Rank from smallest to largest

Answer:

Explanation:

Pressure and volume are indirectly related.

Pressure and temperature are directly related.

so first ? is increase

2nd ? is decrease

Answer: Ba + Co(CN)₃ → Ba(CN)₂ + Co₂O₃

Explanation:

Barium reacts with cobalt (III) cyanide to produce barium cyanide and cobalt (III) oxide according to the following chemical equation:

Ba + Co(CN)₃ → Ba(CN)₂ + Co₂O₃

It is a type of displacement reaction.

Answer:

a) 320: two significant figures.

b) 2,366: four significant figures.

c) 73.0: three significant figures.

d. 532.5: four significant figures.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to write each number by knowing we move the decimal places to the right as much as the exponent is, and also, we count every figure, even zeros, because they are to the right of the first nonzero digit:

a) 320: two significant figures because the rightmost zero is not preceded o followed by a decimal place.

b) 2,366: four significant figures.

c) 73.0: three significant figures, because the zero is followed by the decimal place.

d. 532.5: four significant figures.

Regards!

Answer: The %w/w protein in the sample is 15.2 %

Explanation:

To calculate the number of moles for given molarity, we use the equation:

\(\text{Moles of solute}={\text{Molarity of the solution}}\times{\text{Volume of solution (in L)}}\)    

\(\text{Moles of} HCl={0.09552\times 50.00}{1000}=0.0047moles\)

\(\text{Moles of} NaOH={0.05992\times 37.84}{1000}=0.0023moles\)

\(HCl+NaOH\rightarrow NaCl+H_2O\)  

According to stoichiometry :

1 mole of \(NaOH\) require 1 mole of \(HCl\)

Thus 0.0023 moles of \(NaOH\) will require=\(\frac{1}{1}\times 0.0023=0.0023moles\)  of \(HCl\)

moles of HCl used = (0.0047-0.0023) = 0.0024

\(NH_3+HCl\rightarrow NH_4Cl\)

1 mole of HCl uses = 1 mole of ammonia

Thus 0.0024 moles uses = \(\frac{1}{1}\times 0.0024=0.0024moles\) of ammonia

Mass of ammonia= \(moles\times {\text {Molar mass}}=0.0024\times 17g/mol=0.0408g\)

17 g of ammonia contains = 14 g of Nitrogen

Thus 0.0408 g of ammonia contains = \(\frac{14}{17}\times 0.0408=0.034 g\) of Nitrogen

Now 17.45 g of Nitrogen is present in = 100 g of protein

Thus 0.034 g of Nitrogen is present in =\(\frac{100}{17.45}\times 0.034=0.195g\) of protein

Now % w/w of protein = \(\frac{0.195}{1.2846}\times 100=15.2\%\)

Thus %w/w protein in the sample is 15.2%

If the proteins in grains average 17.54% w/w N, the % w/w protein in the sample is 15.2 %.

It is a process of converting nitrogen present in any compound into ammonium sulfate.

Step1: calculating the moles by the formula of molarity

molarity × volume

M = 0.09552, V =  50.00 mL =0.05 L

Moles of HCl

\(0.09552 \times 0.05 = 0.0047\;mol\\\)

Moles of NaOH

\(0.05992 \times 0.03784 = 0.0023 \;mol\)

Moles of HCl used is  0.0047 - 0.0023 = 0.0024

Step2: calculating the mass of ammonia

moles × molar mass

\(0.024 \times 17\;g/mol = 0.0408\;g\)

Now, 17 grams of ammonia have 14 grams of nitrogen

so, 0.0408 g ammonia have \(\dfrac{14}{17} \times 0.0408 = 0.034\)

In 100 g of protein, there is 17.45 g of nitrogen

So, 0.034 g N have \(\dfrac{100}{17.45} \times 0.034 = 0.195 g.\\\)

Step3: calculating the % w/w

\(\dfrac{0.195}{1.2846} \times 100 = 15.2 \%\)

Thus, the % w/w is 15.2 %

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The mass of carbon dioxide produced by the complete combustion of 48.0g of hexane is 147.35g.

The mass of a substance can be calculated by using the stoichiometry approach.

The balanced equation of the complete combustion of hexane is as follows:

2C6H14(g) + 19O2(g) → 12CO2(g) + 14H2O(g)

48g of hexane to moles is calculated as:

48g ÷ 86g/mol = 0.56 mol

2 moles of hexane produces 12 moles of CO2

0.56 mol of hexane will produce 0.56 × 12/2 = 3.35 mol

Next, we convert 3.35 moles of CO2 to mass as follows:

3.35 moles × 44g/mol = 147.35g

Therefore, the mass of carbon dioxide produced by the complete combustion of 48.0g of hexane is 147.35g.

