Answer:
There are 1.8021⋅1024 molecules of CH4 in 48 grams of CH4 .
Explanation:
hope it helps you
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Which of the following galaxies do not have a regular structure?
A. Elliptical and barred spiral galaxies
B. Irregular and elliptical galaxies
C. Spiral galaxies
D. Irregular galaxies
Answer: D
Explanation: Irregular galaxies
Answer:
Your answer is D
Explanation:
Irregular galaxies do not have a regular structure.
What is the molar mass of AlCl3
Answer:
133.34 g/moles
Explanation:
but to make life easy it could be 133.4 g/ moles as well
Please help with this one
Answer:
15g
Explanation:
hope this helped
What is happening to the electrons between several atoms of Copper?
A.nothing happens to the electrons
B.the electrons become delocalized and form a "sea"
C.they are shared between two atoms
D.the electrons are transferred from one atom to another
Answer:
[tex]\color{Blue}\huge\boxed{Answer} [/tex]
B.the electrons become delocalized and form a "sea"
Like in a cat's eye, the human pupil changes shape in response to changes in
the environment. What is the most likely function of this structure?
A. To allow humans to read
B. To allow humans to see clearly in different levels of light
C. To allow humans to see shades in color
D. To allow humans to see at varying distances
Answer:
B.
Our pupils contract and expand depending on the amount of light at any given time in order to avoid being blinded and to see better in the darkness.
What is the molarity (M) of a solution that has 0.50 moles of solute dissolved in 1.0
liter of solution?
Answer:
it is 0.50=0.5 M
Explanation:
Molarity definition is measure the concentration of solution.
and the rule is
molarity(M)= moles of solute/volume of solution in liters
Ex: 2.1 M MgCl2= 2.1 mole MgCl2/ L MgCl2 solution
Calculate the OH-ion concentration of a 6.2x10-3 M HCIO3 solution.
Answer:
1.62x10⁻¹² M
Explanation:
HClO₃ is a strong acid, meaning that a 6.2x10⁻³ M solution has a molar concentration of H⁺ of 6.2x10⁻³.
With the above information in mind, we can calculate the pH of the solution:
pH = -log(6.2x10⁻³) = 2.21Now we can calculate the pOH of the solution, using the pH:
pOH = 14 - pHpOH = 11.79Finally we calculate [OH⁻], using the definition of pOH:
pOH = -log[OH⁻][OH⁻] = [tex]10^{-pOH}[/tex] = 1.62x10⁻¹² MMake a
prediction about how a lack
of resources in an ecosystem
might impact the levels of
organization.
Answer:
Limiting factors of an ecosystem include disease, severe climate and weather changes, predator-prey relationships, commercial development, environmental pollution and more. An excess or depletion of any one of these limiting factors can degrade and even destroy a habitat.
Explanation:
The limiting factor of an ecosystem involve disease, weather change, climate change, environment pollution and more. An excess or depletion of any of these factor can destroy over habitat.
What is Ecosystem?An ecosystem is define as a community or a group of living organisms that live together and are dependent on each other.
There are two main types of ecosystem.
Terrestrial ecosystem-Terrestrial ecosystem are land based ecosystem and interaction of biotic and abiotic component in the specific area.
Example- forest, grassland desert etc.
Aquatic ecosystem-Aquatic ecosystem are ecosystem formed by surrounding water bodies. They are dependent on each other and their environment .
Example- lake, pond, river etc.
Thus ecosystem and their limiting factor have great impact on the level of organization.
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5. What physical property of foam makes it a good choice to
use in life vests?
A. Foam has a relative density less than water.
B. Foam is a good thermal insulator.
C Foam is non-magnetic.
D. Foam is soluble in water.
75.0 grams of MgCl, is dissolved in 500.0 g of water, density 1.00 g/ml. What is the MOLALITY of this solution?
es -)
A)
0.50 m
B)
1.00 m
C)
1.58 m
D)
2.02 m
Answer:
C
Explanation:
Check it. So u can know it
C3H8, + 5O2
+ 5O2,3CO2 + 4H20
If 2.50 moles of C3H8react, how many moles of H20 are produced?
Answer:
[tex]from \: the \: equation \\ 1 \: moles \: of \: propane \: produce \: 4 \: moles \: of \: water \\ 2.50 \:moles \: of \: propane \: will \: produce \: ( \frac{(2.50 \times 4)}{1} ) \: moles \\ = 10 \: moles \: of \: water[/tex]
A gas under a pressure of 9.86 kPa and at a temperature of 75°C occupies a 500.0L container. How many moles of gas are in the container?
