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Rufina [12.5K]
3 years ago
9

Why might it be important in a real life situation, to know if a chemical or physical change occurred?

Chemistry
1 answer:
Roman55 [17]3 years ago
6 0
There are four signs<span> that a chemical reaction has occurred: a </span>change<span> in color, a </span>change<span> in temperature, formation of a gas or formation of a precipitate. A precipitate is a solid that forms when two liquid solutions are mixed. As matter </span>changes<span> in a chemical reaction, it can either absorb or release energy.</span>
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Which of the following is a true statement about science?
Papessa [141]
D. All of the answers are true
4 0
3 years ago
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Question 4 (1 point)<br> If you have exactly one million atoms how many moles do you have?
rjkz [21]

Answer:

                       1.66 × 10⁻¹⁸  Moles

Explanation:

                     As we know one mole of any substance contains 6.022 × 10²³ particles (atoms, ions, molecules or formula units). This number is also called as Avogadro's Number.

The relation between Moles, Number of Atoms and Avogadro's Number is given as,

             Number of Moles  =  Number of Atoms ÷ 6.022 × 10²³ Atoms/mol

Putting values,

              Number of Moles  =  1.0 × 10⁶ Atoms ÷ 6.022 × 10²³ Atoms/mol

              Number of Moles  =  1.66 × 10⁻¹⁸  Moles

7 0
4 years ago
“What types of friction occur between your bike tires and the ground when you ride over cement, through a puddle, and when you a
Kruka [31]
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4 0
3 years ago
Which type of reactions form salts?
s344n2d4d5 [400]

Neutralization reactions are the reactions type which form salts.

Explanation:

Salts are formed by ionic bonds when the oxidation states of anions and cations are equal and have opposite signs. So one should be highly electronegative in nature and another should be highly electropositive in nature. So the electropositive element will be ready to give electrons and the electronegative element will be ready to accept all the electrons given by the electropositive element. As a whole the compound will be neutrally charged by adding of equal number of positively charged and negatively charged ions.

The reduction or addition of electrons will be occurring in cations and the oxidation or removal of electrons will be occurring in anions.

So the salt formation is based on neutralization reactions.

8 0
3 years ago
A _ _ has a definite composition that will not vary
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Answer: Mixtures do not have the same composition, properties, and appearance throughout.

Explanation: It does not vary from sample to sample.

7 0
4 years ago
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