What is the definition of period?

The density of the metal is 2.7 g/cm3. The object will sink in water because it is heavier than water.

The density of a substance is the ratio of the mass of the substance and its volume.

The density of a substance is mathematically expressed as:

Density = mass/volume. The unit is g/cm3

The volume of the cylindrical metal can be determined in this case from the attributes given.

Height = 2.03 inches = 5.16 cm

Diameter = 17.0 mm = 1.7 cm

radius = 1.7/2 = 0.85 cm

Volume of a cylinder = πr2h

                          = 22/7 x 0.85 x 0.85 x 5.16 = 11.7169 cm3

Mass of the metal = 31.599 g

Density of the metal = mass/volume = 31.599/11.7169 = 2.7 g/cm3

The density of water is 1 g/cm3. This means that the metal is heavier than water and will, therefore sink in it.

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Answer:

when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.

Explanation:

When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.

Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.

It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.

It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.

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Answer:

Ethylene oxide,  also known as C2H4O, is commonly used for sterilizing things, particularly medical equipment. Cold sterilization is a form of sterilization, so, "cold sterilization" is correct.

Let me know if this helps!

Answer: Ethylene oxcide is  used for cold sterilization

Explanation:

Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

Answer:

Mass is the independent variable, and boiling point is the dependent variable.

Answer:

B

Explanation:

neutrons + atomic number/proton/electron for a neutral atom = mass number

e.g

mass number of Chlorine 35.5

proton number 17

neutron number will be 35.5-17 = 18.5

Therefore.....

your question deduced says

atomic number is 5

mass number is 11

neutron number is however mass number minus atomic number 11-5 =6

Answer:

M=0.816M

Explanation:

Hello,

In this case, we should consider the following reaction:

\(AgNO_3+KCl\rightarrow KNO_3+AgCl\)

Thus, by knowing the 1:1 molar ratio of silver nitrate and potassium chloride, we can easily compute the moles of silver nitrate precipitating the 1570 mg of potassium chloride considering its molar mass of 74.5513 g/mol:

\(n_{AgNO_3}=1570mgKCl*\frac{1gKCl}{1000mgKCl} *\frac{1molKCl}{74.5513gKCl}*\frac{1molAgNO_3}{1molKCl} \\\\n_{AgNO_3}=0.021molAgNO_3\)

Then, by using the volume of silver nitrate in liters (0.0258 L), we can directly compute the molarity:

\(M=\frac{0.021molAgNO_3}{0.0258L}\\ \\M=0.816M\)

Regards.

Answer:

Earth has a strong gravitational field while exoplanets do not.

Explanation:

Rate Brainliest please

All of the planets in our solar system orbit around the Sun. Planets that orbit around other stars are called exoplanets.

Answer:

NaO2

Explanation:

Solutions are mixtures that are homogenous and comprise solutes and solvents. Methyl alcohol will react with solid sodium chloride to form a solution. Thus, option D is correct.

The solutions are the mixtures of the solute and the solvent. The solute and the solvent are capable of forming a solution only if they both are either polar or nonpolar.

Here, chlorine is a gas, and sodium superoxide is a solid that cannot react with solid sodium chloride to make a solution and hence is eliminated. As sodium chloride is polar it cannot react with nonpolar carbon tetrachloride.

Methyl alcohol is polar and so is sodium chloride. They will react together as,

CH₃OH + NaCl → CH₃Cl + NaOH

Therefore, option D. CH₃OH will react to form a solution.

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Answer:

hen ,b=4-a. From. Equation (2). Then b= 3. Now,,(a)square+(b)square=1square+3square. =1+9. =10. therefore the value of a square plus bsquare is 10

Explanation:

CO₂ have a higher boiling point than CH₄ when they both possess dispersion forces because CO₂ consists of polar bonds between carbon and oxygen.

Intermolecular forces determine bulk properties, such as the melting points of solids and the boiling points of liquids.

Liquids boil when the molecules have enough thermal energy to overcome the intermolecular attractive forces that hold them together, thereby forming bubbles of vapor within the liquid.

CO₂ have a higher boiling point than CH₄ when they both possess dispersion forces because CO₂ consists of polar bonds between carbon and oxygen. The polarity increases the boiling point of the molecule.

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You would recover 36.525g of NaCl after evaporating all of the water.

To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:

mass = moles * molar mass

Where:

Moles = Molarity * Volume

Molarity = 0.250 M

Volume = 2500.0 mL = 2.5 L

Molar mass of NaCl = 58.44 g/mol

mass = 0.250 M * 2.5 L * 58.44 g/mol

mass = 36.525 g

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Answer:

80 gm/mol

Explanation:

it may be helpful

Answer: a

. dissolving it in water

Explanation:

When the unknown material is dissolved in water, it could react with the water particles and end up producing another material. For instance an alkali metal in water could form metal oxides.

Heating the material until it melts will not change it into another material because it will still be the same material only now it will be in liquid form. The same logic applies if it is burnt in a flame.

Vomiting, headaches, wooziness, blurred vision, and even liver injury are side effects of vitamin A. Vitamin D - Tiredness, headache, sickness, and vomiting. Vitamin C: Heartburn, diarrhea, vomiting, and nausea.

Yes, excessive amounts of some types of vitamin A can be dangerous. A strong headache, blurred vision, nausea, dizziness, muscular aches, and issues with coordination can result from taking too much preformed vitamin A, which is typically found in supplements or some medications.

Poisonous Substance. Any component in a multivitamin supplement can be toxic in large doses, but iron or calcium pose the biggest threat. Large or toxic doses of calcium, vitamin D, and vitamin A carry additional dangers.

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The compound C4H6O4 can be classified as a dicarboxylic acid. In this case, the presence of four carbon atoms (C4) indicates that it is a relatively larger molecule.

The molecular formula also contains six hydrogen atoms (H6) and four oxygen atoms (O4). The presence of oxygen and carbon atoms suggests the possibility of carboxyl groups (-COOH) in the compound. Carboxyl groups are functional groups consisting of a carbonyl group (C=O) and a hydroxyl group (-OH) attached to the same carbon atom.

Since the compound contains four oxygen atoms, it is possible that it contains two carboxyl groups. A compound with two carboxyl groups is classified as a dicarboxylic acid. Dicarboxylic acids are organic compounds that have two carboxyl functional groups.

They are characterized by their ability to donate two protons (H+) and act as acids. Therefore, based on the molecular formula C4H6O4, the compound is classified as a dicarboxylic acid.

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\(\\ \tt\hookrightarrow PV=nRT\)

\(\\ \tt\hookrightarrow V=\dfrac{nRT}{P}\)

\(\\ \tt\hookrightarrow V=\dfrac{2(8.314)(300)}{2}\)

\(\\ \tt\hookrightarrow V=8.314(300)\)

\(\\ \tt\hookrightarrow V=2494.2mL\)

\(\\ \tt\hookrightarrow V=24.94dm^3\)

2 moles of a gas have a pressure of 2 atm at a temperature of 300 K then volume will be 24.94 \(dm^{3}\).

The mole would be a SI unit that is used to quantify the quantity of any material. Mol is just the shorthand for "mole."

The force among all gas particle/wall interactions distributed mostly by the surface area of the wall would be the definition of pressure (P). Another of the fundamental quantifiable variables of this stage of matter, pressure, would be a property shared by all gases.

Calculation of volume.

Given data:

Number of moles = 2 mol

pressure = 2 atm

Temperature = 300K

Volume = ?

Volume can be calculated by using the formula:

PV = nRT

where, P is pressure, T is temperature.

Now, put the value of given data in above equation.

V = nRT / P

V = 2 × 8.31× 300/ 2

V = 2494.2ml

V = 24.94 \(dm^{3}\)

Therefore, the volume will be 24.94 \(dm^{3}\)

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Ketoacidosis is a potentially life-threatening condition that happens when the body begins breaking down fat at very fast rate. The fat is converted by the liver and causes the blood to become acidic and needs to be treated immediately.

Diabetes-related ketoacidosis (DKA) is a potentially fatal condition that affects diabetics. It happens when the body begins breaking down fat at an abnormally fast rate. The fat is converted by the liver into a fuel called ketones, which causes the blood to become acidic.

Diabetic ketoacidosis symptoms frequently appear suddenly, sometimes within 24 hours. High blood sugar levels and high ketone levels in urine are some of the first signs for DKA.

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Taking into account the definition of sensible heat, the energy required to raise the temperature of 4.2 mol of graphite by 25.0°C is 895.3455 J.

Sensible heat is defined as the amount of heat that a body absorbs or releases without changes in its physical state (phase change). In other words, when a system absorbs (or gives up) a certain amount of heat, it can happen that it experiences a change in its temperature without a phase change occurring, which implies sensible heat.

The expression that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the definition of sensible heat:

Q = 0.71 J/gC× 50.442 g× 25 C

Solving:

Q= 895.3455 J

In summary, the energy required is 895.3455 J.

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3.21 grams of Aluminum Sulfate are got when 4 g of Aluminum Nitrate reacts chemcially with 3 g of Sodium Sulfate.

The equation given is not balanced. Thus,  when balanced the equation becomes:

2 Al(NO₃)₃ + 3 Na₂SO₄ → Al₂(SO₄)₃ + 6 NaNO₃

The molar mass of Al(NO₃)₃ is:

Al(NO₃)₃ = 1(Al) + 3(N) + 9(O) = 213 g/mol

The molar mass of Na₂SO₄ is:

Na₂SO₄ = 2(Na) + 1(S) + 4(O) = 142 g/mol

From the balanced equation, we can see that 2 moles of Al(NO₃)₃ react with 3 moles of Na2SO4 to produce 1 mole of Al₂(SO₄)₃. Therefore, we can calculate the number of moles of Al(NO₃)₃ and Na₂SO₄ that react:

Number of moles of Al(NO₃)₃ = 4 g / 213 g/mol = 0.0188 mol

Number of moles of Na₂SO₄ = 3 g / 142 g/mol = 0.0211 mol

From the balanced equation, we can see that 2 moles of Al(NO₃)₃ produce 1 mole of Al₂(SO₄)₃. Therefore, the number of moles of Al₂(SO₄)₃ produced is:

Number of moles of Al₂(SO₄)₃ = 0.0188 mol / 2 * 1 = 0.0094 mol

The molar mass of Aluminum Sulfate (Al₂(SO₄)₃) is:

Al₂(SO₄)₃ = 2(Al) + 3(S) + 12(O) = 342 g/mol

Therefore, the mass of Aluminum Sulfate produced is:

Mass of Al₂(SO₄)₃ = Number of moles of Al₂(SO₄)₃ * Molar mass of Al₂(SO₄)₃

= 0.0094 mol * 342 g/mol

= 3.21 g

Hence, 3.21 grams of Aluminum Sulfate are liberated when 4 g of Aluminum Nitrate change state with 3 g of Sodium Sulfate.

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As the chemical reaction proceeds, a gas is formed with the water molecule and CH₃COONa, so the mass of the remaining solid product is less than 345 g.

Stoichiometry tells about the relative amount of reactants and products before and after the reaction in terms of coefficient.

Given chemical reaction is:

NaHCO₃ + CH₃COOH → CH₃COONa + CO₂ + H₂O

From the stoichiometry of the reaction it is clear that 1 mole of both the reactants will form products. And for the formation of product amounts of the reactants get wholly consumed. From 345 grams of reactants carbon dioxide gas, water and sodium acetate salt is formed, so the mass of this formed salt is less than 345 grams.

Hence, option (C) is correct i.e. less that 345g.

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Answer:

It is important for us to be able to make hydrogen from seawater instead of pure water for several reasons:

   Abundance: Seawater is abundant and widely available, making it a more sustainable and renewable source of hydrogen compared to pure water, which is often in limited supply.

   Cost-effective: Seawater is a low-cost source of hydrogen, as it does not require the use of fresh water, which can be scarce and expensive in many regions.

   Energy efficient: Seawater contains dissolved salts and minerals, which can be used as catalysts to speed up the water splitting process and make it more energy efficient.

   Environmental impact: Using seawater as a source of hydrogen instead of pure water reduces the amount of freshwater that is used, conserving this precious resource and minimizing the environmental impact of water extraction and transportation.

   Versatility: Seawater can be used as feedstock for various hydrogen production methods such as electrolysis, thermolysis, photocatalysis, and biotechnology.

In summary, being able to make hydrogen from seawater is crucial to address the growing energy demand while also preserving fresh water resources, and also to make hydrogen production more sustainable and cost-effective.

Explanation:

hope this helps

The reaction is balanced because the number of atoms of each element or particle is equal on both sides of the equation.

Nuclear reaction is the process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.

The reaction products in a nuclear reaction may contain a different element or a different isotope of the same element.

According to this question, the following fission reaction of uranium is given below:

238/92 → 234/90Th + 4/2α

Based on the above reaction, the sum of the atomic mass and atomic number of the products is 238 and 92 respectively. This means that the equation is balanced.

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In order to test for ammonia, a moist red litmus paper should be held over the test tube containing the ammonia.  Option 3.

Ammonia is a substance that is alkaline in nature. All alkaline substances are able to turn red litmus paper to blue. This is in opposition to acidic substances that turn blue litmus paper to red.

Thus, the first test that can be used to determine if a substance is ammonia would be to hold a moist red litmus paper over the test tube containing the suspected substance.

Since ammonia is gas at room temperature, the substance suspected to be ammonia will diffuse from the test tube to turn the moist red litmus paper to blue.

Other methods to test for ammonia include passing a test tube containing hydrochloric acid over the test tube containing the substance. A white fume of ammonium chloride will confirm the presence of ammonia.

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Answer:

(A) getting study help, and retaking classes or exams

(A) applying for a loan

(C) getting study help, and retaking the exam

Explanation:

A hypothesis is a proposed explanation or prediction based on limited evidence or observations, which can be tested through further investigation or experimentation. It should be specific, testable, and based on existing knowledge.

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Atmospheric oxygen is too reactive which keeps natural atoms from framing all alone and staying in one piece today. The main speculation about the reason for the Cambrian explosion includes a mass elimination of Ediacaran fauna and an expansion in climatic oxygen.

During the Cambrian explosion, creatures not just began to eat meat, like floating tiny fish, yet they additionally created jaws for getting and biting greater prey. The resulting weapons contest prompted hard body parts and shells for insurance, for example, the intricate spikes and towers of trilobite shells. The Cambrian Period frame denotes a significant point throughout the entire existence of life on the planet, it is when a large portion of the significant gatherings of creatures initially show up in the fossil record. This occasion is in some cases called the "Cambrian Explosion," as a result of the generally brief time frame over which this variety of structures shows up.

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