True
Density = mass/volume
Suppose that a block has a mass of 20 g and a volume of 20 cm^3.
Density = 20 g/20 cm^3 = 1 g/cm^3
Now, you cut the block in half. The half-block has a mass of 10 g and a volume of 10 cm^3.
The density of the half-block is
Density = 10 g/10 cm^3 = 1 g/cm^3
The density <em>stays the same</em>, even though the size of the sample has changed.
<u>Answer:</u> The correct answer is Option A.
<u>Explanation:</u>
A catalyst is defined as the substance which increases the rate of the reaction without actually participating in the reaction.
This substance decreases the activation energy of the reactants, so as to proceed the reaction at a faster rate by increasing their effective collisions.
It does not affect the concentration of the reactants.
For the given reaction:
![2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)](https://tex.z-dn.net/?f=2SO_2%28g%29%2BO_2%28g%29%5Crightarrow%202SO_3%28g%29)
If we add NO, which is acting as a catalyst will increase the rate of the reaction to produce the products which is ![SO_3](https://tex.z-dn.net/?f=SO_3)
Hence, the correct answer is Option A.
Answer:
D) The presence of additional Br- ions already in the solution means equilibrium will be reached when much less CuBr has dissolved.
Explanation:
CuBr ⇄
+ ![Br^-](https://tex.z-dn.net/?f=Br%5E-)
Because there is Br- in CuBr, when put into solution, those Br- ions become part of the products side of the equation, shifting the equilibrium back towards the CuBr side, meaning less CuBr will dissolve.
Incomplete question. However, I assumed you are referring to this poster.
<u>Explanation:</u>
Interestingly, we notice that Harriet Tubman made use of figurative language in her words. She used the literary device of personification; in which a thing or condition is spoken as though it was human or living.
By this using such kind of expression that has been used by literate individuals, it makes it surprising that Tubman is referred to as an illiterate.
For example, she personified "<em>death</em>", and "<em>liberty</em>" as objects she could have, obviously those were beautiful words which we expect only an educative person to say.
Answer:
c. Energy from the liquid is exhausted into the atmosphere outside the freezer
Explanation:
Energy from the liquid is exhausted into the atmosphere outside the freezer.
a. is wrong. If the energy remained inside the freezer, the warm liquid would cool down and the inside of the freezer would warm up.
b. is wrong. The freezer removes energy from the liquid.