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Definition
Unit Conversion
Sig-Fig
Write Formula
Naming
100
What is the difference between accuracy and precision?
Accuracy: how close a measurement is to the actual value precision: how close the measurement in a series are to on another
100
convert 345m into mile 1 miles = 1.61km
0.214 miles
100
How do you add/subtract, multiply/divide sig-fig numbers?
add/subtract = count the least number of decimal places multiply/subtract = count the least number of sig figs
100
(a)Cu2+and Br1 (b) Fe2+and O2-
CuBr2 FeO
100
(a)K2S (b)CaO
potassium sulfide calcium oxide
200
What are two kind of chemical bonds? give me the definition and example of it
1. ionic: transfer electron ( metal+ non metal) 2. Covalent bond: sharing electron (between non metal)
200
convert 8 milligrams to kilograms
8.0 × 10-6 kilograms
200
State the number of sig. figs. in each of the these numbers. (a) 353 (b) 0.072 (c) 3.040 (d) 3000
(a) 353 3 sig.figs. (b) 0.072 2sig.figs., the leading zeros in a decimal are not significant. (c) 3.040 4sig.figs., the zeros between the numbers are significant and also the last zero in a t decimal is significant. (d) 3000 1sig.fig.,the trailing zeros in a whole number are not significant.
200
(a)sodium and sulfur (b)magnesium and chlorine
Na2S MgCl2
200
Na2O2
sodium peroxide
300
What is difference between intensive property and extensive property? Also, what are the example or those?
Intensive- independent of the amount of substance Extensive- dependent on the amount of substance ex) mass, volume density
300
convert 101.7 Fahrenheit to Kelvin.
311.8K
300
(a) 2.7+10.846 (b)4.56-2.8
(a)13.5 (b)1.8
300
sodium carbonate
Na+1 and CO3-2 Na2CO3
300
P4O10
tetraphosphorus decaoxide
400
what are three types of chemical formulas? Define and give example of each one
1. empirical: shows relative number of atoms 2. molecular: shows actual number of atoms 3. structural: shows the bonds between them
400
convert 34mi/s into cm/h 1 miles = 1.61 kilometers
1.97*10^10 cm/h
400
(a) 3.185×0.49 (b) 0.485 ÷ 0.0638
(a) 3.185 × 0.49 (2 sig.figs.) You can use a calculator to multiply the numbers. 3.185 × 0.49 = 1.56065 We want the answer to 2sig.figs. In 1.5|6065, 1 is the first sig.fig. 5 is the 2nd sig.fig.The number to the right of 5 is 6, which is more than 5, so we round up the number. The answer is 1.6 (b) 0.485 ÷ 0.0638 (3 sig.figs.) You can use a calculator to divide the numbers. 0.485 ÷ 0.0638 = 7.6018808 We want the answer to 3sig.figs. In7.60|18808, 7 is the first sig.fig, 6 is the 2nd sig.fig, 0 is the third sig.fig. The number to the right of 0 is 1, which is less than 5, so we round down the number. The answer is 7.60
400
calcium nitrite
Ca+2 and NO2-1 Ca(NO2)2
400
CaCr2O7
calcium dichromate
500
What is Dalton's Atomic Theory? Name all 4 postulates
1. all matter consists of atoms 2.atoms of one element can not be converted into other element 3. atom of an element are identical in mass and other properties 4. compounds result from the chemical combination of specific ratio of atoms of different element.
500
convert 45nanograms/L to megagrams/mL
4.5 × 10-17 megagrams / mL
500
(36.1+0.9) * 0.23 * 6.838
58
500
potassium perchlorate
K+1 and ClO4-1 KClO4
500
Mg(H2PO4)2
magnesium dihydrogen phosphate