A chemical change :a.occurs when powdered lemonade is stirred into water. b.occurs when water is vaporized. c.occurs when paper is shredded. d.occurs when salt is dissolved in water. e.occurs when methane gas is burned.

Answer:

negative, positive, increase

Explanation:

From the given question,  

During the formation of bond, between two atoms with difference between their electronegativity-

And,

Atoms with different electronegativities share electrons unequally, leading to partial charges. The more electronegative atom gains a partial negative charge, while the other has a partial positive charge. Larger electronegativity differences intensify these charges.

When two atoms with different electronegativities form a covalent bond, the atom with higher electronegativity will attract shared electrons more and will have a partial negative charge. Conversely, the atom with lower electronegativity will have an equal and opposite partial positive charge. As the difference in electronegativity increases, the resulting magnitudes of the partial charges will also increase.

Answer:

The answer to your question is 4

Explanation:

Chemical reaction

                C₂H₆  +  O₂  ⇒  CO₂  +  H₂O

           Reactants    Elements    Products

                  2            Carbon              1

                  6            Hydrogen         2

                  2            Oxygen             3

Balanced chemical reaction

                2C₂H₆  +  7O₂  ⇒  4CO₂  +  6H₂O

           Reactants    Elements    Products

                  4            Carbon             4

                 12            Hydrogen       12

                 14            Oxygen           14

When the reaction is balanced the coefficient for CO₂ is 4.

lanation:

It has to be 30 degrees

Answer:

False

Explanation:

Chemical changes do change the composition of the substance. However, physical changes do not; physical changes simply alter the physical form of the substance.

For example, a melting ice cube is undergoing a physical change, but its overall composition of H2O isn't changing. It's just changing from a solid form to a liquid form.

Hope this helps!

Answer:

false

Explanation:

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.

Answer: D

Explanation:

Because in the reactant side there's/re 1 Ca atom as well as in the product side

                                                                 2 Cl atoms as well as in the product side

                                                                 2 H atoms as well as in in the product side

                                                                 1 C atom as well as in the product side

                                                                 3 O atoms as well as in the product side

Hope this help^^

The chemical equation occurs whenever the number of atoms included in the side of the reaction equals the atomic mass involved inside the product's side. Following are calculations to the balanced reaction:

Sides of the reactant:

Calculating the product side:

Therefore, the answer is "option D".

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Answer:

Reproduction is asexual and occurs at a rapid rate.

Answer: Reproduction is asexual and occurs at a rapid rate.

Explanation:i did the quiz

Answer:

4.2 L

Explanation:

Use Boyle's Law and rearrange formula.

- Hope this helps! Please let me know if you need further explanation.

To find the volume of the neon gas at 1.2 atm, we can use the combined gas law equation.

To solve this problem, we can use the combined gas law equation:

P1V1 / T1 = P2V2 / T2

First, we need to convert the given volume in liters to moles using the ideal gas law equation:

V1 = nRT1 / P1

Then, we can rearrange the combined gas law equation to solve for V2:

V2 = (P2 * V1 * T2) / (P1 * T1)

Substituting the given values, we get:

V2 = (1.2 atm * 2.8 L * 273 K) / (1.8 atm * 273 K) = 1.233 L

Therefore, the volume of the neon gas at 1.2 atm would be 1.233 liters.

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Answer:

1) The solubility product of the lead(II) chloride is [tex]1.2\times 10^{-4}[/tex].

2) The solubility of the aluminium hydroxide is [tex]1.6\times 10^{-10} M[/tex].

3)The given statement is false.

Explanation:

1)

Solubility of lead chloride = [tex]S=3.1\times 10^-2M[/tex]

[tex]PbCl_2(aq)\rightleftharpoons Pb^{2+}(aq)+2Cl^-(aq)[/tex]

                            S     2S

The solubility product of the lead(II) chloride = [tex]K_{sp}[/tex]

[tex]K_{sp}=[Pb^{2+}][Cl^-]^2[/tex]

[tex]K_{sp}=S\times (2S)^2=4S^3=4\times (3.1\times 10^{-2})^3=1.2\times 10^{-4}[/tex]

The solubility product of the lead(II) chloride is [tex]1.2\times 10^{-4}[/tex].

