is it true or false?

Answer:

group 2

Explanation:

all this are found in group 2

Answer:Hope this helps!

Explanation:

You can use a flame test to help identify the composition of a sample. The test is used to identify metal ions (and certain other ions) based on the characteristic emission spectrum of the elements. The test is performed by dipping a wire or wooden splint into a sample solution or coating it with the powdered metal salt. The color of a gas flame is observed as the sample is heated. If a wooden splint is used, it's necessary to wave the sample through the flame to avoid setting the wood on fire. The color of the flame is compared against the flame colors known to be associated with the metals.

Therefore, the bottom hole pressure is 500 psi when the well productivity is 2.5. Since the height is negative, it indicates that the liquid is below the perforation depth of 8,000 ft. Therefore, the liquid level will not rise in the tubing, and the tubing will remain empty.  Therefore, gas lift operation is justified in this scenario.

a) To determine the bottom hole pressure (BHP) when the well productivity is 2.5, we can use the Vogel's equation:

BHP = Shut-in BHP - (Productivity Index × Liquid Flow Rate)

Given:

Shut-in BHP = 2,500 psi

Productivity Index = 2.5

Liquid Flow Rate = 800 b bl/d

Convert the liquid flow rate to barrels per day:

Liquid Flow Rate = 800 b bl/d

Substitute the values into the equation:

BHP = 2,500 - (2.5 × 800)

BHP = 2,500 - 2,000

BHP = 500 psi

Therefore, the bottom hole pressure is 500 psi when the well productivity is 2.5.

b) The level to which the liquid is allowed to rise in the tubing can be determined using the bubble point pressure of the liquid, which is the pressure at which gas begins to come out of solution. The bubble point pressure can be estimated using the specific gravity of the formation water and the API gravity of the oil.

In this case, the specific gravity of the formation water is given as 1.2, and the API gravity of the oil is 35°API. Using correlations or tables, we can estimate the bubble point pressure.

Assuming that the bubble point pressure is 1,000 psi, we can calculate the height of the liquid column using the hydrostatic pressure equation:

Height = (BHP - Bubble Point Pressure) / (0.433 × Specific Gravity of Liquid)

Given:

BHP = 500 psi

Bubble Point Pressure = 1,000 psi

Specific Gravity of Liquid = (141.5 / (API Gravity of Oil)) - 131.5

Specific Gravity of Liquid = (141.5 / 35) - 131.5 ≈ 0.23

Substitute the values into the equation:

Height = (500 - 1,000) / (0.433 × 0.23)

Height ≈ -3,269 ft

Since the height is negative, it indicates that the liquid is below the perforation depth of 8,000 ft. Therefore, the liquid level will not rise in the tubing, and the tubing will remain empty.

c) Gas lift operation should be executed when there is a need to lift the produced fluid from the wellbore to the surface. In this case, the well is equipped with a gas lift system, which suggests that gas lift operation is intended. Gas lift can help to overcome the wellbore pressure and lift the liquid to the surface. Given the desired liquid flow rate and the presence of water-cut in the produced fluid, gas lift can aid in lifting the fluid mixture to the surface efficiently. Therefore, gas lift operation is justified in this scenario.

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The half-life of this substance is 30.13 minutes.

Half-life is the duration of time it takes for a radioactive element to decay to half of its initial value. This suggests that a source's activity has a half-life when it takes time for it to decrease to half its initial value.

Expression for rate law for first order kinetics is given by:

K = 2.303/t log a/a-x

where,

k = rate constant  = ?

t = time passed by the sample  = 60.1 min

a = initial amount of the reactant = 400

a - x = amount left after decay process = 100

Therefore, K= 2.303/60.1 log 400/100

k= 2.3 x 10^ -2 min-1

Now we have to calculate the half-life of substance, we use the formula :

k = 0.693 / t

t = 30.13 min

Therefore, the half-life of this substance will be, 30.13 minutes.

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There are 1.505 x 10²⁴ atoms of krypton in 2.50 mol of Kr gas.

To determine the number of atoms of krypton in 2.50 mol of Kr gas, we can use Avogadro's number, which states that 1 mole of any substance contains 6.022 x 10²³ particles (atoms, molecules, or ions).

Given that we have 2.50 mol of Kr gas, we can multiply this value by Avogadro's number to find the number of atoms:

Here is a step-by-step explanation of how to calculate the number of atoms of krypton in 2.50 mol of Kr gas using Avogadro's number:

Step 1: Recall the value of Avogadro's number, which is approximately 6.022 x 10²³ atoms/mol.

Step 2: Multiply the number of moles of Kr gas by Avogadro's number to find the number of atoms.

2.50 mol x (6.022 x 10²³ atoms/mol)

= 15.05 x 10²³ atoms (performing the multiplication)

Step 3: Express the result in standard form.

= 1.505 x 10²⁴ atoms (adjusting the decimal point)

Therefore, there are 1.505 x 10²⁴ atoms of krypton in 2.50 mol of Kr gas.

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If the density of the water is 1.00 g/cm³, the mass of the water in the pounds is 311733.7 pounds.

The backyard swimming pool can holds the water = 185 yd³

The conversion of the yd³ in to the m³ :

185 yd³ = 185 × ( 0.9144)³ m³

185 yd³ = 141.44 m³

The conversion of the m³ in to the kg :

The 1 m³ = 1000 kg

Which means that :

141.4 m³ = 141.44 × 1000 kg

141.4 m³ = 141440 kg

The conversion of the kg in to the pounds :

1 kilogram = 2.204 pounds

141440 kg = 141440 kg × 2.204 pounds

141440 kg = 311733.7 pounds

The mass of the water in the pounds is 311733.7 pounds.

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Answer:

radioactive

Explanation:

becasue i said so. Periodt

Answer:

An unstable isotope emits some kind of radiation, that is it is radioactive.

Explanation:

Answer:

Metals tend to have a low attraction for electrons.

Answer:

The gram formula mass is the sum of the gram atomic masses of the atoms that make up a chemical formula. For lithium fluoride this works out to be 7g + 19g = 26g. Hence the mass of 1 mole of LiF is 26g; and the mass of 1.5 moles of LiF must be 1.5 × 26g = 39g.

Answer:

All of them

Explanation:

All of those are properties of metals

Answer:

A, B, C and D

Explanation:

All of them are properties of metals

Acidosis occurs when there is a high concentration of acids in the blood. Sodium (Na+) is a base, so a high concentration would not cause acidosis.

Carbon dioxide (CO2) is a gas, and is not typically associated with acidosis. Alanine, ketone bodies, and lactic acid are all acidic molecules, so a high concentration of any of these substances could cause acidosis.

Alanine is an amino acid and is normally produced during the breakdown of proteins. Ketone bodies are produced when the body breaks down fat for energy, and lactic acid is produced when the body breaks down carbohydrates.

When the body is unable to process these substances, their concentrations can rise and cause acidosis.

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The Lewis structure of CH3CH2OH with all hydrogen atoms and non-bonding electrons included is shown below. The structure includes more than 100 atoms.

A lewis structure is a diagram that shows the bonding between atoms of a molecule and lone pairs of electrons that may exist in the molecule. It is very important to be able to create a Lewis structure since it provides information regarding the electron pair geometry and bond angles.

The Lewis dot structure for CH3CH2OH is given below: [Figure]The dots represent valence electrons (electrons in the outermost energy level). Each carbon atom has four valence electrons, and each oxygen atom has six. Hydrogen has only one electron. To draw the structure, you start by arranging the atoms and then filling in the valence electrons of each atom.The carbon atoms in ethanol are joined by a single bond.

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The most common acid added to food is citric acid. It is found naturally in citrus fruits such as lemons, limes, and oranges, and is used in many processed foods and beverages to enhance their flavor and provide a sour taste.

Citric acid is also commonly used as a preservative and to balance the pH of certain foods. While malic acid, tartaric acid, and propionic acid are also used in food production, citric acid is the most widely used due to its availability, versatility, and safety.
The most common acid added to food is citric acid (a). Citric acid is a weak organic acid that is naturally present in citrus fruits, such as oranges and lemons. It is often used as a flavor enhancer, and preservative, and to add a tangy taste to various food products. Some common applications of citric acid include soft drinks, fruit juices, candies, and various processed foods. Its popularity as an additive is due to its effectiveness, affordability, and its ability to blend well with other flavors.

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Answer:

4 valence electrons.

Explanation:

Carbon has 4 valence electrons because it is in the 14th group on the Periodic Table.

The movement of carbon across oceans has the greatest potential to affect earth's climate

Carbon reservoirs are the parts of the Earth that store carbon, such as the ocean. Other examples of carbon reservoirs are the soil, land vegetation and the atmosphere. More so, fossil fuels are large reservoirs.

Carbon moves through nature in a balanced way. It moves from one reservoir to another in a carbon cycle. More so, the amount of carbon naturally released tends to be the same as the amount naturally absorbed. This so-called carbon balance allows life to thrive on the planet.

The ocean is there­fore the greatest of the carbon reservoirs, and essentially determines the atmospheric CO₂ content. The carbon, however, requires centuries to penetrate into the deep ocean, because the mixing of the oceans is a rather slow.

