Answer:
298.9 million years ago - 251.902 million years ago
Explanation:
It might be in the 2011 Earth Science Review Packet so maybe go check that out
The diagram at right shows a manometer connected to a flask. The mercury levels are measured in mm. the pressure in the room is 740mmHg. Determine the pressure of the gas in the flask.
on the flask it has 505mm and 465mm
pressure=585...
this is your answer
How many grams of silver chromate will precipitate when 250.0 mL of 0.350 M silver nitrate are added to 250.0 mL of 0.450 M potassium chromate?
Answer:
2 AgNO3(aq) + K2CrO4(aq) Ag2CrO4(s) + 2 KNO3(aq)
Explanation:
0.150 L AgNO3 0.500 moles AgNO3 1 moles Ag2CrO4 331.74 g Ag2CrO4 = 12.4 g Ag2CrO4
1 L 2 moles AgNO3 1 moles Ag2CrO4
0.100 L K2CrO4 0.400 moles K2CrO4 1 moles Ag2CrO4 331.74 g Ag2CrO4 = 13.3 g Ag2CrO4
1 L 1 moles K2CrO4 1 moles Ag2CrO4
50mL of potassium hydroxide (KOH) solution contains 7 grams of potassium hydroxide.
What is the molarity (mol/L) of the potassium hydroxide solution?
Given the atomic masses:
K= 39,0 = 16 and H= 1
Answer:
2.5 mol/L
Explanation:
We'll begin by calculating the number of mole in 7 g of KOH. This can be obtained as follow:
Mass of KOH = 7 g
Molar mass of KOH = 39 + 16 + 1
= 56 g/mol
Mole of KOH =?
Mole = mass /molar mass
Mole of KOH = 7 / 56
Mole of KOH = 0.125 mole
Next, we shall convert 50 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
50 mL = 50 mL × 1 L / 1000 mL
50 mL = 0.05 L
Finally, we shall determine the molarity of the KOH solution. This can be obtained as follow:
Mole of KOH = 0.125 mole
Volume = 0.05 L
Molarity of KOH =?
Molarity = mole / Volume
Molarity of KOH = 0.125 / 0.05
Molarity of KOH = 2.5 mol/L
Thus, the molarity of the KOH solution is 2.5 mol/L
Standard temperature and
pressure (STP) is 273 Kand
[?] atm.
Answer:
Explanation:
273K
1ATM
Answer:
273 K 1 atm
Explanation:
Standard temperature and pressure (STP) is [273] K and [1] atm
A classroom has one triple-beam balance. To complete an experiment, each student must use the balance for 6 minutes. The class meets for 1 hour. How many students can participate in the experiment?
As the class is of 1 hour and and each student uses for 6 minutes so in 1 hour 10 students will use the balance.
What is a balance?
A scale or balance is a device used to measure weight or mass. These are also known as mass scales, weight scales, mass balances, and weight balances.
The traditional scale consists of two plates or bowls suspended at equal distances from a fulcrum. One plate holds an object of unknown mass (or weight), while known masses are added to the other plate until static equilibrium is achieved and the plates level off, which happens when the masses on the two plates are equal.
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an object can be considered in motion when it changes only it's direction. true or false?
Answer:
Its false Because it does'snt only show directions and changes there are others too.
Explanation:
hope it helps!!
Answer:
false
Explanation:
it's false because it's in motion
Thomas collected the data in Table 1 to answer a statistical question. Which statistical question does the data in Table 1 answer?
Answer:
how tall each sibling is
Explanation:
bc it says height
What is the volume of 3.00 M sulfuric aid that contain 9.809 g of H2SO4 (98.09g/mol)
Answer:
[tex]V=0.0333L=33.3 mL[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is necessary for us remember that the molarity is calculated by dividing the moles by the volume of the solution in liters so the volume is calculated by dividing moles by the given molarity. However, we first need to calculate the mole given the mass and molar mass of the solute, H2SO4:
[tex]n=\frac{9.809g}{98.09g/mol}=0.1mol[/tex]
Thus, the volume turns out:
[tex]V=\frac{0.1mol}{3.00mol/L}\\\\V=0.0333L=33.3 mL[/tex]
Regards!
HELP HELP URGENT
STRONG ACIDS AND BASES
Answer:
Solution A is correct.
Explanation:
Strong acids or bases are assumed to dissociate completely when in a aqueous solution.
Researchers are attempting to create a new battery based on the following chemistry and would like the battery to produce 1.0-1.2 volts. Given the standard cell potential of the reaction, they propose to connect 3 identical cells inside the single new battery. Calculate the voltage of this (3-cell) battery at 25 C when 1.3 M Fe and 0.010 M Fe in pH 3.1 buffer react with O at 0.20 atm. (For full credit your answer must be correct to /-0.02.)
