Answer:
Subscripts are small numbers that tell us the number of each type of atom in a compound
If there is no number stated then it automatically means there is one atom present
Coefficients are big numbers in front of formulas that tell us we have more than 1 molecule present
Using the example of 2H₂O
The coefficient (2) multiplies the number of atoms of each element in this formula. For hydrogen 2 × 2 = 4 hydrogen atoms and 2 × 1 = 2 oxygen atoms
Write the symbols for the cation and the anion: Mg and Cl.
Determine the charge on the cation and anion. If the cation has a Roman numeral after it, that is the charge on that cation. ...
Determine formula.
Answer:
Q = 43,000 calories = 180,000 joules = 180 Kilojoules
Explanation:
Heat flow for phase change can be defined as Q = m·ΔHv
ΔHv = Heat of Vaporization for water = 540 calories/gram = 2259 joules/gram = 2.259 Kilojoules/gram
m = mass of object of interest ( in this problem 80 grams steam 100°C converting to 80 grams of water at 100°C
Q = m·ΔHv = 80g x 540 cals/g =43.200 calories x 4.184 joules/cal = 180,748.8 joules (calculator answer) => 180,000 joules (2 sig. figs.) = 180 Kj
Answer:
Electrons repel each other due to electrostatic force of attraction between both of them as a result prevent the electron from entering the nucleus preventing it from collapsing