Answer: Repeat the experiment several times with the same variable and constants.
Explanation: The experimental procedure should be performed many times so as to determine the effect of the stain remover on mustard stain in different conditions and while using different variables such as water and type of machine used. This will tell how useful the stain remover in all conditions provided to check the accuracy of the stain remover.
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Answer:
C
Explanation:
if his brother does the expire end it is replication if he was to do the same expirement with the same variables then the same outcome would come out
A solution is classified as a weak base. Which of these could be the pH of the solution?
A)2
B)6
C)10
D)13
A solution that is classified as a weak base will have a pH of:
C)10
This can be find out y looking at the pH value see below.
What is pH?A solution can be identified in terms of acidity, basicity,and neutrality by known the pH of the solution.
If pH is below 7 than the solution is acidic.
If pH is above 7 than the solution is basic.
If the pH is 7, then the solution is neutral.
A strong base will have a pH in between 11-14.
A weak base will have a pH between 8-10.
Thus, option C is correct.
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you have a container filled with 41 moles of neutral lithium. how much negative electric charge is contained in the electrons of all the lithium atoms in the container?
There are 7.407 x 10 25 electrons inside the container filled with 41 moles of neutral lithium.
Lithium is an element with an atomic number of 3. Since it has a neutral charge, the atomic number would be equal to subatomic particles proton and electron. Therefore, there 3 electrons in neutral lithium.
To solve for the number of electrons in a given number of moles of lithium, we are going to be using Avogadro's number to determine the number of lithium atoms present in the container.
Avogadro's number is the number of units, which could either be atoms, molecules, or particles, per mole of a substance and is equal to 6.02214076 x 10 23 units/mol.
(41 mol lithium)*(6.02214076 x 10 23 atoms/mol)*( 3 electrons/atom)
= 7.407 x 10 25 electrons
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ing Company
More mass
9 Calculate A block of wood has a mass of 120 g
and a volume of 200 cm³. What is the density of
the wood?
Answer:
Explanation:
The density is measured by: D=mV . Therefore, for the piece of wood in question the density could be calculated by: D=mV=57g125cm3=0.46gcm3 .
Determine the identity of a sample of gas at STP conditions, with a mass of 120.00 grams that occupies 67.2 L.
a) N2
b) Ar
c) He
d) Ne
explain your answer
Answer:
b) Ar
Explanation:
Given data:
Mass of sample gas = 120.00 g
Volume of gas = 67.2 L
Identity of gas = ?
Solution:
We will calculate the molar mass do identify the sample:
Number of moles of gas:
PV = nRT
1 atm×67.2 L = n×0.0821 atm.L/mol.K×273 K
67.2 atm.L = n × 22.42atm.L/mol
n = 67.2 atm.L / 22.42atm.L/mol
n = 3 mol
Molar mass of gas:
Number of moles = mass/molar mass
Molar mass = 120.00 g/3 mol
Molar mass = 40 g/mol
The given sample of a gas is Ar.
Which effect does an ocean have on the climate?
Answer:
A. ocean winds can carry moisture with them and can bring rain and fog over inland areas
Explanation:
It's "A. ocean winds can carry moisture with them and can bring rain and fog over inland areas' for K12 (OHVA to be exact)
Answer:
ocean currents regulate global climate, helping to counteract the uneven distribution of solar radiation reaching Earth's surface
You dissolve 8.65 grams of lead(II) nitrate in water, and then you add 2.50 grams of aluminum. This reaction occurs: 2Al(s) + 3Pb(NO3)2(aq) → 3Pb(s) + 2Al(NO3)3(aq). What’s the theoretical yield of solid lead? Use the ideal gas resource and the periodic table. A. 5.41 g B. 11.2 g C. 19.2 g D. 28.8 g Reset
Answer: A. 5.41
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Al=\frac{2.50g}{27g/mol}=0.0926moles[/tex]
[tex]\text{Moles of} Pb(NO_3)_2=\frac{8.65g}{331g/mol}=0.0261moles[/tex]
[tex]2Al(s)+3Pb(NO_3)_2(aq)\rightarrow 3Pb(s)+2Al(NO_3)_3(aq)[/tex]
According to stoichiometry :
3 moles of [tex]Pb(NO_3)_2[/tex] require = 2 moles of [tex]Al[/tex]
Thus 0.0261 moles of [tex]Pb(NO_3)_2[/tex] will require=[tex]\frac{2}{3}\times 0.0261=0.0174moles[/tex] of [tex]Al[/tex]
Thus [tex]Pb(NO_3)_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Al[/tex] is the excess reagent.
As 3 moles of [tex]Pb(NO_3)_2[/tex] give = 3 moles of [tex]Pb[/tex]
Thus 0.0261 moles of [tex]Pb(NO_3)_2[/tex] give =[tex]\frac{3}{3}\times 0.0261=0.0261 moles[/tex] of [tex]Pb[/tex]
Mass of [tex]Pb=moles\times {\text {Molar mass}}=0.0261moles\times 207g/mol=5.41g[/tex]
Thus 5.41 g of solid lead will be produced from the given masses of both reactants.
classify each change as physical or chemical. a balloon filled with hydrogen gas explodes upon contact with a spark. the liquid propane in a barbecue evaporates away because someone left the valve open. the liquid propane in a barbecue ignites upon contact with a spark. copper metal turns green on exposure to air and water.
Chemical: When a spark comes into touch with a hydrogen gas-filled balloon, the balloon explodes.
Because the user left the valve open, the liquid propane in a grill evaporates away, it is Physical.
Upon coming into touch with a spark, the liquid propane in a grill ignites. is Chemical
When copper metal is exposed to air and water, it turns green. it is chemical.
What is propane liquid?
Propane, also referred to as liquefied petroleum gas, or LPG, is a gas that is typically compressed and kept in liquid form. It is virtually odourless, harmless, and colourless; an identifying odour is added to make it detectable.
What is the shelf life of liquid propane?LPG has an infinite shelf life. The gas bottle itself is the only constraint. It might survive 20 years or longer if it is maintained and not allowed to corrode. Gas bottles normally need to be examined and refilled every 10 years, though you can use them for longer if it's safe to do so.learn more about liquid propane here
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a compound containing only sulfur and nitrogen is by mass; the molar mass is g/mol. what are the empirical and molecular formulas of the compound?'
The chemical compound's empirical formula is NS.
The chemical compound's molecular formula is N4S4.
What does a chemical empirical formula look like?The empirical formula of a compound that gives the proportion (ratios) of the elements in the complex but not the precise number or arrangement of atoms is known as an empirical formula. This would be the compound's element to whole number ratio with the lowest value.What sort of empirical formula would that be?The chemical structure of glucose is C6H12O6. Every mole of carbon and oxygen is accompanied by two moles of hydrogen. Glucose has the empirical formula CH2O. Ribose has the chemical formula C5H10O5, which can be simplified to the empirical formula CH2O.
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the question you are looking for is
A compound containing only sulfur and nitrogen is 69.6% S by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound?
which is a polyatomic ion
Explanation:
Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.
what elements are in a carboxyl group
Carbon bonded to both an oxygen bonded to a hydrogen.
Hope it helped you out.
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Fossil fuel is the best use of energy.
T
True
F
False
9 of 12
... I hope this helps
True
Answer:
True
Explanation:
Beacuse you use Fossil Fuels for gas and its oil as well
Question 3
Sugar is made of carbon, hydrogen, and oxygen atoms. Sugar is
Explanation:
sugar is a compound because the elements are chemically combined but it also can be dissolved, tho the sugar itself isn't a solution, only when added to water
I'll give brainliest
Answer:
the Potential Energy that is happened are all actions.
Explanation:
Potential energy is a property of a system and not of an individual body or particle; the system composed of Earth and the raised ball, for example, has more potential energy as the two are farther separated.
in other words
In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors
bigger size elements have low ionization energy and high shielding effect.why
Answer:
Ionization energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.
The ionization energy decreases as the size increases. The electrons get added to the new shell and the nuclear charge increases. But the effect of addition of new sheels overcomes the increase of nuclear charge.The valence shell moves far from the nucleus.
Thus the valence electron gets less tightly held by the nucleus and thus less energy is required to remove the valence electron.
Shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud, due to a difference in the attraction forces of the electrons on the nucleus. Thus as the size increases and the electrons move away from nucleus, the attractive forces decrease.
write a balanced symbol equation for the complete combustion of butane
The graph indicates what about the relationship between atmospheric carbon dioxide and time
A)
over time, the amount of atmospheric carbon dioxide increases
B)
over time, the amount of atmospheric carbon dioxide decreases
over time, the amount of atmospheric carbon dioxide stays the same
D)
over time, the amount of atmospheric carbon dioxide does not change
Answer:
A)
over time, the amount of atmospheric carbon dioxide increases
Explanation:
Answer: a) over time, the amount of atmospheric carbon dioxide increases
Explanation:
What is the speed of light of an orange light with a wavelength of 600nm and a frequency of 5.00x1014?
Answer:
3 × 10^8 m/s
Explanation:
The wavelength, can be calculated by using the following formula;
λ = v/f
Where;
λ = wavelength (m)
v = velocity/speed of light (m/s)
f = frequency (Hz)
According to the provided information in this question, λ = 600nm i.e. 600 × 10^-9m, f = 5.00 x 10^14 Hz
Hence, using λ = v/f
v = λ × f
v = 600 × 10^-9 × 5.00 x 10^14
v = 6 × 10^-7 × 5.00 x 10^14
v = 30 × 10^(-7 + 14)
v = 30 × 10^ (7)
v = 3 × 10^8 m/s
Write equilibrium constant (KC) for the following reactions
1. N2(g) + O2(g) ⇌ 2NO(g)
2. N2(g) + 3H2(g) ⇌ 2NH3(g)
3. 2SO2(s) + O2(g) ⇌ 3SO3(g)
4. 2Fe(S) + 4H2O(g) ⇌Fe3O4(s) +4H2(g)
The equilibrium constant(Kc) is equal to the concentration of the products over the concentration of the reactants, and each coefficient of the compound in an equilibrium state
Further explanationThe equilibrium constant or Kc is the value of the concentration product in the equilibrium state of the substance in the right segment divided by the product of the substance in the left section, each of which has a reaction coefficient raised
solid (s) and liquid (l) have no concentration, so these two phases are not involved in the equilibrium constant KC (given the value = 1).
The equilibrium constant based on concentration (Kc) in a reaction
pA + qB -----> mC + nD
[tex]\tt Kc=\dfrac{[C]^m[D]^n}{[A]^p[B]^q}[/tex]
1. N2(g) + O2(g) ⇌ 2NO(g)
[tex]\tt Kc=\dfrac{[NO]^2}{[N_2][O_2]}[/tex]
2. N2(g) + 3H2(g) ⇌ 2NH3(g)
[tex]\tt Kc=\dfrac{[NH_3]^2}{[N_2][H_2]^3}[/tex]
3. 2SO2(g) + O2(g) ⇌ 3SO3(g)
[tex]\tt Kc=\dfrac{[SO_3]^3}{[SO_2]^2[O_2]}[/tex]
4. 2Fe(S) + 4H2O(g) ⇌Fe3O4(s) +4H2(g)
[tex]\tt Kc=\dfrac{[H_2]^4}{[H_2O]^4}[/tex]
When fertilization occurs one half of the DNA comes from the __________
and one half from the
_________
Answer:
Father - Mother
Sperm - Egg and those fertilized are called a Zygote
Explanation:
Answer:
one half from the father and the other half from the mother
Explanation:
hope it helps
is a particle with a positive charge.:)
ammonium phosphate is an important ingredient in many fertilizers. it can be made by reacting phosphoric acid with ammonia . what mass of ammonium phosphate is produced by the reaction of of phosphoric acid? round your answer to significant digits.
7.5 g of ammonium phosphate is produced by the reaction of 4.9 g phosphoric acid.
What is Stoichiometry ?Stoichiometry helps us use the balanced chemical equation to measures quantitative relationships and it is to calculate the amount of products and reactants that are given in a reaction.
How to find number of moles ?To find number of moles use this expression
Number of moles = [tex]\frac{\text{Given Mass}}{\text{Molar Mass}}[/tex]
Given
Mass of H₃PO₄ = 4.9 g
Molar Mass of H₃PO₄ = 97.99 g/mol
Now,
Number of moles of H₃PO₄ = [tex]\frac{4.9\ g}{97.99\ \text{g/mol}}[/tex]
= 0.05001 mol
Now write the balanced chemical equation
H₃PO₄ + 3NH₃ → (NH₄)₃ PO₄
Molar Mass of (NH₄)₃ PO₄ = 149.1 g/mol
Mass of (NH₄)₃ PO₄ = No. of moles × Molar Mass
= 0.05001 mol × 149.1 g/mol
≈ 7.5 g
Thus from the above conclusion we can say that 7.5 g of ammonium phosphate is produced by the reaction of 4.9 g phosphoric acid.
