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stich3 [128]
3 years ago
13

What are the examples of Alkaline Earth metals?

Chemistry
1 answer:
Elis [28]3 years ago
5 0
All of group 2: 
Be (Beryllium), Mg (Magnesium), Ca (Calcium), Sr (Strontium)
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This chart shows descriptions of the atoms for four different substances.
Whitepunk [10]
I think it’s Object 3
Hopefully this helps
8 0
2 years ago
Iron III sulfide is classified as what type
Oxana [17]

Answer:

ionic compound

Explanation:

that is the answer if you meant what type of compound.

5 0
2 years ago
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PLEASE HELP WITH CHEMISTRY !! BRAINLIEST AND 10 POINTS !!
NeTakaya

Answer:

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Explanation:

7 0
2 years ago
A reaction of 41.9 g of Na and 30.3 g of Br2 yields 36.4 g of NaBr . What is the percent yield?
Licemer1 [7]

Answer: The percent yield is, 93.4%

Explanation:

First we have to calculate the moles of Na.

\text{Moles of Na}=\frac{\text{Mass of Na}}{\text{Molar mass of Na}}=\frac{41.9g}{23g/mole}=1.82moles

Now we have to calculate the moles of Br_2

{\text{Moles of}Br_2} = \frac{\text{Mass of }Br_2 }{\text{Molar mass of} Br_2} =\frac{30.3g}{160g/mole}=0.189moles

{\text{Moles of } NaBr} = \frac{\text{Mass of } NaBr }{\text{Molar mass of } NaBr} =\frac{36.4g}{103g/mole}=0.353moles

The balanced chemical reaction is,

2Na(s)+Br_2(g)\rightarrow 2NaBr

As, 1 mole of bromine react with = 2 moles of Sodium

So, 0.189 moles of bromine react with = \frac{2}{1}\times 0.189=0.378 moles of Sodium

Thus bromine is the limiting reagent as it limits the formation of product and Na is the excess reagent.

As, 1 mole of bromine give = 2 moles of Sodium bromide

So, 0.189 moles of bromine give = \frac{2}{1}\times 0.189=0.378 moles of Sodium bromide

Now we have to calculate the percent yield of reaction

\%\text{ yield}=\frac{\text{Actual yield}}{\text{Theoretical yield}}\times 100=\frac{0.353 mol}{0.378}\times 100=93.4\%

Therefore, the percent yield is, 93.4%

3 0
3 years ago
Which organism in a food web would be best described as a recycler?
Anika [276]

C,

takes dead things, makes them into other things

7 0
2 years ago
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