Search: chemistry - significan digits

Number of results: 94,060

chemistry - significan digits
Thank-you, That's what I thought to for #2...
Saturday, May 10, 2008 at 11:45am by Sarah

Math
It depends on if you are considering significan digits. I don't know what you are doing. If you are using significant digits, then the first is 3.9 and the second is 14 Without knowing what you are doing, yes, you are probably correct. This seems like an innane assignment...
Monday, July 6, 2009 at 11:56pm by bobpursley

chemistry - significan digits
#1) Complete the following calculation by providing the correctly rounded answer in SI Units: 6.25 g divided by 8.25 g/mol #2)You are using a scale that has an accuracy of 0.01g. Suppose you have been told that one raisin has a mass of 1.011 g and you measure the other 9 ...
Saturday, May 10, 2008 at 11:45am by Sarah

Math
a) digits can repeat number of cases = single digits + double digits + .. + 7digit numbers = 7 + 7^2 + 7^3 + ... + 7^7 a geometric series, with a = 7, r = 7 , n = 7 sum = 7(7^7 - 1)/(7-1) = 960799 b) repeats are not allowed single digits --- 7 double digits, choices = C(7,2...
Sunday, October 21, 2012 at 12:15pm by Reiny

math
single digits 1-9 or 9 --- 9 digits used double digits 10-99 or 90 using 2 digits each gives us --- 180 digits used for doubles triple digits 100 - 999 -- 900 using 3 digits each , 900x3 = 2700 used for triples number of digits used for 4 digits numbers = 4553 - 9 - 180 - 2700...
Friday, May 7, 2010 at 8:12pm by Reiny

math
x has 3 digits. the tens digits is half the hundreds digits. the number is odd.the sum of the digits is 9
Monday, November 23, 2009 at 7:07pm by hamza

maths
1) is what I get too. 2. a) I agree with 69 as well. 63 digits will get you to p36. Another 66 digits will get you another 33 pages. b) When I calculate this, I get 204 digits for 104 pages: 9 digits for 1-9 180 digits for 10-99 15 digits for 100-104 I think you're ...
Tuesday, October 20, 2009 at 12:07am by jim

Algebra
The second one: 2+3+5+7+11+13+17+19+23+29+31+37+41+43+47+53+59+61+67+71+73=712 Matt The fourth one: 2-9=8 digits 10-99=178 digits 100-200=300 digits 201-300=297 digits 301=3 digits 302=3 digits 303=3 digits 304= 3 digits 8+178+300+297+12= 795 304 pages
Wednesday, December 5, 2012 at 8:32pm by Cassandra

MATH 7
0.25 and the choices they gave me was A. 2 digits B. 4 digits C. 1 digits D. 5 digits
Sunday, June 17, 2012 at 10:15pm by KEVIN

chemistry - significan digits
Divide 6.25/8.25 = ?? There are three significant figures in each; therefore, you are allowed three in the final answer by the multiplication/division rules. #2. I can interpret the question two ways. IF I KNOW, because someone told me, that EACH raisin had a mass of 1.011 ...
Saturday, May 10, 2008 at 11:45am by DrBob222

algebra
Digits are individual numbers. 123 has three digits, 1, 2 and 3. Braces {} are used to designate a set of digits.
Tuesday, August 10, 2010 at 10:00pm by PsyDAG

chemistry-light
the SI Unit of length is meter,which is defined as the lenght equal to 1,650,763.73 wavelengths of light of the light emitted by a particuar energy transition in krypton atoms.calculate the frequency of the light to three significan figures.
Thursday, November 3, 2011 at 12:03am by nja

math
A locker combination has three nonzero digits, and digits cannot be repeated. The first two digits are 1 and 2. What is the probability that the third digit is 3?
Thursday, February 7, 2013 at 9:51pm by Anonymous

Math
A locker combination has three nonzero digits, and digits cannot be repeated. The first two digits are 1 and 2. What is the probability that the third digit is 3?
Tuesday, May 3, 2011 at 5:51pm by Jess

math
1. a door code is made up of six unique digits the last digit is 8. 2.oddd and even digits alternate(o is even) 3.the difference of the adjacent is always bigger than 1. 4.the first 2 digits (reads as one number)as well as he two middle digits(as one number) are multiples of ...
Wednesday, July 16, 2008 at 10:26am by tony

