Which forces need to be broken to undergo a chemical change?
interatomic forces
100
What period is Cesium in?
6
200
Convert 37 C to F
°C x 9/5 + 32 = °F
98.6 F
200
How many moles are in 80 grams of CH4?
5
200
If all of the substances are given the same amount of enery which would end at the highest temperature?
Ammonia (2.1 J/g°C) Aluminum (0.9 J/g°C)
Silver (0.235 J/g°C) Water (4.184 J/g°C)
Silver
200
What bond exists between Ca and O
Ionic
200
Use the phase change diagram to answer...which is greater: heat of fusion or heat of vaporization?
Heat of vaporization
300
Which of the following is a pure substance that can't be broken down by a chemical change?
Water (H2O)
Mercury (Hg)
Propane (C3H8)
Mercury
300
Which elements have similar chemical properties to O?
S, Se, Te, Po
300
A person with a temperature of 37C holds an ice cube 0C in a room 20C. Describe the direction of the flow of the energy
From the person to the ice and air, and from the air to the ice
300
What happened to Oxygen to make a oxygen anion with a -2 charge?
O2-
gained two electrons
300
How many electrons are in a Li+ cation?
2
400
How many grams are in 4.5 kg?
4500g
400
If 2 moles of Ca(NO3)2 react, how many grams is this?
328 g
400
How much energy does it take to melt 40g of water?
Hf = 335 J/g OR Hv= 2256 J/g
13400J
400
What is the ratio of H2(g) to HF(g) in the below reaction?
F2 (g) + H2 (g) → 2HF (g)
1:2
400
The mass of the atom is determined by which two particles?
proton and neutron
500
How is 8.5 * 10^5 written in standard notation
850,000
500
What weights more? 1 mole of uranium or 10 moles of sodium
1 mole of Uranium
500
A 36g sample of water absorbs 2600J of heat, what is the temperature change of water? Cp=4.814
2600/(36*4.184) = 17.3 C
500
Balance this equation:
___ Na2CO3 + ___HCl → ___ NaCl + ___ CO2 + ___H2O
Na2CO3 + 2 HCl → 2 NaCl + CO2 + H2O
500
What is the density of a substance that weighs 45 kg and has a volume of 1L? You need to convert to g and mL first!