How will you prepare hydrogen from zinc and dilute acid.​

Answer:

1. 2.63x10^6

2. 39.2

Both answers have been rounded

Answer:

They atoms move around a lot and they are spread out, unlike the atoms in a cold object. The atoms in a cold object are compacted and only move a slight amount.

Answer: The volume of the solution is 85.7 mL

Explanation:

Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:

\(\text{Molarity of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (mL)}}\) .....(1)

We are given:

Molarity of solution = 0.600 M

Given mass of \(BaSO_4\) = 12.00 g

We know, molar mass of \(BaSO_4=[(1\times 137.33)+(1\times 32.07)+(4\times 16)]=233.4g/mol\)

Putting values in equation 1, we get:

\(0.600=\frac{12.00\times 1000}{233.4\times \text{Volume of solution}}\\\\\text{Volume of solution}=\frac{12.00\times 1000}{233.4\times 0.600}=85.68mL=85.7mL\)

The rule of significant number that is applied for the problems having multiplication and division:

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

Here, the least number of significant figures is 3 that is determined by the number, 0.600. Thus, the answer must have these many significant figures only.

Hence, the volume of the solution is 85.7 mL

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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\(HELLO!\)

To completely describe an electron in an atom, four quantum numbers are needed:

                                          \(MiraculousAlejandra\).

Answer:

in science a lot as a general statement that explains a large number of observations before being accepted a llama be verified many times under many conditions law are therefore considered the highest form of scientific knowledge and are generally thought to be inviolable scientific laws for form the core of scientific knowledge 1 scientific law that provides the foundation for understanding in chemistry is the law of conservation of matter states that in any given system that is closed the transfer of matter in an out the amount of matter in the system stays constant the concise way of expressing this law is to say that the amount of matter in a system is conserved

Acetylsalicylic acid, is the active ingredient in aspirin. 68 is the number of valence electrons are present in the lewis structure for this molecule.

A valence electron is an electron that is part of an atom's outer shell in chemistry and physics. If the outer shell is open, the valence electron can take part in the formation of a chemical bond. Each atom in the bond contributes one valence electron, forming a shared pair in a single covalent bond. The chemical properties of an element, such as its valence—whether it can connect with other elements and, if so, how quickly and with how many—may be affected by the existence of valence electrons.

C =4 valence electrons.

H = 1 valence electron.

O=6 valence electrons.

9 C x 4 valence electrons = 36 valence electrons

8 H x 1 valence electron = 8 valence electrons

4 O x 6 valence electrons = 24 valence electrons

Total valence electrons = 36 + 8 + 24 = 68

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The number of moles in 583g of H2SO4 in 1.50 kg of water is 9.33 moles.

To calculate the number of moles, we need to use the formula:

moles = mass (in grams) / molar mass (in grams/mol)

Step 1: Calculate the molar mass of H2SO4

H2SO4 is composed of 2 hydrogen atoms (H), 1 sulfur atom (S), and 4 oxygen atoms (O). We can find the molar mass by adding up the atomic masses of each element:

(2 * atomic mass of H) + atomic mass of S + (4 * atomic mass of O)

Step 2: Calculate the molar mass of H2SO4

(2 * 1.01 g/mol) + 32.07 g/mol + (4 * 16.00 g/mol) = 98.09 g/mol

Step 3: Calculate the number of moles

moles = mass / molar mass

moles = 583 g / 98.09 g/mol ≈ 5.95 moles

However, we need to consider that the H2SO4 is dissolved in 1.50 kg (1500 g) of water. Assuming H2SO4 is completely ionized, it dissociates into 2 H+ ions and 1 SO4^2- ion. Therefore, the number of moles of H2SO4 will be twice the number of moles calculated in Step 3.

moles = 5.95 moles * 2 = 11.9 moles

However, we have to keep in mind that we are calculating the moles of H2SO4 dissolved in water, which is the acid solution used in an automobile battery. Hence, the final answer is rounded to two decimal places: 9.33 moles.

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If the following elements are arranged by increasing atomic radius (from smallest to largest); F, B, Be, O, the correct order would be...F<O<B<Be.

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British thermal units (Btu) are a unit used to measure the amount of heat in fuels or other energy sources.

The amount of heat needed to raise a pound of liquid water's temperature by one degree Fahrenheit at the point where water has its highest density (approximately 39 degrees Fahrenheit).