MA112
there are 4 even digits only 1 digit, 5 , is divisible by 5 (although you could make an argument for 0) 1, 3, 5 , 7 or four digits are prime 1,3,5,7,9 or 5 digits are odd so 4*1*4*5 = 80
Saturday, March 9, 2013 at 11:59am by Damon

Math
A locker combination has three nonzero digits, and digits cannot be repeated. The first two digits are 1 and 2. What is the probability that the third digit is 3? would this be 1/7 or 1/6? i'm unsure.
Wednesday, May 22, 2013 at 4:07pm by bubbie

discrete math
How many strings of four decimal digits (Note there are 10 possible digits and a string can be of the form 0014 etc., i.e., can start with zeros.) (a) have exactly three digits which are 9s?
Tuesday, April 3, 2012 at 9:06pm by carlton

Math
120 Are the last two digits divisible by 4 Are the last three digits divisble by 8 Are the sum of the digits divisible by 9 1048 Are the last three digits divisible by 8
Thursday, April 15, 2010 at 7:16pm by Scott

Chemistry
Right on the prodedure. However, how did you get five significant digits in the answer when your moles had only three significant digits?
Friday, September 5, 2008 at 9:56pm by bobpursley

Chemistry
I would assume three significant digits on this. work it out to three digits.
Friday, March 18, 2011 at 8:57pm by bobpursley

Math
I am a number less than 40,000. All my digits are multiples of 3. My first,third,and fifth digits are the same. both my thousands digits and my tens digit are six more than the others.
Thursday, May 9, 2013 at 8:51pm by Michael Taylor

Math
The difference between my digits is 7. When you divide me by the sum of my digits, the quotient is the sum of my digits. That makes me a perfect you know what! Which number am I?
Tuesday, December 4, 2012 at 9:16pm by Joshua

Chemistry
The digits are right. I would round it to 23 since you have only two significant digits in the 6.5%. But 23 what? grams. mL. ounces. pounds.
Wednesday, February 6, 2008 at 9:32pm by drbob222

statistics
For 100 consecutive day frequencies of occurrence of the digits 35,35,30 for the digits 1,2,3 at .05, can you reject the hypothesis that the digits are from a uniform population?
Wednesday, May 2, 2012 at 7:58pm by Michael

Math
What do the digits in the number 15 add up to? Answer 1+5=___. Using single digits, how many different ways can you add up to 6?. Example: The least number of digits is 2, and it is 1+5=6. The greatest number of digits is 6, and it is 1+1+1+1+1+1=6. 1.How many other numbers ...
Sunday, March 21, 2010 at 3:38am by Mohammed

math
A 4-digit number. The sum of its digits is 18. The last two digits are 5 times as much as the first 2 digits. The hundreds and ones places have the same digit.
Thursday, October 18, 2012 at 8:32pm by Braden

Riddle
"IT" refers to a four digit number, composed of two identical "PERIODS" of two digits each. The four digits add up to 20, so the two digits in each period add up to 10 (two even or two odd digits). However, the question requires that the difference of the ...
Thursday, November 18, 2010 at 8:41pm by MathMate

Math
It there were 99 pages, the number of digits used would be 9 (with one digit) + 2x90 (with two digits) = 189. Each additional page will require 3 digits, and you need 621 more digits. That requires 207 more numbers. That would make the number of pages 306. Check my thinking.
Tuesday, February 26, 2008 at 10:10pm by drwls

Math
I am a six digit number. Two of my digits have the values 300 and 4000. All the digits in my thousands are the same. The remaining digits are also the same and their sum is the 10.
Tuesday, June 19, 2012 at 9:15am by Enzo

math
In general, the digits inside of each number should be descending from left to right, since the left-most digits have a multiplier of 100. So 8 and 9 occupy the left-most digits, and 4 and 6 the second. Pair 4 with the greater digit, i.e. 9, and 6 with the smaller (8). Proceed...
Wednesday, September 22, 2010 at 6:11pm by MathMate

math
If it has to be greater than 700000, the first digit must be 7. That leaves us with 5 digits 2,2,2,4,4 to make the remainder of the number. Here we have 5 digits of which 2 and 3 are identical, so the number of ways to choose the 5 digits is C(5,3,2) = 5!/(3!2!) I'll let ...
Tuesday, May 24, 2011 at 9:39pm by MathMate

