{3. 45cm+1. 270cm+0. 05cm}{34. 921cm}x{89cm}=______________x104cm3

Answer: 10 mg

Explanation:

First, take 17,190 divided by 5730 = 3 half-life

We know that after each half-life, the sample will decrease by half

80 mg = 0 half-life

40 mg = 1 half- life

20 mg = 2 half-life

10 mg = 3 half-life

a) Magnesium bubbles in acid: This is an example of a chemical property. Magnesium reacts with acid to produce hydrogen gas, which is observed as bubbles. The ability of magnesium to undergo a chemical reaction with acid is a characteristic of its chemical property.

b) The fireworks were gold and green: This is an example of a physical property. The color of fireworks is a visual characteristic that can be observed without changing the chemical composition of the fireworks. In this case, the physical property is the color of the fireworks, which appears as gold and green.

c) Alcohol boils at 60 degrees Celsius: This is an example of a physical property. Boiling point is a characteristic property of a substance, and in this case, the physical property is the boiling point of alcohol, which occurs at 60 degrees Celsius.

d) A nickel coin is shiny: This is an example of a physical property. Shiny or lustrous appearance is a visual characteristic of metals, including nickel. The ability of a substance to reflect light and appear shiny is a physical property.

e) Cars form rust: This is an example of a chemical property. Rust formation is a chemical reaction that occurs when iron or steel reacts with oxygen in the presence of moisture. The tendency of iron or steel to undergo corrosion and form rust is a chemical property.

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Answer:

Plants

Explanation:

Cooking any food.

Burning of wood.

Digestion of food.

Acid-base reaction.

Answer:

14 grams of calcium oxide would be produced by thermal decomposition of 25 grams of calcium carbonate.

Explanation:

You know:

CaCO₃ → CaO + CO₂

In the first place, by stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) the following quantities react and are produced:

Being:

the molar mass of the compounds participating in the reaction is:

Then, by stoichiometry of the reaction, the following mass amounts of the compounds participating in the reaction react and are produced:

You can then apply the following rule of three: if by stoichiometry of the reaction 100 grams of calcium carbonate CaCO₃ produce 56 grams of calcium oxide CaO, 25 grams of CaCO₃ how much mass of CaO will it produce?

\(mass of calcium oxide=\frac{25 grams of CaCO_{3} *56 grams of CaO}{100 grams of CaCO_{3} }\)

mass of calcium oxide= 14 grams

14 grams of calcium oxide would be produced by thermal decomposition of 25 grams of calcium carbonate.

ΔG, or Gibbs free energy change, is a useful quantity for predicting the favorability of biochemical reactions because it helps determine whether a reaction will occur spontaneously or not.

A negative ΔG indicates that the reaction is favorable and will proceed spontaneously, while a positive ΔG means that the reaction is unfavorable and requires an external input of energy to proceed.

Step-by-step explanation of why ΔG is important for predicting favorability:

1. ΔG combines the effects of enthalpy change (ΔH) and entropy change (ΔS) in a single value.

2. It takes into account both the energy required to break chemical bonds (ΔH) and the energy dispersed as a result of the increase or decrease in randomness (ΔS) during a reaction.

3. It is temperature-dependent, which allows for the prediction of reaction favorability under various environmental conditions.

4. It helps to identify whether a reaction is endergonic (requiring energy) or exergonic (releasing energy), which influences the need for coupling with other reactions.

5. In biochemical systems, many reactions are coupled and dependent on each other, so knowing the favorability of individual reactions helps to understand the overall metabolic pathways and their regulation.

In summary, ΔG is a crucial quantity in predicting the favorability of biochemical reactions, as it allows for a comprehensive understanding of the energy changes involved in the reaction process.

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I dont know but I am messaging because maybe someone else see it and help u :)

Comparing the energy of an electrostatic interaction between two ions bearing single opposite charges separated by 3 angstroms, the energy level of these ions in water is lower than that in hexane because the dielectric constant of water is higher than the dielectric constant of nonpolar solvent.

