Beginning with an explanation of gravity's effect on a nebula, explain how we humans owe our existence to gravity.

Answer:

Use the formula v=fλ Divide the velocity by the frequency to find the wavelength. (Make sure you add the unit λ for your final answer)

V: Velocity

F: Frequency

λ: Wavelength

Answer:

C₆H₁₂O₆ and O₂ are reactant.

CO₂ and H₂O are products.

C₆H₁₂O₆ + 6O₂  →  6CO₂ + 6H₂O + ATP

Explanation:

There are two types of respiration:

1. Aerobic respiration  

2. Anaerobic respiration

Aerobic respiration

It is the breakdown of glucose molecule in the presence of oxygen to yield large amount of energy. Water and carbon dioxide are also produced as a byproduct.

Glucose + oxygen → carbon dioxide + water + 38ATP

Anaerobic Respiration

It is the breakdown of glucose molecule in the absence of oxygen and produce small amount of energy. Alcohol or lactic acid and carbon dioxide are also produced as byproducts.  

Glucose→ lactic acid/alcohol + 2ATP + carbon dioxide

This process use respiratory electron transport chain as electron acceptor instead of oxygen. It is mostly occur in prokaryotes. Its main advantage is that it produce energy (ATP) very quickly as compared to aerobic respiration.

Steps involve in anaerobic respiration are:

Glycolysis

Glycolysis is the first step of both aerobic and anaerobic respiration. It involve the breakdown of one glucose molecule into pyruvate and 2ATP.

Fermentation

The second step of anaerobic respiration is fermentation. It involve the fermentation of pyruvate into lactic acid or alcohol depending upon the organism in which it is taking place. There is no ATP produced, however carbon dioxide is released in this step.

Everything around us undergoes some changes. The changes can be either physical or chemical. The cutting of hair is an example of physical change.

What is physical change?

The physical change is defined as the type of change in which the physical properties of matter such as colour, state of matter, odour, solubility, etc. change. During this change neither the composition nor the chemical nature of the substance is changed.

In a physical change the molecules rearrange among themselves without affecting the internal composition. The chemical property of a substance is not affected by the physical change. But in chemical change the chemical composition of the matter change.

When you cut your hair, some of it is removed it is still your hair. The hair is altered somehow but remains the same substance. Hence it is a physical change. Other examples are cutting paper, melting of ice, etc.

Thus cutting your hair is a physical change.

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The correct statement is a single replacement reaction takes place because zinc is more reactive than hydrogen. Hence, option C is correct.

What is a chemical equation?

A chemical reaction is a representation of symbols of the elements to indicate the number of substances and moles of reactant and product.

A single replacement reaction takes place because zinc is more reactive than hydrogen.

Reaction

Zn+2HCl ⇒ ZnCl₂ + H₂

If we look at this reaction, the elements that play a role are those that undergo a redox reaction

Oxidation : Zn⇒Zn²⁺ + 2e

Reduction : 2H⁺ + 2e ⇒H₂

So Zn (located on the left) can push H (the element on the right) in the redox reaction ⇒ Zn is more reactive

A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds.

A+BC⇒AC+B

So the above reaction involves the elements Zn and H which undergo a redox reaction and are included in a single replacement.

Hence, option C is correct.

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Answer: The correct statement is a single replacement reaction takes place because zinc is more reactive than hydrogen.

Explanation:

A single displacement reaction is defined as the chemical reaction in which a more reactive metal displaces a less reactive metal from its chemical reaction. The reactivity of metals is determined from the series known as reactivity series.

The metals which lie above in the reactivity series are more reactive than the metals which lie below in the series. General equation for these reactions is given as:

where, A is more reactive metal than metal B.

Now, when zinc metal reacts with hydrochloric acid, it leads to the production of zinc chloride salt and hydrogen gas. The equation follows:

Here, zinc is more reactive metal than hydrogen because it lies above in the series.