Scientific experimentation to provide the basis for scientific knowledge
A scientific experiment is any process in which measurements are used and tests are carried out to verify or refute a hypothesis and the hypothesis is a proposition that appears to be true, but has not yet been corroborated, and from which an investigation can be developed and experiment plays many roles in science and one of its important roles is to test theories and to provide the basis for scientific knowledge and it can also call for a new theory, either by showing that an accepted theory is incorrect, or by exhibiting a new phenomenon that is in need
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Convert: 28.3 micrograms to pounds.
28.3 micrograms equal to 6.2390820e⁻⁸ pounds.
A microgram is a unit of mass. 1 microgram is equal to one-millionth of a gram.
1 mcg = 0 lb
The pound is used in the imperial system for mass measurement.
1lb = 453592370 mcg
The SI or base unit for mass is the kilogram.
1 kg is equal to 1000000000 micrograms, or 2.2046226218488 pounds.
The conversion formula from micrograms to pound is:-
Pound (lb) = micrograms (mcg) ÷ 453592370
We have to convert 28.3 micrograms to pounds.
Dividing 28.3 with 453592370, we get
28.3 ÷ 453592370 = 6.2390820e⁻⁸ pounds
Therefore, 28.3 micrograms equal 6.2390820e⁻⁸ pounds.
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which information did milikan contribute to the understanding of electrons
Answer:
He figured out the amount of charge on an electron
Explanation:
Answer:
the accurate determination of the charge carried by an electron, using the e “falling-drop method”; he also proved that this quantity was a constant for all electrons, thus demonstrating the atomic structure of electricity.
Explanation:
A student made a sketch of a potential energy diagram to represent an exothermic reaction.
Explain, using complete sentences, why the diagram made by the student is correct or incorrect. Be sure to also explain what the values of X and Y represent. (10 points)
The profile shown is not for an exothermic reaction because the energy of the products is greater than that of the reactants.
What is an exothermic reaction?The term exothermic reaction refers to a type of reaction in which energy is given out during the reaction. In this type of reaction, the energy of the reactants is greater than the energy of the products. This is which it is possible for the excess energy to be given out in the reaction.
The potential energy diagram is used to show the profile of a reaction. We could look at the diagram and deduce the energy of the reactants and the products as well as the enthalpy change of the reaction which is the difference between the enthalpies of the reactants and the products.
If we have a good look at the potential energy diagram as we have in that image, the energy of the products is greater than that of the reactants hence the enthalpy change of the reaction is positive. Thus this is an endothermic reaction profile as shown.
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how can you demonstrate that iodine can melt to form a liquid at atmospheric pressure
By monitoring the temperature at just above the iodine melting point and observing the melt, it is possible to get liquid iodine at atmospheric pressure.
What happens to iodine when it melts?Iodine is a chemical element that has the symbol I and atomic number 53. If the temperature is 113.7 oC or higher, liquid iodine will be present at the bottom, though, as Mike points out, it may be challenging to see it through the intensely colored iodine vapour. The heaviest of the stable halogens, it is a semi-lustrous, non-metallic solid under normal conditions. It melts at 114 °C (237 °F) to form a deep violet liquid and boils at 184 °C (363 °F) to form a violet gas.
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You should run an experiment several times to make sure your results are consistent. In the preceding phrase, what does "consistent" mean?
Answer:
consistent
Explanation:
in this phrase, consistent means that your results do not falter and prove that your answer is performed correctly and efficiently. if an experiments results are repeated and you get a different outcome, you should restart your process and evaluate what mightve hone wrong.
Can someone explain me how to solution this question.
There will be phase changes due to which bottle will break at the end.
