when treated with sodium borohydride, d-glucose is converted into an alditol.T/F

#O_2

\(\\ \sf\longmapsto No\:of\;moles=\dfrac{Given\:mass}{Molar\:mass}\)

\(\\ \sf\longmapsto No\:of\:moles=\dfrac{31.99}{32}\)

\(\\ \sf\longmapsto No\:of\:moles\approx 1\)

#NaCl

\(\\ \sf\longmapsto No\:of\:moles=\dfrac{176.8}{58.5}\)

\(\\ \sf\longmapsto No\;of\:moles=3mol\)

Answer:

0.78× 10 ²³ molecules

Explanation:

Given data:

Mass of pyridine = 10.35 g

Number of molecules = ?

Solution:

Number of moles of pyridine:

Number of moles = mass/molar mass

Number of moles = 10.35 g/ 79.1 g/mol

Number of moles = 0.13 mol

Number of molecules;

1 mole contain 6.022× 10 ²³ molecules

0.13 mol × 6.022× 10 ²³ molecules / 1mol

0.78× 10 ²³ molecules

In the procedure, step 3(a) states that washing the precipitate is necessary. The reason for washing the precipitate with hot water is that it removes any remaining impurities and unreacted chemicals.

Washing the precipitate helps to purify it and remove unwanted particles. Hot water is used because it can dissolve impurities and wash them away more effectively than cold water. Additionally, the hot water can increase the rate of precipitation, making the process faster. If the precipitate is not washed properly, it can have a negative effect on the final product. The washing process ensures that the precipitate is pure and ready for further use. Overall, washing the precipitate is a crucial step in the procedure to ensure the purity and quality of the final product.

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Answer: the cell wall is the skeletal system

The nucleus is the brain

The mitochondria is the digestive system

The cell membrane is the skin

Explanation:

Answer:

graphite

Explanation:

graphite is also good conductor of electricity

We can use the following formula to determine the amount of food colouring present in a standard solution: C1V1 = C2V2. As a result, the final standard solution's food colouring concentration is 0.02676% (v/v).

A homogeneous mixture of two or more substances, in which the solute is uniformly dispersed in the solvent, is referred to as a solution. Solutions exist in a variety of forms, including gases, liquids, and solids. They are crucial in a number of disciplines, such as chemistry, medicine, and technology. To create a solution, one must correctly measure the amounts of the solute and solvent and then completely combine them to create a homogeneous mixture. A solution's concentration can be stated in a number of ways, including molarity, molality, and percent by mass or volume. Solutions can differ from their component elements and compounds in terms of their boiling and melting points, as well as their appearance, flavour, and odour.

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The mass of the piece of cork is determined by its density, which can vary depending on the specific type of cork.

To calculate the mass of the piece of cork, we need to know its density. Density is defined as the mass per unit volume of a substance. However, the question only provides the volume of the cork, which is 35.5 milliliters (ml). Without the density, we cannot directly determine the mass.

To find the mass, we need to multiply the volume by the density of the cork. Density is typically expressed in grams per milliliter (g/ml) or grams per cubic centimeter (g/cm³). Once we have the density, we can use the formula:

Mass (g) = Volume (ml) x Density (g/ml)

Without information about the density of the cork, we cannot accurately calculate its mass. Therefore, we need additional data or specifications to proceed with the calculation.

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The amount of heat gained by the water is 500 calories. Thus, option D is correct.

Given:

Mass of water (m) = 100 g

Change in temperature (ΔT) = 30°C - 25°C = 5°C

The specific heat capacity of water (c) is approximately 1 calorie/gram°C.

Now, the amount of heat gained by the water,

Q = mcΔT

Where:

Q is the heat gained or lost by the substance

m is the mass of the substance

c is the specific heat capacity of the substance

ΔT is the change in temperature

Plugging in the values into the formula:

Q = 100 × 1 × 5

Q = 500 calories

Therefore, the amount of heat gained by the water is 500 calories.

