CHEMISTRY MIDDLE SCHOOL

Is this right?If not what did I do wrong ?

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Answer 1
Answer:

Hey there,

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Based on the reactivities of the elements involved, which reaction will form products that are more stable than the reactants?A.
2AlBr3 + 3Zn → 3ZnBr2 + 2Al
B.
CaBr2 + 2Na → 2NaBr + Ca
C.
MgBr2 + H2 → 2HBr + Mg
D.
BaBr2 + Ca → CaBr2 + Ba
E.
2LiBr + Ba → BaBr2 + 2Li

Answers

Answer : The correct option is, (B)

Explanation :

According to the reactivity series of the elements, a chemical reaction occurs when the most reactive element displace the least reactive element and form more stable products as compared to the reactants.

Option A reaction : 2AlBr_3+3Zn\rightarrow \text{No reaction}

In this, no reaction will occur because zinc is less reactive metal as compared to aluminium. So, zinc will not displace the aluminium.

Option B reaction : CaBr_2+2Na\rightarrow 2NaBr+Ca

In this, the reaction will occur because sodium is more reactive metal as compared to calcium. So, sodium will displace the calcium easily.

Option C reaction :MgBr_2+H_2\rightarrow \text{No reaction}

In this, no reaction will occur because hydrogen is less reactive metal as compared to magnesium. So, hydrogen will not displace the magnesium.

Option D reaction :BaBr_2+Ca\rightarrow \text{No reaction}

In this, no reaction will occur because calcium is less reactive metal as compared to barium. So, calcium will not displace the barium.

Option E reaction :2LiBr+Ba\rightarrow \text{No reaction}

In this, no reaction will occur because barium is less reactive metal as compared to lithium. So, barium will not displace the lithium.

Hence, the option B reaction will form products that are more stable than the reactants.

The reactivity series of the elements are shown below.

Answer:

got it correct

Explanation:

Coal is made of carbon. Coal burns at high temperature in the presence of oxygen. The result of this chemical reaction is

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c +o 2 = co 2 i think....hopefully its not wrong

Why is it important to use 0 in measurement

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Answer:

Example:

0.0001 = 1 x 10-4

you can you 0 for applying weight or volume

Answer:

Expressed in kilograms, the mass of 0.098kg should still have two important digits. 0 is essential because if you don't use the zero after the decimal point then you will be using the incorrect measurement.

Hope this helps.

- Que

Definition of mitochondria

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Mitochondria is a spherical or elongated organelle in the cytoplasm of nearly all eukaryotic cells, containing genetic material and many enzymes importantfor cell metabolism, including those responsible for the conversion of food to usable energy.
an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers

What is an atom??????????

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the basic unit of a chemical element.
The basic unit of a chemical element and a extremely small amount of a thing or quality.

Whats a material made of oxygen and silicon

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Magma/Lava is mainly composed of silica, with some traces of oxygen. :D
Lava is mostley silicon with a little oxygen.
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