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Ksenya-84 [330]
3 years ago
8

What is changed when matter undergoes a physical change? Give an example to explain your answer.

Chemistry
1 answer:
Aleks04 [339]3 years ago
7 0
The appearance changes but the physical properties stay the same. Ice and water are physical differences of the same material. Water can be turned into ice and back into water just by changes of temperature. Salt can be dissolved in water but the solution is just salty water, and the water and salt can be separated easily by boiling off the water and condensing it leaving the solid salt.
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What would happen if the Earth was tilted more than its current tilt of 23.5°? <br><br> HELP ASAP!!
Oduvanchick [21]

Answer:

Wouldn't the Earth's atmosphere be moving too fast that it eventually breaks out?

Explanation:

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3 years ago
How many electrons in an atom with the atomic number of 45
Sergio039 [100]

Answer:

Number of Protons: 45

Number of Neutrons: 58

Number of Electrons: 45

Explanation:

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Question 1. Count Sergei Lvovich Levitsky invented which of the following? A) Collodion processB) Digital imaging C) Dry plates.
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6 0
3 years ago
What is the weight of a 98 kg person
vladimir2022 [97]
The weight of 98kg is 216.053 pounds.
7 0
3 years ago
Iodine, I2, is a solid at room temperature but sublimes (converts from a solid into a gas) when warmed. What is the temperature
Stels [109]
<h3>Answer:</h3>

382.63 K

<h3>Explanation:</h3>

We are given;

  • Volume of Iodine as 71.4 mL
  • Mass of Iodine as 0.276 g
  • Pressure of Iodine as 0.478 atm

We are required to calculate the temperature of Iodine

  • We are going to use the ideal gas equation;
  • According to the ideal gas equation; PV = nRT, where R is the ideal gas constant, 0.082057 L.atm/mol.K.
  • Rearranging the formula;

T = PV ÷ nR

But, n, the number of moles = Mass ÷ Molar mass

Molar mass of iodine = 253.8089 g/mol

Thus, n = 0.276 g ÷ 253.8089 g/mol

           = 0.001087 moles

Therefore;

T = (0.478 atm × 0.0714 L) ÷ (0.001087 moles × 0.082057)

  = 382.63 K

Thus, the temperature of Iodine in Kelvin is 382.63 K

3 0
3 years ago
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