Complete the flowchart about the scientific method.

Answer:

N=9.933×10^23

Explanation:

\(n = \frac{m}{mr} \)

N=n×la

Answer:

Urea contains more nitrogen

Explanation:

1 mole of Urea contains 2 moles of Nitrogen and 1 mole of ammonium sulfate contains, also, 2 moles of nitrogen.

60g of urea (Molar mass: 60g/mol) contains:

60g × (1mol / 60g) = 1 mole. As 1 mole of urea contains 2 moles of nitrogen, moles of nitrogen are 2.

100g of ammonium sulfate (Molar mass: 132g/mol) contains:

100g × (1mol / 132g) = 0.758 moles.

As 1 mole of urea contains 2 moles of nitrogen, moles of nitrogen are 0.758×2 = 1.516 moles.

That means, urea contains more nitrogen.

Answer: Protons and Electrons

Explanation:

Atoms are made up of 3 subatomic particles.

Protons (Positive Charge)

Electrons (Negative Charge)

Neutrons (Neutral Charge)

The number of protons must be equal to that of electrons in order for the overall charge to be neutral.

A thermometer measures change in the temperature of a substance and therefore, the change in kinetic energy of the molecules.

A thermometer is an instrument used to measure the temperature of a substance or an object.

Temperature is a measure of the degree of hotness or coldness of a substance or object.

The temperature of an object depends on the heat energy added or removed from the object.

When heat energy is added to a substance, the kinetic energy of the molecules of the substance increases and the temperature increases.

Therefore, a thermometer when the thermometer reading shows an increase in temperature, the kinetic energy of the molecules increases as well and vice versa.

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Explanation:

Y has 13 protons and we know that Aluminium (Al) too has 13 protons.

So , element Y = Aluminium

• In an element , no. of protons = no. of electrons. So , Y has 13 electrons.

• Mass no. of Y (Aluminium) = 27.

• Also we know that ,

Mass number = no. of protons + no. of neutrons

So,

No. of neutrons = 27 - 13 = 14

• Valence electrons are the electrons which are present in the outermost shell of an element.

Electronic Configuration of Y = 2,8,3

So, Y has 3 valence electrons.

• We know that Y is Aluminium & Aluminium is a metal. So , Y is a metal.

• Valency of Y = +3

Answer:

D) a solid to a liquid

Explanation:

EDGE 2022

Answer:

blizzard because it is cold and rainy all the time.

Explanation:

Blizzard is a natural disaster that is least likely to occur in Maryland.

Maryland was a home to 7th state in united states. Maryland’s most common natural disasters include :

Maryland has been impacted by several floods. Hurricane season begins one June 1st. Different storms are seen in Maryland.  There are two types of disaster manmade and natural. Floods, volcanoes are natural disasters.

Maryland has vast variety of tropological features which include lakes, rivers, mountains and pine forests. Blizzard is a dangerous weather event, it is a snowfall.

Therefore, Blizzard is a natural disaster that is least likely to occur in Maryland.

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Answer:

livermorium

Explanation:

The atom with the largest number of neutrons is a tie between livermorium and tennessine. Each of these atoms contain 177 neutrons.

In general, the partitioning of an alkene, alcohol, and acid in an extraction mixture depends on their solubility and the nature of the solvent used.

Alkene: Alkenes are typically nonpolar or slightly polar compounds. In an extraction process, alkenes are more likely to partition into nonpolar solvents, such as organic solvents like diethyl ether or hexane. They will tend to form a separate layer in the extraction mixture known as the organic layer. Alcohol: Alcohols are polar compounds due to the presence of the hydroxyl (-OH) group. Their solubility depends on the length of the carbon chain and the polarity of the solvent. Lower molecular weight alcohols (such as methanol or ethanol) are more soluble in water, which is a polar solvent. Higher molecular weight alcohols may exhibit lower solubility in water and preferentially partition into the organic layer.

Acid: Acids can vary in their solubility depending on their strength and the solvent used. Strong acids, such as mineral acids (e.g., hydrochloric acid, sulfuric acid), are typically highly soluble in water due to their ionization. Weak organic acids may also be somewhat soluble in water. However, if the organic acid is relatively nonpolar, it may partition into the organic layer. It's important to note that the actual partitioning behavior can be influenced by factors such as temperature, pH, concentration, and the presence of other compounds. The choice of solvents and their polarity will determine the distribution of the alkene, alcohol, and acid between the aqueous and organic layers in an extraction process.

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The difference in degrees Fahrenheit between the maximum expected temperatures by the end of the century between the lower and higher emissions scenarios can vary depending on various factors and assumptions.

However, in general, the lower emissions scenario is expected to result in a lower increase in global temperatures compared to the higher emissions scenario.

This means that the maximum expected temperature rise by the end of the century under the lower emissions scenario would be lower than that of the higher emissions scenario.

The specific temperature difference would depend on the specific projections and models used, but it highlights the significant impact that emissions reductions can have on mitigating future temperature increases.

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The correct way to record this measurement using the correct number of significant figures is 6.35 cm.

Measurements are taken with a certain number of significant figures.

The number of significant figures in a measurement depends on the uncertainty in the measurement of the instrument.

The level of uncertainty in the measurement of a cm ruler is ±0.05 cm.

Considering the measurement of the nail:

The measurement of the nail is 6.3 ±0.05 cm.

Therefore, the correct way to record this measurement using the correct number of significant figures is 6.35 cm.

In conclusion, the number of significant figures in a measurement depends on the uncertainty in the instrument.

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The concentration of salt in the tank when water starts to overflow is 12 grams per gallon.

To find the concentration of salt in the tank when water starts to overflow, we need to determine the amount of salt in the tank at that point and divide it by the total volume of water.

First, let's calculate the amount of salt that flows into the tank per minute:
8 grams of salt per gallon * 3 gallons per minute = 24 grams of salt per minute.

Next, let's calculate the amount of water that flows out of the tank per minute:
2 gallons per minute.

The net change in the volume of water in the tank per minute is:
3 gallons per minute - 2 gallons per minute = 1 gallon per minute.

Since the initial volume of water in the tank is 50 gallons and the net change in volume is 1 gallon per minute, the time it takes for the water to overflow is:
(100 gallons - 50 gallons) / 1 gallon per minute = 50 minutes.

Therefore, after 50 minutes, the tank will overflow.

To find the concentration of salt in the tank at that point, we need to calculate the total amount of salt in the tank after 50 minutes:
24 grams per minute * 50 minutes = 1200 grams.

The total volume of water in the tank is 100 gallons, and since the tank overflows after 50 minutes, the amount of water in the tank is 100 gallons.

Therefore, the concentration of salt in the tank when water starts to overflow is:
1200 grams / 100 gallons = 12 grams per gallon.

So, the concentration of salt in the tank when water starts to overflow is 12 grams per gallon.

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The molar mass of the protein is 16,922.73 g/mol.

Given:

A protein sample, with 1 atom of iron in its chemical formula.

The mass percent of iron in the protein is 0.330%.

To find:

The molar mass of protein

Solution:

The mass percentage of iron in protein = 0.330%

The atomic mass of iron = 55.845 g/mol

Number of iron atoms in protein = 1

The molar mass of protein = M

The mass percentage of elements in a compound is given by:

\(=\frac{\text{Atomic mass of element}\times \text{Number of atoms of element}}{\text{Molar mass of compound}}\times 100\)

The percentage of iron in the protein will :

\(0.330\%=\frac{55.845g/mol\times 1}{M}\times 100\\\\M=\frac{55.845g/mol\times 1}{0.330}\times 100\\\\=16,922.73 g/mol\)

The molar mass of the protein is 16,922.73 g/mol.

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Answer:

The right response is "28.13 mL".

Explanation:

The given values are:

Initial buret reading,

= 20.29 mL

Final buret reading,

= 48.42 mL

Now,

The dispensed titrant will be:

= \(Final \ reading - Initial \ reading\)

= \(48.42-20.29\)

= \(28.13 \ mL\)

If 25 milliliter of 0. 80M HCl is used to completely neutralize 40. milliliters of NaOH solution, the molarity of the base is 0.5M.

The molarity of a solution can be calculated using the following expression:

M1V1 = M2V2

Where;

25 × 0.80 = 40 × M2

20 = 40M2

M2 = 20/40

M2 = 0.5M

Therefore, if 25 milliliter of 0. 80M HCl is used to completely neutralize 40. milliliters of NaOH solution, the molarity of the base is 0.5M.

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Answer:

D

Explanation:

A substance is made up of chemicals

The 20-liter sphere test is a standardized test used to determine the flammability characteristics of gases and vapors. Ignition can be achieved in many ways spark, chemical ignitor, exploding fuse wire.

Spark: A spark can be used to ignite the gas or vapor inside the sphere. The spark ignites the gas or vapor by creating a high-temperature plasma that initiates a chemical reaction and ignites the fuel. Chemical igniter: A chemical igniter can also be used to initiate ignition in the 20-liter sphere test. The chemical igniter contains a mixture of chemicals that react with each other when ignited, producing a high-temperature flame that ignites the gas or vapor inside the sphere. Exploding fuse wire: An exploding fuse wire can be used to ignite the gas or vapor inside the sphere. The fuse wire contains a small explosive charge that detonates when an electric current is applied, producing a high-temperature flame that ignites the gas or vapor. Hot wire: A hot wire can also be used to initiate ignition in the 20-liter sphere test. The hot wire is heated to a high temperature using an electric current, and the hot surface of the wire ignites the gas or vapor inside the sphere.

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The compound name for the chemical formula FeCO₃ is iron(II) carbonate.

Fe: The symbol "Fe" represents the chemical element iron.

CO₃: The symbol "CO₃" represents the carbonate ion, which consists of one carbon atom (C) bonded to three oxygen atoms (O).

The compound's name is iron(II) carbonate, which indicates the oxidation state of iron in the compound. In this case, the Roman numeral II (2) in parentheses after "iron" denotes that the iron atom has a +2 oxidation state. The name "carbonate" indicates the presence of the carbonate ion.

Therefore, FeCO₃ is composed of one iron (Fe) atom bonded to one carbonate (CO₃) group.

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As it relates to acid-base titrations, high crystallinity, low stability, and low hygroscopicity are standards (to reduce weight fluctuations due to humidity).

A primary known concentration is a highly pure, low-reactive solution. A presumptive test is less pure than a prime standard and more chemically reactive. The key distinction between the secondary and primary standard solutions is this.

To get the greatest and most accurate result from a standardization titration, a variety of main standards could be employed. High purity, stability, and minimal hygroscopicity are some of these requirements.

A high purity indicates that the reactants are free of contaminants that might influence the outcome. Additionally, stability guarantees that there will be no reaction with atmospheric elements or chemicals when low Weight variations caused by humidity are avoided thanks to hygroscopicity.

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It’s A) (0.1978)(10.01) + (0.8022)(11.01)

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore option A is correct option.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Mathematically,

average atomic mass=  ∑(relative abundance x mass of isotope)

average atomic mass boron= (relative abundance boron-10  x mass of isotope boron-10)+(relative abundance boron-11  x mass of isotope boron-11 )

average atomic mass boron=(0.1978)(10.01) + (0.8022)(11.01)

Therefore option A is correct option.

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Answer:

Al₂O₃

Explanation:

When writing the correct compound, you need to take the charges of both ions into account.

Aluminum (Al) has an ionic charge of +3.

Oxygen (O) has an ionic charge of -2.

The ionic compound should have an overall charge of 0 (neutral). Evidently, the charges of the ions don't balance out if you were to form a compound with just one aluminum and one oxygen (making an overall charge of +3 - 2 = +1).

To fix this, make the charge of each ion the subscript of the other element.

This makes the compound:

Al₂O₃

Now, the aluminum is contributing +6 (2 x +3 = +6) and oxygen is contributing -6 (3 x -2 = -6). This balanced the compound and results in an ionic compound with no overall charge.

The boiling point of ethanol on the Kelvin scale is (273.15+78.3) = 351.45 approximately.

International consensus establishes the ice point and steam point as the two fixed points that make up the Celsius temperature scale. The steam point is established at 100° Celsius, while the ice point is 0° Celsius.

The proportion of 1/273.15 of the thermodynamic temperature of water's triple point is the definition of a Kelvin. The Kelvin is also known as the thermodynamic temperature scale.

As a unit for a unit, both scales are connected. A change of one unit on the Kelvin scale corresponds to a change of one degree on the Celsius scale. These two scales are identical save from the thermometer zero points.

As a result, the conversion formula is: add 273.15 to convert degrees Celsius to Kelvin, and remove 273.15 to convert Kelvin to degrees Celsius.

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Answer:

Boiling point: physical

Density: physical

Ductility: physical

Heat of combustion: chemical

Explanation:

Chemical properties can only be analyzed by putting the substance through a chemical reaction, such as combustion.

Physical properties can be analyzed without altering the substance chemically. With that in mind:

Boiling point is the physical property, density is the physical property, ductility is also a physical property but combustion of heat is a chemical property.

A physical property is the characteristic of a substance or compound that is observed without any change in the identity of the particular substance.

The physical properties of a substance is its colour, hardness, density, and melting as well as boiling points.

A physical property is a characteristic of matter that involves in physical change and physical changes are reversible and there is no production of any new substance.

The chemical change is the property of a substance due to which new substances are formed and it is non reversible change.

The chemical properties are flammability, toxicity, heat of combustion, coordination number, enthalpy of formation, and oxidation states.

Therefore, Boiling point is the physical property, density is the physical property, ductility is also a physical property but combustion of heat is a chemical property.

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The bond between Na and O in NaOCH3 is ionic. The bond between O and C in the molecule is polar covalent, and the bonds between C and H in the molecule are nonpolar covalent.

The NaOCH3 molecule is composed of three different types of bonds: Na-O, O-C, and C-H. The bond between sodium and oxygen is an ionic bond. Sodium is a metal and oxygen is a non-metal, and their electron configuration difference results in a transfer of electrons from sodium to oxygen. This results in the formation of sodium and oxygen ions, Na+ and O-, respectively. The O-C bond is a polar covalent bond, where the electron pair is shared between the two atoms but not equally. Oxygen is more electronegative than carbon, resulting in an uneven distribution of electrons, causing the bond to be polar. The C-H bond is a nonpolar covalent bond, as carbon and hydrogen have similar electronegativity values and thus the electron pair is shared equally between them.

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Complete question:

For NaOCH3, identify each bond as polar covalent, nonpolar covalent or ionic; NaO, OC, and CH.

Answer:

Gram

Centi-

Centimeter

Kilogram

Decimeter

Liter

Decimal System

Kilo-

Kilometer

Area

The unusually high boiling point of water (H2O) is primarily due to the presence of hydrogen bonding between water molecules. This unique intermolecular force is responsible for the exceptional properties of water, including its high boiling point.

Hydrogen bonding occurs when the hydrogen atom in one water molecule is attracted to the oxygen atom in a neighboring water molecule. This attraction is a result of the large electronegativity difference between oxygen and hydrogen. Oxygen is highly electronegative, causing a partial negative charge (δ-) on the oxygen atom and a partial positive charge (δ+) on the hydrogen atoms.

As a result of hydrogen bonding, water molecules form a network of intermolecular attractions, leading to a higher amount of energy required to break these bonds and convert water from the liquid phase to the gas phase. The energy required to disrupt the hydrogen bonds and convert water into vapor manifests as a higher boiling point compared to other substances with similar molecular weights.

Additionally, the presence of hydrogen bonding also contributes to other properties of water, such as its high specific heat capacity, density anomalies, and surface tension, which are vital for the maintenance of life and various natural processes.

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Answer:

CHEMICAL REACTION : A process in which new substances with new properties are formed from one or more substances.

Examples of chemical reactions : Digestion of food, respiration, rusting of iron, burning of magnesium ribbon, formation of curd etc.

Answer:

Explanation:

Chemical reaction is one or more reactants react with each other to from new products.

The four types of reactions are combination, decomposition, single displacement and double displacement.

Here, correct answer will be

Combination reactions involve two reactants combining to form one product. For example, when sodium and chlorine react to form table salt (sodium chloride).

Decomposition reactions are the opposite of combination reactions - one reactant breaks down into two or more products. For example, when water decomposes into hydrogen and oxygen.

Single displacement reactions involve one reactant displacing another from a compound. For example, when magnesium replaces hydrogen in water to form magnesium hydroxide.

Finally, double displacement reactions involve two reactants exchanging parts of their molecules to form two different products. For example, when sodium hydroxide and hydrochloric acid react to form sodium chloride and water.

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