Answer:As an ice cube melts, its shape changes as it acquires the ability to flow. However, its composition does not change. Melting is an example of a physical change .
Explanation:
Answer:
-Reversal of the resting potential due to influx of sodium ions
-Mechanism that restores the resting membrane voltage and intracellular ionic concentrations
-Period during which potassium ions are diffusing out of the neuron because of a change in membrane permeability
-A brief reversal of membrane potential that travels along the axon
Explanation:
An action potential is a situation where the membrane potential is briefly reversed from -70mV to +30 mV
There are three steps of the moving action potential, including;
1) The depolarization step, where the membrane resting potential is reversed by the rush of sodium ions into a neuron
2) The repolarization, due to the closing of the voltage-gated sodium channels and the opening of the potassium channels, which is a mechanism that restores the membrane's resting voltage and the ionic concentration in the cell
3) Hyperpolarization, where due to some open potassium channels, there is an increased potassium permeability, and excessive efflux of potassium ions take place, which results in a dip in the membrane potential
4) The above three phases describe the phase of the action potential which is the brief reversal of membrane potential that travels along the axon
Driving water out of crystals are crystallization process.
The piece of equipment used are evaporating dish.
Explanation:
Crystallization process
- Crystallization is a process of converting crystalline solid state into liquid state.
- It works both in purification and separation step.
- Steps involved in the crystallization process are
a) Nucleation
b) Crystal growth
- It is the oldest unit operation methods.
- Methods involved in this process are solvent evaporation, slow cooling, solvent diffusion and sublimation.
Evaporating dish
- Evaporating dish is a shallow open container.
- Evaporating dish is used to heat and evaporate solids.
- It is made by borosilicate glass or porcelain, which is non-reactive and withstand heat from Bunsen burner.
Answer:
176984.38J
Explanation:
E = mC∆T
Where E is the energy in joules
M is the mass of water
C is the specific heat capacity of water =4.184J/g°C
It is known that it will take 4.184J of energy to change the temperature of water by one degree Celsius.
∆T = 98.6°c - 5.4°c
= 93.2°c
∆H = 454.3g × 4.18J/g°C × 93.2°c
= 176984.3768
176984.38J
Answer:
Rayon
Explanation:
Rayon is a man-made fibre prepared from a natural raw material called cellulose by chemical treatment. The cellulose required for making rayon is obtained from wood pulp. Rayon is obtained by the chemical treatment of wood pulp. Wood pulp is dissolved in an alkaline solution to form sticky liquid called viscose.
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