what is the name of an ion with a positive charge

Answer:

0.39L

Explanation:

Given parameters:

Initial volume of gas V₁ = 2.6L

Initial pressure on gas P₁ = 1.6atm

Final volume of gas V₂ = ?

Final pressure on gas P₂ = 10.6atm

Solution

Applying Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".

Mathematically;

                      P₁V₁ = P₂V₂

                      V₂ = [tex]\frac{P_{1}V_{1} }{P_{2} }[/tex]

                      V₂ =  [tex]\frac{1.6 x 2.6 }{10.6 }[/tex] = 0.39L

Answer:

Explanation:

Aqua regia is a strong and very concentrated acid formed by mixing Hydrochloric acid(HCl) and nitric acid.

The acid is very corrosive due to its formulation and it nearly reacts to dissolve all substances including the unreactive gold metal. It is formed by mixing the two acids in a proportion of 1:3, i.e HCl in 3 parts and nitric acid in 1 part.

The mixture dissolves a wide range of metals

Answer: a

Explanation:

scientific notation is about how many places passed the decimial place you are moving. therefor in order to get  1,550,000,000 you would move the decimial from 1.55 over nine times to the right

Answer: a.1.55x 109

Explanation:

In the study of Physics and Mathematics, sometimes we see very large or very small numbers. In both cases, the number of digits to write is very large. There is a simple and practical way of writing such numbers without having to write many zeros, this method is known as scientific notation. In the case we use a power of 10:

1,550,000,000 = 1.55x109

Answer:

8.41

Explanation:

ap#3

Answer:Iodine in hexane

Explanation:

An electrolyte is a solution that decomposes upon passage of direct current. An electrolyte must contain ions that dissociate under the influence of external direct current. Solution of ionic substances in polar solvents produce good electrolytes such as a solution of NaCl in water. However, a solution of a nonpolar substance such as iodine in a nonpolar solvent such as hexane is not an not electrolyte. Such solutions contain no ions and do not interact with direct current.

Nonelectrolytes are substances that don't ionize in water and don't conduct electricity. An example is Iodine in hexane because when it is dissolved, it does not produce ions contrary to other given examples which are electrolytes.

Nonelectrolytes are substances that don't ionize in water and therefore don't conduct electricity. An example of a nonelectrolyte solution would be Iodine in hexane (D). This is because when iodine is dissolved in hexane, it doesn't produce ions. Other examples given, Sodium nitrate in water (A), Hydrogen chloride in water (B), and Acetic acid in water (C) are all examples of electrolytes because they produce ions when dissolved in water.

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Answer:

The answer is A: Earth casts a shadow on the moon.

Explanation:

A lunar eclipse occurs when the earth passes between the sun and the moon, and the three of them are aligned. As the light of the moon that we see from the earth is actually the reflection of the sun's rays on it, when the earth is between the moon and the sun, it doesn't let the sun's rays to reach the moon, so what we see is the shadow of the earth over the moon.

No precipitate will form in the reaction between NaNO3(aq) and Li2SO4(aq). Both the products, sodium sulfate and lithium nitrate, are soluble in water as per most solubility rules.

In the reaction between NaNO3(aq) and Li2SO4(aq), no precipitate will form. This is because both sodium sulfate (Na2SO4) and lithium nitrate (LiNO3), the products of this reaction, are soluble in water. According to solubility rules, most nitrates (NO3-) and sulfates (SO4 2-) are soluble, meaning they dissolve in water, hence no precipitate will form.

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In the reaction between NaNO3 (aq) and Li2SO4 (aq), no precipitate will form.

In the reaction between NaNO3(aq) and Li2SO4(aq), a precipitate will not form. This is because both NaNO3 and Li2SO4 are soluble in water and will dissociate into ions when mixed. This means that no insoluble products are formed and there will be no precipitate.

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Answer:

Two or more compounds are called structural isomers if they possess the same molecular formula but different structural formulas.  

Explanation:

Two compounds are considered structural isomers if their molecular formulas are the same while they differ in their structural formulas.

For example, the molecular formula [tex]\mathrm{C_4H_{10}}[/tex] represents both butane and methylpropane. However, the two compounds differ in their structural formula. (See the structural formulas in the diagram attached.)

Due to the difference in the structures of structural isomers, there's a good chance that they will show different chemical and physical properties. For example, the melting point of butane is higher than that of methylpropane. The straight-chain shape of butane allows its molecules to be stacked close to each other. That allows for greater intermolecular forces and, therefore, a higher melting point.

The graph shows that pressure and volume have an inverse nonlinear relationship.

So, option D is correct one

The ideal gas equation is written as,

[tex]PV = nRT[/tex]

At constant temperature T and the number of moles of gas n, Pressure P is inversely proportional to the volume V.

P ∝ 1/V

Hence, graph should be inverse nonlinear and such type of graph is called rectangular hyberbola.

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Answer:

a

Explanation:

Answer:

As frequency increases, energy increases

Explanation:

The energy of electromagnetic waves increases as frequency increases. It is the wavelength that decreases when the energy of electromagnetic waves increases.

We can say a direct relationship exists between frequency and energy of electromagnetic waves.

The high energy waves in an electromagnetic spectrum are x-rays, ultraviolet rays etc. These waves also have a high frequency.

Frequency is the number of waves that passes a particular point per seconds. The more the frequency or the number of waves passing through, the more energy it is able to produce and release.

You use the information given by the question about latent heat of fusion of ice and construct the following reasoning:

if you need              3.36 × 10⁵ J to melt 1 kg of ice

then you need                      X  J to melt 13 kg of ice

X = (13 × 3.36 × 10⁵)/1 = 43.68  × 10⁵ J = 4.368  × 10⁶ J ≈ 4.37 × 10⁶ J

Answer : The amount of heat required is, (C) [tex]4.37\times 10^6J[/tex]

Explanation :

Formula used :

[tex]q=L\times m[/tex]

where,

q = heat required = ?

L = specific latent heat of fusion of ice = [tex]3.36\times 10^5J/kg[/tex]

m = mass of ice = 13.00 kg

Now put all the given values in the above formula, we get:

[tex]q=(3.36\times 10^5J/kg)\times (13.00kg)[/tex]

[tex]q=4.37\times 10^6J[/tex]

Therefore, the amount of heat required is, [tex]4.37\times 10^6J[/tex]

Since fire was discovered have people studied chemistry

Chemistry is a science that is dedicated to the study of the following topics:

It is one of the oldest sciences in the world because it is considered that it began with the first individuals who manipulated and discovered fire.

Over time it has evolved and many scientists have found different important knowledge such as the states of matter, the chemical elements of the earth, radioactivity, chemical reactions between elements and other knowledge.

According to the above, the correct answer is C. because it mentions the event considered as the beginning of the study of chemistry.

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Answer:

since was fire was discovered

Explanation:

Answer:

Carbon dioxide, water, and heat.

Explanation:

Hydrocarbon combustion refers to the type of reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat. Hydrocarbons are molecules consisting of both hydrogen and carbon. They are most famous for being the primary constituent of fossil fuels, namely natural gas, petroleum, and coal.

Answer:

carbon dioxide, water vapor, and heat

Answer:

Explanation:

You don't normally do this, but you might start by balancing the complex ion which is NO3^-

There are 2 of these on the right side of the arrow so make two on the left.

CaO + 2HNO3 arrow Ca(NO3)2 + H2O

That looks balanced. Let's check it out.

Species             Ca             H              NO3            O

Left                     1                2               2                 1     on the CaO

Right                   1                2               2                 1    on the H2O

Answer:

CaO + 2HNO3 ——-> Ca(NO3)2 +H2O

Explanation:

Answer:

It conducts electricity when it is dissolved in water.

Explanation:

It conducts electricity when it is dissolved in water is a property of a substance that is composed of atoms that are held together by ionic bonds.

The property of a substance that is composed of atoms that are held together by ionic bonds. As soon as it is dissolved in water, it conducts electricity.

Ionic bonds are defined as the type of chemical compound connection created by the electrostatic attraction of ions with opposing charges. Ionic bonds are important because they enable the production of particular organic molecules, ionic bonds are significant.

A material's electrical conductivity, or capacity to carry a current, is a measure of how much electrical current it can carry. While electrical conductance is a characteristic of a specific electrical component, electrical conductivity is a quality of the substance itself. How much voltage is needed to for a certain quantity of electric current to flow can be used to determine electrical conductivity.

Thus the property of a substance that is composed of atoms that are held together by ionic bonds. As soon as it is dissolved in water, it conducts electricity.

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These are 6 questions and 6 answers, each with its explanation.

