The measured mass of a sample would have which of the following units?Group of answer choicesg/mlg/moleg/cmgcm

The enthalpy of this reaction is 1.48 kJ/mol.

The formula to calculate heat energy is

Q = m × c × ΔT

ΔT = T₂ - T₁

ΔT = T₂ - T₁ = 24.70 - 21.00 = 3.70 °C

Q = m × c × ΔT

Q = 191 × 4.184 × 3.70

Q = 2,956.83 J

Q = (2,956.83 ÷ 1,000) kJ

Q = 2.96 kJ

The enthalpy ΔH = Q ÷ n

ΔH = Q ÷ n

ΔH = 2.96 ÷ 2.00

ΔH = 1.48 kJ/mol

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Copper atoms (Cu) were created by reducing copper ions (Cu2+). An illustration of a reduction reaction is this. (Mg2+).To create Mg2+ ions, Mg atoms lost their electrons. An example of an oxidation reaction is this.

Oxidation and reduction occurred in test tube 5. Here is the equation for the reaction that took place:MgSO4 (aq) + Cu (s) CuSO4 (aq) + MgCuSO4's blue hue was neutralised to a solid copper hue. Copper atoms (Cu) were created by reducing copper ions (Cu2+). An illustration of a reduction reaction is this. Cu atoms are created when Cu2+ gains electrons. Due to the presence of magnesium ions (Mg2+), the solution was greenish-yellow.To create Mg2+ ions, Mg atoms lost their electrons. An example of an oxidation reaction is this. Two electrons were lost by the magnesium atom, leaving two electrons behind.

As a result, test tube 5 experienced both oxidation and reduction.It is possible to prove that oxidation, reduction, or both took place through the reaction's electron transfer and colour changes. A reduction reaction was seen when copper ions transformed into copper atoms. An oxidation reaction was evident when magnesium atoms transformed into magnesium ions.

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To solve this problem using the gas laws, we need to use the Ideal Gas Law. This law states that the product of the pressure and the volume of a gas is proportional to the absolute temperature.

The equation of the Ideal Gas Law is the following:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{\dfrac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2} } \end{gathered}$} }\)

Where:

We clear for V₂:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{P_1V_1T_2}{P_2T_1 } } \end{gathered}$} }\)

Where:

Substituting the known values:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{760\not{kPa}\times0.050 \ L\times20.0\not{k} }{ 380\not{kPa}\times10.0\not{k} } } \end{gathered}$} }\)

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{760 \ L}{3800 } } \end{gathered}$} }\)

\(\boxed{\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2\approx0.2 \ Liters} \end{gathered}$} }}\)

When you increase the amount of carbon dioxide in the atmosphere, you also increase the amount of carbonic acid in the ocean.

Carbon dioxide is absorbed from the atmosphere into the ocean through a process called "oceanic uptake," which is facilitated by the exchange of gases at the air-sea interface.

As more carbon dioxide is emitted into the atmosphere, the concentration of carbon dioxide in the ocean increases, leading to a phenomenon called "ocean acidification".

Ocean acidification can have a number of negative impacts on marine organisms, including reduced growth rates and weakened shells or skeletons.

Thus, we can conclude this increases the amount of carbonic acid in ocean.

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The types of molecules of the substance before and after the chemical change are different, and the change was exothermic.

The correct answer is option D.

We call this an endothermic reaction. The emission of light from a very hot substance is called incandescence. Many chemical reactions give off light and/or heat. A familiar example of a chemical reaction that gives off both heat and light is the combustion of propane in a gas stove or BBQ.

Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products that are used to break the bonds in the reactants. Exothermic reactions are accompanied by an increase in the temperature of the reaction mixture.

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If there is sufficient fossil fuel, we will cope by utilizing it in a responsible and sustainable manner while actively transitioning towards alternative energy sources. Coping with the abundance of fossil fuels requires a multi-faceted approach that considers environmental, economic, and social aspects.

To cope effectively, we can:

1. Promote energy efficiency: Invest in technologies and practices that minimize energy waste and maximize efficiency in all sectors, including transportation, industries, and buildings.

2. Transition to renewable energy: Increase the adoption of renewable energy sources such as solar, wind, hydro, and geothermal power. This reduces our reliance on fossil fuels and mitigates environmental impacts.

3. Implement policy measures: Enact policies that incentivize the use of renewable energy, discourage excessive fossil fuel consumption, and promote sustainable practices.

