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
irakobra [83]
2 years ago
11

Preparing a meal involves both physical and chemical changes. Which involves a chemical change?

Chemistry
2 answers:
nataly862011 [7]2 years ago
8 0
ANSWER: boiling water

Explanation: the others are physical changes
Airida [17]2 years ago
4 0
The water or the toast <3
You might be interested in
The metal that is used to hold stain glass pieces together is called __________.
inna [77]
The answer is D because most stained glass is held together with lead. The process of this is called leading.
4 0
3 years ago
Read 2 more answers
In methane combustion, the following reaction pair is important: At 1500 K, the equilibrium constant Kp has a value of 0.003691
andre [41]

Explanation:

Let us assume that the value of K_{r} = 2.82 \times 10^{5} \times e^({\frac{-9835}{T}}) m^{6}/mol^{2}s

Also at 1500 K, K_{r} = 2.82 \times 10^{5} \times e^({\frac{-9835}{1500}}) m^{6}/mol^{2}s

                     K_{r} = 400.613 m^{6}/mol^{2}s

Relation between K_{p} and K_{c} is as follows.

                  K_{p} = K_{c}RT

Putting the given values into the above formula as follows.

                  K_{p} = K_{c}RT

         0.003691 = K_{c} \times 8.314 \times 1500

                K_{c} = 2.9 \times 10^{-7}

Also,     K_{c} = \frac{K_{f}}{K_{r}}

or,                K_{f} = K_{c} \times K_{r}

                               = 2.9 \times 10^{-7} \times 400.613

                               = 1.1617 \times 10^{-4} m^{6}/mol^{2}s

Thus, we can conclude that the value of K_{f} is 1.1617 \times 10^{-4} m^{6}/mol^{2}s.

6 0
3 years ago
A bond created from the sharing of electrons between two atoms is a(an) ______ bond.
lora16 [44]
Covalent example ch4 where carbon is covalently bonded with all 4 hydrogens
5 0
3 years ago
1. A gas having the following composition is burnt under a boiler with 50% excess air.
jeka94

The composition of the stack gas are :

CH_4= 0.8713

C_3H_8 = 0.0202

CO = 0.107

<h3 /><h3>What is a mole fraction?</h3>

The ratio of the number of moles of one component of a solution or other mixture to the total number of moles representing all of the components.

Assuming 100 g of the stack gas. Calculate the mass of each species in this sample according to their percentages.

Mass of CH_4 : 70% of 100 g = 70 g

Mass of C_3H_8 : 15% of 100 g = 15 g

Mass of CO : 15% of 100 g = 15 g

Now calculate the number of moles of each species:

Number of moles of CH_4 : \frac{70 g}{16.04 g/mol} = 4.3 mole

Number of moles of C_3H_8: \frac{15 g}{144.1 g/mol} = 0.10 mole

Mass of CO : \frac{15 g}{28.01 g/mol} = 0.53 mole

Now to calculate the mole fraction of each we use the formula:

Mole fraction of CH_4: \frac{4.3}{4.935} = 0.8713

Mole fraction of C_3H_8 : \frac{0.10}{4.935} = 0.0202

Mole fraction of CO : \frac{0.53}{4.935} = 0.107

Hence, composition of the stack gas are:

CH_4 = 0.8713

C_3H_8 = 0.0202

CO = 0.107

Learn more about mole fraction here:

brainly.com/question/13135950

#SPJ1

8 0
2 years ago
Do all colors of light have the same energy?
icang [17]
No, darker colors like purple and blue have higher wave frequency which transmit more energy.
6 0
3 years ago
Other questions:
  • 3.) A 208 g sample of sodium-24 decays to 13.0 g of sodium-24 within 60.0 hours.
    7·1 answer
  • 1. A student tried to solve the following problem by selecting the tile as shown. What, if anything, did the student do wrong?
    14·1 answer
  • How many moles are in 1.2 x 103 grams of ammonia, NH3?
    7·1 answer
  • All rocks form deep beneath Earth's surface. True or False
    9·2 answers
  • A student thinks that halogens are highly reactive because their electrons are weakly attracted to their nuclei. Which is eviden
    13·2 answers
  • Identify the Lewis acid in this balanced equation:
    6·2 answers
  • Please can u help me answer both questions a and b thanks
    13·1 answer
  • Why would fluorine, chlorine, and bromine be placed in the same group (the halogens) in the periodic table of elements? (1 point
    9·1 answer
  • Chlorophyll molecules ______.
    8·1 answer
  • Write the number below in scientific notation rounded off to 3 significant figures.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!