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3 years ago

Please do number 13, I will give Brainliest

Chemistry

2 answers:

mihalych1998 [28]3 years ago

7 0

Okay, the milky way is a spiral-shaped galaxy that consists of a bar-shaped core region surrounded by a disk of gas, dust, and stars.
Hope that helped!

user100 [1]3 years ago

3 0

The galaxy we live in, called the Milky Way Galaxy, is a barred spiral galaxy composed of at least 100 billion stars. It is approximately 100,000 light years across and about 1000 light years thick.The spiral galaxies were characterized by disk shapes with spiral arms. It stood to reason that because the Milky Way was disk-shaped

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A homogeneous mixture is also called _______________. a solution. an element. a pure substance. a heterogeneous mixture. a compo

inessss [21]

A solution is right answer.

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4 years ago

Rank the ions in each set in order of increasing size, and explain your ranking:

Paha777 [63]

Explanation:

Lithium, sodium and potassium are all group 1A elements and when we move down a group then there occurs an increase in atomic size of the elements. As lithium is the smallest and potassium being the largest so, when each of them will lose an electron and obtain a positive charge then size of lithium will further decrease.

Therefore, ions are ranked according to their increase in size as follows.

$Li^{+} < Na^{+} < K^{+}$

When an atom tends to gain electrons then it acquires a negative charge. This means that size of the atom increases.

So, more is the negative charge present on an atom more will be its atomic size. Therefore, correct order of increasing size for $Se^{2-}, Rb^{+}, Br$ is as follows.

$Br < Rb^{+} < Se^{2-}$

Similarly, order of increasing size of $O^{2-}, F^{-}, N^{3-}$ is as follows.

$F^{-} < O^{2-} < N^{3-}$

5 0

3 years ago

Waves that require a medium through which to travel are electromagnetic waves. True or False?

aev [14]

Answer:

True

Explanation:

Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate.

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3 years ago

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Explain how you could use displacement reactions to distinguish between

hodyreva [135]

Answer:

A double displacement reaction is a type of reaction in which two reactants exchange ions to form two new compounds. Double displacement reactions typically result in the formation of a product that is a precipitate.

Explanation:

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3 years ago

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Which of the following has almost no mass?

elixir [45]

It’s is c. Electrons

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3 years ago