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Ivenika [448]
3 years ago
13

Helllpppp!!!!!! Please

Chemistry
1 answer:
pav-90 [236]3 years ago
3 0

Answer: (C) Statements (i) and (iii)

Explanation: According to byjus.com, group VII elements are known as Halogens.

Not only that, but bbc.co.uk says " Atoms of group 7 elements all have seven electrons in their outer shell. This means that the halogens all have similar chemical reactions ."

It may just be (b) though as these are chemical reactions.

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List four metric prefixes and list what they stand for ( what they mean )
balandron [24]
A kilogram is 1,000 times larger than one gram (so 1 kilogram = 1,000 grams).
A centimeter is 100 times smaller than one meter (so 1 meter = 100 centimeters).
A dekaliter is 10 times larger than one liter (so 1 dekaliter = 10 liters)
A meter gram liter is the base unit


so. kilo-, centi, deka-, and meter grams and liters
8 0
4 years ago
What properties of matter are intensive independent of their size
Paha777 [63]

Answer:

temperature, refractive index, density, and hardness of an object

Explanation:

it is a bulk property, meaning that it is a physical property of a system that does not depend on the system size or the amount of material in the system

8 0
3 years ago
What is the volume of 12.0 grams of oxygen gas at STP<br><br> Atomic mass:O = 15.99 grams/moles
strojnjashka [21]

Answer:

16.82 L.

Explanation:

  • We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm (P = 1.0 atm, STP conditions).

V is the volume of the gas in L (V = ??? L).

n is the no. of moles of the gas in mol (n = mass/molar mass = (12.0 g)/(15.99 g/mol) = 0.7505 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 0.0°C + 273 = 273.0 K, STP conditions).

<em>∴ V = nRT/P</em> = (0.7505 mol)(0.0821 L.atm/mol.K)(273.0 K)/(1.0 atm) = <em>16.82 L.</em>

6 0
4 years ago
both sides in the war used military observers in hydrogen-filled balloons to watch the enemy's movements
lesya692 [45]

Answer:

Yes.

Explanation:

Hydrogen-filled balloons were widely used by the militaries during World War I (1914–1918). The main purpose of these hydrogen-filled balloons to detect movements of enemy troops and to provide direction to the artillery fire. Balloons were the targets of opposing aircraft because they knew the purpose of these balloons so they hit it whenever seen by the enemies so we can say that both sides used hydrogen-filled balloons as military observer to watch the enemy's movements.

7 0
3 years ago
17.<br> What do you know about a chemical compound by looking at its chemical formula
Bas_tet [7]

Answer:

The number and the kinds of atoms in the compound

Explanation:

  • A chemical formula of a compound contains symbols o the atoms of the elements present in the compound as well as the number of atoms of each element in the form of subscripts.
  • Therefore it helps us to know the elements in a compound and the number of atoms in the compounds.
5 0
4 years ago
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