Answer:
The answer to your question is below
Explanation:
7.- Sublimation is when a solid turns into a gas without becoming a liquid.
8.- Solidification or freezing is when the temperature of a liquid diminishes
and it turns into a solid.
9.- Melting is the process when a solid change into a liquid because of the
temperature increases.
10.- Condensation is the change in the state of matter from gas phase to a liquid phase.
11.- Evaporation is the process when a liquid turns into a gas.
Answer:
A. synthesis
Explanation:
The reaction given is a synthesis reaction in which two substances combines to give a product.
In this reaction:
4Fe + 3O₂ → 2Fe₂O₃
The reaction involves the formation of a single product from two or more reactants.
The formation of a compound from union of the constituent elements also falls into this category of reaction.
Answer:
argon and helium
Explanation:
Argon and Helium is belongs to noble gas. Since novel gases are completely filled outer orbital. therefore they are erratic nature. Hence, noble gas are very stable as it neither except electron nor it denote due to it paired of electronic configuration.
Depending on the materials being welded, these atmospheric gases react with welding area and either it reduces the quality of the weld or make the welding more difficult.
Therefore, to protect welding area from atmospheric gases noble gases which are small in size are used.
Thus, argon and helium are used.
Answer:
A force can speed up or slow down an object. A force can change the direction in which an object is moving. A bigger force on an object will produce a bigger change in the motion. A heavier object requires a larger force than a lighter object in order to undergo the same change in motion.
Explanation:
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