Answer: -241.82 kj
Explanation:
answer: -241.82 then 483.64
Explanation:
Libby has a mass of 45 kg in space, her mass would be:
More than 45 kg
Exactly 45 kg
Less than 45 kg
In the picture, the different shapes (circle, triangle, and a square) represent different elements. Which of the following represents a pure substance?
A) Figure W&X
B)Figure W&Y
C) figure Z&Y
D) figure Z&W
Answer:
A
Explanation:
1. ____________ refers to the nonliving parts of an ecosystem. Biotic Abiotic 2. ___________ refers to the living parts of an ecosystem. Biotic Abiotic
3. Parasitic diseases and predator/prey relationships are all examples of __________ factors in an ecosystem. biotic abiotic
Answer:
1. Abiotic
2. Biotic
3. Biotic
Explanation:
Abiotic includes nonliving.
Biotic includes living.
Answer:
abiotic
biotic
abiotic
Explanation:
15. How many grams of sulfur are in 8.5 moles of S?
What quantity is shown by the slope?
the mass of a fluid
the volume of a fluid
the weight of a fluid
the density of a fluid
Answer:
density of a fluid
Explanation:
In the energy pyramid, if a primary producer is consumed by a first-level consumer, and that first-level consumer is consumed by a
second-level consumer and the second-level consumer is consumed by a third-level consumer, how much energy is stored by the
third-level consumer from the primary producer?
0.1%
4.09
109
40%
Answer:
0.1%
Explanation:
Why did Boyle think that chemistry was the key to understanding?
Answer:
Explanation:
Boyle believed that chemistry – the behavior of substances – could be explained through the motion of atoms, which in turn could be understood through mechanics – Galileo's mathematics of motion. Boyle was ultimately proved correct, because today we can understand chemistry mathematically, through quantum mechanics.
How many moles of argon are in 30.6L at 28K and 658 mmHg?
Answer : The number of moles of argon gas is, 11.5 mol
Explanation :
To calculate the moles of argon we are using ideal gas equation as:
[tex]PV=nRT[/tex]
where,
P = pressure of argon gas = 658 mmHg = 0.866 atm (1 atm = 760 mmHg)
V = volume of argon gas = 30.6 L
n = number of moles of argon gas = ?
R = gas constant = 0.0821 L.atm/mol.K
T = temperature of argon gas = 28 K
Now put all the given values in the above formula, we get:
[tex](0.866atm)\times (30.6L)=n\times (0.0821 L.atm/mol.K)\times (28K)[/tex]
[tex]n=11.5mol[/tex]
Therefore, the number of moles of argon gas is, 11.5 mol
How does heat move?
from a warmer to a colder object
toward a hot object
from a cooler to a warmer object
away from a cold object
If I dissolve sugar in water, what is the solution?
Answer:
When you stir a spoonful of sugar into a glass of water, you are forming a solution. This type of liquid solution is composed of a solid solute, which is the sugar, and a liquid solvent, which is the water. As the sugar molecules spread evenly throughout the water, the sugar dissolves.
You add 31.65 g of a non-electrolyte solute to 220.0 mL of water to cook Mac and Cheese. How much hotter will the water be? The molar mass of the solute is 180.18 g/mol and the density of water is 1.0 g/m
a) 0.004072^{\circ}C
b) 100.4^{\circ}C
c) 73.37^{\circ}C
d) 0.4072^{\circ}C
100.4 degree celsius is the temperature of the water having non-electrolyte.
The correct answer is b.
Explanation:
Data given:
mass of non-electrolyte solute = 31.65 grams
volume of water = 220 ml or 0.22 litres
molar mass of solute = 180.18 grams/mole
density of water = 1 gm/mole
Boiling point of water = 100 degrees celsius
molality = ?
Kb for water = 0.51
boiling point elevation or temperature of hot water,T =?
Formula used:
T = mKb equation 1
number of moles of non electrolyte = [tex]\frac{31.65}{180.18}[/tex]
number of moles = 0.17 moles
molality = [tex]\frac{0.17}{0.22}[/tex]
molality = 0.77 M
putting the values in equation 1
T = 0.77 X 0.51
T = 0.392 degree celsius. is the elevation in temperature when solute is added.
Temperature of the hot water = 100 +0.392
= 100.392 degree celsius.
How do particles in matter change when a substance becomes hotter, cool down, or changes state?
