Moles of Hg
Given mass/Molar mass1.252/200.590.006mol2 moles produce 1 mol O2
1 mol produces 1/2mol O_2
0.006 mol produces
0.006(0.5)0.003molHELP!! I need some real world applications for different amounts of acetic acid (vinegar) mixed with sodium bicarbonate (baking soda). This is really important for my assessment so please help!!!
A mixture of acetic acid (vinegar) mixed with sodium bicarbonate (baking soda) is called carbonic acid and is very useful as a cleaning agent.
What is the use of acetic acid (vinegar) mixed with sodium bicarbonate (baking soda)?A mixture of acetic acid (vinegar) mixed with sodium bicarbonate (baking soda) is called carbonic acid and is very useful as a cleaning agent since it has a fizzling sensation.
It can be used to clean the carpet, washing machine, pressing iron, dish washer etc.
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Which of the following would be appropriate reason(s) for scientists to reject atomic theory?
evidence that John Dalton did not give credit to others who helped him develop the theory
evidence that some kinds of matter are made up of waves instead of particles
observations that cannot be explained by the theory
observations that are predicted by the theory
The appropriate reasons for scientists to reject atomic theory are :
Evidence that some kinds of matter are made up of waves instead of particles ( B )Observations that cannot be explained by the theory ( C )What is atomic theory ?
Atomic theory states that every material substance is composed of similar minute particles known as atoms which share the same properties. these particles ( atoms ) bound together to form a matter.
Matter is composed of particles ( atoms ) and not wave also certain observations that cannot be explained will lead to the discredit of the atomic theory.
Hence we can conclude that The appropriate reasons for scientists to reject atomic theory are : Evidence that some kinds of matter are made up of waves instead of particles and Observations that cannot be explained by the theory
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Under what circumstances can the general trend to disorder in the universe be reversed?
Answer:
See explanation.
Explanation:
This will never naturally occur but you can tweak the system quantum mechanically to temporarily reverse entropy.
Identify the solutions among the following mixtures
Soil, Sea water, Air, Coal, Soda water
Answer:
Out of the above mixtures, seawater, air, and soda water are solutions.
hope this helps :3
In which condition does barium chloride conduct electricity? And why
Answer:
When barium chloride (BaCl 2) is dissolved in water, the water conducts electricity. In what form will the dissolved BaCl 2 be found? a. as Ba 2+ and Cl - ions b. as Ba atoms and Cl 2 molecules
Explanation:
During a reaction, the enthalpy of formation of an intermediate is 34 kJ/mol. During the reaction, 4 moles of the intermediate are produced. What is the enthalpy value for this step of the reaction?
The enthalpy change for the formation step of this intermediate is 136 kJ/mol.
What is the enthalpy?The enthalpy of reaction can be obtained from the enthalpies of formation of the species involved. The enthalpy of reaction is the heat evolved or absorbed in a reaction.
Thus, the enthalpy change for the formation step of this intermediate is 4 * 34 kJ/mol = 136 kJ/mol.
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The diagram below shows three kettles with their powers and the time they take to boil 500cm3 of water. How much energy is transferred (in kilojoules, kJ) by the 1.4kW kettle while it boils the water?
The energy transferred is given as the product of power and time. The 1.4 kW kettle with boiled water produces 378 kJ of energy.
What is energy?Energy is the quantitative property that determines the work done by the body in the form of heat and light.
The image showing the kettles with time and power is attached below.
Given,
Power of the kettle = 1.4 kW
Time taken = 4.5 minutes
If power = energy ÷ time
Then, energy = power × time
= 1.4 × 0.075
= 0.105 KWh
Therefore, 0.105 kWh or 378KJ is the energy transferred.
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Which statement
about
gravitational force is most
accurate?
Gravitational force is the force of attraction. This kind of force forms an action-reaction in a situation.
What is gravitational force?Gravitational force is the force present that is directly proportional to the masses and inversely to the square of the distance present from the center of the masses.
It is independent of the medium and remains constant in any matter whether it is water, air, or soil. It is conservative and is a central force that obeys Newton's law of motions.
Therefore, the gravitational force follows the action and reaction.
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Identify a cation. An atom that has gained a proton. An atom that has lost an electron. An atom that has gained an electron. An atom that has lost a proton.
the answer would be B an atom that has lost an electron
How do you know which element the little number (subscript) goes with?
