An element is a pure substance that cannot be separated into simpler substances by chemical or physical means
Answer:
It is an element.
Explanation:
chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.
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What are some applications of fission reactions? as a zero-waste energy source for generating large amounts of heat for creating stable elements from unstable ones for creating new, heavier elements as the energy source in nuclear weapons
Some applications of fission reactions are as a zero-waste energy source for generating large amounts of heat and as the energy source in nuclear weapons.
What are nuclear fission reactions?Nuclear fission reactions are reactions in which the nucleus of heavier atoms are split into two or more atoms of smaller nucleus with the release of energy and radiation.
Some of the applications of fission reactions are as a zero-waste energy source for generating large amounts of heat and as the energy source in nuclear weapons.
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When cooking in a convection oven, for best results you place your food in the center of the oven. This is because convection is energy transfer
A. by currents of moving liquid or gas
B. from a reaction system to its surroundings
C. by direct matter contact
D. by electromagnetic waves
This is because convection is energy transfer by currents of moving liquid or gas.
What is heat transfer by convection?
Heat transfer by convection is the transfer of heat from one place to another due to the movement of fluid.
When cooking in a convection oven, for best results you place your food in the center of the oven, this is because convection is energy transfer by currents of moving liquid or gas.
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This is because convection is a type of energy transfer by currents of moving liquid or gas (Option A).
What is convection?Convection is a physical natural phenomenon associated with energy transfer through a fluid.
In convection, a suitable fluid that produces what transfer can be for example air and/or water.
In conclusion, this is because convection is energy transfer by currents of moving liquid or gas (Option A).
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Water’s property of surface tension is due to _____.
A. capillary action
B. solubility
C. cohesion
D. adhesion
E. All of the above
Answer:
C. cohesion
Explanation:
The cohesive force between liquid molecules are responsible for the phenomenon known as surface tension
In an ionic bond, metals lose electrons to become _____.
Answer:
In an ionic bond, metals lose electrons to become Cations.
Explanation:
Metal atoms lose electrons to form positive ions (cations).
Most mechanical processing of food occurs in the _____.
Answer:
No digestion occurs in the esophagus. After passage through the esophagus, the bolus will enter the stomach and undergo mechanical and chemical digestion. Mechanical digestion in the stomach occurs via peristaltic contractions of the smooth muscle from the fundus towards the contracted pylorus, termed propulsion.
Explanation:
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The pressure for 1.0 mol of a gas at 0oC in 3.0 L container is calculated to be 7.5 atm using the ideal gas equation (PV = nRT). The pressure of the gas is measured and found to be 7.1 atm. Which of the following best explains the reason for the discrepancies in the two values?
The best explanation would be that the temperature of the gas has dropped before measuring the pressure.
Relationship between temperature and pressure of gasesAccording to pressure law, the pressure of a gas is directly proportional to its temperature, provided the volume of the gas remains constant.
Thus, since the initial pressure of the gas was calculated to be 7.5 atm, the temperature of the gas must have dropped in order for the measured pressure to be 7.1 atm.
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A species that has experienced a severe bottleneck event would be expected to _______. a. be better able to adapt to changing environmental pressures b. have few instances of inbreeding c. be more susceptible to disease and famine d. retain significant genetic diversity
Answer:
hi the answer is C
Explanation:
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Answer:
be more susceptible to disease and famine
Explanation:
what happens when you mix hydrogine, potassium and sodium
Answer:
-
Explanation:
As the piece of metal skitters across the surface of the water in a beaker and — particularly in the case of potassium — it appears to catch fire, it is not obvious that the explanation for both phenomena lies in the production of hydrogen gas.
According to Newton's second law of motion, a larger force acting on an object causes a greater(..................................) of that object
Answer:
acceleration
learnt this in 8th grade
acceleration
Newton's second law : F = m.a
F proportional to m and a
F > than a >
5. Why does temperature go down when you remove CO2?
Answer:
It is harmful gas which cause global warming
What is the molality of a solution in which 13.7 grams of nacl have been dissolved in 500 grams of water?