Many substances have the ability to alter their phase without changing their chemical makeup. The example of water is familiar. The density of the substance is altered during a phase transition. The density unit of grams per cubic centimetre is an illustration. The solid phase will typically be denser than the liquid phase. The material sample will therefore take up less space in the solid phase than it does in the liquid phase.The water now freezes, causing a phase change that results in the formation of solid water (ice). Solid water has a different density than liquid water. The fact that solid water has a lower density than liquid water is a crucial characteristic.We will use this information to calculate the volume of solid water.
mass of water inside the bottle = 242g
Volume of solid water = 242 × mL/ 0.916 g
= 265 mL
This calculated volume of solid water (ice) is greater than the glass bottle's 250 mL capacity. Therefore, bottle will crack.
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Which of the following is NOT a way in which the US began preparing for war before officially joining?
A. Positioning the economy for war
B. Civilian bombing drills at home
C. Enlarging the military
Answer:
B. Civilian bombing drills at home
Explanation:
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A student states that natural resources could be saved if people made everything they need in labs. What is the main problem with this idea?(1 point)
The materials made in labs will still pollute the environment and destroy natural resources.
Anything made in the lab requires natural resources to produce it.
There are not enough synthetic resources yet to make what people need.
People might think it is fine to waste a lot of the materials since they just came from a lab.
Anything made in the lab requires natural resources to produce it is the main problem with this idea.
The correct option is B.
What are some examples and resources?Anything that helps you live better and is practical is a resource. A "Resource" is any part of the natural world that is beneficial to humans, including things like oxygen, water, foods, plants, creatures, minerals, and metals.
What are the top ten natural resources?Stone, sand, metals, oil, coal, and natural gas are examples of natural resources. Other natural resources include things like air, sunlight, soil, and water. Natural resources include things like plants, fish, birds, and animals. The production of food, energy, and raw materials for the manufacture of commodities all depends on natural resources.
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The complete question is -
A student states that natural resources could be saved if people made everything they need in labs. What is the main problem with this idea?(1 point)
a-The materials made in labs will still pollute the environment and destroy natural resources.
b-Anything made in the lab requires natural resources to produce it.
c-There are not enough synthetic resources yet to make what people need.
d-People might think it is fine to waste a lot of the materials since they just came from a lab.
A sample is found to contain 6.96×1011 g of salt. Express this quantity in kilograms.
kg
The sample of salt found to contain 6.96 × 10¹¹ grams is equivalent to 6.96 × 10⁸ kilograms.
How to convert grams to kilograms?Kilograms is the International System of Units (S.I unit) or base unit of mass while grams is a unit of mass equal to one-thousandth of a kilogram.
Grams as a unit of mass can be converted to kilograms as follows:
1 kilograms = 1000 grams
According to this question, a sample is found to contain 6.96 × 10¹¹ grams of salt. This unit can be converted to kilograms as follows:
6.96 × 10¹¹ ÷ 1 × 10³
= 6.96 × 10⁸ kilograms
Therefore, the sample of salt found to contain 6.96 × 10¹¹ grams is equivalent to 6.96 × 10⁸ kilograms.
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What is the frequency of a photon of yellow light with a wavelength of 4.63 X 10-7m?
The frequency of a photon of yellow light with a wavelength of 4.63 X 10-⁷m is 6.48 × 10¹⁴ Hz.
How to calculate frequency?The frequency of a wave can be calculated by using the following formula:
v = fλ
Where;
v = velocity (m/s)f = frequency (Hz)λ = wavelength (m)According to this question, a photon of yellow light with a wavelength of 4.63 X 10-⁷m is given. The frequency of this photon can be calculated as follows:
f = 3 × 10⁸m/s ÷ 4.63 X 10-⁷m
f = 6.48 × 10¹⁴ Hz
Therefore, the frequency of a photon of yellow light with a wavelength of 4.63 X 10-⁷m is 6.48 × 10¹⁴ Hz.
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Which property could be used to separate a mixture of salt and water?
A. boiling point
B. mass
C. electrical conductivity
D. magnetism
Answer:
boiling points
Salt water: Salt can be separated from the water by boiling, taking advantage of the different boiling points of the two substances.
When is water in a living part of the environment and when is it in a non-living part?
