Is it always possible to identify something as an element, compound, pure substance or mixture just by looking at it? Explain using examples from the tables. (table attached)
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Using, the table given above, one can conclude that, IT IS NOT ALWAYS POSSIBLE TO IDENTIFY A SUBSTANCE AS A COMPOUND, MIXTURE, PURE SUBSTANCE OR AN ELEMENT JUST BY LOOKING AT THEM.
Looking at the table, you will observe that, some of the substances listed under mixtures are actually compounds. That is, combination of hydrogen and oxygen will form water, which is a compound. Also, combination of sodium and chlorine will form sodium chloride, which is a compound.
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Students are able to introduce a sample of gas into a chamber with a moveable wall, allowing them to change the size of the portion of the chamber occupied by the gas. When the volume of the gas is reduced, what change in property would be the most reasonable to expect? a.)the temperature will decrease b.)the pressure will decrease c.) the pressure will increase d.) the density will decrease
Is ammonia a compound or an element?
Layers of rock containing fossils, like the layers illustrated here, are MOST LIKELY composed of ______________ rocks. A) igneous B) sedimentary C) metamorphic D) crystallized
How is the way water cools different from other liquids ?
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Answer:
A visible streak of light that shows the path of a rocky object which has entered Earth’s atmosphere is Meteor.
Explanation:
Meteors are the dust and ice originated from the trails of comets. They are the rocks present in the space, the visible bright streak is not from the rock, rather from the glowing hot air because of the hot rock zips from the atmosphere. When large number of the meteoroids strikes the Earth at one time is called meteor shower. It is the open- source isomorphic rocks. These are visible from the one point in the dark sky. These happens due to the masses of cosmic debris known as meteoroids which are coming inside the Earth's atmosphere at extremely great speed on parallel trajectories.
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Answer:
a
Explanation:
i took the quiz
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Answer:
S8 + 12O2 ---> 8SO3
Explanation:
S8 + 12O2 ---> 8SO3
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B. evaporate deposition
C. chemical precipitation
D. Biological precipitation
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The answer is: D. Biological precipitation.
Biological precipitation is the deposition of minerals from solution by the agency of organisms.
Deposition is the geological process in which sediments, soil and rocks are added to a landform or land mass.
Ocean sediments originate from numerous sources:
1) biological activity (biogenous).
2) weathering and erosion of the continents (terrigenous/lithogenous).
3) volcanic eruptions (volcanogenous).
4) chemical processes (hydrogenous).
Calcium carbonate (CaCO₃) is made of calcium, carbon and oxygen atoms.
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The mass ratio of potassium and selenium in the given compound is equal to 1 : 2.
What is the mass ratio?
The mass ratio also known as the percent composition by mass defines the proportion of a particular compound that consists of the constituent elements of that compound.
The percent composition by mass of a constituent element of a compound can be determined by the division of the mass of that element by the molar mass of the compound, followed by its multiplication by 100.
According to the law of constant proportion, a pure compound is always made up of the same elements combined together in a fixed proportion by weight.
Given the mass of the potassium (K) in the compound = 39 g
The mass of selenium (Se) in the compound = 78
The mass ratio of K and Se is 39 : 78
The simplest form of the ratio of potassium and selenium is 1 : 2.
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