Answer:
for those whos question asked them to round to the nearest whole number the answer is 456
Explanation:
The weather balloon contains 456.3 kilograms of helium.
How are the density, volume and mass of a substance related?Suppose that a finite amount of substance is there having its properties as:
mass of substance = m kg
density of substance = d kg/m³
volume of that substance = v m³
Then, they are related as:
[tex]Density = \frac{mass}{volume}[/tex]
For the given case, we are given that:
Volume of balloon = volume of helium it contains = 2600 m³ = m
Density of helium it contains = 0.1755 kg/m³ = d
Let its mass be m, then:
Density of helium it contains = 2600 × 0.1755
= 456.3.
Hence, the weather balloon contains 456.3 kilograms of helium.
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HELP PLEASE!! 20 POINTSS
When kerosene and oxygen molecules react to form carbon dioxide and water, energy is released. Where do you think the energy comes from?
The energy comes from the breaking of bonds that is present between kerosene molecules.
How energy released from kerosene?When fuels are burned, the chemical energy that is present in kerosene molecules. This energy can be used to generate other form of energy, such as heat, light, motion, or electricity so we can conclude that the energy comes from the breaking of bonds that is present between kerosene molecules.
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What does acetic anhydride form when it reacts with water?
What does acetic anhydride form when it reacts with water?
When acetic anhydride reacts with water it forms acetic acid. In other words, The hydrolysis of acetic anhydride in presence of water forms acetic acid.*Note that:- It is an exothermic reaction.
Which of the following questions may be difficult to test scientifically?
A. What is the average flight speed of an African Swallow?
B. How was Hawaii formed?
C. Why is cheating wrong?
D. Is there evidence of water on other planets?
The question that may be difficult to test scientifically is Why is cheating wrong?
What is scientific experiment?An experiment is a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried.
The following questions can be test scientifically.
What is the average flight speed of an African Swallow?How was Hawaii formed?Is there evidence of water on other planets?Thus, the question that may be difficult to test scientifically is Why is cheating wrong?
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Chemistry students were testing compounds in an aqueous solution to see which one had the strongest electrical current. There are three beakers each with a different compound. The first beaker and the second beaker lit the light bulbs brightly. The third beaker did not light up the bulb. With the information that is provided, what is the best explanation for the first and second beaker being the strongest electrolytes?
A)The first and second beakers contain a solution that partially dissociates the ions. These ions create an electrical current. The third beaker solution completely dissociates the ions. It is a strong electrolyte.
B)The first and second beakers contain a solution that completely dissociates the ions. These ions create an electrical current. The third beaker solution does not dissociate ions. It is a nonelectrolyte.
C)The first and second beakers contain a solution that does not dissociate ions. These ions create an electrical current. The third beaker solution completely dissociates the ions. It is a strong electrolyte.
D)The first and second beakers contain a solution that completely dissociates the ions. These ions do not create an electrical current. The third beaker solution does completely dissociates the ions. It is a strong electrolyte.
Answer:
B)The first and second beakers contain a solution that completely dissociates the ions. These ions create an electrical current. The third beaker solution does not dissociate ions. It is a nonelectrolyte.
Explanation:
Electrolytes dissociate ions. They are also conductors. Since the first 2 bulbs light up strongly, we can assume that the ions completely dissociated. Since the 3rd did not light up, it is a nonelectrolyte.
Answer:
The first and second beakers contain a solution that completely dissociates the ions. These ions create an electrical current. The third beaker solution does not dissociate ions. It is a nonelectrolyte.
Explanation:
Witch is the best definition to describe a transfer of energy ?
Answer:
Energy transfer is the movement of energy from one place to another.
Explanation:
However, energy cannot be created or destroyed :)
identify the importance of water. check all that apply
Answer
a c e f
Explanation:
Ionic Bonds fill in the blanks
Answer:
In an ionic bond, metals lose valence electrons and become positively charged cations. Nonmetals gain valence electrons and become negatively charged anions.
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Draw a particulate level drawing of a solid, a liquid, and a gas
please help!
1. A gas sample has a volume of 150 mL when the pressure is 175 kPa. If the temperature and amount of gas remains constant, what volume will the gas sample occupy at a pressure of 120 kPa?
2. A 650 mL sample of gas is collected at a room temperature of 300C. What volume will the sample have at 0.00C assuming the pressure of the gas remains constant?
3. An aerosol can of hair spray is filled to a pressure of 50.0 psi at a room temperature of 25.00C. Calculate the pressure inside the can if the can is placed in boiling water.
4. A balloon has a volume of 400.0 mL at a pressure of 600.0 mm Hg. Calculate the volume the balloon would have at standard atmospheric pressure if the temperature remains constant.
5. A car tire has a pressure of 30.0 psi at a temperature of 27.00C. Calculate the extremes of pressure caused by temperatures ranging from –20.00C (-4.000F) on a cold winter day to 50.00C (1220F) while being driven on a hot summer day.
