What pair of substances would most likely result in the production of a solid when reacting with a base
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Answer:
Both soluble metal salt and carbon dioxide may react with a base to form a solid or what we call a precipitate,
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Which statement describes this reaction?
( I) Bonds are broken, and the reaction is endothermic.
(2) Bonds are broken , and the reaction is exothermic.
(3) Bonds are formed, and the reaction is endothermic.
(4) Bonds are formed, and the reaction is exothermic.
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Answer: Option (1) is the correct answer.
Explanation:
In a molecule, the nitrogen atoms are bonded together by triple bond.
Therefore, in order to break this triple bond high heat or energy has to be provided.
Thus, the reaction shows that N triple bond N is broken down as energy is absorbed by
molecule.
Hence, we can conclude that in the given reaction bonds are broken, and the reaction is endothermic.
(2) Bonds are broken , and the reaction is exothermic.
(3) Bonds are formed, and the reaction is endothermic.
(4) Bonds are formed, and the reaction is exothermic.
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2. As the heat energy is absorbed by the water, thecurrents move and rise as the ocean waters from the equator heads to the northphase of the planet.
3. And then the waters from the polar areas headsto the south, while ascending and gushing it becomes heated by the sun.
The sun’s gravity also affects this body of water. Since it has a much more strongergravitation pull than of earth though its far away hence, high tide and low tide tendencies.
The heat moves in predictable ways, flowing from warmer objects to cooler ones, until both reach the same temperature. When air is in contact with the ocean at a different temperature than the sea surface, heat transfer by a conductor. The ocean absorbs and stores energy from the sun and when precipitation falls , it release heat energy in the atmosphere(air)
B. Composition of a substance is the same.
C. A completely new substance is formed.
D. An easily reversible process has taken place.
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the cell theory states that all new cells come from other living cells, and it's true for both multicellular as well as unicellular organisms.unicellular organisms reproduce through asexual reproduction,There are different types of reproduction like binary fission, vegetative, budding, fragmentation etc reproduction in unicellular organisms, through that they directly divide into new similar cells.
whiltin multicellular organisms, reproduction takes place through sexual reproduction, where male and female gametes are formed in separate reproductive organs and get transferred to form an embryo.
so in nut cell in unicellular organisms there is no specific organs,that is responsible for reproduction, while in multicellular there coplex reproductive system
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Explanation:
Given that,
The dimensions of the block of iron is 2 cm, 10 cm and 5 cm
To find,
The mass of the block.
Solution,
We know that, the density of iron is, d = 7.874 g/cm³
Density,
Where
m is mass and V is volume
Solving for m,
The block is in the form of a cuboid,
So,
Answer,
The mass of the block of iron is .
Reference,
Answer : 787.4 g
Explanation : With the given information; the volume of the block will be equal to = 5 cm X 10 cm X 2 cm = 100 .
Therefore, the volume will be100 .
but density of iron is found to be
So, now calculating for mass; on the basis of the density formula;
which is density = mass/volume; so, mass = density X volume;
Therefore, mass will be 7.874 g X 100 = 787.4 g
mass of the iron block = 787.4 g