What is the density of an object if it’s mass is 15 g and it’s volume is 3cm3

Answer:

1.6 × 10²³ molecules of N2O5

Explanation:

To find the amount of molecules from the amount of moles of a substance we simply multiply the amount of moles by Avagadro's number.

0.27mol × 6.02×10²³ = 1.6 × 10²³ molecules of N2O5

Answer and explanation:

1. To increases the accuracy of the measurement, the person should try to make sure the ruler is parallel to the object they are measuring. If they measure the object with the ruler not being parallel the measurement will end up larger then expected. To increase the precision the person must measure with the ruler in the same position each time.

2. A situation in which a set of measurements are precise but not accurate could be if a student measured an object at an incorrect angle many times, like the inaccurate measuring in the image above. All of the measurements would be inaccurate, but since they were all measured inaccuratly the same way, they will be precise.

3. An objects mass is defined as being the amount of matter in said object. An objects weight is defined as being the force exerted on an object by gravity. Although the man would weigh less on the Moon because there is less gravity, he still would not fit in his clothes because his mass has not changed.

Answer:

Covalent bond

Explanation:

Covalent bond:

"The bond which is formed by the sharing of electrons between the atoms is called covalent bond"

The covalent bond is less stronger than ionic bond so require less energy to break as compared to the energy require to break the ionic bond.

The covalent bond is present between the oxygen molecule. It is the bond which is formed by the sharing of electrons between the two atoms of oxygen. Oxygen is present in group six of periodic table so there are six valance electrons are present. Oxygen molecules is formed by sharing the two valance electrons by each oxygen atom, thus double covalent bond is present in oxygen molecules. This is represented as O=O and two lone pairs are still present on each oxygen atom.

Answer:

two covalent bonds

Explanation:

Oxygen atoms can form two covalent bonds, so to link the two oxygen atoms together, a double bond forms between them.

Answer:the man speaks the truth

Explanation:

Alkaline earth metals are in group 2 of the periodic table, forming alkaline solutions when their oxides react with water. They have higher ionization energies and smaller atoms than alkali metals, which makes them less reactive. In chemical reactions, they lose their valence electrons and exhibit a 2+ oxidation state.

The alkaline earth metals, which include beryllium, magnesium, calcium, strontium, barium, and radium, are part of group 2 of the periodic table. Characteristically, these metals form alkaline solutions when their oxides react with water. Additionally, these alkaline earth metals possess smaller atoms and have higher first ionization energies than the alkali metals existing within the same period. This contributes to their lower reactivity in comparison to alkali metals, though they are still highly reactive on their own.

A defining trait of these metals is that they readily lose both their valence electrons in chemical reactions, which leads them to exhibit an oxidation state of 2+. Furthermore, they have a completed s subshell in their outermost shell. The reactivity of these metals escalates with an increase in their size and a decrease in ionization energy.

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Answer:

20.3-17.5=2.8ml  1ml=1cm3   vol= 2.8cm3

Explanation:

The volume of the metal cube is calculated by subtracting the original volume of water in the cylinder (17.5 ml) from the volume after the cube was placed in the cylinder (20.3 ml), resulting in a cube volume of 2.8 cm³.

The volume of the metal cube that was placed in the graduated cylinder can be calculated from the change in water level. At the beginning, the cylinder contained 17.5 ml of water. When the metal cube was placed into the cylinder, the water level rose to 20.3 ml. The volume of the cube in cubic centimeters (cm³) or milliliters (ml), since 1 cm³ = 1 ml, can be determined simply by subtracting the original volume of water from the final volume.

So, the calculation is as follows: 20.3 ml - 17.5 ml = 2.8 cm³. Therefore, the volume of the metal cube is 2.8 cm³.

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Answer:

K

Explanation:

The key aspect in this question is to look for Ionization Energy (EI), which describe the needed energy to take out an electron. Thefore, the potasiumm need lower energy . Another important thing is analyze how K will take nobel gas electron configuration when loss 1 electron, this It will be more stable

Answer:

Heating a substance causes molecules to speed up and spread slightly further apart, occupying a larger volume that results in a decrease in density. ... Hot water is less dense and will float on room-temperature water. Cold water is more dense and will sink in room-temperature water.

Explanation:

Answer: it keeps the temperature more even

Explanation:

Answer:24.14g Cl

Explanation:

Convert to moles

4.1 x 10^23 atoms Cl x (1 mol/6.022 x 10^23 stoms) = 0.68 moles

Convert from moles to grams using the molar mass by periodic table

0.68moles(35.45g/1 mol) = 24.14g Cl

To determine the mass of 4.1 x 10²³ atoms of Cl, we calculate the number of moles using Avogadro's number and then convert to grams using the molar mass of chlorine. The mass is 24.14 grams.

To determine the mass of 4.1 x 10²³ atoms of chlorine (Cl), we need to use Avogadro's number and the molar mass of chlorine.

First, we find out how many moles of Cl atoms are present by using Avogadro's number (6.022 x 10²³ atoms/mol):

Next, we use the molar mass of chlorine, which is 35.45 grams per mole, to convert moles to grams:

Therefore, the mass of 4.1 x 10²³ atoms of Cl is 24.14 grams.

Answer:

The reactivity of an element From left to right.

Explanation:

The most reactive are on the right while the least reactive elements towards the left.

He observed that the physical and chemical properties of elements were related to their atomic mass in a repeating or in a periodic manner.

Dmitri Ivanovich Mendeléev was a Russian chemist and perhaps the most important person who contributed to the early development of the periodic table. Many periodic tables were made before him but the most important one till then was the Mendeleev periodic table.

After the rejection of Newlands Octave Law, in 1869, Mendeleev's Periodic table came was bought into the picture. In Mendeleev’s periodic table, elements were arranged according to the fundamental property of their atomic mass, and chemical properties.

During Mendeleev’s work, there were only 63 elements that were known. After he finished studying the properties of every element, Mendeleev found that the properties of elements were related to atomic mass in a repeating or periodic manner. That is why he arranged the elements in a manner where the elements that had similar properties were in the same vertical columns of the periodic table.

Therefore, he observed that the physical and chemical properties of elements were relating to their atomic mass in a repeating or in a periodic manner.

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Answer:

The two reactants for photosynthesis are carbon dioxide (CO₂) and water (H₂O).

Explanation:

The equation for photosynthesis is as following:

6CO₂ + 6H₂O => C₆H₁₂O₆ + 6O₂

The reactants of a chemical reaction are the chemicals before the arrow, before the reaction takes place. In the equation above the reactants are carbon dioxide (CO₂) and water (H₂O).

Final answer:

Photosynthesis occurs in two stages: light-dependent reactions and the Calvin cycle. The light-dependent reactions convert sunlight into chemical energy and release oxygen. The Calvin cycle uses this energy to capture carbon and assemble sugar molecules.

Explanation:

Photosynthesis takes place in two stages: the light-dependent reactions and the Calvin cycle. In the light-dependent reactions, chlorophyll absorbs energy from sunlight and converts it into chemical energy with the aid of water. The light-dependent reactions release oxygen as a byproduct from the splitting of water. In the Calvin cycle, the chemical energy derived from the light-dependent reactions drives both the capture of carbon in carbon dioxide molecules and the subsequent assembly of sugar molecules.

Answer:

m= 29.645 g

Explanation:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

Given data:

density of wood = 0.77 g/cm³

volume= 38.5 cm³

mass= ?

Solution:

d= m/v

m= d × v

m= 0.77 g/cm³× 38.5 cm³

m= 29.645 g

Final answer:

The mass of a 38.5 cm3 piece of American white oak wood from the pile would be 29.645 g.

Explanation:

The density of American white oak wood is generally 0.77 g/cm³.

To calculate the mass of a 38.5 cm³ piece of wood from the pile, we can use the formula:

Mass = Density x Volume

Therefore, the mass of the wood would be: 0.77 g/cm³ x 38.5 cm³ = 29.645 g.

Answer:

Atomic number

Explanation:

The number of protons in an atom determines its atomic number, which is unique to each element and also indicates the number of electrons in a neutral atom.

The number of protons in one atom of an element determines the atom's atomic number, and the number of electrons determines the chemical properties of an element. Atoms of each element contain a characteristic number of protons, and this number is unique to that element. For example, any atom containing one proton is hydrogen and has the atomic number 1. The atomic number not only distinguishes one element from another but also signifies the number of electrons in a neutral atom, since the number of protons equals the number of electrons. Therefore, the atomic number of an element defines both its identity and the number of electrons in its neutral state. Scientists use the atomic number to identify and categorize elements, with known elements' atomic numbers ranging from 1 (hydrogen) to 118 (Oganesson).

Answer:

They dissolved into the water, forming a mixture.

Explanation:

The salt is sodium chloride (NaCl) and the sugar is a dissacharide which contains many hydroxyl  groups (-OH). Both of them are very soluble in water, but they will not start a chemical reaction between themselves.

Dissolving them in water will form a mixture of chloride ions (Cl⁻), sodium ions (Na⁻) and sugar molecules.

All cells share common features such as a plasma membrane, cytoplasm, DNA, and ribosomes. However, prokaryotic and eukaryotic cells have some differences.

All cells share four common components: 1) a plasma membrane, an outer covering that separates the cell's interior from its surrounding environment; 2) cytoplasm, consisting of a jelly-like cytosol within the cell in which other cellular components are found; 3) DNA, the genetic material of the cell; and 4) ribosomes, which synthesize proteins. However, prokaryotes differ from eukaryotic cells in several ways.

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Yes, all cells share some common features.

Even though there is a great diversity in cell types, shapes, and functions, every cell has the following basic structures in common:

Plasma Membrane: This is the outer covering of the cell, which separates the cell's interior from its surrounding environment. It controls the movement of substances in and out of the cell.

Cytoplasm: This is the gel-like substance inside the plasma membrane. It contains all the cell's organelles and is the site where most cellular activities occur.

DNA: All cells have DNA as their genetic material. DNA carries the instructions needed for the cell to grow, reproduce, and function.

Ribosomes: These are the particles that synthesize proteins, which are essential for the cell's structure and the functions it performs.

These shared features suggest a common ancestry among all living organisms. Despite their variety, these fundamental characteristics are crucial for the essential processes that all cells must perform, such as transportation of materials, obtaining and using energy, waste disposal, replication, and responding to their environment.

To find the number of grams of O in 905 grams of Na2O, we calculate the molar mass of Na2O and O. Then, we use the ratio of moles of O to Na2O to calculate the number of moles of O. Finally, we multiply the number of moles of O by the molar mass of O to find the grams of O.

To calculate the number of grams of O in 905 grams of Na2O, we need to find the molar mass of Na2O and the molar mass of O. The molar mass of Na2O is 46 grams/mol (2*23 for Na + 16 for O) and the molar mass of O is 16 grams/mol.

In Na2O, there are 2 moles of Na for every 1 mole of O. So we can calculate the number of moles of O in 905 grams of Na2O by dividing 905 grams by the molar mass of Na2O, and then multiplying by the ratio of moles of O to moles of Na2O:

Number of moles of O = (905 grams Na2O / 46 grams/mol Na2O) * (1 mole O / 2 moles Na2O) = 9.85 moles O

Finally, we can calculate the number of grams of O by multiplying the number of moles of O by the molar mass of O:

Number of grams of O = 9.85 moles O * 16 grams/mol O = 157.6 grams O

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Answer:

Physical Change

Explanation:

The ice isn't changing what it is, because its still water (even though its in a different form) If you freeze it again it will be exactly the same and so its a Physical Change

Answer:

Melting ice will change to water and windshield will change to very vescus fluid.

Explanation:

Final answer:

Chemical properties of rocks include their ability to react with acids, undergo oxidation, and release substances under certain conditions; they define how rocks interact chemically with their environment.

Explanation:

Chemical Properties of Rocks

Chemical properties are characteristics of a substance that describe its potential to undergo certain chemical changes during reactions. In the context of rocks, these properties are crucial in understanding how they will interact with the environment. For instance, some common chemical properties of rocks include their reactivity with acids, ability to undergo oxidation, and potential to emit substances when exposed to various conditions.

Iron within rocks, for example, has the chemical property of reacting with oxygen and water to form rust, also known as iron oxide. This reaction is a form of corrosion and represents a significant chemical change. Another example is the reaction of calcite, a common mineral in limestone rocks, with acids; this results in the rock fizzing as carbon dioxide gas is released. Many rocks contain minerals that can react to cause a distinct chemical reaction, and identifying those reactions is essential for studying and classifying different rock types.

Answer:

In an endothermic reaction, the products have more stored chemical energy than the reactants. In an exothermic reaction, the opposite is true. The products have less stored chemical energy than the reactants. The excess energy in the reactants is released to the surroundings when the reaction occurs.

Explanation:

Final answer:

Energy released as light or thermal energy in a reaction is typically from exothermic chemical reactions, where more energy is released than required to break bonds. This occurs during the transformation of chemical potential energy into other energy forms such as heat or light.

Explanation:

The energy that can be released as light or thermal energy in a reaction is typically associated with chemical reactions. When the energy required to break the bonds in reactants is less than the energy released when new bonds form in products, the reaction is known as exothermic. Chemical energy, which is stored in the bonds of molecules, is a form of potential energy. During exothermic reactions, this energy is released as either heat or light, which can be observed, for example, as a flame on a kitchen burner fueled by natural gas. If the reaction absorbs more energy than it releases, it is called an endothermic reaction.

Answer:

C

Explanation:

This is the only option that could produce an objective answer through experimentation or studies. The other options can be answered subjectively and are opinion based. They could not be answered scientifically.

The question about how switching from butter to canola oil affects cholesterol levels can be answered scientifically because it involves testable hypotheses and objective data collection.

Among the options provided, the question that can be answered scientifically is

C. how does switching from butter to canola oil affect cholesterol levels in the blood? This is because it poses a question that can be investigated using the scientific method, including forming a hypothesis, conducting experiments, collecting data, and drawing conclusions based on the evidence collected.

Scientific questions often involve understanding natural phenomena, observable events, and the relationships between variables. In comparison, the other questions listed involve personal opinions, morals, or subjective judgments, which are not scientifically testable and depend more on individual or cultural perspectives.

Answer:

Explanation:

Colloidal:

Suspension:

Final answer:

The probability of getting exactly 2 tails when flipping a fair coin 7 times is approximately 16.41%, calculated using the binomial probability formula.

Explanation:

The probability of getting exactly 2 tails when you flip a fair coin 7 times can be calculated using the binomial probability formula, which is given by:

P(X=k) = (n choose k) × (pk) × ((1-p)(n-k))

where:

n is the number of trials (in this case, 7 flips),

k is the number of successful events (in this case, 2 tails),

p is the probability of success on a single trial (for a fair coin, this is 0.5 for getting a tail).

Using the formula, we calculate:

P(X=2) = (7 choose 2) × (0.5²) × ((1-0.5)⁷⁻²)

P(X=2) = 21 × (0.25) × (0.03125)

P(X=2) = 0.1640625

Therefore, the probability of getting exactly 2 tails when flipping a fair coin 7 times is approximately 16.41%.

Some material from meteors lingers in the mesosphere, causing this layer to have a relatively high concentration of iron and other metal atoms. Very strange, high altitude clouds called "noctilucent clouds" or "polar mesospheric clouds" sometime form in the mesosphere near the poles.

I really hope this helps! I wish you the best of luck!

Answer:

The liquid must be water.

Explanation:

The liquid must be water because its density (mass/volume) is                    1 grams/cm³

Answer:

The cost would be $1.68

Explanation:

I found the answer by multiplying

.67x or .67lb with 2.5, getting $1.68

Answer: $3.693

Explanation:

Since an apple costs $0.67 per lb

To get the price for 2.5kg, we need to first convert kg to lb

Since 1kg = 2.205lb

2.5kg = (2.205×2.5)lb

2.5kg = 5.513lb

Since $0.67 = 1lb

$x = 5.513lb

Cross multiplying we have;

x × 1 = 0.67×5.513

x = $3.693

Answer:

C. freezing

Explanation:

Point B is right at the border between a solid and a liquid so you can have two physical changes:

a) solid is meting to transform into a liquid

or

b) liquid is freezing to transform into a solid (C)

If you are on the border between a solid and a gas you have the following physical changes:

solid to gas - sublimation

gas to solid - deposition

If you are on the border between a liquid and a gas you have the following physical changes:

liquid to gas - boiling

gas to liquid - condensation

Answer: It is C

Explanation: got a 100% on this assignment

Answer:

Water and acetone is best by separated through distillation

The correct answer would be option C Acetone and water.

Explanation:

When in a mixture of fluid solution, two liquids are mixed in a form of mixture then these liquid can be separated only one method which is based on the fact. That two different liquids will have two different boiling temperatures which method of separating the Fluids is distillation.  

The different liquids that are  present in mixture are boiled and the vapours are condensed and the condensed portion is  accumulated in another beaker.

Lavoisier and Dobereiner  

I hope this helps!

Answer:

Lavoisier and Dobereiner is the correct answer.

Explanation:

This is the complete question with grammar corrections:

A glass vessel calibrated to contain 9.76 mL at 4° C was found to weigh 22.624 g when empty and dry. Filled with a soduim chloride (NaCl) solution at the same temperature , it was found to weigh 32.770 g. Calculate the solution's density.

Answer:

Explanation:

Density is the physical property that expresses the amount of matter (mass) per voumetric unit of solution:

In this problem, you can first calculate the mass, by difference. After that, you just have to divide the mass by the volume of the glass vessel (9.76 ml as per the calibration).

This is the two steps procedure.

1. Mass of the solution:

       Mass of solution = 32.770 g - 22.624 g = 10.146 g

2. Solution's density:

The density is rounded to 3 significant digits because the volume, which is dividing the mass, was reported with 3 significant digits.

Answer:

The solution density will be 1.04 g/mL

Explanation:

Mass of the solution = mass of the glass vessel with NaCl solution – mass of the empty glass vessel

= 32.770 g - 22.624 g

= 10.146 g

Volume of the solution = 9.76 mL

[tex]density = \frac {mass}{volume} \\\\= \frac {10.146g}{9.76mL}\\\\=1.04 \frac {g}{mL}[/tex]

Thus, the solution density will be 1.04 g/mL.

Answer:physical: a part falling off or changing a tire. chemical:rust

Explanation:

The chemical changes that occur as a car ages are fading of paint due to sunlight. rusting on the chrome, corrosion of electrical wiring. Some physical changes that occur as a car ages are breaking of the handles and straps, wearing down of tyre, paint  scratches.

A chemical change is one which brings change in the composition of the substance. In other words, it is such a change which forms a completely new substance or product. It is an irreversible change.

On the other hand, a physical change is one which brings structural change or change in appearance of a substance without changing its original composition. It is a reversible change.

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