Answer:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
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When a substance gets hotter, its particles move faster and spread out, causing it to expand. When it cools down, its particles slow down and come closer together, which causes it to contract. When a substance changes state, the arrangement and movement of its particles also change in a significant way.
Explanation:The particles of matter are always moving. When a substance becomes hotter, its particles move faster and generally spread out, resulting in an increase in volume. This is often referred to as thermal expansion.
When a substance cools down, its particles move slower and come closer together, which usually means a decrease in volume. This is called contraction.
When a substance changes state, the arrangement and movement of particles change significantly. For example, when water (a liquid) freezes into ice (a solid), its particles slow down and take on a fixed, orderly pattern. When ice melts back into the water, its particles speed up and move past each other more freely. When water boils into steam (a gas), its particles move even faster and are much further apart.
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You have 34.1 x 1023 molecules of O2. How many moles of O2 do you have? Fill in the grid. Then, solve the problem and answer the question. Remember to include units!
Number of moles = 5.7 moles of oxygen.
Explanation:
We have to convert number of molecules into number of moles by dividing the number of molecules by Avogadro's number.
Here number of molecules of oxygen given is 34.1 × 10²³ molecules.
Now we have to divide the number of molecules by Avogadro's number as,
Number of moles = [tex]$\frac{number of molecules}{Avogadro's number}[/tex]
= [tex]$\frac{34.1}{6.022} \times \frac{10^{23} }{10^{23} }[/tex]
= 5.7 moles
So here molecules is converted into moles.
What diet do bearded dragons thrive on?
Vegetables and insects
Fruits and vegetables
Fruit and insects
Insects only
Answer:
The first one
Explanation:
Hope this helps :)
Answer:
vegetables and insects
Explanation: bearded dragon are most likely to thrive off of vegetables and insects due to the nutrients of both.
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12.0 of .500 M NaOH neutralized 6.0 ml of HCl solution. What was the molarity of the HCl
The molarity of the HCl is 1 M when 12.0 of .500 M NaOH neutralized 6.0 ml of HCl solution.
Explanation:
Data given:
molarity of the base NaOH, Mbase =0. 5 M
volume of the base NaOH, Vbase = 12 ml
volume of the acid, Vacid = 6 ml
molarity of the acid, Macid = ?
The titration formula for acid and base is given as:
Mbase Vbase = Macid Vacid
Macid =[tex]\frac{0. 5 X 12}{6}[/tex]
Macid = 1 M
we can see that 1 M solution of HCl was used to neutralize the basic solution of NaOH. The volume of NaOH is 12 ml and volume of HCl used is 6ml.
Which of the following systems has potential energy only?
Select one:
a car screeching to a halt
an airplane flying above
a stone falling off a cliff
a bird sitting on a branch
Answer:
a bird sitting on a branch
What is the food manufacturing process in plants called?
Answer:
the answer is photosynthesis
Answer:
Plants make food by a process known as photosynthesis. As the name suggests, photo or light energy is used in this process of synthesis. Plants use three ingredients: sun light, carbon dioxide (CO2) and water (H2O) to make food (sugars). The following takes place during photosynthesis:
6CO_2 + 6H_2O + (light) -> C_6H_(12)O_6 + 6)_2
what's a closed system?Explain
Answer:
A physical system
Explanation:
It doesn't allow certain types of transfers, though the transfer of energy is permitted.
Carbon dioxide subliming is an example of which of the following?
O A. Mass change
O B. Chemical change
O C. Nuclear change
O
D. Physical change
Final answer:
Carbon dioxide subliming is a physical change, which is a phase transition from solid to gas without altering the substance's molecular structure.
Explanation:
Carbon dioxide subliming is an example of a physical change. Sublimation is the process where a substance changes from a solid to a gas without going through the liquid phase. In this case, solid carbon dioxide (also known as dry ice) directly becomes carbon dioxide gas. During sublimation, there is an energy change associated with the phase change, but the molecular structure of the substance does not change. Therefore, sublimation is categorized as a physical change rather than a chemical change or any other type of change like mass or nuclear.
Carbon dioxide subliming, which is the direct phase change from solid to gas, is an example of a physical change. Sublimation occurs when a compound's vapor pressure equals its applied pressure, and most solids do not easily sublime unless they have weak intermolecular forces.
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What percentage of a substance remains after 7 half-lives have passed?
2.5
1.25
0.78
0.39
After 7 half-lives, 0.78% of a substance remains. This is calculated by taking 0.5 to the power of 7, as each half-life represents a 50% reduction of the remaining substance from the previous amount.