Answer: 0.5 M
Explanation:
molarity = (moles of solute)/(liters of solution)
To find liters of solution, we can convert the 500 grams of water to liters, which is 0.5 L.The formula mass of NaCl is about 58.44 g/mol, so 13.7 grams is about 13.7/58.44 = 0.234 mol.Hence, the molarity is (0.234)/(0.5) = 0.5 M (to 1 s.f.)
Identify the correct type of heat transfer for A, B, and C in the picture. Using the picture, cite evidence for your choices.
The correct type of heat transfer for A, B, and C are conduction, convection and radiation respectively.
What is heat transfer?Heat transfer is a process in which amount of heat will be transferred from one object to any other object by various means.
In type A, heat is transferred through conduction process as in this transfer takes place due to direct contact of particles.In type B, heat is transferred through the convection process as in that process transfer of heat takes place through the medium.In type C, heat transfer done by the radiation as in that transfer through empty space.Hence at A, B and C heat transfer done through conduction, convection and radiation respectively.
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Answer:
heat transfer for A, B, and C are conduction, convection and radiation respectively.
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If a magnet is put inside one coil of wire, a voltage is produced. what will happen if the magnet is put inside two coils of wire? a. there will not be a change. b. the voltage will decrease by a factor of two. c. the voltage will increase by a factor of two. d. the two coils of wire will cancel out the magnetic field. e. the voltage will be zero.
When the magnet is put inside two coils of wire, the voltage will increase by a factor of two.
What is induced emfAn induced emf occurs when a magnet is placed in magnetic field and their is relative motion of a conductor placed in the magnetic field.
The strength of the induced emf increases with increase in the number of the turns of the conductor and its relative speed in the field.
emf = NdФ/dt
where;
N is number of the loopsdФ is change in magnetic fluxdt is change in time.The above formula is the basis of Faraday's law of electromagnetic induction.
Thus, when the magnet is put inside two coils of wire, the voltage will increase by a factor of two.
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Which type of wave pushes the medium in the direction of the wave? *
A. transverse wave
B. compression wave
C. neither A nor B
D. both A and B
Answer:
Neither because it’s a longitudinal wave that is supposed to be the answer
Explanation:
,.,.,.,.,,.,.,..,,.,.,.,..,,..
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Thanks
Answer:
E. O, S, Se, Te
Look up atomic size charts, go to row 6
what's Electro magnetic radiation?
Answer:
a kind of radiation including visible light, radio waves, gamma rays, and X-rays, in which electric and magnetic fields vary simultaneously.
What is the color of bromocresol green indicator in a solution with a ph value of 2. 0.
Answer:
The answer would be "Yellow"
Explanation:
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1 Defing polymerization
Answer:
Polymerization, any process in which relatively small molecules, called monomers, combine chemically to produce a very large chain-like or network molecule, called a polymer. The monomer molecules may be all alike, or they may represent two, three, or more different compounds.
Explanation:
:^)
If you could travel to any TIME PERIOD, when would go and why.
Answer:
I Would Go Back To When There Were Cavemen Because I Would Love To See How Things Went On And How Women/Men Handled Themselves
Explanation:
Why Would I Travel To When Cavemen Were Here?
Because I Have A Fuji Film And I Would Love To Come Back To This Day And Show Everyone That Cavemen/Dinosoars ARE Real
When you insert a new slide in a presentation, where is it placed in relation to the existing slides?
When we insert a new slide in a presentation, it is placed next or below in relation to the existing slides.
Where should the new slide placed in relation to the existing slides?When we want to open a new slide we will Click on the New Slide button located on the Home tab in the Slides group. The new slide should appear below the selected slide.
So we can conclude that When we insert a new slide in a presentation, it is placed next or below in relation to the existing slides.
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WILL MARK BRAINLIST!! A chemist weighs a steel cylinder of compressed oxygen, O2, and finds that it has a mass of 1027.8 g. After some of the oxygen is used in an experiment, the cylinder has a mass of 1023.2 g. How many moles of oxygen gas are used in the experiment?
When answering this question include the following:
Explain how you found the mass of oxygen gas.
Explain how to find the molar mass of the compound.
Explain how many significant figures your answer needs to have.
The numerical answer
Answer:
0.14376 moles O₂
Explanation:
To find the amount of moles lost, (1) convert the grams O₂ before to moles (via molar mass from periodic table), then (2) convert the grams O₂ after to moles, then (3) subtract the moles O₂ after from the moles O₂ before.
Molar Mass (O₂) = 2(15.999) g/mol
Molar Mass (O₂) = 31.998 g/mol
Before Experiment:
1,027.8 grams O₂ 1 mole O₂
-------------------------- x ---------------------- = 32.121 moles O₂
31.998 grams
After Experiment:
1,023.2 grams O₂ 1 mole O₂
-------------------------- x ---------------------- = 31.977 moles O₂
31.998 grams
Moles Before - Moles After = Moles Lost
32.121 moles - 31.977 moles = 0.14376 moles O₂
The number of significant figures is determined by the significant figures of the values given. Both of the given values (1,027.8 and 1,023.2) have 5 sig figs. Therefore, the answer should also have 5 sig figs.
For each reaction below, use the drop-down menus to select which compound will form a precipitate. Note: It is possible that no precipitates form.
Na2S + Cd(NO3)2 → CdS + 2NaNO3
FeCl3 + 3KOH → 3KCl + Fe(OH)3
Na2CO3 + Ba(NO3)2 → BaCO3 + 2NaNO3
Answer:
1. Cadmium sulfide
2. Iron (III) hrydroxide
3. Barium carbonate
1. Cadmium sulfide
2. Iron (III) hydroxide
3. Barium carbonate
These three will form a precipitate in the respective reactions.
What is a precipitate?
In chemistry, a solid is formed by a change in a solution, often due to a chemical reaction or change in temperature that decreases the solubility of a solid.
[tex]Na_2S + Cd(NO_3)_2[/tex] → [tex]CdS + 2NaNO_3[/tex]
cadmium sulfide will form a precipitate.
[tex]FeCl_3 + 3KOH[/tex]→ [tex]3KCl + Fe(OH)_3[/tex]
iron (III) hydroxide will form a precipitate.
[tex]Na_2CO_3 + Ba(NO_3)_2[/tex] → [tex]BaCO_3 + 2NaNO_3[/tex]
barium carbonate will form a precipitate.
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) experimental evidence indicates that the nucleus of an atom
a) contains most of the mass of the atom
b) contains a small percentage of the mass of the atom
c) has no charge
d) has a negative charge
d) This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.
importance of mole ratio in solvey process
Answer:
Sry i accidently clicked on ''SAVE''.
U can remove it or report it...
Explanation:
A gas occupies a volume of 131.0-mL at 165.2-kPa. What volume will the gas occupy at 170.8-kPa if the temperature remains the same?
The relationship between the pressure and the volume of the gas at a constant temperature is given by Boyle's law. The volume, of the gas at 170.8 kPa is 126.70 mL.
What is Boyle's law?Boyle's law states the inverse relationship between the pressure and the volume of the gas. The formula for the law can be given by:
[tex]\rm P_{1}V_{1} = P_{2}V_{2}[/tex]
Given,
Initial pressure = 165.2 kPa
Initial volume = 131.0 mL
Final pressure = 170.8 kPa
The final volume is calculated as:
165.2 * 131.0 = 170.8 * V
V = 126.70 mL
Therefore, the final volume of the gas is 126.70 mL.
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What is the temperature, in degrees Celsius, of a substance with a temperature of 49K?
How do scientists organize dinosaur bones? By type and size. By size and location. By location and type.
Answer:
I'm pretty sure by type and size (I might be wrong).
3. Convert these volumes to liters:
a. 320 mL
b. 948 mL
c. 1834 mL
d. 3267 mL
4. Convert these volumes to milliliters:
a. 0.75 L
b. 0.28 L
c. 1.32 L
d. 2.4 L
why might it be unwise to drink water straight from a pond
Answer:
it is because of the bacteria and different things that go into waters such as ponds, rivers, lakes, seas, oceans, streams, and other body of waters and I should also add the chemicals that go into them as well
Explanation:
