Answer and Explanation:
Computers ( The computers are very old and very slow, and we have to notice that almost everyone are using computers at the same time at the school, which makes it even harder for it to load up assignments. )The Rick Rolling ( Everyone keeps sending links to teachers and students saying that it is part of some assignment but then you have to listen to Rick Astley, they should really block these links. )The lockers ( The lockers are also very old and they are breaking down and rusting a lot from the moisture in the hallways. One of the lockers even broke down today!!! I hope they can fix this so no one else gets hit with a locker door. )Hope this helps! ;)
what does 'potable water' mean?
Answer:
Potable water, also known as drinking water, comes from surface and ground sources and is treated to levels that that meet state and federal standards for consumption.
Problem 3
How many grams are in 0.8 moles of H202
Answer:
27,21 g
Explanation:
molair mass of H2O2 = 34,0147 g/mol
0,8 mol x 34,0147 g/mol = 27,21 g
Graphite has a specific heat of 0.709 J/gºC. If a 25 gram piece of graphite is cooled
by 17°C, how much energy was lost by the graphite?
Answer:
[tex]\boxed {\boxed {\sf 301.325 \ Joules }}[/tex]
Explanation:
Since we are given the mass, specific heat, and change in temperature, we should use this formula for energy:
[tex]q=mc \Delta T[/tex]
The mass of the graphite is 25 grams. Graphite's specific heat is 0.709 J/g °C. The change in temperature is 17 degrees Celsius.
[tex]m= 25 \ g \\c= 0.709 \ J/g \ \textdegree C \\\Delta T= 17 \ \textdegree C[/tex]
Substitute the values into the formula.
[tex]q= (25 \ g)( 0.709 \ J/g \ \textdegree C )( 17 \ \textdegree C)[/tex]
Multiply the first two numbers. The grams will cancel.
[tex]q= 17.725 \ J/ \textdegree C(17 \ \textdegree C)[/tex]
Multiply again. This time the degrees Celsius cancel.
[tex]q= 301.325 \ J[/tex]
The graphite loses 301.325 Joules of energy.
Convert 3.01 x 1023 atoms CU to moles
The number of moles = 0.5
Further explanationGiven
3.01 x 10²³ atoms Cu
Required
moles
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Input the value :
n = N : No
n = 3.01 x 10²³ : 6.02.10²³
n = 0.5
When chlorine is added to sodium bromide solution, the mixture turns brown. What type of reaction has taken place?
Answer:
A displacement reaction
Explanation:
This is because the chlorine reacts with the sodium bromide, forcing it to go brown.
I hope this helps, good luck! (✿◡‿◡)
When chlorine is added to a solution of sodium bromide (either as a gas or dissolved in water), the bromine is replaced by the chlorine.
What do you mean by Solution?In chemistry, a solution is a homogeneous mixture of two or more compounds in their relative proportions that can be continually altered up to what is referred to as the limit of solubility.
Although the word "solution" is typically used to refer to the liquid state of matter, solutions of gases and solids are also possible.
When chlorine is added to a solution of sodium bromide (either as a gas or dissolved in water), the bromine is replaced by the chlorine. Because chlorine is more reactive than bromine, sodium bromide loses its bromine content. The mixture darkens to brown. The bromine has been displace, giving this colour of brown.
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1. Solid fossil fuel formed from _____________ remains. Produces energy when _____________.
PLEASE HELP
which of the following has the smallest ionic radii?
1. K
2.Na
3.Ca
4.Mg
Answer:
sodium, Na
Explanation:
Na, is the smallest with atomic number 11 and it has one valence electron
Which of the following are behaviors of a gas that can be explained by the kinetic-molecular theory?
a. Gases are compressible.
b. Gases exert pressure.
c. All particles of a gas sample move at the same speed.
d. Gas particles can exchange kinetic energy when they collide.
e. Gas particles move in a curved-line path.
Answer:
b,c,d
Explanation:
gasses exert pressure, all particles of a gas sample move at the same speed. gas particles can exchange kinetic energy when they collide.