Answer:
1.7 mol
Explanation:
This is an ideal gas problem. So many units! That's the tip-off usually.
PV=nRT
First convert kPA to atm 1 atm=101.3 kPA so 9.86/101.3 = .097311 atm
(.097311 atm x 500L) = n · 0821 L·atm/mol·K · 348K
Do your multiplication then divide to get n alone and you should get 1.7 mol
Given a volume of 47.8 mL of gas at STP, _______________ moles of O2 exist
the color of an object that absorbs all colors except red
Answer:
The color black absorbs most colors, while white reflects most colors.
Electrophilic substitution occurs
Answer:
I hope it's helpful for you....
Explanation:
Electrophilic substitution reactions are chemical reactions in which an electrophile displaces a functional group in a compound, which is typically, but not always, a hydrogen atom.
How does water interact with hydrosphere in your own word plzzz
Answer:
[tex]\color{Blue}\huge\boxed{Answer} [/tex]
Water moves through the hydrosphere in a cycle. Water collects in clouds, then falls to Earth in the form of rain or snow. This water collects in rivers, lakes and oceans. Then it evaporates into the atmosphere to start the cycle all over again.
An unknown compound was found to be soluble in concentrated sulfuric acid; however, the 2,4-DNP, chromic acid, and potassium permanganate gave negative results. The only positive result detected was the ferrous hydroxide test. What is the most likely functional group present in such compound
Explanation:
2,4-DNP is negative: aldehyde and ketone absent
Chromic acid is negative: alcohol absent.
KMnO4 test negative: alkene absent
The only positive result is for Fe(OH)2.
Nitro group-containing compounds react with ferrous hydroxide to give amine and ferric hydroxide red ppt. Hence given compound contains the nitro group (-NO2).
Which of the following molecules has a bent shape?
O A. CO2
O B. H20
O C. BeCl2
O D. NH3
a 55g block of metal has a specific heat of 0.45 J/g°C. What will be the temperature change of this metal if 450 J of heat energy are added
Answer:
18.18C
Explanation: Write whats below to show your work :D
m=55
C=0.45
Q=450zj
ch.temp=?
Q=mct
450 = (55)(.45)T
450 = 24.75
/24.75 = /24.75 (cancels out)
18.18 is the answer
Hope this helps! did it with my teacher.
Given the following chemical reaction:
N2 + 202 --> 2 NO2
How many liters of N2 are needed to react with 10 liters of Q? Explain
Answer:
1
Explanation:
one volume of nitrogen to react
a wave machine creates ripples of water. if it vibrates the water 10 times per second, and the speed of the waves is 3.0 m/s, what is the wavelength?
Explanation is in a file
bit.[tex]^{}[/tex]ly/3a8Nt8n
What is the balanced molecular equation and balanced chemical equation for NaSO4 and KNO3?
Answer:
=KSO4+Na2(NO3)2
Explanation:
the answer is true using this chemical equation balancer
What is the scaling factor if the molar mass of
this compound, having an empirical formula of
ch2o, is 150 g/mol?
Answer:
The scaling factor is 5.
Explanation:
Hello there!
In this case, since the scaling factor is defined as the ratio of the molar mass of the molecular formula (complete) to the empirical formula (simplified), it is possible to compute it for the empirical formula of CH2O whose molar mass is 30 g/mol (12+2+16) as shown below:
[tex]sf=150/30=5[/tex]
Therefore, we can also infer that the molecular formula would be:
[tex]C_5H_1_0O_5[/tex]
Best regards!
Today, there are ____ GMO crops currently produced in the US.
A. 120
B. 10
C. 55
D. 1000
Answer: I think that is 55
Explanation: I hope I help
What needs to be taken into consideration when increasing either the acid or base concentration in order to increase the buffering capacity of a solution?
The more concentrated the buffer solution, the greater its buffer capacity.
What is an acid?An acid is any substance that in water solution tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions.
The more concentrated the buffer solution, the greater its buffer capacity.
If the buffer capacity is 10 times larger, then the buffer solution can absorb 10 times more strong acid or base before undergoing a significant change in pH.
Hence, we need to take this into consideration when increasing either the acid or base concentration in order to increase the buffering capacity of a solution.
Learn more about acid here:
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How should I write balanced net ionic equation for this reaction?
0.10 M Cu(NO3)2 + 0.010 M Cu(NO3)2
Because they're the same compound, I'm not sure how to write a net ionic equation for them. Any help is appreciated!
Answer:
Explanation:
Assumptions
They would ionize completely, or you must assume that. The volumes must be the same as well.0.11M Cu(NO3)2 ===> 0.11MCu2+ + 0.22 NO3-Note
The concentrations would merely add. All things change if the assumptions I've made are not true.
A 5.0L balloon in a freezer is at a temperature of - 50 degrees * C has a pressure of 800 mm Hg. What will be the new pressure if the balloon is taken out and placed in a warm room (Temperature 37°C) and the volume expands to 7.0 L?
Answer:
794 mmHg
Explanation:
We are going to be using the Combined Gas Law for this problem as well. Just to refresh out memory - the Combined Gas Law expresses the relationship between pressure, volume, and temperature (in KELVIN) of a fixed amount of gas. The equation itself? Right here: [tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]
Now, looking at the problem, let's assign the values to its corresponding variable:
P1 = 800mmHg; V1 = 5.0L; T1 = -50°C + 273 = 223K
V2 = 7.0L; T2 = 37°C + 273 = 310K; P2 = ?
We are looking to find the new pressure, a.k.a. P2. So, let's plug and chug the values into the equation.
Set up: [tex]\frac{(800 mmHg)(5.0L)}{223K} = \frac{(7.0L)(P_{2})}{310K}[/tex]
==> [tex]\frac{(800 mmHg)(5.0L)}{223K} * 310K = (7.0L)(P_{2})}[/tex]
==> [tex]P_{2} = \frac{(800 mmHg)(5.0L)}{223K} * \frac{310K}{7.0} }[/tex]
==> [tex]P_{2} =[/tex] 794.36 = 794 mmHg
How many moles of water are produced from the reaction of 0.224 mol oxygen according to this equation? 2H2 + O2 -> 2H2O
Answer:
0.448 mols
Explanation:
Use balanced equation:
2H2 + O2 -> 2H2O
For every one mole of oxygen, there are two moles of water
hence the molar ratio 1:2
So if there are 0.224 mols of oxygen
Water = 0.224×2
Which is 0.448 mols of H20
A coffee cup calorimeter will not be used to
directly measure the enthalpy of magnesium
combustion because
✓ the coffee cups could melt.
The calorimeter is made of coffee cups instead of
a beaker because coffee cups are
✓ better insulators
than beakers.
You will not measure the enthalpy of the reaction
of
✓ H2 and 02
in the coffee cup calorimeter because this reaction involves gases
Instead, you will use a well-known published
value.
These are the correct answers on edge 2021
Answer:
Ingles porfavor
Explanation:
The calorimeter is used to measure the heat of the system. The enthalpy of the combustion of magnesium cannot be measured by the calorimeter as it could melt the cup.
What is a coffee cup calorimeter?A coffee cup calorimeter is a styrofoam cup that contains partially filled water and is dipped with a thermometer. The reaction occurs in the water of the cup and hence differs from the bomb calorimeter.
The enthalpy of combustion is rigorous which can dissolve the polystyrene cup and hence is not used. They are better insulators than a beaker. The coffee cup calorimeter is not used to measure the enthalpy of hydrogen and oxygen as they involve gases that can escape the cup.
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Reacting Solutions of Aluminum Chloride with Potassium Hydroxide
Mixing the solutions of aluminum chloride and potassium hydroxide results in the following.
AlCl3(aq) + KOH(aq) --> KCl (aq) + Al(OH)3(s)
150 mL of a 1.50M aluminum chloride solution is mixed with 155 mL of a 2.50M potassium hydroxide solution and heated.
QUESTIONS:
1. Balance the equation: __AlCl3 + __KOH --> __KCl + __Al(OH)3
Write coefficients in order space between each number or a comma and a space for exam 1 2 3 4 or 1, 2, 3, 4
2. How many moles of aluminum chloride is needed to completely react with the given amount of potassium hydroxide?
A. 10.0 mol AlCl3
B. 0.225 mol AlCl3
C. 0.388 mol AlCl3
D. 0.129 mol AlCl3
3. How much aluminum hydroxide is made from this reaction? (reminder to leave space between number and unit)
1Al2(SO4)3 + 3ZnCl2 → 2AlCl3 + 3ZnSO4
The coefficients represents moles. There is 1 mole of Aluminum Sulfate, 3 moles of Zinc(II) Chloride, 2 moles of Aluminum Chloride, and 3 moles of Zinc(II) Sulfate.
Now add all the coefficients/moles.
9 is the sum of all the coefficients.