Answer:
Hello your question has some missing data attached below is the missing data ( Note: the PH in the attached question is 3.2 but the PH value I used in the solution = 3.1 as requested in the initial question )
answer : 0.41 volts
Explanation:
Given data :
[ Fe²⁺ ] = 1.3 M
[ Fe³⁺ ] = 0.010 M
[ H⁺ ] = 10^3.1
O2 = 0.20 atm
E⁰cell = 0.46 volts
temperature = 25°C ( room temperature )
Calculate the voltage of this ( 3 -cell battery )
we can apply the relation below
E = E⁰cell - ( 0.0591 / n )*Log Q
= 0.46 - ( 0.0591 / 4 )*Log [ (0.01)^4 / (1.3)^4 * (10^3.1)^4 * 0.2 ]
= 0.4120 Volts
Note : Q is determined from the equation attached to the question
A dairy is mainly involved in the operations of bottling of milk, making ice-cream and limited production of cheese. Calculate the BOD produced per 1000kg of milk processed and its population equivalent from the following data;
Quantity of milk processed daily=150000kg Waste water produced daily =240m3 BOO of waste water =1400mg/I Population equivalent per capita per day of 5-days BOD at 20C°=75g
Answer:
BOD produced per 1000kg of milk processed = (1400mg/I x 240m3) / 150000kg = 0.192mg/I
Population equivalent = (0.192mg/I x 75g) / 5 = 0.576g
Explanation:
You have used 310 L of distilled water for a dialysis patient. How many gallons of water is that?
Answer:
82 gallons
Explanation:
There are 3.785 liters in one gallon. In order to get the amount of gallons, divide the amount of liters by 3.785.
310 L ÷ 3.785 L/gal = 81.89 gallons ≈ 82 gallons
Q13 Which compound has a boiling point that is influenced by hydrogen bonding?
A CH3CHO
B CH3OCH3
C HCO2H
D HCO2CH3
Answer:
[tex]A. \: \: CH _{3}CHO[/tex]
ethanal
This is because hydrogen is bonded with oxygen atom which is highly electronegative.
help me i need it asap
Which example is a biotic factor of an aquarium ecosystem?
plastic plants placed in the gravel
algae growing on the glass
rock structure
gravel on the bottom of the aquarium
Which examples are an abiotic factor of an aquarium ecosystem? Select all that apply.
rock structure
temperature of the water
amount of algae on the glass
number of fish
Which example describes an abiotic factor interacting with a biotic factor?
The temperature of the air affecting the wind direction
Water eroding a rock
Cows eating nearby grass
The amount of sunlight affecting the growth of a plant.
Students in Ms. Brown's class are making observations in the garden outside of the school. They make a list of all the abiotic and biotic factors in their notebook. Part of the list is below:
Gravel
Grass
Butterfly
Sunflower
Bird feeder
Flowerpots
Which items on the list are a part of the garden ecosystem?
Grass, butterfly, sunflower
None of the listed items are a part of the ecosystem
All the listed items are part of the ecosystem
Gravel, bird feeder, flowerpots
The biotic factor of an aquarium ecosystem is algae growing on the glass.
The abiotic factors of an aquarium ecosystem are rock structure, temperature of the water, and amount of sunlight.
The example that describes an abiotic factor interacting with a biotic factor is the amount of sunlight affecting the growth of a plant.
All the listed items in Ms. Brown's class, including gravel, grass, butterfly, sunflower, bird feeder, and flowerpots, are a part of the garden ecosystem.
What is an ecosystem?An ecosystem is a community of living organisms (biotic factors) interacting with each other and with their physical environment (abiotic factors) in a specific area. It includes all the living and non-living components of the environment that interact with each other. Examples of ecosystems include a coral reef, a forest, a desert, and even an aquarium or a garden. Ecosystems can be large or small and can be found on land or in water. They are essential for the survival of living organisms as they provide food, shelter, and other resources necessary for life.
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What is an extinction event
What is the number of moles in 0.025 g (NH4)2Cr2O7?
A) 1.5 x 1022
B) 4.2 x 10-26
C) 6.3
D) 1.0 x 10-4
E) 1.0 x 104
Answer: D
Explanation:
d
The number of moles in 0.025 g of (NH[tex]_4[/tex])[tex]_2[/tex]Cr[tex]_2[/tex]O[tex]_7[/tex] is 1.0 x 10⁻⁴moles. The word "mole" is shortened to "mol".
What is mole?A mole is just a measuring scale. In reality, it's one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The mole is indeed a SI unit that is used to quantify any quantity of a material. The word "mole" is shortened to "mol". Exact number of particles in one mole is 6.0221407610 23.
The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear. To fill this gap between extremely small and extremely huge numbers, scientists created the mole.
number of mole of (NH[tex]_4[/tex])[tex]_2[/tex]Cr[tex]_2[/tex]O[tex]_7[/tex] = given mass / molar mass
= 0.025 / 252.07
=9.91 × 10⁻⁵moles
= 1.0 x 10⁻⁴moles
Therefore, the correct option is option D
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Depression in freezing point of non-electrolyte solution containing 29.5 g of a substance in 100 g of water is 1.6 K. Determine the molar weight of the substance. (Cryometry).
The depression in freezing point of the electrolyte is 1.6 K. The weight of the solute added is 29.5 g. Then the molar mass of the compound is obtained to be 342.93 g/mol.
What is depression in freezing point?Addition of a non-volatile solute into a solvent decreases the freezing point of the solution. The depression in freezing point is calculated as follows:
ΔT = W₂ 1000 Kf / (M W₁)
where W₂ be the mass of solute and W₁ is that of solvent, Kf is called molal depression constant. M be the molar mass of the solute.
Given ΔT = 1.6 K
W₂ = 29.5 g
W₁ = 100 g
Kf of water = 1.86 K/m
Then M = W₂ 1000 Kf / ( ΔT W₁)
M = 29.5 g× 1000 × 1.86 / (1.6 K × 100 g) = 342.9 g/mol
Thus, the molar mass of the solute is 342.9 g/mol.
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What does a group of atoms joined by chemical bonds create?
•A molecule
O A compound
O A fission reaction
O A fusion reaction
Answer:
I can say that it is not a compound because I got it wrong
Explanation:
Answer:
MoleculeExplanation:
I took the test
Under the right conditions aluminum will react with chlorine to produce aluminium chloride.
2 Al +3 Cl2 - 2 AlCl3
How many grams of aluminum chloride can be produced when 157.0g of aluminum react with excess chlorine?
CORRECT ANSWER IS 775.9 g AICI3 but what are the steps to get that answer ?
Answer:
Ok
The Limiting reagent is Aluminum. Its not in excess. So the reaction ends once its exhausted. So all Aluminum will be used up
From the question ....
157g of Al
Find the number if reacting Moles...
M=mass/molar mass
M= 157/27
=5.81moles of Aluminum is reacting.
Now looking at the equation of reaction(Always make sure its balanced)...
2moles of Al react to produce 2 Moles of AlCl3
Their Mole ratio is equal
Since their Mole ratio is equal 2:2.... That means... That 5.81moles of AlCl3 would be produced because the mole of Al is 5.81
So We now know the Moles of AlCL3 produced
getting the Mass won't be difficult.
Again
Mole=Mass/Mm
Mass = Mole x Mm(Molar Mass)
Mass of AlCl3 = 5.81 x (27 + 35.5x3)
Note: The arithmetic done in the parenthesis is the molar mass of AlCl3
Mass of AlCl3 = 5.81 x 133.5
=775.63g of AlCl3.
Have a great Day!!!!
Scientists found the remains of dinosaur fossils in a remote section in the west, located
within ten miles of a meteor crash site. Which statement can be made about the
dinosaur and the meteor?
O a. The dinosaur could have died from a flood.
O b. The dinosaur and the meteor are not related.
O c. The dinosaur could have died from freezing to death.
O d. The dinosaur could have died due to an meteor crash.
Answer:
D The dinosaur could have died due to an meteor crash.
Explanation:
Answer:
D
Explanation:
The dinosaurs fossils were found ten miles away from the meteor crash site. Correct me if I'm wrong
Within an ecosystem,there are levels of organization. Which levels are missing from the diagram below?
Answer:
the missing levels are "population, community"
Which statement best describes general equilibrium? Equilibrium is reached when the reaction stops. There is only one set of equilibrium concentrations that equals the Kc value. At equilibrium, the rate of the forward reaction is the same as the rate of the reverse reaction. At equilibrium, the total concentration of products equals the total concentration of reactants.
Answer: The statement 'At equilibrium, the rate of the forward reaction is the same as the rate of the reverse reaction' best describes general equilibrium.
Explanation:
A chemical process in which the rate of forward reaction is equal to the rate of backward reaction.
For example, [tex]A + B \rightleftharpoons C + D[/tex]
This reaction is an equilibrium process. Symbol which represents the equilibrium is '[tex]\rightleftharpoons[/tex]'.
Thus, we can conclude that the statement 'At equilibrium, the rate of the forward reaction is the same as the rate of the reverse reaction' best describes general equilibrium.