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Answer:

This could be guanidinopropionate.  A drawing of the structure is attached.

Explanation:

There are other possible structures with this formula.  The one shown in the attached diagram is one possibility.  It is named, unfortunately, guanidinopropionate.  

Answer:

Limiting reactant: lead(II) nitrate (Pb(NO3)2).

Mass of sodium nitrate (NaNO3) = 12.92 g.

Explanation:

What is given?

Mass of lead (II) nitrate (Pb(NO3)2) = 25 g.

Mass of sodium iodide (NaI) = 30 g.

Molar mass of Pb(NO3)2 = 331 g/mol.

Molar mass of NaI = 150 g/mol.

Molar mass of sodium nitrate (NaNO3) = 85 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation. Lead (II) nitrate (Pb(NO3)2) reacts with sodium iodide (NaI) in a double-replacement reaction to produce sodium nitrate (NaNO3), and PbI2:

Now, let's calculate the number of moles of each reactant using its molar mass. The conversion from grams to moles for Pb(NO3)2 will look like this:

And for NaI:

The next step is to see how many moles of NaNO3 are being produced. We're going to need the chemical equation: let's start with Pb(NO3)2. 1 mol of Pb(NO3)2 reacted produces 2 moles of NaNO3, so we will obtain:

And now, let's see that 2 moles of NaI reacted produce 2 moles of NaNO3, so the molar ratio between these compounds is 1:1, which means that 0.20 moles of NaI reacted will produce 0.20 moles of NaNO3 too:

Based on these calculations, you can note that the limiting reactant would be Pb(NO3)2 because this compound imposes the limit because is being consumed first, it is producing the maximum amount of NaNO3 that we can produce in this reaction.

The final step is to calculate the mass of NaNO3 that is being produced. Remember as Pb(NO3)2 is the limiting reactant and it produces 0.152 moles of NaNO3, we use this data to find the mass of NaNO3 using its given molar mass too, like this:

The answer is that the limiting reactant is lead (II) nitrate (Pb(NO3)2) and we're producing 12.92 g of sodium nitrate (NaNO3).

Answer:

B.  use a new pair of gloves for each piece of evidence

Explanation:

When it comes to the basic precautions of handling biological evidence samples, one has to prevent cross contamination. This refers to the transfer of DNA from one evidence to another evidence; thus, it is important for Jane to use a new pair of gloves for each piece of evidence in order to prevent such occurrence.

Wearing of gloves will also prevent Jane's DNA from being implanted into the sample, and it will keep her safe from contracting blood-borne pathogens like those in the saliva, blood or semen.

Answer:

The answer is Radiocarbon

Explanation:

IM PRETTY SURE IT IS D !! IF ITS WRONG IM SORRY THAT WHAT

I GOT

When hydrochloric acid (HCl) is passed through a saturated solution of common salt (NaCl), a precipitate of sodium chloride (NaCl) will form.

This reaction occurs due to a chemical reaction between the hydrochloric acid and the sodium chloride in the solution. Hydrochloric acid is a strong acid that dissociates into hydrogen ions (H+) and chloride ions (Cl-) in water. When it is added to a saturated solution of common salt, which already contains dissolved sodium ions (Na+) and chloride ions (Cl-), a precipitation reaction takes place. The hydrogen ions from the acid combine with the chloride ions from the salt solution to form hydrochloric acid molecules (HCl) again.

The remaining sodium ions and chloride ions in the solution are now in excess, causing the solubility of sodium chloride to be exceeded. As a result, solid sodium chloride particles begin to form and settle as a precipitate in the solution. This precipitation reaction is a common occurrence when mixing hydrochloric acid with a saturated solution of common salt.

The formed precipitate of sodium chloride appears as fine crystals or solid particles, depending on the concentration of the salt solution and the amount of hydrochloric acid added. These particles can be separated from the solution through filtration or other appropriate techniques.

