What are two commonly used types of electron microscopes?
explain

Answer:

The items that would likely scorch or catch fire if left unattended on a stove at 350°F/177°C are:

- Olive Oil

- Safflower Oil

- Sugar (sucrose)

Olive oil and safflower oil have low smoke points and can easily reach their smoke point at 350°F/177°C, leading to scorching or potential ignition.

Sugar (sucrose) can also undergo caramelization and eventually catch fire at high temperatures.

Table salt and ovalbumin (egg protein) do not typically scorch or catch fire at these temperatures.

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To answer if a salt is formed between the reaction of a base and an acid, we need to remember that, if we react a strong acid and a strong base, such as HCl and NaOH, two products will be formed: the appropriate salt and water.

In the example above, we can write the reaction as:

HCl + NaOH -> NaCl + H2O

where a strong acid and a strong base react to form a salt (NaCl) and water (H2O).

Thus, we can say that, yes, a salt is formed when an acid and a base react between each other.

167.273 * 10^23 many water bottles could be filled by a mole of water molecules.

The Avogadro's number is the number of particles (molecules or atoms or ions or even photons) that are contained in one mole of a substance. It is equal to \($6.023 \times 10^{23}$\)particles per mole.

1ml=1gm

So, 500ml = 500gm

Weight of one mole water = 18 gm

Hence, 500gm =(500/18) moles = 27.777 moles

Now, 1 mole contains 6.022 * 10^23( Avogadro's Number) molecules.

Thus, 27.77 moles =( 6.022*10^23 )*(27.77)

which equals 167.273 * 10^23 molecules.

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Answer:

B!

Explanation:

Answer:

i know im late but i just really want the points. the answer is b.

Explanation:

You would need to perform 15 dilutions in a 1:1 ratio to prepare a 62.5 mM solution from a 1 M stock solution.

To prepare a 62.5 mM (millimolar) solution from a stock solution of 1 M (molar), we can use a 1:1 dilution scheme. This means that for each dilution, we will mix equal volumes of the stock solution and the diluent (usually a solvent like water).

To calculate the number of dilutions required, we can use the formula:

Number of Dilutions = (C1 / C2) - 1

Where:

C1 = Initial concentration of the stock solution (1 M)

C2 = Final desired concentration of the solution (62.5 mM)

Plugging in the values:

Number of Dilutions = (1 M / 62.5 mM) - 1

Note that we need to convert mM to M by dividing by 1000 (since 1 mM = 0.001 M).

Number of Dilutions = (1 M / (62.5 mM / 1000)) - 1

= (1 M / 0.0625 M) - 1

= 16 - 1

= 15

Therefore, you would need to perform 15 dilutions in a 1:1 ratio to prepare a 62.5 mM solution from a 1 M stock solution.

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Answer:

ZnBr2

Explanation:

KNO3 + LiOH -------> no reaction

This is because KNO3 and LiOH completely ionize.in water and form neutral solutions.Since both are neutral no reaction occurs

NH4Cl + LiOH -----> NH3 (aq) + H2O (l) + LiCl(aq)

None of the above products are precipitates

Ca(C2H3O2)2 + 2LiOH -----> Ca(OH)2 (aq) + 2LiC2H3O2 (aq)

ZnBr2 + 2LiOH -----> Zn(OH)2 (s) + LiBr2 ( aq)

Zn(OH)2 thus formed is a white precipitate

However when excess LiOH is added Zn(OH)2 precipitate will dissolve to give a clear solution of Li2ZnO2 .

You can remember this by the fact that Na,K,Rb,Cs,Ca,Sr,Ba hydroxides are soluble in water and all other hydroxide are precipitated in water

Zn(OH)2 (s) + 2 LiOH ------> Li2ZnO2(aq) + 2 H2O ( l)

The only compound that will form a precipitate with LiOH would be ZnBr2

These are double displacement reactions in which precipitates are produced. Precipitates are insoluble solids formed from the combination of ions in aqueous solutions.

In this case, a reaction between LiOH and ZnBr2 would be as follows;

2LiOH + ZnBr2 ----------> 2LiBr + Zn(OH)2 (s)

Zn(OH)2 is an insoluble salt and will precipitate out in the solution.

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Answer:

See explanation

Explanation:

Period 3 elements include; Na, Mg, Al, Si, P,S,Cl and Ar

Across the period, the chlorides of the elements change from solid to gas. The chlorides of metals are solid while the chlorides of non metals are gaseous.

Also, the chlorides become more volatile across the period. The formulas of the chlorides change from MCl to MCl2 to MCl3 to MCl4, MCl5 and MCl6 respectively across the period where M is a period 3 element.

The pH of the solutions of chlorides of period 3 elements change from neutral to acidic across the period. The pH of the chlorides of metals are neutral while the chlorides of the nonmetals usually yield acid solutions.

Answer:

30

Explanation:

I’m pretty sure it is

Answer:

Phosphorus

Explanation:

Actually that's red Phosphorus

Answer:

Option B. ( Phosphorus)

Explanation:

Here, we want to select the option which is the main component present in the striking surface of a matchbox

The correct choice here is phosphorus

Red phosphorus which is an allotrope of phosphorus finds use in this particular case. It is the main chemical component present in the striking surface of a matchbox.

Hope this helps!

If you have any queries please ask.

Answer:

Decreased amounts of carbon dioxide cause reactions to happen in the water that increase the pH and decrease the

amount of calcium carbonate

Explanation:

When carbon dioxide is absorbed by seawater, chemical reactions occur that reduce seawater pH, carbonate ion concentration, and saturation states of biologically important calcium carbonate minerals. These chemical reactions are termed "ocean acidification" or "OA" for short.

Answer: Its C I did my research and that's what makes sense to me. because increased amount of carbon dioxide decreases the PH and the amount of calcium carbonate.

Water-washed transmission of infection refers to the spread of infectious agents through direct contact with contaminated water.

Water-washed transmission of infection occurs when individuals come into contact with water that is contaminated with infectious agents, such as bacteria, viruses, or parasites. This can happen through activities like bathing, washing hands, or consuming contaminated water. The infectious agents can enter the body through the respiratory tract, eyes, or open wounds, leading to infection.

Water-washed infections are commonly associated with poor sanitation and lack of access to clean water. Contaminated water sources, inadequate hygiene practices, and unsanitary conditions contribute to the transmission of diseases like diarrhea, cholera, and skin infections.

Preventing water-washed transmission requires ensuring access to clean and safe water sources, promoting proper hygiene practices such as handwashing with clean water and soap, and improving sanitation infrastructure. These measures are crucial for reducing the burden of water-related infections and protecting public health.

In summary, water-washed transmission of infection occurs when individuals come into contact with contaminated water, leading to the spread of infectious agents. Addressing issues related to water quality and sanitation is essential for preventing and controlling water-washed infections.

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Answer: \(K_p=\frac{1}{[p_{Cl_2}]^6}\)

Explanation:

Equilibrium constant is defined as the ratio of pressure of products to the pressuure of reactants each raised to the power their stoichiometric ratios. It is expressed as \(K_p\)  

For the given chemical reaction:

\(P_4(s)+6Cl_2(g)\rightarrow 4PCl_3(l)\)

The expression for \(K_p\) in terms of gaseous is written as:

\(K_p=\frac{1}{[p_{Cl_2}]^6}\)

The relative humidity is 100 (without the % symbol).

Humidity refers to the amount of moisture or water vapor present in the air. It is a measure of the moisture content in the atmosphere.

If 1 kg of 41oF air contains 2 grams of water, the air is unsaturated. This means that the air has not reached its maximum capacity to hold water vapor at that particular temperature.

If 1 kg of 14oF air contains 2 grams of water, the air is saturated. At 14oF, the air has reached its maximum capacity to hold water vapor, and any additional moisture would result in condensation.

The actual amount of water vapor in the air, measured in g/kg, is called water vapor content. It represents the mass of water vapor present in the air per kilogram of dry air.

