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3 years ago

Which chemical equation represents a decomposition reaction? HELP ASAP!!!!

Physics

1 answer:

Vanyuwa [196]3 years ago

7 0

Answer:

2H20 --> 2H2 + 02

Explanation:

ape x

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How much heat is required to convert 2.55g of water at 28 degrees c to steam?

pantera1 [17]

There are two different processes here:
1) we must add heat in order to bring the temperature of the water from $28^{\circ}C$ to $100^{\circ}C$ (the temperature at which the water evaporates)
2) other heat must be added to make the water evaporates

1) The heat needed for process 1) is
$Q_1=m C_s \Delta T$
where
$m=2.55 g$ is the water mass
$C_s = 4.18 g/J^{\circ}C$ is the water specific heat
$\Delta T=100^{\circ}C-28^{\circ}C=72^{\circ}C$ is the variation of temperature of the water
If we plug the numbers into the equation, we find
$Q_1 = (2.55 g)(4.18 J/g^{\circ}C)(72^{\circ}C)=767.4 J$

2) The heat needed for process 2) is
$Q=m L_e$
where
$m=2.55 g$ is the water mass
$L_e = 2264.7 J/g$ is the latent heat of evaporation of water
If we plug the numbers into the equation, we find
$Q_2=(2.55 g)(2264.7 J/g)=5775.0 J$

So, the total heat needed for the whole process is
$Q=Q_1+Q_2=767.4 J+5775.0 J=6542.4 J$

4 0

3 years ago

A balloon holds 20.0 L of helium at 10 degree Celsius. If the temperature doubles, and the pressure does not change, what will b

Natali [406]

To solve this we assume that the gas inside the balloon is an ideal gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant pressure and number of moles of the gas the ratio T/V is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

T1 / V1 = T2 / V2

V2 = T2 x V1 / T1

V2 = 2 x 20.0/ 1

8 0

4 years ago

In most cultures, the difference between the majority viewpoint and the minority viewpoint is that the majority group is made to

Maru [420]

If I've understood it correctly, the right one should look like this: In most cultures, the difference between the majority viewpoint and the minority viewpoint is that the majority group is made to feel normal and the minority group is made to feel divergent.

6 0

3 years ago

Read 2 more answers

A bicycle is traveling north at 5.0 m/s. the mass of the wheel, 2.0 kg, is uniformly distributed along the rim, which has a radi

vova2212 [387]

Answer:

H(angular momentum) = I * ω inertia * angular speed

ω = V / R = 5 m/s / .2 m = 25 / s

I = M R^2 = 2 kg * (.2 m)^2 = .08 kg-m^2

H = 25 / s * .08 kg-m^2 = 2 kg-m^2/s

Using the right hand rule - the angular momentum is towards the west - the same direction as the angular velocity

7 0

2 years ago

Why does the weight of water pulls the central part of the surface down?

Brut [27]

Answer:

Buoyancy or Upthrust

Explanation:

This is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object.

5 0

4 years ago