Answer:
The time recorded in the lab notebook is shorter than the true reaction time because the reaction starts the moment the two solutions were mixed
Explanation:
A chemical reaction is "a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction" (Oxford dictionary).
A chemical reaction begins immediately the reactants are mixed together in a reaction vessel because the particles of the reactants immediately begin to collide with each other. There is no lost time before reactions begins!
This implies that, the time recorded in the lab notebook is shorter than the true reaction time because the reaction starts the moment the two solutions were mixed.
A circuit is a closed loop that electrons can travel in. A source of electricity, such as a battery, provides electrical energy in the circuit. ... The appliance may, for example, provide light or heat or mechanical energy.
The food raises the temperature of the calorimeter by 1.29 °C. The amount of calorie produced by the combustion would be: 1.29°C * <span> 6.15 kJ/°C= 7.9335 kJ.
If the food weight is </span>0.521g, then the food value would be:
7.9335 kJ/ 0.521g / (4.184kcal/kJ) =
(15.227 kJ/g) / (4.184kcal/kJ)= 3.64 kilo calorie/gram
Deforestation, Desertification and Urbanization are very closely related phenomenon whose cause and effects are briefly discussed below.
<h3><u>Explanation:</u></h3>
Deforestation is caused due to cutting of trees for economic purposes and other poachers.
Deforestation effects the natural habitat of the animals of forests leading to endangering of different plants and animals. It also reduces diversity of environment, causes global warming, change in climate, rainfall patterns etc.
Desertification is caused due to deforestation, due to natural calamities like forest fires, overgrazing and even due to over population.
Desertification causes a huge loss to environment. Erosion of soil, deepening of ground water levels, loss of rainfall, draught are common. Rise in temperature and change of climates are also seen.
Urbanisation is caused by main two reasons - over population and rural to urban migration of people.
Urbanization has several good effects like growth of technologies etc. But it also increases disease rates due to increase in pollution. Several mental stress and depression are also seen to affect urban people more than rural ones.
Explanation:
Sodium is a metal
Chlorine is a non-metal
They both form ionic bonds in between them and exhibit their characters.
A metal is an electropositive material with a large atomic radius.
A non-metal is an electronegative material.
In forming an ionic bond, a metal will donate its electron. The non-metals gains this lost electrons.
The metals becomes positively charged and the non-metals carry a negative charge.
The electrostatic force of attraction between them causes the formation of an ionic bond in between them.
learn more:
Ionic bond brainly.com/question/6071838
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