Chemistry Help?

Question

I don't get how to name the type of reaction
how to provide teh products and teh name and formula
Al(s)+S(s)----? would the product be AlS(s), direct combination???
Zn(s)+H3PO4(aq) would it be single replacement ZnPO4+H3 but i don't know the aq or s
calcium hydroxide is added to hydrochloric acid
CaOH+HCl---CaCl+H2O would it be double replacement but also don't know the aq or s
Add sodium oxide into water
NaO+H2O----????no idea

Answer 1

lets attack this one at a time.

Al (s) + S (s) honestly probably would not form a new compound as both are solids. If one is aqueous then it will go. The product of those 2 elements will be Al2S3 and yes Direct combo. This is a case where yoou need to know how to do the lewis dot structures for the elements and then hos to combine them. Theses are also metal + nonmetal so its an ionic bond.

ok Zn(s) + H3PO4(aq) would be the products you predicted, exceot that H3 doesn't exist. it would be H2 and then the equation would need to be balanced. Zn has a +2 charge and the PO4 has a -3 so subscripts are needed. the Zn3(PO4)2 would either be Aq or S and the H2 would definately be a gas, and yes single replacement. ( You have one single element and a new compound as products)

Ca(OH)2 + HCl --> CaCl2 + H2O
Ca(OH)2 would most likely be Aq and HCl is (aq). The CaCl2 is most likely a (s) and the H2O is (l). yes double replacement because the + ions in each of the reactants change places and there are 2 compounds as products.

NaO + H2O --> most likely NaOH and H2... this would not fall into any of the 4 main categories of types of reactions. it comes closest to double. NaO (aq) H2O (l) NaOH (aq) H2 (g)

hope this helps a bit.. been a year since ive taught this topic, will get to it again in about 6 weeks.

Answer 2

Al (s)+ S (s) --> AlS (s) Direct Combination or Composition since it involves the combination of two elements/ an element and a compound/two compounds to form a salt or in other words, given a general formula A+B-->AB

Zn (s)+ H3PO4 (aq) --> Zn+PO4 +H2 Single Replacement since the more active element in the equation (in this case, according to the activity series, Zn is more active than H) replaces the less active element in a compound. Given a general equation: AB+C--> AC+ B. H3 become H2 as once it is replaced, H3 will become an element and since H is a diatomic molecule, it is written as H2.

CaOH +HCl -->CaCl +H2O Double Replacement as the elements from each respective compound would simply replace the each other. In a general equation: AB+CD --> AD+ BC

NaO+H2O --> Na(OH) Direct Combination to form a salt. I can't give a proper explanation since all i have is are general equations of possible types of given elements/compounds and the products they're apt to form. Still, the latter is a direct combination/composition.

If you want all the general equations for prediting products, i can email them to you

p.s. if the form of matter ( s, l, g, aq, etc) isn't given in the word equation, it isn't required to write it down but your teacher may not follow this so i'm not sure... and btw, the answers i gave you aren't balanced yet

Merry Christmas! Good luck!

Answer 3

Al(s) + S(s) ----> Al2S3(s)
If both of these reactants are solid, it is very possible that the product will be a solid. Al ion has the charge of +3 whereas S ion has -2. In order to balance both the electronic charge, you need 2Al(3+) to make it to +6 and 3S(2-) to make it to -6... +6-6 = 0... Therefore, Al2S3.

Zn(s) + H3PO4(aq) ---> Zn3(PO4)2 (aq) + H2(g)
This is an Acid-Metal Reaction which gives of the metal salt and hydrogen as products. So, write H2 first and then ur salt by combining the metal with the negatively charged ion from acid.
Same as above, you have to balance the charge between 2 ions to write a formula of the substance. Zn = +2, PO4 = -3... Hence you need 3Zn(2+) and 2PO4(3-).
H2 is hydrogen which appear in gaseous state.
Now, balance the equation. You will get
3Zn(s) + 2H3PO4(aq) ---> Zn3(PO4)2 (aq) + 3H2(g)

calcium hydroxide is not CaOH because Ca has the charge +2 and OH -1. So you need 2OH-. It's Ca(OH)2.
Ca(OH)2(s) + HCl(aq) ---> CaCl2(aq) + H2O(l)
Ca(OH)2(l) + HCl(aq) ---> CaCl2(aq) + H2O(l)
Neutralisation.
First of all, you must identify the state of Ca(OH)2 whether it is a liquid or solid. It's impossible that it will be in aqueous state as Ca(OH)2 is insoluble in water. HCl must be in aqueous because acid only shows its acidic properties in the presence of water.
For neutralisation, just exchange both the ions with each other and balance their charge. After balancing, balance the equation and you will get
Ca(OH)2(l) + 2HCl(aq) ---> CaCl2(aq) + 2H2O(l)
Ca(OH)2(s) + 2HCl(aq) ---> CaCl2(aq) + 2H2O(l)

NaO(s) + H2O ---> is there such a reaction? Sorry but I have no idea.

Answer 4

Al(s) + S(s) --> Al2S3 (s)
~combination reaction

3Zn(s) + 2H3PO4(aq) --> Zn3(PO4)2(aq) + 3H2 (g)
~single replacement

Ca(OH)2(s) + 2HCl (aq) --> CaCl2 (aq) + H20 (l)
~double replacement or neutralization

Na2O(s) + H20 (l) --> 2Na+ (aq) 2OH- (aq)
~acid-base reaction

Watch your formulas, you have to take into account the charge on the ions. For example, you wrote CaOH, but calcium has a +2 charge while OH has a -1 charge. For a neutral molecule, the charges must balance.