Chemistry - help please!!!

[Pen]

I’m trying to look over my son’s homework. He thinks he has done many wrong, but I cannot recall how to do these problems at all.  

I’m going to try to photo link the pages, and as well as letting me know if the homework is okay as is or needs to be redone, maybe someone could steer me to a website that reviews how to do these. 

TIA!!!

 

[Arcadia]

Khan has a section on names and formulas of ionic compounds https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties#names-and-formulas-of-ionic-compounds

For checking of the second worksheet, I use this https://pubchem.ncbi.nlm.nih.gov/compound/Copper_II_-phosphate or chemspider http://www.chemspider.com

I did not look at the entire first photo. For the second photo, what was obvious was the lowercase Z and N for zinc oxide ZnO https://pubchem.ncbi.nlm.nih.gov/compound/ZINC-oxide, hydrogen nitrate 

HNO3 (his is wrong, tell him to look at 2nd row H, 9th column NO3 on first photo) ETA: this link is useful too https://chemed.chem.purdue.edu/genchem/topicreview/bp/ch2/names.html

 

Edited January 18, 2020 by Arcadia

[Dicentra]

I went through and noted the ones he got incorrect (and attached them as PDFs).  Remind him that when he's combining positive and negative ions into a compound, he will be criss-crossing the charges (and dropping the signs) to get the subscripts for the formula of the compound.  Also remind him that when he has to write a subscript after a polyatomic ion, he can't distribute the subscript through the brackets.  For example, if I were to combine a magnesium ion with an acetate ion, it would look like this:

Mg²⁺       C₂H₃O₂^1-

Mg(C₂H₃O₂)₂

It also looks like he's just doing some of it quickly and missing things that he knows how to do. 🙂

The links Arcadia gave are good.  I think he's got the basic idea - he just needs to slow down a bit and think about what he's doing. 🙂

image.thumb.jpg.98f74e57c9c6a7c6583a18a0fb716766.pdf image.thumb.jpg.96394197b3278ee12eac86f73f3bca96.pdf

Edited January 19, 2020 by Dicentra

[Pen]

@Arcadia and @Dicentra   Thank you both, so much!!!   

Ds has dysgraphia and I’m not sure how hard I should push him on upper/Lower  case issues (don’t know if teacher will give him a bit of leeway on that or not)— but he clearly needs to slow down and think as far as the criss-crossing etc goes.

The word “criss-cross” helped bring back to my mind the essence of this sort of problem.  

 I think I am going to start by asking my son to walk me through how such problems are done in a “please teach me” sort of way.   I think he may be more receptive to that than to telling him what to do.  Then if he doesn’t remember we’ll go to the sites. 

[Dicentra]

35 minutes ago, Pen said:

@Arcadia and @Dicentra   Thank you both, so much!!!   

Ds has dysgraphia and I’m not sure how hard I should push him on upper/Lower  case issues (don’t know if teacher will give him a bit of leeway on that or not)— but he clearly needs to slow down and think as far as the criss-crossing etc goes.

The word “criss-cross” helped bring back to my mind the essence of this sort of problem.  

 I think I am going to start by asking my son to walk me through how such problems are done in a “please teach me” sort of way.   I think he may be more receptive to that than to telling him what to do.  Then if he doesn’t remember we’ll go to the sites. 

You're welcome!  Glad it helped. 🙂  Naming and formula writing involves going slowly and being nit-picky - both of which are not always high on a teen's priority list when doing homework. 😉   I think your plan of having him "teach" to you is a great one!

[Arcadia]

2 hours ago, Pen said:

Ds has dysgraphia and I’m not sure how hard I should push him on upper/Lower  case issues (don’t know if teacher will give him a bit of leeway on that or not)— but he clearly needs to slow down and think as far as the criss-crossing etc goes.

 

Chemistry instills patience. Can’t rush through work or labs. Hard on a teen though so he has my sympathies.

Are his teachers aware of his dysgraphia? In general most teachers would be compassionate about uppercase/lowercase issues but he might get points reduced in exams. I’ll go with gentle reminders rather than pushing.

I think the worksheet in photo one is too much busywork though and that would lead to careless mistakes. It’s like filling up a multiplication table, kids stop seriously thinking after a few rows/columns. The second worksheet is more useful.

[Pen]

4 hours ago, Arcadia said:

 

Chemistry instills patience. Can’t rush through work or labs. Hard on a teen though so he has my sympathies.

Are his teachers aware of his dysgraphia? In general most teachers would be compassionate about uppercase/lowercase issues but he might get points reduced in exams. I’ll go with gentle reminders rather than pushing.

I think the worksheet in photo one is too much busywork though and that would lead to careless mistakes. It’s like filling up a multiplication table, kids stop seriously thinking after a few rows/columns. The second worksheet is more useful.

 

It IS a lot and the photoed Pages were only about half of the total— each page had backs and there was another page related to a recent lab! 

It does tend to cause careless rushing to get it done.  A tough, but really good science teacher left, leaving two, neither of whom is sympatico with Ds .  He says most of the kids dislike this science teacher.  (Don’t know if that’s true, but it may be).  Sigh.