4. Invest in research and development: Support and fund research efforts aimed at developing cleaner and more sustainable energy technologies, such as advanced battery storage, hydrogen fuel cells, and carbon capture and storage.

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From the question;

1) The enthalpy  is  544 kJ/mol

2) The enthalpy is -110 kJ/mol

3) The enthalpy is -425 kJ/mol

4) The enthalpy is  425 kJ/mol

Bond energy, sometimes referred to as bond dissociation energy or bond strength, is the amount of energy needed to completely dissociate the bound atoms and break a chemical bond. It expresses the potency of the attraction forces that hold the atoms together and measures the stability of a chemical bond.

The enthalpy of the reaction is obtained from;

Enthalpy of reaction = Sum of bond energy of products - Sum of bond energy of reactants

1) 2(565) - [432 + 154]

= 544 kJ/mol

2) [2(799) + 2(467)] - [(4 * 413) + 2(495)]

(1598 + 934) - (1652 + 990)

2532 - 2642

= -110 kJ/mol

3) 2(467) - [2(432) + (495)]

934 - 1356

= -425 kJ/mol

4) [2(432) + (495)] - 2(467)

= 425 kJ/mol

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Answer:

E,A,D i beleve

Explanation:

im pretty sure thats what it is

A 10.0 g-sample of liquid water absorbs 50 cal of energy when its temperature increases from 13 °C to 18 °C.

Heat is a form of energy resulting from the difference in temperature between two bodies.

A sample of water initially at 13 °C, absorbs energy in the form of heat and its temperature increases to 18 °C.

We can calculate the amount of heat absorbed using the following expression.

Q = c × m × ΔT

Q = 1.0 cal/g°C × 10.0 g × (18 °C - 13 °C) = 50 cal

where,

A 10.0 g-sample of liquid water absorbs 50 cal of energy when its temperature increases from 13 °C to 18 °C.

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Answer:

The traditional vision of the role science should play in policy making is of a two stage process of scientists first finding out the facts, and then policy makers making a decision about what to do about them.

Explanation:

Answer:

Yes!  It's because of like freezing and or solidification. It's the phase transition in which a liquid turns into a solid. It's when the temperature is lowered to or below a type of  freezing point.

Explanation:

The concentration of CO2 in club soda is approximately 1.1964 g/L.

To find the concentration of CO2 in club soda, we need to use the stoichiometry of the reaction and the volume and concentration of the NaOH solution used.

The balanced equation for the reaction is:

CO2(aq) + 2NaOH(aq) → Na2CO3(aq)

From the stoichiometry of the equation, we can see that 1 mole of CO2 reacts with 2 moles of NaOH. Therefore, the moles of CO2 can be calculated using the volume and concentration of NaOH solution used.

Given that 32.14 mL of 0.04202 M NaOH solution was used, we can calculate the moles of NaOH:

moles of NaOH = volume (L) × concentration (M)

moles of NaOH = 32.14 mL × 0.04202 mol/L

moles of NaOH = 0.001351 mol

According to the stoichiometry of the equation, 1 mole of CO2 reacts with 2 moles of NaOH. Therefore, the moles of CO2 can be calculated as:

moles of CO2 = (moles of NaOH) / 2

moles of CO2 = 0.001351 mol / 2

moles of CO2 = 0.0006755 mol

Now, we need to convert the moles of CO2 to grams. The molar mass of CO2 is approximately 44.01 g/mol.

mass of CO2 = moles of CO2 × molar mass of CO2

mass of CO2 = 0.0006755 mol × 44.01 g/mol

mass of CO2 = 0.02979 g

Finally, we need to express the concentration of CO2 in club soda in g/L. We are given that the sample of club soda used is 25.00 mL.

concentration of CO2 = (mass of CO2) / (volume of club soda in L)

concentration of CO2 = 0.02979 g / (25.00 mL × 0.001 L/mL)

concentration of CO2 = 1.1964 g/L

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Answer:

“Rams Caught in a Thicket” as an allusion to the biblical story of Abraham. They more likely represent goats, which could often be seen standing on their hind legs, to reach leaves in the trees, as seen here.

Answer:

B. PROTONS EXHIBIT STRONGER PULL ON OUTER f ORBITALS

Explanation:

Lanthanide contraction is the greater than normal decrease in the ionic radius of the lanthanide series from atomic number 57 to atomic number 71. This decrease is rather not expected of the ionic radii of these elements and they result in the greater decrease in the subsequent series of the lanthanides from the atomic number 72. The cause of which is as a result of the poor shielding effects of the nuclear charge around the electrons of the f orbitals. So therefore, protons are strongly pulled out of the 4f orbital and as a result of the poor shielding effect which causes the electrons of the 6s orbitals to be drawn more closer to the nucleus and hence resulting in a smaller atomic radii. It is worthy to note that the shielding effects of the inner electrons decreasing from s orbital to the f orbital; that is s > p > d > f. So from the decrease in the shielding effects from s to the f orbitals, lanthanide contraction results from the inability of the orbitals far away from s like the 4f orbiatls to shield the outermost shells of the lanthanide elements. So the cause of lanthanide contraction is the action of the protons which strongly pull the electrons of the f orbitals because of the poor shielding effects due to the distance of this orbital from the nucleus.

Answer:

B) Protons exhibit a stronger pull on outer f orbitals than on d orbitals.

Explanation:

Chemistry => Kinetics => Reaction Rate

The reaction rate corresponds to the speed with which the reactants are consumed, or in other words the speed with which the products are formed.

From the graph, we can calculate the reaction rate by dividing the volume of products by the time. So, the reaction rate will be:

Answer: D. 1.33 cm3/s

Answer:

\(\boxed {\boxed {\sf 38.11 \ L}}\)

Explanation:

To find the volume, we need to convert grams to moles, then moles to liters.

We convert grams to moles using the molar mass. This is the mass of 1 mole of a substance. It is the same as the atomic mass found on the Periodic Table, but the units are grams per mole (not atomic mass units).

We have the compound carbon dioxide or CO₂. Look up the molar masses of the individual elements.

Notice that oxygen has a subscript of 2, so there are 2 atoms in each molecule. We have to multiply oxygen's molar mass by 2 before adding carbon's.

Use this value as a ratio.

\(\frac {44.009 \ g\ CO_2}{1 \ mol \ CO_2}\)

Multiply by the given number of grams: 74.87

\(74.87 \ g\ CO_2*\frac {44.009 \ g\ CO_2}{1 \ mol \ CO_2}\)

Flip the ratio so the units of grams cancel.

\(74.87 \ g\ CO_2*\frac {1 \ mol \ CO_2}{44.009 \ g\ CO_2}\)

\(74.87 *\frac {1 \ mol \ CO_2}{44.009 }\)

\({74.87 \ mol \ CO_2}{44.009 } = 1.701242928 \ mol \ CO_2\)

Any gas at standard temperature and pressure (STP) has a volume of 22.4 liters per mole.

\(\frac {22.4 \ L}{1 \ mol \ CO_2}\)

Multiply by the number of moles we calculated.

\(1.701242928 \ mol \ CO_2*\frac {22.4 \ L}{1 \ mol \ CO_2}\)

The units of moles cancel.

\(1.701242928 *\frac {22.4 \ L}{1 }\)

\(1.701242928 *{22.4 \ L}= 38.10784158 \ L\)

The original measurement has 4 significant figures, so our answer must have the same. For the number we calculated, that is the hundredth place.

The 7 tells us to round the 0 10 a 1.

\(38.11 \ L\)

Answer:

A test variable is a user-defined, name-value pair that stores and refers to information throughout a test and between tests. For example, in a study looking at how tutoring impacts test scores, the dependent variable would be the participants' test scores, since that is what is being measured...

The control group is defined as the group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do. For example, The control group is used in an experiment as a way to ensure that your experiment actually works. Your experimental group would be given the Gatorade and your control group would be given regular water. The conditions must be exactly the same for all members of the experiment.

A limiting factor is anything that constrains a population's size and slows or stops it from growing. Some examples of limiting factors are biotic, like food, mates, and competition with other organisms for resources. Limiting factors are usually expressed as a lack of a particular resource.

Infectious agents commonly spread through the direct transfer of bacteria, viruses, or other germs from one person to another. This can happen when an individual with the bacterium or virus touches, kisses, or coughs or sneezes on someone who isn't infected.

Explanation:

Molar concentration of Zn2+ions in a solution is 3.481 mol/lit

The electrode potential value is 59mV

Temperature=298k

What is electrode potential?

equation formed- Zn → Zn2+ + 2e

              from Nernst equation-

E=E cell - 0.059 log [Zn2+]

[zn2+]=3.481 mol/lit

hence, Molar concentration of Zn2+ions in a solution is 3.481 mol/lit

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Answer:

1. A scientist conducts and gathers research to gain knowledge in a particular area.

2. Many of the worlds problems include resources, energy, health, environment, climate, transportation, communication, etc. and will require solutions from science and engineering.

