Answer:
To make 100 mL of a solution 100mM of acetic acid you need to add 0,57 mL of glacial acetic acid and mix with 99,43 mL of H₂O
Explanation:
Molarity is a way to express concentration in a solution, in units of moles of solute per liter of solution.
To know how to do 100 mL of a solution 100mM of acetic acid it is necessary to know, first, the moles of this substance with the desired volume and concentration , thus:
0,100 L × = <em>0,0100 moles of acetic acid</em>
These moles are obtained from glacial acetic acid. Thus, it is necessary to convert these moles to grams with molar weight and then to mililiters with density:
<em>0,0100 moles × × = </em><em>0,57 mL of glacial acetic acid</em>
Thus, to make 100 mL of a solution 100mM of acetic acid you need to add 0,57 mL of glacial acetic acid and mix with 99,43 mL of H₂O <em>-The necessary to obtain 100 mL-</em>
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I hope it helps!
Answer: -
92.4 s
Explanation: -
The decomposition reaction of a → b has a rate constant k = 0.00132 s⁻¹
From the rate constant we see that the reaction is of zero order.
The rate equation for a zero order reaction is
A₀ - A = kt
where A₀ = initial concentration.
T = time passed since start of reaction,
A is the amount present after t time passed.
A₀ = 0.156 M
A = A₀ - 78.1% of A₀
= 0.156 - x 0.156
= 0.156 - 0.122
= 0.034 M
Plugging into the formula
A₀ - A = kt
0.156 - 0.034 = 0.00132 x t
t =
= 92.4 s
t =
Answer: I HAVE ATTACHED PROOF SO DONT REMOVE MY ANSWER, MODS.
1. NO
2. NO
Explanation:
Hormones and neurotransmitters are the different chemical messengers. Hormones are former produced by endocrine glands and neurotransmitters are produced by nervous system.
Hormones are secreted from endocrine system and are released into bloodstream, but hormones act on the distant target cells. Some hormones like cortisol and melatonin are produced in brain and released in blood and affect other parts of body.
On other hand, the neurotransmitters are released from presynaptic nerve terminal in brain. Neurotransmitters move across synaptic cleft and then move to next neuron. At this site, they bind to specific receptors, causing changes in electrical properties of the target cells, which further can cause different postsynaptic effects. Their have fast actions.
Example of hormones:
Follicle stimulating hormone is released by pituitary gland into bloodstream. FSH is essential to the pubertal development and function of the women’s ovaries and the men’s testes.
Example of neurotransmitters :
Monoamine neurotransmitter, serotonin helps in regulating the mood, sleep and appetite as well as cthe ognitive functions such as memory and attention.