Basics
Dalton theorized that atoms are indivisible and that all atoms of an element are identical. We now know that:
Atoms are divisible.
The correct name for the N-3 ion is the:
nitride ion
How many hydrogen atoms are in 4 molecules of isopropyl alcohol, C3H7O?
28
When the equation Fe + O2 → Fe2O3 is balanced, the coefficient for O2 is:
3
The SI unit of heat and energy is:
joule
All atoms of the same element have the same:
number of protons
A formula that shows the lowest whole-number ratio of ions in an ionic compound is called a(n):
empirical
The chemical formula of aspirin is C9H8O4. What is the mass of 0.200 mol of aspirin?
36.0 g
The equation H3PO4 + 3KOH → K3PO4 + 3 H2O is an example of which reaction?
double replacement
How many calories are required to raise the temperature of 75.0g of water from 20℃ to 50℃?
2250 cal
An atom of an element with atomic number 48 and mass number 120 contains how many protons, neutrons, electrons
48 protons, 48 electrons, and 72 neutrons.
What is the formula for sulfuric acid?
H2SO4
What is the volume (in liters at STP) of 2.50 mole of carbon monoxide?
56.0 L
In order for the reaction 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g) to occur, which of the following must be true?
Al must be above H on the activity series
The temperature of a 6.0-g sample of glass changed from 20°C to 45℃ when it absorbed 550 J of heat. What is the specific heat of this glass sample?
3.7 j/gC
The atomic mass of an element depends on what?
Number of isotopes of that element, the mass of each isotope of that element, and the relative abundance of each isotope.
Do metals in Groups 1A, 2A, and 3A gains or lose electrons?
Lose electrons
How many moles of SO3 are in 2.4x1024 molecules of SO3?
4.0 moles
A double-replacement reaction takes place when aqueous K2SO4 reacts with aqueous Pb(NO3)2. You would expect one of the products of this reaction to be:
KNO3 NaPb Pb(SO4)2 CNO3
KNO3
The enthalpy of a system is the same as its:
specific heat
heat of reaction
heat of combustion
heat content
heat content