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3 years ago

How are speed and velocity related

1 answer:

3 0

Speed is the absolute value of velocity. Speed being a scalar (magnitude) and Velocity is a vector (magnitude and direction). Both speed and velocity have to deal with magnitude. An example would be that speed would be 15 miles/hour while velocity would be 15 miles/ hour towards the west.

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Which substance is the oxidizing agent in this reaction? fe2o3+3co→2fe+3co2 express your answer as a chemical formula?

erma4kov [3.2K]

Equation is as follow,

Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂

Oxidation:

3 CO → 3 CO₂

Oxidation state of C in CO is +2, and that in CO₂ is +4. So, carbon has lost 2 electrons per mole and 6 electrons per 3 moles hence,

3 CO → 3 CO₂ + 6 e⁻

Reduction:

Fe₂O₃ → 2 Fe

Oxidation state of Fe in Fe₂O₃ is +3 per atom, and that in Fe is 0. So, Iron has gained 3 electrons per atom and 6 electrons per 2 atoms hence,

Fe₂O₃ + 6e⁻ → 2 Fe

Result:
Iron in Fe₂O₃ has been reduced in this reaction and has played a role of oxidizing agent by oxidizing carbon from +2 state to +4 state.

4 0

3 years ago

g The first step in the process is to calibrate the grating, so we know the grating spacing (the distance between the openings i

Trava [24]

Answer:

The grating spacing is $d = 1055nm$

Explanation:

From the question we are told that

The wavelength is $\lambda = 590 nm = 590 *10^{-9}m$

The angle is $\theta = 34^0$

The order of the spectrum is $n = 1$

Generally in grating grating the condition for maxima to occur is

$d sin \theta = n \lambda$

where d is the grating spacing

making d the subject of the formula

$d = \frac{\lambda }{sin \theta }$

Substituting values

$d = \frac{590 * 10^{-9}}{sin (34)}$

$d = 1055nm$

8 0

3 years ago

What do you think would happen if you threw a block of polystyrene (styrofoam™) into the water?.

grandymaker [24]

Answer:

It will float

Explanation:

Polystyrene is not dense and its light and full of air. It will float.

5 0

3 years ago

Which gas law is represented by the following equation: V1/T1 = V2/T2

jasenka [17]

Answer:

Charles's law

Explanation:

The expression:

V1/T1 = V2/T2

represents Charles's law

The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the pressure is constant".

So,

V1/T1 = V2/T2

Pressure and the number of moles are constant

V and T are the volume and temperature

1 and 2 are the initial and final states.

5 0

3 years ago

Problem PageQuestion A student prepares a aqueous solution of butanoic acid . Calculate the fraction of butanoic acid that is in

Yanka [14]

Answer:

Incomplete question: A student prepares a 0.54 mM aqueous solution of butanoic acid...

The answer is: The percentage of dissociation is 15.4%

Explanation:

Given:

Ka = 1.51x10⁻⁵

Concentration = 0.54 mM = 0.54x10⁻³M

The reaction is:

C₄H₈O₂ = C₄H₇O₂⁻ + H⁺

I 0.54x10⁻³ 0 0

E 0.54x10⁻³(1-x) 0.54x10⁻³x 0.54x10⁻³x

Where x is the degree of dissociation

$Ka=\frac{[H^{+}][C_{4}H_{7}O_{2}^{-} }{[C_{4}H_{8}O_{2} } \\1.51x10^{-5} =\frac{0.54x10^{-3}x^{2} }{1-x} \\x^{2} +0.028x-0.028=0\\x_{1} =0.154\\x_{2} =-0.182$

We will choose the positive value

x = 0.154

The percentage of dissociation is 15.4%

3 0

3 years ago