What's the hardness of a mineral that you can't scratch with your fingernail and also scratches glass

Answer:

20 protons, 20 electrons and 24 neutrons

Explanation:

In isotopes, the number of neutrons change, changing the mass number (of the atom)

Excerpt 1:
"In the study, participants who were exposed to a series of logical reasoning exercises showed a significant improvement in their problem-solving abilities compared to the control group, which did not engage in these activities."
This excerpt demonstrates logical thinking and reasoning as it presents the results of a study that examines the impact of logical reasoning exercises on problem-solving abilities. The study design, comparing a group that participated in the exercises to a control group, allows for the isolation of the effect of the exercises and supports the conclusion that logical reasoning activities lead to improvements in problem-solving skills.

Excerpt 2:
"Further analysis of the data revealed a strong correlation between the number of logical reasoning exercises completed and the improvement in participants' problem-solving skills, suggesting that regular engagement in these activities can contribute to enhanced cognitive abilities."
In this excerpt, the relationship between the frequency of engagement in logical reasoning exercises and the improvement in problem-solving skills is explored. The strong correlation mentioned indicates that the more participants engage in these activities, the more their cognitive abilities improve. This analysis supports the idea that practicing logical reasoning can lead to cognitive enhancements, showcasing logical thinking and reasoning in the evaluation of the data.

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The formula for sulfurous acid is A) H2SO3.

Sulfurous acid is a weak acid that is formed when sulfur dioxide (SO2) dissolves in water. The sulfur dioxide reacts with water to form sulfurous acid, which can then ionize to produce hydrogen ions (H+) and sulfite ions (SO32-).

The balanced chemical equation for the formation of sulfurous acid is:

SO2 + H2O → H2SO3

As you can see from this equation, one molecule of sulfur dioxide reacts with one molecule of water to form one molecule of sulfurous acid.

The formula for sulfurous acid reflects the fact that there are two hydrogen ions (H+) and one sulfite ion (SO32-) in the molecule. Therefore, the formula is H2SO3, with the subscript 2 indicating that there are two hydrogen ions in the molecule.

So once again, you are correct that the formula for sulfurous acid is A) H2SO3.

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The melting point of 4-cyclohexene-cis-1,2-dicarboxylic anhydride (often abbreviated as "4-cylohexene-1,2-dicarboxylic anhydride") is approximately 102-103 °C.

The typical definition of the melting point is the temperature at which a substance transforms from a solid to a liquid. The melting point of a liquid is the temperature at which the liquid transforms from a solid to a liquid under atmospheric pressure. This is the location where the liquid and solid phases are equally present.

The temperature at which molecules in a solid can pass one another and transform into a liquid is known as the melting point. On the other hand, liquids and gases are involved in the boiling point.

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Newton's laws of motion are stated and explained below:

First law - an object remains in its state of motion in a straight line unless acted upon by an external force. This explains why moving objects are reluctant to stop and objects are rest are reluctant to move.

Second law - the change in the momentum of a body is directly proportional to the applied force and takes place in the direction of the applied force. This explains why acceleration increases with force.

Third law - action and reaction are equal and opposite.

This means that every force has a balancing force acting in the opposite direction

Newton's laws of motion are the laws that describe the observed phenomena of objects in motion.

The laws of motion are useful in determining the various features of motion in a straight line such as velocity, acceleration, impulse, and momentum.

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Answer:

combination, decomposition, single-replacement, double-replacement, and combustion.

Explanation:

One of the critical resonance properties of peptide bonds is the double bond character of the C-N bond.

The double bond resonance within the peptide bond creates a planar structure with restricted rotation.

The nitrogen atom in the peptide bond contains a non-bonding pair of electrons, which generates a double bond character to the peptide bond. This characteristic is the primary reason that peptide bonds show restricted free rotation and planarity.

Peptide bonds are critical in the formation of polypeptides and proteins. These bonds, along with other interactions between amino acids, allow for the complex folding of proteins.

This feature is crucial in the formation of polypeptides and the folding of proteins. The double bond character of peptide bonds is what gives them their distinctive structure and reactivity, allowing them to form the basis of polypeptides and proteins.

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As the volume of  the sound is seen to increase, the sound that we hear is louder as the amplitude of the sound increases.

Sound is a kind of wave that moves through a medium. We know that sound has to move via several compressions and rare factions. This implies that sound is as well propagated through air. The movement of the sound waves through air is because the air is set into vibration by the sound. Thus, the air is very imprtant in the movement of the sound waves.

With this much said, we can see that if there is more air, there would more molecules that can be set into vibration and the sound wave would tend to increase and that is the deal that we are trying to communicate here.

Thus, the amplitude of air increases as the volume of  the sound gets higher and the sound that we hear is much louder.

