3 years ago

Which lists only metalloids?

Chemistry

1 answer:

zmey [24]3 years ago

4 0

Answer:

Your answer is <em>B</em>

Explanation:

Here's a table of all the metalloids, some metalloids are not recognized by some but are by others so be careful.

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A cup of coffee (140g) cools from 75°C down to comfortable room temperature 20°C. How much energy does it release to the surroun

Thepotemich [5.8K]

Given that the mass of coffee in the cup = 140 g

Final temperature = $20^{0}C$

Initial temperature = $75^{0}C$

Let us assume the specific heat of coffee is equal to that of water = 4.184 $\frac{J}{g^{0}C }$

Temperature change = T(final) - T(initial) = (20 - 75 ) $^{0}C$

=- 55 $^{0}C$

-Heat given out by coffee = heat absorbed by the surroundings

Heat released into the surroundings =-( $mC(T_{final}-T_{initial})$ )

= $-(140g)4.184\frac{J}{g^{0}C }( -55^{0}C)$

= 32,217 J

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4 years ago

Give another mixture of liquids that is separated on an industrial scale by fractional

iren [92.7K]

Answer:

dna or diabeties can be separated

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3 years ago

Do the elements in group 7 of the periodic table react with metals to form covalent compounds, ionic compounds, neither, or both

Vladimir [108]

Answer:Group 1 elements have 1 valence electron, meaning they have 1 extra electron that can easily be donated to an atom in search of 1 more electron. When they give away that extra electron to form an ionic compound, they become more stable.

For example, Group 7A (Group 17) elements have 7 valence electrons, meaning they need 1 extra electron to be stable. Group 1 and 7A elements make splendid ionic compounds.

Explanation:

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2 years ago

What is the oxidation number of s in na2s4o6?

Novosadov [1.4K]

Answer:

+2.5

Explanation:

So the oxidation number of S in Na2S4O6is +2.5.

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3 years ago

Read 2 more answers

How do you know if a compound is neutral?

belka [17]

When the overall charge is equal to zero

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4 years ago