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3 years ago

Which energy changes in the enthalpy of solution are endothermic, and which are exothermic?

1 answer:

8 0

When energy is needed in order for the reaction to happen, then that reaction is known as endotermic. When the reaction has as a result energy then it is exotermic. An example of an endotermic reaction would be photosynthesis, for an exotermic: combustion.

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state the stimulus and its response.is the response a voluntary action or an involuntary action?explain

mel-nik [20]

An action with a stimulus and reflex response is an involuntary action

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3 years ago

What data should be plotted to show that experimental concentration data fits a first-order reaction? A) 1/[reactant] vs. time B

natita [175]

Answer:

C) In[reactant] vs. time

Explanation:

For a first order reaction the integrated rate law equation is:

$A = A_{0}e^{-kt}$

where A(0) = initial concentration of the reactant

A = concentration after time 't'

k = rate constant

Taking ln on both sides gives:

$ln[A] = ln[A]_{0}-kt$

Therefore a plot of ln[A] vs t should give a straight line with a slope = -k

Hence, ln[reactant] vs time should be plotted for a first order reaction.

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4 years ago

3. How many atoms in 3.91 moles of sodium?

Gala2k [10]

Answer:

Explanation:

The formula for sodium is Na. It does not form a molecule in some way.

1 mol Na = 6.02*10^23 atoms

3.91 mol = x Cross multiply

x = 3.91 * 6.02 * 10^23

x = 23.65 * 10^23

x = 2.365 * 10^24

Scientific notation is always expressed as a number 1 ≤ x < 10

3 0

3 years ago

Most matter is made up of _____, rather than single _____.

bixtya [17]

Answer:

molecules, elements

Explanation:

molecules are a mix of elements

7 0

2 years ago

Enlist any four examples of chemical change ?

masha68 [24]

Answer:

heat

wather

climate

cold

6 0

3 years ago

Read 2 more answers