1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
bezimeni [28]
4 years ago
5

Why is burning wood considered a chemical change instead of a physical change? (Evidence pleaseee)

Chemistry
2 answers:
elena55 [62]4 years ago
7 0
Burning of wood is a chemical change as new substances which cannot be changed back (e.g. carbon dioxide) are formed. For example, if wood is burned in a fireplace, there is not wood anymore but ash. ... Physical changes are a change in which no new substances are formed, and the substance which is changed is the same.

Mademuasel [1]4 years ago
3 0

Burning wood is a chemical change and not a physical change because the carbon reacts with the oxygen, and that creates ash and smoke, you cannot undo ash and smoke, so therefore, it's only a chemical change


You might be interested in
How many moles of NaCl will be produced from 83 grams of Na
pochemuha
I believe the answer is 1.43
4 0
3 years ago
El superóxido de potasio, KO2, se emplea en máscaras de respiración para generar
Orlov [11]

Answer:

Reactivo límite: Superóxido de potasio.

Moles de oxígeno producidas: n_{O_2}=0.11molO_2

Explanation:

Hola,

En este caso, considerando la reacción química llevada a cabo:

4KO_2(s) + 2H_2O(l) \rightarrow 4KOH(s) + 3O_2(g)

Es posible identificar el reactivo límite calculando las moles de superóxido de potasio que serían consumidas por 0.10 mol de agua por medio de la relación molar 4 a 2 que hay entre ellos:

n_{KO_2}^{consumido\ por\ agua}=0.10molH_2O*\frac{4molKO_2}{2molH_2O} =0.2molKO_2

Así, dado que solo hay 0.15 mol the superóxido de potasio, podemos decir que este es el reactivo límite. Luego, calculamos las moles de oxígeno producidas, considerando la relación molar 4 a 3 que hay entre el superóxido y el oxígeno:

n_{O_2}=0.15molKO_2*\frac{3molO_2}{4molKO_2} \\\\n_{O_2}=0.11molO_2

Best regards.

4 0
3 years ago
Many computer chips are manufactured from silicon, which occurs in nature as SiO2. When SiO2 is heated to melting, it reacts wit
Feliz [49]

Answer:

Theoretical yield for Si = 2586.55*28.09= 72.7 Kg

Percentage yield is =2356.71/2586.55=91.11%

Explanation:

So the chemical equation for this reaction would be SiO2 + 2C = Si + CO

so n(SiO2)=m(SiO2)/M(SiO2)=155400/60.08=2586.55 mol

n(C)=m(C)/M(C)=77400/12.01=6444.63 mol

So Carbon is in exes.

n(Si)=m(Si)/M(Si)=66200/28.09= 2356.71 mol

Theoretical yield for Si = 2586.55*28.09= 72.7 Kg

Percentage yield is =2356.71/2586.55=91.11%

6 0
4 years ago
How to calculate moles​
Alex Ar [27]

Answer:

Moles = Mass / Mr

Moles = Concentration x Volume

Explanation:

Moles can be worked out in several ways depending on the information you are given. Some of the equations containing moles are:

Moles = Mass / Mr

Moles = Concentration x Volume

3 0
3 years ago
Which is a characteristic of nuclear fission?
FinnZ [79.3K]
A nucleus spontaneously splits and absorbs energy.
4 0
2 years ago
Other questions:
  • Which does heat represent ?
    14·1 answer
  • What is the measure if how much space an object takes up? A. Mass B. Density C. Weight D. Volume
    12·2 answers
  • When determining if a bond is polar, we must evaluate the difference in electronegativity (δen) of the atoms involved in the bon
    7·1 answer
  • H30 + = 1x10 -10m is this acid basic or neutral
    14·1 answer
  • How many moles are in 54.0 grams of Silver?
    7·1 answer
  • What is the correct interpretation of the mole ratios for the elements in
    10·1 answer
  • Please help! This is an exam practice but it’s really hard and I don’t really know it, any help will be appreciated!!
    10·1 answer
  • Which of the following is the composition of an isotope of calcium (atomic number 20)?
    8·2 answers
  • The reusable booster rockets of the space shuttle use a mixture of aluminum and ammonium perchlorate as fuel. A possible reactio
    9·1 answer
  • PLEASE HELP ME WHATS THE ANSWER
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!