The dielectric constant of water is 80 whereas the dielectric constant of hexane is 2. the dielectric constant is a measure of the solvent's ability to decrease the Coulombic forces between ions or polar molecules. When two oppositely charged ions are placed in a solvent, their electrostatic attraction for one another may be reduced due to the presence of other ions and solvent molecules that mediate the interaction. The magnitude of this decrease is dependent on the dielectric constant of the solvent. A solvent with a high dielectric constant will more effectively screen electrostatic interactions than a solvent with a low dielectric constant. Water has a high dielectric constant due to its polar nature, whereas hexane has a low dielectric constant due to its nonpolar nature.

The energy level of these ions in water is lower than that in hexane because the dielectric constant of water is higher than the dielectric constant of nonpolar solvent.

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The molarity of the KCl solution is 4 M.

To prepare 50ml of 0.5M NaCl solution, the following steps should be taken:

Measure out 2.93g of NaCl and add it to a clean 50ml volumetric flask.

Add water to dissolve the salt and mix thoroughly, adding more water until the volume reaches the 50ml mark on the flask.

The molarity of the solution can be calculated using the following formula:

Molarity = (moles of solute) / (volume of solution in liters)

First, we must determine the number of moles of KCl in the solution. This can be accomplished using the formula:

n = m/M

where n is the number of moles,

m is the mass,

and M is the molar mass.

The molar mass of KCl is 74.55 g/mol.

To make 500ml of solution, 149.1g of KCl is used, so:

n = 149.1 / 74.55n = 2 moles

Now that we have the number of moles and the volume of the solution in liters,

we can calculate the molarity:

Molarity = 2 / 0.5L = 4 M

Therefore, the molarity of the KCl solution is 4 M.

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Answer: I believe it is 4

Explanation:

The mass of C in the 1.2359 g sample of the compound is 0.6116 g, the mass of N is 0.3564 g and the mass of O is calculated to be 0.2031 g.

First, we determine the mass of carbon C as follows;

mass of carbon C = (2.241 g) × (1 mole Carbon dioxide/44.01 g Carbon dioxide) × (1 mole C/ 1 mole Carbon dioxide) × (12.011 C/1 C)

mass of carbon C = 0.6116 g

Now the mass of nitrogen (N) can be determined as follows;

As the mass percent of N is found to be 28.84 % therefore;

Mass of nitrogen (N) = 1.2359 × 0.2884 = 0.3564 g

Now the mass of oxygen (O) can be calculated as follows;

Since the compound contains only C, H, N, and O therefore;

mass of O = g of sample − ( g of H + g of C + g of N )

mass of O = 1.2359 − (0.0648 + 0.6116 + 0.3564)

Mass of O = 0.2031 g

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Answer:

The solid crystals disappeared

Explanation:

When a soluble solid solute is added to water, the solid solute disappears after a little while. The disappearance of this solute indicates that the solute has been dissolved in water.

In this case, blue copper sulphate crystals are added to water, the blue crystals disappear leaving only a blue solution. The disappearance of these blue copper sulphate crystals indicates that the substance has dissolved in water.

2CaCO3 =2CaO+CO2 is balanced but we can change 2CaCO =2CaO3+C03

The purchase process involves steps such as initiating a request, vendor selection, approval, purchase order issuance, product delivery, and payment, ensuring a systematic approach to procurement for accountability and efficiency.

The purchase process consists of several steps:

1. The department admin initiates the process by sending a purchase request to the IT department.
2. The IT Manager reviews the request and decides whether to approve or reject it.
3. If the request is approved, the IT Manager contacts various vendors, such as Apple, Dell, HP, ASUS, and Lenovo, to request quotes.
4. The IT Manager receives the quotes and selects the best price.
5. Once the best price is selected, the IT Manager informs the admin and waits for their approval.
6. If the admin approves, the IT Manager finalizes the vendor selection and prepares the purchase request.
7. The IT Manager then sends the purchase request to the Procurement Supervisor.
8. The Procurement Supervisor receives the request and issues a purchase order to the chosen vendor.
9. The Procurement Supervisor reviews the vendor's invoice and processing time.
10. If the processing time elapses and the tracking number has not been received, the Procurement Supervisor cancels the order.
11. If the vendor provides the tracking number within the processing time, the Procurement Supervisor collects the product once it is delivered.
12. At the same time, the Procurement Supervisor submits the payment to the vendor.
13. Once both steps are completed, the purchase process is considered finished, and the purchase is completed.

This process ensures that there is a clear and systematic approach to purchasing items, from the initial request to the final delivery and payment. Each step is important in maintaining accountability and efficiency in the procurement process.

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Answer:

10 pounds

Explanation:

If the moon has 1/6 the gravity of earth, divide your weight on earth by 6 to find your weight on the moon

60 / 6 = 10 pounds

Answer:

The heavier the molecules, the slower they move - the lighter the molecules, the faster they move. Nitrogen molecules weigh about 28 units. Chlorine molecules weigh 71 units. So we would expect nitrogen to diffuse more quickly than chlorine.

Answer:

Nitrogen weights 28 units and chlorine is 71 units . In that case nitrogen will diffuse faster

The empirical formula of the molecule is CH2.

To determine the empirical formula, we need to find the simplest whole-number ratio of the atoms in the molecule. We can assume 100 grams of the molecule since percentages are given by mass.

To find the ratio, we need to divide the masses of each element by their respective atomic masses and then divide the result by the smallest value obtained:

The smallest value is 7.14 mol, so we divide both values by 7.14:

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Answer:

C. Lead(IV) Chloride

Explanation:

Because PbCl4 has a transition metal we need to indicate the ionic charge using Roman numerals in parenthesis. This is placed directly after the metal.

The name of PbCl₄ is lead (IV) chloride. Therefore, option C is correct.

Lead (IV) chloride (PbCl₄) is a hypothetical compound, it does not exist under normal conditions. The highest oxidation state that lead typically exhibits is +4, but it is highly unstable and tends to be disproportionate to lower oxidation states.

Lead commonly forms compounds such as lead (II) chloride (PbCl₂), where lead has an oxidation state of +2. In PbCl₂, each lead atom is bonded to two chloride ions. This is the most stable and commonly observed form of lead chloride.

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Answer:

45 grams

Explanation:

Taking into account the Newton's second law, the correct answer is option A. F = 9.68 N right

In first place, acceleration in a body occurs when a force acts on a body.

Newton's second law states that a force will change the speed of an object because the speed and/or direction will change. These changes in velocity are called acceleration.

So, Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object

Mathematically, Newton's second law is expressed as:

F= m×a

where:

In this case, you know:

Replacing in Newton's second law:

F= 2.2 kg× 4.4 m/s²

Solving:

F= 9.68 N

Finally, As the bowl of fruit accelerates to the right, the correct answer is option A. F = 9.68 N right

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Answer:

Nonmetal...

Explanation:

T^T

Answer: its a nonmetal

Explanation: you can look up a group divided periodic table to show the groups of different elements.

Answer:

here.

Explanation:

molar absorptivity, path length of cuvette, test tube, and concentration.

The factor that is most sensitive to changes in temperature is the fraction of molecules with energy greater than the activation energy.

The statement that best represents the effect of temperature on reaction rates is called the Arrhenius equation. It is expressed as \(k = Ae^{-Ea/RT},\)

where k is the rate constant,

A is the pre-exponential factor or frequency factor,

Ea is the activation energy,

R is the gas constant, and T is the absolute temperature.

At high temperatures, the reaction rate increases, and at low temperatures, the reaction rate decreases.

The Arrhenius equation shows that the rate constant depends on two factors:

the activation energy and the fraction of molecules with energy greater than the activation energy.

Thus, the most sensitive factor to changes in temperature is the fraction of molecules with energy greater than the activation energy.

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The daily decay rate of the substance is approximately 0.793 (rounded to 3 decimal places).

The half-life of the material = 3 days To calculate:

The daily decay rate of the substance Formula used:

1/2^(t/h), where t = time elapsed and h = half-life of the substance Solution:

The formula for calculating the daily decay rate of the substance is given by:

1/2^(t/h)Where t is the time elapsed and h is the half-life of the substance.

The daily decay rate of the substance is calculated as follows:1/2^(1/3) ≈ 0.793.

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Answer:

C

Explanation:

Answer:

temperature

Explanation:

increase in temperature increases the rate of reaction

Answer:

7

Explanation:

Taking into account the definition of density, the mass of the liquid is 81.435 grams.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it measures the amount of mass in a given volume of a substance.

The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

In this case, you know that:

Replacing in the definition of density:

2.67 g/cm³= mass÷ 30.5 cm³

Solving:

mass= 2.67 g/cm³× 30.5 cm³

mass= 81.435 g

In summary, the mass of the liquid is 81.435 grams.

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