Sig Figs & Metric Conversions
What is the relationship between grams and micrograms?
1 g = 1 000 000 μg
which has a higher ionization energy, metals or nonmetals?
nonmetals
What is the ionic formula of the compound formed between Mg²⁺ and O²⁻ ions?
MgO
The correct answer for the addition of 7.5 g + 2.26 g + 1.311 g + 2 g is
a) 13 g.
b) 13.071 g.
c) 13.0 g.
d) 10 g.
e) 13.1 g.
a) 13 g.
if an ion is negatively charged, what is the relationship between protons and electrons?
protons < electrons
Name the ionic compound: CaCl₂
Calcium chloride
Which of the answers for the following calculations contain four significant figures?
a) 2.543 m × 100.1942 in
b) 2 L × 2.12 qt
c) 24.95 min × 0.415 h
d) 12.000 ft × 37,000 cm
e) 24.0 kg × 11.00 lb
a) 2.543 m × 100.1942 in
What is the formula and symbol for an ion with 4 protons and 2 electrons?
Be2+
What is the ionic formula of the compound formed between magnesium (Mg) and chlorine (Cl)?
MgCl2
A nugget of gold with a mass of 521 g is added to 50.0 mL of water. The water level rises to a volume of 77.0 mL. What is the density of the gold in g/mL?
19.3 g/mL
write the number of protons, neutrons, and electrons for: 50Cr3+
protons: 24
neutrons: 26
electrons: 21
Name the ionic compound: Fe₂O₃
Iron(III) oxide