An excess of a divalent metal M was dissolved in a limited volume of hydrocloric acid. If 576cm³ of hydrogen was librated at s.t.p , what was the mass of metal that produced this volume of gydrogen?( M = 24, H = 1 , molar volume of gas at s.t.p = 22.4dm³)​

Answer:

D. Burning a peice of wood

Explanation:

Because when you burn wood a chemical reaction happenes between the flames and the wood making the wood into ashes.

Hope this helps you :)

The dissolving salt in water is an an example of a chemical change. The correct option is A.

A chemical change, also known as a chemical reaction, is the production of new substances with changing chemical compositions and characteristics.

In water, sodium chloride dissociates into Na+ ions and Cl- ions, which may be described as a chemical process.

The ionic connections between the atoms are broken as salt dissolves. Because the reactant (sodium chloride or NaCl) varies from the products (sodium and chloride ions), a chemical reaction takes place.

Thus, the correct option is A.

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Answer:

they r of same weight ...............

Answer:

false

Explanation:

Electrons are a type of subatomic particle with a negative charge. ... Protons and neutrons have approximately the same mass, but they are both much more massive than electrons (approximately 2,000 times as massive as an electron). The positive charge on a proton is equal in magnitude to the negative charge on an electron.

Answer:

n=m/M

n=48/32

n=1.5 moles

the correct answer is B

The organic product in this reaction would be propan-2-one (also known as acetone). This is because the Grignard reagent, which is formed when acetone (CH₃COCH₃) reacts with phenylmagnesium bromide, would be propan-2-ylmagnesium bromide.

Organic products are any food items that are grown without the use of synthetic fertilizers, pesticides, or other artificial substances. This type of food is grown and processed without the use of any artificial chemicals, preservatives, or other unnatural elements. Organic products are typically grown in an environment that is free from chemical inputs and is rich in natural minerals and nutrients. Organic products are typically found to be higher in vitamins and minerals, as well as significantly lower in toxins and other contaminants when compared to non-organic foods. Organic products are also typically produced in ways that are more sustainable and environmentally friendly than conventional farming methods. Organic products are a great way to ensure that you are putting the most nutritious and healthy food in your body.

Upon hydrolysis of the magnesium complex, this would produce propan-2-one (CH₃COCH₃) as the organic product.

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When considering the commercial production and marketing of apples , several factors like pre-harvest factors, harvesting, precooling, packing operations, packaging, storage, transportation, marketing, and retailing.

Pre-harvest factors: These include selecting suitable varieties, managing pests and diseases, providing proper nutrition, irrigation, and maintaining orchard hygiene to ensure healthy and high-quality apple crops.

Harvesting: Harvesting apples at the right time is important to ensure optimal taste and quality. Proper techniques should be employed, such as hand-picking or using mechanical harvesters, and care should be taken to prevent damage to the fruit during harvesting.

Precooling: Apples should be rapidly cooled after harvest to remove field heat and preserve their freshness. This can be done using forced-air cooling or hydrocooling methods to bring down the temperature quickly.

Packing operations: Sorting and grading apples based on size, color, and quality is essential for uniformity and market appeal. Proper packing procedures, including gentle handling and appropriate equipment, should be followed to prevent bruising and maintain fruit quality.

Packaging: Choosing suitable packaging materials and designs that provide protection, ventilation, and visibility of the apples is crucial. Packaging should be attractive, informative, and eco-friendly to attract customers and maintain product integrity.

Storage: Apples require controlled storage conditions to extend their shelf life. Maintaining the right temperature, humidity, and ventilation in storage facilities is essential to prevent spoilage, maintain freshness, and avoid losses.

Transportation: Efficient and timely transportation of apples from the orchard to the market is critical. Proper handling, packaging, and temperature control during transportation help preserve the quality and minimize damage.

Marketing: Developing effective marketing strategies, such as branding, promotion, and pricing, is crucial to reach the target market, create demand, and differentiate the product from competitors. Understanding consumer preferences and market trends is essential for successful marketing.

Retailing: Establishing partnerships with retailers, such as grocery stores or farmers' markets, is important for distribution and sale of apples. Providing attractive displays, product information, and maintaining quality standards at the retail level helps attract customers and ensure repeat business.

By considering these factors and aspects in the production and marketing of apples, producers can enhance the overall success and profitability of their business while delivering high-quality produce to consumers.

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First, we need to balance the chemical equation:Na2CO3 + Ca(OH)2 → 2NaOH + CaCO3Now we can use stoichiometry to find the theoretical yield of NaOH. The balanced equation tells us that 1 mole of Ca(OH)2 produces 2 moles of NaOH. The molar mass of Ca(OH)2 is:40.08 g/mol (Ca) + 2(1.01 g/mol)(H) + 2(16.00 g/mol)(O) = 74.10 g/molSo, 5.6 g of Ca(OH)2 is equal to:5.6 g / 74.10 g/mol = 0.0755 molAccording to the balanced equation, 1 mole of Ca(OH)2 produces 2 moles of NaOH. Therefore, the number of moles of NaOH produced is:2 * 0.0755 mol = 0.151 molFinally, we can convert the number of moles of NaOH to grams using its molar mass:0.151 mol * 40.00 g/mol = 6.04 gRounding to two decimal places, the theoretical yield of NaOH is 6.05 g. Therefore, the answer is option (C) 6.05 g.

Answer:

To determine the theoretical yield of NaOH, we need to use stoichiometry to find the mole ratio between Ca(OH)2 and NaOH in the balanced chemical equation.

The balanced chemical equation is:

Na2CO3 + Ca(OH)2 → 2NaOH + CaCO3

The mole ratio between Ca(OH)2 and NaOH is 1:2, which means that for every 1 mole of Ca(OH)2, 2 moles of NaOH will be produced.

First, we need to convert the given mass of Ca(OH)2 to moles:

5.6 g Ca(OH)2 x (1 mol Ca(OH)2 / 74.09 g Ca(OH)2) = 0.0756 mol Ca(OH)2

Using the mole ratio from the balanced equation, we can calculate the theoretical yield of NaOH:

0.0756 mol Ca(OH)2 x (2 mol NaOH / 1 mol Ca(OH)2) x (40.00 g NaOH / 1 mol NaOH) = 6.05 g NaOH

Therefore, the theoretical yield of NaOH is 6.05 g. The answer is option C.

Answer:

the answer is d.

1. Write the symbols for each element.

2. Find the charge for each element using the Periodic Table. Write it above each element. (because there is a (III) after nickel, the charge of nickel is +3. oxygen is in group 16, which means it has a -2 charge.)

3. See if the charges are balanced (if they are you're done!)

- when you criss cross (getting Ni2O3, the charges are canceled out, so the equation is balanced.

if you still need help or if this is confusing, look up How to Write the Formula for Nickel (III) oxide  by Wayne Breslyn on YT.

Answer:

D.) Ni2O3

Explanation:

edge 2021 (just needed the daily answer)

Answer:

C3H6O + 4O2 → 3CO2 + 3H2O

Explanation:

I think that's the answer

Hope this helps :)

Answer:

Temperature is the condition of the atmosphere at any given time and place

and climate is the weather over a long period of time

Explanation:

I think so-

Since ethanol has a boiling point of 78 °C while hexane has a boiling point of 68 °C, A. hexane will be removed by distillation.

In distillation, a mixture of two or more liquids with different boiling points is heated to evaporate the liquid with the lower boiling point, and then condense and collect it as a pure liquid. The liquid with the higher boiling point remains in the original container as a residue.

In this scenario, ethanol has a boiling point of 78 °C and hexane has a boiling point of 68 °C. This means that when the mixture is heated, ethanol will start evaporating at a higher temperature than hexane. Therefore, ethanol will not be removed by distillation since it will remain in the original container as residue. On the other hand, hexane will evaporate first due to its lower boiling point and will be collected as a pure liquid through distillation.

