Answer : The valley between the two peaks is usually referred to intermediate formation of the reaction. The two mountain peaks when formed in a reaction the stable phase between them is exactly when an intermediate is formed and often observed on the curve.
The valley between two peaks
Answer:
D. a pure substance and an element.
Explanation:
IM JUST HIM
Iron
Sugar
Sand
Explanation: An element does not exist alone in the nature. It exist in the form of isotopes of its own. Atomic mass of that element is the average atomic masses of the isotopes.
Average atomic mass of the element is defined as the sum of atomic masses of isotopes each multiplied with their respective natural fractional abundance.
Mathematically,
This is the reason, why an element does not have a whole number atomic mass, but exist in decimal numbers.
a gas that ignites a glowing splint is oxygen
The statement is true , oxygen is a gas which ignites a glowing splint.
A splint is a simple piece which is used in scientific laboratories. They are typically long, thin strips of wood of about 6 inches long and 1/4 inches wide. They are consumable and inexpensive. They are used for lighting burners , chemical identification of various gases .
For gases which are hard to distinguish , a glowing splint test is used for identification of gases. . These tests are useful for identifying whether the gas is oxidizing,flammable or chemically inert.Oxygen is one of the gases which can be identified using the splinter test as it is combustible.
For the test, the splint is lit and is allowed to burn for a fraction of seconds and then blown out as the tip is still hot it is introduced into the jar containing the oxygen gas and thus re-igniting the splinter.
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(2) 0.05 g (4) 5 g
Answer: The correct answer is (1).
Explanation:
Concentration of the solute in 1000 g of solution: 5 parts per million
1 part per million = 1 milligram/Liter
Then , 5 parts per million = 5 mg/liter
This means that 5 milligrams of solute is present in 1 liter solution.
1 gram = 1000 milligrams
Then 5 milligram = = 0.005 grams
Hence, 0.005 grams is the total mass of solute in 1000 grams of a solution having a concentration of 5 parts per million.
Parts per million (ppm) is how many parts a certain molecule or compound makes up within the one million parts of the whole solution.
Concentration of the solute in 1000 g of solution: 5 parts per million
1 part per million = 1 milligram/Liter
Then , 5 parts per million = 5 mg/liter
This means that 5 milligrams of solute is present in 1 liter solution.
1 gram = 1000 milligrams
Then 5 milligram = 5 X = 0.005 grams.
Hence, 0.005 grams is the total mass of solute in 1000 grams of a solution having a concentration of 5 parts per million.
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b. ecology d. food chain