What is the w/w % of an aqueous solution of ammonia at 14.3 M, with a density of 0.900 g/mL.

Answer:

Homogeneous

Explanation:

Answer:

They are irreversible

Explanation:

This is because it cannot be separated by physical means

Answer:

C. easily dissociates into ions when I’m solution

Explanation:

Strong acids are compounds that completely decompose when dissolved in water and produce the total number of ions.

If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

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A reaction occurs as a result of the combination of reactants and products.

We have to learn that a reaction occurs as a result of the combination of reactants and products. We know that the products formed may often be quite different from the reactants that were combined to produce them.

Having said so, let us look at the equations one after the other;

Mg + 2HCl ------> MgCl2 + H2. There is the evolution of a colorless and odorless gas that gives a pop sound with glowing splint.

CuCl2 + HCl ----> There is no observation

2NaHCO3 + H2SO4 --> Na2SO4 + 2H2O + 2CO2 - There is evolution of a gas that turns lime water milky

CuO + H2SO4 → CuSO4 + H2O - The solution turns blue and there is no effect both on lime water and glowing splint.

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Answer:

Hope this helps u pls mark me brainlist

Explanation:

roentgenium (Rg), artificially produced transuranium element of atomic number 111.The element would have similar characteristics as the one next to it.

Fresh water is a limited resource. If we pollute the fresh water we have, there will be a shortage of clean drinking water in the future.

Answer:

the 2nd one.

Explanation:

If it was half of b then it would be the 3rd.

The density of mercury in pounds per cubic inch is 0.49 lb/in³.

Mercury is the only metal that exists in liquid form. The density of mercy is 13.6 g/cm³. It's one of the essential application is in thermometers, especially the ones used in chemistry labs. It is used to measure the temperature of various things. As with the increase in temperature, the mercury present inside the thermometer also increases.

The density of the mercury = 13.6 g/cm³.

1 lb = 2.54 cm

1 lb = 454 g

The density of the mercury in pounds per cubic inch is,

\(13.6 \frac{g}{cm ^{3} } = 13.6 \frac{g}{cm ^{3} } \times \frac{1 \: lb}{454 \: g } \times ({ \frac{2.54}{1 \: in} } ) {}^{3} \)

\(13.6 \frac{g}{cm ^{3} } \times \frac{1 \: lb}{454 \: g } \times ({ \frac{2.54 {}^{3} \: cm ^{3} }{1 ^{3} \: in ^{3} } } )\)

= 0.49 lb/in³

Therefore, the density of mercury in pounds per cubic inch is 0.49 lb/in³.

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The false statemen about the Catabolic pathways is they generate ATP.

option D is the correct answer.

Catabolic pathways involve the breakdown of complex molecules into simpler ones, releasing energy in the process.

Catabolism is the breakdown of complex substances to their constituent parts (glucose, amino acids and fatty acids) which form substrates for metabolic pathways or processes.

The true statement about catabolic pathways are;

Thus, the false statement is they generate ATP.

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Washing up liquid is used in enzyme experiments as a tool to help control the reaction conditions and to demonstrate the power and versatility of enzymes.

Washing up liquid is used in enzyme experiments for several reasons:

To break down grease and oils: Enzymes are commonly used in laundry detergents and dishwashing liquids to help break down grease and oils on clothing and dishes. In enzyme experiments, washing up liquid can be used to simulate this effect and demonstrate the power of enzymes.

To increase the surface area for reaction: By adding washing up liquid to an enzyme experiment, the surface area for reaction is increased, allowing the enzymes to react with a larger amount of substrate and produce more product.

To act as a surfactant: Washing up liquid contains surfactants, which are compounds that lower the surface tension of liquids and allow the enzymes to diffuse into the substrate more easily. This helps to increase the reaction rate of the enzymes.

To control the viscosity of the reaction mixture: Washing up liquid can also help to control the viscosity of the reaction mixture, allowing the enzymes to move freely and react with the substrate.

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Answer:

Calcium chloride and calcium bromide can have similar properties since they are formed with halogen anions Cl− and Br-.

Explanation:

These elements pertain to the same group of the periodic table, and thus similar properties are expected for the salts they form

Propane produces more energy as compared to ethanol during burning.

Energy produce by ethanol is 10.45 kilojoules per gram whereas  propane release 46 kilojoules per gram of energy when burn so by comparing these two chemicals we can conclude that propane produces more energy as compared to ethanol during burning.

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The correct options are: (1) C. Was better insulated from, (2) B. Greater Than

1. C. Was better insulated from

The steel plaque may have had a higher temperature than the wooden block because it was better insulated from its surroundings. This means that the steel plaque could have had a lower rate of heat transfer to the surrounding environment, allowing it to retain more of the energy it received from the sun.

2. B. Greater Than

If the steel and the wood received the same amount of energy from the sun, but the steel plaque had a higher temperature, it suggests that the specific heat capacity of the steel is greater than the specific heat capacity of the wood. Specific heat capacity is a measure of how much heat energy is required to raise the temperature of a substance by a certain amount. A higher specific heat capacity indicates that a substance can absorb more heat energy per unit mass, resulting in a higher temperature increase.

