CHEMISTRY MIDDLE SCHOOL

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 1
Answer:

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 2
Answer:

Answer:

got it correct

Explanation:

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Consider the situation. Scientists have developed an explanation of a phenomenon from several verified hypotheses. The explanation has been confirmed through numerous experimental tests.Which option best describes this explanation?

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I think its B or D.

Answers

Answer:

B. scientific theory

Explanation:

The scientific theory explains the phenomenon observed in the natural world. It is based upon the scientific method. To arrive at the scientific theory a hypothesis is formed, experiments are designed and conducted, resulted evaluated, analyzed and conclusions are reached. scientific theory are based upon experiments that are tested under controlled conditions.

scientific theory

hope this helps :)

Movement of molecules from an area of lower concentration to one of higher concentration with carrier molecules, using energy, is called ______________. A.
osmosis

B.
mitosis

C.
diffusion

D.
active transport

Answers

D. Active Transport is the answer

1) identify the physical state of the substances pictured.2 what would happen to the shape of each substance if the jars were broken? use the differences in the physical state of the substances to explain your answer.
3)would the volume of each substance change if each were moved into a larger container? explain...

4)why do you think bottles are made from amorphous solids such as plastic and glass? why aren't they made from crystalline solids?
5)what must the melting point of the mold be compared to the temperature at which glass get soft?why?
6)when the parison is placed in the second mold, it doesn't yet have the exact shape of a finished bottle . is the prison's viscosity low or high? explain
7)glass is something called a super cooled liquid. why do you think this is so?

Answers

Can't help because APPARENTLY there is a picture that goes along with the questions. Post it and I can help.

What does the atomic numbrr represent on the periodic table?​

Answers

Answer:

Explanation:

The atomic number tell us the number of protons and neutrons in the nucleus of an atom. in other words ,each element has a unique number that identifies how many protons are in one atom of that element example, all hydrogen atoms, and only hydrogen atoms, contain one proton and have an atomic number of 1.

In a chemical reaction, ... interact to form ... a. molecules, atoms
b. products, reactants
c. elements, atoms
d. reactants, products

Answers

The answer is letter D. Reactants, Products

Everybody kept debating about is water wet so what you think?

Answers

Answer:it is not wet

Explanation: while many people believe it is, it is only our imagination of how our body think water would feel like.

Water is wet that is why you have to dry off after going swimming or after you wash your hands you have to dry them because they are wet. I don't understand how people think water is dry because water is a liquid and wet.
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