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Alex
3 years ago
15

Which of these is an example of a physical change? Question 9 options: paper burning wood decaying iron melting steel rusting

Chemistry
1 answer:
guajiro [1.7K]3 years ago
7 0
Paper burning is a form of a physical change known as combustion. The chemical bonds in between atoms holding them together are being changed with the heat, making it different on an atomic level.
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Construction of dam : scarcity of water for animals
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What is the balanced equation of Na2S+CuSO4=CuS+Na2SO4?​
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What you were given is the balanced chemical equation
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Which of the following shows a valid combustion reaction?
marta [7]

Answer:   C2H4 + 3O2 → 2CO2 + 2H2O

Explanation:

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C2H4 + 3O2 → 2CO2 + 2H2O  Looks Good

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Chemistry student needs of 55g acetone for an experiment. by consulting the crc handbook of chemistry and physics, the student d
sergeinik [125]

Answer:

             70.15 cm³

Solution:

Data Given;

                  Mass  =  55 g

                  Density  =  0.784 g.cm⁻³

Required:

                  Volume  =  ?

Formula Used:

                  Density  =  Mass ÷ Volume

Solving for Volume,

                  Volume  =  Mass ÷ Density

Putting values,

                  Volume  =  55 g ÷ 0.784 g.cm⁻³

                  Volume = 70.15 cm³

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3 years ago
What is the number of electron and neutron protons in atom 35?
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The mass number = protons + neutrons. Bromine has a mass number of 80<span> and 35 protons so </span>80<span>-35 = </span>45<span> neutrons. b) How many electrons does the neutral atom of bromine have? The neutral atom of bromine has 35 electrons because the number of electrons equals the number of protons.</span>
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3 years ago
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