Answer:
you will not
Explanation:
the little subscript number just indicates how many of a certain atom is in a molecule... example H₂O... that little ₂ means that there are 2 hydrogen atoms in the water molecule.
there is an invisible ₁ on the O as well. H₂O₁ shows there is one oxygen atom in the water molecule, but we do not show the 1
Answer:
The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound. When balancing an equation, you can change the coefficients but not the subscripts.
Which description is true of 0.02 m ca(oh)2 if ca(oh)2 completely dissociates in water?
If [tex]Ca(OH)_2[/tex] completely dissociates in water, it means it is a dilute strong base.
What is a base?A base is a substance that can neutralize the acid by reacting with hydrogen ions.
An acid is a substance that donates hydrogen ions and a base is a substance that accepts hydrogen ions.
Ca(OH)₂ does not have hydrogen ions to donate, but it can accept hydrogen ions to form H₂O according to this equation:
H⁺ + OH⁻ → H₂O.
Hence, Ca(OH)₂ is a base.
A strong base is a base that dissociates completely into metallic and hydroxide ions in aqueous solutions, while a weak base dissociates partially.
Hence, Ca(OH)₂ is a strong base.
Dilute refers to a solution meaning that the substance is not pure and the concentration is low. Since the solution the Ca(OH)₂ is 0.02 M means that it is diluted.
Therefore, we have found that the description of 0.02 M Ca(OH)₂ is a dilute strong base.
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what biological molecules transport other substances, provide structural
support, cause the movement of muscles, and catalyze chemical reactions in
living organisms?
The biological molecules that transport other substances are the proteins.
What are proteins?Proteins are biological macromolecules that contains nitrogen in their molecules and are the building block of a living organism.
The proteins perform the following functions:
they transport other substances,provide structural support,cause the movement of muscles, and catalyze chemical reactions in living organisms.Learn more about protein here:
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What is the density of a sample of charcoal with a mass of 3.0g and a volume of 10 cm^3
Problems that I am stuck on! Need the answers asap
Answer:
1.b
2.b
3.a
4.a
Explanation:
use the rate laws when answering this.
How do you assume the help position to reduce heat loss in cold water?.
Crossing your arms across the chest and pulling the knees up to your chest is how the HELP position is achieved.
What is HELP position?This is referred to as heat escape lessening position and reduces heat loss in individuals when in cold water.
This position helps to protect groin, head/neck, and rib cage/armpits areas of the body.
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Explain the structure of an atom.
[tex]\huge\purple{Hi!}[/tex]
An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. This nucleus contains most of the atom's mass and is composed of protons and neutrons (except for common hydrogen which has only one proton). All atoms are roughly the same size. A convenient unit of length for measuring atomic sizes is the angstrom (Å), which is defined as 1 x 10-10 meters. The diameter of an atom is approximately 2-3 Å.
In 1897, J. J. Thomson discovered the existence of the electron, marking the beginning of modern atomic physics. The negatively charged electrons follow a random pattern within defined energy shells around the nucleus. Most properties of atoms are based on the number and arrangement of their electrons. The mass of an electron is 9.1 x 10-31 kilograms.
One of the two types of particles found in the nucleus is the proton. The existence of a positively charged particle, a proton, in the nucleus was proved by Sir Ernest Rutherford in 1919. The proton's charge is equal but opposite to the negative charge of the electron. The number of protons in the nucleus of an atom determines what kind of chemical element it is. A proton has a mass of 1.67 x 10-27 kilograms.
The neutron is the other type of particle found in the nucleus. It was discovered by a British physicist, Sir James Chadwick. The neutron carries no electrical charge and has the same mass as the proton. With a lack of electrical charge, the neutron is not repelled by the cloud of electrons or by the nucleus, making it a useful tool for probing the structure of the atom.
Even the individual protons and neutrons have internal structure, called quarks. Six types of quarks exist. These subatomic particles cannot be freed and studied in isolation. Current research continues into the structure of the atom.
Describe the method you could use to investigate the volume of hydrogen produced during the electrolysis of sodium chloride.
Answer:
Gas tests include:
hydrogen - lighted splint goes out with a squeaky pop.
Explanation:
Select the correct answer from each drop-down menu. a 126.1-gram block of granite at 92.6°c is dropped into a tub of water at 24.7°c in an isolated system. the final temperature of both the granite and the water is 51.9°c. the specific heat capacity of granite is 0.795 joules/gram degree celsius, and the specific heat capacity of water is 4.186 joules/gram degree celsius. the granite block transferred of energy, and the mass of the water is .