To determine what percentage of a substance remains after 7 half-lives, you can calculate the remaining quantity using the principle that after each half-life, only 50% of the substance remains from the previous amount. So after 1 half-life, 50% remains; after 2 half-lives, 25% remains (which is 50% of 50%); and this process continues.
To find the remaining percentage after 7 half-lives, you would calculate (0.5)^7. That means you take 0.5 (half of the substance) and multiply it by itself 7 times. The calculation will look like this: 0.5 x 0.5 x 0.5 x 0.5 x 0.5 x 0.5 x 0.5 = 0.0078125, which is 0.78125%. You can round this to 0.78%, which is the closest answer to the options given and would be the correct choice.
In a laboratory experiment, the freezing point of an aqueous solution of glucose is found to be -0.325°C, What is the molal concentration of this solution?
0.17 M is the is the molal concentration of this solution
Explanation:
Data given:
freezing point of glucose solution = -0.325 degree celsius
molal concentration of the solution =?
solution is of glucose=?
atomic mass of glucose = 180.01 grams/mole
freezing point of glucose = 146 degrees
freezing point of water = 0 degrees
Kf of glucose = 1.86 °C
ΔT = (freezing point of solvent) - (freezing point of solution)
ΔT = 0.325 degree celsius
molality =?
ΔT = Kfm
rearranging the equation:
m = [tex]\frac{0.325}{1.86}[/tex]
m= 0.17 M
molal concentration of the glucose solution is 0.17 M
The molal concentration of an aqueous glucose solution with a freezing point of -0.325°C is 0.175 mol/kg, calculated using the freezing point depression formula.
To find the molal concentration of the aqueous solution of glucose, we can use the formula for the freezing point depression ΔTf = i * Kf * m, where ΔTf is the change in freezing point, i is the van 't Hoff factor (which is 1 for a non-electrolyte like glucose), Kf is the freezing point depression constant for water (1.86°C/m), and m is the molality of the solution. Given that the freezing point of the solution is -0.325°C and the freezing point of pure water is 0.0°C, ΔTf = 0.0°C - (-0.325°C) = 0.325°C. Now, we can solve for molality (m).
ΔTf = (1) * (1.86°C/m) * m => 0.325°C = 1.86°C/m * m
Therefore, m = 0.325 °C / 1.86 °C/m = 0.175 mol/kg, which is the molal concentration of the glucose solution.
A 100. mL volume of 0.800 M calcium chloride is mixed with 400. mL of water to make 500. mL of solution. What is the final molarity of this solution ?
Final answer:
To find the final molarity of the solution, use the formula M1V1 = M2V2. Plugging in the values, we can solve for M2, which is the final molarity. In this case, the final molarity is 0.160 M.
Explanation:
To find the final molarity of the solution, we need to use the formula:
M1V1 = M2V2
Where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.
In this case, M1 is 0.800 M, V1 is 100. mL, M2 is unknown, and V2 is 500. mL. Plugging in these values, we can solve for M2:
(0.800 M)(100. mL) = M2(500. mL)
Dividing both sides by 500. mL gives:
M2 = (0.800 M)(100. mL) / 500. mL = 0.160 M
Therefore, the final molarity of the solution is 0.160 M.
Identify the type of reaction
Na2SO4 + 2AgNO3 → Ag2SO4 + 2NaNO3
A 0.120 gram sample of Zn reacts with an excess of hydrochloric acid and produces 46.5 mL of H2 gas which is collected over water at a barometric pressure of 748 mm Hg and at 23° C. The vapor pressure of water at 23° C is 21 mm Hg. What is the molar mass of Zn?
To determine the molar mass of Zn, we first calculated the moles of H2 gas using the ideal gas law with corrected gas pressure, and then used this to find the moles of Zn which was equal to the moles of H2. By dividing the mass of Zn by the moles of Zn, we found the molar mass to be 66.7 g/mol.
To calculate the molar mass of Zn, using the data provided, we first have to use the ideal gas law to find the number of moles of H2 gas produced. The barometric pressure is given as 748 mm Hg, from which we need to subtract the vapor pressure of water at 23°C (21 mm Hg) to find the actual pressure of the hydrogen gas.
The corrected gas pressure is, therefore, 748 mm Hg - 21 mm Hg = 727 mm Hg. Converting this to atmospheres (atm): 727 mm Hg * (1 atm / 760 mm Hg) = 0.957 atm. Given that the volume of the gas is 46.5 mL (which we convert to liters: 46.5 mL * (1 L / 1000 mL) = 0.0465 L) and temperature is 23°C (which we convert to Kelvin: 23 + 273 = 296 K), we can use the ideal gas law (PV = nRT) to calculate the number of moles of hydrogen gas (n).