6. A gas sample has a volume of 480 mL at a temperature of 370C and a pressure of 95.5 kPa. What volume would the gas occupy at STP?
7. If you collect 1.75-L of Hydrogen gas during a lab experiment, when the room temperature is 230C and the barometric pressure is 105 kPa, how many moles of hydrogen will you have?
8. What volume of gas would you expect to get from a 1.5-mole sample at 350C and 1.12 atm?
From the gas laws, we can obtain that;
The final volume in the first question is 219 mL.
The final volume in the second question is 586 mL.The final pressure in the third question is 63 Psi.The final volume in the fourth question is 316 mL.The pressure lies between 25.3 psi and 32.3 psiThe final volume in the fifth question is 398 mL.The number of moles in the seventh question is 0.0035 moles.The volume in the eighth question is 33.8 L.What is gas law?Gas laws stipulate the relationship between volume, pressure and temperature of gases based on the ideal gas approach.
1) V1 = 150 mL
P1 = 175 kPa
V2 = ?
P2 = 120 kPa
From Boyle's law;
P1V1 =P2V2
V2 = P1V1/P2
V2 = 175 kPa × 150 mL/120 kPa
V2 = 219 mL
2) V1 = 650 mL
T1 = 30°C or 303 K
V2 = ?
T2 = 0.0°C or 273 K
V1/T1 = V2/T2
V1T2 = V2T1
V2 = V1T2/T1
V2 = 650 mL × 273 K/303 K
V2 = 586 mL
3) P1 = 50.0 psi
T1 = 25.0°C or 298 K
P2 = ?
T2 = 100°C OR 373 K
P1/T1 = P2/T2
P1T2 = P2T1
P2 = P1T2/T1
P2 = 50.0 psi × 373 K/298 K
P2 = 63 Psi
4) V1 = 400.0 mL
V2 = ?
P1 = 600.0 mm Hg
P2 = SP = 760 mmHg
P1V1 = P2V2
V2 = P1V1/P2
V2 = 600.0 mm Hg × 400.0 mL/760 mmHg
V2 = 316 mL
5) For the lower range;
P2 = P1T2/T1
P2 = 30.0 psi × 253 K/300 K
P2 = 25.3 psi
For the higher range;
P2 = P1T2/T1
P2 = 30.0 psi × 323 K/300 K
P2 = 32.3 psi
The pressure lies between 25.3 psi and 32.3 psi
6) P1V1/T1 = P2V2/T2
P1V1T2 = P2V2T1
V2 = P1V1T2/P2T1
V2 = 480 mL × 95.5 kPa × 273 K / 101.325 kPa × 310 K
V2 = 398 mL
7) PV = nRT
n = PV/RT
P = 105 kPa or 0.049 atm
V = 1.75-L
R = 0.082 atm L K-1mol1-1
T = 23°C or 296 K
n = 0.049 atm × 1.75-L/0.082 atm L K-1mol1-1 × 296 K
n = 0.0035 moles
8) PV = nRT
V = nRT/P
V = 1.5-mole × 0.082 atm L K-1mol1-1 × 308 K/ 1.12 atm
V = 33.8 L
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A volcano erupts and lava flows for 10 miles before slowly cooling into solid rock. Is this
change endothermic or exothermic? *
Endothermic because cold energy enters as the lava cools then forms a solid.
Exothermic because heat energy exits as the lava cools then forms a solid.
Endothermic because heat energy enters as the lava cools then forms a solid.
Exothermic because cold energy exits as the lava cools then forms a solid
Answer:
My Answer:
Explanation:
Exothermic because heat energy exits as the lava cools then forms a solid.
Which of these best describes frequency?
the number of vibrations per unit time
the loudness of a sound
the energy that bounces off an object
the bending of light as it passes through substances
==============================
[tex] \large \sf \underline{Question:}[/tex]
Which of these best describes frequency?
A. The number of vibrations per unit timeB. The loudness of a soundC. The energy that bounces off an objectD. The bending of light as it passes through substances==============================
[tex] \large \sf \underline{Answer:}[/tex]
[tex] \qquad \qquad \huge \bold{Option \: A}[/tex]
==============================
[tex] \large \sf \underline{Explanation:}[/tex]
The number of vibrations per unit time is called frequency.Additional Information: The other given choices best describes; Phon, Reflection, and Refraction.
==============================
What best describes the relationship between the frequency of an oscillation and the period of the oscillation?
brainly.com/question/13112321What best describes frequency?
brainly.com/question/4027382==============================
which of the changes gas to solid gas to liquid, liquid to solid liquid to gas,solid to liquid solid to gas will involve an output and input of heat energy
Hurrryyyy
Answer:
Liquid to solid liquid to gas
Explanation:
Boiling a liquid result in a gas
What is the equilibrium concentration
of C at 30°C for the gaseous reaction
A + B <-> 2C
if Kc = 4.0 and [Al]i = [B]i = 2.0 M ?
