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Q: When writing a number in scientific notation how many digits should be to the left of the decimal point?

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It allows you to express a large number in a much smaller set of digits.

2It could be 3. The only way to be sure is to use scientific notation.6.4x102 is two significant figures6.40x102 is three significant figures

4. All numbers before the first digit don't count. All numbers after the first digit for decimals do count.all digits shown in scientific notation are significant.

With no decimal point, it is 2.

pH is the negative log of the hydrogen ion concentration.You first have to know decimal notation. This is a way of expressing mixed number using a decimal point. The position of the number behind the decimal point determines the inverse decimal power of the denominator of the fractional part. That is .1 means 1/10, .01 means 1/100, .001 means 1/1000, and so on. having an infinite string of such power fractions enables you to express any fraction.eg. 23.87459503 means 23 plus 8/10 plus 7/100 plus 4/1,000 plus 5/10,000 plus, 9/100,000 plus, 5/1,000,000 plus 3/100,000,000You then have to know scientific notation. This is a way of expressing very larger or very small numbers in decimal notation. What scientific notation does is relieve the significant digits from having to hold positional values. For example the number 5600000000000 needs all those zeros to show the true value of the number as position is important. In scientific notation this importance is expressed by simply stating the number of zeros. The number above in scientific notation is 56E11. The numbers right of the E simply stating how many zeros there are to be - or more accurately the number of zeros to the left of the decimal point.knowing this taking, the base 10 logarithm of any number that is multiple of 1 and 10 only (anything more complex and for now you will have to look up finding logarithms yourself) is just taking the number after the E in the scientific notation form of the number.knowing this you now have to know how to express chemical concentration. If you had 5 parts of hydrogen Chloride in one liter of water you could say that you have 5 parts per liter. If you use the proper scientific unit of parts (the mole) you can express this is scientific short hand [HCl]= 5, concentration of HCL is 5 moles/liter.Now ph is only concerned with the concentration of the Hydrogen ion. (a simplistic explanation that will do for this question) And what ph is - is the negative log of the Hydrogen ion concentration.So if you had a hydrogen ion concentration of .01. [.01]In scientific notation that is [1.0E-2]Taking the negative log of the Hydrogen ion concentration give ph=2[.0000001]= [1E-6] ph=6

Related questions

One

One digit

There should be exactly one digit.

If you want to have it in standard format, only one.

One: no more and no fewer. And it cannot be a zero.

In scientific notation, you should have only one digit to the left of the decimal point.

Only one non-zero digit.

There should be 1 non-zero digit.

Only one digit. The mantissa must be in the interval [1, 10).

Writing a string of random digits is a proper waste!

Just remember that there is one digit to the left of the decimal in scientific notation. All the other digits go on the right of the decimal. Then find an appropriate power of ten to write the rest of the number. Your 3,400 in scientific notation is 3.4 x 104in scientific notation.

Only on digit may be to the left of the decimal point. The mantissa must be a number in the interval [0, 10).

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