Therefore, the movement of carbon across oceans has the greatest potential to affect earth's climate

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First, we define density as:

Density = mass/volume;

We focus first on the volume of air in the room.

Volume:

We have the measurements of where the air is.

We calculate the volume with these measurements, but first, we change the units to L:

1 inch = 2.54 cm

1 L = 10^3 cm^3

1 ft = 12 inch

Now,

11.0 ft x (12 in/1 ft) x (2.54 cm/1 in) = 335.28 cm

12.0 ft = 365.76 cm

10.0 ft = 304.8 cm

Therefore, the volume of the room = 335.28 cm x 365.76 cm x 304.8 cm

Volume = 37378237.5 cm^3 x (1 L/10^3cm^3) = 374 x 10^2 L

From the Density equation, we clear the mass:

Density x volume = mass (g)

1.19 g/L x 374x10^2 L = 445x10^2 g x (1 kg/1000 g) = 44.5 kg

Answer: 44.5 kg

Answer:

The temperature of soup will decrease.

The soup will get as cold as the room temperature.

The temperature of soup will decrease. The soup will get as cold as the room temperature.

Room temperature is a range of air temperatures that most people prefer for indoor settings.

Room temperature is defined differently in different places. It generally refers to a range somewhere between 68 and 74 degrees Fahrenheit.

The temperature of soup will decrease. The soup will get as cold as the room temperature.

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Given that the mole fraction of O2 in the air is 0.21, the total pressure is 0.83 atm, and Henry's law constant (kH) for O2 in water is 1.3 x 10-3 M/atm, the solubility of O2 in water can be calculated to be 2.7 x 10⁻⁴ M.

According to Henry's law, the solubility of a gas (in this case, O2) in a liquid (water) is given by the equation: C = kH * P, Where: C is the concentration of the gas in the liquid (solubility),kH is Henry's law constant for the specific gas, P is the partial pressure of the gas. Given that the mole fraction of O2 in the air is 0.21, we can calculate the partial pressure of O2 in the air as follows: PO2 = XO2 * PT, Where: PO2 is the partial pressure of O2, XO2 is the mole fraction of O2 in air, PT is the total pressure. Substituting the given values, we have PO2 = 0.21 * 0.83 atm = 0.17343 atm. Now, we can calculate the solubility of O2 in water using Henry's law: C = kH * P = (1.3 x 10-3 M/atm) * (0.17343 atm) ≈ 2.7 x 10⁻⁴ M.

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A popular science project and craft used to better understand how particular atoms function is the creation of 3D atom models. When teaching about atoms, a 3D atom model can be used to demonstrate concepts in a classroom or to provide explanations.

The 3D concept of the atom and how the protons and neutrons in the nucleus relate geometrically and in terms of size to the electrons spaced at relatively great distances from the nucleus can be introduced to students from elementary school through high school through an atom model project.

It should be noted that in order to make the 3D concept for the model, attach eight small craft balls to the medium circle, eight to the large circle, eight to the extra-large circle, and finally two to the small circle with glue. These will resemble each and every atom's electron. To help the model hang, attach a piece of string to the outer circle.

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The statistic that provides a better indication of the overall location (centre) of the distribution of CO2 emissions in 2020 is the total CO2 emissions by country.

To determine the overall location or center of the distribution of CO2 emissions, it is crucial to consider the total CO2 emissions by country rather than just the number of countries or their consumption of fossil fuels. The main reason for this is that most of the world's CO2 emissions come from a relatively small number of countries that have high levels of industrial activity and large populations.

When we examine the total CO2 emissions by country, we can identify the countries that contribute the most to global emissions. These countries typically have extensive industrial sectors, rely heavily on fossil fuels for energy production, and have large populations. By focusing on the total emissions, we can gain a more accurate understanding of the distribution of CO2 emissions worldwide.

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C. The theoretical yield of aspirin is found to be 4.2g

The largest amount of product that could be generated from the provided reactant amounts is termed as the theoretical yield. The quantity of product that actually formed during the reaction in a laboratory environment is known as the actual yield.

C₇H₆O₃ + C₄H₆O₃→ C₉H₈O₄ ( aspirin)

No of moles of  salicylic acid => 3.2/138.122 => 0.023 mol

no of moles of acetic anhydride => 1.08 g/mL x 6.3 mL / 102.089 g/mol

                                                        => 0.066mol

salicylic acid is limiting reagent

Theoretical yield calculated:

1 mole of salicylic acid=> 1 mole of aspirin

      Hence,  0.023  mol of aspirin formed in this reaction.

