CHEMISTRY MIDDLE SCHOOL

The semi-conductors on the periodic table are classified as

Answers

Answer 1
Answer: Most likely the transition metals

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What is a sentence for weathering

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These rocks were either roasted or exposed to severe weathering 
Due to the weathering of the rock, the childrens' playground started turning into soil.Due to the weathering of the rock, the childrens' playground started turning into soil.

What does the drop in barometric pressure from 1003 millibars to 926 millibars tell  you about a hurricane?

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The pressure has decrease meaning the hurricane is less powerful

The pressure has decrease meaning the hurricane is less powerful

The explosion of fuel in an automobile engine cylinder is an example of to energy.

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Answer:

chemical to heat energy

Explanation:

Whitch of following are the raw materials of photosynthesis

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what are the answers??? They would be water, sun, and soil but you have the answers.

Why are some examples of a chemical reaction not actually foolproof evidence that of a chemical reaction?13, 8th grade, and I'm doing my science lab report: The lab was a chemistry lab. We got a bunch of toxic chemicals and put pairs of them together, recorded the reactions, and wrote balanced equations for each of them and identified what kind of reaction they were. The whole name of the lab is "Evidence of Chemical Reactions", and one of the first analysis questions is "write a paragraph about the kinds of changes you would expect to see if a chemical reaction occurs." I answered this with things like bubble formation, change of color, change of state of matter, etc. Then the next question said "any one of these signs is not always a fool proof indication that a chemical reaction is occurring. give two examples to support this statement." 
what are two examples to support the statement that the commonly known examples of chemical reactions occurring are not always foolproof evidence that chemical reactions are occurring?

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So basically, the change in color effects the amount of cations in the solution making it a physical change rather than a chemical one, defying the law of conservation of mass! I hope this helped! (The only time the change in color affects the amount of cations is in the Alkaline Earth Metals)

source: college science teacher 

Bubble formation, change of color, and change of state are not foolproof evidence of a chemical reaction due to physical changes and variations in the reactions.

While bubble formation, change of color, and change of state of matter are commonly associated with chemical reactions, they are not always foolproof evidence. Two examples to support this statement are:

  1. Physical changes can mimic some of these signs. For example, the melting of ice is a change of state, but it is a physical change rather than a chemical reaction.
  2. Some chemical reactions may not produce the expected signs. For instance, some reactions may be slow or occur at very low concentrations, making it difficult to observe noticeable changes.

Therefore, it is important to consider multiple lines of evidence and conduct further analysis to confirm the occurrence of a chemical reaction.

Learn more about Evidence of a Chemical Reactions here:

brainly.com/question/33458331

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What are the properties of the reactants?​

Answers

Answer:

Reactants starts the chemical reaction and gives right to the product either by thermal decomposition or in the presence of a catalyst.

Explanation:

Reactants and products contain the same atoms, but they are rearranged during the reaction, so reactants and products are different substances.

Answer:

The properties of reactant are:

1. it contains the same atoms

2. it describes the pathway of the reaction.
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