What impact does CO2 in the atmosphere on us and the earth?


Answer 1
Answer: CO2 that we produce helps the trees but other non natural CO2 cills the earths atmosphere and ozone layer.

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Which of the following is a result of a change in pressure? A. Oxidation
B. Frost wedging
C. Exfoliation
D. Chemical feathering


The answer would be c
The answer is B have a good day 

One molecule of caffeine contains 8 atoms of carbon, 10 atoms of hydrogen, 2 atoms of oxygen, 4 atoms of nitrogen. write the formula for caffeine with the elements in the order they are given.


The chemical formula of caffeine is as follows: C8H10O2N4.


The chemical formula of a compound is a representation of the different atoms that constitute that compound, including the number for the each atom.

According to this question, one molecule of caffeine contains 8 atoms of carbon, 10 atoms of hydrogen, 2 atoms of oxygen, 4 atoms of nitrogen.

This means that the chemical formula of caffeine compound will be written as follows: C8H10O2N4

Learn more about chemical formula at:


The molecular formula of the caffeine is:


Caffeine is an organic molecule which is composed of carbon, hydrogen , oxygen and nitrogen. It is generally found in tea leaves sand coffee beans.

One molecule of caffeine contains :

Number of carbon atoms = 8

Number of hydrogen atoms = 10

Number of oxygen atoms = 2

Number of nitrogen atoms = 4

The molecular formula of the caffeine is:


In a controlled experiment, the factor tested is called the A. constant. B. independent variable. C. dependent variable. D. control.


In a controlled experiment, the factor tested is called the .

Further Explanation:

A procedure that is performed in order to support, disprove or validate a hypothesis is known as an experiment. A hypothesis is an idea or thought that needs to be tested with the help of experiments.

Types of experiments:

1. Controlled experiments

The type of experiment that is used for comparing the results of experimental samples with the control samples is called a controlled experiment. Such experiments involve a drug trial. The experimental group will be the one that receives the drug and the other one receiving regular treatment will be the controlled group. The experimental group is also known as the treatment group. Another example of controlled experiments is the protein assay.

2. Natural experiments

These are also called quasi-experiments. These are performed by exposing individuals to the conditions that are governed by nature. Experiments involving weather changes and natural disasters are examples of natural experiments.

3. Field experiments

These are quite different from the experiments performed in the laboratory. Such experiments are usually performed in social studies. These have higher external validity as compared to normal lab experiments. Economic analysis of health and education are some examples of such experiments.

The variable that can be changed by the investigator is called the independent variable while the variable is the one that is affected by the changes in experimental conditions. All the variables in a controlled experiment are kept constant; except for the factor that is to be tested. Such a factor is called the independent variable or the experimental variable.

Learn More:

  1. What is the main purpose of conducting experiments?
  2. What is the percentage error in the experiment?

Answer Details:

Grade: Senior School

Chapter: Keys to studying chemistry

Subject: Chemistry

Keywords: experiment, hypothesis, controlled experiment, natural experiment, field experiments, dependent variable, independent variable, quasi-experiments.

C. Dependent Variable

The substance that gets broken down in a homogeneous mixture is the (A)colloid (B)solution (C)solvent (D)solute


The answer is D. solute.
Hope this helps!
Hope it helped!

NEED HELP ASAP!!!!!!! The Periodic Table is arranged in order by which classification?
mass number

atomic number

nuclear weight

isotope type


Considering the defintion of atomic number, the Periodic Table is arranged in order by atomic number.

What is atomic number

All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged (electrons).

The atomic number indicates the number of protons that are present in the nucleus of an atom.

The atomic number allows you to organize the known elements in the Periodic Table, going from the smallest to the largest number of protons in the nucleus as you go through the rows and columns of the table.

So, each chemical element in the periodic table is characterized by having the same number of protons (Z). However, the same chemical element can have different numbers of neutrons.


In summary, the Periodic Table is arranged in order by atomic number.

Learn more about atomic number and the Periodic Table:

Hey there!

The Periodic Table is arranged in order by which classification?

Answer: Option A. mass number

Hope this helps
Have a great day (:

Diamonds and graphite are made of this element


Diamonds and graphite are both made of carbon
They're both made out of carbon

1.What percent of light passes through the sample if its absorbance A=2? 2. For the best calibration curve, the transmittance values (%T) should fall within the range from 10% to 90%. What is the approximate range of corresponding absorbance values?

3. What is the absorbance of the solution if the percent transmittance for it is 10%?


1. The formula for absorbance is given as:

A = log (Io / I)

where A is absorbance, Io is initial intensity, and I is final light intensity


log (Io / I) = A

log (Io / I) = 2

Io / I = 100


Taking the reverse which is I / Io:


I / Io = 1 / 100

I / Io = 0.01


Therefore this means that only 0.01 fraction of light or 1% passes through the sample.


2. What is meant by transmittance values is actually the value of I / Io. So calculating for A:


at 10% transmittance = 0.10

A = log (Io / I)

A = log (1 / 0.10)

A = 1


at 90% transmittance = 0.90

A = log (Io / I)

A = log (1 / 0.90)

A = 0.046


So the absorbance should be from 0.046 to 1


3. at 10% transmittance = 0.10

A = log (Io / I)

A = log (1 / 0.10)

A = 1


What common household product when mixed with bleach can produce dangerous chemical fumes? A. ammonia
B. baking soda
C. dish soap
D. windshield washer fluid


The common household that when mixed with bleach can produce dangerous chemical fumes is ammonia.When ammonia is mixed with bleach, the chemical reaction between the two produces chloranamine which is a toxic gas when ingested. answer then to this problem is A


Answer of this question is A

the common household product ammonia when mixed with bleach produces dangerous fumes due to the chemical reactions forms in between these two products forms toxic acids.


List 3 scenarios for a substance being classified as a weak acid


1. Acetic acid - Vinegar
2. Phosphoric acid - Used in cola (pop)
3. Hydrofluoric acid - Used as a solvent for molten aluminum  

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