In summary, when hydrochloric acid is passed through a saturated solution of common salt, a precipitate of sodium chloride will form due to the chemical reaction between the acid and the salt solution.

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Indeed, 13C NMR spectroscopy can be used to differentiate between borneol and isoborneol. Because the chemical structures of borneol and isoborneol differ.

A potent analytical method for examining the carbon nuclei in molecules is 13C NMR spectroscopy. It is based on the observation of the resonance frequencies of various carbon atoms within a molecule through the interaction of carbon-13 nuclei with an external magnetic field. The identification, quantification, and structural clarification of a wide variety of organic compounds are made possible by the information that 13C NMR spectra provide about the chemical environment and connectivity of carbon atoms in molecules. It has become a vital instrument for the characterisation of complex mixtures, natural products, and synthesised substances and is frequently utilised in disciplines including chemistry, biochemistry, and pharmacology.

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First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

Answer:

Does the Big Bang theory count?

When silver nitrate (AgNO₃) reacts with sodium iodide (NaI), a precipitate forms. The precipitate that is produced in this reaction is silver iodide (AgI).

The reaction can be represented by the following balanced chemical equation:

2AgNO₃ + 2NaI → 2AgI + 2NaNO₃

In this equation, two moles of silver nitrate react with two moles of sodium iodide to yield two moles of silver iodide and two moles of sodium nitrate.

Silver iodide is a yellow, crystalline solid that is insoluble in water. The formation of a precipitate occurs because silver iodide has low solubility, meaning it does not readily dissolve in water. Instead, it separates out of the solution as a solid, forming a visible precipitate.

The reaction between silver nitrate and sodium iodide is a double displacement reaction. The silver ions (Ag+) from silver nitrate combine with the iodide ions (I-) from sodium iodide to form solid silver iodide (AgI). The sodium and nitrate ions remain in solution as sodium nitrate (NaNO3).

Precipitation reactions are commonly used in chemical analysis to identify the presence of specific ions in a solution. In this case, the formation of the yellow precipitate of silver iodide confirms the presence of iodide ions in the solution.

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A second-order reaction results in the breakdown of substance X. It takes 0.50 0.025 h for just a solution with an initial concentration of 1.00 0.5 M in X to degrade to 0.025 M 0.50M.

Reaction is what?

reaction definition 1 a: the reactionary act, process, or instance b: a power, influence, or activity that is opposed or opposed to especially: propensity for an old, typically obsolete political, social, or policy

What does a response time test entail?

regarding the test. This is a straightforward tool for calculating reaction times. According to the information gathered so far, the response time was 215 milliseconds on average (median). The latency of the computer and screen has an impact on this test in addition to assessing your reaction time.

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Answer:

Endothermic reaction

Explanation:

Endothermic means that energy is absorbed leading to more product.

The reaction in which the products can return back to reactants is called reversible reaction. The reaction where more products are formed is called endothermic  reaction where the products are more stable.

An endothermic reaction is a reaction where, the reactants absorbs heat energy and to produce new products. The term for heat absorption is called endothermic. Whereas the reaction in which heat is evolved is called an exothermic reaction.

In endothermic reaction, reactants gains thermal energy to overcome the  energy barrier for the reaction. Therefore the activation energy for products will also be lower indicates their stability.

The enthalpy change that the change in heat absorbed for the endothermic reaction will be positive that is ΔHrxn is +ve. Endothermic phase change involves an increase in entropy. Hence, the reaction that result in more products than reactants is endothermic.

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Answer:

a chemical change

Explanation:

bubbles formed

Answer:

Explanation:

✔︎A chemical change

✖︎wich is D

 would be ur answer

Explanation:

❐A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. Chemical changes occur through the process of chemical reactions, and the resulting substances have different properties because their atoms and molecules are arranged differently.

CAN I PLZ GET MARK AS THE BRAINLIEST? ")

The reagents/conditions used for the following reaction are: Conc. \(H_2SO_4\), heat: This indicates the use of concentrated sulfuric acid (\(H_2SO_4\)) and heat as the reaction conditions. The heat is typically applied to initiate or speed up the reaction.

NaOH: Sodium hydroxide (NaOH) is a strong base that can be used in various reactions, such as neutralizations or hydrolysis reactions. It is often used in aqueous solutions.

\(H_2O\): Water (\(H_2O\)) is commonly present as a solvent or a reactant in many chemical reactions. It is necessary for the dissolution of certain compounds and can participate in hydrolysis reactions.

Please note that without specific context or reaction equation, it is challenging to determine the exact purpose or outcome of the reaction involving these reagents /conditions. The specific reaction and reactants involved would provide more information for a comprehensive understanding of the reaction.

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The trail making tests evaluate several cognitive skills, including attention, sequencing, and thought processing. The correct option is C.

The trail making tests are considered a measure of executive functioning, which encompasses a range of cognitive processes involved in planning, organizing, and regulating behavior. Specifically, these tests evaluate attention, sequencing, and thought processing. Attention refers to the ability to sustain and focus one's attention on a task, while sequencing refers to the ability to organize information in a logical sequence.

The trail making test is a neuropsychological assessment that measures cognitive functions such as attention, sequencing, and thought processing. It does not directly assess mood, intelligence, or overall intelligence. Instead, it focuses on an individual's ability to connect a sequence of numbers and letters, requiring them to switch between different cognitive processes.

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Answer:

hey mate here is your answer

Biodiversity is a term used to describe the enormous variety of life on Earth. It can be used more specifically to refer to all of the species in one region or ecosystem. Biodiversity refers to every living thing, including plants, bacteria, animals, and humans.

please mark me as a brainliest

Answer:

pure science is the study of nature and its environment while applied science is the acquisition of scientific knowledge from pure science to solve practical problems

Answer:

Neutral. There are equal amounts of protons or positively charged parts and electrons or negatively charged parts. The neutrons have no net charge which means this atom of chlorine is neutral.

Explanation:

Answer:

I think the answer is period 7

Explanation:

The period in periodic table, in which no stable ions of elements exists is 7th period. They contains actinides.

Actinides are 7th period elements classified to F block of periodic table. A periodic table contains vertical columns called groups and horizontal rows called periods.  Each elements are classified into suitable groups based on their similarity in properties with other group elements.

There are four blocks in periodic table which are s, p, d and f block. S block elements are metals and d block contains transition metals and p block have non metals including gases and metalloids.

Actinides are f- block metals. All the elements in the period are radioactive. That's why they don't have a stable isotope or ion. They continuously undergo radioactive decay by the emission of charged particles.

Hence, the period containing unstable elements is 7th one.

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The molarity of the acetic acid solution is 0.96 M, rounded to three decimal places.

It is calculated by dividing the number of moles of acetic acid by the volume of the solution in liters.
First, convert the volume from milliliters to liters by dividing by 1000:
25 ml = 25/1000 L = 0.025 L
Then, divide the number of moles (0.024) by the volume in liters (0.025):
Molarity = 0.024 moles / 0.025 L = 0.96 M

The density of acetic acid is 1.05 g/ml, and its molecular weight is 60 g/mol. Acetic acid CH3COOH (C2H4O2) has a molecular weight of 60 grams. One litre of water and one mole of acetic acid combine to form a molar solution.

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Answer:

Explanation:

Because your brain and the TV are programed to do certain things. As if you're going back into a memory, and you're simply rewatching a season of Beyblade: Metal Fusion on the TV.

Answer:

Explanation:

The intermolecular forces are stronger in Iodine, meaning that its molecules are stronger and can hold that solid structure at room temperature, where Bromine cannot due to its IMF's being weaker.