Answer:
the teacher means that if she had done more research she wouldve had a better result
Explanation:
During a chemical reaction, mass and energy are both conserved.
Answer: D
Explanation
A chemical reaction occurs following law of conservation of mass and law of constant proportion.
So according to law of mass conservation, the sum of the reactants' mass should be same with the sum of the products' mass. So, the chemical reaction conserved the mass.
And according to thermodynamics, a chemical reaction will be balanced or will be in equilibrium when the Gibbs free energy change (ΔG) is zero.
The Gibbs free energy change is the difference of the energies between the reactants and product sides.
So according to this, the energy is also conserved during a balanced chemical reaction.
Thus the law of mass conservation and the zero Gibbs' free energy change confirms that both the mass and energy should be conserved for a balanced chemical reaction.
Answer:
resonance
Explanation:
Resonance is the phenomenon that explains the bonding in the certain molecules or the ions by combination of different contributing structures into the resonance hybrid.
Resonance structures are the set of two or more than two Lewis Structures which collectively describe bonding of the molecule by using fractional bonds and fractional charges.
Consider the case of benzene, in which there are three double bonds and three single bonds but the actual bond length of the C-C bond in benzene is in between single and double bond. This is because of resonance.
When gases are in STP, it doesn't matter what the compound or chemical the gas is: there are 22.4 liters in a mole. No matter what. (Note that this is for STP and STP only! If you get a question like this and it's not in STP, disregard this rule!)
Knowing this, in order to calculate volume all we have to do is multiply it by 22.4:
4.2 * 22.4 = 94.08
There are 94 liters in C2H6 gas at STP
-T.B.
Answer:
G is correct option:
# of Ba atoms = coefficient 4 × subscript 1= 4
Explanation:
Formula:
4Ba(OH)₂
G is correct option:
# of Ba atoms = coefficient 4 × subscript 1= 4
Because there are only 4 atoms of Ba in given formula.
Ba(OH)₂ contain one atom of Ba while in question there are 4 moles of Ba(OH)₂ present thus total 4×1 = 4 atoms of Ba present.
Other options are incorrect. Because,
F:
# of Ba atoms = coefficient 4 + subscript 1 = 5
This shows given formula contain 5 Ba atoms. So it is incorrect.
H:
# of Ba atoms = subscript 4 × coefficient 2 = 6
This shows that subscript is 4 which is incorrect because coefficient is 4 and subscript is 1.
j:
# of Ba atoms = subscript 1 + coefficient 1 = 2
This option shows that subscript is one which is correct but coefficient is incorrect. The coefficient of Ba is 4 and coefficient is always multiply with subscript not added. So this option is also incorrect.