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2 years ago

2.Identify the product based on the given features.

Chemistry

1 answer:

Elan Coil [88]2 years ago

5 0

Answer:

Thermoplastics

Explanation:

A polymer is a substance which has a molecular structure built up from a large number of similar units bonded together called monomers, typical examples include many synthetic organic materials used as plastics and resins.

Thermoplastics are those plastics which can be moulded into another shape after heating and can be bent easily. They are man-made polymers and they have a linear arrangement of monomers. They are used to make products such as toys, combs and containers.

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g When 2.50 g of methane (CH4) burns in oxygen, 125 kJ of heat is produced. What is the enthalpy of combustion (in kJ) per mole

Anna [14]

Answer:

-800 kJ/mol

Explanation:

To solve the problem, we have to express the enthalpy of combustion (ΔHc) in kJ per mole (kJ/mol).

First, we have to calculate the moles of methane (CH₄) there are in 2.50 g of substance. For this, we divide the mass into the molecular weight Mw) of CH₄:

Mw(CH₄) = 12 g/mol C + (1 g/mol H x 4) = 16 g/mol

moles CH₄ = mass CH₄/Mw(CH₄)= 2.50 g/(16 g/mol) = 0.15625 mol CH₄

Now, we divide the heat released into the moles of CH₄ to obtain the enthalpy per mole of CH₄:

ΔHc = heat/mol CH₄ = 125 kJ/(0.15625 mol) = 800 kJ/mol

Therefore, the enthalpy of combustion of methane is -800 kJ/mol (the minus sign indicated that the heat is released).

3 0

2 years ago

Based on the values you obtained for δh∘rxn, which of the reactions would you expect to be thermodynamically favorable and which

QveST [7]

Following reactions are involved in present reaction
1) Ag+(aq) + Li(s) → Ag(s) + Li+(aq) − 384.4kJ
2) 2Fe(s) + 2Na+(aq) → Fe2+(aq) + 2Na(s) + 392.3kJ
3) 2K(s) + 2H2O(l) → 2KOH(aq) +H2(g) −393.1kJ

In above reaction, reaction 1 and 3 has negative value of δh∘f, while reaction 2 has posiyive value of δh∘f. As per the sign convention positive sign indicates that heat is given out during the reaction, while negative sign indicates heat is to be supplied for reaction to occur. In alternative words, product formed in reaction 2 is stable as compared to reactant. Hence, it is thermodynamically favorable.

7 0

2 years ago

Scientists tracking a flock of ducks found that, on average, the ducks flew 740 km south in 12 hours. What were the speed and ve

Verizon [17]

1) 17.1 m/s

2) 17.1 m/s south

Explanation:

The speed of an object is a scalar quantity indicating "how fast" is the object moving, regardless of its direction of motion.

Being a scalar quantity, it has only a magnitude, while it doesn't have a direction.

The speed of an object is given by the formula:

$v=\frac{d}{t}$

where:

d is the distance covered by the object, which is the total length of the path covered by the object

t is the time taken to cover the distance d

In this problem we have:

$d=740 km =740,000 m$ is the distance covered by the ducks

$t=12 h \cdot 60 \cdot 60 =43,200 s$ is the time taken

Substituting, we find:

$v=\frac{740,000}{43,200}=17.1 m/s$

The velocity of an object is a vector quantity indicating how fast the object is moving in a certain direction.

Being a vector, velocity has both a magnitude and a direction.

The magnitude of the velocity is given by:

$v=\frac{d}{t}$

where

d is the displacement, which is the shortest distance in a straight line between the initial position and the final position of motion

t is the time taken for the displacement d to occur

And the direction is equal to the direction of the displacement.

In this problem:

$d=740 km = 740,000 m$ south is the displacement

$t=12 h \cdot 60 \cdot 60 =43,200 s$ is the time taken

Substituting, we find:

$v=\frac{740,000}{43,200}=17.1 m/s$ south

5 0

2 years ago

The image shows a wheel that's wound up and released. The wheel moves up and down as shown. Identify the position of the wheel w

Lesechka [4]

Explanation:

Since the wheel moves up and down, the position that represents the potential energy is that which has the maximum height from the ground.

Potential energy is the energy at rest of a body.

It is given as:

Potential energy = m x g x h

m is the mass of the body

g is the acceleration due to gravity

h is the height of the body

We can see that mass and height are directly related to the potential energy a body exerts.

The higher the wheel from ground, the higher its potential energy.

learn more

Potential energy brainly.com/question/10770261

#learnwithBrainly

7 0

2 years ago

The enthalpy change for converting 10.0 g of ice at -25.0 °C to water at 90.0 °C is __________ kJ. The specific heats of ice, wa

Nina [5.8K]

AH1 = m * c1 * AT1 calculate this for ice (-25C to 0C) AH2 = AHfus(1 mole)=6.01 kJ = 6010 J AH3 = m *c3 * AT3 calculat this for water (0C to 100C) AH4 = AHvap(1mole)=40.67 kJ = 40670 J AH5= m * c5 * AT5 calculate this for steam (100C to 125C)
Sum ---- AH1+AH2+AH3+AH4+AH5
Data m=18g (1mole water)
c1=specific heat ice= 2.09 J/g K c3=specific heat water= 4.18 J/g K c5=specific heat steam= 1.84 J/g K
AT = (Tend - Tinitial) as this is a difference between temperatures it doesn't matter the units Celsius or Kelvin. Kelvin (K)=Celsius (C)+273.15
AT1 = 0C - (-25C)= 25C= 273.15K - 248.15K= 25K AT3= 100C - 0C = 100C= 100K AT5= 125C - 100C= 25C=25K

6 0

2 years ago