Vocab!
If all the atoms in a substance has the same identity it becomes a/an ____?
Element
SI Unit for Temperature
Kelvin
100.0 and 100 has how many significant figures respectively
Balance the equation:
C3H8 + O2 ---> CO2 + H2O
1 C3H8 + 3 O2 ---> 5 CO2 + 4 H2O
How does increasing temperature affect the rate of reaction?
Speeds up the reaction
What is a type of mixture with particles that are larger than those in solutions, but not heavy enough to settle out
A colliod
What happens at Absolute zero at the molecular level?
All kinetic motion stops
How many significant digits are in 23,000?
4 Significant figures
How many valence electrons are in an atom of chlorine?
7
Is energy absorbed or released in an endothermic reaction?
absorbed
Scattering of light by colloidal particles is called the ____ Effect
Tyndall Effect
What is 98K in degrees Celsius?
(Celsius = Kelvin - 273)
Answer: -175 degrees Celsius
Round 234,555,359 to three significant figures
2.35 × 10^8
Balance the equation:
H2 + O2 -----> H20
2 H2 + O2 ----> 2 H20
Feels slippery; acid or base?
Base!
Define the law of conservation and mass
The mass of all substances that are present before a chemical change equals the mass of all the substances after the change
What is 25 degrees Celsius in Kelvins?
(Kelvin = Celsius + 273)
Answer: 298K
12.5849 mg + 2.4 mg =
15.0
C2H4 + 3 O2 ----> 2 CO2 + 2 H2O
If you start with 45 grams of ethylene (C2H4), how many grams of carbon dioxide will be produced?
141.4 g CO2
pH < 7 ; acid, base, or neutral?
Acid!
The Kinetic Theory
Explanation of how particles in matter behave
32 degrees Fahrenheit in Kelvin
(subtract 32, multiply by 5, divide by 9, then add 273.15)
273.15
The length ℓ, breadth b and thickness t of a block of wood were measured with the help of a measuring scale. The results with permissible errors are
ℓ= 15.12 ± 0.01 cm, t = 5.28 ± 0.01 cm. b= 10.15 ±0.01 cm.
The percentage error in volume up to proper significant figures is :
0.36%
How many atoms are in 1 mole?
1 mole = 6.02 x 10^23 atoms/molecules
HOW does a catalyst affect a chemical reaction?
A catalyst speeds up a chemical reaction by finding an alternate pathway with a lower activation energy.