Practical work refers to the art of conducting experiments in order to answer certain research questions.
What is practical work?In science, practical work refers to the art of conducting experiments in order to answer certain research questions. This could occur in a laboratory under controlled conditions or in the field.
In the physical sciences, most of the practical work is conducted in the laboratory under controlled conditions. However, some experiments in the biological sciences and most experiments in the social sciences are conducted outside the laboratory.
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When doing a chin-up, a physics student lifts her 42.0-kg body a distance of 0.25 meters in 2 seconds. what is the power delivered by the student's biceps?
The power delivered by the student's biceps will be 51.45W.
What is Power?
This is defined as the amount of energy converted per unit and the SI unit is Watts.
Power = Energy/time
Force = ma = 42 kg × 9.8m/s² = 411.6N.
Energy = Force × distance
= 411.6N × 0.25m = 102.9J
Power = 102.9J/2s = 51.45W
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What is the mass of 3.35 mol Hg(103)2? (3 points)
1,700 g
1,840 g
1,960 g
2,110 g
Moles of Mercury Nitrate
200+(14+3(16))2200+(14+48)2200+2(62)200+124324g/molMass
Molar mass×moles324(3.35)1085.4gAnswer:
1,840g
Explanation:
I just took the test and got it right :)
You are an archeologist digging up an ancient village and you discover a 10lb cat. A careful
analysis reveals 5 x 10-13 lbs. of carbon-14. How old is the cat, and presumably the village?
The age of the cat and presumably the village is approximately 13657 years. .
What is Half-Life?Half-Life is the time taken for half the amount of a substance to disappear.
To determine the age of the cat fossil, the following should be noted:
The percentage of carbon in living organisms is 19.4%The mass of the cat is 10 lb.Mass of carbon in the sample = 0.194 × 10 lb = 1.94 lb
Ratio of carbon-12 to carbon-14 = 1 : 1.35 × 10^-12
Mass of carbon-14 initially present = 1.94 × 1/1.35 × 10^-12 = 2.619 × 10^-12
Ratio of present and original mass of carbon-14 = (5 × 10-13)/2.619 × 10^-12 =
The half-life of carbon-14 = 5700 years
The ratio of the mass of carbon-14 at present and initially = 0.191
Using the half-life formula, to calculate time elapsed:
[tex]t = \frac{t_{\frac{1}{2}}ln\frac{N_t}{N_o}}{-0.693}[/tex]
Substituting the values to solve for time, t, in years
[tex]t = \frac{5700 \times \: ln(0.191) }{-0.693} = 13656.8[/tex]
Time elapsed, t = 13656.8 years.
Therefore, the age of the cat and presumably the village is approximately 13657 years.
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The Caribbean islands are known for their many resources. For example, the ore of aluminium is found in Jamaica and Guyana. (i) Briefly describe the extraction of aluminium from its named ore. Include in your description ONE ionic equation.
Answer:
i don't know send on my insta I'd its_arsh_pb27
Explanation:
if 4.50 mol of ethane, c_(2)h_(6),undergo combustion according to the equation below , how many moles of oxygen are required? 2C_(2)H_(6)+7O_(2 )->4CO_(2)+6H_(2)O
15.75 moles of oxygen is required for 4.5 mole of ethane.
What is a Combustion Reaction ?The reaction in which a fuel gets oxidized by an oxidizing agent is called a Combustion Reaction , releasing a large amount of energy is called Combustion Reaction.
It is given in the question that
4.50 mole of ethane undergoes Combustion
2C₂H₆ + 7O₂ -> 4CO₂ +6H₂O
Mole fraction of ethane to oxygen is 2:7
Moles of ethane = 4.5
4.5 /x = 2/7
4.5 * 7 / 2 = x
x = 15.75 moles.
Therefore 15.75 moles of oxygen is required for 4.5 mole of ethane.
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How do silica levels differ between the North Atlantic and North Pacific oceans
Answer:
The highest biogenic silica accumulation rates in this area are observed in the South Atlantic, with values as large as 53 cm. kyr−1 during the last 18,000 yr. Further, extensive biogenic silica accumulation has been recorded in the deep-sea sediments of the Bering Sea, Sea of Okhotsk, and Subarctic North Pacific.
Explanation:
Which is the electron configuration for zinc?
O 1s²2s²2p 3s²3p64s²3d³
O 1s22s22p 3s23p64s¹3d¹0
O 1s22s22p53s23p64s²3d¹0
O 1s²2s²2p 3s23p64s²3d¹0
The electronic configuration of zinc is expressed as [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2[/tex]. Hence, option D is correct.
What is an electron configuration?Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.
The atomic number of zinc is 30 therefore The electronic configuration of zinc is expressed as [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2[/tex].
In simpler form expressed as [Ar] [tex]3d^10 4s^2[/tex]. The electronic configuration shows the distribution of the electrons of an atom or a molecule.
