Answer:
Pb(NO₃)₂ + K₂CrO₄ ⟶ PbCrO₄ + 2KNO₃
Step-by-step explanation:
The unbalanced equation is
Pb(NO₃)₂ + K₂CrO₄ ⟶ PbCrO₄ + KNO₃
Notice that the complex groups like NO₃ and CrO₄ stay the same on each side of the equation.
One way to simplify the balancing is to replace them with a single letter.
(a) For example, let <em>X = NO₃</em> and <em>Y =CrO₄</em>. Then, the equation becomes
PbX₂ + K₂Y ⟶ PbY + KX
(b) You need 2X on the right, so put a 2 in front of KX.
PbX₂ + K₂Y ⟶ PbY + 2KX
(c) Everything is balanced. Now, replace X and Y with their original meanings. The balanced equation is
Pb(NO₃)₂ + K₂CrO₄ ⟶ PbCrO₄ + 2KNO₃
Answer:
Surface currents in the ocean are driven by global wind systems that are fueled by energy from the sun. Patterns of surface currents are determined by wind direction, Coriolis forces from the Earth's rotation, and the position of landforms that interact with the currents
Change in concentration = (concentration) = concentrationfinal – concentrationinitial
change in time = t = tfinal – tinitial
For instance, as the reaction A + B C progresses, the concentration of C increases. The rate is expressed as the change in the molar concentration of C, [C], during the time interval t. Concentration of C = [C ]
For a specific reaction we need to take into account the stoichiometry; that is, we need the balanced equation. For example, let's express the rate of the following reaction in terms of the concentrations of the individual reactants and products.
2NO(g) + O2(g) 2NO2(g)
These concentrations can be monitored experimentally as a function of time. Notice from the balanced equation, that 2 mol NO reacts with 1 mol O2; therefore, the concentration of NO will decrease twice as fast as that of O2.
Since the rates of change of individual reactants and products may differ the convention is to make the reaction rate come out to be the same no matter which reactant or product is used to calculate it. First we divide each concentration change by the coefficient from the balanced equation
Second, a negative sign is inserted before terms involving reactants. The change in NO concentration, [NO], is negative because the concentration of NO decreases with time. Inserting a negative sign in the expression makes the rate of reaction a positive quantity.
For a general equation:
aA + bB cC
the rate can be expressed in terms of any individual reactant or product.
No matter which reactant or product we use, the reaction rate will be positive and have the same value. 1. Write expressions for the rate of the following reaction in terms of each of the reactants and products.
2N2O5(g) 4NO2(g) + O2(g)
Rate of reaction =
2. In the reaction 2NO(g) O2(g) + N2(g)
If the rate of formation of O2 is 0.054 M/s, what is the rate of change of NO concentration?
Average Rate. The average rate of reaction over any time interval is equal to the change in the concentration of a reactant of a product [C] divided by the time interval, t, during which the change occurred.
[A], or
Instantaneous Rate: The slope of the tangent to the curve at any given time or instant when you plot or graph [reactant] vs. time.
Answer:
CCl4 is a covalent bonded nonpolar molecule.
Explanation:
Although there is an electronegativity (small) difference between C and Cl, its structure with 4 chlorine atoms allows the polarity to be "canceled out." I have attached a picture of the molecule below where you can clearly see the dipole movement on either side gets canceled hence making it have no net dipole movement. Additionally, CCl4 has a total number of valence electrons to be 32. 7 for one chlorine atom and 4 for a carbon one. The octets are satisfied as well. It's covalent because carbon and chlorine are nonmetals.