Can starch and flour be used interchangeably in all cases? Explain.

Answer:

Heat is transferred from the warmer block to the cooler block

Explanation:

Heat transfer by conduction involves two or more solids. The heat generally moves from a part at higher temperature to one with a lower temperature.

Answer:

We can begin by using the balanced chemical equation for the reaction between carbon monoxide and oxygen:

2CO + O2 -> 2CO2

This tells us that 2 volumes of CO react with 1 volume of O2 to produce 2 volumes of CO2. Since we have equal volumes of CO and O2, the limiting reactant will be the one that requires more volume, which is the CO:

2 volumes of CO + 1 volume of O2 -> 2 volumes of CO2

Using the ideal gas law, we can convert the volumes of CO and O2 at STP (standard temperature and pressure, which is 0°C and 1 atm) to moles:

n(CO) = V(CO) / Vm = 60 cm3 / 22.4 L/mol = 0.00268 mol

n(O2) = V(O2) / Vm = 30 cm3 / 22.4 L/mol = 0.00134 mol

Since 2 volumes of CO react with 1 volume of O2, we can say that the reaction will use up 2 x 0.00134 = 0.00268 mol of O2. Since we have 0.00134 mol of O2 initially, this means that all of the O2 will be used up in the reaction, leaving none in the residual gases. The reaction will also produce 2 x 0.00268 = 0.00536 mol of CO2.

Using the ideal gas law again, we can convert the volume of CO2 produced to a volume at STP:

V(CO2) = n(CO2) x Vm = 0.00536 mol x 22.4 L/mol = 0.120 cm3

Therefore, the volume of residual gases after the reaction is:

V(residual) = V(total) - V(CO) - V(O2) - V(CO2) = 90 cm3 - 60 cm3 - 30 cm3 - 0.120 cm3 = 0.880 cm3

Answer:

D. The mass of the sample and the masses of the elements found in the sample.

Answer:

Long bones contain yellow bone marrow and red bone marrow, which produce blood cells.

Explanation:

Have a nice night!

The majority of your blood cells are produced in your bone marrow. This is known as haemopoiesis. In children, haemopoiesis occurs in the long bones, such as the thighbone (femur). Adults have it mostly in their spine (vertebrae), hips, ribs, skull, and breastbone (sternum).

Hematopoiesis is the process by which all the cellular components of blood and blood plasma are produced. It happens in the hematopoietic system, which includes organs and tissues like bone marrow, liver, and spleen. Simply put, hematopoiesis is the process by which the body produces blood cells.

The bone marrow is where blood cells are created. The soft, spongy material in the center of the bones is called bone marrow. It generates approximately 95% of the body's blood cells. The pelvic bones, breastbones, and spine bones contain the majority of the adult body's bone marrow.

Red cells are constantly produced in the marrow of certain bones. As previously stated, the marrow is the primary site of red cell production, known as erythropoiesis, in adults.

Thus, The majority of your blood cells are produced in your bone marrow. This is known as haemopoiesis.

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Answer:

See the answer below

Explanation:

When silver is added to dilute sulphuric acid, no reaction would occur. However, silver reacts with hot and concentrated sulphuric acid to produce silver sulphate, sulphur dioxide, and water.

The equation of the reaction is as below:

silver + sulphuric acid --> silver sulphate + water + sulphur dioxide

\(2Ag(s) + 2 H_2SO_4(aq) -->Ag_2SO_4 (s) + 2 H_2O (l) + SO_2 (aq)\)

Answer:

it is directly related to the intermolecular forces present between its molecules

Answer:

Elements and Compounds.

Explanation:

If a building has become accidentally contaminated with radioactivity and initially contained 4.7 kg of strontium-90 and the safe level is less than 10.2 counts/min, then the building will be unsafe for 7.2 x 10^12 seconds.

Radioactivity is the spontaneous emission of radiation from the nucleus of an unstable atom that is accompanied by a decrease in mass and a decrease in charge. There are three types of radioactive emissions : alpha particles, beta particles, and gamma rays.

Steps to solve the given problem :

We can use the following formula to calculate the radioactivity of an element :

Radioactivity = λN

where, λ = decay constant ; N = the number of atoms in the sample

Now we can use the following formula to find the decay constant :

λ = ln2 / t1/2 where, t1/2 = half-life of the substance

To calculate the half-life of strontium-90, we can use the following formula : t1/2 = 0.693 / λ

We know that the atomic mass of strontium is 89.9077 u. Thus, the number of moles of strontium-90 in 4.7 kg of the sample is :

Number of moles = Mass / Molar mass= 4.7 / 89.9077= 0.052252 mol

Now, we can use Avogadro's number to find the number of atoms in the sample :

Number of atoms = Number of moles x Avogadro's number = 0.052252 x 6.022 x 10^23 = 3.1458 x 10^22 atoms

We can use the following formula to find the radioactivity :

Radioactivity = λN= λ (3.1458 x 10^22)

We know that the safe level of radioactivity is less than 10.2 counts/min. Thus, we can set up the following equation and solve for the decay constant :

10.2 = λ (3.1458 x 10^22)λ = 3.24 x 10^-23

We can use this decay constant to find the half-life : t1/2 = 0.693 / λ = 2.14 x 10^13 s

Now we can use the half-life to find the time it takes for the sample to decay to the safe level :

ln (N0 / N) = λtN / N0 = e^(-λt)t = [ln (N0 / N)] / λ

where, N0 = initial number of atoms ; N = final number of atoms

N0 / N = 10.2 / 3.1458 x 10^22= 3.235 x 10^-21

t = [ln (1 / 3.235 x 10^-21)] / (3.24 x 10^-23) = 7.2 x 10^12 s

Therefore, the building will be unsafe for 7.2 x 10^12 seconds.

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The second step in the Gram staining procedure involves the flooding of the slide for the one minute is with iodine . The correct option is B. iodine.

There are the four fundamental steps in the Gram stain process , the first is to apply a base color that is the crystal violet. In second step  adding the Gram's iodine as the mordant. In the third step, the Rapid decolorization with the acetone, the ethanol, or the combination of the two and in the four step,  Using the safranin as the counterstain.

Thus, the iodine will be used in the second step in the Gram staining process that involves the flooding in the slide for one minute.

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Answer:

The water tastes sweet, and it usually appears to be cloudy or not clear.

Explanation:

If nothing dissolves into the water, then it should be clear.

Answer:You can tell if the sugar is still there by boiling off the water and leaving the sugar behind in the container. Sugar is a solid, and therefore cannot evaporate, so when the water reaches boiling point, it will evaporate at a quicker rate than before (water evaporates at any temperature in liquid form; just not enough to be noticeable) and leave the container to become water vapour

Explanation: If you stir a spoonful of sugar into hot water, the sugar will dissolve in the hot water. When sugar or another substance is dissolved in water, it disappears from view and forms a homogeneous mixture with the water, also called a solution.

The balanced chemical equation for the reaction of ammonia and copper oxide is as follows:2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2OThe balanced equation tells us that when 2 moles of ammonia react with 3 moles of copper oxide, 3 moles of copper, 1 mole of nitrogen, and 3 moles of water are produced.

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The change in temperature is 30.52K.

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The correct statement is B. The atomic mass Most atoms of aluminum are Al27.

The atomic mass of an element is the weighted average of the masses of all the naturally occurring isotopes of that element. In the case of aluminum, the average atomic mass is 26.98 amu. This means that most of the naturally occurring aluminum atoms have a mass of 27 amu (Al27), which is the closest whole number to the average atomic mass.

It is important to note that not all aluminum atoms weigh exactly 26.98 amu (option A is incorrect), as there are different isotopes of aluminum with different masses. Option C and D are also incorrect, as the most common isotope of aluminum is Al27, not Al26 or Al13.The correct statement is B, the atomic mass Most atoms of aluminum are Al27.

In conclusion, the average atomic mass of aluminum is 26.98 amu, and most atoms of aluminum are Al27.

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Ionic compounds include at least 1 metal because metals need to donate electrons. (In ionic bonds one compound takes electrons, therefore you need a metal to donate electrons).

Otherwise, with two non-metals the compounds would likely share electrons.

The intermolecular Hydrogen-bonds between CH3CH2OH and H2O are very strong because H atoms are bound to the electronegative O atoms. Therefore, their boiling points are higher.

Since hydrogen is covalently linked to the more electronegative atom oxygen in the molecule CH3OH, hydrogen bonding is present in this compound.

In fact, it results from the fact that whereas each molecule of H2O can generate up to four intermolecular hydrogen bonds, the same molecule of CH3OH can only form up to three.

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Answer:

Steel is a popular material for building because it is strong without being extremely heavy. This makes it the ideal material for large, multi-story buildings and manufacturing and industrial facilities. Unlike wood, steel can stand up to moisture and is not susceptible to termites and fire

Explanation:

mark me brainliest!!

Bonding and the development of trusting relationships are facilitated by the chemical release of oxytocin.

Your brain releases oxytocin, referred to as the "bonding hormone," when you hug someone or engage in other nonsexual touching. By doing this, stress hormones like cortisol and norepinephrine are decreased while the release of additional feel-good hormones like dopamine and serotonin is stimulated.

Chemical bonds, for instance, hold the carbon atom and the two oxygen atoms together in the carbon dioxide (CO2) molecule. Ions bonded together by a chemical bond make up salts, which are substances. For instance, in a crystal of NaCl, table salt, a chemical link holds Na+ and Cl- together.

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Answer:

go for what ever brother GUESS / imagine this gate brainlyist for literally doing nothing.

Explanation:

Answer:

36C

Explanation:

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The expected product is (R)-2-bromobutane.

Stereochemistry plays a crucial role in determining the outcome of chemical reactions. In the given question, the stereochemistry of the intermediate I needs to be considered to determine the expected product.

The intermediate I indicates a chiral carbon center, denoted by an asterisk (*), which means it has four different substituents attached to it. This chiral carbon results in two possible stereoisomers: (R)-2-bromobutane and (S)-2-bromobutane.

When a reaction occurs at a chiral carbon, the stereochemistry of the reactant is usually retained in the product, assuming no racemization or inversion takes place during the reaction. In this case, the intermediate I has an (R) configuration, which implies that the product will also have an (R) configuration.

Therefore, the expected product is (R)-2-bromobutane.

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Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question

mass = 35 g

volume = 7 cm³

The density is

\(density = \frac{35}{7} \\ \)

We have the final answer as

Hope this helps you

Technetium-99m is a radioisotope that is widely used in nuclear medicine for various imaging studies. It is usually produced through a process called generator system from the decay of its parent isotope, Molybdenum-99 (Mo-99).

How technetium-99m is generated:Technetium-99m is generated by a process called a generator system from the decay of its parent isotope, Molybdenum-99 (Mo-99). This generator system is essentially a column packed with a gel-like substance, which is usually made of alumina, silica, or another material. The column contains Mo-99, which is produced in a nuclear reactor, and its daughter isotope Technetium-99m (Tc-99m).The Mo-99 decays into Tc-99m by beta decay, emitting a beta particle and a neutrino.

As a result, Tc-99m is separated from Mo-99 by using a saline solution or another eluant to flush the column. The Tc-99m-containing eluant is then used for imaging studies.There are several advantages to using Tc-99m for imaging studies. It has a short half-life of only six hours, which means that it does not stay in the body for a long time and is eliminated quickly. This makes it safer for patients than isotopes with longer half-lives. Additionally, Tc-99m emits gamma rays, which can be detected by imaging equipment such as gamma cameras. This allows for high-quality imaging studies that can help diagnose a wide range of medical conditions.

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Answer:

Loss of energy to a colder material. Ice forms at 32°F /0° C.

Explanation:

As water cools, the natural movement between the molecules slows until it changes to a solid state (just as it boils to gas if they become too active). This movement doesn't completely stop until the material hits "absolute zero" at -460°F /-273° C. (0° Kelvin).

That's about the temperature "in the shade" in outer space.

A more interesting question would be, "why does water expand when it freezes?" The H - two - O molecule forms a triangle (with the O in the middle).

As it cools, the angle formed by the two H's gets larger. At around 36°F /2° C , the shrinking space between molecules gets overwhelmed by the expanding size of each molecule.

So, for those last few degrees before freezing, the overall volume gets bigger instead of continuing to decrease.

That's what causes potholes in roads (water settles into cracks, then makes the crack larger as it freezes). It's what damages the eaves trough around your roof, breaks leaves down into topsoil and splits boulders in half.

Answer:

The initial temperature of the metal is 84.149 °C.

Explanation:

The heat lost by the metal will be equivalent to the heat gain by the water.  

- (msΔT)metal = (msΔT)water

-32.5 grams × 0.365 J/g°C × ΔT = 105.3 grams × 4.18 J/g °C × (17.3 -15.4)°C

-ΔT = 836.29/12.51 °C

-ΔT = 66.89 °C

-(T final - T initial) = 66.89 °C

T initial = 66.89 °C + T final

T initial = 66.89 °C + 17.3 °C

T initial = 84.149 °C.

Answer:

D Period 1, Group 18

Explanation:

it's helium

it's top right corner of the periodic table

Answer:

Tetrachlorodiborane or Diboron tetrachloride

Answer: the answer is A

Explanation:

Fatty acids are organic molecules that consist of a long hydrocarbon chain and a carboxyl group (-COOH) at one end. They can exist in different forms, but their most common structure is a linear, unbranched chain of carbon atoms with hydrogen atoms attached to most of the carbons.

The carboxyl group at the end of the chain is polar and hydrophilic (water-loving), while the hydrocarbon chain is nonpolar and hydrophobic (water-fearing). This makes fatty acids amphipathic, meaning they have both hydrophilic and hydrophobic properties.

Fatty acids are the building blocks of many lipids, including fats, oils, and phospholipids. They play important roles in energy storage, membrane structure, and cellular signaling.

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Explanation:

Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.