CHEM ch.5 - Electrolytes, Electroplating, Molar Mass
What occurs after going through beta decay?
The number of protons of an atom increases
What is the electron configuration for an element with an atomic number of 17?
1s^2 2s^2 2p^6 3s^2 3p^5
What represents an isotope of a neon, Ne? 21/10Ne 21/9Ne 21/11Ne 21/8Ne
21/10Ne - the bottom number is the atomic number, the atomic number of neon is 10.
What is the Molar mass of magnesium oxide, MgO 24.3 grams 24.3 moles 32. grams 40.3 grams
40.3 grams
One mole of anything is how many?
6.02 x 10^23 (Avogardo's number)
Witch substance do you predict will dissolve in water, why? Al(s) SiO(s) Cu(s) CaCl2(s)
CaCl2(s) - Calcium is a metal and Chlorine is a nonmetal, when they are combined they are ionic and have the ability to dissolve in water.
What type of metals does aqueous lithium chloride have? Will it conduct electricity?
Contains metals (lithium) and nonmetals (chloride), when dissolved in water it will conduct electricity.
Based on their chemical structures, which is most likely to be SOLUBLE in water? Cu(s) copper CuSO4(s) copper sulfate Al(s) aluminium SiO2(s) pure sand
CuSO4(s) copper sulfate - copper and aluminum are metals that don't dissolve in water and pure sand does not dissolve in water . Copper sulfate dissolves in water.
What group of compounds will emit similar colors if heated in a flame? group 1: CuSO4, BaSO4, MgSO4 group 2: K2SO4, KCl, BaCl2 group 3: Li2SO4, BaSO4, LiCl group 4: BaSo4, BaCl2, Ba(NO3)2
Group 4: BaSo4, BaCl2, Ba(NO3)2 - all of the compounds first elements are Ba, which emits the color green
What type of bonding in found in zinc chloride, ZnCl2(s)?
Ionic - when metals (zinc) and nonmetals (chloride) are combined they become ionic
If the chemical formula for lithium chloride is LiCl, what formula do you predict for potassium chloride?
KCl - both Li and K are in the group 1A family of metals
What element has this electron configuration [Ne] 3s^2 3p^1? lithium, Li boron, B sodium, Na aluminum, Al
aluminum, Al
What type of bonding holds ethanol, C2H6O together?
covalent - ethanol is a sugar (glucose) and are held together by covalent bonds
What does not conduct electricity? 1. the human body 2. salt dissolved in water 3. pure water 4. copper wire
pure water