Put the levels of ecosystems in order from smallest to largest:
ecosystem, community, individual, population
Reorder answers
1.population
2.ecosystem
3.individual
4.community
No FILES PLZZ
What can all non-renewable resources theoretically be?
A
converted to nonmetallic minerals
B
converted to renewable ones
exhausted or depleted
D
recycled or reused
Answer:
B.
Converted to renewable ones
exhausted or depleted
[H3O+] = 3.6 x 10-2 M
Answer:
Explanation:
Hello there!
In this case, since this concentration of hydronium ions is given, we infer we may calculate that of the hydroxide ions, pH and pOH because no question was specifically given. That is why we proceed as follows:
- pH: Here, we use this concentration to calculate the pH according to the negative logarithm:
[tex]pH=-log(3.6x10^{-2})=1.44[/tex]
Which means that the solution is acidic as the pH is less than 7.
- pOH: since the pH added to the pOH is 14, we can calculate the latter as follows:
[tex]pOH=14-1.44=12.56[/tex]
- Hydroxide concentration: Given the pOH, we apply the antilogarithm to calculate such concentration as shown below:
[tex][OH^-]=10^{-pOH}=10^{12.56}=2.75x10^{-13}M[/tex]
Keep in mind, this is an arbitrary solution because no question was provided.
Regards!
I need help with how to do question c, d, and e
The answer of the following question of concentration are:
c) The law expression for this reaction is k[A].
d) The value of k including its units is on the specific reaction.
e) The half-life of the reaction is T1/2 = 0.693/k.
What is concentration?
Concentration in chemistry is a measure of the amount of a substance that is present in a given volume. It is usually expressed in terms of mass, moles, or volume.
c) The law expression for this reaction is rate = k[A], where k is the rate constant. This is because in a first-order reaction, the rate of reaction is proportional to the concentration of the reactant.
d) The value of k depends on the specific reaction, and can be determined by measuring the reaction rate at different concentrations of A and plotting a graph of rate versus concentration of A.
e) The half-life of a first-order reaction is given by T1/2 = 0.693/k, where T1/2 is the half-life and k is the rate constant. The units of the half-life are seconds.
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state types of environment pollution?
Answer:
Air Pollution.
Water Pollution.
Soil/Land Pollution.
Noise Pollution.
Radioactive Pollution.
Explanation:
A certain compound consists of 54.53% C, 9.15% H, and 36.32% O by mass. The molar mass of the compound is 88.10g/mol, What is the molecular formula of this compound?
The compound is going to have the molecular formula; [tex]C_{4} H_{8}O_{2}[/tex]
What is the molecular formula?We know that the molecular formula is the formula of the compound that shows the number of the atoms of each of the elements that we can be able to find in the compound.
Now for the compound that we have, we divide through by the relative atomic mass of each;
C - 54.53/12 H - 9.15/1 O - 36.32/16
C - 4.5 H - 9.15 O - 2.27
Dividing through by the lowest ratio;
C - 4.5/2.27 H - 9.15/2.27 O - 2.27/2.27
C - 2 H - 4 O -1
The empirical formula is [tex]C_{2} H_{4} O[/tex]
We now have;
[2(12) + 4(1) + 16] n= 88.1
n = 88.1/44
n = 2
The molecular formula is;
[tex]C_{4} H_{8}O_{2}[/tex]
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A solution is prepared by dissolving 51 g of salt in 340 g of
water. What is the mass percent of salt?
Answer:
okķkkkkkkkkkkkkkkkkkkkkk.I don't know the answer. GIVE THANKS
Constant Volume
A 10.0L sample of gas in a rigid container at 1.00 atom and 200K is heated to
800K. Assuming that volume remains constant, what is the new pressure of the gas?
After
Can someone help me please
According to the question the new pressure of the gas is: 6.5512 kPa
What is pressure?
Pressure is the force applied to a surface divided by the area of the surface on which the force is applied. It is measured in units of force per unit area, such as pounds per square inch (psi) or pascals (Pa). Pressure can be caused by a variety of factors, such as the weight of air, the weight of a liquid, or the force of a gas. Pressure is an important concept in many fields, including physics, engineering, and chemistry.
The ideal gas law can be used to determine the gas's new pressure:
PV = nRT
where R is the universal gas constant, n is the number of moles, P is the pressure, V is the volume, and T is the temperature.
We know that V = 10.0L, n = 1.00 mole, R = 8.314 J/molK, and T = 800K.
As a result, the gas's new pressure is:
P = (1.00 mol * 8.314 J/molK * 800K) / 10.0L = 6.5512 kPa
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