Temperature is a physical parameter that, with the aid of a certain scale, indicates the kinetic energy and amount of energy transfer from an object or an entity to its environment (surrounding). Different temperature sensors, such as thermocouples, thermistors, and digital temperature sensors, can be used to control or maintain the temperature.

A unit of measurement that shows the amount of energy or heat required to raise the temperature associated with an object's hotness.

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"Water is an effective solvent for living systems because of its inert behavior" is not entirely accurate.

Water is considered an effective solvent for living systems because of its ability to dissolve various types of molecules such as salts, sugars, and proteins. This is due to the polarity of water molecules and the hydrogen bonding between them. Additionally, water is not completely inert as it can participate in chemical reactions, such as hydrolysis and dehydration synthesis. Therefore, it is the combination of water's polarity and reactivity that make it an effective solvent for living systems. These characteristics make water a crucial component in living systems, as it can facilitate various biochemical reactions and transport essential nutrients and waste materials.

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Answer:

- One mole of oxygen was used in this reaction.

- Two moles of water were produced from this reaction.

Explanation:

In addition: - Two moles of hydrogen were used.

Given the data from the question, the correct statement is:

To know which options are correct, we shall determine the number of mole of O₂ used and the number of mole of H₂O produced.

Balanced equation

2H₂ + O₂ —> 2H₂O

From the balanced equation above,

2 moles of H₂ required 1 mole of O₂

Therefore,

1 mole of H₂ will require = 1 / 2 = 0.5 mole of O₂

Thus, 0.5 mole of O₂ is needed for the reaction

From the balanced equation above,

2 moles of H₂ reacted to produce 2 moles of H₂O

Therefore,

1 mole of H₂ will also react to to produce 1 mole of H₂O

Thus, 1 mole of H₂O was produced from the reaction.

SUMMARY

When 1 mole of H₂ was used in the reaction,

Considering the options given in the question above, the correct statement is:

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L1 and L2 can be separated by the process of fractional distillation and L2 and L4 can be separated by the process of separation.

The method for separating crude oil into clusters of hydrocarbons with similar numbers of carbon molecules is known as fractional distillation. These groups of hydrocarbons are referred to as "fractions." Hydrocarbons with short chains. Short-chain hydrocarbons are hydrocarbons with few carbon atoms.

Fractional distillation is used to purify water as well as separate ethanol and water. Fractional distillation is used in many industries, including oil refineries and chemical plants, to purify and separate many organic compounds.

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I understand the question you are looking for :

1. The table below shows liquids that are miscible and those that are immiscible

Liquid L3 L4

L1 Miscible Miscible

L2 Miscible Immiscible

Use the information given in the table to answer that questions that follow;

i) Name the method that can be used to separate L1 and L2 from a mixture of the two

ii) Describe how a mixture of L2 and L4 can be separated

Answer:

Here’s an example:

CH (methylene) is the empirical formula.

C2H2 is a molecular formula. It is a gas called Ethyne.

C8H8 is an oily liquid called Styrene. It is also a molecular formula.

Now compare: even though the empirical formula for these compounds is the same, they have different molecular formulas and different properties.

Explanation:

Some background information:

The empirical formula is the formula with the lowest whole number ratio of an element in a compound. A molecular formula is the chemical formula of a (molecular) compound. The molecular formula gives us the exact number of atoms or moles in that compound.

I have attached pictures for a better understanding of the empirical formula.

Answer:

Particles move faster the farther they are apart, so the container with the most spread out particles.

Answer:

\(\boxed {\boxed {\sf A. \ 19,320 \ kg/m^3}}\)

Explanation:

We want to find the density. The formula is mass over volume.

\(\rho = \frac{m}{v}\)

The mass is 500 kilograms. The volume is 0.026 cubic meters.

\(m= 500 \ kg \\v=0.026 \ m^3\)

Substitute the values into the formula.

\(\rho= \frac{ 500 \ kg}{ 0.026 \ m^3}\)

Divide.

\(\rho = 19230.7692 \ kg/m^3\)

This is just about equal to 19,320 kg/m³, so choice A is correct.

Answer:

A) 19230 kg/ m3

Explanation:

divided it's mass by its volume ti get it's density

500/0.026 = 19230

The number of moles of solute in 2.90 L of 2.90 x 10⁻³ M KMnO₄ is 8.41 mmol. The number of millimoles of solute in 0.4500 L of 0.0401 M KSCN is 18.0 mmol. The number of millimoles of solute in 570.0 mL of a solution containing 2.28 ppm CuSO₄ is 8.15 x 10⁻³ mmol.

a. 2.90 L of 2.90 x 10⁻³ M KMnO₄

The formula to find the number of moles of solute is: moles = Molarity x Volume in Liters

Therefore, the number of moles of solute in 2.90 L of 2.90 x 10⁻³ M KMnO₄ is = 2.90 x 2.90 x 10⁻³ = 0.00841 = 8.41 x 10⁻³ moles = 8.41 mmol (rounded to 2 significant figures)

b. 450.0 mL of 0.0401 M KSCN

Use the same formula:

moles = Molarity x Volume in Liters.

