The atomic number is what?
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Which statement describes how an atom in the ground state becomes excited?(1) The atom absorbs energy, and one or more electrons move to a higher electron shell.(2) The atom absorbs energy, and one or more electrons move to a lower electron shell.(3) The atom releases energy, and one or more electrons move to a higher electron shell.(4) The atom releases energy, and one or more electrons move to a lower electron shell.
If the momentum of a car is reduced by half, assuming mass did not change, what must also have been reduced by half?
Doubling the number of particles of gas in an inflated tire will double the pressure of the gas in the tire.a. Trueb. False
Write the proper word equation to express the following chemical reaction: 4Fe (s) + 3Sn(NO3)4 (aq) Imported Asset 4Fe(NO3)3 (aq) + 3Sn
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The question is as follows: How many oxygen molecules are produced by the decomposition of 28.5 g of H2O2 (molecular mass = 34.0g / mol) according to the equation
2H2O2 (l) → 2H2O (l) + O2 (g)
Answer: There are molecules are produced by the decomposition of 28.5 g of
according to the equation
.
Explanation:
Given: Mass of = 28.5 g
As moles is the mass of a substance divided by its molar mass. Hence, moles of is calculated as follow.
According to the given equation, 2 moles of gives 1 mole of
. So, moles of
produced by 0.838 moles of
will be calculated as follows.
This means that moles of produced is 0.419 mol.
As per the mole concept, 1 mole of every substance has molecules.
So, molecules of present in 0.419 mole are as follows.
Thus, we can conclude that there are molecules are produced by the decomposition of 28.5 g of
according to the equation
.
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Answer:
Chemical properties,
Explanation:
Let us understand all the given terms
a) catalyst properties: this is the property of a substance by virtue of which it helps to modulate the rate of reaction, and itself remains unconsumed during the reaction (does not react). Example : enzymes
b) chemical properties: this is the property of a substance by virtue of which it reacts with another substance to give a new product of different structure, bonding, chemical and physical properties.
Example : hydrogen reacts with oxygen to give water.
So here the hydrogen is undergoing reaction with oxygen and this is chemical property of hydrogen.
c) Physical properties: This is the property which is related to the nature of a substance to exit in nature. for example hydrogen is a gas is its physical property not chemical.
d) mineral properties: It is again a kind of physical property.
Fe+Cl2-> FeCl2
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.100 mol Fe x ------------- = .05 mol Cl
1 mol Fe
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Answer: Blocks harmful UV rays transports and distributes heat cycles essential elements: C, O, and N
Explanation:
The atmosphere is the integral part of the earth this typically includes gases which are necessary for sustaining lives on earth. The earth atmosphere forms a protective blanket around the inner earth which prevents the entry of majority of UV rays directly coming from the sun, This way atmosphere plays an important role in protecting the living beings from carcinogenic UV rays. It distributes the heat coming from the sunlight also it reflect back the absorb heat energy to the space acquired from the sun so as to maintain the balance of heat on planet earth.
It essentially plays an important role in circulation of essential gaseous elements like carbon, oxygen and nitrogen as these are required by the plants to conduct photosynthesis, respiration and protein synthesis respectively. Majorly all other life forms on earth are dependent on plants for food requirements therefore this cycling is beneficial for sustaining their lives too.