Answer:
9
option d 9
pH of a 10^-5 M HCI solution is 9
Answer:
The correct answer is 16.8 g (option C)
Explanation:
Step 1: Data given
9.78 grams + 7.0 grams
Rule significant numbers say:
⇒ Non-zero digits are always significant.
⇒ Any zeros between two significant digits are significant.
⇒ A final zero or trailing zeros in the decimal portion ONLY are significant.
For addition and subtraction, look at the places to the decimal point. Add or subtract in the normal way, then round the answer to the LEAST number of places to the decimal point of any number in the problem.
9.78 g+ 7.0 g = 16.78 grams
Significant numbers = 1 decimal
16.78 ⇒ 16.8
The correct answer is 16.8 g (option C)
Answer:
B
Keep the temperature at 20°C. Stir the solution
Explanation:
One is b, through the logic that group one can only lose or gain one electron and group 18 which is the noble gases and 132 doesn't make sense.
number two is ionic because they are metals who usually form bonds with non metals, covalent bonds are nonmetals and nonmetal bonding.
for three if the charge is a positive then yes because the atom then becomes neutral. True.
B
B
A