2)

Concentration of aluminium nitrate = 0.000010 M

Concentration of aluminum ion =[tex]1\timed 0.000010 M=0.000010 M[/tex]

Solubility of aluminium hydroxide in aluminum nitrate solution = [tex]S[/tex]

[tex]Al(OH)_3(aq)\rightleftharpoons Al^{3+}(aq)+3OH^-(aq)[/tex]

                            S     3S

The solubility product of the aluminium nitrate = [tex]K_{sp}=1.0\times 10^{-33}[/tex]

[tex]K_{sp}=[Al^{3+}][OH^-]^3[/tex]

[tex]1.0\times 10^{-33}=(0.000010+S)\times (3S)^3[/tex]

[tex]S=1.6\times 10^{-10} M[/tex]

The solubility of the aluminium hydroxide is [tex]1.6\times 10^{-10} M[/tex].

3.

[tex]Molarity=\frac{Moles}{Volume (L)}[/tex]

Mass of NaCl= 3.5 mg = 0.0035 g

1 mg = 0.001 g

Moles of NaCl = [tex]\frac{0.0035 g}{58.5 g/mol}=6.0\times 10^{-5} mol[/tex]

Volume of the solution = 0.250 L

[tex][NaCl]=\frac{6.0\times 10^{-5} mol}{0.250 L}=0.00024 M[/tex]

1 mole of NaCl gives 1 mole of sodium ion and 1 mole of chloride ions.

[tex][Cl^-]=[NaCl]=0.00024 M[/tex]

Moles of lead (II) nitrate = n

Volume of the solution = 0.250 L

Molarity lead(II) nitrate = 0.12 M

[tex]n=0.12 M]\times 0.250 L=0.030 mol[/tex]

1 mole of lead nitrate gives 1 mole of lead (II) ion and 2 moles of nitrate ions.

[tex][Pb^{2+}]=[Pb(NO_2)_3]=0.030 M[/tex]

[tex]PbCl_2(aq)\rightleftharpoons Pb^{2+}(aq)+2Cl^-(aq)[/tex]

Solubility of lead(II) chloride = [tex]K_{sp}=1.2\times 10^{-4}[/tex]

Ionic product of the lead chloride in solution :

[tex]Q_i=[Pb^{2+}][Cl^-]^2=0.030 M\times (0.00024 M)^2=1.7\times 10^{-9}[/tex]

[tex]Q_i<K_{sp}[/tex] ( no precipitation)

The given statement is false.

The Ksp of PbCl2 at a given temperature is calculated using the solubility of the compound. For Al(OH)3 in a solution containing Al(NO3)3, the solubility would be influenced by the common ion effect. The potential formation of a PbCl2 precipitate depends on the concentrations of lead(II) and chloride ions.

Calculation of Ksp and Solubility

The solubility product (Ksp) represents the equilibrium between a solid and its corresponding ions in a solution. It is a unique value for each soluble compound at a given temperature.

1. Ksp of PbCl2

The dissolution of PbCl2 can be written as:

PbCl2(s) ⇌ Pb2+(aq) + 2Cl-(aq)

Given the solubility of PbCl2 is 3.1 x 10-2 M, we can deduce the concentration of Pb2+ is 3.1 x 10-2 M and Cl- is 2 x 3.1 x 10-2 M. Thus, the Ksp can be calculated using the formula:

Ksp = [Pb2+][Cl-]2 = (3.1 x 10-2) x (2 x 3.1 x 10-2)2 =  5.88 x 10-5

2. Solubility of Al(OH)3 in Al(NO3)3 Solution

Given the Ksp of Al(OH)3 is 1.0 x 10-33, and the initial concentration of Al3+ from Al(NO3)3 is known, we need to account for the common ion effect which will reduce the solubility of Al(OH)3. This complex calculation would require additional steps to accurately account for the common ion.

3. Formation of PbCl2 Precipitate

NaCl dissociates to give Cl- ions and the Pb2+ from Pb(NO3)2 can form PbCl2, depending on the product of their concentrations relative to the Ksp of PbCl2. This assessment involves comparing the ionic product to the Ksp to determine if a precipitate will form.

Answer:

Explanation:

D. The transfer of thermal energy to the ice cube causes its molecules to move faster.

Answer:

its A heat causes the molecules in the cube to expand and forces them apart.

Explanation:

The scale model of the Mars rover and landscape is a good model as it is based on scientific principles, can make predictions, and be analyzed for reliability.

This rover model created by the scientists has several factors that make it a good model for the Martian landscape. B. It is based on sound scientific principles: This model is created using scientific facts and principles about the Mars terrain and the rover itself, ensuring it is a legitimate representation of the actual conditions on Mars. C. It can be used to make predictions: The scientists can use this model to test different circumstances and see how the rover would behave, allowing them to predict any problems that might be encountered on the actual planet. D. It can be analyzed and shown to be reliable or un-reliable: After running tests, the model's representation of reality can be assessed. If it accurately predicts the rover's action in the real Martian environment, it can be considered reliable. If not, it is seen as unreliable.

