The only statement on the options that says true about density is:
> The density of an object determines whether it will sink or float.
Why?
Density is a physical property of an object.
Density is not derived as a unit of measure. It is derived from 2 fundamental units: kg and m.
The Density of an object is not constant.
Density is calculated by dividing the mass by the volume of an object.
Atoms gain energy during evaporation and boiling
When a liquid begins to boil, it means its molecules and atoms are gaining increased kinetic energy and the molecules are getting further apart and the liquid is beginning to turn to gas.
Explanation:
Gas begins to form in the liquid and lift to the surface as bubbles and escaping into the atmosphere. The vapor pressure of the liquid also overcomes the atmospheric pressure in this stage allowing the change of phase. This can only occur as long as the molecules and atoms of the liquid continue to gain energy. This is the reason that even though you keep heating the liquid, it remains at its boiling point temperature as it changes phase. This energy is referred to as the latent heat of vaporization.
Learn More:
For more on latent energy of vaporization check out;
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Answer:
Relation between mutagens and carcinogens. Mutagenicity and carcinogenicity are clearly correlated. One study showed that 157 of 175 known carcinogens (approximately 90 percent) are also mutagens. The somatic mutation theory of cancer holds that these agents cause cancer by inducing the mutation of somatic cells.
The question is incomplete as the image and options are not given, however, the correct image and options are as follows:
A. If liquid Material A is in contact with gaseous Material A and the volume of the gas increases, the gas’s temperature will increase.
B. If liquid Material A is in contact with gaseous Material A and the volume of the gas increases, the gas’s temperature will decrease.
C. When the temperature of gaseous Material A increases, its volume will increase.
D. When the temperature of liquid Material A increases, its volume will increase.
Answer:
The correct answer is - C. When the temperature of gaseous Material A increases, its volume will increase.
Explanation:
The figure and table related to the given question are attached with the answer that shows the volume change during the time period in relation to temperature and the phase of material also changes with an increase in temperature.
According to Figure 1, it is clear that initially, Material A was in the liquid phase and after a certain temperature, it is constant at a phase of a mix of liquid-gas and finally entirely in the gas phase from Time 22 sec to Time 24 sec. as temperature increased and the volume of Material A also increased according to the table 1.
So the hypothesis C is correct.