[?]M
Answer:
56
Explanation:
[tex]\\ \rm\Rrightarrow K_c=\dfrac{[Products]}{[Reactants]}[/tex]
Now
[tex]\\ \rm\Rrightarrow k_c=\dfrac{[C]^2}{[A]^1[B]^1}[/tex]
Put values
[C] be x[tex]\\ \rm\Rrightarrow 4=\dfrac{x^2}{2^2}[/tex]
[tex]\\ \rm\Rrightarrow x^2=4(4)[/tex]
[tex]\\ \rm\Rrightarrow x^2=4^2[/tex]
[tex]\\ \rm\Rrightarrow x=4.0M[/tex]
What happens when a fatty acid is reacted with naoh.
Explain the connection between atoms and electricity
Answer:
The protons and electrons of an atom are attracted to each other. They both carry an electrical charge. Protons have a positive charge (+) and electrons have a negative charge (-). The positive charge of the protons is equal to the negative charge of the electrons.
Explanation:
HURRY PLSS
What happens to the energy added during a phase change?
O A. It is used for the phase change.
B. It decreases the temperature.
C. It is converted to kinetic energy.
bai
D. It increases the temperature.
Answer:
A. It is used for the phase change.
What are the Kelvin and Celsius temperature scales based on?.
Answer:
The Celsius scale sets the freezing point and boiling point of water at 0°C and 100°C respectively. The Kelvin scale is based on molecular motion, with the temperature of 0 K, also known as absolute zero, being the point where all molecular motion ceases.
Explanation:
ASAP...What cause-and-effect relationships are being suggested or predicted based on smaller-scale mechanisms in the systems described by the claims?
Answer:
Cause and effect relationships are routinely identified, tested, and used to explain change.
Explanation:
____ is harmful for crop soil in building
Answer:
Acid Rain
Explanation:
Because it was even the main reason for discoloration of Taj mahal over years.
Hope it was helpful !
How many moles of FeS2 are required to produce 32 g of So2
Answer:
So, the right answer is. No. of moles of FeS₂ = 0.25 mole. Explanation: From the balanced. 4 FeS2 + 11 O2 → 2 Fe2O3 + 8 SO2.
Explanation:
help me┐(´ー｀)┌thank you in advance
Answer:
the law of conservation of mass is valid for all the following, except nuclear reactions.
Explanation:
the law of conservation of mass is valid for all the following, except nuclear reactions because some mass gets converted to energy.
Answer:
Nuclear reactions
Explanation:
What's this law?
This law states that in any chemical reaction the mass is neither created nor destroyed ,it remains conservedHow many moles of water can be produced if 8 moles h2 are used.
Answer:
10 moles for every 1 mile of oxygen
Explanation:
help me please(｡+‿+｡)
4. Change in temperature (｡^‿^｡)
What are the ways that citizens can follow in order to save water? i need 5 point min please
Answer:
the ways that citizens can follow in order to save water are:
-If you wash dishes by hand, don't leave the water running for rinsing
-Check faucets and pipes for leaks
-Don't let the faucet run while you clean vegetables
-Use your automatic dishwasher for full loads only
-Take shorter showers
-Only run the washing machine and dishwasher when you have a full load.
ASAP 20 POINTS!!!
You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2?
A) 15.5%
B) 209.2%
C) 15.8%
D) 6435%
Answer: the answer is D
Explanation: u have to divide
what is ( H+) and (OH-) in a healthy person's blood that has a PH of 7.50 assume that the temperature of the blood is 298 K.
pH = - log [H⁺]
pH = 7.5
[tex]\tt [H^+]=10^{-7.5}=3.16\times 10^{-8}[/tex]
pH + pOH = 14
7.5 + pOH = 14
pOH = 6.5
[tex]\tt [OH^-]=10^{-6.5}=3.16\times 10^{-7}[/tex]
36.0 g of Be contains how many moles? 1 mole = Molar mass (grams)
Answer:
this is the result
Explanation:
36.0
BE=4
36.0÷4
= 9
what are some orgenells in a plant
Answer:
Chloroplasts and mitochondria. Both organelles contain double membranes including characteristic internal membranes, called thylakoids in chloroplasts and cristae in mitochondria.
Answer: (1) nucleolus (2) nucleus (3) ribosome (4) vesicle (5) rough endoplasmic reticulum (6) Golgi apparatus (7) cytoskeleton (8) smooth endoplasmic reticulum (9) mitochondria (10) vacuole (11) cytosol (12) lysosome (13)
Explanation: hi
How much potassium iodide to take for radiation protection.
Age GroupKI DosageNumber of 65-mg tabletsAdults over 18 years130 mg2Over 12 - 18 years and over 150 pounds130 mg2Over 12 - 18 years and less than 150 pounds65 mg1Over 3 -12 years65 mg1
Explanation:
