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3 years ago

What is the second most abundant element in earths crust?

1 answer:

8 0

C. Silicon

EXPLANATION

Silicon is the second most common element present in the crust with an abundance of 276,900 ppm or equivalent to 27.7%. The most abundant element is oxygen with 46.6%.

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This is a model of a normal chromosome

zlopas [31]

A normal chromosome has two pairs, both the same size.

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3 years ago

What is the balanced equation for solid ammonium nitrate (NH4NO3) decomposes explosively to form nitrogen gas, oxygen gas, and w

Karolina [17]

Answer:

2NH4NO3 —> 2N2 + O2 + 4H2O

Explanation:

We begin by writing the skeletal equation as shown below:

NH4NO3 —> N2 + O2 + H2O

The equation can be balance as follow:

There are 4 atoms of H on the left side of the equation and 2 atoms on the right side. It can be balance by putting 2 in front of H2O as shown below:

NH4NO3 —> N2 + O2 + 2H2O

Now we have a total of 4 atoms of O on the left side and 3 atoms on the right side. It can be balance by putting 1/2 in front of O2 as shown below:

NH4NO3 —> N2 + 1/2O2 + 2H2O

Now, multiply through by 2 to clear the fraction as shown below

2NH4NO3 —> 2N2 + O2 + 4H2O

Now the equation is balanced

3 0

3 years ago

What evidence do you have that tpgs-750m increases the reaction rate? How does tpgs-750m act to increase the reaction rate?

notka56 [123]

TPGS-750 M conducts reaction under lower temperature then the reactions carried out in organic solvents.

It is a chemical molecule of the second generation known as an amphiphile, with both hydrophilic and lipophilic qualities.

In contrast to any other organic solvent, water is used for transition metal catalysed cross-coupling, making TPGS-750M a second generation surfactant with physical features that encourage this process.

The hydrophilic portion of TPGS-750M, which is utilised in medicine, is made of Poly(ethylene glycol), and the hydrophobic portion is made of the vitamin E compound alpha-tocopherol.

Learn more about Reaction rate here:

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7 0

1 year ago

PLEASE HELPPPPPPPP

Pavlova-9 [17]

Answer:

3 factors that are required for biodegradation are

a) Appropriate moisture

b) Oxygen supply

c) Stable condition

Explanation:

For biodegradation in a landfill, following conditions are essential –

a) Appropriate moisture

b) Oxygen supply

c) Stable condition

Contrast to above three conditions, the waste in landfill is kept dry, devoid of oxygen supply, and stirred continuously due to which the organic matter mummify instead of decomposing.

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3 years ago

Which of the statements listed below is negative aspect of a volcanic eruption?

mixas84 [53]

Answer:

C . the dramatic scenery created by volcanic eruptions attracts tourists.

5 0

3 years ago