Answer:

Explanation:

a. 0.7540

When there are not digits (non-zero digits) before the decimal point, the significant digits are all the decimal digits from the first non-zero decimal. So, in this case, they are all the shown digits: 7, 5, 4, and 0, i.e. 4 significant figures.

b) 12500

When there is not decimal point, the significant digits include all the digits before only zeros appear. So, they are 1, 2, and 5, i.e. 3 significant figures.

When it is meant that all the digits are significan, a perod must be added, in this way: 12500. The last point is part of the number, it does not add value, but indicates that all the digits are significant.

c) 10000.01

This is the only number from the list with both decimal and non-decimal digits.

When there are digits before and after the decimal point, the significant digits include all the digits before the decimal point and all the decimal digits. So they are 1, 0, 0, 0, 0, 0, and 1, i.e. 7 significant digits.

d) 1200

Again, when there is not decimal point, the significant digits include all the digits before only zeros appear. So, they are 1 and 2, i.e. 2 significant figures.

The two last zeros do not count as significant digits. If the number were written 1200., i.e. showing a decimal point but without digits after the decimal point, then all the four digits were singnificant.

e) 1.04 × 10⁴

This number is written in scientific notation.

The numbers before the power of 10 are called mantissa.

For a number written in scientific notation, the significant digits are the digits in the mantissa, i.e. 1.04. So, the number of significant digits is 3 (1, 0, and 4).

f) 0.0080050

For a number with only decimal digits (there are not digits with value before the decimal point), the zeros after the decimal point and before the first non-zero digit do not count as significant figures. So, the significant figures are: 8, 0, 0, 5, and 0, i.e. 5 significant figures.

Answer:

they are single cells that lack a nucleus and tend to live in extreme conditions.- B.

Answer:

Option (B).

Explanation:

Archaebacteria includes all the single celled prokaryotic organisms that are found in different shapes and size. These bacteria are more closely related to eukaryotes.

Archaebacteria can live in extreme conditions like hot hydrothermal vents, under highly acidic and alkaline conditions. Archaebacteria does not have any nucleus and membrane bound organelles.

Thus, the correct answer is option (B).

Answer:

0.114 moles

Explanation:

Calculate available moles of Fe:

0.171 mol Fe₂O₃ × (2 mol Fe / mol Fe₂O₃) = 0.342 mol Fe

Now calculate moles of Fe₃O₄ needed:

0.342 mol Fe × (1 mol Fe₃O₄ / 3 mol Fe) = 0.114 mol Fe₃O₄

Answer:

Explanation:

1) Balanced chemical equation:

2) Mole ratios:

3) Proportion:

4) Solve for x:

Answer: 20 moles of O₂ are consumed when 20 moles pf SO₂ are produced.

Answer:

Explanation:

25

Answer:

16.8 cups

Explanation:

We are given that there are 4.2 cups in in 1 liter of a liquid and we are to find out the number of cups that there will be in 4 liters.

To find this out, we will use the ratio method.

We know that:

1 L = 4.2 cups

So we can write it as:

[tex]\frac{1L}{4 L} =\frac{4.2 cups}{x}[/tex]

[tex] x = 4 .2 \times 4[/tex]

[tex] x = 1 6 . 8 [/tex]

Therefore, there are 16.8 cups in 4 liters.

16.8 cups are in 4 liters. A conversion factor is a ratio that allows you to convert a quantity expressed in one unit to an equivalent quantity expressed in another unit.

It is used in various fields, such as physics, chemistry, engineering, and everyday measurements. Conversion factors are derived from the relationships between different units of measurement.

1 liter is equivalent to 4.2 cups. This conversion factor tells that for every 1 liter, we have 4.2 cups.

To find out how many cups are in 4 liters, multiply 4 liters by the conversion factor of 4.2 cups per liter:

4 liters x 4.2 cups/liter = 16.8 cups

So, 4 liters would have 16.8 cups. This means that if  4 liters of liquid are into cups, need 16.8 cups to hold it all.

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Answer: D

Explanation:

Just took the test

Final answer:

Niels Bohr's contribution to atomic theory was his proposal of the Bohr's Model, which introduced the concept of electron orbits and explained the atomic spectrum of hydrogen.

Explanation:

Niels Bohr made significant contributions to atomic theory by proposing a model of the atom in 1913 called the Bohr's Model. This model incorporated Rutherford's planetary model and explained the atomic spectrum of hydrogen. Bohr's model was based on the concept that electrons move around the nucleus in circular orbits at certain allowed radii, and it introduced quantum mechanics principles. However, it is important to note that Bohr's model has been superseded by more accurate and complex models in modern atomic theory.