Hence, option D is correct.
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Part e
the population census of a city shows that its population has grown in the last decade.
this growth has surpassed the city's ability to provide sufficient water to its people. the
city is located about 10 miles from the ocean and has a dry climate. based on your
research and the list of criteria and constraints from part a, suggest a technology to use
in this city. defend your choice with a valid explanation.
Hydroelectricity is the technology whose growth has surpassed the city's ability to provide sufficient water to its people.
What is technology?Technology is the process of fusing science and the application of skills in scientific industries.
The population can use the waves even the tides of the ocean's water to create electricity which is reliable.
Of course in the beginning it will be expensive but the result will be effective and useful.
The area having a dry climate could be because of the winds that blow precipitating clouds away but they can have a stable climate by planting more trees where rain can be processed within the geographical location.
Finally, the problem of water supply can be fixed by installing water pipes to transport water to the community but in the process, water can be filtered or cleaned to prevent some diseases and social issues/calamities.
Hence, hydroelectricity is the technology whose growth has surpassed the city's ability to provide sufficient water to its people.
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HELP HELP HELP PLEASE
The diagram shows the reactants in the chemical reaction when carbon (C) is
combined with hydrogen (H) to produce methane. C + 4H - ??
During which phase are two distinct nuclei present.
Answer:
During the completion of mitosis (telophase), two new nuclei form around the separated sets of daughter chromosomes (see Figure 8.29).
Explanation:
What kind of engine does a hybrid car use?
Answer:
l think gasoline and electric
If you took 800mg of aspirin tablet at 12:00pm and another 800mg tablet at 2pm, how many milligrams of aspirin are still in your system at 3pm? Aspirin has a t 1/2 of 1 hour.
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 are the key concepts in the kinetic molecular theory (collision theory”
Answer:
The Police Officer
Explanation:
The Police Officer said : her key the best key on world
Is there another problem? Police officer Dua is right.Calculate the speed of light in an unknown substance whose index of refraction is 1.65. Would you expect the light to bend toward the normal or away from the normal when it passes from air into the substance?
(a) The speed of light in the unknown substance is determined 1.82 x 10⁸ m/s.
(b) The light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.
What is the speed of light?The speed of light passing from air into the substance is calculated as follows;
refractive index = speed of light in air / speed of light in the substance
speed of light in the substance = speed of light in air/refractive index
speed of light in the substance = (3 x 10⁸) / (1.65)
speed of light in the substance = 1.82 x 10⁸ m/s
Thus, the light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.
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What characteristics would show that this cat and kitten are related? Support your answer by explaining two inherited characteristics.
4. When 175 g of water is heated from 22.0°C, 1.57x106 J of energy are produced.
What is the final temperature of the water? (AT=Tr-Ti)
Answer: [tex]2168 ^{\circ} \text{C}[/tex]
Explanation:
For this question, we can use the formula [tex]Q=mc \triangle T[/tex], where [tex]Q[/tex] is the amount of heat absorbed, [tex]m[/tex] is the mass of the sample, [tex]c[/tex] is the specific heat constant, and [tex]\triangle T[/tex] is the change in temperature (final temperature minus initial temperature as stated in the question).
From the question, we know that [tex]m=175, Q=1.57 \times 10^{6}[/tex]. Furthermore, we know that [tex]c=4.18[/tex] (this is just a fact).
So, we get that [tex]1.57 \times 10^{6}=175(4.18)(\triangle T)[/tex], meaning [tex]\triangle T=2146[/tex].
Thus, [tex]t_{f}-22.0=2146 \longrightarrow t_{f}=\boxed{2168 ^{\circ} \text{C}}[/tex]
Why would scientists use molar volume to measure gases?
Answer:
The molar volume of a gas expresses the volume occupied by 1 mole of that respective gas under certain temperature and pressure conditions.
scientists use molar volume to measure gas because it it tells us about volume occupied by gas.
Molar volume
The molar volume of a gas tell us about volume occupied by 1 mole of that respective gas under certain temperature and pressure conditions.At STP(Standard Temperature and Pressure) condition which is equal to 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm.The molar volume of a gas is derived from the ideal gas law PV=NRTFor which process would the pictured cell be used?
Producing electricity
Splitting a compound into its elements
Purifying a metal
Coating a material with metal
Answer:
Coating a material with metal
(SInce the glasses will be coated with gold.)
One in which no heat is allowed to flow into or out of the system?
A. isobaric process
B. adiabatic process
C. isochoric process
D. isothermal process
the process of chlorination in water treatment aims at ?
Answer:
Chlorowanie wody jest procesem względnie tanim – koszt zbudowania samej instalacji do dezynfekcji, jak również koszt operacyjny wytworzenia 1 metra sześciennego uzdatnionej chlorem wody jest niższy od dezynfekcji wody za pomocą ozonu. Źródłem chloru w procesie dezynfekcji jest zazwyczaj podchloryn sodu, rzadziej dwutlenek chloru.
