The isotope Z-22 has an abundance of 35% while Z-24 has an abundance of 65%. the average atomic mass of element Z is 23.3 amu.
Z- 22 ,percent abundance = 35 %
= 0.35
Z - 24 , percent abundance = 65 %
= 0.65
average atomic mass = (mass × percent abundance + mass × percent
abundance )
= (22 ×0.35 + 24 × 0.65)
= 7.7 + 15.6
= 23.3 amu
Thus, The isotope Z-22 has an abundance of 35% while Z-24 has an abundance of 65%. the average atomic mass of element Z is 23.3 amu.
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Most of earths volcanoes are formed by a the interaction of continental plates b the melting of ice on continental plates c meteorites that strike continental plates d water evaporating this is earth science
Most of Earth's volcanoes are formed by the interaction of continental plates.
What is earth sciences?
It is the study of the Earth's structure, properties, processes, and four and a half billion years of biotic evolution.
The movement of faults at plate boundaries can provide a convenient pathway for magma to reach surface. It helps to explain this by looking at three main types of plate boundary:
constructive boundaries (divergent): where plates are moving away from each other as new crust is created between two platesdestructive boundaries (convergent): where plates are moving towards each other and old crust is either dragged down into mantle at a subduction zone or pushed upwards to form mountain rangestransform boundaries (conservative): where plates are moving past each other and crust is neither created nor destroyedConstructive boundaries:
At constructive plate boundaries also known as divergent boundaries, the tectonic plates move away from one another to produce volcanoes. Hot magma rises from mantle at mid-ocean ridges, pushing the plates apartDestructive boundaries:
Volcanoes can form at subduction zones where the tectonic plates are moving towards each other and one plate descends beneath the other
Thus option a is correct answer
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A 0.9295 g Sample of Cobalt Chloride Hydrate is heated until it reaches a constant mass of 0.5976 g. Assume that only water is removed. Calculate the Percent of water.
The percent of water in the cobalt chloride hydrate would be 35.71%
Percent compositionThe percent composition of a component in a compound is the mass of that component relative to the mass of the entire compound. This can be mathematically expressed as:
Percent composition = mass of component/mass of compound x 100%
In order to find the percent water composition in the hydrated salt, the mass of water needs to be obtained.
Mass of the hydrated cobalt chloride sample = 0.9295 g
Mass of the cobalt chloride after removing water = 0.5976 g
Mass of water = mass of hydrated salt - mass of anhydrous salt
= 0.9295 - 0.5976
= 0.3319 g
Thus, percent water composition = 0.3319/0.9295 x 100%
= 35.71%
In other words, the percent of water in the cobalt chloride hydrate is 35.71%.
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Please Help!!
How are the transmission, prevention, and treatment of infectious diseases similar to and different from these processes in other diseases?
Answer:
Many types of medicine aim to treat a disease or injury rather than prevent it. However, preventive medicine stops the disease before it starts. Infectious diseases are transmitted from person to person by the transmission of pathogens such as bacteria, viruses, fungi or parasites. Non-communicable diseases are not transmitted by pathogens and are caused by several other indirect factors.
