O2 (g) + 2 H₂ (g) → 2 H₂O (g) + Energy
exothermic or
endothermic

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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The control test tubes had substrates added but no enzymes and they are test tubes 1, 3, 5, and 7.

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?

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 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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The mass in grams of  23.0 L of propane vapor at  STP is 22.968 g.

Given data :

So the mass of 23 L of propane is  44×0.522 = 22.968 g.

Therefore, 23 liters of propane contain 22.968 g of propane at STP.

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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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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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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.

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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 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.

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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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

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"

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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Answer:

.,....................k

Semiconductor materials are categorized as insulators if their band gaps are bigger than 3 and 5 eV.

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.

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.

In a p-type semiconductor, holes make up the majority of the carriers while electrons make up the minority.

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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.

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Answer:

Hydrogen and helium are by far the most abundant elements found in the Sun, making up about 98 percent of its mass,

a local humane society houses 300 animals.the ratio of cats to all animals is 7 : 15

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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Answer:

electrons are combining with other electrons

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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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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Answer:

410-52=360

3.054+1.16=4.21

Explanation:

Carbon C diamond is one form of carbon; the other is graphite.

The correct option is A.

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.

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.

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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The balanced chemical equations are as follow:

C2H4 + 3O2 ------- 2CO2 + 2H2O

A chemical equation is said to be balanced if the number of atoms or molecules of elements on reactant side is equal to the number of atoms or molecules of elements on product side.

This is based on the law of conservation of mass which says that the mass neither be created nor

be destroyed but it transferred from one form to another form.

The chemical equation is

C2H4 + 3O2 ------- CO2 + H2O

Since, the number of atoms of carbon on reactant side is 2 but on product side, it is 1. So, multiply CO2 by 2. It is balanced.

The number of atoms of Oxygen on reactant side is 2 but on product side, it is 5. So, multiply O2 by 3. It is balanced.

The number of atoms of Hydrogen on reactant side is 4 but on product side, it is 2. So, multiply H2O by 2. It is balanced.

Thus, we concluded that the balanced chemical equations are as follow:

C2H4 + 3O2 ------- 2CO2 + 2H2O

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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

Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space. Earth rotates eastward, in prograde motion. As viewed from the northern polar star Polaris, Earth turns counterclockwise.

The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where Earth's axis of rotation meets its surface. This point is distinct from Earth's North Magnetic Pole. The South Pole is the other point where Earth's axis of rotation intersects its surface, in Antarctica.

Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 minutes and 4 seconds with respect to other distant stars (see below). Earth's rotation is slowing slightly with time; thus, a day was shorter in the past. This is due to the tidal effects the Moon has on Earth's rotation. Atomic clocks show that a modern day is longer by about 1.7 milliseconds than a century ago,[1] slowly increasing the rate at which UTC is adjusted by leap seconds. Analysis of historical astronomical records shows a slowing trend; the length of a day increased about 2.3 milliseconds per century since the 8th century BCE.[2]

Scientists reported that in 2020 Earth had started spinning faster, after consistently spinning slower than 86,400 seconds per day in the decades before. On June 29, 2022, Earth's spin was completed in 1.59 milliseconds under 24 hours, setting a new record.[3] Because of that trend, engineers worldwide are discussing a 'negative leap second' and other possible timekeeping measures. [4]

This increase in speed is thought to be due to various factors, including the complex motion of its molten core, oceans, and atmosphere, the effect of celestial bodies such as the Moon, and possibly climate change, which is causing the ice at Earth's poles to melt. The masses of ice account for the Earth's shape being that of an oblate spheroid, bulging around the equator. When these masses are reduced, the poles rebound from the loss of weight, and Earth becomes more spherical, which has the effect of bringing mass closer to its centre of gravity. Conservation of angular momentum dictates that it spins faster, like a spinning ice skater drawing their arms in, causing them to spin faster.

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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 equation of the reaction is written as; [tex]4Al(s) + 3O_{2} (g) ---- > 2Al_{2} O_{3} (s)[/tex]

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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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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