What is the most common salt found in ocean water?
Answers
The answer i believe would be sodium.
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A beaker with water and the surrounding air are all at 24°C. After ice cubes are placed in the water, heat is transferred from:(1) the ice cubes to the air(2) the beaker to the air(3) the water to the ice cubes(4) the water to the beaker
HELP ASAPFor the reaction A(g) → 2B(g), Keq = 4.5 × 105. Which statement is true for the system at equilibrium? a) [A] >> [B] b)Changing the temperature will have no affect on the equilibrium. c)There is twice as much A as there is B in the reaction vessel. d)There is more than 100 times more B then there is A in the reaction vessel. e)There is twice as much B as there is A in the reaction vessel.
What is a single kind of organism that can reproduce among its own kind?
What is the atomic mass of ozone ????
(2) a decrease in activation energy and an increase in the reaction rate
(3) an increase in activation energy and a decrease in the reaction rate
(4) an increase in activation energy
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Answer: Option (2) is the correct answer.
Explanation:
Activation energy is the minimum amount of energy required to start or initiate a chemical reaction.
Whereas a catalyst helps in increasing the energy of reactant molecules so that they can overcome activation energy barrier and actively participate in the reaction.
Hence, adding a catalyst to a chemical reaction results in a decrease in activation energy and an increase in the reaction rate.
Adding a catalyst to a chemical reaction results in a decrease in activation energy and an increase in the reaction rate, as catalysts speed up chemical reactions by lowering the required activation energy. The correct answer to the given question is option (2) a decrease in activation energy and an increase in the reaction rate
In the world of Chemistry, a catalyst is a substance that increases the speed of a chemical reaction without itself undergoing any permanent chemical change. It achieves this acceleration by lowering the activation energy required for the reaction to occur. Therefore, adding a catalyst to a chemical reaction results in a decrease in activation energy and an increase in the reaction rate (option 2).
The activation energy is the minimum amount o f energy required for a chemical reaction to proceed. By lowering this energy barrier, a catalyst allows the reaction to proceed more quickly, in other words, it increases the rate of the reaction.
The correct answer to the given question is option (2) a decrease in activation energy and an increase in the reaction rate
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Answer: There are 2 oxygen atoms on the reactant side.
Explanation:
Every balanced chemical equation follows law of conservation of mass.
This law states that mass can neither be created nor be destroyed, but it can only be transformed from one form to another form.
This law also means that total number of individual atoms on the reactant side will always be equal to the total number of individual atoms on the product side.
The given balanced chemical equation follows:
On reactant side:
Number of hydrogen atoms = 4
Number of oxygen atoms = 2
On product side:
Number of hydrogen atoms = 4
Number of oxygen atoms = 2
Hence, the number of oxygen atoms on the reactant side is equal to 2.
The following balanced equation, 2H2O = 2H2 +O2, shows the decomposition of water (H2O). According to the equation, there are two oxygen atoms in the reactants and another two oxygen atoms in the product side.
B. Protect the iron from polluted air.
C. Add carbon to the iron.
D. Let the iron develop a natural coat of carbonate.
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(2) Energy is absorbed as a bond is broken.
(3) Energy is released as a bond is formed.
(4) Energy is released as a bond is broken.
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Answer:
The correct answer is option 3.
Explanation:
Whenever there is a formation of bond between 2 atoms energy is released. This energy release is due to stability gained by the atoms after the formation of a bond that is why extra energy is released as a heat into surroundings. Exact process is occurring when 2 bromine atoms form bond to give molecule of bromine.
Whenever there is a dissociation of bond between 2 atoms energy is given. The energy provided externally so as to break the stable bond present between the atoms.
forming of bonds releases energy, since the Br's are at a lower energy state as Br2
Answer is #3
FeCl3
Fe2(SO4)3
PbO
PbO2
Pb3O4
Answers
FeCl3= 162.2
Fe2(SO4)3= 354.88
PbO=223.2
PbO2 = 239.2
Pb3O4=685.6
Answers
The unknown mineral is likely "barite" due to its density of approximately 0.0251 g/cm³, which closely matches the calculated density of the unknown mineral.
To determine the unknown mineral, we can use the given information about its mass, volume of water displaced, and density. Here are the steps to find the unknown mineral:
1. Calculate the density of the unknown mineral using the formula: Density (g/cm³) = Mass (g) / Volume (cm³).
2. Use the density value to identify the mineral from the provided list.
Given:
- Mass of the unknown mineral = mass on the triple beam = 4.4 g
- Volume of water displaced = 0.175 L = 175 cm³ (since 1 L = 1000 cm³)
Now, calculate the density of the unknown mineral:
Density (g/cm³) = Mass (g) / Volume (cm³)
Density = 4.4 g / 175 cm³ = 0.0251 g/cm³
The density of the unknown mineral is approximately 0.0251 g/cm³. Now, let's find the mineral with a similar density from the provided list:
Among the given minerals, the closest density match is with "barite." Barite has a density of approximately 4.4 g/cm³, which is quite close to the calculated density of the unknown mineral.
Therefore, the unknown mineral is likely "barite."
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Answer:
Mass: 981.0 g
Density: 5.61 g/cm^3
Hardness: = 2.5 - 3
Unknown material: Chalcocite
I just got a 100 on the test ^ so that is right