What is the name of the element with the chemical symbol B?
Answer:
boron
Explanation:
cuz science.......
Microgravity is a condition where an object or person can appear to be weightless. true or false
Answer:
its true
Explanation:
Cause i know because i just have notes a lot and i am in 10th grade U w U
What are the states of matter and why are they relevant to you?
True or False? When a gas condenses to a liquid it absorbs heat from its
surroundings.
1.True
2.False
Answer:
True
Explanation:
because it never stops doing it
The total pressure of a mixture of hydrogen, oxygen, and methane is 96.4 kPa. The partial pressures of hydrogen and oxygen are 13.5
kPa and 29.3 kPa respectively. What is the partial pressure of methane?
A. 139.2 kPa
B. 53.6 kPa
C. 82.9 kPa
D. 42.8 kPa
Answer:
53.7kPa
Explanation:
Given parameters:
Total pressure of the mixture = 96.4kPa
partial pressure of hydrogen = 13.4kPa
partial pressure of oxygen = 29.3kPa
Unknown:
partial pressure of methane = ?
Solution:
The total pressure of mixture is equal to the sum of their particles pressures;
Partial pressure of methane = 96.4kPa - (13.4kPa + 29.3kPa)
Partial pressure of methane = 53.7kPa
Answer: 53.6
Explanation: I just took the test and got it right.
3. How many moles of glucose does 1.2 x 1024 molecules represent?
It measure the number of elementary entities of a given substance that are present in a given sample. 1.99 moles of glucose are present in 1.2 x 10²⁴ molecules.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. The stoichiometry represents the number of moles. Mole is directly proportional to the number of given molecules.
Given number of atoms= 3.01x10²³atoms
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
mole of glucose =given number of molecules of glucose ÷ 6.022×10²³(Avogadro number)
Substituting the values, we get
mole of glucose= 1.2 x 10²⁴÷6.02 x 10²³
mole of glucose= 1.99 moles
Therefore, 1.99 moles of glucose are present in 1.2 x 10²⁴ molecules.
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lons form when atoms gain or lose valence electrons. When an atom gains
electrons, it becomes negatively charged, and when an atom loses
electrons it becomes positively charged. Why?
Answer:
In neutral atom number of electrons (negativity charged particle) and number of proton ( positively charged particle) are equal.
When one or more electrons are lost so positive charge particle increases and cation is formed.
For example in Na 11 electrons and 11 protons are present when it loses one electrons protons are 11 and 10 electron are remaining so one positive charge is present.
Morever when an element gain electrons one negative charge increases and anion is formed. For example in Cl 17 proton and 17 electrons are present when it gain one electron 18 electrons and 17 protons are now present one negative is more so anion negative ion is formed.
Explanation:
kind of protists can live in groups with different individuals performing different jobs (site 1)
Answer:
The plasmodial slime molds are the kind of protist that can live in groups in which different individuals perform different jobs. Some kinds of bacterial cell walls also have other functions.
how would u confirm that a colourless liquid given to u is a pure water?
have a great day
XD
Answer:
The boiling point and freezing point of the given liquid comes out to be 100°C or 373 K and 0°C or 273 K respectively under one atmospheric pressure, it confirms that the given liquid is pure water.
Explanation:
[tex]\huge{\mathfrak{\purple{Answer}}}[/tex]
The boiling point and freezing point of the given liquid comes out to be 100°C or 373 K and 0°C or 273 K respectively under one atmospheric pressure, it confirms that the given liquid is pure water
[tex]\huge{\mathfrak{\purple{Explanation}}}[/tex]
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Why is air considered a solution?
Answer:Air is a solution made up of many gases. ... There is more nitrogen than any other gas in air, so it is considered the solvent in an air solution.