In conclusion, hexane would be the liquid that could be removed by distillation since it has a lower boiling point than ethanol. It is important to note that distillation is a useful separation technique for mixtures of liquids with different boiling points and it can be used in various industries such as chemical, pharmaceutical, and food processing. Hence, the answer is A. hexane.

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Answer:

Pic attached of structures

Explanation:

a) Propanal       (R-CHO; Carbonyl grp structure)

b) Dimethyl ether or methoxymethane     (R-O-R)

A) The pH of 0.215 M carbonic acid with a Ka₁ of 4.3 x 10⁻⁷ is 3.52. B) The addition of solid sodium hydrogen carbonate to the carbonic acid solution will result in the formation of a buffer solution, which will resist changes in pH.

This is because sodium hydrogen carbonate is a weak base that will react with the weak acid, carbonic acid, to form its conjugate base, bicarbonate ion, and water. The bicarbonate ion will then act as a weak acid, reacting with any added strong base, such as hydroxide ion, to maintain the pH of the solution within a certain range. Therefore, the pH will remain relatively stable when sodium hydrogen carbonate is added to the carbonic acid solution.

C) The pH of a 0.820 M solution of sodium hydrogen carbonate can be calculated using the equation for the ionization of bicarbonate ion in water, which is:

HCO₃⁻ + H₂O ⇌ H₂CO₃ + OH⁻

The concentration of OH⁻ can be determined by using the Kw of water, which is 1.0 x 10⁻¹⁴ at 25°C. The pH of the solution can then be calculated using the equation:

pH = pKb + log([HCO₃⁻]/[CO₃²⁻])

where pKb is the negative logarithm of the base dissociation constant, Kb, of bicarbonate ion, which is equal to Kw/Ka₂, and [HCO₃⁻] and [CO₃²⁻] are the concentrations of bicarbonate and carbonate ions in the solution, respectively. The pH of the solution is found to be 6.95

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Answer:

\(\boxed {\tt 37.0555556 \textdegree C}\)

Explanation:

The formula to convert Fahrenheit to Celsius, use the following formula.

\(C=(\textdegree F -32)*\frac{5}{9}\)

We want to convert 98.7 degrees Fahrenheit to Celsius, so we must substitute 98.7 in for degrees Fahrenheit.

\(C=(98.7 -32)*\frac{5}{9}\)

Solve inside the parentheses. Subtract 32 from 98.7.

\(C=(66.7)*\frac{5}{9}\)

Multiply 66.7 by 5/9.

\(C=37.0555556\)

98.7 degrees Fahrenheit is equal to 37.0555556 degrees Celsius

Answer:

Fahrenheit (f) =98.7°f

Celsius (c) =?

now

c/100=f-32/180

180c=100f-3200

180c=100*98.7-3200

180c=9870-3200

180c=6670

c=6670/180

c=37.05°c

The Avogadro's number is the constant number for the number of atoms or molecules represented in 1 mol, this number is equal to 6.022*10^23, to find out how many molecules there are in 6.0 moles we can set up this equation:

6.0 moles of CH4 * 6.022*10^23 molecules / 1 mol of CH4

The answer will be 3.61*10^24 molecules of CH4

Energy bond of N-Br can't be calculated only with the data of energy bond of N-N and Br-Br. The energy bond of N-Br is 243kJ/mol

Energy bond can be determined by using experiment. To calculate energy bond of N-Br by using energy bond of N-N and Br-Br need 1 more data of the difference of Enthalpy reactant and product. In this case the reaction can be determine as below:
N-N + Br-Br = 2 N-Br

The equation can be used is:
Energy bond N-N + Energy bond Br-Br - Energy bond of 2 N-Br = Enthalpy

If the enthalpy of the reaction not provided, energy bond of N-Br can not be determined. But, you can check on the reference for N-Br energy bond.

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Answer:

A chain of volcanic

Explanation:

Answer:

A

Explanation:

In ideal conditions, 90 grams of glucose require 95.92 grammes of oxygen to react.

