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3 years ago

Grinding quartz crystals down to produce sand is an example of a

1 answer:

4 0

D. physical change. It's kind of self explanatory because it's physically changing the quartz crystals into a sand. I hope this helps!

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Which has the greater number of particles, 1 mole br2 or 80g br2?

KengaRu [80]

They have the same amount of particles.

If you convert 80g to moles, you will find that 80g of diatomic bromine is 1 mole.

3 0

4 years ago

Can you please help me?

lorasvet [3.4K]

Answer:

60 moles of NaF

Explanation:

The balanced equation for the reaction is given below:

Al(NO3)3 + 3NaF —> 3NaNO3 + AlF3

From the balanced equation above,

3 moles of NaF reacted to produce 1 mole of AlF3.

Therefore, Xmol of NaF will react to produce 20 moles of AlF3 i.e

Xmol of NaF = 3 x 20

Xmol of NaF = 60 moles

Therefore, 60 moles of NaF are required to produce 20 moles of AlF3.

4 0

3 years ago

Which chemical equation represents a precipitation reaction?

Licemer1 [7]

Answer:- D. $Li_2CO_3(aq)+FeCl_2(aq)\rightarrow 2LiCl(aq)+FeCO_3(s)$

Explanations:- In chemical equations, (aq) stands for aqueous, (l) stands for liquid, (g) stands for gas and (s) stands for solid. In double replacement reactions, (aq) means soluble and (s) means insoluble that is precipitate.

Looking at all the equations, it is only the last equation that has a solid product and so this is the only precipitation reaction. A precipitate for Iron(II)carbonate is formed in it.

4 0

3 years ago

Read 2 more answers

A 21.496 grams sample of magnesium is burned in air to form magnesium oxide and magnesium nitride. When the products are treated

Bond [772]

25.898 g is the amount of magnesium nitride and magnesium oxide formed.

Step1 2Mg(s)+ O2(g)-----> 2 MgO(s)

3Mg(s)+N2(g)------> Mg3N2(s)

Mg3N2(s)+ 6 H2O(l)---> 3Mg(OH)2 + 2 NH3(g)

Step2 Moles of NH3 = (2.813/17)

Moles of Mg3N2= (1/2) Moles of NH3 = (2.813/2x17)= 2.813/34

Mass of Mg3N2 = (2.813/34) x100 =8.274g (Molar mass of Mg3N2=100)

Step3 Mass of Mg in Mg3N2 =(72/100) x8.274 =5.957g

Mass of Mg converted in MgO= 21.496-5.957=15.539

Moles of MgO= Moles of Mg = 15.539/24

Mass of MgO = 15.539x40/24 =25.898 g.

Magnesium is a cofactor for over 300 enzymatic systems that regulate various biochemical reactions in the body, including protein synthesis, muscle and nerve function, glycemic control, and blood pressure regulation [1-3].

Learn more about magnesium at

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8 0

1 year ago

When a drawing made with a black marker gets wet, the marker bleeds and more separates into several colors. What method of separ

Mnenie [13.5K]

This example is describing the Chromatography method.

8 0

3 years ago

Read 2 more answers