math
using digits 1-9 only once, multiply a 3 digit by a 2 digit number and get a 4 digit result 12*345=4140? looks ok to me. the answer would have to be 6789 or some order of those digits if you used the others in the question. digits 1-9 used only once, no zeroes. The digits can ...
Tuesday, November 28, 2006 at 8:38pm by Trey

math
(1)I am thinking of a 5-digit odd number. (2)The sum of all its digits is 20. (3) The digits in the hundreds place and in the tens place are consecutive numbers. When you multiply the digits in the tens and hundreds places, you get the digits for the thousands and ten-...
Friday, September 23, 2011 at 3:10pm by Johnny

maths
The product of the digits of a positive two-digit number exceeds the sum of the digits by 39. If the order of the digits is reversed, the number is increased by 27. Find the number.
Monday, May 6, 2013 at 10:39am by hemant

math
(b) the digits of a positive integer having three digits are in A.P and their sum is 15. The number obtained by reversing the digits is 594 less than the original number. Find the number. If the three digits are in A.P. (arithmetic progression) and the sum is 15, the middle ...
Wednesday, September 23, 2009 at 3:27pm by MathMate

Physics
calculate the following, expressing the answer in scientific notation with the correct number of significan figures: (8.86 + 1.0 * 10^-3) / 3.610 *10^-3 2454.57?
Sunday, February 15, 2009 at 2:12pm by y912f

number theory
You use that when computing Modulo 9 you have: 10 = 1 So, 10^n = 1^n = 1 This means that Modulo 9 the numerical value of a digit is the same as the sum of its digits. Then if you take a number N and subtract the number that has the digits in reverse order M, then Modulo 9 this...
Sunday, April 19, 2009 at 2:51pm by Count Iblis

Math
Peter wrote an even number between 32 and 54. The sum of the digits is 7. The tens digits is greater than the ones digits. What number did Peter write?
Tuesday, August 28, 2012 at 6:49pm by Anonymous

Math
Since the sum of all 4 digits is only 6, and all digits are different, the smallest combination of digits that can be used is 1, 2, 3, 4 but that sum is already 10 There can be no such number.
Sunday, February 19, 2012 at 12:49am by Reiny

math
I am thinking of a two-digit number in which the sum of the digits is 9 and the number is even. These clues alone do not create one answer. Add one more clue so that there is only one answer. Both digits are divisible by 2. The difference of the digits is 2. Both digits are ...
Friday, October 26, 2012 at 7:09pm by Christina

MTH213 -
The possible tens digits are in the first column; the possible ones digits are in the second column. 9 - 5 8 - 4 7 - 3 6 - 2 5 - 4 4 - 0 Which set of digits meets the other criterion?
Wednesday, January 19, 2011 at 2:00pm by Ms. Sue

math: probability
A locker combination has three nonzero digits, and digits cannot be repeated. If the first two digits are even, what is the probability that the third digit is even?
Thursday, March 27, 2008 at 5:05pm by Brooke

math
Any of the ten digits 0 through 9 may be used in a 6-digit code, but no digit may be used more than once. If the first two digits are 1 and 7, what is the largest possible average of all 6 digits? a)4 b)6 c)6.5 d) 7
Thursday, April 18, 2013 at 10:20pm by sammy

College Mathematics
Counting principles and permutations. A social security number consists of 9 digits. How many different social security numbers are possible if repetition of digits is permitted. digits 0-9
Monday, March 18, 2013 at 2:09pm by slomomo

physics conversions check my answers
All of them are wrong, considering significant digits. One cannot take a three digit number and convert it to a more precise number. The last number 0.88atm, is two sig digits, you converted it to a precision of five digits. Otherwise, the numbers have been manipulated in the...
Monday, January 28, 2008 at 11:20pm by bobpursley

math
Can u please help me with this..this is my sons 6th grade work and im pulling my hair out..i would like to know how to do it so he does not think or his teacher that im an idiot... Thank You So Much -The mystery # is a decimal.. -The digit in the 1's place is less then ...
Monday, September 22, 2008 at 6:38pm by nikol

grade six math
I am a number between 7 million and 8 million. All my digits are odd. All the digits in my thousand period are the same. All the digits in my units period are the same. The sum of my digits is 31. What number am i
Thursday, September 13, 2012 at 8:53pm by taesia

math (brainteaser)
There are 9 digits on pp 1-9 There are 90 digits on pp 10-99 That's 99 digits before page 100 The rest of the pages have 3 digits each. 555-99 = 456 456/3 = 152 So there are 99 + 152 = 251 pages
Thursday, October 20, 2011 at 10:46am by Steve

Math
The mystery number's tens digit is less than the ones digit. The tens digit is less than the tenths digit. The tens digit is even. Its ones digit divided by its tens digit is 5. The product of two of the digits is 6 It has two odd digits. One of its digits is the sum of ...
Tuesday, September 25, 2012 at 10:26pm by Gene

intermediate algebra
First comment. In scientific notation, one should pay attention to significant digits, the 8.4 is two sig digits, which makes the answer only to two digits, not three. 8.4/5.97 *106-2 you can do the math.
Saturday, July 9, 2011 at 8:35am by bobpursley

Math (Reiny)
Regarding my question below, when the question talks about digits 0-7 do we include the 0. In other words, are the possible digits 0,1,2,3,4,5,6,7 or 1,2,3,4,5,6,7? Thanks again for your help. How many odd four-digit numbers, all of the digit different can be formed from the ...
Wednesday, January 5, 2011 at 9:44pm by Ann

math
The sum of the digits must be 11. These digits could be 29 or 92 38 or 83 47 or 74 56 or 65 If you multiply those digits, which ones have a product of 24? Which one has a tens digit greater than the ones digit?
Tuesday, October 2, 2012 at 6:11pm by Ms. Sue

Physics
eff= 1-330/520=36.5 percent, not counting significant digits. I only see two sig digits in the temps. 37 percent using two sig digits.
Wednesday, February 11, 2009 at 9:53pm by bobpursley

Math: Need IMEDIATE help
8/81 = .098765432 ... The repeating group is 9 digits 2012/9 = 223 remainder 5 So, the 9 digits repeat 223 times making 2007 digits, and the 2012th digit is the 5th digit of the group = 6
Thursday, January 19, 2012 at 11:20am by Steve

math
Posted by nicole on Monday, September 22, 2008 at 4:32pm in response to math. Can u please help me with this..this is my sons 6th grade work and im pulling my hair out..i would like to know how to do it so he does not think or his teacher that im an idiot... Thank You So Much...
Monday, September 22, 2008 at 4:46pm by nicole

Math
I form a 3-digit number at random from the digits 1-9. What is the probability that my number has no repeated digits? All three digits the same? Exactly one repeated digit?
Monday, November 12, 2012 at 9:56pm by Kay

Chemistry
please check my answers for the following questions. 1) when a measurement that has six significant digits is divided by a measurement that has three significant digits, how many significant digits should the answer have? ANSWER: 2 2) How many hydrogen atoms are in 5 molecules...
Tuesday, July 31, 2007 at 9:28am by anonymous

MATH
Need Answer to the Following Please: Using the 9 digits, 1, 2, 3, 4, 5, 6,7, 8 and 9 you can arrange four different digits to form a four-digit number that is NOT divisible by 7. The digits 1238 cannot be arranged to create a four-digit number that is divisible by 7. The ...
Tuesday, March 6, 2012 at 7:34pm by Please Help Me

data management
from the digits 0,1,2,3,4,5,6,7,8,9 find the number of a) 4-digit numbers with repetition of digits b) 4-digit numbers without repetition of digits c) the number of odd 4-digit numbers with no repetition of digits d) the number of even 4-digit numbers with no repetition of ...
Saturday, January 19, 2008 at 10:58pm by Lisa

Data management
from the digits 0,1,2,3,4,5,6,7,8,9 find the number of a) 4-digit numbers with repetition of digits b) 4-digit numbers without repetition of digits c) the number of odd 4-digit numbers with no repetition of digits d) the number of even 4-digit numbers with no repetition of digits
Friday, January 18, 2008 at 11:03pm by Lisa

math
If 200<n<300, then the first digit must be 2. That leaves 4 digits for each of the remaining digits for a total of m=1*4*4*4 numbers. If there is no limitation, the number of all possible (distinct) numbers is N=4^4. The probability that a number formed by the ...
Wednesday, June 6, 2012 at 8:24pm by MathMate

