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