Vacuoles
➡️Plants have single large vacoule as compared to the animals which have many small vacuoles.✔️
➡️The main reason behind this fact are as follows:✔️
Storage:
➡️Plants form the base of the food chain.✔️
➡️They are capable of converting inorganic matter to organic matter.✔️
➡️To store these inorganic ions they are provided with the large vacuoles.✔️
➡️Moreover, plants can not move from one place to another.✔️
➡️So, it is very
easy for a plant to be able to store extra nutrients when they are around for use later when nutrients may not be available✔️
Growth:
➡️Plant cells grow by swelling.✔️
➡️They are provided with a rigid cell wall.✔️
➡️To make this wall expand, plant cells fill their vacuoles to exert pressure from inside.✔️
A) it is endothermic and heat is absorbed by the system.
2
A
l
+
F
e
2
O
3
→
A
l
2
O
3
+
2
F
e
Explanation:
One must first balance the metals before balancing non-metals such as Oxygen and Hydrogen (Hydrogen isn't involved in this case).
So therefore on the right hand side you see 2 Aluminium atoms and thus one must add a 2 before the Aluminium on the left hand side.
Secondly the Iron must be balanced, on the left it can be seen that there are 2 Iron atoms in
F
e
2
O
3
and thus a 2 must be added on the right hand side in order for them to balance.
Lastly the Oxygens must be balanced but in this case they already are at 3 on each side and thus the whole equation is now balanced.
Hope I helped :)
Answer:
145.78g/mol
Explanation:
Let the time taken for the two gas to effuse be x
For O2:
Volume = 6.51mL
Time = x
Rate (R1) = volume/time
R1 = 6.51/x
For the unknown gas:
Volume = 3.05mL
Time = x
Rate (R2) = Volume/time
R2 = 3.05/x
Now, we can obtain the molar mass of the unknown gas as follows:
R1 = 6.51/x
M1 (O2) = 16 x 2 = 32g/mol
R2 = 3.05/x
M2(unknown gas)
R1/R2 = √(M2/M1)
(6.51/x)/(3.05/x) = √(M2/32)
6.51/3.05 = √(M2/32)
Take the square of both side
(6.51/3.05)^2 = M2/32
Cross multiply to express in linear form:
M2 = (6.51/3.05)^2 x 32
M2 = 145.78
Therefore, the molar mass of the unknown gas is 145.78g/mol
Ans: 50m per sec
Explanation:
Speed= distance / time
therefore speed = 100m/2sec
=50m per sec