do you agree or not that evidence is only used to back scientific laws and provide evidence why or why not!!!!!! thank you, will mark brainliest to whoever does it correct the 1st time what i asked!!!!!!!!!!

The new pressure of the gas is 4.95 atm.

Boyles law states that the volume of a given mass of gas is inversely related to its pressure at constant temperature.

Given that;

V1 = 1.50 L

V2 = 0.50 L

P1 = 1.65 atm

Then;

P1V1 = P2V2

P2 =  1.65 atm *  1.50 L/ 0.50 L

P2 = 4.95 atm

The new pressure of the gas is found to be 4.95 atm.

Missing parts:

a balloon filled with a volume of 1.50 L is compressed to a volume of 0.50 L at a constant rate of temperature. if the initial pressure of the gas inside the balloon was 1.65 atm what is the new pressure?

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Answer:

The mass of a sample of iron that has had 300 J applied to it and heats up from 20 degrees Celsius to 40 degrees Celsius is 32.61 grams.

Explanation:

Calorimetry is the measurement and calculation of the measurement of heat changes exchanged by a body or a system produced in physical and chemical processes.

The sensible heat of a body is the amount of heat received or transferred by a body to produce a change in temperature but without a change in physical state.

The sensible heat in a constant pressure is calculated by:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c, and where ΔT is the temperature variation (ΔT=Tfinal - Tinitial)

In this case:

Replacing:

300 J= 0.46 \(\frac{J}{g*C}\) * m* (40 - 20) C

Solving:

300 J= 0.46 \(\frac{J}{g*C}\) * m* 20 C

\(m=\frac{300 J}{0.46 \frac{J}{g*C} * 20 C}\)

m= 32.61 g

First, we need to determine the number of moles of \(Na_{2} S_{2} O_{3}\) used in the reaction: The Correct option is C 5.35%.

0.100 mol/L x 0.01950 L = 0.00195 mol  \(Na_{2} S_{2} O_{3}\)

Since two moles of  \(Na_{2} S_{2} O_{3}\) react with one mole of NaOCl, we can determine the number of moles of NaOCl in the sample:

0.00195 mol \(Na_{2} S_{2} O_{3}\) x (1 mol NaOCl / 2 mol \(Na_{2} S_{2} O_{3}\) ) = 0.000975 mol NaOCl

Next, we can calculate the mass of NaOCl in the sample:

0.000975 mol NaOCl x 74.44 g/mol = 0.0724 g NaOCl

Last but not least, we may determine the mass percentage of NaOCl in the bleach sample:

(0.0724 g NaOCl / 1.356 g bleach sample) x 100% = 5.35%

Therefore, the answer is (C) 5.35%.

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After two or more atoms lose or receive electrons to create an ion, an ionic bond can occur. Ionic bonds form when metals lose electrons and nonmetals acquire electrons. Ions with opposing charges attract one other, forming an ionic connection.

Ionic bonding is the principal interaction in ionic compounds and includes the electrostatic attraction between oppositely charged ions or between two atoms with drastically differing electronegativities. Ionic bond, also known as electrovalent bond, is a kind of connection generated in a chemical molecule by the electrostatic attraction of oppositely charged ions. When the valence (outermost) electrons of one atom are permanently transferred to another, a bond is formed.

Here,

An ionic link can form when two or more atoms lose or gain electrons to form an ion. When metals lose electrons and nonmetals gain electrons, ionic bonds develop. Ions having opposing charges attract one another, resulting in the formation of an ionic bond.

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The formula 3Mg(O3H2)3 denotes a molecule made up of three magnesium atoms and nine groups of hydroxide ions (O3H2), each of which contains three oxygen atoms and six hydrogen atoms.

What exactly is a molecule?

A molecule is a collection of two or even more than two atoms that are held together by chemical-bonds. These atoms could be of the same element or of different elements. H2O (water), for example, is a molecule composed of two (2) hydrogen atoms and one oxygen atom.

