Worksheetsch 3+ 4 chemistry review
Total questions: 30
Worksheet time: 20mins
express 304,000 in correct scientific notation (use E for the x 10)
(a)
Express 2.5 x 10 -3 in normal notation
(a)
Joules is the SI unit of ____
time
luminous intensity
pressure
energy
volume
150 daJ = ? cJ
(a)
a graduated cylindar is marked off by increments of .1. It contains a liquid that appears to be close to the 9 ml ine. Which one of these would be the best reading for the volume?
9 ml
9.1 ml
9.01 ml
9.001 ml
How many significant figures in 3.000?
(a)
Round 304.568 off to 4 significan figures
(a)
3.415 x 6.37= 21.75355 How should the answer to this problem be correctly rounded?
(a)
2.35 + 818.445= 820.795 How should this number correctly be rounded?
(a)
If 255 mg of a liquid is .9344 ml, what is the density of the liquid?
(a)
How many ml of solution is there in 54.44 g if the solution is 2.4 g/ml?
(a)
How many grams are there in 455 cm3 of a substance that is 7.444 g/cm3
(a)
Ashlyn estimates that a pencil is 9.85 cm long. It is really 9.66 cm long. What is her % error?
(a)
What is the symbol of tin?
(a)
Who described the atom as a uniform ball?
Democritus
Rutherford
Thomson
Dalton
What is the charge of a proton?
+
-
none
What is the approximate mass of a nuetron relative to an electron?
1349
1836
1839
1
Where are electrons located?
in the nucleus
outside the nucleus
No one knows
An atom has 47 protons and 64 nuetrons. What is the atomic number?
(a)
An atom has 6 protons and 4 nuetrons. How many electrons does it have?
(a)
An atom has 2 protons, 2 nuetrons, and 2 electrons. What is the mass number?
(a)
An atom has 10 protons and 11 nuetrons. What is the isotopic name?
(a)
Which family does sodium belong to?
(a)
cobalt is a
nonmetal
metalloid
metal
rows on the periodic table are called
(a)
helium is a diatomic element
true
false
postive ions are called (a)
anions contain (a) electrons than the atom they came from
What is the charge of an ion that has 4 electrons and 2 protons?
(a)
How many electrons would a +3 ion have if it has 8 protons?
(a)
