CH2OHCH2OH is a general example of a polyhydroxyl alcohol. A polyhydroxyl alchol is one in which there are two hydroxyl groups present in the substance. The –OH group attached to both the carbon atoms.
B.electrical energy
C.chemical energy
D.sound energy
Can you explain the answer for me ?
B. The amount of energy that is absorbed is the same as the amount of energy that is released.
C. The amount of energy that is absorbed is less than the amount of energy that is released.
9.3 %
30%
7.5%
Answer:
percent by mass = 79%
Explanation:
Data Given:
mass of solute (Na₂CO₃) = 75 g
mass of solvent ( water ) = 20 g
mass percent of solution = ?
Solution:
Formula used to find percent by mass
mass of solute / mass of solution x 100 . . . . . . (1)
first we have to find mass of solution
mass of solution = mass of solute + mass of Solvent . . . . (2)
put values in equation 2
mass of solution = 75 g + 20 g
mass of solution = 95 g
Now,
put values in equation 1
Percent by mass = mass of solute / mass of solution x 100
Percent by mass = 75 g / 95 g x 100
Percent by mass = 79 %
so,
The percent of the solution by mass = 79%
***Note:
The same work can be used for the other values too i.e. if you have 20 g of solute and 75 g solvent.
Answer:
The answer is 78.9%
Explanation:
The percentage weight in volume indicates the mass of solute per volume. We will use the% weight/volume formula to calculate what the exercise asks for, as follows:
%
(2) protons (4) positrons
cesium (Cs)
magnesium (Mg)
titanium (Ti)
Answer: Potassium is the element which is less reactive than rubidium and more reactive than Calcium.
Explanation: Reactivity of an metal is defined as the tendency to loose electrons easily. In a periodic table, the reactivity increases down the group as size of the metal increases. The reactivity decreases across a period as the size of the metal decreases.
Rubidium lies in group 1, which has elements in the series: H, Li, Na, K, Rb, Cs and Fr.
And Calcium lies in period 4 which has elements in the series: K, Ca, (1st transition series), Ga, Ge, As, Se, Br and Kr.
So, the element to have reactivity more than rubidium and less than Calcium must be Potassium (K).
Answer:
A is the correct answer on edge
Explanation:
A)potassium (K)
(2) pressure (4) chemical energy
Answer: The correct answer is Option (1).
Explanation:
Average kinetic energy is defined as the average of the kinetic energies that is associated to the particles of the sample which are in random motion.
Temperature is the measure of the average kinetic energy of the particles. Formula used for calculating the average kinetic energy is given by:
where,
K = kinetic energy
R = Gas constant
= Avogadro's constant
T = temperature
Kinetic energy is directly proportional to the temperature of the particle.
As the temperature increases, the kinetic energy of the particles also increases and vice-versa.
Hence, the correct answer is option 1.