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Answer:

vacuole

Explanation:

Brainliest please

Answer:

Alpha decay

Explanation:

That's the definition of alpha decay

Alpha decay would be an alpha product when released from an isotope. A further explanation is below.

Thus the above alternative is right.

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The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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Answer:

Autotrophs

Explanation:

They are responsible for the production of food. Root words "auto" for self and "troph" for food.

1a. The empirical formula of the compound is Fe₂O₃

1b. The molecular formula of the compound is Fe₂O₃

2a. The molecular formula of the anhydrous salt is MgSO₄

2b. The formula of the crystalline salt is MgSO₄.7H₂O

3i. The number of mole of carbon atoms in the compound is 6 moles

3ii. The number of mole of hydrogen atoms in the compound is 18 moles

3iii. The number of molecules in 3 moles of ethane is 1.806×10²⁴ molecules

Divide by their molar mass

Fe = 69.9 / 56 = 1.248

O = 30 / 16 = 1.875

Divide by the smallest

Fe = 1.248 / 1.248 = 1

O = 1.875 / 1.248 = 3/2

Multiply by 2 to express in whole number

Fe = 1 × 2 = 2

O = 3/2 × 2 = 3

Thus, the empirical formula of the compound is Fe₂O₃

Molecular formula = empirical × n = molar mass

[Fe₂O₃]n = 159.89

[(56×2) + (16×3)]n = 159.89

160n = 159.89

n = 159.89 / 160

n = 1

Molecular formula = [Fe₂O₃]n

Molecular formula = [Fe₂O₃] × 1

Molecular formula = Fe₂O₃

We'll begin by calculating the empirical formula

Divide by their molar mass

Mg = 20.0 / 24 = 0.83

S = 26.66 / 32 = 0.83

O = 53.33 / 16 = 3.33

Divide by the smallest

Mg = 0.83 / 0.83 = 1

S = 0.83 / 0.83 = 1

O = 3.33 / 0.83 = 4

Thus, the empirical formula of the anhydrous salt is MgSO₄

The molecular formula of the anhydrous salt can be obtained as follow:

Molecular formula = empirical × n = molar mass

[MgSO₄]n = 120

[24 + 32 + (16×4)]n = 159.89

120n = 120

n = 120 / 120

n = 1

Molecular formula = [MgSO₄]n

Molecular formula = [MgSO₄] × 1

Molecular formula = MgSO₄

Divide by their molar mass

MgSO₄ = 48.8 / 120 = 0.4

H₂O = 51.2 / 18 = 2.8

Divide by the smallest

MgSO₄ = 0.4 / 0.4 = 1

H₂O = 2.8 / 0.4 = 7

Thus, the formula of the crystalline salt is MgSO₄.7H₂O

1 mole of C₂H₆ contains 2 moles of carbon atoms.

Therefore,

3 moles of C₂H₆ will contain = 3 × 2 = 6 moles of carbon atoms

1 mole of C₂H₆ contains 6 moles of hydrogen atoms.

Therefore,

3 moles of C₂H₆ will contain = 3 × 6 = 18 moles of hydrogen atoms

From Avogadro's hypothesis,

1 mole of ethane = 6.02×10²³ molecules

Therefore,

3 moles of ethane = 3 × 6.02×10²³ molecules

3 moles of ethane = 1.806×10²⁴ molecules

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Complete question

2. A crystalline salt when heated becomes anhydrous and loses 51.2% of its weight the anhydrous salt analysis gave the percent composition as magnesium is equal to 20.0% and sulphur is equal to 26.66% and oxygen is equal to 53.33%. Ccalculate the molecular formula of the anhydrous and the crystalline salt. The molecular weight of the anhydrous salt is 120

Answer:

the sour food changed

Explanation:

because the molecules were able to move fast enough to overcome the attraction between them, it's molecules now move in place

The end result of glycolysis is the production of two molecules of pyruvate or pyruvic acid i.e CH₃COCOOH, two molecules of ATP, and two molecules of NADH. Option B is correct.  

Pyruvate is a three-carbon molecule that can be further metabolized through the Krebs cycle and oxidative phosphorylation to produce more ATP.

Glycolysis is important because it is the first step in the breakdown of glucose to extract energy for cellular metabolism. Glucose is a major source of energy for most living organisms, and glycolysis provides the initial breakdown of glucose to produce ATP.

This process can occur in the absence of oxygen, which is essential for cells that cannot access oxygen. In addition, the two ATP molecules produced in glycolysis provide immediate energy for cellular processes, and the NADH molecules produced can be used to generate more ATP through the subsequent steps of cellular respiration.

Hence, B. CH₃CO.COOH is the correct option.

