Based on the periodic table, which of the following groups of elements should have very similar chemical properties?
OA. potassium (K), aluminum (Al), neon (Ne)
OB. carbon (C), iodine (1), hydrogen (H)
OC. lithium (Li), sodium (Na), potassium (K)
OD. manganese (Mn), magnesium (Mg), molybdenum (Mo)

Answer:

In chemistry, the mole is a unit used to talk about atoms. It is similar to other units we use everyday. For example, you might walk into the local doughnut shop and order a dozen doughnuts. In doing so, you know that you will get 12 of these snacks and the clerk knows to give you 12.

Answer:

469 gallons

Explanation:

From the question given, we were told that:

For every 32 miles, 1 gallon of gasoline is consumed.

With the above information, we can obtain the number of gallon of gasoline consumed by a car per year i.e 15000 miles

This is illustrated below:

If 32 miles consumed 1 gallon of gasoline,

Therefore, 15000 miles will consume = 15000/32 ≈ 469 gallons of gasoline.

Therefore, 469 gallons of gasoline is consumed by the average car each year

The

The balancing of the equations are as follows:

1. 2 Na + N₂ -> 2 NaN

2. H₃PO₄ + 3 KOH -> K₃PO₄ + 3 H₂O

3. N₂ + 3 H₂ -> 2 NH₃

4. Fe + HCl -> FeCl2₂ + H₂

5. Zn + 2 HCl -> ZnCl₂ + H₂

6. CH₄ + 2 O₂ -> CO₂ + 2 H₂O

7. H₂S + CuSO₄ -> CuS + H₂SO₄

8. 2 NH₄ + + 2 NO₃ - -> N₂ + 4 H₂O

Chemical balancing, also known as chemical equation balancing, is the process of adjusting the coefficients in a chemical equation to ensure that the same number of each type of atom is present on both the reactant and product sides of the equation. In other words, chemical balancing ensures that the law of conservation of mass is satisfied for the given chemical reaction

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The molecule described, consisting of a hydrogen atom bonded to an oxygen atom and carrying a negative charge, is called a hydroxide ion.

A hydroxide ion (OH-) is a negatively charged molecule formed when a hydrogen atom (H) is bonded to an oxygen atom (O). It carries a negative charge due to the extra electron it possesses.

The hydroxide ion is commonly found in chemical reactions and solutions, particularly in the context of acids and bases. It is an important species in chemistry and plays a role in various chemical processes, such as acid-base reactions and the formation of salts.

Its negative charge gives it distinct chemical properties and reactivity.

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Radioactive contamination refers to the presence of radioactive material in a location where it may pose a potential risk or harm to individuals or the environment. The correct answer is C) radioactive contamination.

It occurs when radioactive substances are released or deposited in an area, leading to the contamination of surfaces, objects, or organisms with radioactive particles or radiation. This contamination can occur as a result of accidents, spills, leaks, or improper handling of radioactive materials. Radioactive contamination can have serious health consequences as exposure to radioactive substances can lead to radiation sickness, genetic damage, or an increased risk of developing cancer. It is crucial to properly manage and mitigate radioactive contamination to ensure the safety of individuals and the environment. This involves employing protective measures such as containment, decontamination procedures, and implementing strict protocols for handling and disposing of radioactive materials.

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Answer:

A

B

A

Explanation:

all emit light except form green grass and blue carpet

The carbonyl stretch frequency for mesityl oxide is one that is said to be expected to take place in the range of 1670-1750 cm^-1 in the infrared (IR) spectrum.

Mesityl oxide is an organic substance that has the molecular formula C6H10O and consists of a carbonyl functional group situated within the molecule. Upon exposure to infrared radiation, mesityl oxide takes in certain light frequencies that correspond to the movements of its atomic and chemical bond constituents.

The stretching of the C=O bond in the carbonyl functional group within mesityl oxide is likely to produce a significant absorption band in the IR spectrum.

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A is the best choice. Since alcoholism requires lifetime treatment, it is regarded as a chronic condition. Due to its extreme difficulty in treatment, alcoholism is regarded as a chronic condition.

And tends to come back over the course of the affected person's lifespan. An alcoholic is never fully freed from their addiction, even though it can be treated. They must take action and keep in mind that their illness may flare up at any time. Navigate to content To search, click. A chronic condition is a sickness that develops over time or a human health condition that is persistent or has other long-lasting impacts. Alcoholism is generally defined as any drinking of alcohol that causes serious issues with one's mental or physical health.

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Jar containing sulfur-30 will have least amount of sulfur.

Radioactivity of a substance decreases with increase in time indicating that they are inversely proportional.Among the different isotopes of sulfur mentioned ,sulfur-35 is most radioactive as it has half-life period of 87.5 days.

On the other hand, sulfur-30  is least radioactive as it has half-life period of 1.18 seconds, thus within 10 seconds the jar containing sulfur-30 will be  almost empty.

Therefore,the jar containing sulfur-30 will have least amount of sulfur after 10 seconds as it's half-life is least.

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Solutions of sodium chloride conduct electricity because the solution contains free sodium and chloride ions.

Solutions containing electrolytes conduct electricity because the electrolytes produce ions in solution. Solutions

containing electrolytes do not always conduct electricity.

These are all true statements. The last statement "Only strong electrolytes conduct electricity" is false because even weak electrolytes can conduct electricity to some extent.
1. Solutions of sodium chloride conduct electricity because the solution contains free sodium and chloride ions.
2. Solutions containing electrolytes conduct electricity because the electrolytes produce ions in solution.

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Answer:

56.2 g

Explanation:

To indicate the quotient of two integers, use fractions.

11/15 of the potato was used.

From the question, we have the following parameters:

1 bag = 15 sweet potatoes

Casserole = 2/5

Pie = 1/3

The fraction of potato used is calculated using:

Fraction =  Casserole + Pie

Take LCM

11/15

Hence, the fraction of potato used is 11/15

There are three different kinds of integers: 0 (zero), positive integers (natural numbers), and negative integers (Additive inverse of Natural Numbers)

The collection of whole numbers and their antipodes is known as the integers. The set of integers does not include fractions or decimals. Integers include, for instance, 2,5,0,12,244,15, and 8.

The number zero (0), a positive natural number (1, 2, 3, etc.), or a negative integer denoted by a minus sign (1, 2, 3, etc.) are all examples of integers.

The inverse additives of the equivalent positive numbers are the negative numbers.

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The type of fingerprint found at the crime scene in this scenario is referred to as plastic.

This is the of fingerprint which is three dimensional and can be easily seen with the human eye.

Plastic fingerprint can be made by pressing the finger on substances such as wax, paint etc.

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Answer:

the answer would be molded I believe.

choices are Latent,patent, inadmissible molded,trace.

Latent heat under normal conditions is when a substance is changing state, and the loss or gain of energy is when the temperature of an object is decreasing or increasing.

When heat is exchanged among a hot and cold object, the temperature of the cold object goes on increasing because of gaining the energy and the temperature of the hot object goes on decreasing because of losing the energy.

This change in temperature will continue until the temperature of both the objects reach the same value. During this process, the cold object gains heat energy and the hot object loses heat energy.

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Answer:

1.VOLUME– The amount of space an object takes up. Basic Unit (SI Unit) for Solids – Cubic Meter, m3. LENGTH/DISTANCE – The measurement between two points.

2.one particle per cubic meter.

3.it means it is heavier

4.In a liquid the particles are still close together but a little further apart than in a solid.

5.In gases the particles are much further apart than in solids or liquids.

Explanation:

thats all i can type lol

Approximately 91.6 grams of potassium chloride can be dissolved in 200g of water at 80°C.

At 80°C, the solubility of potassium chloride in water is approximately 45.8 grams per 100 grams of water. Therefore, to find out how many grams of potassium chloride can be dissolved in 200g of water at 80°C, we need to use a proportion.