The number of moles of solute in 0.4500 L of 0.0401 M KSCN is = 0.0401 x 0.4500 = 0.0180 moles = 18.0 mmol (rounded to 2 significant figures)

c. 570.0 mL of a solution containing 2.28 ppm CuSO₄

The concentration of CuSO₄ is given in ppm, so we first convert it into moles per liter (Molarity) as follows:

1 ppm = 1 mg/L

1 g = 1000 mg

Molar mass of CuSO₄ = 63.546 + 32.066 + 4(15.999) = 159.608 g/mol

Thus, 2.28 ppm of CuSO₄ = 2.28 mg/L CuSO₄

Now, we need to calculate the moles of CuSO₄ in 570 mL of the solution.

1 L = 1000 mL

570.0 mL = 0.5700 L

Using the formula, moles = Molarity x Volume in Liters

Number of moles of solute = 2.28 x 10⁻³ x 0.5700 / 159.608 = 8.15 x 10⁻⁶ = 8.15 x 10⁻⁶ x 1000 mmol/L (since 1 mole = 1000 mmol) = 8.15 x 10⁻³ mmol

Therefore, 570.0 mL of a solution containing 2.28 ppm CuSO₄ contains 8.15 x 10⁻³ mmol (rounded to 2 significant figures) of solute.

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The mass of KCl in 350 mL of 0.24 M KCl is 6.23 g.

To calculate the mass of KCl in 350 mL of 0.24 M KCl, we need to use the formula:
Mass = concentration (in mol/L) x volume (in L) x molar mass (in g/mol)
First, let's convert the given volume in mL to L by dividing by 1000:
350 mL = 0.35 L
Next, we need to find the molar mass of KCl, which is the sum of the atomic masses of potassium (K) and chloride (Cl):
Molar mass of KCl = 39.10 g/mol (K) + 35.45 g/mol (Cl) = 74.55 g/mol
Now, we can substitute the values into the formula:
Mass = 0.24 mol/L x 0.35 L x 74.55 g/mol = 6.23 g
Therefore, the mass of KCl in 350 mL of 0.24 M KCl is 6.23 g. The closest answer choice is E) 6.3 G.

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Answer:

Nobody cares

Explanation:

Cause nobody cares hope this helps

Answer:

Part 1 calcium and strontium have same properties as magnesium because all three are in same group.

Part 2 As atomic number of potassium is 19 so it contains 19 protons and 19 electrons because it is neutral

Potassium has 20 neutrons because its mass is 39

We can find neutron = atomic mass - atomic number

Explanation:

Answer:

Number 6 is correct all substances are made of molecules.

Explanation:

A molecule is a formation of atoms or a chemical and all substances are made of chemicals.

The given statement all known substances are made of molecules is correct. Therefore, option (d) is correct.

All known compounds in chemistry are made up of different kinds of molecules. A compound contains atoms or ions of two or more elements in fixed proportions joined with each other by bonds into a molecule. Molecules are formed when atoms are joined through chemical bonds.

Any molecule that contains atoms of two or more different elements is known as a compound. All the compounds are written into formulas that present the chemical elements from the periodic table combined.

When the atoms of a particular element combine, some individual property of that chemical element is lost. The newly formed compound shows some new properties.

All the compounds or known substances have a chemical formula. These compounds can be divided into two kinds, molecular compounds, and salts.

Some examples of substances made of molecules such as water have molecules of H₂O, hydrogen peroxide H₂O₂, etc.

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To prepare 240 mL of two-thirds strength hydrogen peroxide solution for a wound irrigation using normal saline as the diluent, you need to mix 160 mL of full-strength hydrogen peroxide with 80 mL of normal saline.

This creates a total volume of 240 mL, with two-thirds of it being hydrogen peroxide and one-third being normal saline.

When using a hydrogen peroxide solution for wound irrigation, it is important to ensure that the concentration of the solution is appropriate for the type of wound being treated. Generally, hydrogen peroxide solutions of 2-3% concentration are used for wound irrigation. Higher concentrations can cause tissue damage and skin irritation.