Taking into account the definition of calorimetry, the mass of water is 35.70 grams.
What is calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance c. ΔT is the temperature variation.Mass of water in this caseIn this case, you know:
For granite:
Mass of granite= 126.1 gInitial temperature of granite= 92.6 °CFinal temperature of granite= 51.9 ºCSpecific heat of granite = 0.795 [tex]\frac{J}{gC}[/tex]For water:
Mass of water = ?Initial temperature of water= 24.7 ºCFinal temperature of water= 51.9 ºCSpecific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
For gold: Qgranite= 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)
For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qgranite = + Qwater
- 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
Solving:
4,080.15465 J= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× 27.3 °C
4,080.15465 J= 114.2778 [tex]\frac{J}{g}[/tex]× mass of water
mass of water= (4,080.15465 J)÷ 114.2778 [tex]\frac{J}{g}[/tex]
mass of water= 35.70 grams
Finally, the mass of water is 35.70 grams.
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How do hollow bones improve the survival of birds? (1 point )
Answer:
Hollow bones allow the birds to fly. They're quite dense, and that density allows for flight! Because we humans do not have hollow bones, our bodies are much too heavy to fly on our own. If we did, we'd probably be able to fly.
Explanation:
what is the answer and why?
Answer:
D
Explanation:
There are 2 oxygens on the reactants side (OH)2 but 4 on the products side (2H2O). You cannot get 2 oxygens out of nowhere, so it is not balanced.
What is transferred between a conjugate acid-base pair.
Answer:
Protons (Hydrogen Ions) transfer between conjugate acid-base pair.
Explanation:
What is the percent yield if the quantity of reactants is sufficient to produce 0.86g of
NaCl but only 0.71g is obtained?
Taking into account definition of percent yield, the percent yield for the reaction is 82.56%.
Definition of percent yield
The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
[tex]percent yield= \frac{actual yield}{theorical yield}x100[/tex]
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Percent yield for the reaction in this case
In this case, you know:
actual yield= 0.71 gramstheorical yield= 0.86 gramsReplacing in the definition of percent yields:
[tex]percent yield= \frac{0.71 g}{0.86 g}x100[/tex]
Solving:
percent yield= 82.56%
Finally, the percent yield for the reaction is 82.56%.
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Where and how does most heat loss occur in a thermos bottle? _________
Answer:
neck
Explanation:
through the neck and opening of the thermos, where there is no vacuum.. hence heat is easily transmitted resulting into heat loss
How long does it take for dental stitches to dissolve.
1.A solution has a volume of 2500 mL. How
many liters is this?
2. Convert 50 g of calcium carbonate, CaCO3,
into moles.
3. A solution contains 0.42 moles of solute in
0.75 L. Calculate the molarity of the solution.
4. What is the molarity of a solution that contains
15.0 g of NaOH per 500.0 mL of solution?
5. A 250.0 mL solution contains 4.6 g of copper
(II) chloride, CuCl2. Find the molarity of this
solution.
6. How many moles of hydrochloric acid, HCl, are
present in 0.085 L of a 3.0 M solution?
7. A 37.5 mL solution contains 0.181 g of
potassium chromate, K2CrO4. What is the
molarity?
8. What is the molarity of a solution that contains
0.85 g of ammonium nitrate, NH4NO3, dissolved
in a solution with volume 100.0 mL?
9. Calculate the mass of lead (II) nitrate, Pb(NO3)2,
necessary to make 50.0 mL of a 0.100 M solution.
10. What volume of a 0.35 M solution of sodium
chloride could be formed with 25 g of NaCl?
Answer:
2.5litres
0.0005moles
0.56M
0.75M
0.1369M
0.255moles
0.0163M
0.10625M
3.312g
1221.14cm³
Explanations
1. 25÷1000=2.5l
2.Moles=Mass÷RFM
50÷1000÷(100)
0.0005moles
3.I litre=1000cm³
0.75litres=?
