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What else can I help you with?
Why is it impossible to have a reaction time equal to zero seconds?
In absolute terms, no. If the reaction hasn't had any time to occur there is no reaction time to report.OTOH, you could say yes if the reaction time is
What is the difference between a conscious reaction and a reflex reaction?
Reflex reaction: It is something your body does in response. For example if you see a truck coming towards you, you run . you personally have no control over the reaction . its something your body does wheter you think about it or not :) concsious control reactions: e.g. someone says hi to you you say hi back or someone goes for a hi 5 you go back : )
When a frog jumps off a leaf is that force a reaction force?
The action force is the frog pushing off of the log. The reaction force is the log pushing back on the frog. The result is the frog jumps. The force the frog exerts has to be greater than the reaction force of the log for movement to occur. Unbalanced forces equal movement. Balance foces = no movement.
What is an example of a dependant variable?
Let's say you wanted to find out how you mother would react if you got an F on a quiz. Your grade is the independent variable. Your mother's reaction is the dependent variable.
You are skiing down a hill at constant speed What do Newton's first two laws say about your motion?
Newton's laws say that: according to the law of gravity, you will stay unless you go off a ramp and continue to travel dwnhill. according to the law of inertia, you will NOT STOP unless somthing stops you. This something would be FRICTION. And the greater mass you have+the greater velocoty =greater force.
Which of the following is a statement of Hess's law?
All the reactions in a path are added together.
Is the enthalpy change of the chemical reaction between a monoprotic acid and sodium hydroxide the same for all strong monoprotic acids?
The reaction that occurs between a strong monoprotic acid and sodium hydroxide is H++OH- => H2O. This reaction is the same for all strong monoprotic acids and sodium hydroxide so, in theory, they should all have the same standard enthalpy of reaction. In practice, there are very slight differences between acids. If you are in a freshman or sophmore chemistry class, say yes. If you are in physical or analytical chemistry say no.
How do you draw enthalpy level diagrams?
its difficult to illustrate on this but basically the x axis is the progress of the reaction going from reactants to products the Y axis is the enthalpy, depending on whether it is an endothermic or expthermic reaction the chemicla reactants start at either high (for exothermic) or low (for endothermic). exothermic start high as you might say the reactants hold alot of energy hence why when the reaction takes place they release the energy. The fact that they release the energy means that when the reaction is finished the products will have lower enthalpy in an exothermic reaction as some energy is lost as heat along the waythe graph physically looks like this:http://www.avogadro.co.uk/h_and_s/bondenthalpy/hdiagrams.gif but you need an understanding of it to draw your own
What explains the entropy change of a gas reaction?
if there is an increase in the number of gas molecules , then ^S > 0
What does the law of constant proportions say about a reaction that has too much of one of the reactants?
The law of definite proportions says that a reaction that has too much of one of the reactants will eventually stop because it will run out of the other reactant(s). This is also referred to as the law of constant composition.
Why let say if the forward reaction is exothermic does this mean that the backward reaction gives out or take in heat and why?
If the forward reaction is exothermic then the back reaction would be endothermic. This happens because it upholds the law of conservation of energy, which says that energy cannot be created or destroyed.
How do forces of enthalpy determine change?
Firstly enthalpy is NOT a force; rather it is a state variable - a property of a reaction. To understand how forces affect enthalpy such that a change in state is observed - that is what you wanted to say. Secondly, ice formation is a good example of explaining enthalpy changes. As water - a relatively expanded form with a level of "heat" i.e. from interactions between water molecules - freezes to ice, that heat is given off into the environment; a measure of heat of the system has been lost to the environment and subsequently the enthalpy of the system has changed. With less heat - energy relating to molecular interactions - there are less molecular interactions and as a result the water molecules move closer together and thus ice forms. Indeed this is one way in which a change in enthalpy (NOT a force) affects a change in state. I do hope this was not so late so that I have wasted my time.
Does the sign of the enthalpy of fusion change depending on the direction of the phase change for example the enthalpy of fusion of water is 6025 JK per mol and going from liquid to ice is -6025?
The sign only depends on whether it's an exothermic or endothermic reaction. So no, it doesn't depend on phase change, and in some reactions, there is no phase change. But you will find correlation between the sign and the direction of the phase change because they will either be endothermic or exothermic. The enthalpy of fusion is positive because melting is an endothermic reaction (think - you put in heat to melt an ice cube). Endothermic reactions are represented by positive enthalpy. Conversely, freezing is an exothermic process (heat is taken out of the molecules in order to slow them down). We represent exothermic reactions with negative enthalpy.Always be conscious of the sign when working with thermochemistry calculations. Unlike the usual math, the signs of these numbers are somewhat arbitrary. We say that the system is losing heat in an exothermic reaction; thus, the energy must be represented by a negative. However, there are a few areas (like electrical engineering) where an exothermic reaction is represented by a positive number (because usually the goal is to produce heat).
Who say one may take it for granted that in every reaction there is an quantity of matter before after?
Antoine Lavoisier stated that in every chemical reaction, the total mass of the substances before the reaction is equal to the total mass of the substances after the reaction. This principle is known as the law of conservation of mass.
The only reactants in a reaction were Zn and HCI. What does the law of conservation of matter say about the products?
The law of conservation of matter states that matter cannot be created or destroyed in a chemical reaction. Therefore, the total mass of the products formed from the reaction between Zn and HCl must be equal to the total mass of the reactants.
What does a delta symbol mean in a reaction?
The delta symbol in a chemical equation stands for "change". Since you have to break and reform the bonds between atoms in molecules to have a chemical reaction there is going to be a change, whether it be in the thermal energy, chemical energy, phase of the matter etc.
How do you say nuclear reaction in German?
nuclear reaction= Kernreaktion
