Chemistry, 23.07.2020 01:01 sindy35111
Finally, a rule of thumb for rounding off numbers in which the digit to be dropped is a 5 is
always to make the last digit of the rounded-off number even:
1.35 = 1.4
1.25 1.2
1. Express the following quantities in scientific notation and indicate how many significant
figures each has
(a) 12,200 (b) 12.200.0 (c) 0.003040
2. Express the following quantities in standard decimal form and indicate how many signif-
icant figures cach has.
(a) 1 34 x 10$
(b) 1.340 X 10-2
(c) 0.00420 X 106
3. How many significant figures would the solution of each of the following problems have?
What are the solutions of (c) and (d)?
(a) (5.74)(38.27) (0.001250) (c) 1.000 + 10.2
(b) (1.76 X 100.12 x 10-6) (d) 18.76 – 7
4. Round off each of the following numbers to three significant figures.
(a) 1465 (b) 13.35 (c) 1.765 X 10-1
5. When the value of a number is given, the significant figures provide an indication of the
unccrtainty in the value for example, a value of 2.7 indicates that the number lies between
2.65 and 2.75. Give ranges within which each of the following values lie.
(d) 2500
(b) 4.30
(e) 2.500 X 103
(1.778 x 10-
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Answers: 3
Chemistry, 22.06.2019 04:40
Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)
Answers: 2
Chemistry, 22.06.2019 04:40
*will mark you brainliest + 15 points ** why does the equilibrium of a system shift when the pressure is increased? a. to maximize the stress on the system b. to stop restoring equilibrium to the system c. to increase the total moles of gas in the system d. to decrease the total moles of gas in the system
Answers: 3
Chemistry, 22.06.2019 07:30
In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect of increasing the pressure?
Answers: 1
Finally, a rule of thumb for rounding off numbers in which the digit to be dropped is a 5 is
always...
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