Red, Orange, Yellow, Green, Blue, Violet and Indigo
Answer:
25 mL
Explanation:
The reaction that takes place is:
- Ca(OH)₂ + 2HNO₃ → Ca(NO₃)₂ + 2H₂O
First we<u> calculate how many Ca(OH)₂ moles</u> were spent in the titration:
- 25.0 mL * 0.100 M = 2.5 mmol Ca(OH)₂
Then we <u>convert Ca(OH)₂ moles into HNO₃ moles</u>, using the <em>stoichiometric ratio</em>:
- 2.5 mmol Ca(OH)₂ *
= 5.0 mmol HNO₃
Finally we <u>calculate the volume of required nitric acid solution</u>, using the <em>concentration</em>:
- 5.0 mmol ÷ 0.200 mmol/mL = 25 mL
Answer: A) Hard middle
Explanation: He describes the hard middle as a marketing campaign in which one doesn't get much profit per sale of product (usually inexpensive) to a not so large target audience.
The chemical energy, which is a type of kinetic energy explains the type of energy present in the wheels of a moving bus.
Explanation:
Kinetic Energy is the energy possessed by an object by virtue of its motion.
Kinetic Energy is present in every moving object. A moving bus, train,flying airplane, walking , running etc are some examples of Kinetic Energy.
Kinetic Energy is classified into two parts Rotational Kinetic Energy and vibrational Kinetic energy.
Kinetic energy depends on two things , the mass and the velocity of the object.
In the above example , in a moving bus,the wheels of the bus are also moving. So with motion, Kinetic energy gets formed.
Answer:
H. an exothermic reaction that released thermal energy.
Explanation:
The student will most conclude that this is a chemical reaction in which thermal energy is released to the environment.
Such reactions accompanied by the release of thermal energy are exothermic reactions.
- In an exothermic change, heat is liberated to the surrounding.
- The surrounding becomes hotter at the end of the changes.
- For such reaction we say that enthalpy change is negative.
For endothermic reactions, heat is absorbed. At the end of the reaction, the system is cold.