Answer:
Down >3
Explanation:
The nonliving processes such as evaporation, precipitation, etc... water returns back into the atmosphere.Explanation:Water moves through the help of living organisms in an ecosystem. Although, the non-livings processes are also the main partners of this process.Plants absorbs water through their root system and loss by transpiration. Watere also moves through the living organisms in an ecosystem. Other nonliving processes such as evaporation, precipitation, water returns back into the atmosphere!
Sorry For Miss Spelling >3
How many valence electrons are in Bi³+?
Which family is most often used to conduct electricity?
O halogens
alkali metals
transition metals
noble gases
Transition Metals is more often used to conduct electricity. Transition metals have free electrons in outer energy levels because d-orbitals shields poorly. That's why transition metals are good conductor of heat and electricity.
Do transition metals conduct electricity?Transition metals are similar to main group metals in many ways, including their metallic appearance, malleability and ductility, ability to conduct heat and electricity, and ability to form positive ions.
Why do they go by the name transition metals?In the periodic table, transition metals are found between s-block and p-block elements. D-block elements is the name given to them. A family of metals that display instability and transitional behavior between s block and p block elements are referred to as "transition metals."
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What is Structural isomers
Use the data in the table below to answer the following questions. The true value for this data set is 5.68g.
1) The student which is neither precise nor accurate is student B
2) The student which is most accurate on any single trial is student A
3) The student that is both precise and accurate is student C
4) The student which is precise but not accurate is student D
What is precision and accuracy?The term precision has to do with the fact that the values of the measurement are close together. Precise values do not scatter a lot. They vary within a narrow range.
An accurate measurement is one that is close to the true value. This means that it does not differ so much from the true value of the measurement.
Hence;
1) The student which is neither precise nor accurate is student B
2) The student which is most accurate on any single trial is student A
3) The student that is both precise and accurate is student C
4) The student which is precise but not accurate is student D
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H2O2 can be used as a disinfectant; it decomposes as: 2 H2O2 → 2 H2O + O2
If the rate of disappearance of H2O2 is 0.038 Ms–1, what is the rate of appearance of O2 in Ms-1?
Enter your answer to 3 decimal places. Do not include units. Make sure to round correctly
We are given a balanced chemical equation and the rate of O² appearance (0.0014 M/s) in the inquiry.
We may easily multiply the mole ratio by the rate of disappearance of H²O² to obtain the rate of disappearance. As a result, the rate at which disappears is 0.0028 M/s.
Does the disappearance rate always go downhill?The rate of disappearance for reactants is a positive (+) value. Because goods are being made rather than vanishing, their rate of disappearance (-) is negative. Reactants are vanishing rather than being generated, hence their rate of formation is a negative (-) value.
The rate of disappearance may be defined as the speed at which a reactant dissipates after being consumed in the course of the reaction. Four moles of nitric oxide and six moles of water are produced in the reaction above when one mole of sulphur dioxide and one mole of ammonia are combined.
A response always happens at a positive pace.
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What is a chemical formula?
Othe expression of the number of electrons in a compound
Othe expression of the chemical composition of a compound
Othe expression of the number of protons in a compound
Othe expression of the state of matter in a compound
The statement that defines a chemical formula is as follows: the expression of the chemical composition of a compound (option B).
What is a chemical formula?A chemical formula in chemistry is a notation indicating the number of atoms of each element present in a compound.
The chemical formula shows the type and number of atoms of each element that makes up the compound.
For example; in the compound that has a chemical formula of C₂H₂. This shows that atoms of carbon and hydrogen are present in ratio 2:2.
Therefore, the statement that defines a chemical formula is as follows: the expression of the chemical composition of a compound.
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Plants have a rigid outer layer called the cell wall the function of the cell wall is to-
Answer:
Hold the cells shape.
Explanation:
The cell wall is the structure for the plant cell outside the cell membrane.
PLEASE HELP "4s2 is the amount of energy in the atom"
Using the terms energy level, sub level, and number of electrons explain WHY this misconception is incorrect and what "4", "s" and "2" represent in electron configurations.
The two electrons are found in the N shell of the atom and in a spherically symmetrical orbital.
What is electron configurations?The electron configuration refers to the manner in which electrons are arranged in an atom. The electron in an atom are arranged in shells and subshells. The shells are shown by the principal quantum number which the subshells are shown by the orbital quantum number.
The orbital where the electron is found has a direct corroboration to the energy of the electron. The more radially outwards from the nucleus the orbital is as evidenced by the orbital quantum number, the higher the energy of the electron.
Now the designation"4s^2" implies that the two electrons are found in the N shell of the atom and in a spherically symmetrical orbital.
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Question
Why do cell organelles have specialized functions?
So all cells can conduct photosynthesis
So all cells can conduct photosynthesis,
To make movement differ throughout a cell's life cycle
To make movement differ throughout a cell's life cycle,
To help a cell perform different cell activities
To help a cell perform different cell activities,
To dissolve the cell when it dies
The cell organelles have specialized functions in order to help a cell perform different cell activities (Option 3 is correct).
What are cell organelles?The cell organelles are membrane-bound structures inside eukaryotic cells that help them to perform specialized functions such as protein synthesis (ribosomes), photosynthesis (chloroplasts), lipid processing (RE and Golgi), enzymatic degradation (lysosomes), etc.
In conclusion, the cell organelles have specialized functions in order to help a cell perform different cell activities (Option 3 is correct).
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Calculate the number of atoms of 13.555 g Pt
Answer:
4.1843 x 10²² atoms Pt
Explanation:
To find the number of platinum (Pt) atoms, you need to (1) convert grams to moles (using the atomic mass) and then (2) convert moles to atoms (using Avogadro's number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 5 sig figs to match the amount of sig figs in the given value (13.555).
(Step 1)
Atomic Mass (Pt): 195.08 g/mol
13.555 grams Pt 1 mole
--------------------------- x ------------------------- = 0.069484 moles Pt
195.08 grams
(Step 2)
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
0.069484 moles Pt 6.022 x 10²³ atoms
--------------------------------- x --------------------------------- = 4.1843 x 10²² atoms Pt
1 mole
a chart which list all of the known elements are?
Answer:
The chart is called the Periodic Table.
Hope this helps :)
How many atoms are in 1.50 mol of carbon-12? How many grams does this much carbon-12 weigh
The number of atoms that are in 1.50 mol of carbon-12 is 18g.
1 mol of any substance contains 6.022×1023 atoms/molecules
So 1.50 moles of carbon will have 1.50×6.022×1023 atom = 9.0×1023 atoms
Now, number of moles = weight g /molar mass gmol-1
1.5= weight g/ 12 gmol-1.
So weight = 1.5 mol×12gmol-1 = 18 g
Mole is the unit for the measurement of quantity of a substance.The number of moles is used a unit of measure large number of atoms and the other components.Mole is the standard unit for amount of substance.The elementary numbers of a certain substance are present in a substance or sample is determined by the quantity of that material.To learn more about moles visit:
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C.E.R.: How Could the continents moved apart?
As the seafloor grows wider, the continents on opposite sides of the ridge move away from each other.
Moving from the element with atomic number 10 to atomic number 11 on the periodic table, there is a change in reactivity. In three to five sentences, identify the direction of the change, and give two reasons for the change.
The change in reactivity is as follows;
The element with atomic number 10 is a noble gas belonging to group 8A and is inert chemicallyThe element with atomic number 11 is a metal belonging to group 1A with high reactivityThe reactivity of the elements change from non-reactive to very reactive.What is periodicity?Periodicity is the variation of the physical and chemical properties of in a regular pattern down the group and across a period.
The periodicity of elements in the periodic table is as follows;
Metallic property decreases from left to right cross a periodNon-metallic character increases from left to across a periodMetallic character increases on going down a groupNon-metallic character decreases on going down a given groupConsidering the change in reactivity that occurs moving from the element with atomic number 10 to atomic number 11 on the periodic table;
The element with atomic number 10 is a noble gas belonging to group 8A and is inert chemicallyThe element with atomic number 11 is a metal belonging to group 1A with high reactivityThe reactivity of the elements change from non-reactive to very reactive.In conclusion, noble gases b chemically whereas group 1A elements are very reactive metals.
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What is the oxidation number of N in NH4HCO3?
Answer:
For numerical purposes however, we can assume that each nitrogen is in +1 and overall oxidation... The oxidation of nitrogen in NH4+ is -3. The hydrogen atoms have +1 and there are four of them. And net charge on the molecule is +1.
Explanation:
A heliox deep-sea diving mixture contains 3.6g of oxygen to every 96.4g of helium. WHat is the partial pressure of oxygen when this mixture is delivered at a total pressure of 8.4 bar?
The partial pressure of oxygen gas when this mixture is delivered at a total pressure of 8.4 bar is 0.0039 bar.
What is the partial pressure of oxygen gas in the mixture?The partial pressure of oxygen gas in the Heliox deep-sea diving mixture that contains 3.6g of oxygen to every 96.4g of helium is calculated as follows:
Moles of oxygen gas = mass/molar mass
mass of oxygen gas = 3.6 g
molar mass of oxygen gas = 32.0 g
moles of oxygen gas = 3.6/32
moles of oxygen gas = 0.1125 moles
Moles of helium gas = mass/molar mass
mass of helium gas = 96.4 g
molar mass of helium gas = 4.0 g
moles of helium gas = 96.4/4
moles of helium gas = 24.1 moles
Total moles of gases = 24.1 + 0.1125
Total moles of gases = 24.2125
Partial pressure of oxygen gas = mole fraction of oxygen gas * total pressurePartial pressure of oxygen gas = 0.1125/24.2125 * 8.4 bar
Partial pressure of oxygen gas = 0.0039 bar
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An antacid contains 200 mg of aluminum hydroxide.
A. How many moles of Al(OH)3 does each capsule contain?
B. How many µg of oxygen does each capsule contain?
A. The number of mole of Al(OH)₃ in the capsule is 0.0026 mole
B. The mass (in µg) of oxygen in the capsule is 124800 µg
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
A. How to determine the mole of Al(OH)₃From the question given above, the following data were obtained:
Mass of Al(OH)₃ = 200 mg = 200 / 1000 = 0.2 gMolar mass of Al(OH)₃ = 27 + 3(16 + 1) = 78 g/mol Mole of Al(OH)₃ =?Mole = mass / molar mass
Mole of Al(OH)₃ = 0.2 / 78
Mole of Al(OH)₃ = 0.0026 mole
B. How to determine the mass (in µg) of oxygen1 mole of Al(OH)₃ contains 48 g of oxygen.
Therefore,
0.0026 mole of Al(OH)₃ will contain = (0.0026 mole × 48 g) / 1 mole = 0.1248 g of oxygen
Divide by 1000000 to express in µg
Mass of oxygen = 0.1248 / 1000000
Mass of oxygen = 124800 µg
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Given the following thermochemical equation detailing the combustion of glucose
C6H12O6(s) +602(g) → CO₂(g) + 6H₂O(g) AHxn=-2803 kJ/mol C6H12O6
determine the amount of glucose needed to release 30 kJ of energy.
1.93g of glucose is required to produce 30KJ of energy
One of the carbohydrates referred to as simple sugars is glucose, commonly known as dextrose (monosaccharides). The chemical formula for glucose is C6H12O6, which means "sweet" in Greek. It is the main free sugar present in higher animals' blood and can be found in fruits and honey. It is the source of energy for cellular activity, hence controlling its metabolism is crucial (see fermentation; gluconeogenesis).
Starch molecules, which make up the majority of plant's energy reserves, are made up of countless linear glucose units. Cellulose is a significant molecule made primarily of glucose and is likewise linear. D-glucose is a chemical found in dextrose. Glycogen, the reserve carbohydrate found in the majority of vertebrate and invertebrate animal cells as well as those of countless fungi and protozoans, is a similar molecule in mammals.
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