Assignment Instructions Step 1: Gather materials and necessary information. a) You will collect information about genetically modified foods, including: • A description of what genetically modified foods are • A list of crops that are typically genetically modified • An explanation of why crops are genetically modified • A description of how crops are genetically modified • A list of how genetically modified crops affect society and the environment b) Be sure to keep a list of your references so you can cite them properly later. c) Ask your teacher where you should save your presentation as you work on it. Your teacher

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

the solar system used to have much dust particles option no d

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).