Which of the following are single-displacement reactions? A Mg (s) + 2H,0 (g) → Mg(OH)2 (aq) + Hz (g)

B. 2C, H6 (g) + 70, (g) → 6H,0 (9) + 4CO, (g)

c. AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaN3 (aq)

D. Clz (9) + KBr (aq) → KCI (aq) + Br2 ()

Multiple answer are allowed!!!

A & D

Explanation:

A single-displacement reaction is a chemical reaction whereby one element is substituted for another one in a compound and thereby generating a new element and also a new compound as products.

From the options, only options A & D fits this definition of single-displacement reactions.

For option D: Both left and hand and right hand sides each have one element and one compound. We can see that K is substituted from KBr to join Cl to form KCl and Br2 on the right hand side.

For option A: Both left and hand and right hand sides each have one element and one compound. We can see that OH is substituted from 2H2O to join Mg to form Mg(OH)2 and H2 on the right hand side.

The other options are not correct because they don't involve only and element and a compound on each side of the reaction.

! 55 !  

write a paragraph or story to explain the transformation between potential and kinetic energy as shown in your picture or model.  

you should have at least 5 complete sentences with a main idea and supporting details.  

you must include the following words:  

potential energy

kinetic energy

mechanical energy

conservation of energy

dude, this is hard lol : ))