All categories

3 years ago

Why is the formation of rust, iron oxide, considered a chemical change?

Chemistry

1 answer:

Kipish [7]3 years ago

7 0

It is irreversible involving the arrangement of the atoms.

You might be interested in

True or false: The force exerted onto an object must be perpendicular to the displacement if work is to be considered done.

RUDIKE [14]

Answer:

its letter B. false

Explanation:

bjchakfbhc

4 0

3 years ago

The rate constant of a reaction is measured at different temperatures. A plot of the natural log of the rate constant as a funct

Wittaler [7]

Answer:

The activation energy is 7.11 × 10⁴ J/mol.

Explanation:

Let's consider the Arrhenius equation.

$lnk=lnA-\frac{Ea}{R} .\frac{1}{T}$

where,

k is the rate constant

A is a collision factor

Ea is the activation energy

R is the ideal gas constant

T is the absolute temperature

The plot of ln k vs 1/T is a straight line with lnA as intercept and -Ea/R as slope. Then,

$\frac{-Ea}{R} =-8.55 \times 10^{3} K^{-1} \\Ea= 8.55 \times 10^{3} K^{-1} \times 8.314 \frac{J}{K.mol} =7.11 \times 10^{4} J/mol$

8 0

3 years ago

For many purposes we can treat ammonia (NH) as an ideal gas at temperatures above its boiling point of -33.C. Suppose the temper

levacccp [35]

Answer:

In homeothermic (“warm-blooded”) animals, body temperature is carefully

regulated. The hypothalamus, located in the brain, acts as the master ther-

mostat to keep body temperature constant to within a fraction of a degree

Celsius in a healthy animal. If the body temperature starts to deviate much

from the desired constant level, the hypothalamus causes changes in blood

flow and initiates other processes, such as shivering or perspiration, to bring

the temperature back to normal. What evolutionary advantage does a con-

stant body temperature give the homeotherms (e.g., birds and mammals)

over the poikilotherms (e.g., reptiles and insects), whose body temperatures

are not kept constant? What are the disadvantages?

Explanation: Basic chemical understanding as revealed upwards

6 0

3 years ago

A photon of visible light can be emitted when

Nataliya [291]

Answer:

a ground state electron jumps to a higher energy level

4 0

3 years ago

What type of tectonic activity occurs in the San Andreas Fault?

kykrilka [37]

The answer is a strike-slip. More specifically a right-lateral strike-slip.

6 0

3 years ago

Why is the formation of rust, iron oxide, considered a chemical change?​

Why is the formation of rust, iron oxide, considered a chemical change?