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3 years ago

Does a nebula have mass

2 answers:

7 0

nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases. although denser than the space surrounding them, most nebulae are far less dense than any vacuum created on earth – a nebular cloud the size of the earth would have a total mass of only a few kilograms. (wikipedia)

hope this helps! ❤ from peachimin

vivado [14]3 years ago

3 0

Yes, Planetary nebula are small objects, having a radius typically of 1 light-year and containing a mass of gas of about 0.3 solar mass. To find the mass you need estimate the nebula's density, either on the basis of how much light it emits or (more likely) how much it extinguishes light from objects behind it. Then you multiply by the volume, which is easy to estimate assuming that the nebula is even slightly symmetric.

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Which statement is true concerning the elements in families 1 and 2?

jeka57 [31]

Answer:

The correct option is;

D. All the elements in families 1 and 2 can place all their shell electrons in the s sub-level

Explanation:

The elements in families 1 and 2 also called the group 1A and group 2A elements are known as the alkali and alkaline earth metals. The elements in the families 1 and 2 are also referred to as the s-block elements as they have their valence electrons which are 1 and 2 respectively, in the s-orbital or s sub-level

Due to their low ionization energy, and the ease with which they donate their valence electrons, elements of the families 1 and 2 are known to be very reactive, and are found in a combined state in nature.

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3 years ago

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pentagon [3]

Answer:

Explanation:

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3 years ago

Which statement best characterizes chemical reactions

amid [387]

Dangerous
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3 years ago

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jekas [21]

Answer:

Explanation:

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3 years ago

If element x forms the oxides xo and x2o3 the oxidation numbers of element x are

Deffense [45]

Answer:

b) +2 and +3.

Explanation:

Hello,

In this case, given the molecular formulas:

$XO$

And:

$X_2O_3$

We can relate the subscripts with the oxidation states by knowing that they are crossed when the compound is formed, for that reason, we notice that oxygen oxidation state should be -2 for both cases and the oxidation state of X in the first formula must be +2 since both X and O has one as their subscript as they were simplified:

$X^{+2}O^{-2}$

Moreover, for the second case the oxidation state of X should be +3 in order to obtain 3 as the subscript of oxygen:

$X_2^{+3}O_3^{-2}$

Thus, answer is b)+2 and +3

Best regards.

3 0

3 years ago