Answer: A hydrogen bonded to an oxygen is more “attractive” than a carbon bonded to an oxygen. So, water molecules are “stickier” than ethanol molecules – making it easier for water molecules to get “stuck”.

Explanation:

The number of moles of gas occupies 347.8 mL, at 4.369 x 10 atm at 25 degrees C. is 0.0041843391.

The mole is the amount of substance in a system that contains the same number of elementary entities as there are atoms in 0.012 kilograms of carbon 12; it is denoted by the symbol "mol."

The mole, symbol mol, is the SI unit of the material amount of a specified elementary entity, which may be an atom, molecule, ion, electron, any other particle, or a specified group of such particles; its magnitude is set by fixing the numerical value of the Avogadro constant to be exactly 6.022 141 29 1023 when expressed in the SI unit mol-1.

We can use the Ideal Gas Law to solve this problem.

PV = nRT

where,  Atmosphere pressure P is 4.369 x 10 atm.

Volume V must be expressed in liters, so it will be 0.347.8 L,

and n is the number of moles(n) (and its unknown in this particular question)

R is the universal gas constant (R =.08206 L a t m L/ m o l K ).

T is the temperature in degrees Celsius (degree  C + 273 = K, so 25 degrees C + 273 = 298. K).

So we can say,

n = 0.3478*43.49/298*0.08206

n(mole) = 0.0041843391

The number of moles of gas occupies 347.8 mL, at 4.369 x 10 atm at 25 degrees C is 0.0041843391.

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Answer:

The number of these organisms in the soil would decrease.

Explanation:

Answer:

D The number of protons

Students put solid butter and solid water on a table. The air temperature around the table is 20°C. After two hours, The butter will remain a solid, and the water will become a liquid. Therefore, option B is correct.

A state of matter is one of the various forms that matter can take. In everyday life, four states of matter are visible: solid, liquid, gas, and plasma.

On a table, students placed solid butter and solid water. The temperature of the air around the table is 20°C. The butter will remain solid after two hours, while the water will become liquid.

Thus, option B is correct.

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Your question is incomplete, most probably your question was

The pictures show butter and water in solid states. The melting point of each substance is shown.

Students put solid butter and solid water on a table. The air temperature around the table is 20°C.

A. The butter and water will both become liquids.

B. The butter will remain a solid, and the water will become a liquid.

C. The butter and water will both remain solids.

D. The butter will become a liquid, and the water will remain a solid.

Explanation:

How Fireworks operate

Fireworks contain an explosive powder, along with a binding paste, mixed with the signature chemicals responsible for its bright colors. ... The wavelength, and so the color of the light emitted, is fixed by these energy differences, giving each substance a "fingerprint" line emission spectrum. When the fireworks explode, electrons within the atoms of these different elements absorb energy and get “excited” which causes them to move into the higher energy orbits. When they come down to lower energy orbits, photons are released which allow us to see the great colors during a fireworks show. The electrons of the aluminum atoms absorb heat energy and become excited. The excited energy level the of electrons are energy level 2 or n=2 and above. ... Then electrons of lose the energy and fall back down to ground state which at energy level .This is also how a firework works on an atomic level.

Hope it helps :)

Look at the mole ratio in the balanced equation

2CO + O2 ==> 2CO2

3.44 mol O2 x 2 mol CO/mol O2 = 6.88 moles CO

It is accurate what is said about membranes below: an enzyme-mediated mechanism is mostly responsible for lateral diffusion.

A substance can be either hydrophobic or hydrophilic. Given that the word "hydr" is derived from the Greek word "hydor," which means "water," hydrophobic materials are "water-fearing" and do not blend with water, whereas hydrodynamic materials are "water-loving" and have a propensity to become wetted by water.

Non-polar substances with a low affinity for water are referred to as hydrophobic substances and are water-repellent. As opposed to a hydrophobic interaction, which is indicated by a contact angle larger than 90°, a hydrophilic interaction is indicated by a contact angle less than 90°.

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The Lewis structure of ammonia, NH

3

, would be three hydrogen-bonded to a nitrogen atom in the middle, with a lone pair of electrons on top of the atom. This is the reason why ammonia acts as a Lewis base, as it can donate those electrons.

solution

OPTION 3 IS THE ANSWER