Explanation:
The equations are not balanced. which equation would have the same coefficients in the same order as 2co2 3h20 c2h6o 3o2? fecl3 nh4oh fe(oh)3 nh4cl ch4 o2 co2 h2o fe h2so4 fe2(so4)3 h2 pcl5 h2o hcl h3po4
[tex]2 Fe (s) + 3 H _2SO _4 (aq)[/tex] → [tex]Fe _2(SO _4) _3 (s) + 3 H _2 (g)[/tex] equation has the same coefficients in the same order as [tex]3 O_2 + C_2H_6O[/tex] → [tex]2 CO_2 + 3 H_2O[/tex]
What are coefficients in the balanced equation?The numbers placed in front of formulas to balance equations are called coefficients.
For the given equation [tex]3 O_2 + C_2H_6O[/tex] → [tex]2 CO_2 + 3 H_2O[/tex] sum of the coefficient of the reactant side is 5 and sum of the coefficient is 4.
So, according to the question [tex]2 Fe (s) + 3 H _2SO _4 (aq)[/tex] → [tex]Fe _2(SO _4) _3 (s) + 3 H _2 (g)[/tex] equation has the same coefficients in the same order as [tex]3 O_2 + C_2H_6O[/tex] → [tex]2 CO_2 + 3 H_2O[/tex]
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Answer:
It’s c
Explanation:
edge 2022
Can someone please help? This is really hard!!
Answer:
Less
Explanation:
The hydronium from the HCl is used to neutralize the bicarbonate in the baking soda. The hydronium is the acid and the bicarbonate ion is the base while the sodium and chloride ions are pH-neutral. Since theres a 1:1 mole ratio of hydronium to HCl and bicarbonate to sodium bicarbonate, it would require less HCl to neutralize a less concentration baking soda solution.
Select the correct answer from each drop-down menu.
What are the two criteria for designation as a biodiversity hotspot?
For a habitat to be declared a biodiversity hotspot, it must either
The criteria for designation as a biodiversity hotspot include species richness, endemism, and risk of extinction.
What is a biodiversity hotspot?A biodiversity hotspot is a region having high levels of biodiversity in its communities and ecosystems.
A biodiversity hotspot must have a high number of endemic vascular plants (at least 1500 species).
In conclusion, the criteria for designation as a biodiversity hotspot include species richness, endemism, and risk of extinction.
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Select the correct answer. a student puts a glass of water in the freezer. later, he notices ice forming on the surface of the water. which property of water best explains why ice forms on its surface?
What is the pH of a solution that contains 0.0003 moles of KOH in 410 mL of solution?
Answer: 10.865
Explanation:
The molarity of the solution is [tex]\frac{0.0003}{0.410}=0.0007317073 \text{ M}[/tex].
So, the pOH is [tex]-\log(0.0007317073)=3.135[/tex]
Since pH + pOH = 14, the pH is 14-3.135, which is about 10.865
192 grams of (NH 4 ) 2 CO 3 (N Molar Mass : 96g ) are dissolved to make 2150 mL of solution , what is the concentration of this solution ?
The concentration of a solution of 192 grams dissolved to make 2150 mL of solution is 0.93M. Details about concentration can be found below.
How to calculate concentration?The concentration of a solution can be calculated by dividing the number of moles of the substance by its volume.
no of moles of NH42CO3 = 192g ÷ 96g/mol = 2 mol
Concentration of solution = 2 moles ÷ 2.15L
Concentration of solution = 0.93M
Therefore, the concentration of a solution of 192 grams dissolved to make 2150 mL of solution is 0.93M.
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Mention two substance that sublines
Familiar substances that sublime readily include iodine , dry ice , menthol, and camphor. Sublimation is occasionally used in the laboratory as a method for purification of solids, for example, with caffeine.
PLS I WILL GIVE BRAINLY How do the number of violence electrons of the light metals compared to those heavier than boron
The valence electron of the light metals are all in the range of 1 to 3.
What are Valence electron ?Valence Electron is the number of electrons in the outer shell of an atom which participate in bond formation.
Number of Valence Electron in Boron is 3 and other light metals lighter than Boron have 1 , 2 of Lithium and Beryllium respectively,
The valence electron of the light metals are all in the range of 1 to 3.
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Ideal Gas Law Question How many moles of C2H4O are in a 58.953 L container at 467.81kPa and 446.11 °C?
The number of moles of gas in the container would be 4.62 moles
Ideal gas lawAccording to the ideal gas law:
PV = nRT, where P = pressure, V, volume, n = mole number, and R = constant = 8.31
In this case, V = 58.953 L, P 467.81 kPa, and T = 719.11 K
Making n the subject:
n = PV/RT = 58.953 x 467.81/8.31 x 719.11 = 4.62 moles
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