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Question: Ammonium phosphate [(NH₄)₃ PO₄] is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid (H₃PO₄) with ammonia (NH₃). What mass of ammonium phosphate is produced by the reaction of 4.9 g phosphoric acid? Round your answer to significant digits.
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_______ is a nanomaterial that is often used with other compounds to desalinate and decontaminate water.
The electrical behavior of semiconductor devices and electronics can be engineered using a process called _______.
Answer:
Graphene is a nanomaterial that is often used with other compounds to desalinate and decontaminate water.
The electrical behavior of semiconductor devices and electronics can be engineered using a process called Doping
Explanation:
What happened to the liquid in Titan's lake?
Answer:
Explanation: Liquid from the lakes may have evaporated and seeped into the surface; scientists suspect seasonal changes — from winter to summer — also played a role in the lakes' disappearance. This infrared-color mosaic of data from the Cassini Visual and Infrared Mapping Spectrometer (VIMS) shows the north pole of Titan
john dalton's original atomic theory contained the following key ideas. which part(s) of these ideas was/were incorrect?
John Dalton's original atomic theory contained the following key ideas and the incorrect one is that elements are made of tiny indivisible particles called atoms and is denoted as option A.
What is Atom?This is defined as the smallest unit of matter which forms a chemical element and Dalton proposed that it was indivisible which was later proved wrong.
It was later discovered that atom is made up of sub atomic particles such as proton, electron and neutron. This was therefore the reason why option A was chosen as the most appropriate choice.
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The options include:
A. elements are made of tiny indivisible particles called atoms
B. Atoms are unchanged in chemical reaction
C. Atoms can join together in whole number ratios to form compounds.
D. The atoms of each element are unique
How many moles of CO2 are there in 8.91 x 1023 molecules of CO2?
(1 mole= 6.02 x 1023)
Answer:
1.48 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{8.91 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{8.91}{6.02} \\ = 1.480066...[/tex]
We have the final answer as
1.48 molesHope this helps you
A group of kids are playing a game of marbles. In the game of marbles, the kids take turns using a large marble, called the shooter, to hit smaller marbles outside of a circle, usually drawn in the dirt. How is the law of conservation of momentum demonstrated in this game?
Answer:
Explanation:
mjiio[mk'pk oikiom[,l
Answer:
The bigger marble may hold more momentum
Explanation:
How do you find the volume of a plastic army soldier?
O Use a formula such as length x width x height
Look on the bottom of the army soldier's foot
O Place on a beam balance
Place in water and see how much the water is displace
Use the formula such as length x width x height, first, look on the bottom of the army soldier's foot.
What is plastic made of?Through a polymerization or polycondensation process, plastics are created from natural resources such cellulose, coal, natural gas, salt, and crude oil. Plastics are made from organic, naturally occurring substances including cellulose, coal, natural gas, salt, and, of course, crude oil.
Is plastic a solid or a liquid?A thermoset polymer cannot be melted and reshaped once it has been created, despite the fact that all plastics undergo liquid phase during processing and solid phase upon completion. A polymer can have a variety of arrangements for its monomers.
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In the electronegativity periodic table down a place from left to right is it going to be the same as negative to positive
And also for the right side from down to up is it going to be negative at down and postive at the top?
Answer:
yes, you are correct
Explanation:
it increases upwards
(2S,3R)-2-Bromo-3-phenylbutane undergoes an E2 elimination when treated with sodium ethoxide. Draw all possible Newman projections for the bond relevant for the elimination reaction, and use those Newman projections to explain the stereochemical outcome of the reaction. Draw the final product and provide its IUPAC name.
Answer: (2S,3S)-2-Bromo-3-phenylbutane will undergo E2 reaction and form trans product of elimination due to its thermodynamic stability
Explanation:
Justin drives to school heading about 3 miles north from home and then head east for 1.5 miles. it takes him 45 minutes to get to school. what was his average speed/velocity?
If Justin drives 3 miles north and 1.5 miles to the east to get to school and takes him 45 minutes, his average speed/velocity is 6 miles/hour north east.
Speed is the amount of distance traveled by an object per unit of time. On the other hand, velocity is the amount of speed and the direction it is moving. Speed is a scalar quantity while velocity is a vector quantity.
To get the speed of Justin driving from home to his school, divide the distance he traveled by the amount it took him.
speed = (3 miles + 1.5 miles) / 45 minutes(1hr/60 minutes)
speed = 6 miles/hour
Taking note of the direction he traveled, the velocity will be:
velocity = 6 miles/hour north east
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