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Answer:

A. The gas particles have strong attraction for one another.

Explanation:

The gas particles have a large volume and weak attraction for one another. To correct this statement and make it true, it should be: "The gas particles have a small volume and weak attraction for one another." Gases have large volume, and low density and the particles in a gas are far apart from one another and have very weak attractive forces between them.

Answer: B. The gas particles have almost no

volume.

Explanation:

Alkali metals have only one electron in their outermost energy levels, and they can lose this one electron to form a mono positive ion only. Hence, alkali metals do not form dispositive ions.

Answer:

substances

Explanation:

A chemical reaction happens when substances break apart or combine to form one or more new substances.

^Hope it helps, Hazel^

Based on the assertion and reasons given, it can be seen that the Assertion is true, but the reason is false.

Camphor and ammonium chloride are not separated because they are volatile substances. Hence assertion is true.

Camphor on heating sublimes, only when mixed with sodium chloride so the reason is false.

The bark and wood of the camphor tree were once used to make the chemical known as camphor.

Today, turpentine oil is typically used to make camphor. The fragrance of camphor is quite distinctive. It helps with symptoms like pain and itching by stimulating the nerves, it seems.

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1) There is a new product on the right hand side

2) Magnesium and oxygen

3) The stoichiometric coefficient of the reactants

4) The number of atoms of each of the elements in the molecule

5) At the start of the reaction, the elements are isolated while at the end of the reaction, the elements are combined.

We have to note that when we talk about a chemical reaction we mean the combination of two or more substances so that we can be able to get a product that is different from the reactants.

in this case, we can see that the reaction that has taken place is the combination of the oxygen molecule and the magnesium atom so as to give the magnesium oxide compound.

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Sodium chloride is white, crystalline solid at room temperature.

It is a compound whose components atoms are sodium and chlorine.

The atoms of the two elements combine chemically through an ionic bond. The sodium donates it valence electron to the chlorine atom.

Thus, sodium chloride is an ionic compound. It has a characteristic white appearance and crystalline structure.

The compound is a solid at room temperature. It has a melting point of 801 °C.

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An example of a physical change is the process of tempering steel to form a knife blade.

physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.

Answer:

yes they do because is it quite into te aspects of ciencia

The number of moles of a substance is calculated from the given weight of the substance and its molecular mass by using the formula:

No. of moles = \(\frac{Mass of substance in grams}{Molecular mass of substance}\)

Molecular mass of Na₂SO₄.10H₂O is calculated to be

(23×2)+32+(16×4)+(10×18) = 46+32+64+180 = 322 g/mol

Thus, for 483g of Na₂SO₄.10H₂O, the number of moles would be

= \(\frac{322}{483}\) = 0.67 mol

For every 1 mole of Na₂SO₄.10H₂O, there are 2 moles of Na⁺ and 1 mole of SO₄²⁻.

Thus, 0.67 moles of Na₂SO₄.10H₂O will have 0.67×2= 1.34 moles of Na⁺ and 0.67 moles of SO₄²⁻.

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Therefore, the value of x at equilibrium is approximately 1.24.

Let us rewrite the expression K = c_a^2c_bC_c as a function of x.

K = ((c_a0 − 2x) / c_a0)^2((c_b0 − x) / c_b0)(c_c0 + x) / c_c0
K = 0.016
c_a0 = 42
c_b0 = 28
c_c0 = 4
We can solve for x using a graphical method. We can use a spreadsheet software program, such as Microsoft Excel, to plot the function K as a function of x.

The value of x for which the function K is equal to the constant value of 0.016 represents the value of x at equilibrium.

In this way, we can determine the value of x graphically.

A graph of the function K as a function of x is shown below.
graph

We can see that the function K is equal to the constant value of 0.016 at two points on the graph.

The value of x for which K is equal to 0.016 is approximately x = 1.24 and x = 2.22.

However, we can see from the graph that the value of x that represents equilibrium is approximately x = 1.24.

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Large-scale fertilisation of the ocean to stimulate blooms and draw down carbon have been proposed using iron. Iron fertilisation is a technique that involves adding iron to the ocean surface to encourage the growth of phytoplankton, which in turn consume carbon dioxide through photosynthesis, drawing down carbon from the atmosphere.

Large-scale fertilisation of the ocean to stimulate blooms and draw down carbon have been proposed using iron fertilisation. Iron fertilisation involves adding iron to the ocean, which acts as a nutrient for phytoplankton, stimulating their growth and leading to a bloom. As the phytoplankton grow, they draw down carbon dioxide from the atmosphere through photosynthesis, thus helping to reduce the amount of carbon in the atmosphere. However, there are concerns about the potential environmental impacts of large-scale iron fertilisation, and it is not yet clear if it is a viable solution for reducing atmospheric carbon levels.

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The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) is equal to the moles of solute per litre of solution.

In this instance, the volume of the solution is 1250 mL, and the molarity of KC1 is 0.75 M. The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) times the number of litres in the solution equals 0.75 M times (1250 mL/1000 mL/L) or 0.9375 moles of KC1.

Consequently, 0.9375 moles of KC1 are present in 1250 mL of 0.75 M KC1. It is significant to remember that a solution's molarity is a measurement of the amount of a solute present in a given volume of the solution.

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Answer:

The correct answer is 1.66 atm ≅ 1.7 atm

Explanation:

Given:

T₁ = -13°C + 273 = 260 K (initial temperature)

T₂ = 15°C + 273 = 288 K (final temperature)

P₁ = 1.5 atm

P₂= ?

We use the mathematical expression of Gay Lussac's Law to calculate P₂, as follows:

P₁/T₁ = P₂/T₂

P₂= P₁/T₁ x T₂ = (1.5 atm)/(260 K) x 288 K = 1.66 atm ≅ 1.7 atm

Since the law says that the temperature of a gas is directly proportional to the pressure, when the temperature is increased, the pressure increases.

We can get a better view of the animal using a hand lens.

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Answer:

Blank 1: Microscope

Blank 2: Cells

Answer: (answers are in bold)

Because of the invention of the microscope, we know that all organisms are made of small living creatures called cells.

Explanation:

Well the statement explains itself; I'll explain the invention of the microscope.

No one really knows who invented the simple microscope, but the compound microscope was invented c. 1590 by Dutch lens-maker Zacharias Janssen. He used it to magnify object to about 10x their original size. Anton von Leeuwenhoek made even better ones; those had up to 275x magnification.

Answer:

The ionic character of a compound can be used to determine the bond polarity, and the gas phase dipole moment can be used to calculate the bond length. The equation for the bond length (r) in terms of the bond polarity (p) and the bond dipole moment (μ) is given by:

r = (μ) / (4πpε_0p)

Where ε_0 is the vacuum permittivity and p is the bond polarity.

For AgCl, the bond polarity can be calculated from the ionic character:

p = 78.1%

So, substituting the values into the equation, we get:

r = (11.5 D) / (4π * 0.781 * 8.854 x 10^-12 C^2/Nm^2) = 2.8 x 10^-10 m

So the distance between the Ag and Cl atoms in gaseous AgCl is approximately 2.8 x 10^-10 meters.

Explanation:

Answer:

yes

Explanation:

This is because all living tissues

have magnetic properties that are affected to some extent by the existence of electromagnetic radiation in the environment.

The ability of an atom to attract shared electrons to itself is called (i) electronegativity. It is generally measured on the (ii) Pauling scale. An arbitrary value of (iii) 4.0 is assigned to fluorine (have greatest ability to attract electrons). It generally (iv) increases across a period and (v) decreases down a group.

Electronegativity is the property of an atom in a molecule to draw shared electrons. The type of bond that will be created when two atoms unite depends on the difference in their electronegativities. The link will be covalent if there is little variation in the two atoms' electronegativities since neither atom can totally take the other atom's shared electrons.

The greater the electronegativity, which is a number without units, the more electrons an atom attracts. It, therefore, increases along a period- going from left to right and decreases down a group in the periodic table.

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Correct question is:

Fill in the blanks with the appropriate option. The ability of an atom to attract shared electrons to itself is called (i). It is generally measured on the (ii) scale. An arbitrary value of (iii) is assigned to fluorine (have greatest ability to attract electrons). It generally (iv) across a period and (v) down a group.

A. (i)polarity , (ii)Pauling , (iii)2.0 , (iv)decreases , (v)increases

B. (i)electronegativity , (ii)Pauling , (iii) 4.0, (iv) increases, (v)decreases

C. (i)valency , (ii)Mulliken , (iii)1.0 , (iv) decreases, (v)increases

D. (i)electron affinity , (ii)Mulliken , (iii)2.0 , (iv)increases , (v)increases

After 72 days, a 1050 mg sample of Iodine-131 would have decayed to approximately 46.87 mg.

A half-life is the time it takes for half of a sample of a radioactive isotope to decay. It is a characteristic property of each isotope and can be used to predict how long it will take for a given sample to decay to a certain amount. The amount of an isotope remaining after a certain amount of time can be calculated using the half-life and the formula N = N0 * (1/2)^(t/T).

Iodine-131 is used in medical treatments because it emits beta particles that can destroy cancerous cells. Its short half-life is an advantage because it allows for a higher dose of radiation to be delivered to the tumor while minimizing the amount of radiation exposure to healthy tissues. After a few weeks, the Iodine-131 decays to a negligible amount and the patient is no longer radioactive.

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Answer:

yes air pollution can affect a plants health

Explanation: