CHEMISTRY MIDDLE SCHOOL

Answer quickly plzzzz 100 pointsWhat are the two types of genetic molecules, contained in living things, that the bases formed from formamide make?

Nucleobases and Nitrogen

Hydrogen and Oxygen

DNA and ATGC

DNA and RNA

Answers

Answer 1
Answer:

Answer:

hydrogen  and oxygen

Explanation:
Answer 2
Answer:

Answer:

DNA AND ATGC

Explanation:

SORRY IF ITS WRONG

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How do light technologies typically produce color images?A) by manipulating the angles at which light enters a lens
B) by energizing light waves with electric currents
C) by combining light of different frequencies
D) by concentrating light into a very small range of wavelength

Answers

How do light technologies typically produce color images? Light technologies typically produce color images by manipulating the angles at which light enters a lens. The answer is letter A.

Answer:

C) By combining light of different frequencies. Hope this helps!

the relative molecular mass of sodium hydroxide is 40. if 60 grams of sodium hydroxide are dissolved in water how many moles will there be in the solution?

Answers

The formula to find the amount of moles of a substance used is: actual mass divided by relative molecular mass. 

Therefore,
60/40 = 1.5 moles

The accepted value for the percent by mass of water in a hydrate is 36.0%. In a laboratory activity, a student determined the percent by mass of water in the hydrate to be 37.8%. What is the percent error for the student's measured value?(1) 5.0% (3) 1.8%

(2) 4.8% (4) 0.05%

Answers

The original or accepted value for the percent by mass of water in a hydrate = 36%
Percen by mass of water in the hydrate determined by the student
in the laboratory = 37.8%
So the difference between the actual and the percent by mass in water determined by student = (37.8 - 36.0)%
             = 1.8%
So the percentage of error made by the student = (1.8/36) * 100 percent
                                                                             = (18/360) * 100 percent
                                                                             = ( 1/20) * 100 percent
                                                                              = 5 percent
So the student makes an error of 5%. Option "1" is the correct option.

Answer:

5%

Explanation:

A closed container is filled with oxygen. The pressure in the container is 205 kPa
What is the pressure in millimeters of mercury?
Express the pressure numerically in millimeters of mercury.

Answers

Answer:

so pressure in millimeter Hg will be 3016.5 mm Hg

Explanation:

Our solar system consists of the sun, planets, moons, asteroids, rock particles, dust, and gases that orbit the sun. From a scientific perspective, which makes the solar system a system?

Answers

A solar system is made up of objects that interact with one another 
The sun and planets makes our solar system 

1. a change of matter (substance) from one form to another without a change inchemical properties

Answers

So,

There are two basic types of changes in chemistry: physical changes and chemical changes.

Physical changes do not change the chemical identity of the substance; instead physical changes operate between molecules/atoms/ions/etc.  Changes of phase and separation of different substances in a mixture are examples of physical changes.  For example, when you change the phase of liquid water to gas, you are operating between the water molecules by breaking the intermolecular attractions.  Yet you still have water, H2O.  When you separate iron filings from a mixture of sand and iron filings with a magnet, you are, in a way, operating between the atoms of iron.  Yet you still have iron and sand.

Chemical changes change the chemical identity of the substance.  When you throw salt into water, the salt dissolves and is no longer salt.  You get salt water, which is chemically different from water and salt.  You have operated inside the salt compound.

Thus, changing matter from one form to another without a change in chemical properties would be a physical change.
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