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azamat
3 years ago
5

In a chemical reaction, the atoms or starting molecules, are different from the products or ending molecules. atoms are neither

created, nor destroyed – simply rearranged asare and new are which occurs due to the transfer of .
Chemistry
1 answer:
bekas [8.4K]3 years ago
8 0
Electrons.

Have a read on REDOX.
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2. A quantity of 1.922g of methanol (CH3OH) was burned in a constant-volume
Cerrena [4.2K]
Mass of methanol (CH3OH) = 1.922 g
Change in Temperature (t) = 4.20°C
Heat capacity of the bomb plus water = 10.4 KJ/oC
The heat absorbed by the bomb and water is equal to the product of the heat capacity and the temperature change.
Let’s assume that no heat is lost to the surroundings. First, let’s calculate the heat changes in the calorimeter. This is calculated using the formula shown below:
qcal = Ccalt
Where, qcal = heat of reaction
Ccal = heat capacity of calorimeter
t = change in temperature of the sample
Now, let’s calculate qcal:
qcal = (10.4 kJ/°C)(4.20°C)
= 43.68 kJ
Always qsys = qcal + qrxn = 0,
qrxn = -43.68 kJ
The heat change of the reaction is - 43.68 kJ which is the heat released by the combustion of 1.922 g of CH3OH. Therefore, the conversion factor is:
5 0
2 years ago
All the following are signs of a chemical reaction, except
hodyreva [135]
C. a change of state. It can be a physical or a chemical state of change.
8 0
3 years ago
Read 2 more answers
Drinking water may contain a low concentration of lead ion (Pb2 ) due to corrosion of old lead pipes. The EPA has determined tha
Lynna [10]

Answer:

3.861x10⁻⁹ mol Pb⁺²

Explanation:

We can <u>define ppm as mg of Pb²⁺ per liter of water</u>.

We<u> calculate the mass of lead ion in 100 mL of water</u>:

  • 100.0 mL ⇒ 100.0 / 1000 = 0.100 L
  • 0.100 L * 0.0080 ppm = 8x10⁻⁴ mg Pb⁺²

Now we <u>convert mass of lead to moles</u>, using its molar mass:

  • 8x10⁻⁴ mg ⇒ 8x10⁻⁴ / 1000 = 8x10⁻⁷ g
  • 8x10⁻⁷ g Pb²⁺ ÷ 207.2 g/mol = 3.861x10⁻⁹ mol Pb⁺²
4 0
3 years ago
An object is acted upon by a force of 22 newtons to the right and a force of 13 newtons to the left. What is the magnitude and d
umka2103 [35]
22 Newton’s to the right but I’m not to sure make sure to check other answers!
5 0
3 years ago
Which element shares the most characteristics with magnesium (Mg)?
hjlf
Probably sodium Na because it has a similar atomic mass and number
4 0
3 years ago
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