D. beginning numbering at the end farther from the first branch.
In naming alkanes, the longest continuous chain in the compound is first considered and this gives the name of the compound intended. The name of the substituent on the compound are also arranged in alphabetical order when naming the compound.
The carbon atoms are numbered in the parent chain or ring to indicate where branching or substitution takes place. The direction of numbering is chosen such that the lowest numbers possible is given to the branches or substituents. If we begin the numbering at the end farther from the first branch, we won't give the lowest numbers possible to the branches.
A scientist wants to speed up a chemical reaction. What are three things that he or she can do to increase the reaction rate? Decrease Temperature Remove a Catalyst Increase Temperature Decrease Concentration Increase Concentration Add a Catalyst
Chemical reaction takes place when reactants molecules collide with each other in the reacting atmosphere. Thus, rate of a chemical reaction depends on the collision of reactant molecules and further collision depends upon various factors.
Catalyst is a substance that can change the rate of the reaction, it doesn't consumed in the reaction doesn't change the products of the chemical reaction. A catalyst increases the rate of a chemical reaction.
Increase in temperature, increases the rate of a chemical reaction as temperature is directly proportional to the rate of a chemical reaction.
Concentration of reactants also play a vital role in the rate of a chemical reaction. As the concentration of reactant increases, more will be the collisions, which increases the rate of a chemical reaction.
Thus, three things which increases the reaction rate are Addition of Catalyst, Increase Concentration and Increase Temperature.
What must be satisfied for a hypothesis to be useful
The following are the desirable features of a hypothesis that makes them useful:
1. A hypothesis should be susceptible to observation, and it should not be normative.
2. A good hypothesis should exhibit a generality.
3. A hypothesis should be specific, that is, the concepts are defined in a careful manner.
4. A good hypothesis should not defy logic.
5. And ultimately, a good hypothesis needs to be testable.
A hearing aid is an electronic device that __________ sound waves.
In a Synthesis or Combination: In this type of reaction two or more substances (reactants) react to produce one product. Combination reactions are exothermic (heat is released).
A combination reaction is also known as synthesis reaction it is a reaction where two or more elements or compound (reactants) combine to form a single compound (Products) such reactions may be represented by the equations of the following form X+Y→XY the combination of two or more elements and they form one compound is known as combination reaction for example C + O2→ CO2 carbon completely burn in oxygen to give carbon dioxide combination reactions are completely exothermic because where the bond form between the reactants heat is released.
Not all synthesis reactions may be exothermic.
An exothermic reaction is a reaction in which heat is given to the environment. This occur if the reactants energy is higher than the barrier energy for the product, the excess is converted into kinetic energy of the product, it is observed as heat released and marked temperature increase.