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enot [183]
2 years ago
14

Which of the following results in a chemical change in matter?

Chemistry
1 answer:
LenKa [72]2 years ago
8 0
The correct answer is 

D burning wood

because it's changing the wood.

The other's are physical changes because it's still the same thing, it's just in a different form.

Glad I could help, and good luck!

AnonymousGiantsFan
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Alcohol metabolism takes place in the<br> O small intestine<br> stomach<br> O<br> heart<br> Oliver
Vanyuwa [196]
It takes place in the liver

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2 years ago
You can measure length with the greatest precision using a tape measure marked in _____.
Helen [10]
You can measure length wiht the greatest preciaion using a tape measure marked in milimeters.

Answer: C. milimeters.
5 0
3 years ago
Read 2 more answers
The air bags in automobiles were once inflated by nitrogen gas generated by the rapid decomposition of
Basile [38]

Answer:

1.57 mol NaN₃

Explanation:

  • 2 NaN₃ (s) → 2 Na (s) + 3 N₂ (g)

First we <u>use PV=nRT to calculate the number of N₂ moles that need to be produced</u>:

  • P = 1.07 atm
  • V = 53.4 L
  • n = ?
  • R = 0.082 atm·L·mol⁻¹·K⁻¹
  • T = 23.7 °C ⇒ 23.7 + 273.16 = 296.86 K

<u>Inputing the data</u>:

  • 1.07 atm * 53.4 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 296.86

And <u>solving for n</u>:

  • n = 2.35 mol N₂

Finally we <u>convert N₂ moles into NaN₃ moles</u>, using <em>the stoichiometric coefficients of the balanced reaction</em>:

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4 0
3 years ago
1) What is the mass in grams of a 51.2-mole sample of calcium?
trasher [3.6K]

Answer:

2051.9936 g

Explanation:

Mass = ?

Number of moles = 51.2 mol

The relationship between both quantities is given by the equation;

Number of moles = Mass / Molar mass

Solving for mass;

Mass = Number of moles * Molar mass

Mass = 51.2 * 40.078

Mass = 2051.9936 g

3 0
3 years ago
Use the equation
aivan3 [116]

The  number of grams  of copper  reacted is   445  grams


<u><em>calculation</em></u>

2Cu +O₂ → 2CuO

from equation above the  mole ratio  of Cu:CUO  is 2:2 =1:1, therefore the moles of Cu  is also= 7.00  moles


mass=moles   x molar mass

from periodic table  the  molar  mass of Cu= 63.5  g/mol


mass= 7.00  moles x 63.5 g/mol =445   grams

7 0
3 years ago
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