Theorectical yield of aspirin =>  0.023 mol x 180g/mol => 4.2g

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The mass of gum you need to chew to chew one mole of sugar is approximately 5.68 × 10-22 grams.

To calculate the mass of gum that you need to chew to chew one mole of sugar, you need to use the following steps:

Step 1: Find the molar mass of the sugar

The molar mass of sugar is 342.3 g/mol.

Step 2: Convert molar mass to gramsTo convert the molar mass to grams, you need to divide it by Avogadro's number (6.022 × 1023), which gives you 5.68 × 10-22 grams of sugar.

Step 3: Find the mass of gum needed since it is not provided how much sugar is present in a single piece of gum, we can assume that it is negligible.

Therefore, the mass of gum needed to chew one mole of sugar is approximately 5.68 × 10-22 grams.

Hence, the mass of gum you need to chew to chew one mole of sugar is approximately 5.68 × 10-22 grams.

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Answer:

A. Potential energy is stored energy

Explanation:

Answer:

A

Explanation:

i have the same question

Answer: EXAMPLEEE

Explanation: Brookite

Mohs scale hardness 51⁄2 to 6

Luster Submetallic

Streak White, greyish or yellowish

Diaphaneity Opaque to translucent

As Nicole walks to her dorm room after a study group in the library she sees a backpack being stolen. The neurotransmitter activated during this emergency situation is a. norepinephrine.

High levels of norepinephrine can also lead to headaches, high blood sugar, and sleep disturbances. Too much norepinephrine also causes anxiety, high blood pressure and heart rate, and organ stress. Drug withdrawal, chronic renal disease, and mental illnesses like PTSD can also result in high norepinephrine levels. Neurons discharge neurotransmitter, which are chemical messengers, into the synapse through synaptic vesicles. Some neurotransmitter work by increasing the neuron's negative electrical charge, which makes it less likely to activate. This is a deterrent effect. Serotonin is an example of this.

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Answer: The reactants are baking soda and vinegar. Baking soda is a white powder, and vinegar is a clear liquid. The products of this reaction are carbon dioxide, water, and sodium acetate. Carbon dioxide is a colorless gas, water is a colorless liquid, and sodium acetate is a white crystalline powder.

A chemical change can be seen in how the molecular formulas of the products are different from the reactants, since the reactants have chemically changed into completely different molecules.

Hope this helps

The reaction that occurs at the cathode of the illustrated galvanic cell is Zn(s) -> Zn2+ (aq) + 2e-. Option C

The reaction that occurs at the cathode of a typical galvanic cell depends on the relative reduction potentials of the two half-reactions involved.

In this case, the reduction potential for the reduction of Al3+ (-1.68 V) is more negative than the reduction potential for the reduction of Zn2+ (-0.76 V). This means that the reduction of Al3+ requires more energy than the reduction of Zn2+.

Since the cathode is the site of reduction, the half-reaction with the more positive reduction potential (i.e., the reduction of Zn2+) will occur at the cathode.

Therefore, the correct answer is Zn(s) -> Zn2+ (aq) + 2e-.

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The ionic equation for dissolution and the solubility product (ksp) expression for each of the following slightly soluble ionic compounds.

(a) For PbCl2:
Dissolution: PbCl2 (s) → Pb²⁺ (aq) + 2Cl⁻ (aq)
Ionic equation: PbCl2 (s) ⇌ Pb²⁺ (aq) + 2Cl⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Pb²⁺][Cl⁻]²

(b) For Ag2S:
Dissolution: Ag2S (s) → 2Ag⁺ (aq) + S²⁻ (aq)
Ionic equation: Ag2S (s) ⇌ 2Ag⁺ (aq) + S²⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Ag⁺]²[S²⁻]

(c) For Sr3(PO4)2:
Dissolution: Sr3(PO4)2 (s) → 3Sr²⁺ (aq) + 2PO₄³⁻ (aq)
Ionic equation: Sr3(PO4)2 (s) ⇌ 3Sr²⁺ (aq) + 2PO₄³⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Sr²⁺]³[PO₄³⁻]²

(d) For SrSO4:
Dissolution: SrSO4 (s) → Sr²⁺ (aq) + SO₄²⁻ (aq)
Ionic equation: SrSO4 (s) ⇌ Sr²⁺ (aq) + SO₄²⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Sr²⁺][SO₄²⁻]

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Answer:

Explanation:

Grass. Producer

Goldfish. Pri. Consumer and Herbivores

Deer. Pri. Consumer and Herbivores

Horse. Pri. Consumer and Herbivores

Snake. Sec. Consumer and Carnivores

Lion. Tert. Consumer and

carnivores

People Pri. Sec. and tert. Consumers

Bacteria. Decomposers