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3 years ago

It

Chemistry

1 answer:

ivann1987 [24]3 years ago

5 0

Answer:

His mistake was that he also gave the plants in the music room some fertilizer

Explanation:

When carrying out a reliable experiment, the only variable should be the question being tested. The question here is whether playing music for plants helps them grow faster. Therefore, all the plants should be grown in exactly the same conditions apart from the presence or absence of music.

However, Jo also added fertilizer to the plants in the room where music was playing. Therefore, we don't know whether the fertilizer or the music caused the plants to grow faster.

Instead, Jo should have not given fertilizer to any of the plants, or given fertilizer to all the plants.

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Solid aluminum and gaseous oxygen read in a combination reaction to produce aluminum oxide. 4Al(s) + 3O_2(g) rightarrow 2Al_2O_3

Kryger [21]

Answer:

4.7 g. Option 5 is the right one.

Explanation:

4Al(s) + 3O₂ (g) ⇄ 2Al₂O₃ (s)

We convert the mass of reactants to moles, in order to determine the limiting.

2.5 g Al / 26.98 g/mol → 0.092 moles of Al

2.5 g O₂ / 32g/mol → 0.078 moles of O₂

Ratio is 4:3. 4 moles of Al react with 3 moles of O₂

Then, 0.092 moles of O₂ would react with (0.092 . 3)/ 4 = 0.069 moles O₂

We have 0.078 moles of O₂ and we need 0.069 moles, the oxygen is the limiting in excess. Therefore the Al is the limiting reactant.

Ratio is 4:2. 4 moles of Al, can produce 2 moles of Al₂O₃

Then, 0.092 moles of Al would produce (0.092 .2) / 4 = 0.046 moles

If we convert the moles to mass, we find the anwer:

0.046 mol . 101.96 g/mol = 4.69 g

5 0

3 years ago

Which is a cause of physical weathering but not of chemical weathering ??

Soloha48 [4]

Wind becuase you can feel it whhich is physical

8 0

3 years ago

Andrej [43]

1.B) the subscript
2.B)CO2 .
3.B) potential energy is converted into kinetic energy
4.A) A roller coaster at the top of a hill
6.C) in motion
7.D) weed whacker full of gas
8.B) potential energy only
9.A) baking soda

4 0

3 years ago

Read 2 more answers

In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is

Gnoma [55]

3.heat of reaction
hope that helped

3 0

3 years ago

In order to use a pipet, place a at the top of the pipet. Use this object to fill the pipet such that the of the liquid is even

padilas [110]

Answer:

bulb or pump, meniscus, outside

Explanation:

In order to use a pipet, place a BULB OR PUMP at the top of the pipet. Use this object to fill the pipet such that the MENISCUS of the liquid is even with the volume line. Release the liquid, touching the tip of the pipet to the side of the container if necessary to release the last drop OUTSIDE the pipet tip.

4 0

3 years ago