CHEMISTRY HIGH SCHOOL

What is the name of P3N6?

Answers

Answer 1
Answer:

Answer:

p and n

Explanation:

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Martin uses 5/8 of a gallon of paint to cover4/5 of a wall. What is the unit rate at which Martin paints in walls per gallon

Answers

Answer:

Unit rate at which Martin paints in walls per gallon is (32)/(25) wall/gallon.

Explanation:

Rate is defined as ratio between two quantities with different units.

Gallons of paint used by Martin = (5)/(8) gallons

Portion of wall Martin wishes to pint = (4)/(5) wall

Rate at which Martin paints the wall:

Rate=\frac{\text{Portion of wall covered}}{\text{Paint used}}

Rate=((4)/(5) wall)/((5)/(8) gallon)=(32)/(25) wall/gallon

Unit rate at which Martin paints in walls per gallon is (32)/(25) wall/gallon.

1. Plants use energy from sunlight, water, and carbon dioxide to produce 10 pointssugar. Which structure is found only in plant cells and helps plants capture
energy from sunlight?
A. Vacuole
B. Nucleus
C. Chloroplast
D. Cell Membrane

Answers

The answer is c chloroplast

Answer:

Chloroplast

Explanation:

Which of the following can be used to neutralize an ammonia (NH3) solution?

Answers

It really depends on your options. 
Since NH3 solution is a weak base, the option that neutralizes a base is an acid. So find an acid among your options, and here are some examples: HNO3, HCl, etc.
It would have been much better if you had attached some options to choose. But I think I've got what you mean. I bet that solution is HCl.

A person’s blood alcohol (C2H5OH) level can be determined by titrating a sample of blood plasmawith potassium dichromate solution. The balanced equation is:

16 H+ (aq) + 2 Cr2O7 2-(aq) + C2H5OH (aq) ? 4 Cr3+ (aq) + 2 CO2 (g) + 11 H2O (l)

If 35.46 mL of 0.05961 M Cr2O7 2-
is required to titrate 28.00 g of plasma, what is the mass percent
of alcohol in the blood?

Answers

Answer:

0.17%

Explanation:

With the equation:

2Cr2O7 2- + C2H5OH + H2O --> 4Cr3+ + 2CO2 + 11H2O

We can assume that every mole of ethanol needs 2 moles of Dichromate to react.

So if in 1L we have 0.05961 moles of dichromate we can discover how many moles we have in 35.46mL

1000 mL - 0.05962 moles

35.46 mL - x

x = (0.05962 * 35.46)/(1000)

x = 2,11* 10^-3 moles

As we said earlier, 1 mole of ethanol needs 2 mole of dichromate, so in the solution we have 1,055*10^-3 moles of ethanol. We can discover the mass of ethanol present in the solution.

1 mole - 46g

1.055*10^-3 - y

y = 46 * 1.055*10^-3

y = 0.048 g

To discover the percent of alchol we can use a simple relation

28 g - 100%

0.048 - z

z = (0.048 * 100)/(28)

z = 0.17%

Which characteristic would you predict from a solution that has a pH of 5?sour taste
very high concentration of hydroxide ions
slippery feeling
very low concentration of hydronium ions

Answers

Answer : The correct option is, sour taste

Explanation :

Acid : It is a substance that has ability of donating proton or hydrogen ion or hydronium ion, H^+.

The properties of an acid are :

  • Acids are sour in taste.
  • The texture of an acid solution is sticky.
  • It changes the color of the litmus paper to red.
  • It react with a metal to give compound and hydrogen gas.
  • The pH of an acid is less than 7.

Base : It is a substance that has ability of donating hydroxide ion, OH^-.

The properties of an base are :

  • Base are bitter in taste.
  • The texture of an base solution is slippery.
  • It changes the color of the litmus paper to blue.
  • It does not react with a metal.
  • The pH of a base is more than 7.

As per question, the pH is 5 that means the solution is acidic in nature and follow the properties of an acid. So, the pH = 5 has the sour taste characteristic. While the other options are the properties of a base.

Hence, the correct option is, sour taste
With a pH of five, it would mean that this substance is a weak acid one would also it expect it would be sour.

Explain the connection between Earth's magnetic field and iron.

Answers

The Earth's magnetic field is somewhat caused by the composition of the earth's core which is rich in iron minerals. There is a solid inner core that is made of iron which makes up to 2/3 of the moon's size. The charged metal of the iron produces electric currents, consequently resulting to Earth's magnetic field.

Answer:

The Earth's magnetic field is caused by how the earth's core is made. The earth's core is full of iron, especially in the inner core. That inner core is charged metal that produces electric currents that causes Earth's magnetic field. So because the core has iron, we have a magnetic field.
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