The spectroscope has changed the way scientists looked for elements in that it allows for the identification of elements from compounds without a need to decompose the compounds.
What is a spectroscope?A spectroscope also known as a spectrometer is an instrument that produces and analyzes the spectra or absorption lines using visible light.
The spectrometer measures and interprets the electromagnetic spectra that result from the interaction between electromagnetic radiation and matter.
These measurements are obtained or determined from the wavelength or frequency of the radiation.
A spectroscope is used to analyze and study the elemental components of compounds without having to decompose the compounds into elemental substances.
Thus, spectroscopes have proved to be useful in the study of the properties of elements in compounds.
Compounds are formed when two or more elements are combined together.
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which test tubes are controls in the experiment?
The control test tubes had substrates added but no enzymes and they are test tubes 1, 3, 5, and 7.
What are controls in an experiment?The control in an experiment is that variable or quantity to which no change has been applied.
The control in an experiment does not receive the treatment given to the study group or they may only receive a blank or a placebo.
Considering the given experiment to investigate the influence of temperature on enzyme function:
The control test tubes are those test tubes to which substrates were added but no enzymes were added.
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Complete question:
A student designs an experiment to investigate the influence of temperature on enzyme function. The student's plan is presented in Table 1. Which test tubes are controls in the experiment?
20 POINTS TO FIRST PERSON WITH AN ANSWER! PLEASE HURRY!
In a physical change, the appearance or form of the matter changes but the kind of matter in the substance does not. However, in a chemical change, the kind of matter changes, and at least one new substance with new properties is formed.
does complexation equation and ionic equation the same?
Answer:
.,....................k
Solve the problems. Express each answer to the correct number of significant figures.
Type the correct answer in each box.
410 - 52 =
3.054 + 1.16 =
Answer:
410-52=360
3.054+1.16=4.21
Explanation:
A flashbulb of volume 2.6L contains O₂ gas at a pressure of 2.3atm and a temperature of 26°C. How
many moles of oxygen gas does the flashbulb contain? don't forget to convert °C to K *
Answer:
See below
Explanation:
Ideal gas law PV = n R T
P = 2.3 atm
V = 2.6 L
n = ?
R = .08205 L atm / (mole K)
T = 26 + 273.15 K
Plugging in the numbers finds n = .244 moles
13. What is the atomic mass of an atom if its mass is approximately equal to the following? 1 a. that of carbon-12 b. 4.5 times as much as carbon-12
The atomic mass of an atom if its mass is approximately equal to carbon-12 will be 12 and in case of 4.5 times carbon-12 will be 54
Atomic mass of an element is the average mass of the atoms of an element which are measured in atomic mass unit. Or we can also say that the atomic mass is actually the weighted mass is a weighted average of all of the isotopes of elements, in which the mass of each element is multiplied by the abundance of that particular isotope.
So the atomic mass of an atom if the mass is approximately equal to carbon-12 then the mass of the element will be equal to 12 as the atomic mass of carbon-12 is 12.
where as the atomic mass of an atom if its mass is approximately equal to 4.5 times as much as carbon-12 will be ⇒ 4.5×12= 54
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A chef is going to use a mixture of two brands of Italian dressing. The first brand contains 6% vinegar, and the second brand contains 11% vinegar. The chef wants to make 290 millimeters of a dressing that is 8% vinegar. How much of each brand should she use?
Answer:
174 milliliters of the first brand and 116 milliliters of the second brand
Explanation:
equation:
0.06x+0.11(290-x)=0.08(290)
translation:
6% concentration of x milliliters plus 11% concentration of 290-x milliliters equals 8% concentration of 290 milliliters
solve for x (which is the volume of the first brand):
0.06x+0.11(290-x)=0.08(290)
0.06x+31.9-0.11x=23.2
-0.05x+31.9=23.2
-0.05x=-8.7
x=174
174 milliliters of the first brand and 290-174=116 milliliters of the second brand
A cylindrical can without a top is made out of metal material with a total area of 1500π cm2. Find the dimensions that will maximize the volume held by the can.
The dimensions that will maximize the volume held by the can r= 5.23 cm, S = 37.1 cm².
Given, Height = 10.84 cm, radius of the base = 5.42 cm and material for the surface =37 square cm.
Let the height be h and the base's radius be r.
Then, volume V= πr²h= 1000cc
and surface area of the can,
S= 2πr²+ 2πrh
Now, eliminating h,
S= S(r)= 2π(r²+ 1000/ πr²)
r= (1000/ 2π)^1/3= 5.23 cm, nearly.
Correspondingly, h= 10.84 cm, nearly
There is no maximum for S. Also,
S''= 2π(2+ 3000πr4)>0.
For this r= 5.23 cm, S = 37.1 cm²
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Which statement is correct about the properties that define a particular kind of mineral?(1 point) Responses A particular mineral is defined by neither its chemical composition nor crystalline structure. A particular mineral is defined by neither its chemical composition nor crystalline structure. A particular mineral is defined only by its crystalline structure. A particular mineral is defined only by its crystalline structure. A particular mineral is defined only by its chemical composition. A particular mineral is defined only by its chemical composition. A particular mineral is defined by its chemical composition and crystalline structure.
Answer:A particular mineral is defined by its chemical composition and crystalline structure.
Explanation:
Statement which is true about minerals is that a particular mineral is defined by its chemical composition and crystalline structure.
What are minerals?Minerals are defined as a chemical compound which has a well -defined composition and possesses a specific crystal structure.It occurs naturally in the pure form.
If a compound occurs naturally in different crystal structure then each structure is considered as a different mineral.The chemical composition of a mineral varies depending on the presence of small impurities which are present in small quantities.
Some minerals can have variable proportions of two or more chemical elements which occupy equivalent position in the crystal structure.It may also have variable composition which is split into separate species.
Physical properties of minerals include color,streak, luster,specific gravity and cleavage.
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A Galaxy is a grouping of what
A galaxy is a huge group of collection of dust, gas and billions of stars and their solar systems.
What is a galaxy?
A galaxy is the group of starts and some other objects of the space held together by gravity. The universe consists of more than 100 billion galaxies. A lot of dark matter is also found in the galaxies.
The galaxy where earth is present is called the milky way. Almost all the galaxies are thought to contain a supermassive blackholes at the center of the galaxies. The milky way is a spiral galaxy which has the disk, the nucleus and the halo. They contain stars, moons, comets, planets, neutron stars, dust and black holes.
Therefore, galaxy is a grouping of dust, stars, moons, comets and more than a billion stars with a black hole in the center held together by the gravity.
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The oxidation of chromium solid is represented by the following equation: 4 Cr + 3 0₂ - 2 Cr₂O3 How many moles of chromium (III) oxide are produced when 34.69 g Cr reacts with excess oxygen gas?
Moles of chromium (III) oxide is produced when 34.69 g Cr reacts with excess oxygen gas is 0.67 mole.
When oxygen combines with detail or compound, an oxidation response occurs. Oxidation also can be defined because of the manner in the elimination of hydrogen from the reactant species. Oxidation is the process of dropping electrons by using a molecule, atom, or ion.
Calculation:-
Cr + 3 0₂ - 2 Cr₂O3
Molar mass of chromium is = 52
mole = mass / molar mass
= 34.69 / 52
= 0.67 mole
When a reactant loses electrons for the duration of a response, it's far known as oxidation. whilst a reactant accumulates electrons throughout a reaction, it's miles known as reduction. when metals react with acid, that is a common incidence. while a reactant loses electrons all through a response, it is referred to as oxidation.
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Energy is given off during a chemical reaction because ____________________ are combining with other __________________________.
Answer:
electrons are combining with other electrons
In noncyclic photophosphorylation, electrons flow in a one-way path from water to.
In noncyclic photophosphorylation, electrons flow in a one-way path from water to NADP⁺.
Photophosphorylation is the conversion of ADP to ATP by using the sunlight. the water molecules is split into the hydrogen and the oxygen this whole process is known as photolysis. In noncyclic photophosphorylation, electrons flow in a one-way path from water to NADP⁺ known as hill reaction. The process of cooperative production of energy is called as non cyclic photophosphorylation. The proton produces by the splitting of water molecule is combine with electron reduces the NDAP to NDAPH₂.
Thus, In noncyclic photophosphorylation, electrons flow in a one-way path from water to NADP⁺.
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O2 (g) + 2 H₂ (g) → 2 H₂O (g) + Energy
exothermic or
endothermic
O₂ (g) + 2 H₂ (g) → 2 H₂O (g) + Energy , this is exothermic process.
An exothermic process releases heat and raises the temperature of adjacent areas. Endothermic processes absorb heat and cool the environment.
A chemical reaction or physical change is endothermic when a system absorbs heat from the environment. During endothermic processes, the system gains heat from the environment, resulting in a decrease in the temperature of the environment.
In thermochemistry, an endothermic process is a thermodynamic process accompanied by an increase in the enthalpy H of the system. In such processes, closed systems typically absorb thermal energy from the surroundings and transfer heat to the system.
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Part A
How much heat is required to melt 37.2 g of ice at (0 °C)? The heat of fusion for water is 6.02
kJ/mol.
Express your answer in kilojoules to three significant figures.
12.4 kJ of heat is required melt 37.2 g of ice at (0 °C)
What is Latent heat?
The equation is used to establish a relationship between how much heat is involved when a number of moles of a substance undergoes a phase change.
Equation for heat flow at constant temperature and pressure:
q = n *ΔH
where
q = amount of heat ?
n = no of moles
ΔH = enthalpy ( 6.02 kJ/ mol)
For water, the molar enthalpy of fusion is 6.02 kJ/ mol. It means , in order to convert 1 mol of solid ice at 0 °C to water at 0° C , we need to impart 6.02 kJ of heat
We know
n = w / M.M
n = moles
w = given mass ( 37.2 g )
M.M = molar mass ( molar mass of water)
n = 37.2 / 18
= 2.06
Substituting:
q = n * ΔH
= 2.06 * 6.02
= 12.401 kJ
Rounding to 3 significant figures., q = 12.4 kJ
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If a hydrate of the formula mcly⋅xh2o decomposes when heated to produce hcl, what change would you expect to occur when a piece of blue litmus paper is held in the path of the vapor released?.
Blue litmus paper turns red. xH2O is heated it decomposed to produce HCl which is the cause for a change in color.
Blue litmus paper is mainly used for acid testing. It turns red when it comes in contact with acid. It remains blue in contact with basic or neutral substances. The dye in blue litmus reacts with the H+ ions and is chemically changed so that the bonds are tuned to reflect longer wavelength light, appearing red to our eyes.
A simple way to measure pH is to use litmus paper. When litmus paper is touched it changes color depending on whether the paper is acidic or basic. If the paper turns red it is acidic if it turns blue it is basic. There is no reaction when blue litmus paper is placed on the pad, so there is no change in the blue litmus paper.
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I NEED HELP RIGHT NOW PLEASE!
Use your own words.
Thomson's model was "wrong," as Rutherford demonstrated in 1911: the distribution of positive and negative particles was not uniform. Rutherford demonstrated that the atom's tiny, heavy, positively charged nucleus is present.
Why was J.J. Thomson wrong?In 1904, Thomson came up with his atomic model. A "Christmas cake" model, as we North Americans would say.He presumptively believed that inside a sphere of positive charge, the electrons were evenly distributed and unrestricted in their ability to spin in rings.Because there was so much positive matter inside each orbit, when an electron moved away from the positive cloud's nucleus, it experienced a greater net inward force. This helped to stabilize the orbits.His model became known as the plum pudding model because other people—not Thomson—compared it to the British dessert known simply as plum pudding.The raisins and nuts in a round Christmas cake are what many North Americans would liken it to.The Thomson model was rejected by the Japanese physicist Hantaro Nagaoka.He proposed that the nucleus of the atom was extremely large.Much like Saturn's rings, the electrons swung around the nucleus.When it came to the distribution of positive and negative particles, Rutherford demonstrated in 1911 that Thomson's model was inaccurate.The atom's small, massive, positively charged nucleus was demonstrated by Rutherford.Along with Nagaoka, he concurred that the electrons orbit the nucleus in a spherical fashion.To Learn more About Thomson's model refer to :
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Compare models B and D.
It is possible to remove a negatively charged particle
from an atom using electrical forces (Thompson, 1897).
Which model supports this evidence?
The possibility of the removal of the electron from an atom using electrical forces was supported by plum pudding model by J. J. Thomson.
What is plum pudding model?
Plum pudding model was first discovered by J. J. Thomson in the year 1904 after the discovery of electrons. This model depicts that the electrons are embedded in the the pool of positive charges in the atom. It was called plum pudding model because the electrons were like the plums in the positively charged atom like a pudding.
According to the plum pudding model by J. J. Thomson, the electrons are embedded on the positively charged particles in the atom. These electrons can be removed by applying a particular voltage of electric forces from the atoms.
Therefore, plum pudding model of J. J. Thomson supported the removal of electron from the atom by applying electric force.
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the process of dividing a cell's cytoplasm and organelles
Answer:
Anaphase/Telophase
Explanation:
Anaphase is the phase where the cell is dividing the chromosomes and organelles. Telophase is a more of a moment in the process of replication than a definable "phase"
What is most likely to be the chemical formula for diamond?
A. C
О B. CD
O C. C100
O D. CO
Carbon C diamond is one form of carbon; the other is graphite.
The correct option is A.
Briefing:Both graphite and diamond are carbon allotropes. Although graphene and fullerenes are among the rarer unusual allotropes of carbon, they do exist. An enormous three-dimensional network of carbon atoms makes up a diamond.
What is chemical formula ?A chemical equation is a phrase that enumerates a compound's component elements and their respective weights. If there is just single atom of a particular sort, no subscript is necessary. If an atom contains three or more of a specific type of atom, a subscript is appended to a symbol for that atom.
What is the importance of chemical formula ?Chemical equations provide details about the chemical composition of a compound. They also represent the proportions in which the compound's individual components come together to create the compound. The chemical formula of a compound is crucial when describing it in a chemical equation.
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What is the molar ratio of acid to base for the neutralization reaction between hcl and naoh?.
The mole ratio of acid to base when neutralizing hydrochloric acid with sodium hydroxide is 1:1. A mole of NaOH would completely neutralize one mole of HCl.
The mole ratio would be 2:1 if the hydrochloric acid and barium hydroxide were to be combined instead. Assuming they react in a 1:1 ratio in accordance with the balanced neutralization equation, the moles of acid and base are identical at the equivalence point in a neutralization. Using the reaction between solutions of hydrochloric acid and sodium hydroxide as an example, let's examine how a neutralization reaction creates both water and a salt. This reaction's general equation is NaOH + HCl H2O and NaCl.
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How can you observe a plant giving off oxygen during photosynthesis
A plant giving off oxygen during photosynthesis comes from water .
The plants takes up the carbon dioxide and the water and in the presence of sunlight releases the oxygen as the by product in the process of the photosynthesis. in the process of the photosynthesis , the chlorophyll excited by the sunlight. in the presence of this the water undergoes the photolytic oxidation. this means that water is breaking down in to the hydrogen ion , electrons and the free oxygen. there are various experiments that shows that the source of oxygen is the water.
Thus, A plant giving off oxygen during photosynthesis comes from water .
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What mass of BaCl2 is needed to make 0.500 L of a 0.250 M BaCl2 solution ? A. 0.125g B. 2.00g C. 21.6g D. 26.0g
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the mass of barium chloride is 0.80g.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
Molarity= number of moles of solute÷ volume of solution in liter (1)
Where,
moles= given weight ÷ molecular weight
= w÷ 208.23 g/mol
Substituting values in equation 1, we get
0.250 M =(w/ 208.23 )/(0.500 L)
w=26.0g
Therefore, the mass of barium chloride is 0.80g.
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a volume of 2 dm³ of nitrogen and 1 dm³ of oxygen, both at a pressure of 101.3 kPa, are put into a container with a volume of 3 dm³. What is the partial pressure of each gas in the mixture?
The partial pressure of nitrogen is 0.59 atm and the partial pressure of oxygen is 0.29 atm.
given that :
pressure = 101.3 kpa = 0.99 atm = 1 atm
volume of nitrogen = 2 dm³ = 2 L
volume of oxygen = 1 dm³ = 1 L
Temperature = 273 K
using ideal gas equation , we get
P V = nRT
moles of nitrogen = P V / RT
= ( 1 × 2 )/ 0.082 × 273
= 2 / 22.38
= 0.08 mol
moles of oxygen = ( 1 ×1 ) / 0.082 × 273
= 0.04 mol
now, P V = n RT
P = n RT /V
partial pressure of nitrogen = ( 0.08 × 0.082 × 273 ) / 3
= 0.59 atm
partial pressure of oxygen = ( 0.04 × 0.082 × 273 ) / 3
= 0.29 atm
Thus, The partial pressure of nitrogen is 0.59 atm and the partial pressure of oxygen is 0.29 atm.
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Which of the compounds can in principle be isolated in optically active form at room temperature? select all valid choices.
a local humane society houses 300 animals.the ratio of cats to all animals is 7 : 15
can someone help a lazy man out
The equation of the reaction is written as; [tex]4Al(s) + 3O_{2} (g) ---- > 2Al_{2} O_{3} (s)[/tex]
What is a reaction?It is common to see that in science, we have the combination of two substances and as the substances are combined there is a cleavage of the bonds that holds the molecules of the substances together and then new bonds are formed as the molecules are recombined in the products.
In this case we want to see the reaction between oxygen and aluminum. Now the word equation is aluminum + oxygen -----> aluminum oxide. The reaction equation would show the actual atoms that combined.
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What element is the most abundant in stars including the sun?
Answer:
Hydrogen and helium are by far the most abundant elements found in the Sun, making up about 98 percent of its mass,
What do you think his hypothesis was?
a. Maggots grow through spontaneous
generation.
b. Maggots come from eggs laid by flies.
c. Maggots find their way into woods and
meats.
d. The problem cannot be solved.
His hypothesis was that b) maggots come from eggs laid by flies.
Redii demonstrated that maggots do not spontaneously generate from rotting meat. He placed three jars containing rotting meat, each covered with different kinds of material. One jar was covered with a fine cloth, one with gauze, and one with cork.
Flies were observed landing on all three jars of meat, but after eight days, only the jar covered with the gauze had maggots on the meat. Redii observed the maggots on the meat and concluded that they had not spontaneously generated, but had come from the eggs of the flies that had landed on the meat.
From this, he concluded that maggots only form on meat that is exposed to the air, and not on meat that is sealed in a jar. This showed that it was not "spontaneous generation" that was creating the maggots, but rather that they were being laid by flies.
This is because he put meat in different locations and found that maggots only appeared where there were flies.
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if a piece of alumuiniam(Al) fail measuring 24cm by 31cm has a mass of 10.35g(density of Al=2.70gcm-3)find the thickness of the fail in millimater?
Thickness of the fail in millimeter is 0.051mm
Thickness is the quality or state of being thick
Here given data is
aluminum(Al) = 24cm by 31cm
Mass =10.35g
Density = 2.70gcm³
We have to find the thickness of the fail in millimeter = ?
So the formula is
thickness = Volume/surface area
So first we have to calculate volume
Volume = mass/density
Volume = 10.35g/ 2.70gcm³
Volume = 3.83
Then the area of foil is
Area = 24cm×31cm
Area = 744cm²
Thickness = volume/area
Thickness = 3.83/744cm²
Thickness = 0.0051cm = 0.051mm
Thickness of the fail in millimeter is 0.051mm
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Semiconductor materials with band gaps greater than 3. 5 ev are considered to be a?.
Semiconductor materials are categorized as insulators if their band gaps are bigger than 3 and 5 eV.
What is the main idea here?Due to the low but finite band gap energy of semiconductor materials, an electron can easily transition from the valence band to the conduction band in the presence of external thermal energy. A semiconductor material's typical band gap energy range is 0.5eV–3eV.
What are the semiconductor materials' band gaps?Wide-bandgap materials have bandgaps above 2 eV, in contrast to conventional semiconductors like silicon, whose bandgaps are in the range of 0.6 to 1.5 eV.
What are semiconductors of the p type ?In a p-type semiconductor, holes make up the majority of the carriers while electrons make up the minority.
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