Answer:
This question is incomplete, the remaining part of the question is:
What is the control group, independent variable and dependent variable?
Control group: Plants placed in 80 degree rooms
Independent variable: Change in temperature
Dependent variable: Change in color of leaves
Explanation:
The independent variable in a scientific experiment is the variable that the experimenter controls or manipulates in order to bring about a change in the dependent variable. In this experiment, the variable manipulated by Justin B is the TEMPERATURE CHANGE.
On the other hand, a variable is said to be dependent if it is the variable that responds to a change made to the independent variable or rather it is the outcome. In this experiment, Justin B is trying to see the outcome on the color change in leaves when exposed to a low temperature, hence, COLOR CHANGE IN LEAVES is the dependent variable.
Control group of an experiment is the group that receives no experimental treatment. It is the group the experimenter considers normal and hence is comparing with his experimental group. In this experiment, Justin B believes the leaves change color in a low temperature, hence, he placed some plants in a lower temperature (60 degree) in order to compare them with when the plants are placed in a higher temperature (80 degree). As far as this experiment is concerned, the plants placed in 80 degrees temperature are believed by Justin B not to undergo color change, hence, they are the CONTROL GROUP while the group he placed in 60 degrees temperature are what he is interested in, making them the EXPERIMENTAL GROUP
Percent yield is simply the ratio of the actual amount
produced over the theoretical amount that can be produced. In this case that
would be:
percent yield = actual amount / theoretical amount
percent yield = (14.5 g / 22.0 g) * 100%
<span>percent yield = 65.91%</span>
Answer:
The answer to your question is Molarity = 0.6158, I got the same answer as you.
Explanation:
Data
Molarity = ?
Mass of KMnO₄ = 36.5 g
Total volume = 375 ml
Process
1.- Calculate the Molar mass of KMnO₄
KMnO₄ = (1 x 39.10) + (54.94 x 1) + (16 x 4)
= 39.10 + 54.94 + 64
= 158.04 g
2.- Calculate the moles of KMnO₄
158.04 g of KMnO₄ ------------------- 1 mol
36.5 g of KMnO₄ --------------------- x
x = (36.5 x 1) / 158.04
x = 0.231 mol
3.- Convert the volume to liters
1000 ml -------------------- 1 L
375 ml --------------------- x
x = (375 x 1)/1000
x = 0.375 L
4.- Calculate the Molarity
Molarity = moles / volume
-Substitution
Molarity = 0.231 moles / 0.375 L
Result
Molarity = 0.6158
Answer:
1)The proximity of the positively charged phosphorous and negatively charged carbon stabilizes the charges.
2) Inductive effects and resonance stabilize the negative charge
Explanation:
both atoms have full octets of electrons( I.e Carbon and say phosphorus). The result can be viewed as a structure in which two adjacent atoms are connected by both a covalent and an ionic bond; normally written X+–Y−. Ylides are thus 1,2-dipolar compounds, and a subclass of zwitterions
Answer:
81°C.
Explanation:
To solve this problem, we can use the relation:
<em>Q = m.c.ΔT,</em>
where, Q is the amount of heat released from water (Q = - 1200 J).
m is the mass of the water (m = 20.0 g).
c is the specific heat capacity of water (c of water = 4.186 J/g.°C).
ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = final T - 95.0°C).
∵ Q = m.c.ΔT
∴ (- 1200 J) = (20.0 g)(4.186 J/g.°C)(final T - 95.0°C ).
(- 1200 J) = 83.72 final T - 7953.
∴ final T = (- 1200 J + 7953)/83.72 = 80.67°C ≅ 81.0°C.
<em>So, the right choice is: 81°C.</em>
