An independent variable is
a.
directly changed by the experimenter.
b.
manipulated by changes to the dependent variable.
C.
a variable that is kept constant.
d.
a variable that is used as a control.

Answers

Answer 1

Answer:

a. directly changed by the experimenter.

Explanation:

In the case of mathematical modeling, analytical modeling , and experimental sciences, the number of dependent variables based upon the amount of independent variables.

The dependent variables represent the result or outcome whose changes is being determined.

An independent variable expressed in the name form like experimental or expected variable, is a variable i.e. created in an experiment in order to verify the effect on a dependent variable

Therefore the option a is correct


Related Questions

All human body systems works together m. What would happen to someone if one of their systems becomes inefficient?

Answers

They would most likely get sick. Or suffer from organ failure. When one part of your body doesn’t work it causes a weakness, making you more susceptible to sicknesses.

Answer:

lol this is what you get for stealing my points

Explanation:

balance
Na2O+H2O → NaOH

Answers

Answer:
Na2O+H2O=2NaOH
Step by step exp.
Given:
Equation Na2O+H2O=NaOH
To find: Balance the equation
Solution:
Taking LHS of the equation
LHS=Na2O+H2O
There is 2 sodium, 2 oxygen,& 2 hydrogen
To balance the equation we have equal number of atom so we multply 2 to the RHS=2NaOH
There fore the equation form is
Na2O+H2O=2NaOH

Plz help, will give brainliest!

Answers

Answer:

C

Explanation:

No change.

The total number moles of products = The Total number of reactants

Chlorine atom
10. What does the following equation represent; 2KMnO4 -> K2MnO4 + MnO2(s)
+ O2(g) ?*
A. Oxygen turned in to carbon dioxide
B. Sulphate and lithium boiled
C. Decomposition of potassium permanganate(Heating)
D. None of the above​

Answers

Answer:

C. Decomposition of potassium permanganate(Heating)

Explanation:

The equation of the reaction is given as;

2KMnO4 -> K2MnO4 + MnO2(s)  + O2(g)

Reactant = 2KMnO4

Products = K2MnO4 + MnO2(s)  + O2(g)

A. Oxygen turned in to carbon dioxide

Incorrect option - Oxygen is not the reactant

B. Sulphate and lithium boiled

Incorrect option -  Sulphate and lithium are not part of this reaction

C. Decomposition of potassium permanganate(Heating)

Correct option - potassium permanganate decomposed to form K2MnO4 + MnO2(s)  + O2(g)

D. None of the above

Incorrect option

For the reaction, ?N2 + ?H2 → ? NH3,
What is the maximum amount of NH3 which could be formed from 12.26 mol of N2 and 2.11 mol of H2? Answer in units of mol.

Answers

Explanation:

➢number of moles. Moles and Chemical Reactions. Chapter 4. 3 H2. + N2. →. 2 NH3 ... How many grams of NH3 would form if 2.11 moles of N2 reacted with ...

the symbol between two reactants in a chemical equation?

Answers

It’s an addition sign since two things reacting means to add them up (mix them together)

Hope this helps!!

Nitric monoxide (NO) reacts with oxygen gas to form nitrogen dioxide (NO₂), a dark brown gas. If 5.895 mol of NO is mixed with 2.503 mol of O₂,

determine the limiting reagent.

calculate the number of grams of NO₂ produced.

and determine how many grams of excess reagent remain unreacted.

Answers

Answer:

Limiting reactant: O2

grams NO2 produced = 230.276 g NO2

grams of NO unused = 26.67 gNO

Explanation:

2NO + O2 --> 2NO2

Step 1: Determine the molar ratio NO:O2

molar ratio NO:O2 = 5.895: 2.503 = 2.35

stoichiometric molar ratio NO:O2 = 2:1

So, O2 is the limiting reactant.

Step2: Determine the grams of NO2:

?g NO2 = moles O2 x (2moles NO2/1 mol O2) x (MM NO2/ 1 mol NO2) = 2.503 x 2 x 46 = 230.276 g NO2

Step 3: Determine the amount of excess reagent unreacted

moles excess NO reacted = moles O2 x (2 moles NO/1 mol O2) = 2.503 x 2 = 5.006 moles NO reacted

moles NO unreacted = total moles NO - moles NO reacted = 5.895-5.006 =0.889 moles NO unreacted

mass NO unreacted = moles NO unreacted x MM NO = 0.889 x 30 =26.67 g NO unreacted

I need help with this question

Answers

Answer:

B

Explanation:

it's all about the genetics of the horse

The gametes are identical to each other and combine to make an identical organism.
True
False

Answers

Answer:

true

Explanation:

true! hope this helped!

The model below represents a molecule of ammonia gas.

Ammonia gas would be classified as?
A) element
B) atom
C) compound
D) mixture

Answers

C. Compound..........

Ammonia gas is a compound that is made up of two elements, nitrogen and hydrogen. So, option C is right.

A compound is a substance that is made up of two or more elements chemically combined. Ammonia gas is made up of the elements nitrogen and hydrogen, which are chemically combined in the ratio of 1:3.

Elements are the basic building blocks of matter. They cannot be broken down into simpler substances by chemical means. Atoms are the smallest unit of an element that can exist.

Mixtures are substances that are made up of two or more elements or compounds that are not chemically combined. The components of a mixture can be separated by physical means, such as filtration or distillation.

An atom is the smallest unit of an element that can exist and ammonia gas is not an atom because it is not the smallest unit of an element.

Therefore, option C, compound is correct.

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How many grams of oxygen were used if 3.0 moles of aluminum oxide are produced

Answers

Answer:

143.9946 g

Explanation:

Why is pathogen a better word choice than "Germ"?

Answers

Answer: because its more scientific and "formal"? I guess.

Explanation:

I NEED HELP NOWWW.!
Sexual reproduction influences genetic variation. Which of the following properly describes the influence that sexual reproduction has on genetic variation?

A) Crossing over occurs during meiosis, which results in the exchange of alleles between homologous chromosomes. This exchange of genetic material allows for the production of new combinations of alleles in gametes and an increase in genetic variation.

B) Crossing over occurs during mitosis, which results in the exchange of alleles between homologous chromosomes. This exchange of genetic material allows for the production of new combinations of alleles in gametes and an increase in genetic variation.

C) Crossing over occurs during mitosis, which results in the exchange of alleles between sister chromatid. This exchange of genetic material allows for the production of identical combinations of alleles in gametes and a decrease in genetic variation.

D) Crossing over occurs during meiosis, which results in the exchange of alleles between sister chromatid. This exchange of genetic material allows for the production of identical combinations of alleles in gametes and a decrease in genetic variation.

Answers

Answer:

C

Explanation:

The statement that best describes the influence that sexual reproduction has on genetic variation is as follows:

Crossing over occurs during mitosis, which results in the exchange of alleles between homologous chromosomes. This exchange of genetic material allows for the production of new combinations of alleles in gametes and an increase in genetic variation.

Thus, the correct option for this question is B.

What is Crossing over?

Crossing over may be defined as a biological mechanism through which genetic material gets exchanged between the non-sister chromatids of the homologous chromosomes. The process of crossing over occurs in the Pachytene stage of mitosis.

Option C is incorrect because the process of crossing over never occurs between sister chromatids. So, it is eliminated. While options A and D are incorrect because they describe the mechanism of crossing over in the sense of meiosis which is absolutely incorrect.

Therefore,  the correct option for this question is B.

To learn more about Crossing over, refer to the link:

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what is the percent yield of carbon dioxide of 2.5 mole of oxygen react and 32.4 g of carbon dioxide are produced?
please help!!

Answers

Answer:

86

Explanation:

According to the concept of percent yield, the percent yield of carbon dioxide is 72.51%.

What is percent yield?

Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.

In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .

In the given example, theoretical yield of carbon dioxide is as 32 g oxygen produces 44 g carbon dioxide,thus 32.5 g which is obtained by 2.5 moles of oxygen will require 32.5×44/32=44.68 g

Thus , on substitution in formula of percent yield, 32.4/44.68×100=72.51%.

Hence, the percent yield of carbon dioxide is 72.51%.

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How many lone pairs are in SO4 2-

Answers

Answer:

None

Explanation:

There are two S=O. bonds and two S-O bonds in sulfate ion lewis structure. Sulfur atom is the center atom and four oxygen atoms are located around sulfur atom. There are no lone pairs in the last shell of sulfur atom.

How much H2O is produced when 40000 g of
C2H, burns completely?
Answer in units of g.

Answers

Answer:

1200g H20.

Explanation:

Write out the balanced equation... when an organic compound is burned, like C2H2, it is burned in oxygen (O2) and produces Water and Carbon Dioxide (CO2)

so 2C2H2 + 5O2  =  2H2O  + 4CO2

now that you have a balanced equation just convert to moles and solve

2000g C2H2 * 1mol C2H2 / 30gC2H2 * 2mol H2O/2mol C2H2 * 18gH2O/1molH20 = 1200g H20.


Frost forming on a car's windshield is a chemical change
True or false

Answers

Answer:

True

Explanation:

The reason why is because frost is a result of a chemical reaction

Chemical Change is also known as the Non Reversible Change. ... Reversible Change is defined as changes that can be reversible. For example, frost forming on the window is Physical. It is because when the temperature goes up, the frost can melt and when it freezes, it forms a frost again

What is SiCl4 written out?

Answers

Answer:

Silicon tetrachloride

Explanation:

What is true of all mixtures?
Group of answer choices

All mixtures are made up of 2 or more elements or compounds.

All mixtures are made up of solutions

All mixtures are made up of compounds.

All mixtures are made up of elements.

Answers

Answer:

Answer the first ine made up of 2 or more.....

All mixtures are made up of two or more elements or compounds.

What are compounds?

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

Learn more about compounds,here:

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Which substance is a binary acid?
• hydrochloric acid
O phosphoric acid
• nitrous acid
O sulfuric acid

Answers

Answer:

hydrochloric acid

Explanation:

1. inside of a cell helps it to maintain its size and shape. 2. When turgor pressure inside of a plant’s cells decreases, the plant begins to 3. Plants grow upward against the downward force of gravity in a process known as 4. Even when plants are placed on their sides, they recognize the force of gravity, and their stems grow and their roots grow ** answers please its on stem scopes on Concept attainment quiz 7.7B Organism Force and Motion**

Answers

gravity
The pull of gravity has the greatest effect on which of the following in plants? The downward growth of roots. inside of a cell helps it to maintain its size and shape. A wilted plant returns to an upright position after being watered.

answer quick plssssssssss

Answers

I’m pretty sure it’s 3.14

helppp its qboutt cellsss

Answers

Answer:

sorry if this is wrong but B

Explanation:

ITS C

Oxygen, APT, and Glucose

Which of the following is NOT a combination reaction?
a NO + O2 + NO2
b Cr + Cl2 + CrCl3
C CH, + O2 + CO2 + H20
d C2H4 + H2 + C2H6

Answers

This answer should be B

true or false, the special olympics started as a backyard summer camp?

Answers

Answer:

True

Explanation:

hope this helps:)))

Why do metal boats float?

Answers

Answer:

I hope this will help you

Explanation:

The air that is inside a ship is much less dense than water. That's what keeps it floating! The average density of the total volume of the ship and everything inside of it (including the air) must be less than the same volume of water.

Please make me brilliant

Stock System naming for NaCl4, SO3, As2F4.

Answers

NaCI4: Sodium perchlorate
SO3: SULFITE ION

PLS HURRY MY TEST IS TIMED

Currently, some commercially available explosives are tagged with traceable
radioactive isotopes
chemical markers
cell-signal components
acetone compounds

Answers

Answer:chemical markers

Explanation:

I’m smart give brainlest plz

Solutions of calcium nitrate and sodium chloride are mixed.

Answers

Answer:

For example, when water solutions of calcium nitrate and sodium carbonate are mixed, calcium carbonate precipitates from the solution while the other product, sodium nitrate, remains dissolved. It is a precipitate.

Explanation:

Calculate the percent composition of oxygen in silicon dioxide.​

Answers

Answer:

then it is 5

Explanation:

because i said it is

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