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____ [38]
3 years ago
10

Which elements in the periodic table are metalloids or have semimetallic properties?

Chemistry
1 answer:
inessss [21]3 years ago
3 0
B, As only are metalloids or have semimetallic properties.
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A certain first order reaction has a half-life of 54. 3 s. How long will it take (in s) for the reactant concentration to decrea
Maksim231197 [3]

Answer:

82.4 s

Explanation:

Find the NUMBEr of half lives...then multiply by 54.3

2.27 = 6.5 (1/2)^n

log (2.27/6.5) / log (1/2) = n = 1.52 half lives

1.52 * 54.3 = 82.4 s

8 0
1 year ago
What happens when a chemical is determined to be dangerous?
Vlada [557]

Answer:

b

Explanation:

8 0
3 years ago
How are carbohydrates and lipids similar? how are they different?
Ludmilka [50]
"Lipids<span> are like </span>carbohydrates<span> in way that the true fats contain only carbon, hydrogen, and oxygen. Both </span>carbohydrates and lipids<span> act as the main fuels and energy storage compounds of the human body. They are also called SACCHARIDES and grouped as: Monosaccharides, Disaccharides, Trisaccharides, Polysaccharides."

Source credit: </span>https://www.quora.com/What-are-the-differences-and-similarities-between-carbohydrates-and-lipids
6 0
3 years ago
How many atoms are in 35.1 g of sodium chloride (NaCl) ?
hoa [83]

Answer:

I believe that there are 70.2

Explanation:

There are 2 atoms in sodium chloride so I x 35.1 by 2 and got 70.2

8 0
3 years ago
What two forces cause the arc-shape of projectile motion?
Talja [164]
Forces along the horizontal
force that caused initial velocity in x-dir
force that caused final velocity in x-dir


forces along the vertical
force that caused initial velocity in y-dir
force that caused final velocity in y-dir
force of gravity
4 0
3 years ago
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