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andrew-mc [135]
3 years ago
12

Hi can you please help me with this question .

Chemistry
1 answer:
antoniya [11.8K]3 years ago
3 0

Explanation:

a) X = 2,8,1 Y= 2,8,7

b) NaCl

c) X= 1 Y = 1

d) X shoot around water

and it less dense than water so it float s on water

2)Carbon moves from the atmosphere to plants. ...

Carbon moves from plants to animals. ...

Carbon moves from plants and animals to soils. ...

Carbon moves from living things to the atmosphere. ...

Carbon moves from fossil fuels to the atmosphere when fuels are burned. ...

Carbon moves from the atmosphere to the oceans.

3)PVC is used to make pipes, polyvinyl flooring and siding, hoses, cable coatings, medical devices, and plumbing and automotive parts. It is used to make material for upholstery, housewares, shower curtains, raincoats, toys, school supplies, food packaging, and shoes.

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Answer:

54

Barium atomic number is 56, this means that it has 56 protons in its nucleus and put it as a period 6 element. an uncharged barium atom would have 56 electron also. However as a group 2 element barium easily loses 2 electron to form the +2 cation. the ions has 56-2=54

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How many liters of oxygen gas, at standard temperature and pressure, will react with 35.4 grams of calcium metal? Show all of th
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Explanation:

1) Chemical equation:

2Ca + O₂ → 2CaO


2) Mole ratios: 2 mol Ca : 1 mol O₂ : 2 mol CaO

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n = mass in grams / molar mass = 35.4 g / 40.1 g/mol = 0.883 mol

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--------------------- = ------------------------------

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