I think the correct answer among the choices presented above is option A. An ore is rock that contains a mineral or metal with economic usefulness. Examples are copper ore, gold ore and iron ore. These ores are being extracted from the Earth by mining.
Answer:
<h3>The answer is 0.32 moles</h3>
Explanation:
To find the number of moles given the number of entities we use the formula
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 1.93 × 10²³ particles
We have
We have the final answer as
<h3>0.32 moles</h3>
Hope this helps you
Answer:
THE TRUE STATEMENTS REGARDING REACTION RATE IS "INCREASING TEMPERATURE OR ADDING A CATALYST WILL INCREASE THE REACTION RATE".
Explanation:
The rate of a chemical reaction is the number of moles of reactant converted or product formed per unit time. There are various factors that affect reaction rate and they include;
1. Nature of the reactant
2. concentration and pressure of reactants. pressure is for gases.
3. temperature of the reactants.
4. surface areas of the reactants
5. presence of light
6. presence of catalyst.
I will talk about the role of temperature and catalyst in reaction rate.
TEMPERATURE:
The rate of virtually all reactions (chemical) increase when the temperature is increased. increasing the temperature of a system both exothermic and endothermic reactions, energy in the form of heat is supplied to the system which thus increases the number of particles with energies equal to or more than the activation energy of the system. This increase in particles leads to increase in collision and thus the reaction proceed faster.
CATALYST
A catalyst is a substance which alters the rate of a chemical reaction but remains unchanged at the end of the reaction. Catalyst operates by providing an alternative route for the reaction to occur. So adding a catalyst and has a lower activation energy when added increases the rate of reaction as more particles can collide with each other. This kind of catalyst is called positive catalyst. A catalyst that provides an alternative route with a higher activation energy is called negative catalyst.
Answer:
The answer is true.
Explanation:
Hello! Let's solve this!
The answer is true.
When a crust undergoes great tension, a crack opens and the oceanic crust begins to form. As the crack enlarges, the continent is splitting. Thus an oceanic crust forms. So the oceanic crust is younger than the earth's crust.
Answer:
Here's what I get
Explanation:
Assume you want to use 0.5 mL of a stock solution with a concentration of 0.2 mol·L⁻¹.
You want to prepare a 0.002 mol·L⁻¹ solution.
1. Moles of Fe(NO₃)₃
2. Volume of dilute solution
