Answer:
Explanation:
[tex]n=f(t)= \frac{a}{(1+be^{-.9t})}[/tex]
At t = 0
30 = [tex]\frac{a}{1 + b }[/tex]
30 + 30 b = a
[tex]\frac{dn}{dt} =f(t)= \frac{-.9abe^{-.9t}}{(1+be^{-.9t})^2}[/tex]
For t = o
[tex]\frac{dn}{dt} =f(t)= \frac{.9ab}{(1+b)^2}[/tex]
given
24 = [tex]\frac{.9ab}{(1+b)^2}[/tex]
24 = [tex]\frac{30\times.9b }{1+b}[/tex]
24 = 27b / 1 + b
24 + 24 b = 27 b
24 = 3 b
b = 8
a = 30 + 30 x 8 = 270
[tex]n=f(t)= \frac{a}{(1+be^{-.9t})}[/tex]
Put t = infinity
n = a = 270
So at infinite time yeast population will stabilise at number 270 .
If a box of 500 washers weighs 125.0g how many boxes would you have if you have 18.0kg of washers? How many washers would this be?
Answer:
144 boxes, 72,000 washers
Explanation:
I'm not sure if this is right but convert the 18kg to g and then divide it by the grams. You get 144 and then multiply it by 500 for the total number of washers
What is the independent variable in this experiment?
Answer:
D
Explanation:
because it was the variable that was changed in the experiment. distance was controlled and speed changed with time.
how much electrons are present in MnO4-
The first ionization energy of fluorine and iodine
Answer:
The most electronegative atom, fluorine, is assigned a value of 4.0, and values range down to cesium and francium which are the least electronegative at 0.7. First Ionization Energy of Iodine First Ionization Energy of Iodine is 10.4513 eV.
Explanation:
How does bacteria from a fecal transplant help the patient with an C. difficile infection?
Answer:
difficile infection. By reintroducing a healthy diversity of bacteria, fecal transplantation can re-establish colonization resistance to prevent C. difficile from gaining a foothold and becoming a dominant organism in the environment of the gut.
Explanation:
A procedure calls for 0.250 kg of sugar. Your balance is in ounces. What mass in ounces should be weighed out on this balance?
Answer:
8.81849
Explanation:
i believe the whole number would be this but usually i round to the second decimal point, i dont know if you could do that in chemistry tho
PLEASE SOMEONE HELPP
Answer:
D
Explanation:
What is often added to the water used when reacting the group 1 metals with
water?
Universal indicator
An acid
An alkali
Oil
What is produced when sodium reacts with water?
Sodium oxide and water
Answer:
an acid.
sodium oxide and water
why is diamond hard
The outermost shell of each carbon atom has four electrons. In diamond, these electrons are shared with four other carbon atoms to form very strong chemical bonds resulting in an extremely rigid tetrahedral crystal. It is this simple, tightly-bonded arrangement that makes diamond one of the hardest substances on Earth.
Answer: Diamond is hard due to its giant covalent lattice and it has many strong covalent bonds.
Explanation:
Which is a homogenous mixture?
1. ceasar salad
2. pre-cooked pizza
3. coffee in a cup
4. different color beads in a bowl
Answer:
ceasar said is a homogeneous mixture
Answer:
ceasar salad
how would you differentiate between acid and bases if the list of their chemical formula is given to you
If a cube has an edge length of 0.843 cm what is the volume of the cube? (Answer should be 3 decimal places)
Answer:
0.600
Explanation:
Hope this helps!
A sample of gas has a volume of 526 mL at 346 mmHg and 35.0°C. Determine the moles of gas.
Answer:
The moles of gas is 0.009474 moles.
Explanation:
Given that,
Volume = 526 mL
Pressure = 346 mmHg
Temperature = 35.0°C
We need to calculate the moles of gas
Using formula of ideal gas
[tex]n=\dfrac{PV}{RT}[/tex]
Where, P = pressure
V = volume
R = gas constant
T = temperature
Put the value into the formula
[tex]n=\dfrac{\dfrac{346}{760}\times0.526}{0.08206\times(35+273)}[/tex]
[tex]n=0.009474\ moles[/tex]
Hence, The moles of gas is 0.009474 moles.
On July 8th, I will be 8.51472x108 seconds old. How old will I be in years? (Assume 365 days in a year.)
step by step
Answer:
You will be 27 years old (✿◠‿◠)
How to do ionic equations
Answer:
Write the ionic equation by breaking all the soluble ionic compounds into their respective ions. Each ion should be shown with its charge and an to show that it is present in solution. Use coefficients to show the number of each ion present.
Explanation:
Hope this helps and I hope you have a wonderful day! Spread the love!
Which noble gases is closest to magnesium? On the periodic table? What must happen if a magnesium atom for it to have an electron arrangement similar to that of a noble gas?
Answer:
Neon and loose electrons
Explanation:
Magnesium has an electron configuration of 2e 8e 2e, and Neon is 2e,8e. For Mg to have a similar electron arrangement it must loose its two valence electrons and make it an ion.
Answer:
Noble neon gas is the closest.
Explanation:
noble Neon gas
The Magnesium would have to lose two electrons
Which of the following is always involved in a scientific inquiry? A. conducting experiments based on scientific questions B. guessing what would happen instead of doing experiments C. knowing the correct answer before you start D. conducting surveys to ask people's opinions on various subjects
Answer:
I'm pretty sure it's a I'd its wrong I'm sorry
Answer:
developing solutions to questions through scientific research
Explanation:
Scientific inquiry involves coming up with questions based on observation and reasoning, conducting experiments based on scientific questions,and developing solutions to questions through scientific research.
If anyone have the answers to this plz tell me
Explanation:
hey can I please get the passage so that I can help you
How
myny moles are present in 5.6x1022 atoms of Ne? (0.09 moles Ne)
Sot ne10.05
Answer:
mole = no of atoms/ 6.02E23.... so therefore answer= 5.6E22/6.02E23= 0.093✨
I WILL GIVE YOU BRAINLIEST!!!
which sentence uses emitting correctly
A after emitting his mistake, Charlie vowed to make things better.
B Charlie should be emitting an apology.
C Charlie heard birds emitting a very strange sound.
D the emitting sound of an early moring birds woke charlie.
Answer:
its either A or C
Explanation:
Q) which sentence uses emitting correctly ?
Answer :(c) Charlie heard birds emitting a very strange sound .Explanation :
Emitting means ' to give off ' , since birds are giving off a strange sound , we say " Charlie heard birds emitting a very strange sound " .
there are 20 _______ amino acids (9)
(fill in the blank)
Answer: different
Explanation: There are 20 different amino acids.
Which student is responses are correct?
Answer:
Neutrons: Electron cloud
Explanation:
How does sediment form?
Molten rock cools below Earth’s surface.
Chemical changes cause sediment to cement together.
Loose material is compacted by pressure.
Weathering breaks down rock and other material.
i will give brainlest also if this get answer becuase i said this no one should have to say that but i will
Answer:
Loose Material is compacted by pressure.
state four difference between the series and parallel connection?
Answer:
1- The components in a series circuit are arranged in a single path from one end of supply to another end. However, the multiple components in a parallel circuit are arranged in multiple paths where the two end terminals of the battery.
2- In the series circuit, different voltage exists across each component in the circuit. Whereas in the parallel circuit, the same voltage exists across the multiple components in the circuit.
3- The equivalent resistance in case of a series circuit is always more than the highest value of resistance in the series connection. While the equivalent resistance in the parallel circuit is always less than any of the individual resistances in parallel combination.
4- A fault in one of the components of the series circuit causes hindrance in the operation of a complete circuit. As against fault in a single component in a parallel network do not hinder the functioning of another part of the circuit.
The detection of a fault in case of a series circuit is difficult, but it is quite easy in parallel circuits.
One of the pieces of evidence supporting energy quantization was the line spectra of elements. Why does this demonstrate energy quantization?
a) Photons are packets of energy that act both as a particle and a wave.
b) The spectra is continuous and shows emission at all wavelengths.
c) There are sharp emission lines demonstrating discrete energy levels.
d) All compounds emit light in the ultraviolet and visible regions specifically.
Answer:
c) There are sharp emission lines demonstrating discrete energy levels.
Explanation:
When an element emits energy in the form of radiation, it produces a spectrum of colors on a photographic plate. This spectrum can either be continuous or discrete. In continuous spectrum the spectrum continues without any discrimination between two regions. This represents the continuous emission of radiation, and thus the continuous emission of energy without any break.
On the other hand, the line spectrum consists of discrete and sharp lines, which shows the emission of radiation in a certain amount in a certain time, with a break between emission. Hence, the line spectra supports the quantization of energy.
The correct option is:
c) There are sharp emission lines demonstrating discrete energy levels.
Help fast!
Determine the density of a liquid if it’s mass is 50.5 grams.
Answer:
do we have the volume ?
Explanation:
POSSIBLE POINTS: 26.67
Match the seasons for the Northern Hemisphere, Winter, Spring Summer, Fall to the different points on the diagram
Answer:
vv
Explanation:
Point A: Summer
Point B: Fall
Point C: Winter
Point D: Spring
Urgent help meee ;(((
Answer:
C
Explanation:
A homologous series is a group of molecules with the same general formula and the same functional group.
In dilute aqueous solution, as [H+] increases:
A. pH decreases
B. pOH increases
C. [OH-] decreases
Answer:
B
Explanation:
The answer is B, I hope this helps you!
In the human body, a series of chemical reactions results in the making of energy that is used at both the cellular and organismal levels.
In which course would a person most likely study these chemical reactions?
biochemistry
geochemistry
materials chemistry
physical chemistry
Answer:
It is A: biochemistry
Explanation: i seen there was no answer so i took a chance and surprisingly got it correct
Answer:
e correct option is all of the above
Explanation: