If ethanol (S.G. = 0.790) were used rather than water in measuring the density of the irregular objects, how would that have affected the results? Explain.

Atoms are tiny, tiny pieces of matter that cannot be broken apart any further.

Atoms are the basic units of matter and the smallest particles that retain the properties of an element. Atoms are composed of a nucleus that contains protons and neutrons, surrounded by electrons that orbit around the nucleus.

Atoms cannot be broken down any further by chemical or physical means without losing their identity as the element they belong to.

The properties of atoms determine the characteristics of the matter they make up, and the arrangement of atoms in molecules determines the properties of compounds. The study of atoms and their behavior is the foundation of modern chemistry.

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(-25C / 1) 1 electron divided by 1.60x 1019 C results in 1.6 x 1020 electrons. Water has a mass of 18 g per mole. (1 / (1.6 x 1020 electrons) 1 molecular to 1 electron (6.02 x 1023 molecules/one mole) 4.8 x 103 g = (18g/mole)

It is possible for an electron, a negatively charged subatomic particle, to be either free or bonded to an atom (not bound). An electron is attached to an atom and is one of the three major types of particles in an atom.

A positively charged atom's structural constituents are called electrons. An atom's total negative charge of its electrons equals the positive charge of its protons in the atomic nucleus.

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The number of valence electrons determines if an extrinsic material produced is p-type or n-type.

In semiconductors, valence electrons are responsible for the electrical conductivity of the material. Valence electrons are the outermost electrons of an atom that participate in chemical reactions and bond formation.

The type of extrinsic material produced depends on the type of dopant used and the number of valence electrons in the dopant.

The dopant is added to the intrinsic semiconductor in small quantities to increase its conductivity.The dopant atom replaces a semiconductor atom in the crystal lattice, causing the number of valence electrons to change.

If the dopant has fewer valence electrons than the semiconductor atom it replaces, it is called a p-type dopant because it leaves a hole (a positive charge carrier) behind when it bonds with other atoms in the lattice.

When the dopant has more valence electrons than the semiconductor atom it replaces, it is called an n-type dopant because it introduces an extra electron (a negative charge carrier) into the lattice.

Hence, the number of valence electrons determines if an extrinsic material produced is p-type or n-type.

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The concentration of the unknown solution will be 50ml.

Measure the volume V1 of the solution with concentration C1. Then, add enough diluting liquid (water, etc.) to make a total volume V2.

The given data:

V1 = 100 ml

V2 = ?

c1 = 2.10

C2 = 4.2

The relation between concentration and volume can be expressed as:

V1C1 = V2C2

Put the value of given data in above formula:

V2 = V1C1/C2

V2 =  100 ml×2.10 / 4.2

V2 =  50 ml

The concentration of the sample of be 50ml

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Answer:

ammonia molecules. Similar factors may be derived for any pair of substances in any chemical equation. Example 4.8. Moles of Reactant Required in a Reaction.

Explanation:

Answer:i am doing

good

Explanation:

Invented by Bernard Launy and Jeremie Metz, flaws in the system in terms of energy inputs and outputs is the overbalanced wheel in which spokes are attached

Energy is the ability to do work to cause changes in matter

The overbalanced wheel perpetual motion machine is one of the most commonly proposed perpetual motion machine designed and wheel is designed to turn clockwise just after the weighted spoke reaches the top of the wheel and the spoke flip outward to the right exerting the force downward toward the ground and some energy will be lost from friction as the mechanism rub on the inner spoke and more energy will be lost when it transferred into sound and thermal energy

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Answer:

sodium proxide

Explanation:

Answer: what would swimming in mathane lake on titan feel like.

Explanation:

Both methane and titan are gases that are combustible in nature.

Those gases which are inflammable are called combustible gases.

For example:-

These gases have various uses in daily life. these uses as follows:-

The gas will mix in the lake which harms the aquatic animals. The aquatic animals have a hard time to breath.

Hence, the lake will be polluted.

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If someone who look up to does anything that makes you want to do something, this is known as direct pressure directly from the other person's mouth. The plan you use to accomplish the goal it your activity.

The Standard unit for pressures seems to be the pascal (Pa), which is equal to one newton / square meter (N/m2) of pressure is defined of surface. An object's pressure is inversely related to its force and proportional to both

Pressure is created by molecules moving quickly and crashing into the container's walls. The quantity and intensity of molecular collisions in a given region determine the pressure there.

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Answer:

No

Explanation:

The combustion of one mole of methane releases 802.3 kilojoules of energy is equal to 191.7 kilocalories.

Kilojoules are the units used to measure the energy that comes from food and liquids (kJ). Calorie is known as this in metric systems. Calories and kilojoules are equivalent units of energy. Four kilojoules make up one calorie. Kilojoules can be converted to calories and vice versa with ease.

The quantity of heat needed to raise one kilogramme of water by one degree Celsius is known as a kilocalorie, or food calorie. In order to increase a gramme of material one degree Celsius under constant pressure, a certain quantity of heat must be applied.

Step 1: Write down the given information.
Energy released from combustion of one mole of methane = 802.3 kJ

Step 2: Use the conversion factor between kilojoules and kilocalories.
1 kcal = 4.184 kJ

Step 3: Convert the energy from kJ to kcal.
(802.3 kJ) * (1 kcal / 4.184 kJ) = 191.7 kcal

The combustion of one mole of methane releases approximately 191.7 kilocalories of energy.

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The pH of a 0.10 M solution of this acid that has been one-quarter neutralized if a diprotic acid has a pka1 = 3.10 and pka2 = 6.50 is 8.7.

To find the pH of the diprotic acid solution, we need to first determine the concentration of the undissociated acid that is left in the solution after one-quarter of it has been neutralized. One-quarter of the acid has been neutralized, which means that half of the acid that dissociated in the reaction was neutralized. Let x be the concentration of the undissociated acid that is left in the solution. Then, the concentration of the first dissociated H+ ion will be (0.10-x)/2. The concentration of the second dissociated H+ ion will be (0.10-x)/4.

Using the Henderson-Hasselbalch equation, we can write:

pH = pKa + log([A-]/[HA])

where [A-]/[HA] is the ratio of the concentration of the conjugate base to the concentration of the undissociated acid.

For the first dissociation, we have:

pH1 = pKa1 + log([A-]/[HA])

= 3.10 + log((0.10-x)/((0.10-x)/2))

Simplifying this equation, we get:

pH1 = 3.10 + log(2) - log(0.10-x)

Now, for the second dissociation, we have:

pH2 = pKa2 + log([A-]/[HA])

= 6.50 + log((0.10-x)/((0.10-x)/4))

Simplifying this equation, we get:

pH2 = 6.50 + log(4) - log(0.10-x)

Since one-quarter of the acid has been neutralized, we know that the moles of H+ ions that have been removed are equal to one-quarter of the initial moles of acid. This means that the moles of the undissociated acid that are left are equal to 0.75 times the initial moles of acid, or 0.075 moles. Therefore, the concentration of the undissociated acid is 0.075 M, and we can plug this value into the above equations to get:

pH1 = 3.10 + log(2) - log(0.025) = 2.97pH2

= 6.50 + log(4) - log(0.025)

= 8.7

Since the first dissociation is much more acidic than the second dissociation, the pH of the solution after one-quarter neutralization will be close to the pH after the first dissociation. Therefore, the pH of the solution will be approximately 8.7.

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Explanation:

colloid is a mixture in which one substance of microscopically dispersed insoluble particles are suspended throughout another substance. However, some definitions specify that the particles must be dispersed in a liquid,[1] and others extend the definition to include substances like aerosols and gels. The term colloidal suspension refers unambiguously to the overall mixture (although a narrower sense of the word suspension is distinguished from colloids by larger particle size). A colloid has a dispersed phase (the suspended particles) and a continuous phase (the medium of suspension). The dispersed phase particles have a diameter of approximately 1 nanometre to 1 micrometre.[

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Answer:

colloids are mixtures in which one or more substances are dispersed as relatively large solid particles or liquid droplets throughout a solid ,liquid or gaseous medium .The particles of a colloid remain and do not settle due to gravity ,and they are often electrically charged

When the electrons in an atom transition between energy levels, according to Bohr, an atomic spectrum is produced. When energy is absorbed, the electrons would leap to a greater energy level than they normally would, creating an excited and unstable condition. Electrons ordinarily have the lowest energy attainable.

The characteristic wavelengths of electromagnetic radiation (or a subset of it) that are released or absorbed by a material, atom, or molecule are known as a spectrum.

The term "spectrum" alludes to how various people experience autism in a variety of ways; autism is a condition that is highly diverse. Autism is seen as a spectrum disorder because each autistic person experiences it differently. Some autistic people may require more care than others in order to live the lifestyles they desire.

The sun's spectrum of colors, the rainbow, and a molecule's infrared absorption wavelengths are a few examples of spectra.

Continuous, emission, and absorption spectra are the many types.

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Answer:

3H2 + N2 ---> 2NH3

Explanation:

The redox reaction which would most likely occur if silver and zinc metal were added to a solution that contained silver and zinc is Zn + Ag\(^+\) \(\rightarrow\)Zn\(^2+\) + 2 Ag .

Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.

While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.

The ion or molecule which accepts electrons is called as oxidizing agent while the ion or molecule which donates electrons is called as a reducing agent.

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Answer:

A. Carbon, Hydrogen, Nitrogen, and Oxygen

B. 12(14) + 1(18) +12(2)+16(5)= 294.20g

C. 7.35/294.3=0.0250mol

D. 5.88g/294.3=0.01997961264 × 6.02 × 10^2= 12.028

Explanation:

The correct answer is that proton is the subatomic particle that gives the nucleus an overall positive charge.

A proton is a stable subatomic particle with the designations p, H+, or 1H+ with an electric charge of +1 e. (elementary charge). Its mass is just somewhat less than a neutron and 1,836 times more than that of an electron (the proton–electron mass ratio). Protons and neutrons, which have masses of around one atomic mass unit each, are together referred to as "nucleons" (particles present in atomic nuclei).

One or more protons can be found in the nucleus of every atom. They provide the main electrical attraction and holding power for the atomic electrons. An element may be identified by its atomic number, which is the quantity of protons in its nucleus (represented by the symbol Z).

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In the periodic table, group numbers are the number of valence electrons present in valence shells of an atom.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

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The periodic table with masses is very useful as the atomic mass is the average number of protons and neutrons in atoms of a chemical elements, which allows for the natural abundances of the element's isotopes.

Generally, atomic mass of an element is defined as the number of times an atom of that element which is heavier than an atom of carbon taken as 12. Basically, one atomic mass unit is equal to one-twelfth of the mass of an atom of carbon 12 isotope.

In the modern periodic table atomic number is present at the upper left, or number of protons. And in the middle the letter is the symbol used for the element (e.g., H). And below is the relative atomic mass, as calculated for the isotopes found naturally on Earth. Finally at the very bottom is the name of the element (e.g., hydrogen).

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Answer:

An element contains just one type of atom. A compound contains two or more different atoms joined together. A mixture contains two or more different substances that are only physically joined together, not chemically. A mixture can contain both elements and compounds.

The reaction that would result in decreased entropy is : ( A ) CO(s) → CO2(g)

Reactions that absorb heat from its surroundings are known as endothermic reactions, Endothermic reactions result in a decreased entropy as the temperature of the surrounding becomes lower than the temperature of the container where the reaction occurs.

Examples of endothermic reactions are : melting and evaporation which results in the change of state from solid to liquid or from solid to gaseous state.

Hence we can conclude that The reaction that would result in decreased entropy is : ( A ) CO(s) → CO2(g)

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Answer:

b. forest ....

I think ansesters also lived in forest by wearing leaves like their clothes .... etc

Guidelines for accidental contact is the section in which each type of information can be found on a safety data sheet.

The safety data sheet (SDS) contains details about each chemical's characteristics, potential physical, mental, and environmental health risks, counter measures, and safety instructions for handling, storing, and transporting the chemical.

Guidelines for accidental contact: First aid measures; chemical name; identification of potential hazards; compatibility; handling; PPE; and exposure controls. Hazards and suggestions for chemicals are:

Chemical hazards are various chemical chemicals that can be harmful to human health. The First-Aid Measures are a set of suggestions on how to lessen the consequences brought on by unintentional exposure to a certain chemical threat. Personal protection equipment (PPE) is a category of specially made equipment that shields an employer from workplace safety threats.

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The complete question is

Identify the section in which each type of information can be found on a Safety Data Sheet.

recommendations in case of accidental contact with the chemical Choose...

chemical name and formula Choose...

possible dangers and health effects Choose...

incompatibility or reactivity with other chemicals Choose...

recommended personal protective equipment (PPE) Choose...