Answer:
if a 40.0-gram sample of the gas occupies 11.2 liters of space at STP? A balloon is filled with 5 moles of helium gas.
Explanation:
An unknown substance has a density of 56 g/cm3. Its volume is 3.5 cm.
What is the mass of this unknown substance?
Answer:
The answer is 196 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 56 × 3.5
We have the final answer as
196 gHope this helps you
Please help click the picture
Answer
D
Explanation:
The formula is going to be Products / Reactants.
That means only B and D can be correct. The balance numbers to the equation are the powers which means that the answer is D
The source of alpha particles in a smoke detector is the
The source of alpha particles in a smoke detector is the Americium.
how much would the boiling point of water increase if 4 mol of NaCl were added to 1 kg of water (Kb=0.51 C/(mol/Kg) for water and i = 2 for NaCl
Answer:
4.08
Explanation:
An elements had three isotopes, determine the average atomic mass and
element.
1x - percent abundance = 80%, mass = 127
2x - percent abundance = 17%, mass = 126
3x - percent abundance = 3% , mass = 128
Answer:
126.86
Explanation:
Given parameters:
1x - percent abundance = 80%(0.8), mass = 127
2x - percent abundance = 17%(0.17), mass = 126
3x - percent abundance = 3%(0.03) , mass = 128
Unknown:
Average atomic mass = ?
Solution:
The average atomic mass is the average of all isotopes of element. It can be calculated using the expression below;
RAM = (mass x abundance of 1x) + (mass x abundance of 2x) + (mass x abundance of 3x)
Now insert the parameters and solve;
RAM = (127 x 0.8) + (126 x 0.17) + (128 x 0.03) = 126.86
Magnesium chloride is a salt formed from ionic bonding between one magnesium atom and two chlorine atoms. A magnesium atom has two electrons in its outer (third) shell; chlorine atoms have seven electrons in their outer shell. How many electrons would be in the outer shell of the magnesium once it becomes an ion
Answer:
Outermost shell of magnesium ion has 8 electrons.
Explanation:
Mg + Cl → MgCl2
Mg electronic configuration = [tex]1s^22s^22p^63s^2[/tex]
Cl electronic configuration = [tex]1s^22s^22p^63s^23p^5[/tex]
In the third shell there are two electrons while in Chlorine there are 7 electrons.
The ions formed will be Mg^+2 and Cl-
Since Magnesium has donated 2 electrons to form Mg^+2 ion now the its ionic electronic configuration becomes
Mg^+2 = [tex]1s^22s^22p^6[/tex] ( 2 , 8)
Therefore the outermost shell of magnesium ion has 8 electrons.
Now we know that atoms are built from even __________ particles
Answer:
protons, neutrons and electrons
Explanation: Can you pls give be branily thanks*
Answer:
smaller particles?
How does pulse change with exercise?
Answer:
Your muscles require extra oxygen when you workout, about three times as much as the resting muscles. This need implies that the heart begins to pump harder, which allows for a faster pulse. Your lungs, meanwhile, draw in more oxygen as well, hence the harder breathing.
Explanation:
when you exercise, your heart starts pumping blood faster, which eventually makes your pulse faster.
How is a joule defined?
A. It is the work done when a force of 1 newton is applied to an object for a distance of 1 meter.
B. It is the force needed to make an object with a mass of 1 kilogram accelerate by 1 kilogram per second squared.
C. It is the force needed to make an object with a mass of 1 kilogram travel 1 meter.
D. It is the work done when a force of 1 newton is applied to accelerate an object by 1 kilogram per second squared.
Answer:
A. It is the work done when a force of 1 newton is applied to an object for a distance of 1 meter
Explanation:
The work done when a force of 1 newton is applied to an object for a distance of 1 meter is called as joule. Therefore, option A is correct.
What do you mean by work done ?The term work done is defined as whenever work is done, energy is transferred.
To move an object, it must be converted into energy. The method of force can be used to transfer energy. Work done is the amount of energy transferred by a force to move an object.
Work can be calculated using the formula: Work = Force Distance. The joule (J) or Newton meter (N m) is the SI unit for work. One joule is the amount of work done when one Newton of force moves an object one meter.
Thus, The work done when a force of 1 newton is applied to an object for a distance of 1 meter is called as joule, option A is correct.
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If a gas in a closed container is pressurized from 15.0 atmospheres to 16.0
atmospheres and its original temperature was 298 degrees Kelvin, what
would the final temperature of the gas be?
Answer:
T₂ = 317.87 K
Explanation:
Given data:
Initial pressure = 15 atm
Final pressure = 16 atm
Initial temperature = 298 K
Final temperature = ?
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
15 atm / 298K = 16 atm/T₂
T₂ = 16atm × 298 K / 15 atm
T₂ = 4768 atm. K / 15 atm
T₂ = 317.87 K
Based on the wintertime La Niña weather map, what do you think Florida's temperature and precipitation would be like during a winter El Niño event?
*Hurry!!!!!!!! 55 points!!*
Answer:
Temperature decreases and precipitation increases.
Explanation:
Temperature of Florida decreases and precipitation increases during a winter El Niño event. Due to El Niño event, precipitation occurs above average in Florida during Fall-Winter-Spring season. Storminess also increases during this El Niño event which increases the threat of severe weather in Florida during El Niño winters.
Answer: when Pacific waters cool, moving the tropical thunderstorms so that the wind shear in the Atlantic wanes during hurricane season
What is the name of Se2Cl7?
Answer:
diselenium heptachloride
Explanation:
Se2Cl7
Se = selenium
Cl = chlorine
Don't forget the "-ide"
Diselenium heptachloride
A second unknown substance has a density of 80 g/cm and a mass of 570g. What is the volume?
Answer:
25 g
10 cm
3
=
2.5 g/cm
3
Explanation:
What reaction would the chemical equation 2H2O→2H2+O2 represent?
combustion of water
decomposition of water
replacement of water
formation of water
Answer:
decomposition of water
Explanation:
The reaction will represent the decomposition of water. It usually carried by an electrolytic process in the laboratory.
Water molecule is broken down into its constituent hydrogen gas and oxygen gas components. The breaking down of one compound to give other compounds is decomposition. This is not a replacement reaction. In decomposition, we often start with a single reactant and results in one or more products.Answer:
decomposition of water
Explanation:
i took the quiz and it was right
7. Which of the following properties identifies a pure substance?
A. soluble in water
B. tasteless and odorless
C. has a constant boiling temperature
D. can be changed from liquid to gas and back to liquid.
Answer:
Soluble in water
Explanation:
How does the law conservation of matter apply to machines
What is the difference between the units rem and rad?
Rem is a conventional unit, and rad is an Sl unit.
O Rem is an Sl unit, and rad is a conventional unit.
Rem is used to measure biological risk, and rad is used to measure absorbed radiation.
Rem is used to measure absorbed radiation, and rad is used to measure biological risk.
Answer:
Rem is used to measure biological risk, and rad is used to measure absorbed radiation.
Explanation:
Answer:
Rem is used to measure biological risk, and rad is used to measure absorbed radiation.
Explanation:
Here is an image to prove that this is correct. Did on Edge
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2. How many atoms of zinc are present in 0.48 mol of zinc?
(show solution)
Answer:
2.89× 10²³ atom
Explanation:
Given data:
Number of atoms of Zn = ?
Number of moles of Zn = 0.48 mol
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atom
0.48 mol × 6.022 × 10²³ atom / 1mol
2.89× 10²³ atom
Can someone help me please ?
Answer:
B
Graph 1 is An endothermic reaction and graph 2 is an exothermic reaction
5. Infer: Which group has high ionization energies but very weak electron affinities?
Why do you think this is so?
Answer:
The group that has high ionization energies but very weak electron affinities is the group 18, (VIIIa) which are the noble gases, the group of elements including; He, Ne, Ar, Kr, Xe, Rn, and Og in the column, at the far right corner of the periodic table
The electronic configuration of the noble gases show that they have the complete octet or 8 electrons (or duplet, 2 electrons, for helium) in their valence shell, therefore, they are relatively stable and seldom take part in chemical reaction which requires the transfer of electrons
Therefore, the noble gases have high ionization energies (require high amount of energies to remove an electron) and low electron affinity (they require an input of energy before an electron can attached to them)
Explanation:
The group having high ionization energies, but weak electron affinities is group 18 of noble gases.
Ionization energy can be defined as the amount of energy required for the removal of electrons. In noble gases, the elements have stable electronic configuration, they require a high amount of energy for removing an electron. Thus they have high ionization energy.
Electron affinity has been the energy required for the addition of an electron. The electron affinity for the addition of electrons has been zero as they are stable elements, and do not require the addition of an electron.
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if 10 ml of acetone (60) is diluted with water to a total solution volume of 200 ml, what is the percent by volume of acetone in the solution?
Answer:
5%
Explanation:
Given parameters:
Volume of original acetone before dilution = 10ml
Volume of diluted solution = 200ml
Unknown:
Percent volume of acetone in the solution = ?
Solution:
To find the percent volume of acetone in the diluted solution, use the expression below;
Percent volume of acetone = [tex]\frac{volume of original acetone}{diluted volume} x 100[/tex]
Insert the parameters and solve;
Percent volume of acetone = [tex]\frac{10}{200}[/tex] x 100 = 5%
Dynamite consists of nitroglycerine mixed with diatomaceous earth or cellulose. What is another
name for dynamite?
oKBT
oKOH
oTNT
oC-4
oCFC
Answer:
oTNT
Explanation:
Another name for the explosive dynamite is TNT, Trinitrotoluene.
Dynamite is an explosive that finds a wide range of application in many mining processes.
It was created by one of the Nobel brothers in the late 19th century. The explosive is made up of explosive sticks with a wick and blasting cap. They cause very strong explosion when detonated.Consider the balanced equation:
3Mg(OH)2 + 2H3PO4 Mg3(PO4)2 + 6H20
If you have 3 moles of Mg(OH)2, how many moles of water will be produced?
