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4 years ago

What do measurements of the mass of the Milky Way indicate?

1 answer:

8 0

That the mass is far lesser and distributed mistakenly, as compared to what the orbits of stars declare it should be. Stars orbit more rapidly than the mass would predict, particularly out toward the galactic edge. This means that there is more mass than has been measured, and that it is spread out in a huge cloud around the galaxy. This is one of the reasons why scientists believe that dark matter exists.

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What is the density of an object with volume of 5.36 mL and mass of 58.3

choli [55]

Answer:

option d is correct

Explanation:

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3 years ago

Carbon dioxide and ____ are outputs of cellular respiration

vova2212 [387]

Answer:

oxygen

Explanation:

plants use oxygen

5 0

3 years ago

Choose all the materials that S-waves cannot travel through.

crimeas [40]

Answer:

water

Explanation:

liquid don't have any shear strength and so a shear wave cannot propagate through a liquid.

6 0

3 years ago

How many atoms of neon (Ne) are in a 1452.96 moles sample of neon?

Firlakuza [10]

Answer:

8749.73× 10²³ atoms of He

Explanation:

Given data:

Number of atoms of neon = ?

Number of moles of neon = 1452.96 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

1452.96 mol × 6.022 × 10²³ atoms of He/ 1 mol

8749.73× 10²³ atoms of He

7 0

4 years ago

Answer ASAP 25 points

kykrilka [37]

Answer: The correct answer is $NH_3$ is the base and $NH_4Cl$ is the salt.

Explanation:

Neutralization reaction is defined as the reaction in which an acid reacts with a base to produce salt and water as products.

According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and a base is defined as a substance which accepts protons.

For the given chemical reaction:

$NH_3+HCl\rightarrow NH_4Cl$

Here, $NH_3$ is a base because it is accepting proton and HCl is an acid because it is loosing proton.

$NH_4Cl$ is considered as a salt because it is formed by the combination of acid and base.

Hence, the correct answer is $NH_3$ is the base and $NH_4Cl$ is the salt.

8 0

3 years ago

Read 2 more answers