Answer:

Explanation:

The heat energy required to heat a substance may be calculated from the formula:

Where:

Then, substitute the numbers in the formula to get:

Answer:

Carbon dioxide and water i believe. Possibly carbon monoxide.

Explanation:

The two products in the combustion reaction of hydrocarbon or fuel are carbon dioxide and water.

Combustion reactions involve the oxidation of the hydrocarbon such reactions commonly liberate large amounts of energy with carbon dioxide and water as products.

A hydrocarbon undergoes combustion to form carbon dioxide and small amounts of water but no side products are left behind in the combustion reaction.

Combustion reactions are exothermic redox reactions and usually oxidized fuel. This is often referred to as smoke. The combustion reactions are accompanied by flames but not all combustion reactions result in fires.

The combustion reactions of methane are also known to yield water and carbon dioxide. This chemical reaction can be represented by the chemical equation as follows:

CH₄  +  2O₂   →   2 H₂O + CO₂

The explosion of fireworks is also a combustion reaction as well as a redox reaction, specific ions are present in the fuel to emit a color to the flame.

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Answer:

The correct answer would be Food.

Answer:

6.022 x 10^23

Explanation:

There are 6.022 x 10^23 electrons that may bank in 1.6 g of methane.

10×6.023×10²²

6.023 ×10²³

Answer:

6.02 × 10^23

Explanation:

Number of moles of methane = 1.6/16 = 0.1

In one mole there are 6.02 × 10^23 atoms

Thus, in 0.1 mole there are 0.1 ×6.02 × 10^23 atoms =6.02 × 10^22 atoms

Hence total number of electrons = number of electrons present in CH4 × atoms present in 0.1 mole.

=10×6.02 × 10^22 =6.02 × 10^23

Answer:

It determines how the molecule functions.- B.

The shape of a molecule affect the molecule involved in living systems by determining its molecular fractions. The correct answer is B. It determines how the molecule functions.

The shape of a molecule plays a crucial role in how it interacts with other molecules and biological systems. The three-dimensional structure of a molecule determines its chemical properties and how it interacts with receptors, enzymes, proteins, and other molecules within living systems. Here are a few ways in which the shape of a molecule affects its involvement with living systems:

Binding and recognition: The shape of a molecule is important for specific molecular recognition and binding interactions. For example, enzymes bind to specific substrates through complementary shapes, allowing them to catalyze chemical reactions. Similarly, receptors in cells recognize and bind to specific molecules, such as hormones or neurotransmitters, based on their shape.

Biological activity: The shape of a molecule can determine its biological activity. Small changes in the molecular structure, even in the form of stereochemistry or chirality (mirror image isomers), can significantly alter a molecule's biological activity. Enantiomers, which have identical chemical formulas but differ in their three-dimensional arrangement, can have different biological effects due to their distinct interactions with biological systems.

Pharmacokinetics: The shape of a molecule affects its absorption, distribution, metabolism, and excretion within an organism. The size and shape of a drug molecule, for instance, can determine its ability to cross biological barriers, interact with target molecules, and be metabolized or eliminated from the body.

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Answer:

[H⁺] = 3.02 x 10⁻¹⁰M

Explanation:

Given parameters:

pH of the solution = 9.52

Unknown:

Concentration of the solution

Solution

There is a relationship between the pH and concentration of a solution.

                     pH = -log₁₀[H⁺]

The unknown here is [H⁺],

Now making it the subject of the formula

           [H⁺] = Inverse log₁₀(-pH)

           [H⁺] = Inverse log₁₀(-9.52)

              [H⁺] = 3.02 x 10⁻¹⁰M

Answer:

Here's what I get  

Explanation:

The etching gel used in many dental procedures contains  

Answer: fruit salad

Explanation: it consists of different types of materials.

Among the following options, heterogeneous mixture is a fruit salad. The correct answer is D.

A heterogeneous mixture is a type of mixture in which the components are not uniformly distributed and can be visibly distinguished. In other words, the different substances or phases that make up the mixture are not evenly mixed at a microscopic level.

In a fruit salad, different fruits are mixed together, and their distinct components can be observed separately. The different fruits retain their individual characteristics and do not dissolve or blend completely with each other.

On the other hand, options A, B, and C are examples of homogeneous mixtures. In a homogeneous mixture, the composition is the same throughout the mixture, and there are no visible boundaries or phases.

Therefore, the correct choice for a heterogeneous mixture is option D) A fruit salad.

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