Explanation:
What is the total magnification if we using objective lens 4x and our eyepiece (ocular) lens is 10x
40x
100x
400x
1000x
HELP ASAP PLSSS 3 AND 4
Answer:
both parents traits and genes
What happens to the average kinetic energy at a constant temperature? *
1.it increases
2.it decreases
3.it stays the same
4.it disappears
The amplitude of a wave is it's _________ or energy
How many grams are in 1.30 x 10^24 formula units of Ca(NO3)2?
A. 151 g
B. 354 g
C. 294 g
D. 416 g
Answer:
354 gram
Explanation:
No of formula units = no of moles × Avogadro's number
Number of moles = no of formula units/ Avogadro's number
No of moles = 1.30×10^24/60.02×10^23
No of moles = 2.159 moles
Mo of moles = mass in gram/ molar mass
Mass in gram = no of moles× molar mass
Mass in gram =2.159×164
Mass in gram = 354.15 gram
The grams that are present in [tex]1.30 * 10^{24}[/tex] formula units of [tex]Ca(NO_3)_2[/tex] is 354 gram that can be calculated using number of moles.
(B) 354 g
One mole:A mole is defined as [tex]6.02214076 * 10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others.
No. of formula units = no of moles × Avogadro's number
Number of moles = no of formula units/ Avogadro's number
No. of moles = [tex]1.30*10^{24}/6.022*10^{23}[/tex]
No. of moles = 2.159 moles
The Number of moles is defined as the given mass over molar mass.
No. of moles = Mass / Molar mass
Mass = no. of moles× molar mass
Mass =2.159×164
Mass = 354.15 gram
Thus, option B is correct.
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A dog runs 100 meters at a speed of 5 m/s. What is his time
Answer:
20 m/s
Explanation:
have a nice day¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡
In the equation CH4 + 2O2 --> 2H2O + CO2 What is the mass of CO2 produced when 35g of O2 reacts?
Answer:
24.06 g of CO₂
Explanation:
The balanced equation for the reaction is given below:
CH₄ + 2O₂ —> 2H₂O + CO₂
Next, we shall determine the mass of O₂ that reacted and the mass of CO₂ produced from the balanced equation. This can be obtained as follow:
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mass of O₂ from the balanced equation = 2 × 32 = 64 g
Molar mass of CO₂ = 12 + (2×16)
= 12 + 32
= 44 g/mol
Mass of CO₂ from the balanced equation = 1 × 44 = 44 g
SUMMARY:
From the balanced equation above,
64 g of O₂ reacted to produce 44 g of CO₂.
Finally, we shall determine the mass of CO₂ produced by the reaction of 35 g of O₂. This can be obtained as follow:
From the balanced equation above,
64 g of O₂ reacted to produce 44 g of CO₂.
Therefore, 35 g of O₂ will react to produce = (35 × 44)/64 = 24.06 g of CO₂.
Thus, 24.06 g of CO₂ were produced from the reaction.
2) If you
move 50 meters in 10 seconds, what is your velocity?
Answer:
5 meter/second.
Explanation:
You dived the seconds, 10, by the meters, 50.
Select the set of coefficients that would balance the following equation:
S + HNO3 →
H2SO4 + NO2 + H2O
O 3, 2, 2, 3,1
O 6, 2, 2, 6, 2
O 1.6, 1, 2,6
O 1,6, 1, 6,2
PLEASE ANSWER ASAP (WILL GIVE BRAINLIEST)
What do we call the invisible force exerted by magnets?
A. Magnetic force
B. Electromagnetic force
C. Electric force
D. Applied force
Answer:
Magnetic Forceeeeeeeeeee
Give examples of kinetic energy and how they work.
Answer: The kinetic energy of an object depends on both its mass and velocity, with its velocity playing a much greater role. Examples of Kinetic Energy: ... A baseball thrown by a pitcher, although having a small mass, can have a large amount of kinetic energy due to its fast velocity.
Explanation:
Hope this help
What are some of the properties of snow
Explanation:
density, albedo, light e-folding depth, specific surface area (SSA), crystal size and shape, thermal conductivity, permeability, diffusivity,