45.8 grams of potassium chloride / 100 grams of water = X grams of potassium chloride / 200 grams of water

Solving for X, we get:

X = (45.8 grams / 100 grams) * 200 grams = 91.6 grams

Therefore, at 80°C, approximately 91.6 grams of potassium chloride can be dissolved in 200g of water.

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Answer

84.8485 g

Explanation

Initial temperature, T₁ = 148 °C

Final temperature, T₂ = 20.4 °C

ΔT = T₂ - T₁

ΔT = 20.4 - 148

ΔT = -127.6 °C

Since heat is released, i.e heat loss, then Q = -324.8 calories

specific heat of the lead bar, c = 0.0300 cal/g°C

Using Q = mcΔT, we can find m as shown below

The mass of the bar is 84.8485 g

The molar mass of citric acid (c6h8o7) is 192.124g/mol

The molar mass of baking soda (nahco3) is 84.007g/mol

The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample and is measured in moles. Molar mass is a mass property, not a molecular property of a substance.

Molar mass is the mass of 1 mole of the sample. To find the molar mass, add up the atomic masses (atomic weights) of all the atoms in the molecule. Use the masses listed in the periodic table or atomic weight table to determine the atomic mass of each element.

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The molar mass of citric acid (C6H8O7) : 192.12 g/mol

The molar mass of citric acid (C6H8O7) : 84.007 g/mol

Baking soda is a monosodium salt of carbonic acid with alkalizing and electrolyte substitution properties. When dissociated, baking soda forms sodium and bicarbonate ions. Ion formation increases plasma bicarbonate and buffers excess hydrogen ion concentration, resulting in an increase in blood pH.

Citric acid is a naturally occurring weak acid in all citrus fruits. If you've ever sunk your teeth in a lemon, you've tasted citric acid. Manufacturers add artificial versions of it to processed foods. Drugs containing citric acid treat health problems such as kidney stones.

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Answer:

Column A            \({}\)                                              Column B

1. CaS                   \({}\)                                              Calcium Sulfide

2. CaSO₄            \({}\)                                                Calcium sulfate

3. CaSO₃            \({}\)                                                 Calcium sulfite

Explanation:

1) Calcium sulfide is a compound formed between calcium, Ca, and sulfur, S, with a chemical formula of CaS. It forms cubic crystals similar to rock salt, and smells like rotten eggs

2) Calcium sulfate is a chemical compound consisting of calcium, Ca, and sulfate SO₄. It is found in nature in the hydrated form as the mineral gypsum

3)Calcium sulfite is a chemical compound formed between calcium, Ca and sulfite, SO₃ used to treat water and preserve food.

Answer:

the formula for calcium sulfite is CaSO3

the formula for calcium sulfate is CaSO4

the formula for calcium sulfide is CaS

Explanation:

Answer: A

Explanation: A

The mixtures would result in the pk, of the acid being obtained from a direct pH measurement of the resulting solution is  25 cm³ 0.1 mol dm⁻³HCl and 25 cm³ 0.1 mol dm⁻³ NaCl. Therefore, option A is correct.

The pH scale, which previously stood for "potential of hydrogen," is used to describe how acidic or basic an aqueous solution is. The pH values of acidic solutions are lower than those of basic or alkaline solutions.

The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.

A solution's pH is a significant indicator of its chemical composition. The pH can affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.

Thus, option A is correct.

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The molarity of the phosphorous acid solution is approximately 0.00760 M.To determine the molarity of the phosphorous acid solution, we need to use the balanced chemical equation and the stoichiometry of the reaction between ammonia and phosphorous acid.

The balanced chemical equation for the reaction between ammonia (NH3) and phosphorous acid (H3PO3) is:

3NH3 + H3PO3 -> (NH4)3PO3

From the equation, we can see that the ratio of ammonia to phosphorous acid is 3:1.

Given that 11.91 ml of 0.162 M ammonia solution reacts, we can calculate the number of moles of ammonia used:

Moles of ammonia = volume (in L) x molarity

Moles of ammonia = 0.01191 L x 0.162 mol/L = 0.001930 mol

Since the ratio of ammonia to phosphorous acid is 3:1, we know that the number of moles of phosphorous acid used is one-third of the moles of ammonia:

Moles of phosphorous acid = 1/3 x moles of ammonia

Moles of phosphorous acid = 1/3 x 0.001930 mol = 0.000643 mol

Next, we calculate the molarity of the phosphorous acid solution:

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

Molarity = 0.000643 mol / 0.08459 L = 0.00760 M

Therefore, the molarity of the phosphorous acid solution is approximately 0.00760 M.

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Answer:

The correct answer is 66.1 g

Explanation:

According to Law of Conservation of the Mass, the mass of an isolated system is neither created or destroyed during chemical reactions. It is transformed. So, in a chemical reaction, the atoms of reactants are reoganizated by forming other compounds but the mass is conserved. Thus, the total mass of reactants is always equal to the total mass of products. If 23.6 g of a substance reacts with 42.5 g of another substance, the total mass of the products will be equal to the total mass of reactants:

23.6 g + 42.5 g = 66.1 g reactants = 66.1 g products

Answer:

1.2×1023 molecules.

hope it helps

1) Hurricane

2) winds blowing from high pressure to low pressure

3) Clock wise rotation

The pH of the solution with [H₃O+] = 1.8 x 10⁻⁵ M is 4.74, therefore this substance is acid.

pH is a measure of the acidity or basicity of a solution and is defined as the negative logarithm (base 10) of the concentration of hydrogen ions (H+) in a solution.

A substance is considered acidic if it has a pH value less than 7, which means it has a higher concentration of H+ ions than OH- ions. On the other hand, a substance is considered basic if it has a pH value greater than 7, which means it has a higher concentration of OH- ions than H+ ions. If a substance has a pH value of 7, it is considered neutral, indicating that the concentration of H+ ions and OH- ions are equal.

The pH of the solution with [H₃O+] = 1.8 x 10⁻⁵ M is calculated by taking the negative log of the concentration of H₃O+. Thus:

pH = -log(1.8 x 10⁻⁵) = 4.74. This pH value indicates that the solution is slightly acidic.

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a. NH3 (Ammonia): In a 1.0L container of NH3 at Standard Temperature and Pressure (STP), intermolecular forces such as hydrogen bonding would be exerted.

b) 1.0L container of CHCl3 at STP, dipole-dipole interactions (along with London dispersion forces) would be present.

a. NH3 (Ammonia):

In a 1.0L container of NH3 at Standard Temperature and Pressure (STP), intermolecular forces such as hydrogen bonding would be exerted. Ammonia (NH3) molecules consist of one nitrogen atom bonded to three hydrogen atoms, forming a trigonal pyramidal shape.

Hydrogen bonding is a type of intermolecular force that occurs when a hydrogen atom is covalently bonded to an electronegative atom (in this case, nitrogen) and interacts with another electronegative atom (in this case, the nitrogen atom of a neighboring NH3 molecule).

b. CHCl3 (Chloroform):

In a 1.0L container of CHCl3 (chloroform) at STP, intermolecular forces such as dipole-dipole interactions would be exerted. Chloroform (CHCl3) molecules consist of one carbon atom bonded to three hydrogen atoms and one chlorine atom, forming a tetrahedral shape.

Dipole-dipole interactions arise due to the difference in electronegativity between chlorine and hydrogen atoms. The chlorine atom is more electronegative than hydrogen, resulting in a polar covalent bond.

While dipole-dipole interactions are present in CHCl3, it is worth noting that CHCl3 also exhibits London dispersion forces. These forces occur due to temporary fluctuations in electron distribution, creating temporary dipoles.

London dispersion forces are the weakest type of intermolecular force but still contribute to the overall intermolecular interactions in CHCl3.

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Answer:

That means its a Transition Metal!

Explanation:

Answer:

SO₃(g) + H₂O(l) → H₂SO₄(aq)

Explanation:

The molecular formula for the involved species are:

With the above information in mind we can proceed to write the reaction equation: