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2 years ago

What is an allotrope?

Chemistry

1 answer:

Lilit [14]2 years ago

3 0

A I think but idrk I just guess sorry if you get it wrong cause of me just be careful I could be wrong

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Find the mass of one mole of FeSO4. Show your addition and multiplication

myrzilka [38]

Answer:

151g/mol

Explanation:

1 Fe =55 1 S =32 4 O =64

7 0

4 years ago

If there are 1,000 mg in 1 gram. Then how many mg are in 2.5 grams?

mihalych1998 [28]

Answer:

1 gram =1000mg

Explanation:

Then 2.5g=2.5*1000

2500mg

7 0

3 years ago

What is the correct formula for combining Mg2+ and Br1+

True [87]

Answer: The correct formula is $MgBr_2$

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Here magnesium is having an oxidation state of +2 called as $Mg^{2+}$ cation and bromine $Br^{-}$ is an anion with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $MgBr_2$ .

The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic bond.

6 0

3 years ago

what is the molar mass of nicotine (C10H14N2)? Question 6 options: 14.11 g/mol 28.02 g/mol C 120.1 g/mol 162.2 g/mol C

viva [34]

Answer:

162.2 g/mol

Explanation:

Molar mass is defined as the mass in 1 mole of the substance. It is calculated by adding the molar mass of the substituents each multiplied by the subscript they have in the formula.

Thus, To calculate molar mass of nicotine having formula, $C_{10}H_{14}N_2$

Molar mass of C = 12.0107 g/mol

Molar mass of H = 1.00784 g/mol

Molar mass of N = 14.0067 g/mol

Thus, molar mass of nicotine = $12.0107\times 10+1.00784\times 14+14.0067\times 2$ = 162.2 g/mol

6 0

4 years ago

Help please!!! My science homework is due in 2 days and I need help!

sertanlavr [38]

1) Because the crystals do not have much time to develop if the lava cools fast, they are quite tiny. If the lava cools gradually, the crystals will have ample time to form and become huge. The size of crystals in an igneous rock is a good predictor of the conditions under which the rock developed.

2) Intrusive igneous rocks cool slowly from magma in the crust. They have a lot of crystals. Extrusive igneous rocks cool fast from lava near the surface. They are covered with tiny crystals.

3) Usually they will contain metal elements that oxidise easily. For example, the Igneous rocks on them Moon (the Maria or 'oceans') are darker in colour due to a higher percentage of iron.

4) The hue of igneous rocks is proportional to their density. Darker colored rocks have a higher density because they contain more material and iron. Light colored rocks have a lesser density because they contain less material and iron.
5) Magma is hot, molten rock under the earth's surface; lava is when magma reaches the earth's surface (it is then called lava).
6) The mineral grains with a pegmatitic texture are unusually big. The biggest ones are often more than 3 cm long. In intrusive rocks, this texture can be seen. The fact that they were particularly big did not imply that they cooled slowly.
7) Igneous rocks are classified according to their origin, texture and mineral composition. A igneous rock formed from lava that erupted on to earths surface.

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ROR

5 0

2 years ago