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48.70 is the volume, in liters, occupied by 1.73 moles of Nitrogen gas at 0.992 atm pressure and a temperature of 75º C.

Explanation:

Data given:

number of moles of nitrogen gas = 1.73 moles

pressure of the gas = 0.992 atm

temperature of the gas = 75 degrees or 273.25 + 75 = 348.15 K

R (gas constant) = 0.08206 L atm/molesK

volume of the nitrogen gas under these conditions =?

The formula used is of ideal Gas Law:

PV = nRT

Rearranging the equation to get,

V = [tex]\frac{nRT}{P}[/tex]

putting the values in the equation:

V = [tex]\frac{1.73 X 0.08026 X 348.15}{0.992}[/tex]

  = 48.70 Litres

the volume of the gas is 48.70 litres from the standard values used in the equation.

The volume, in liters, occupied by 1.73 moles of N₂ gas at 0.992 atm pressure and a temperature of 75º C is: [tex]45.81 \text{ L}.[/tex]

The volume occupied by the N₂ gas can be calculated using the ideal gas law, which is given by the equation:

[tex]\[ PV = nRT \][/tex]

where:

- [tex]\( P \)[/tex] is the pressure of the gas,

- [tex]\( V \)[/tex] is the volume of the gas,

- [tex]\( n \)[/tex] is the number of moles of the gas,

- [tex]\( R \)[/tex] is the ideal gas constant, and

- [tex]\( T \)[/tex] is the temperature of the gas in Kelvin.

Given:

- [tex]\( n = 1.73 \)[/tex] moles,

- [tex]\( P = 0.992 \)[/tex] atm,

- [tex]\( T = 75^\circ C \)[/tex], which needs to be converted to Kelvin by adding 273.15 to the Celsius temperature,

- [tex]\( R = 0.08206 \) L\atm/(mol\K).[/tex]

First, convert the temperature from Celsius to Kelvin:

[tex]\[ T(K) = T(^\circ C) + 273.15 = 75 + 273.15 = 348.15 \text{ K} \][/tex]

Now, rearrange the ideal gas law to solve for the volume [tex]\( V \)[/tex]:

[tex]\[ V = \frac{nRT}{P} \][/tex]

Substitute the given values into the equation:

[tex]\[ V = \frac{(1.73 \text{ mol})(0.08206 \text{ L\·atm/(mol\·K)})(348.15 \text{ K})}{0.992 \text{ atm}} \][/tex]

[tex]\[ V = \frac{(1.73)(0.08206)(348.15)}{0.992} \][/tex]

[tex]\[ V = \frac{45.460298}{0.992} \][/tex]

[tex]\[ V \approx 45.81 \text{ L} \][/tex]

Therefore, the volume occupied by 1.73 moles of N2 gas at 0.992 atm pressure and a temperature of 75º C is approximately 45.81 liters.

Answer:

spring tide

Explanation:

when both the sun and moon aligned th affect of each is added together producing higher than normal tides called SPRING TIDES

Answer:

Spring Tide

Explanation:

In both cases, the gravitational pull of the sun is 'added' to the gravitational pull of the moon on Earth, causing the oceans to bulge a bit more than usual. This means that high tides are higher and low tides are lower than average. These are called 'spring tides.

Answer:Eat a light dinner and avoid foods that trigger your heartburn. Don't lie down for at least 2 to 3 hours after you eat. Use blocks or books to raise the head of your bed by 4-6 inches. Or put a foam wedge under your mattress at the head of the bed.

Explanation:

Answer:

The answer is I think None.

Answer:

Option B

Explanation:

We have the tree solutions here:

A: weak monoprotic acid HA

B: Strong monoprotic acid HA'

C: weak diprotic acid H₂A

In order to explain this, let's discart the options one by one.

C and D cannot be the correct choice. This is because the pH is an expression that is determined by the following expression:

pH = -log[H₃O⁺]

In order to be the same value for all the solutions, the concentration of hydronium should be the same for all. This will be correct if all solutions were monoprotic and strong. However this is not the case.

Solution A and C are weak acids, so this means that they have dissociation constant Ka (In the case of C, it has two Ka values because it's diprotic). So, when these solutions reach the equivalence point or half the equivalence point, the concentration of the acid do not dissociate completely in solution, instead it do this:

HA + H₂O -------> A⁻ + H₃O⁺   Ka

0.1                        0        0

0.1-x                     x         x

[H₃O⁺] = x

Same thing happen with C, but we can see that the concentration is not the same as the innitial concentration.