The formula for relative humidity is:

Relative humidity = (Water vapor content / Saturation mixing ratio) x 100

Using the values given:

Relative humidity = (10 g/kg / 10 g/kg) x 100

Relative humidity = 100

Therefore, the relative humidity is 100 (without the % symbol).

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Answer:

A and D

Explanation:

I took the test, and choose both B and C and got it wrong

Answer:

C.  The moon revolves around the Earth and the Earth revolves around the Sun.

Explanation:

The Earth rotates on its axis and it takes 24 hours to do that. The Earth revolves/orbits the Sun and it takes the Earth about 365 days (a year) to do so. The moon revolves round the Earth. It takes the moon about 27.3 days (on average)  to orbit the Earth.

The Earth's rotation on its axis which takes 24 hours to rotate is actually what causes day and night. The path of the Earth around the Sun is called its orbit.

Therefore, the above statement is true.

The salt CaCl2 (calcium chloride) and water (H2O) are formed in this reaction. Also formed is the gas carbon dioxide (CO2) which may cause a bloated feeling in the stomach. The acid that is secreted in your stomach is approximately 0.1 M (moles per liter) hydrochloric acid.

I hope it helps ●~●

Answer:

It absorbs the sunlight and gets heated instantly because of the mocelcules in a metal object.

Explanation:

B. They are vibrating slightly

Explanation:

This is because the particles are really close together and they vibrate on the spot.

Hope this is useful

Answer:

Compound

Explanation:

Consisting mostly of sugar dissolved in water (corn syrup), and having the same concentration of solute throughout, it would be classified as homogeneous. Are compounds heterogeneous or homogeneous?

Cough syrup is a mixture as more than one compound is used in it. It is a homogenous mixture.

A mixture is a material made up of two or more different chemical substances which are not chemically bonded. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.

A mixture can be homogenous mixture or heterogenous mixture. Homogenous mixture is a mixture in which there are more that one components but we can't distinghuish them with our eye whereas heterogenous mixture is a mixture in which there are more that one components and we can distinghuish them with our eye.

Traditional cough mixtures are formulated around a syrup at 60 - 75% concentration which is made from sucrose, maltodextrin, glucose, invert syrup, etc. The remainder is made up of thickening agents, stabilizers and active ingredients.

Therefore, Cough syrup is a mixture as more than one compound is used in it. It is a homogenous mixture.

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The major product formed upon treatment of (R) 2-bromohexane with sodium cyanide is (S) 2-cyanohexane. The correct option is b.

When (R) 2-bromohexane is treated with sodium cyanide (NaCN), a nucleophilic substitution reaction takes place. The nucleophile, cyanide ion (CN⁻), attacks the electrophilic carbon of the bromoalkane, resulting in the replacement of the bromine atom with a cyanide group.

Since the starting compound, (R) 2-bromohexane, has a chirality center at the second carbon atom, the reaction proceeds with inversion of configuration due to the nucleophilic attack at the backside of the molecule. As a result, the major product formed is the (S) enantiomer of 2-cyanohexane.

The reason for this inversion of configuration is due to the SN2 (substitution nucleophilic bimolecular) mechanism, where the nucleophile attacks the carbon atom bearing the leaving group from the opposite side, leading to a complete reversal of stereochemistry.

Therefore, the correct answer is b. (S) 2-cyanohexane, which represents the major product obtained from the reaction between (R) 2-bromohexane and sodium cyanide.

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The molecular formula of a compound refers to the actual number of atoms of each element present in a molecule of that compound. The empirical formula, on the other hand, provides the simplest whole-number ratio of atoms in a compound. In this case, the empirical formula of the compound is C3H5O2. To determine the molecular formula, we need to know the molar mass of the compound.

We can calculate the molecular formula by finding the ratio of the molar mass of the compound to the molar mass of the empirical formula. The molar mass of the empirical formula C3H5O2 is:

(3 x 12.01 g/mol for C) + (5 x 1.01 g/mol for H) + (2 x 16.00 g/mol for O) = 73.08 g/mol

To find the molecular formula, we divide the molar mass of the compound (146 g/mol) by the molar mass of the empirical formula (73.08 g/mol):

146 g/mol ÷ 73.08 g/mol = 2

This tells us that the compound has two times the number of atoms in the empirical formula. Therefore, the molecular formula of the compound is:

(C3H5O2)2 = C6H10O4

So, the molecular formula of the compound with a molar mass of 146 g/mol and an empirical formula of C3H5O2 is C6H10O4.

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Answer: there are atoms that either have too many or too few neutrons or protons in their nuclei. This results in an imbalance between the jedi forces holding them together, which leads to an excess of internal energy. Such atoms are said to be unstable or radioactive.

Explanation:

Answer:

D) Temperature,

Explanation:

This question is incomplete, here´s the complete question.  

How does the percentage of monounsaturated and polyunsaturated fatty acids in olive oil compare to that of canola oil? Match the words in the left column to the appropriate blanks in the sentences on the right.

Olive oil has about ____ monounsaturated fats, while canola oil has about ___.

Olive oil has about ___ polyunsaturated fats, while canola oil has about ___.

6%

10%

30%

84%

5%

65%

Answer:

Olive oil has about 84% monounsaturated fats, while canola oil has about 65%.

Olive oil has about 5% polyunsaturated fats, while canola oil has about 30%.

Explanation:

Olive and canola oil are the major sources of monounsaturated fatty acids. Although vegetable oils usually have high concentrations of polyunsaturated fatty acids and less monounsaturated fats, olive and canola oils have comparatively less polyunsaturated fatty acids, and more monounsaturated fatty acids.

The Correct answer is 50 Meters,Displacement is defined to be the change in position of an object.

Displacement is the term used to describe the shift in an object's location or the shortest path/length between two places. With such a magnitude and orientation, it is a vector quantity.

Displacement=Δx=x f −x 0

The student's path fortunately consisted of straight lines and right angles. Therefore we can use the pythagorean theorem to find the distance between where the student's path started and stopped.

A2+B2= C2.

We Give

meters east in for A, 40.

meters north for B  60 .

Distance =40+60+20=110m

Displacement OC= Root of (40 ²+30 ²)

                            = 50 m

That's the length of the distance between where the student started and where the student ended up.

A2 plus B2 equals C2. We plug 30. meters east in for A, and 40. meters north for B. 30. meters squared plus 40. meters squared equals 2500 meters2. Then we take the square root of that number and get 50. meters.

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The genes of the cells that get passed on to the offspring is the genes in the Somatic cells

Somatic Cells

Somatic cells are diploid which means, they carry two set of chromosomes from the parents and these chromosomes are produced during mating. It is a cell that consist of blood cells, muscle cells, skin cells and nerve cells. It is also called vegetal cells.

All cells in the body aside reproductive cells is somatic cells. Somatic cells contain DNA arranged in chromosomes. The cells divide through the process of binary fission and mitotic division. Somatic cells can multiply and maintain the same genetic information, but only a limited number of times.

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Answer:

6 gallons of gasoline for $14.45 is the best price

Explanation:

26.29/11=2.39 $ per gallon

14.45/11=1.31 $ per gallon

The highest oxidation state for Nb (niobium) is +5.

Oxidation is the loss of electrons in a chemical reaction. For the element niobium (Nb), the highest oxidation state is +5. This is because niobium has five valence electrons in its outermost shell, which it can lose to form a +5 oxidation state.

This is commonly seen in compounds such as Nb₂O₅ (niobium pentoxide) and NbF₅ (niobium pentafluoride). That being said, it is important to note that niobium can also form lower oxidation states, such as oxidation state +3 and +4. However, the +5 state is the highest possible for niobium.

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Answer:

0.87atm

Explanation:

Given parameters:

Pressure of the gas  = 1.1atm

Initial temperature  = 20.6°C  = 20.6 + 273  = 293.6K

Initial volume  = 19.2L

New volume  = 24.3L

Unknown:

New pressure  = ?

Solution:

To solve this problem, we apply the Boyle's law equation:

      P1V1  = P2V2

P and V are pressure and volume

1 and 2 are the initial and new states

        1.1 x 19.2  = P2 x 24.3

             P2  = 0.87atm