghella [55]

Answer:

The answer is D because NH4+and OH- it will be

N-1. N-1,

H-5

O-1 H-5

O-1

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3 years ago

Can someone Summarize how the suns gravity affects the planets please.

egoroff_w [7]

The sun's gravity pulls the planet toward the sun, which changes the straight line of direction into a curve. This keeps the planet moving in an orbit around the sun. Because of the sun's gravitational pull, all the planets in our solar system orbit around it.

3 0

3 years ago

Read 2 more answers

What is the significance of "Er" in the diagram?

Drupady [299]

Answer:

The significance of "Er" in the diagram is :

B.) Threshold energy for reaction

Explanation:

Threshold energy : It is total amount of energy required by the reactant molecule to reach the transition state .

Activation energy : It is the excess energy absorbed by the molecules to reach the transition state.

Activation Energy = Threshold Energy - Average Kinetic Energy

This means Activation energy decreases on increasing kinetic energy

On increasing Temperature average kinetic energy of the molecule increases which reduces the activation energy and the reaction occur faster in that case.

Catalyst also reduces the Activation energy.

Er = Threshshold energy for reaction at 30 degree

Ea = Activation Energy

The given figure shows that the threshold energy decreases on increasing the temperature

Only the molecule having energy greater than Er can react to form product

3 0

3 years ago

Read 2 more answers

Which of the following statements is true of glare control?

galina1969 [7]

The correct option is B.
Indirect lighting refers to fixtures which direct the light upward to bounce off the wall or ceiling to light a room. This type of lighting is diffusely reflected and create less glare compare to direct lighting. Direct lighting usually direct the light downward, directly on to the surface below to provide illumination.

8 0

3 years ago