Why is Fluorine, chlorine, bromine, and iodine grouped together?

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Answer 1

Answer: Fluorine, chlorine, bromine, and iodine grouped together because they have the same chemical and physical properties. They are also called halogens and under Group 7

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What are 3 signs that a chemical reaction is happening, what tells you that this is definitely a chemical reaction?

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Answer:

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change

Can someone solve 5 ?

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Please what are we solving for
Is it oxidation number or what?

Please help fast. I will give brainliest!!!

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Answer:

Reaction #4

Explanation:

Generally, combustion reactions produce water and carbon dioxide, and the fourth answer choice is the only one that produces both of these compounds. Therefore, the fourth answer choice is the only one that can be a combustion reaction.

Technician A says that a leaking head gasket can be tested for by using a chemical tester. Technician B says that a leaking head gasket can be found using an exhaust gas analyzer. Who is correct?

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Answer: Both technicians are correct

Explanation: A chemical tester and exhaust gas analyzer are two important ways to check for gasket leakage

Which formula represents copper(I) oxide?
(1) CuO (3) Cu2O
(2) CuO2 (4) Cu2O2

Answers

Answer : The correct formula of copper(I) oxide is, (3) $Cu_2O$

Explanation :

Copper(I) oxide is an ionic compound because copper element is a metal and oxide element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.

The nomenclature of ionic compounds is given by:

Positive ion is written first.
The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
In case of transition metals, the oxidation state are written in roman numerals in bracket in-front of positive ions.

The charge on copper is (+1) and the the charge on oxide is (-2). The charges are not balanced. The charges are balanced by the criss-cross method.

Hence, the formula of copper(I) oxide is, $Cu_2O$

The answer is (3) Cu2O. Copper (I) has an oxidation state of +1 (that's what the "I" indicates). You can also think of this as copper (I) having a charge of +1. Oxygen has an oxidation state of -2 (that's just a rule you have to know), and you can think of it as oxygen having a charge of -2. You need oxidation numbers in a neutral compound to add up to 0 (or charges in a neutral compond to add up to 0), so you need two Cu to balance the O, which is Cu2O.

Where does the equilibrium point occur in a reaction system

Answers

The equilibrium point for a reaction is the point at which the rate of the forward reaction equals that of the reverse reaction. At this point there will not be a net change in the amount of products or reactants observed.

I hope this helps. Let me know if anything is unclear.

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