1/2 L of swamp water (or tap water with mud or dirt added)
2 L soda pop bottle with its lid
2 L plastic soda pop bottle—cut in half (have an adult help with cutting)
1000 ml beaker
2 20 oz cups
1 tbsp alum (aluminum potassium sulfate)
2 c fine sand
1 c coarse sand
1 c small pebbles
1 filter paper or coffee filter
1 rubber band
1 large spoon for stirring
spoon for scooping the alum
stopwatch or timer
The thermochemical equation is the chemical equation including the net change of enthalpy (heat).
The chemical equation for the decomposition of methanol to form methane and oxygen is:
2CH3OH --> 2CH4 + O2
The thermochemical equation is:
2CH3OH ---> 2CH4 + O2 - 252.8 kJ
Note that the heat is placed as negative at the right side because it is absorbed during the decomposition, so the environment will have 252.8 kJ less per each mole of O2 produced.
You can equivalently write:
2CH3OH + 252.8 kJ --> 2CH4 + O2
Answer:
A. Superposition
Explanation:
A law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.
Answer:
50 g NaOH
General Formulas and Concepts:
<u>Chemistry - Solutions</u>
- Reading a Periodic Table
- Using Dimensional Analysis
- Molarity = moles of solute / liters of solution
Explanation:
<u>Step 1: Define</u>
0.500 L
2.50 M NaOH
x moles of solute
<u>Step 2: Define conversions</u>
Molar Mass of Na - 22.99 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of NaOH - 22.99 + 16.00 + 1.01 = 40 g/mol
<u>Step 3: Find moles of solute</u>
2.50 M NaOH = x moles NaOH / 0.500 L
x = 1.25 moles NaOH
<u>Step 4: Convert</u>
<u />
= 50 g NaOH
<u>Step 5: Check</u>
<em>We are given 3 sig figs. Since our final answer has 2 sigs, there is no need to round.</em>