This tells us that 1 molecule of glucose must be oxidised by 6 molecules of oxygen (O2) (C6H12O6). Hence, 1 mole of glucose requires the oxidation of 6 moles of oxygen. Hence, 180 grams of glucose require 6 x 32 = 192 grams of oxygen to be oxidised.

Applying the balanced chemical equation

C6H12O6 + 6O2 -> 6CO2 + 6H2O

First, we need to calculate the number of moles of glucose in 90 grams:

Number of moles of glucose = mass / molar mass

Number of moles of glucose = 90 g / 180.16 g/mol (molar mass of C6H12O6)

Number of moles of glucose = 0.4996 mol

Then, we may determine how many moles of oxygen are needed by using the mole ratio between glucose and oxygen:

Number of moles of oxygen = 6 x number of moles of glucose

Number of moles of oxygen = 6 x 0.4996 mol

Number of moles of oxygen = 2.9976 mol

Lastly, we may convert the amount of moles to grammes using the molar mass of oxygen:

Mass of oxygen = number of moles x molar mass

Mass of oxygen = 2.9976 mol x 32.00 g/mol (molar mass of O2)

Mass of oxygen = 95.92 g

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Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

Explanation:

The periodic table brings order to information about the chemical elements. It helps chemists to understand why elements react as they do. Elements in the same group have similar chemical properties. This is because they have the same number of outer electrons and the same valency

If an object's mass is 70 g, and its volume is 10cm cubed,  its density is 7 centimeter cube.

The density of any solid substance is the unit of the area occupied by it in per centimeter of the cube of the volume in the given sample and calculated by dividing the mass and the volume of the compound unit will be centimeter cube.

The mass of the given object is 70 gram and the volume is given is 10 cm to find the density,

                       Density = mass of object / volume of object

substituting the value in the formula,

                 Density = 70 / 10

                 Density = 7 centimeter cube.

Therefore, the density of the given object will be 7 centimeter cube if  an object's mass is 70 g, and its volume is 10cm cubed.

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Answer:

5 would be the large intestine

Explanation:

Answer:

n = 7.86 mol

Explanation:

This question can be solved using the ideal gas law of PV = nRT.

Temperature must be in K, so we will convert 22.5C to 295 K ( Kelvin = C + 273).

R is the ideal gas constant of 0.0821.

(2.24atm)(85.0L) = n(0.0821)(295K)

Isolate n to get:

n = (2.24atm)(85.0L)/(0.0821)(295K)

n = 7.86 mol

Answer:

The reaction produces insoluble lead (II) sulphate which coats the surface of lead (II) nitrate  [Pb(NO3)]

Answer:

b. They do not move through the rock cycle at the same rate

Explanation:

The rock cycle is the phenomenon used to describe the interrelation of the three forms in which rocks exists, and a rock is changed between forms due to the Earth's geologic process, such as erosion, weathering and plate tectonics

The rock cycle involves both chemical and physical transformation of rocks and therefore, the atoms and compounds make and cut connections, such that the rate at which each atom move through the rock cycle at different rate

The product of molar concentration of ion present in chemical reactants raised to the power of number of ions produced per chemical compound in a saturated solution is called: solubility product.

Solubility product can be defined as a product of the molar concentration of ion present in two or more chemical reactants raised to the power of number of ions produced per chemical compound in a saturated solution.

Mathematically, the solubility product is given by this formula:

\(K_{sp} = [A^+]^x[B^{-}]^y\)

Where:

In Chemistry, the solubility product is typically used as an equilibrium constant for the dissolution of a chemical compound in a saturated solution.

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Answer:

Efflorescence is a deposit of salts, usually white, formed on a surface, the substance having emerged in solution from within either concrete or masonry and subsequently precipitated by evaporation

Explanation:

Here is why: If the atmosphere contains too much of these gases, the whole Earth becomes a hotter and hotter greenhouse. The atmosphere holds onto too much of the heat at night instead of letting it escape into space. Then, the next day, the Sun heats Earth's surface even more.

Answer: During a chemical change, the composition of matter always changes

Explanation: