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Vikentia [17]
2 years ago
15

HELP ME with THIS I am time i have a little bit of time and still have more questions !!! CHEMISTRY!!

Chemistry
1 answer:
rosijanka [135]2 years ago
3 0

Answer:

1. is B 2. is C or B

Explanation:

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What is the oxidation number of chromium in dichromate ion, cr2o72-?
castortr0y [4]
Oxidation number is charge of element in compound. Can be neutral, positive or negative.
Oxygen in dichromate has oxidation number -2, becauce there are seven oxygens, net oxidation number of oxygen is -14.
2·x(oxidation number of Cr) + 7· (-2) = -2   2x= +12
x= +6, oxidation number of one chromium is +6.
8 0
3 years ago
What is the molecular formula of a compound with an empirical formula P2O5 and a gram-molecular mass of 284 grams? And why?
Lana71 [14]
I really don’t know but

Phosphorus pentoxide is a white solid which does not have any distinct odour. The chemical formula of this compound is P4O10. However, it is named after its empirical formula, which is P2O5. The molar mass of phosphorus pentoxide corresponds to 283.9 g/mol.
5 0
2 years ago
Which change of phase is most likely occurring in the beaker
solniwko [45]

Answer:

Evaporation

Explanation:

Heat makes molecules move and eventually evaporate.

5 0
3 years ago
Which of the following molecules has a bent shape?
poizon [28]

A, because the shape of it forms and arc much like a H2O molecule.

4 0
2 years ago
To protect yourself from consuming too much _____, you should limit your consumption of swordfish, king mackerel, and shark. a.
Serggg [28]

Answer:

b. mercury

Explanation:

Fishes and some other sea foods are are known to concentrate mercury in their bodies. Consumption of these products gradually accumulate mercury in the body over time.

More specifically, fishes like swordfish, king mackerel and shark are known to concentrate higher amount of mercury than other species of fishes. Hence, limiting their consumption will protect humans from mercury poisoning.

The correct option is b.

5 0
3 years ago
Read 2 more answers
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