Calculate moles of H2:
PV = nRT
n = PV / RT
n = (0.957 atm * 0.0465 L) / (0.0821 L atm mol-1 K-1 * 296 K)
n = 0.00180 moles of H2
Since one mole of Zn produces one mole of H2, the moles of Zn reacted is also 0.00180. The molar mass (M) of Zn can now be calculated by dividing the mass of the Zn by the moles of Zn consumed.
Calculate molar mass of Zn:
M = mass / moles
M = 0.120 g / 0.00180 mol
M = 66.7 g/mol
The answer is: 65.22. The molar mass of Zn is approximately 65.22 g/mol.
1. Calculate the pressure of the dry hydrogen gas by subtracting the vapor pressure of water from the total pressure. The total pressure is given as 748 mm Hg, and the vapor pressure of water at 23°C is 21 mm Hg.
Dry H₂ gas pressure = Total pressure - Vapor pressure of water
Dry H₂ gas pressure = 748 mm Hg - 21 mm Hg
Dry H₂ gas pressure = 727 mm Hg
2. Convert the pressure of the dry hydrogen gas from mm Hg to atmospheres (atm).
1 atm = 760 mm Hg
Dry H₂ gas pressure in atm = 727 mm Hg - (1 atm / 760 mm Hg)
Dry H₂ gas pressure in atm = 0.9566 atm
3. Convert the temperature from degrees Celsius to Kelvin (K).
T(K) = T(°C) + 273.15
T(K) = 23°C + 273.15
T(K) = 296.15 K
4. Use the Ideal Gas Law to calculate the number of moles of hydrogen gas produced. The Ideal Gas Law is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.
Rearrange the Ideal Gas Law to solve for n (number of moles of H₂):
n = PV / RT
We need to convert the volume of H2 gas from mL to L:
1 L = 1000 mL
V = 46.5 mL = 0.0465 L
Now, plug in the values:
n = (0.9566 atm)(0.0465 L) / (0.0821 L·atm/mol·K)(296.15 K)
n = 0.00184 mol
5. According to the balanced chemical equation for the reaction of zinc with hydrochloric acid, the reaction is:
Zn(s) + 2HCl(aq) -- ZnCl₂(aq) + H2(g)
From the stoichiometry of the reaction, 1 mole of Zn produces 1 mole of H₂ gas. Therefore, the moles of Zn reacted is equal to the moles of H₂ gas produced.
Moles of Zn = Moles of H₂
Moles of Zn = 0.00184 mol
6. Finally, calculate the molar mass of Zn using the mass of the Zn sample and the moles of Zn reacted.
Molar mass of Zn = Mass of Zn sample / Moles of Zn
Molar mass of Zn = 0.120 g / 0.00184 mol
Molar mass of Zn = 65.22 g/mol
This value is close to the accepted molar mass of Zn, which is 65.38 g/mol, indicating that the calculation is consistent with the expected value.
help, timed assignment
Answer:
B
Explanation:
ALL CELLS USE CELLULAR RESPIRATION
Study the diagram, which represents the general equation
for photosynthesis,
What do the letters Y and Z represent?
Y - glucose
Z-oxygen
Y - glucose
Z-carbon dioxide
Y - carbon dioxide
Z - hydrogen
Y - carbon dioxide
Z - oxygen
It’s glucose and oxygenAnswer:
Explanation:
Answer:
Y - glucose Z - oxygen
Explanation:
If a tree stops producing nuts in the winter, what might a chipmunk do to adapt?
Answers:
1: Find another food source
2: Lose fur
3: Build a nest
4: Change fur color
Answer:
Find another food source
Explanation:
They should Find another tree or food soure
You hold a handful of rocks and a handful of feathers. The rocks feel heavier than
the feathers, even though you hold the same amount of both. Which of the following is true?
a) The rocks have more mass, and therefore contain more matter, than the
feathers.
b) The feathers have more mass, and therefore contain more matter, than the
rocks.
c) The rocks and feathers have the same mass.
d) The rocks and feathers have the same amount of matter.
Answer:
a) The rocks have more mass, and therefore contain more matter, than the
feathers.