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Answer:

hmmm

Explanation:

Cycloalkanes (n=3, 4, 5):

Cyclopropane (C3H6)

Cyclobutane (C4H8)

Cyclopentane (C5H10)

Alkenes (n=3, 4, 5):

Propene (C3H6)

Butene (C4H8)

Pentene (C5H10)

Cycloalkanes are a type of organic compounds that contain a closed ring of carbon atoms. The carbon atoms in the ring are bonded to each other with single covalent bonds. Cycloalkanes are saturated hydrocarbons because they have the maximum number of hydrogen atoms that can be bonded to each carbon atom. The simplest cycloalkane is cyclopropane, which has three carbon atoms in the ring. Other examples include cyclobutane, cyclopentane, cyclohexane, and so on.

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Answer:

d) The object falls towards the ground

Explanation:

Answer:CH

3

​

CH

2

​

CH

2

​

C≡C−CH

3

​

Explanation:

Answer:

a liquid

Explanation:

Answer:

90.6666g

Explanation:

convert 85g to moles gives you 2.83333moles

since CO:O ratios is 1:2 therefore moles of O2 is 5.66666moles

converting O2 moles to grams gives you 90.666666g

The rate of appearance of NOBr at the given time is 9.80 × \(10^-^4\) M/s which is the second option as the question asks to determine the rate of appearance of NOBr, which is a product of the given chemical reaction, at the given time when the rate of disappearance of Br₂ is known. 

For every 1 mole of Br₂ that disappears, 2 moles of NOBr appear. Thus, we can set up a proportion:

(2 mol NOBr / 1 mol Br₂) = (rate of appearance of NOBr / rate of disappearance of Br₂)

Substituting the given values,

(2 mol NOBr / 1 mol Br₂) = (rate of appearance of NOBr / 4.90 x  \(10^-^4\) M/s)

Solving for the rate of appearance of NOBr,

rate of appearance of NOBr = (2 mol NOBr / 1 mol Br₂) x (4.90 x  \(10^-^4\) M/s) = 9.80 ×  \(10^-^4\)M/s

The rate of appearance of NOBr at the given time is 9.80 × \(10^-^4\) M/s.

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Although the data for the experiment was not provided, we can offer a generalized answer in that when performing an experiment to achieve absolute zero temperatures, the value will never match the exact value.

Absolute zero is the lower limit of temperature. It is considered the coldest possible temperature that can exist. However, any attempt to reach this temperature in a controlled environment has failed, scientists do not think it is possible to recreate this temperature.

Therefore, we can confirm that the value of the absolute zero experiments did not match the accepted value. If the hypothesis was that it would be difficult or impossible to achieve, then the data would support the hypothesis, otherwise, it would fail to do so.

In summary, absolute zero is a temperature that cannot be recreated in a lab, so the value in this experiment does not match the accepted value and there is no further exploration to be done on this matter.

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Answer:

Store the genetic instructions needed to specify traits.

In DNA, the primary function of chromosome is store the genetic instructions needed to specify traits.

DNA is a hereditary material  which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate  sugar are together called as nucleotides.

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Answer:these remove the nitrate from. The water - plants

These produce waste that contains ammonia- fish

These convert ammonia into nitrate-bacteria

Explanation:

Plants remove the nitrate from the water, fishes produce waste that contains ammonia, and bacteria convert ammonia into nitrate.

An aquaponics system is a sustainable method of agriculture that combines aquaculture with hydroponics. In this system, fish or other aquatic animals are kept in a tank or pond. The fish produce waste in the form of ammonia-rich water.

This wastewater is then circulated to the hydroponic component of the system, where plants are grown in a soil-less medium or directly in water. Beneficial bacteria in the system convert ammonia into nitrites and then nitrates, which are essential nutrients for plants.

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According to the stoichiometry of the given balanced chemical equation, 18.02 g of water are required for 1 mole of methane and 2 moles of water.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given chemical equation 1 mole of methane gives 2 moles of water, that is,  16 g methane gives 36 g water, thus, 8.22 g will give 8.22×36/16= 18.02 g of water are required.

Thus, 18.02 g of water are required for 1 mole of methane and 2 moles of water.

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Answer:

First part- As the water moves upward along the filter paper strip, the different pigments present in the black ink separate out as different points. After drying the paper, there is a colored pattern on the strip.

Second part- Black ink is made up of different colored pigments, and chromatography separates it into its constituent components.

Explanation:

Plato

Chromatography is the separation used for the mixtures in a substance. After 2-3 hours, the ink starts moving with the mobile phase resulting in the separation of the different colored components of the ink.

Chromatography has been the analytical technique for mixture separation. When the ink on the strip is kept in contact with a mobile phase like liquids and water then after some time it has been noted that different colors of the ink start moving with the solvent.

This separation of the ink components can conclude that black ink is made by mixing various colored pigments that have their own retention factors that get separated when kept along the solvent or the mobile phase.

Therefore, ink chromatography is a separation technique of the mixtures.

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Answer:

Convection Currents

Explanation:

Answer:

True

Explanation:

This is because, The hydroboration oxidation of an alkene which is isobutene in the presence of a catalyst will result to alcohol as the product . Therefore, the OH group will attach or link itself to the carbon which is less obstructed. Thus this reaction is in accordance to Anti-Markownikoff's rule.

So isobutene on hydroboration oxidation will produce ter isobutyl alcohol.

Answer:

Answer is shown on the paper :D

Explanation:

Remember to follow sig-figs.

1) Note that Tectonic plate interactions cause geological events. Convection currents in the Earth's mantle drive plate movements and create divergent, convergent, and transform boundaries. The movement creates earthquakes, volcanic eruptions, and mountain formations. The type of boundary determines the type of geological event that occurs.

2) One example of a geological event caused by tectonic plate interactions is the Pacific Ring of Fire. The Ring of Fire is a string of active volcanoes and seismic activity that encircles the Pacific Ocean.

Geological events are natural occurrences that result from the movements and interactions of tectonic plates, driven by convection currents in the Earth's mantle.

These events include earthquakes, volcanic eruptions, and mountain building and can have significant impacts on the Earth's surface and its inhabitants. Some examples of geological events include volcanic eruptions, earthquakes, tsunamis, and mountain building.

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1.785714286 moles

The number of moles (n) for nitrogen is: [ n=50.0÷28.0 ] = 1.785714286 moles.

The velocity of the Rock is 34.5 m/s.

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Answer:

The mass of sucrose in grams required to make  7% weight volume in 100 mL solution of water is 7g

Explanation:

The percentage weight of a solution is mostly referred to as percentage weight per volume (% w/v). The formula for this is

% w/v = g of solute/100 mL of solvent

sucrose is the solute here while water is the solvent. The mass (in grams) of the solute is the unknown

7% = g of solute/100 mL of water

where 7% equals/the same with 7/100;

7/100 = g of solute/100 mL of water

g of solute = 7 × 100/100

g of solute = 7 g

The mass of sucrose in grams required to make  7% weight volume in 100 mL solution of water is 7g

Magnesium parts are typically attached using mechanical fasteners.

A tool used to mechanically attach (or fasten) two or more things together is known as a mechanical fastener. Although there are many distinct kinds of mechanical fasteners, they can generally be split into two groups: permanent and non-permanent fastening.

There are many different kinds of mechanical fasteners, such as screws, nails, nuts, bolts, washers, anchors, and rivets.

Since World War II, magnesium sheet has been utilized in the transportation sector as a structural material.

For the purpose of attaching magnesium components to various metal substrates, upset protrusion joining was created. Cast and wrought alloys are the two primary divisions of magnesium alloys. Cast alloys made of magnesium are the most common use. Many industries use parts and components made of magnesium and magnesium alloys.

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The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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The absorbance of a sample of the solution is 0.74, which is equivalent to the molar absorptivity of the Co2+(aq) solution, which is 4.48 x 10⁴ L/mol-cm.

Moles are small, burrowing mammals found throughout much of the world. They have a cylindrical body, covered in short, velvety fur, and stocky legs. They have a rounded snout and small eyes, and their fur is usually black, brown, or gray. Moles feed mainly on earthworms, insects, and grubs, and use their powerful front paws to dig extensive tunnel systems in gardens and lawns. Moles are solitary creatures, living and foraging alone, and they are active both day and night.

This can be used to calculate the [Co2+] in the solution.

[Co2+] = Absorbance / (Molar absorptivity x Sample path length)

[Co2+] = 0.74 / (4.48 x 10^4 L/mol-cm x 0.0500 L)

[Co2+] = 0.0164 M

The number of moles of Co2+(aq) in the 50.00 mL solution can be calculated using the following equation:

Moles Co2+ = [Co2+] x Volume

Moles Co2+ = 0.0164 M x 0.050 L

Moles Co2+ = 8.20 x 10⁻³ mol Co2+

The mass percent of Co in the 0.630 g sample of the ore can be calculated using the following equation:

Mass percent Co = (Mass of Co2+ x 100) / Mass of sample

Mass percent Co = (8.20 x 10⁻³mol Co2+ x 58.93 g/mol Co2+) / 0.630 g

Mass percent Co = 5.04%

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Answer:

D The number of protons

Based on the heat of reaction, if 123 kJ of heat is evolved when the reaction described below is carried out, the mass of HCl gas (36.46 g/mol) produced is 23.6 g.

The heat of a reaction is the amount of heat energy given off or absorbed in the reaction.

During a reaction, energy changes occur as a result of the breaking of bonds in the reactants as well as the formation of bonds in the products.

The sum of the overall energy change that accompanies the formation of products from the reactants gives the heat change of a reaction.

Considering the heat change of the given reaction below:

3 Cl₂ (g) + PH₃ (g) → PCl₃ (g) + 3 HCl (g)     ∆H = - 570.4 kJ

The formation of 3 moles of HCl results in the evolution of 570.4 kJ of heat.

If 123 kJ of heat are evolved, then the moles of HCl produced will be:

Moles of HCl produced = 123 kJ * 3 moles / 570.4 kJ

Moles of HCl produced =  0.647 moles

Mass of HCl produced = 0.647 * 36.46

Mass of HCl produced = 23.6 g

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