750cm³
0.42moles=750cm³
?=1000cm³
0.56M
4. Molarity=Conc. in g/l÷RFM
Conc.g/l
15g=500cm³
1000cm³
30g/l
Molarity
30÷(23+16+1)
0.75M
5.4.6g=250cm³
1000cm³
18.4g/l
Molarity
18.4÷(134.446)
0.1369M
6.3moles=1000cm³
(0.085×1000)
0.255moles
7.Conc.g/l
37.5cm³=0.181g
1000cm³
4.827g/l
Molarity=4.827÷(296)
0.0163M
groundwater is an important resource for all life on earth. as you have read, water levels in the ogallala aquifer are decreasing. one proposed
strategy mentioned in the article is to dig deeper wells. do you agree or disagree with this strategy? use evidence and scientific reasoning to
support your position
Digging of wells being able to increase aquifer is something I agree with.
What is an Aquifer?
This is a water permeable rock layer which is found in the underground layer of the earth.
Wells will ensure water seeps into these layers thereby bringing about an increase in the aquifer.
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V2 = (P1 × V1 × T2) (P2 × T1) A gas with a beginning pressure of 2 atm at a temperature of 300 K has a volume of 20 ml. What will be the new volume if the pressure increases to 4 atm and the temperature is lowered to 200 K?
6.6ml will be the new volume if the pressure increases to 4 atm and the temperature are lowered to 200 K.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given data:
[tex]V_1=20 ml[/tex]
[tex]T_1=3[/tex]
[tex]P_1=2 atm[/tex]
[tex]T_2=200 K[/tex]
[tex]P_2=4 atm[/tex]
[tex]V_2=?[/tex]
Using equation:
[tex]V_2 =[/tex] [tex]\frac{P_1 X V_1 XT_2}{P_2 X T_1}[/tex]
[tex]V_2 =[/tex][tex]\frac{2 atm X 20 ml X200 K}{4 atm X 300 K}[/tex]
[tex]V_2 = 6.6 ml[/tex]
Hence, 6.6ml will be the new volume if the pressure increases to 4 atm and the temperature are lowered to 200 K.
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What is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4oC?
[tex]\text{Given that,}\\\\\text{Pressure,}~ P = 1.99~ \text{atm}\\ \\\text{No. of moles,}~ n = 0.182~ \text{mol.}\\\\\text{Temperature,}~ T = 83.4^{\circ}~ C = 356.4~K\\\\ \text{Molar gas constant,}~ R = 0.082~ \text{L}~ \text{atm}~ \text{mol}^{-1}~ \text{K}^{-1}\\\\\text{Volume,}~ V =?\\\\\text{We know that,}~\\\\~~~~~~~PV =nRT\\\\\implies V = \dfrac{nRT}{P}\\\\\\~~~~~~~~~~=\dfrac{0.182 \times0.082 \times 356.4 }{1.99}\\\\\\~~~~~~~~~~\approx 2.68~ \text{L.}\\\\\\[/tex]
[tex]\text{Hence the volume of the gas is 2.68 L.}[/tex]
2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.
What is volume?A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected. In contrast to how much space the container actually occupies, the size of a container is typically thought of as its capacity, or the quantity of liquid it could hold.
Volume was initially measured using naturally occurring vessels of a comparable shape and then with standardised containers. Arithmetic formulas can be used to quickly calculate the volume of several straightforward three-dimensional shapes. If a formula again for shape's boundary is known, it is possible to use integral calculus to determine the volumes of more complex shapes.
P×V = n×R×T
V=n×R×T /P
=0.182 ×0.082×356.4 /1.99
=2.68L
Therefore, 2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.
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Identify the examples of experiences. Select three options.
Connie has good hearing ability.
Daryl has visited many other countries.
Alfonso has developed many strong friendships
Thelma has decided to audition for a role in a television show.
Sherry has set a goal of reading fifty books in a year.
Marion has worked at jobs that improved his time-management skills.
i need help!!!
Experience refers to something that happens in a person's life that leaves an indelible mark on the person.
What is an experience?The term experience refers to something that happens in a person's life that leaves an indelible mark on the person.
The following are experiences;
Daryl has visited many other countries.Alfonso has developed many strong friendshipsMarion has worked at jobs that improved his time-management skills.Learn more about experiences:https://brainly.com/question/11256472
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Answer:
Experience refers to something that happens in a person's life that leaves an indelible mark on the person.
What is an experience?
The term experience refers to something that happens in a person's life that leaves an indelible mark on the person.
The following are experiences;
Daryl has visited many other countries.
Alfonso has developed many strong friendships
Marion has worked at jobs that improved his time-management skills.
Explanation:
density is ______ to pressure
Answer:
When pressure increases, density increases.
When the pressure decreases, density decreases.
When density increases, pressure increases.
When density decreases, the pressure decreases.
Explanation: