Naja Ellis answered
You mean the Circumference and Area of a circle: Circumference is defined by: C = 2*pi*r So C = (2)(22/7)(3.5ft.) C = 22ft. Circumference can also be looked at as perimeter. That means If you walked all the way from starting point to that point again, that would be circumference or perimeter. Area is theRead more
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Naja Ellis answered
Again the question says show me an object with four lines of symm
etry: Not a reference to it: I will up load the square and then illustrate possible other objects so you are familiar on how to do this on your own.
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Naja Ellis answered
There are five if it is a true pentagon...the picture that I will upload is a good but not excellent representation of a pentagon...but it ref
lects the answer to your question. I hope this helps.
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Naja Ellis answered
If you want to graph Y = 1/2x -2 first understand what the equation means...Y is the value for any given value of x times 1/2 -2 so for x = 1, y = 1/2(1) -2 = 1/2 -2 = -1 1/2  also note that the equation fits the form of Y = mx + b … Read more
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Naja Ellis answered question
The name of a solute-solvent combination is a SOLUTION. Solutes are usually solids that are dissolved by a solvent that the solute is soluble in to make a SOLUTION!.
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Naja Ellis answered question
An oxygen molecule is actually diatomic, an oxygen atom has the count of 16 protons and 16 neutrons. So an oxygen molecule contains two nucleii bringing the proton count to 32 and the neutron to 32, so the as a molecule it has a molecular mass of 32. Oxygen atoms that are unbonded are elements … Read more
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Naja Ellis answered
One of the most important properties of solutions is evaporation,
is that its vapor pressure lowers (or the number of solvent molecules in gaseous
form decreases) as more solute(salt)is added. In addition to the lower vapor pressure
at the start, as the solvent evaporates, this effect becomes more andRead more
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Naja Ellis answered question
The color that all items appear are the colors they reflect back at you. When a piece of clothing is observed and it looks red or green any color. These colors are the colors that are not absorbed but reflected. … Read more
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Naja Ellis answered
The specific heat capacity is usually denoted as Cp or Cv and used as this :

Cp = heat absorbed/increase in temperature per gram(J/Co x gm.)can also be expressed in moles (J/Co x gmMW)(gm MW of substance/moles of substance.) = Cp in units of moles. And this is at constant pressure; the … Read more
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Naja Ellis answered
1 1/5 as a percent:

6/5 x 100 = %

1.2 x 100 = 120 % look at the answer to se if it makes sense in a case like this one. With this problem you could almost look at this as two parts.

(1 x 100) + (1/5 x 100) = … Read more
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Naja Ellis answered
We scientist use statistics to not only analyze data to see if it is statically within certain tolerable error limits, to know how good your data is. To know how your technique is, if experimental error is ruled out , then one can determine the contribution of human error to an experiment. Reproducible data is … Read more
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Naja Ellis answered
The function of CO2 in  our lives is immeasurable:

Humans use carbon dioxide in many different ways. The   most familiar example is its use in soft drinks and beer, to make them   fizzy. Carbon dioxide released by baking powder or yeast makes cake batter   rise.
Some fire extinguishers use … Read more
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Naja Ellis answered
Calculate the [OH-] = 1.6 x 10 -3 M Sr(OH)2

(Ksp= 3.2×10-4 at 25 °C) A moderately strong hydroxide.

If I use the reaction: Sn(OH)2 --> Sn+2 + 2OH- then in an 1.6 x 10 -3 M solution of Strontium hydroxide the concentration of [OH-] = 2 x 1.6 xRead more
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Naja Ellis answered
There are three isomers:

pentane : Straight aliphatic hydrocarbon CH3CH2CH2CH2CH3 Five carbons in length.

Iso-butane or 1-methyl butane  CH3CHCH2CH3
CH3

2,2 dimethyl
-propane   CH3
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Naja Ellis answered
The easiest and the way you cannot loose is to multiply the number by a fraction = to one.

for instance: 4/4 x 71 = 294/4   or 3/3 x 71 = 213/3 these are technically called fractions. And the fraction retains its past value of 71..I think this is what you are looking for.
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Naja Ellis answered
I would say in between 78-87. That is the average weight for a 10 yr. Old girl who is 54 inches tall.

A 10 year old  (female) child who is 85 pounds  and is 4 feet  and 6 inches tall has a body mass index of 20.5, which is at the 87th percentile, and would indicate that … Read more
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Naja Ellis answered
I think that "we" as in now are dying whether the earth is here or not. If "we" are available meaning alive:

I have heard it best in this manner:

If you die the world will probably go on as if nothing happened, it will effect your immediate family.

But, if the … Read more
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Naja Ellis answered
I will discuss the definition of pH and the relationship with the hydrogen ion[H+] supplied by an acid.

By the way: [H+] = moles of [H+]/ 1liter.

Then I will give you one easy and one hard example why the pH equation cannot be your only way of determining whether a substance is … Read more
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