A
2
B
3
6
D
1
Answer:
A). 3 Mg, 2 P, 14 O, 12 H
Explanation:
Table salt (NaCl) is a compound. Every molecule of table salt has the same properties as every other molecule of table salt because they all have one sodium (Na) atom and one chlorine (Cl) atom. This is referred to as ____________.
A. atomic number
B. fixed composition
C. a formula
D. a heterogeneous mixture
Table salt (NaCl) is a compound. Every molecule of table salt has the same properties as every other molecule of table salt because they all have one sodium (Na) atom and one chlorine (Cl) atom. This is referred to as fixed composition.
Hope this helps! Please correct me if I'm wrong :)
Every molecule of table salt has the same properties as every other molecule of table salt because they all have one sodium (Na) atom and one chlorine (Cl) atom. This is referred to as " fixed composition".
What is fixed composition?A chemical compound has a predictable makeup. Every sample of a compound has almost the same composition, or even the identical proportion, by mass, of the components contained in the compound, as per Proust's reasoning.
What is a molecule?Atomic building blocks make up molecules.
Therefore, every molecule of table salt has the same properties as every other molecule of table salt because they all have one sodium (Na) atom and one chlorine (Cl) atom. This is referred to as " fixed composition".
Hence, the correct answer will be option (B)
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3. Why does a marshmallow burn over an open fire, but not in a microwave?
because there is not fire in the microwave
what is the measure of the amount of matter in a given amount of space
Answer:
volume
Explanation:
it is always measured in volume
At what temperature, would the volume of a gas
to be doubled. If pressure at the same time increases
from 700 to 800mm, the gas being at
initially
at 0°C
Explanation:
P1V1 = nRT1
P2V2 = nRT2
Divide one by the other:
P1V1/P2V2 = nRT1/nRT2
From which:
P1V1/P2V2 = T1/T2
(Or P1V1 = P2V2 under isothermal conditions)
Inverting and isolating T2 (final temp)
(P2V2/P1V1)T1 = T2 (Temp in K).
Now P1/P2 = 1
V1/V2 = 1/2
T1 = 273 K, the initial temp.
Therefore, inserting these values into above:
2 x 273 K = T2 = 546 K, or 273 C.
Thus, increasing the temperature to 273 C from 0C doubles its volume, assuming ideal gas behaviour. This result could have been inferred from the fact that the the volume vs temperature line above the boiling temperature of the gas would theoretically have passed through the origin (0 K) which means that a doubling of temperature at any temperature above the bp of the gas, doubles the volume.
From the ideal gas equation:
V = nRT/P or at constant pressure:
V = kT where the constant k = nR/P. Therefore, theoretically, at 0 K the volume is zero. Of course, in practice that would not happen since a very small percentage of the volume would be taken up by the solidified gas.
Choose all the answers that apply.
Which of the following best describes the movement of the objects in this ticker tape diagram? (Check photo added)
Object B has more velocity than object C.
Object C has more velocity than object B.
Object A is accelerating.
Object B is decelerating.
Object C has a constant velocity.
Answer:
2, 4, and 5
Explanation:
have a nice day:)
Answer:
2, 4, and 5
Explanation:
Hope this Helps!!!
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PLZ ANSWER QUICKLY! The electronegativity values of carbon, hydrogen, and nitrogen are compared in the table. Comparison of Electronegativity Element Electronegativity Carbon 2.5 Hydrogen 2.1 Nitrogen 3.0 Which of the following statements is true about the strength of the intermolecular forces in CH4 and NH3? (4 points) Select one: a. CH4 ≥ NH3 because CH4 is tetrahedral but NH3 is pyramidal. b. CH4 < NH3 because δ− on C in the CH bond is greater than δ− on N in the NH bond. c. CH4 < NH3 because the NH bond is more polar than the CH bond. d. CH4 ≥ NH3 because CH4 has H bonding but NH3 has dispersion forces.
Answer:
c. CH4 < NH3 because the NH bond is more polar than the CH bond.
Explanation:
Actually, the electronegativity difference between carbon and hydrogen is just about 0.4. This meager difference in electronegativity corresponds to a nonpolar bond between the two atoms.
However, the electronegativity difference between nitrogen and hydrogen is about 0.9. This larger electronegativity difference corresponds to the existence of a polar covalent bond between the two atoms.
Hence the N-H bond is significantly polar unlike the C-H bond. This implies that CH4 molecules are only held together by weak dispersion forces while NH3 molecules are held together by stronger dipole-dipole interactions and hydrogen bonds.
Answer:
CH4 < NH3 because the NH bond is more polar than the CH bond.
Explanation:
How many Na and Cl molucules are in this atom? Please help
Answer: Check my answers.
Explanation:
There are four classes of macromolecules (polysaccharides or carbohydrates, triglycerides or lipids, polypeptides or proteins, and nucleic acids such as DNA & RNA). Carbohydrates and lipids are made of only carbon, hydrogen, and oxygen (CHO). Proteins are made of carbon, hydrogen, oxygen, and nitrogen (CHON).