Which of the following is a double replacement reaction? Ca(OH)2 + H2SO4 → CaSO4 + 2H2O CH4 + 2O2 → CO2 + 2H2O 8Fe + S8 → 8FeS Z
2 answers:
Answer: Option (a) is the correct answer.
Explanation:
A chemical reaction in which there occurs exchange of two ions between two different compounds is known as a double replacement reaction.
For example,
Here, ions of
is replaced by
ions of sulfuric acid and
of sulfuric acid is replaced by
ions of
.
When two atoms combine together to form a compound then it is known as synthesis reaction.
When a compound reacts with oxygen to give carbondioxide and water then it is known as combustion reaction.
When a metal is treated with an acid to yield hydrogen gas then it is known as single replacement reaction.
Therefore, we can conclude that is a double replacement reaction.
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Answer:
A. She can run the same distance in a shorter amount of time.
Explanation:
Speed can be computed with the formula:
Where:
v = speed
d = distance
t = time
So if you look at the formula, distance there tells you how far an object has traveled, and the time tells us how long it took to cover that distance. As you can see, speed and time are <u>inversely proportional. </u>This means that as one goes up, the other goes down. So if we reduce time travelling a certain distance, the speed increases.