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3 years ago

10

Decide which element probably forms a compound with oxygen that has a chemical formula most and least similar to the chemical fo

rmula of the compound formed by oxygen and barium.

1 answer:

aleksley [76]3 years ago

6 0

Answer:

a. magnesium

b. nitrogen

Explanation:

Barium and magnesium are both in 2nd group, so most similar compounds.

Nitrogen - 15 group, so it forms least similar to barium compound.

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5. Identify each of the following as an element, a mixture, or a compound.

VashaNatasha [74]

Answer:

Aluminum foil ~ element

Air ~ mixture

Water ~ compound

Salt Water ~ mixture

Copper Wire ~ element

Steel ~ element

4 0

3 years ago

A sample weighing 3.110 g is a mixture of Fe 2 O 3 (molar mass = 159.69 g/mol) and Al 2 O 3 (molar mass = 101.96 g/mol). When he

grandymaker [24]

Answer:

The mass fraction of ferric oxide in the original sample : $\frac{723}{3110}$

Explanation:

Mass of the mixture = 3.110 g

Mass of $Fe_2O_3=x$

Mass of $Al_2O_3=y$

After heating the mixture it allowed to react with hydrogen gas in which all the ferric oxide reacted to form metallic iron and water vapors where as aluminum oxide did not react.

$Fe_2O_3(s)+3H_2(g)\rightarrow 2Fe(s)+3H_2O(g)$

Mass of mixture left after all the ferric oxide has reacted = 2.387 g

Mass of mixture left after all the ferric oxide has reacted = y

$x=3.110 g- y=3.110 g - 2.387 g = 0.723 g$

The mass fraction of ferric oxide in the original sample :

$\frac{0.723 g}{3.110 g}=\frac{723}{3110}$

5 0

3 years ago

How does a heat affect the chemical reaction?

patriot [66]

Answer:

Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.

Explanation:

6 0

3 years ago

Read 2 more answers

True or false? Second level consumers may be carnivore or omnivores

const2013 [10]

Yes this is true because they are able to consume 2 organisms which are plants and animal just like us.

3 0

3 years ago

Lava that cools quickly forms: A. basalt B. granite C.quartz D. none the above

lawyer [7]

The answer is A I’m pretty sure lol

3 0

2 years ago

Read 2 more answers