Explanation:
Final answer:
The correct answer is that rocks have a greater mass and contain more matter than an equal volume of feathers, making them feel heavier. This illustrates the concept of mass versus density in physics.
Explanation:
The question involves comparing the mass and density of two different materials and understanding their properties in terms of physics. When you hold the same volume of rocks and feathers, the rocks feel heavier because they have a greater mass and density than the feathers. This is similar to the old riddle about whether a ton of feathers or a ton of bricks weighs more, which serves to illustrate that while the mass — a measure of how much matter is in an object — is the same for both (a ton is a ton), the density of the bricks is much higher. Density is the mass per unit volume, and since bricks are denser than feathers, a given volume of bricks will weigh more than the same volume of feathers.
Answering the student's question directly, option a) The rocks have more mass, and therefore contain more matter, than the feathers. is the correct choice. The rocks, having more mass, will have more matter in the same volume when compared to feathers, which is why rocks feel heavier.
How many joules are required to raise the temperature of a 6.50 g sample of silver from 34°c to 189°C? The specific heat of gold is 0.235j/g°c
Answer:
236.76 J
Explanation:
Parameters given:
Mass of sample, m = 6.50 g
Initial temperature, [tex]T_1 = 34^o C[/tex]
Final temperature, [tex]T_2 = 189^oC[/tex]
Specific heat capacity of gold, [tex]c = 0.235 J/g^oC[/tex]
Heat of a substance is related to specific heat capacity by the formula:
[tex]H = mc(T_2 - T_1)[/tex]
[tex]H = 6.5 * 0.235 * (189 - 34)\\\\\\H = 6.5 * 0.235 * 155\\\\\\H = 236.76 J[/tex]
236.76 J of heat is required to raise the temperature of the sample.
The quantity of heat, in Joules, required to raise the temperature is 236.76 J
HeatFrom the question we are to determine quantity of heat required
Using the formula
Q = mcΔT
Where Q is the quantity of heat
m is the mass of substance
c is the specific heat capacity
and ΔT is the change in temperature
From the given information,
m = 6.50 g
c = 0.235 J/g °C
ΔT = 189 °C - 34 °C = 155 °C
Putting the parameters into the formula, we get
Q = 6.50 × 0.235 × 155
Q = 236.76 J
Hence, the quantity of heat, in Joules, required to raise the temperature is 236.76 J
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At what temperature (°C) will a 10.00 g sample of neon gas exert a pressure of 96.7 kPa in a
9.50 L container?
Answer : The temperature of neon gas will be, 221.0 K
Explanation :
To calculate the temperature of neon gas we are using ideal gas equation.
[tex]PV=nRT\\\\PV=\frac{w}{M}RT[/tex]
where,
P = pressure of neon gas = 96.7 kPa = 0.955 atm
Conversion used : (1 atm = 101.3 kPa)
V = volume of neon gas = 9.50 L
T = temperature of neon gas = ?
R = gas constant = 0.0821 L.atm/mole.K
w = mass of neon gas = 10.00 g
M = molar mass of neon gas = 20 g/mole
Now put all the given values in the ideal gas equation, we get:
[tex](0.955atm)\times (9.50L)=\frac{10.00g}{20g/mole}\times (0.0821L.atm/mole.K)\times T[/tex]
[tex]T=221.0K[/tex]
Therefore, the temperature of neon gas will be, 221.0 K
To find the temperature at which a 10.00 g sample of neon gas will exert a pressure of 96.7 kPa in a 9.50 L container, we can use the ideal gas law. After all the calculations, the temperature comes out to be approximately -52 °C.
Explanation:The temperature at which a 10.00 g sample of neon gas will exert a pressure of 96.7 kPa in a 9.50 L container can be calculated using the ideal gas law, which is PV = nRT. Here, P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
First, let's convert the weight of Neon into moles by using the molar mass of Neon (20.18 g/mol). So, n = 10.00 g / 20.18 g/mol = 0.495 moles. The R value that corresponds to the units of pressure (kPa) and volume (L) we're using is 8.3145 L.kPa/K.mol. Now, we can solve the equation for the temperature: T = PV/nR = (96.7 kPa * 9.50 L) / (0.495 mol * 8.3145 L.kPa/K.mol) = 221.5 K.
Since the question asks for the temperature in °C, we need to convert Kelvin to Celsius by subtracting 273.15: T = 221.5 K - 273.15 = -51.65 °C. Therefore, a 10.00 g sample of neon gas will exert a pressure of 96.7 kPa in a 9.50 L container at approximately -52 °C.
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