Math
Mr. Digit wanted to assign a number to each student in his class. He could only use the digits 2,3,and 6 and each student's number had to have three digits. Can he find enough numbers for all 25 students if repeated digits are allowed? Will there be any extra numbers?
Thursday, December 10, 2009 at 4:38pm by fko

math
The last two digits must be a multiple of 5 of a two digit number; The first two digit number is 10. So the last two digits can be 50, 55, 60, 65, . . . If the last two digits are 50 then the number is 1050 1155 1260 1365 1470 1575--this is the first number where the hundreds ...
Thursday, October 18, 2012 at 8:32pm by Anonymous

math
as many as 4. If one number has fewer digits than the other, it's smaller. The number with the smaller first digit is smaller. If the first digits are the same, go on (3987,3762) similarly for the 2nd, 3rd, 4th digits
Monday, August 27, 2012 at 8:08pm by Steve

Problem Solving
There were 1024 pages in the book, here is my reasoning The number of single digit pages is 9, each one using 1 digit for a total of 9 digits each the number of double digit pages is 90, (9x10), each page using 2 digits for a total number of digits of 180 the number of 3 digit...
Wednesday, November 14, 2007 at 7:35am by Reiny

4th grade
Mr. Digit wanted to assign a number to each student in his class. He could only use the digits 2,3 and 6 and each student's number had to have three digits. Can he find enough numbers for all 25 students if repeated digits are allowed? Will there be any extra numbers?
Monday, January 11, 2010 at 12:36pm by jessica

math
the binary system is used for computer programming. a binary number consists of a string of digits that are either 0s or 1s a. if a string of binary code is 5 digits long, how many binary numbers are possible if the first digit is a 1? b. how many different binary numbers can ...
Tuesday, January 4, 2011 at 5:01pm by Anonymous

math
There must be such a formula, but it will depend upon how many digits are in the number, and what the initial digits are. From n = 0 to 9, if n is the largest number, the sum of digits is n(n+1)/2 From n = 10 to 19, in n is the largest number and you include the sum for digits...
Tuesday, May 12, 2009 at 2:59pm by drwls

4th grade
it is between 1 and 2 maillion. The first three digits are the same. The least possible digit is in the thousands place. The greatest possible digit is in the ones place. the hundreds digits is 1 more than the tens digit. The sum of the digits is 21.
Sunday, December 12, 2010 at 11:39pm by Elizabeht

math
i am a number between 7 000 000 and 8 000 000 all my digits are odd all the digits in my thousands period are the same all the digits in my units period are the same the sum of my digits is 31 what number am i ?
Tuesday, October 27, 2009 at 5:01pm by jeff

math
1)a number of two digits is such that the digits is 11 and the number is 27 greater than the number obtained by reversing the digits. a)Find the number b)State the advantages of the mean as an average 2) use logarithm tables to evaluate to five significant figures (23,9*78....
Friday, March 15, 2013 at 5:32am by John Makotamo

math
What is the number? It has seven digits. The value of one of its digits is 600. Two of the digits in the thousands period are 7's and the third one of them has a value of 3 x 10,000. The digit withe greatest place value in the number is between four and six, and the digit ...
Monday, November 7, 2011 at 9:18pm by shawnna

Math Help Please
Can you Please explain the answer that I received of 2469? It is the correct answer but I do not understand how to show the work. Thank you *************************************** Using the 9 digits, 1, 2, 3, 4, 5, 6,7, 8 and 9 you can arrange four different digits to form a ...
Friday, March 9, 2012 at 6:00am by Urgent Please Please

Math
Received answer to the following question from Jishka. (2469) Would you please explain the steps you used to get the answer 2469. I must show work. Thank you Using the 9 digits, 1, 2, 3, 4, 5, 6,7, 8 and 9 you can arrange four different digits to form a four-digit number that ...
Thursday, March 8, 2012 at 11:42pm by Urgent Help Please

Math
Using the 9 digits, 1, 2, 3, 4, 5, 6,7, 8 and 9 you can arrange four different digits to form a four-digit number that is NOT divisible by 7. The digits 1238 cannot be arranged to create a four-digit number that is divisible by 7. The digits 1389 also cannot be arranged to ...
Monday, March 5, 2012 at 8:54pm by Please Please Help

