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Ostrovityanka [42]
3 years ago
7

Which of the following is an nonmetal? A. He B. Re C. Cu D.Hg

Chemistry
1 answer:
tatyana61 [14]3 years ago
3 0
The answer is B.) Re, which stands for Rhenium.
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The total momentum of a group of objects remains________ unless outside forces act on the group.
damaskus [11]

Answer:

<em><u>constant</u></em>

Explanation:

In consideration of the conservation principle of linear momentum

8 0
3 years ago
Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron? A mole of iron has more atom
grandymaker [24]

Answer:

They both have the same number of atoms

Explanation:

The number that indicates the amount of particles in a compound is the Avogadro's number (NA).

It does not matter the mass of compound we have, If we have 1 mol we will be sure that we are talking about 6.02×10²³ particles

6.02×10²³ represents the amount of atoms in twelve grams of 12-pure carbon and it is considered a reference to measure the amount of all kinds of substances present in a given system.

8 0
3 years ago
What is the mass of a magnesium block that measures 2.00 cm
skad [1K]

Answer:

m = 31.284 grams

Explanation:

Given that,

The dimension of a magnesium block is 2.00 cm  x 3.00 cm x 3.00 cm.

The density of magnesium is, d = 1.738 g/cm³

We need to find the mass of the magnesium block. We know that the density of an object is given by its mass per unit its volume. So,

d=\dfrac{m}{V}\\\\\text{Where m=mass}\\\\m=d\times V\\\\m=1.738\ g/cm^3\times (2\times 3\times 3)\ cm^3\\\\m=31.284\ \text{grams}

So, the mass of the block is 31.284 grams.

5 0
3 years ago
Which greenhouse gas typically exists in both the stratosphere and the troposphere?
Arturiano [62]
The answer should be ozone
5 0
3 years ago
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What is the partial pressure of a gas mixture in a mixture of gases?
lesantik [10]
The answer is b. The sum of the individual gas pressure in the mixture
8 0
3 years ago
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