Marcus
What is the word "Di"?
2
Put 0.000000000420 into scientific notation
4.2 x 10-10
Balance _K+_F2→ _KF
2K+F2→ 2KF
What doesn't change in a chemical reaction?
Atom and mass
What is the symbol for Bromine ?
Br
Name N4S7
Tetranitrogen Heptasulfide
List the steps of the scientific notation
1. Observation
2. Questions
3. Hypothesis
4. Prediction
5. Experiment
6. Analyze results
7. Conclusion
What is the skeleton equation for the reaction that takes place when solid magnesium combines with nitrogen gas to form magnesium (II) nitride?
Mg(s)+N(g)→ Mg3N2
How many ions are in NaOH?
2
4.5x10^8+6.2x10^7
5.12x10^8
HBr
Hydro Bromic Acid
How many joules are equivalent to 5,124 kcal?
21,438,816 joules
How many molecules are in 4.6 L of oxygen?
1.24x1023 molecules of oxygen
What is the density at STP for NH3?
0.76 g/L
List the number of protons, neutrons, and electrons of the Chemical element with an atomic number of 50 and an atomic mass of 119
P:50,E:50,N:69
What is BS?
Boron(2)sulfide
List the rules for naming scientific figures
- non zeros always count
-leading zeros never count
-captive zeros always count
-trialing zeros only count if its a decimal
What is the empirical formula of a molecule with 67% carbon, 3% hydrogen, and 30% oxygen?
C3H2O
How many atoms are in 0.075 mol in titanium?
4.5 x 1022 atoms
What is the molar mass of HNO3
63.02g
HCLO3
Chloric Acid
How mach heat is required to raise the temperature of 592g of Silver by 73° C? (AU specific heat = 0.129 j/g OC)
q= 5,574.864
How many grams of carbonate are needed to produce 70 g of magnesium?
CO3 + MgSe → Mg + CO3Se
172.8 g Mg
What would be the percent yield if 9.9 g Pb(NO3)2 is heated to get 5.5 grams of PbO?
82%
A student estimated a mass to be 180g, but by carefully measuring it, found the actual mass to be 230g. What is the percent error ?
21.7%