Math
number of cases with no repeating digits = 9x8x7 = 504 number of cases where digits repeat = 9x9x9 = 729 so prob(no repeating digits) = 504/729 = 56/81 all 3 digits repeat, could be 111 , 222, .. 999 or 9 of them prob = 9/729 = 1/81 I am not clear what you mean by "...
Monday, November 12, 2012 at 9:56pm by Reiny

Maths
I am a two-digit number greater than 50. The product of my digits is not 12, but 12 goes into it exactly. The sum of my digits is odd. The sum of my digits is less than 13 What am I? What am I if I am less than 50?
Monday, April 23, 2012 at 12:20am by Anonymous

Geometry
9 1-digit 9 2-digits ... 9 20-digits Looks like 180
Thursday, May 16, 2013 at 8:00pm by Steve

probability
if digits can't be repeated, how many 4-digit numbers can be arranged using the digits 1, 3, 5, 7, and 9?
Tuesday, May 10, 2011 at 11:06pm by kristy

MATH
IS THERE AN EASY WAY TO MULTIPLY TRIPLE DIGITS BY DOUBLE DIGITS?
Wednesday, September 5, 2007 at 4:20pm by TEYA

math
Each student's number has 3 digits, and there are 3 possible digits (2, 3, and 6). How many possibilities are there?
Monday, January 11, 2010 at 3:30pm by Marth

math
24005 has 5 digits. 8999 has four digits.
Thursday, September 18, 2008 at 6:42pm by Ms. Sue

math
what is the smallest number that can be formed using the digits 4,9,2,1,3,0 and 5 without repaiting any of the digits?
Friday, June 22, 2012 at 4:59am by joy

Math
The page numbers in a book use 810 Digits. If the book starts with page #1 how many pages are in the book. I think it's a trick question, because digits is underlined. Is the answer 810? What does it mean by uses 810 Digits?
Tuesday, February 26, 2008 at 10:10pm by Tyler

math - eh?
Hey! 5 million only has 7 digits. How are we going to use all digits 0-9?
Monday, September 17, 2012 at 3:38pm by Steve

Math
If A, B, and C stand for different digits, and BA+AC=BCA, what digits do A, B, and C represent? Please Help!
Monday, February 13, 2012 at 10:46pm by Beth

Math
If A, B, and C stand for different digits, and BA+AC=BCA, what digits do A, B, and C represent? Please Help!
Monday, February 13, 2012 at 10:25pm by Beth

Probability
How many different three-digit numbers can be formed using the digits 1,3,5,7 and 9 if the digits may be repeated?
Sunday, June 5, 2011 at 12:26pm by Andrew

Math
What is the least possible product for digits 1, 3, 5, 6, and 7 using all digits only once?
Tuesday, May 17, 2011 at 6:20pm by Anonymous

math. help please!!
Using only the digits 0 an 1, how many different numbers consisting of 8 digits can be formed?
Wednesday, July 14, 2010 at 11:50pm by sha

probability
How many 3 digit odd numbers can be formed with the digits 1 thru 9, if no digits is repeated in any number?
Wednesday, October 7, 2009 at 11:03pm by Sharon

math
What am I? I have four digits is 1. The product of my digits is 0
Monday, April 22, 2013 at 5:35pm by justin

math
The sum of my digits is the same as the product of my digits who am I?
Tuesday, October 13, 2009 at 6:26pm by Jenny

singapore moth
Place the following digits in the boxes so that the sum of the digits in each straight line is the same. This is like a crossword 3 boxes across and 3 boxes down then 3 boxes across and 3 boxes down using digits 1,2,3,4,5,6,7,8,9. please help with answer.
Sunday, November 4, 2012 at 1:34pm by lori

maths
1) If I number the pages os a 36 page book, how many digits do I write? My answers is 63, not sure if this is the correct answer? 2) How many pages does a book have if in numbering them I use: a) 129 digits? A= 69 pages? b) 203 digits? A= 104 pages? Could you please check my ...
Tuesday, October 20, 2009 at 12:07am by Brendon

Data Mangement- Math
Paula moves to an area with a different telephone exchange. Telephone numbers in the new exchange start with 753, and all combinations of the four remaining digits are equally likely. a) Calculate the probability that the last four digits in Paula’s new telephone number ...
Sunday, April 21, 2013 at 4:39pm by Maame

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