Solution B is a strong acid, so it will dissociate completely in solution, so concentration of hydronium will be the same of the initial acid, and therefore the pH cannot be the same in the three solutions.

Option A cannot be either because, we have a diprotic solution, this means this acid requires two equivalence points to reach it's final, so, it takes more time and volume to reach the end point. Therefore, it's not the correct option.

Option B is the correct one, because regardless that we have a weak or a strong acid, or if it's diprotic or triprotic, the three of them have the same concentration of acid, and to reach the first equivalence point (the only point for A and B) will be the same for solution C. Therefore, this is the only thing the three solutions have in common.

Answer:

The half-reaction that occurs on the anode of an electrolytic cell is called oxidation.

This can easily be depicted by a chemical reaction as such "Zn(s) = Zn2+ (aq) + (2e-)"

While, the Zinc in this reaction loses two elections. Hence copper gains those electrons and becomes solid.

These reactions occurring on the anode are called positive reactions.

While the reaction that occurs on the cathode is called reduction. This reaction can be represented by this equation "Cu2+ (aq) + 2e- = Cu(s)".

These non-spontaneous reactions occurring in an electrolytic cell together are called redox reactions. These generate electrical energy.

In the electrolytic cell for commercial magnesium production, the half-reaction at the anode (positive electrode) is oxidation, where electrons are lost. If magnesium chloride is the electrolyte, chloride ions are oxidized to form chlorine gas.

In the electrolytic cell used for the commercial production of magnesium, the anode is the positive electrode. As it is where oxidation occurs, the half-reaction happening at the anode involves the removal of electrons. The specific half-reaction varies based on the electrolyte used. If pure molten magnesium chloride (MgCl2), a common electrolyte, is used, the half-reaction at the anode would be: Cl- —> Cl2 + 2e- . This equates that chloride ions (Cl-) lose electrons (are oxidized) to form chlorine gas (Cl2).

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Answer:

Thus, one gram of Hemoglobin carries 1.389 mL of oxygen.

Explanation:

Each hemoglobin molecules carries 4 oxygen molecules.

Given that the molar mass of  hemoglobin = 64,5000 g/mol

1 gram of  hemoglobin = [tex]\frac{1}{64500}moles[/tex]

Now, no of moles of oxygen carried in 1 mole of  hemoglobin = [tex]\frac{1}{64500}* 4 \ \ moles[/tex]

= [tex]6.2016*10^{-5}[/tex] moles

assuming the oxygen is to be an ideal gas; then:

PV = nRT

[tex]V =\frac{nRT}{P}[/tex]

Given that :

[tex]\frac{RT}{P}= 22.4 \ L/mol[/tex]

Then V = [tex]6.2016*10^{-5}[/tex] [tex]*22.4 *1000 \ mol[/tex]

V = 1.389 mL

Thus, one gram of Hemoglobin carries 1.389 mL of oxygen.

Answer:

Sodium chloride (NaCl)

Explanation:

According to Arrhenius, an acid is a substance that dissociates to give protons, whereas a base dissociates to give hydroxide ions in an aqueous solution.

Therefore, a chemical reaction in which an Arrhenius acid reacts with an Arrhenius base to give salt and water, is known as a Neutralization reaction.

For example: Neutralization reaction of hydrochloric acid (HCl) and sodium hydroxide (NaOH)

A strong acid, hydrochloric acid (HCl) reacts with a strong base, sodium hydroxide (NaOH) to give salt, sodium chloride (NaCl) and water (H₂O).

The chemical equation for this Neutralization reaction:

HCl (acid) + NaOH (Base) → NaCl (Salt) + H₂O (Water)

Therefore, sodium chloride (NaCl) is the salt formed during the chemical reaction of hydrochloric acid (HCl) and sodium hydroxide (NaOH).

Answer:

D. none of the above

Explanation:

A. is wrong because pressure and volume have an inverse relationship. When one increases the other decreases, this is not an option.

B. is wrong because temperature and volume have a proportional relationship. One one goes up, the other goes up or vice versa.

C. is wrong because volume cannot increase the then decrease at the same time.

Answer : The volume of the balloon at the new location is, 591.3 L

Explanation :

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 0.995 atm

[tex]P_2[/tex] = final pressure of gas = 0.720 atm

[tex]V_1[/tex] = initial volume of gas = 500 L

[tex]V_2[/tex] = final volume of gas = ?

[tex]T_1[/tex] = initial temperature of gas = [tex]32.0^oC=273+32=305K[/tex]

[tex]T_2[/tex] = final temperature of gas = [tex]-12^oC=273+(-12)=261K[/tex]

Now put all the given values in the above equation, we get:

[tex]\frac{0.995atm\times 500L}{305K}=\frac{0.720atm\times V_2}{261K}[/tex]

[tex]V_2=591.3L[/tex]

Therefore, the volume of the balloon at the new location is, 591.3 L

Answer:5.3mol

Explanation:

Answer:

35.7%

Explanation:

The percent yield is calculated by the formula:

[(actual yield) / (theoretical yield)] * 100

In this case, the actual yield is 0.15 grams, and the theoretical yield is 0.42 grams. So, putting these values into the equation, we have:

[tex]\frac{0.15}{0.42} *100=0.357*100=35.7[/tex]

Thus, the percent yield of [tex]H_2[/tex] is 35.7%.

Hope this helps!

The percentage yield of a reaction is calculated using the equation: (Actual Yield / Theoretical Yield) * 100. In this case, the percentage yield of the reaction that produced H2 is approximately 35.7%.

The subject of this question is the percentage yield of a chemical reaction. In chemistry, the percentage yield is a measure of the efficiency of a reaction. It's calculated by dividing the actual yield (the amount of product actually produced) by the theoretical yield (the maximum amount of product that could be produced) and then multiplied by 100 to convert it to a percentage.

Given in the question, the theoretical yield of H2 is 0.42 grams and the actual yield is 0.15 grams. So, to calculate the percentage yield, we would use the formula: (Actual Yield / Theoretical Yield) * 100

Substituting the given amounts, the calculation would look like this: (0.15 / 0.42) * 100 = 35.7%.

So, the percentage yield of H2 in this reaction is approximately 35.7%.

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Answer: The concentration of the chemist's working solution is 0.00268 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

According to the neutralization law,

[tex]M_1V_1=M_2V_2[/tex]

where,

[tex]M_1[/tex] = molarity of stock solution = 10.7 mmol/L =  0.0107 mol/L  [tex]1mmol=10^{-3}mol[/tex]

[tex]V_1[/tex]  = volume of stock solution = 90.0 ml

[tex]M_2[/tex] = molarity of working  solution = ?

[tex]V_2[/tex] = volume of working solution = 360 ml

[tex]0.0107\times 90.0=M_2\times 360[/tex]

[tex]M_2=0.00268M[/tex]

Thus the concentration of the chemist's working solution is 0.00268 M

Answer:

Castings

Explanation:

Worm castings contain concentrated nitrates, calcium, etc.

Answer:

It will have expanded

Explanation:

Answer:

It will have expanded

Explanation:

alpha ,beta and gamma are nuclear radiation

Answer:

An endothermic reaction is one that absorbs energy in the form of heat or light. ... This is why we burn fuels (such as paraffin, coal, propane and butane) for energy, because the chemical changes that take place during the reaction release huge amounts of energy, which we then use for things like power and electricity.

Explanation:

Many endothermic reactions helps us i our daily life.

Combustion reactions

The burning of fuel is an example of a combustion reaction, and we as humans rely heavily on this process for our energy requirements. The following equations describe the combustion of a hydrocarbon such as petrol :

fuel + oxygen heat + water + carbon dioxide

This is why we burn fuels (such as paraffin, coal, propane and butane) for energy, because the chemical changes that take place during the reaction release huge amounts of energy, which we then use for things like power and electricity. You should also note that carbon dioxide is produced during this reaction. The chemical reaction that takes place when fuels burn has both positive and negative consequences. Although we benefit from heat, power and electricity the carbon dioxide that is produced has a negative impact on the environment.

Lightsticks or glowsticks are used by divers, campers, and for decoration and fun. A lightstick is a plastic tube with a glass vial inside it. To activate a lightstick, you bend the plastic stick, which breaks the glass vial. This allows the chemicals that are inside the glass to mix with the chemicals in the plastic tube. These two chemicals react and release energy. Another part of a lightstick is a fluorescent dye which changes this energy into light, causing the lightstick to glow! This is known as phosphorescence or chemiluminescence.

Answer:

A lake because it has more mass

Answer:

A lake at 10 degrees C

Explanation: Got it right on Edge 2020

Answer:

CACO3 is a precipitate. answer C definitely.

The chemical reaction that will produce a precipitate is:

C. [tex]Na_2CO_3+CaCl_2----- > CaCO_3+2NaCl[/tex]

Formation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion (a negatively charged ion). The solid that separates is called a precipitate.

Thus, out of the given options the option c will form a precipitate when sodium carbonate reacts with calcium chloride, calcium carbonate will form with a salt sodium chloride.

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