Additionally, it is important to ensure that the diluent used is appropriate for the type of wound being treated. For example, normal saline is most commonly used for wound irrigation, but other diluents such as sterile water may be used for different types of wounds.

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amount of time the two substances are in contact. area in contact between the two substances. specific heat of the material that makes up the substances. the density of the two substances in contact.

The characteristics determine how easily two substances change temperature is amount of time the two substances are in contact, area of contact between the two substances, specific heat of the material that makes up the substances and the density of the two substances in contact. Therefore, option B, C, D and E are correct.

When two substances that have different surface temperatures come in contact, conduction happens. The substance with the higher temperature always transfers energy to the one with the lower temperature.

When two objects with different temperatures come in contact with one another, energy moves from the hotter (higher temperature) object to the cooler (lower temperature) object until both objects reach the same temperature.

The latitude of the location has an impact on the air temperature there. The location's elevation. separation from the ocean.

Thus, option B, C, D and E are correct.

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Carlos likes to bowl. He timed how long it took his ball to travel the length of the bowling alley's 18-meter lane. The ball will travel 12 m far after it had travelled for 2 s.

Length can be defined as a term used for identifying the size of an object and distance travelled by the object from one point to another point.

The S.I. unit of length is meter.

It can also be defined as the amount of time that something can last.

Thus, Carlos likes to bowl. He timed how long it took for his ball to travel the length of an 18-m lane in the bowling alley. The ball will travel 12 m far after it had travelled for 2 s.

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Your question is incomplete but most probably your full question was

Carlos likes to bowl. He timed how long it took for his ball to travel the length of a an 18-m lane in the bowling alley. He plotted the final distance and time on a line graph. Carlos drew a line from this point to the origin of the graph.

How far down the lane was the ball after it had traveled for 2 s?

6 m

9 m

12 m

18 m

Answer:

Positive feedback

Explanation:

If the temperature on Earth starts to lower then a "positive feedback" will start to begin trying to make Earth heat up.

Clouds can trap that heat from the Sun therefore the clouds wrap Earth in a blanket. Therefore clouds have both a cooling effect as well as a warming effect.

Solar radiation makes it from our sun to the Earth and through the atmosphere. Solar radiation refers to electromagnetic waves or light. Solar radiation comes in three major classes: visible light, infrared light, and ultraviolet light.

The full electromagnetic spectrum features 7 types of light from lowest frequency to highest: radio waves, microwaves, infrared light, visible light, UV light, X-rays, and γ-rays. The ozone layer in the atmosphere prevents the passage of UV light through it.

The human eyeball can only detect visible light. The ultraviolet, "beyond violet," is invisible. The solar radiation coming from the sun can increase the temperature of the earth. The clouds prevent them to reach the surface. Therefore, it is positive feedback.

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It would take approximately 8.09 hours for the drug to degrade to 15% of the initial concentration.

To calculate the time it would take for the drug to degrade to 15% of the initial concentration (0.1M), we can use the first-order degradation equation:

ln([A]/[A]0) = -kt

where [A] is the concentration of the drug at time t, [A]0 is the initial concentration of the drug, k is the rate constant, and t is the time interval.

We can rearrange this equation to solve for t:

t = -(ln([A]/[A]0)) / k

Plugging in the given values, we get:

t = -(ln(0.15/1)) / 0.1 hr^-1 = 8.09 hours

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The decomposition of nitroglycerin is an exothermic reaction. Therefore, the magnitude of ΔH° for the decomposition of 2 moles of nitroglycerin represents the heat released during the decomposition process, in kJ.

In this context, ΔH° refers to the standard enthalpy change of the reaction, and its magnitude represents the heat energy that is released or absorbed during the reaction. A negative magnitude for ΔH° signifies that the reaction is exothermic and releases heat, while a positive magnitude signifies that the reaction is endothermic and absorbs heat.

So, the decomposition of nitroglycerin is an exothermic reaction. Therefore, the magnitude of ΔH° for the decomposition of 2 moles of nitroglycerin represents the heat released during the decomposition process, in kJ.

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The completed table is provided below, based on the mole ratio from the equation of reaction:

The ratio of the mole quantities of any two compounds present in a balanced chemical reaction is known as the mole ratio.

A comparison of the ratios of the molecules required to accomplish the reaction is given by the balancing chemical equation.

In many chemical reactions, mole ratios are used as conversion factors between products and reactants.

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