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--The given question is incorrect, the correct question is

"what is the end result of glycolysis? why is this step important? A) CH₃CH₂OH B) CH₃CO.COOH C) CH₃HCOH -- COOH D) CH₃CH₂COOH"--

Answer:

The amount of HC₂H3₃2(aq) in the flask after the addition of 5.0mL of NaOH(aq) compared to the amount of HC₂H₃O₂(aq) in the flask after the addition of 1.0mL is much smaller because more HC₂H₃O₂(aq) is required to react with 5.0 mL NaOH than with 1.0 mL NaOH.

Explanation:

Equation of the reaction between acetic acid, HC₂H₃O₂(aq) and sodium hydroxide, NaOH(aq) is given below:

CH₃COOH (aq) + NaOH (aq) ----> CH₃COONa (aq) + H₂O

The equation of the reaction shows that acetic acid andsodium hydroxide will react in a 1:1 ratio

Since the concentration of NaOH was not given, we can assume that the concentration is 0.01 M

Moles of NaOH in 5.0 mL of 0.01 M NaOH = 0.01 × 5/1000 = 0.00005 moles

Moles of NaOH in 1.0 mL of 0.01 M NaOH = 0.01 ×1/1000 = 0.0001 moles

Ratio of moles of NaOH in 5.0 mL to 1.0 mL = 0.00005/0.00001 = 5

There are five times more moles of NaOH in 5.0 mL than in 1.0 mL and this means that 5 times more the quantity of HC₂H₃O2(aq) required to react with 1.0 mL NaoH is needed to react with 5.0 mL NaOH.

Therefore, the amount of HC₂H₃O2(aq) in the flask after the addition of 5.0mL of NaOH(aq) compared to the amount of HC₂H₃O₂(aq) in the flask after the addition of 1.0mL is much smaller because more HC₂H₃O₂(aq) is required to react with 5.0 mL NaOH than with 1.0 mL NaOH.

The net ionic equation for the given condition is: -

MnO4 (aq) + 5Fe2+ (aq) + 8H30+ (aq)— Mn2+ (aq) + 5Fe3+ (aq) + 12H2O(a)

A balanced chemical equation is the equation where all the number of reactant and products are equalized based on the number of moles and concentration.

        According to the given condition, we have 0.1569 Molar permanganate solution titrated.

    For 1L of solution we have 0.1569 molar permanganate,

Therefore,

1000ml = 0.1569m

19.53ml = 19.53 x 0.1569 / 1000

              = 0.00306 moles. = 3.06 x 10^-3 moles.

The ionic equation says that 1 mol of MnO4- reacts with 5 moles of Fe2+ so, 3.06 x 10^-3 reacts with 19.53 ml to give,

19.53ml = 3.06 x 10^-3

30.00 ml = 3.06 x 10^-3 x 30.00/ 19.53

               = 4.700 x 10^-3 moles.

This quantity of moles are in the solution required, in the volume i was given (30.00 ml). To get the concentration I have to calculate the moles in 1L.

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Hydrogen bonds can form between molecules that contain hydrogen atoms covalently bonded to nitrogen (N), oxygen (O), or fluorine (F) atoms, and another molecule containing nitrogen, oxygen, or fluorine atom(s) with a partial negative charge.

Examples of molecules that can form hydrogen bonds with identical molecules include:

Water (H2O): Water molecules can form hydrogen bonds with each other, resulting in strong intermolecular forces that give rise to unique properties such as high boiling point, surface tension, and capillary action.

Ammonia (NH3): Ammonia molecules can also form hydrogen bonds with each other due to the presence of a lone pair of electrons on the nitrogen atom.

Hydrogen fluoride (HF): Hydrogen fluoride molecules can form hydrogen bonds with each other, which contributes to its relatively high boiling point despite its small size.

Other molecules that contain N, O, or F atoms, such as alcohols, carboxylic acids, and amines, can also form hydrogen bonds with identical molecules or other molecules containing N, O, or F atoms with partial negative charges. Hydrogen bonding plays a crucial role in many biological processes and chemical reactions, and its understanding is important in various fields of science and technology.

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Answer:

because in bellon when we pump he throw carbon dioxide not hydrogen

Answer:

Because helium is lighter than air, a helium balloon rises. Hydrogen is another gas lighter than air; it is even lighter than helium.

Explanation:

Hydrogen is not used in balloons and this demonstration shows why. ... This is because hydrogen burns very easily.

Answer:

D Properties

Explanation:

hope this helps

Answer: D Properties

Explanation:

A property is an attribute that we use to identify an object which tells us about the components of the given thing.

In chemistry, Property tells us the characteristics of a particular matter or substance. We use the physical properties or chemical Properties of elements to differentiate them.

Terms used to ascribe to the physical properties which we can quickly observe or after a physical change are color, density, hardness, appearance etc

Terms used to ascribe to the chemical properties after  chemical change include , acidity, reactivity and heat, etc .

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Answer:

The answer is 2 significant figures.

1.90+2.3+5.700=9.9

Answer:

i think ur right

Explanation: