The classification of living things makes it easier for scientists to answer many important questions.
Examples:
-How many known species are there?
-What are the defining characteristics of each species?
-What are the relationships between these species?
Answer: The total energy, in kilojoules, that is needed to turn a 46 g block of ice at -25 degrees C into water vapor at 100 degrees C is 11.787 kJ.
Explanation:
Given: Mass = 46 g
Initial temperature = 
Final temperature = 
Specific heat capacity of ice = 2.05 
Formula used to calculate the energy is as follows.
where,
q = heat energy
m = mass
C = specific heat capacity
= initial temperature
= final temperature
Substitute the values into above formula as follows.
Thus, we can conclude that the total energy, in kilojoules, that is needed to turn a 46 g block of ice at -25 degrees C into water vapor at 100 degrees C is 11.787 kJ.
Here we have to get the right answers which include the given phrase.
The correct answers are as following:
High boiling and melting points: Hydrogen bond increase the amount of energy required for phase changes to occur, thereby raising the boiling and melting points.
High specific heat: Hydrogen bond increase the amount of energy required for molecules to increase the speed, thereby raising the specific heat.
High surface tension: Hydrogen bonds produce strong inter molecular attractions, which increase surface tension.
The incorrect answer:
Lower density as a solid than as a liquid: actually, density of solid is more than density of liquid as hydrogen bonds in solid produce strong inter molecular attractions among molecules, which aggregates molecules together, hence volume of associated molecules reduces. Therefore, density of solid is more than that of liquid.
Answer:
<u></u>
- <u>Scientifically speaking, living things are alive because they have complex systems that allow them to be born, grow, reproduce and, when systems fail, die.</u>
Explanation:
The translation of the question is:
- why is a living being alive?
<h2>Solution</h2>
Answering from a scientific point of view, not a philoshophical one, a <em>living </em>organism is differentiated from a non-living entity in that the <em>living being</em> is born, grows, has the ability to reproduce and dies.
All that is possible because the living beings posses a complex network of systems that sustain their life.
Those systems include the homeosthasis, the metabolism, the answer to external stimulus, the ability of adaptation, the development (growing) and the reproduction.
To be considered a living being the organism must count wiht all those systems.
It is important that you know that viruses are not living organisms: they are chemical molecules which do not have metabolism and do not grow.
Answer:
B. Secondary pollutant
Explanation:
A primary pollutant is directly emitted into the atmosphere. Volcano eruptions and emissions from cars can result in primary pollutants in the air.
Secondary pollutants are not directly put in the atmosphere. They are created when two or more primary pollutants in the atmosphere react. One example is smog.
Another example is acid rain. If sulphur dioxide, nitrogen dioxide and water react, then acid rain is formed. Therefore, acid rain must be a secondary pollutant.
The best answer choice is B. secondary pollutant
