The noble gases, in Group VIII of the Periodic Table, are unreactive and do not bond with other elements. State one use for helium.
Answer:
refigeration,coolant for nuclear reactants
Explanation:
used for cooling properties since it's boiling point being close to absolute zero.
Convert 3828 ml to L
Answer:
divide the volume value by 1000
So 3828/1000=3.828
What would happen to the rate of the forward reaction if the concentration of nitrogen were decreased?.
Answer:
The reaction rate would decrease
Explanation:
What would happen to the rate of the forward reaction if the concentration of nitrogen were decreased? The reaction rate would decrease . What will happen to the rates of the forward and reverse reactions when a catalyst is added? Both forward and reverse rates increase.
Which two layers are approximately the same age?
Answer:
The bottommost layer in core sample 1 and the topmost layer in core sample 2.
Explanation:
Correct me if im wrong :)
Is the water cycle a scientific model. (I don't rember lol)
(Yes)
Or
(No)
why position of hydrogen is controversial in periodic table
Answer:
the position of hydrogen is controversial in periodic table because hydrogen is the only element with out neutron. it belongs to 1 st group but it is not placed there .Feb 8, 2018
Explanation:
pls give brainliest and heart much appreciated
please name these chemicals.
Answer: Carbon,Hydrogen, Chlorine
Explanation:
C=Carbon
H=Hydrogen
Cl=Chlorine
Hope this helps :)
Which of the following is not a source of light?
A. The moon
B. A glowworm
C. A star
D. Car headlight
Answer:
A. The moon
Explanation:
This is because the sun gives the moon the light the moon doesn't make it.
Which of Earth's early sources of heat are not major
contributors to Earth's present-day internal heat?
Answer:
(1) extraterrestrial impacts, (2) gravitational contraction of the Earth's interior, and (3) the radioactive decay of unstable isotopes.
Explanation:
hope this helps
(1) Extraterrestrial impacts, (2) gravitational contraction of the Earth's interior, and (3) the radioactive decay of unstable isotopes are the sources of heat that are not major contributors to Earth's present-day internal heat.
What is heat?Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.
(1) Extraterrestrial impacts, (2) gravitational contraction of the Earth's interior, and (3) the radioactive decay of unstable isotopes are the sources of heat that are not major contributors to Earth's present-day internal heat.
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How did scientists conclude that most of an atom is empty space?.
Answer:
Rutherford concluded from his metal foil experiments that most of an atom is empty space with a tiny, dense, positively charged nucleus at the center that contains most of the mass of the atom. He also concluded that the electrons orbit the nucleus like the planets orbit the sun
Explanation:
If an element's half life is 3 days and there is initially 200 grams of the substance, how much of the substance is present after 1 half life period (3 days)?
Answer:
all u have to do is multiply
how many grams is 3.845 kilograms?
Answer:
3845
Explanation:
Answer:
it is 3845 grams
Explanation:
Static charges can be applied to neutral objects by friction, induction or conduction. What do all of these methods utilize to create this charge?
Protons
Electrons
Heat Energy
Magnetic domains
Answer:
Electrons
Explanation:
"Static charges" occur when the number of positive charge and negative charge are not equal. This can be applied to neutral objects by friction, induction and conduction with the help of "electrons."
In friction, the electrons are being transferred between the objects being rubbed together.
In conduction, the electrons are also being transferred from one object to another but not through rubbing; instead through direct contact.
In induction, the electrons are able to react immediately without the need for direct contact.
So, electrons are being utilized in these processes in order to create charge.
A sample of calcium oxide (cao) has a mass of 2.80 g. the molar mass of cao is 56.08 g/mol. how many moles of cao does this sample contain? 0.0499 moles 20.0 moles 58.9 moles 157 moles
Answer:
0.0499 moles
Explanation:
56.08g => 1 mol
2.80g => y mol
Y = 2.80/56.08 = 0.0499 moles
A sample of calcium oxide (CaO) has a mass of 2.80 g. the molar mass of CaO is 56.08 g/mol. No. of moles of CaO this sample contain are 0.499.
What is mole concept?Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.
No. of moles = Mass of compound ÷ Molar mass of compound
No. of moles = 2.80 ÷ 56.08 = 0.0499
Therefore, A sample of calcium oxide (CaO) has a mass of 2.80 g. the molar mass of CaO is 56.08 g/mol. No. of moles of CaO this sample contain are 0.499.
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Which of the following is an example of a physical property
Reaction with acids
Density
Reaction with water
Flammability
Answer:
The answer of this question is density
What is the concentration of S2−
in equilibrium with MnS(s) (sp=4. 6×10−14)
and 0. 083
M Mn2+
?
The concentration of S2−in equilibrium with MnS(s) (sp=4. 6×10−14) and 0.083M Mn2+ is mathematically given as
[s^2-]=61.333*10^{-14}M
What is the concentration of S2−?Generally, the equation for the solubility constant is mathematically given as
Ksp=[Mn^2+][s^2-]
Therefore
4.6*10^{-14}=0.075*[s^2-]
[s^2-]=4500/0.075*10{-14}
[s^2-]=61.333*10^{-14}M
In conclusion, The concentration of S2−
[s^2-]=61.333*10^{-14}M
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help!
The speed of light in vacuum is 300,000,000 m/s and the speed of light in water is 225,000,000 m/s. What is the refractive index?
A. 1.33
B. 1.5
C. 1
D. 2.33
Answer:
A 1.33
Explanation:
Refractive index = (speed of light in vacuum)/(speed of light in another medium)
Refractive index = (300000000)/(225000000)
Refractive index = 1.33
CHEM HELP
3. Use the equation for Charles’s Law to calculate the following. (2pts)
A balloon is filled up to 1 liter at a temperature of 294.15K. The balloon is then placed in a freezer for 24 hours at a temperature of 273.15K.
What is the volume of the balloon when it is taken out?
Answer:
It had changed by .001 liters because of the way that cold air can't evaporate more than .5 liters of air
Explanation:
Part 1. A chemist reacted 15. 0 liters of F2 gas with NaCl in the laboratory to form Cl2 and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and 1. 50 atm.
F2 + 2NaCl → Cl2 + 2NaF
Part 2. Explain how you would determine the mass of sodium chloride that can react with the same volume of fluorine gas at STP
Answer:Part 1. A chemist reacted 15. 0 liters of F2 gas with NaCl in the laboratory to form Cl2 and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and 1. 50 atm.
Explanation:
answer f2 280
9.3 mol H2O =
molecules H2O
Answer:
5.6 x 10²⁴ molecules H₂O
Explanation:
9.3 moles * (6.02214076 x 10²³) = 5.6 x 10²⁴
The Avogadro constant = 6.02214076 x 10²³
This constant is the number of particles (such as atoms, ions, or molecules) in one mole of something.
The molecular weight of table salt, NaCl, is 58. 5 g/mol. A tablespoon of salt weighs 6. 37 grams.
Calculate the number of moles of salt in one tablespoon.
First, complete the unit conversion using dimensional analysis:
Answer:
Answer in picture
Explanation:
A mixture is prepared by mixing 29.27 mL of the blue dye solution with 35.00 mL of the red dye solution and 14.73 mL of the yellow dye solution. What is the molar concentration of the blue dye in the mixture
If a mixture is prepared by mixing 29.27 mL of the blue dye solution with 35.00 mL of the red dye solution and 14.73 mL of the yellow dye solution, the molar concentration of the blue dye in the mixture is
MB'=0.1189M
What is the molar concentration of the blue dye in the mixture?Generally, the equation for the moles is mathematically given as
Moles=Molarity *volume
Therefore
For Blue dye
MB=0.3523*25.27*1/1000ml
MB=8.90*10^{-3}
For red dye
MR=0.1017*35.27*1/1000ml
MR=3.55*10^{-3}
For yellow dye
MY=0.3523*14.73*1/1000ml
MY=2.27*10^{-3}
Where
Total volume is
T=25.27+35.ml+14.73
T=75ml
In conclusion, The molar conc of blue dye is
[tex]MB'=\frac{8.90*10^{-3}*1000}{75}[/tex]
MB'=0.1189M
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how can i discribe the properties of each state of water when cooling and heating occurs?
Answer:
When it is cold, it's hard for the molecules and whatever microscopic organisms live there to move around.
When it is hot, the molecules will move quicker due to a chemical reaction with the atoms and other forms of energy increasing with the heat energy. This reaction happens because 2 forms of energy meet.
I hope this helps!
The sentence explains the production and movement of energy in the sun and the flow of energy from the sun to earth. Draw each item to the correct location. Answers may be used more than once
(energy is released in the sun's core through_____ it then transferred by_____through the sun's radiative zone to the conductive zone,where it is transferred to the sun's surface by____ from the surface ,energy from the sun is transferred to earth by____
1. Nuclear fusion
2. Radiation
3. Conduction
Answer:
Nuclear fusion, Conduction, Conduction, Radiation.
The Sun produces energy deep inside its core by fusing hydrogen atoms together to form heavier ones through nuclear fusion. Conduction and convection are used to move heat from the core to the surface.
Radiation is the electromagnetic transmission of heat energy through space. The majority of the electromagnetic radiation that the sun emits and that reaches the Earth is invisible. Only a tiny fraction is visible light. Light consists of waves of various frequencies.
When two objects with different surface temperatures come in contact with one another, conduction happens. Up until they reach the same temperature, heat moves from the warmer to the cooler object. Heat moves through a substance by conduction when molecules collide.
Thus the correct order is Nuclear fusion, Conduction, Conduction, and Radiation.
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Ammonia molecules are composed of carbon and sulfur and is used as a fertilizer.
True
False
Answer:
Ammonia (NH3) is composed of Nitrogen and 3 Hydrogens
Explanation:
Quick help!!! Name two methods that can be used to break down compounds into simpler substances.
Answer:
Photolysis and hydrolysis. These are two methods that can be used to break down a compound into simpler substances and smaller units.
Explanation:
which particle is gained and lost during a redox process?
Answer:
electrons
Explanation:
A redox reaction is one in which oxidation and reduction takes place. in the sense of
oxidation being the loss of electrons and reduction the gain of electrons.
Which of the following is a benefit of hydroelectric dams?
It allows for control of downstream seasonal Fooding
O
The reservoir can be a tourist attraction
o
There are no air pollutants are released during electricity
generation
OAll of the above
Answer:
I'm pretty sure it all of the above
sorry if I'm wrong
Explanation:
Wave interference occurs only when a wave is reflected.
TRUE or false
Answer:
False
Explanation:
It occurs when two waves meet while traveling along the same medium.
ASAP HELP, PLEASE HELP ASAP
Which statement accurately compares kinetic and Potential energy?
Question 5 options:
Gravity affect the amount of both kinetic and potential energy
Both kinetic and potential energy are a result of an unbalanced force acting on the object
Potential energy and kinetic energy both gain energy from standing still
Kinetic and Potential energy affect an object the same
Answer: gravity affect the amount of both kinetic and potential energy
Explanation: