Unit 1: Science as a Verb
Using the rules for significant figures, the sum of 0.027 gram and 0.0023 gram should be expressed as:
0.029
Matter is defined as anything that occupies space and has
mass
A Ca2+ ion differs from a Ca atom in that the Ca2+ ion has
fewer electrons
Avogadro's Number:
6.02 x 1023
Which groups are part of the p-block?
13-18
In the laboratory, a student determined the atomic mass of an element to be 28.02. The accepted value is 28.086. What is the difference between the student's observed value and the accepted value, expressed to the correct number of significant figures?
0.07
What two things are considered pure substances?
Elements and compounds
An atom of an element has the electron configuration 2-4. What is the total number of valence electrons in this atom?
4
The total number of calcium atoms in 80.0 grams of calcium is:
1.20 x 1024
These elements produce 2+ cations
Alkaline Earth Metals
Which substance can not be decomposed by a chemical change?
1) carbon monoxide (CO)
2) carbon dioxide (CO2)
3) methane (CH4)
4) carbon (C)
4) Carbon (C)
Construct a particle diagram which displays: a mixture of elements
The diagram shows: two or more types of particles, monatomic or diatomic. All particles consist of only one type of element.
What is the electron configuration for Be2+ ions? (use s,p,d,f notation)
1s2
Daily Double!
Given the reaction: 2CO + O2 > 2CO2, what is the minimum number of moles of O2 required to produce one mole of CO2?
Which part of the Periodic Table contains elements with the greatest metallic properties?
lower left
The mass of a solid is 3.60 grams and its volume is 1.8 cubic centimeters. What is the density of the solid, expressed to the correct number of significant figures?
2.0 g/cm3
When sugar is dissolved in water, the resulting solution is classified as a:
Homogeneous mixture
Neutral atoms of 35-Cl and 37-Cl differ with respect to their number of:
Neutrons
When the equation
__C8H16 + __O2 >__CO2 + __H2O is correctly balanced using the smallest whole number coefficients, the coefficient of O2 is:
12
Daily Double!
The amount of energy required to remove the loosest-held electron
273 K and 1 atm
What is Standard Temperature and Pressure (STP)
Burning is an example of a change that is:
Chemical
A sample of element X contains 90. percent 35X atoms, 8.0 percent 37X atoms, and 2.0 percent 38X atoms. The average isotopic mass is closest to:
35 amu
Given the reaction:
Cu + 4HNO3 > Cu(NO3)2 + 2H2O + 2NO2
What is the total mass of H2O produced when 32 grams of Cu are completely consumed? (to the nearest whole number)
18
Two properties of non-metals:
brittle, non-lustrous, poor conductors of heat & electricity, high electronegativity, high first-ionization energies