CO2 (Carbon dioxide) is just another example of the molecule made up of 1-carbon atom and 2-oxygen atoms. Molecules are the basic building blocks of many substances, and their unique arrangement and properties play an important role in a wide range of chemical reactions and biological processes.

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When reading the label on a reagent container, the three most important pieces of information include:

This is referred to a chemical which is added to a mixture thereby resulting in a chemical reaction occurring and have different properties which is why the label has to contain their features.

It is therefore best to check the label for properties such as name and concentration so as to enable individuals use it for the right type of reactions and is also important in prevention of the risk of accident by individuals.

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The pH of a solution if the pOH is 2.96 will be 11.04. As the sum of the pH and pOH is always 14.

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Answer: Zn2+ !!!!!

Explanation: I got Fe3+ wrong on the quiz!!!!!

Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

Answer:

on both sides, there are 4 hydrogen atoms.

There are 4 atoms of hydrogen (H) present on both sides of the equation. The correct option is C.

Chemical equations are symbolic depictions of chemical reactions, where the reactants and products are stated in terms of their respective chemical formulae.

In a chemical equation, the reactant entities are supplied on the left side of the equation, and the product entities are given on the right side. This is a symbolic representation of a chemical reaction.

The reaction is given below:

2H₂S + 3O₂ → 2H₂O + 2SO₂

The reactant and the product side have the same number of atoms. Now, in hydrogen, we can see that:

2 x 2 = 4 atoms.

Therefore, the correct option is C. 4 atoms are there in hydrogen in the reaction.

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Answer:

A. Able to be lost or gained in chemical reactions.

Explanation:

Only electrons are lost or gained.

Able to be lost or gained in chemical reactions. Hence, option A is correct.

An atom contains a central nucleus surrounded by one or more electrons.

A chemical reaction is not created or destroyed, it simply moves electrons from one atom to another, and does not change the nucleus of the atoms. The total mass of the matter remains conserved in any chemical change.

Hence, option A is correct.

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The Solubility of a substance is defined as the maximum amount that dissolves in a given amount of solvent at a specified temperature.

Solubility is the most awareness of a solute that can dissolve in a solvent at a given temperature. at the maximum concentration of solute, the solution is said to be saturated.

The most amount of a substance that can be dissolved in a given volume of solvent is referred to as solubility. frequently, the solubility in water is expressed in gram/a hundred mL. an answer that has now not reached its most solubility is called an unsaturated solution.

Solubility is described because the maximum amount of a substance that it will dissolve in a given amount of solvent at a distinct temperature. Solubility is a characteristic property of a particular solute-solvent aggregate, and unique materials have significantly differing solubilities.

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Answer:

10.1g of H₂ are produced

Explanation:

To solve this question we need, first, to convert the mass of each reactant to moles and, using the chemical reaction, find limiting reactant. With limiting reactant we can find the moles of H2 and its mass:

Moles Zn -Molar mass: 65.38g/mol-:

307g * (1mol / 65.38g) = 4.696 moles

Moles HCl -Molar mass: 36.46g/mol-:

381g HCl * (1mol / 36.46g) = 10.45 moles

For a complete reaction of 10.45 moles of HCl are required:

10.45 moles HCl * (1mol Zn / 2mol HCl) = 5.22 moles Zn

As there are 4.696 moles of Zn, Zn is the limiting reactant

The moles of H₂ produced = Moles of Zn added = 4.696 moles. The mass is-Molar mass H₂ = 2.16g/mol-:

4.696 moles * (2.16g / mol) =

Answer:

The right alternative is Option D (0.78 V).

Explanation:

According to the question,

The cell potential will be:

= \(E^0_{Cr_2 O_7/er^{3+}}- E^0_{Fe^{2+}/Fe}\)

By putting the values, we get

= \(1.23-0.45\)

= \(0.78 \ V\)

Thus the above is the correct option.

Answer:

Physical Change

Explanation:

To determine the volume of N_{2} gas produced when 42.7 g of CO is reacted completely at STP (Standard Temperature and Pressure), we need to use the concept of molar ratios and the ideal gas law. By calculating the number of moles of CO and using the balanced equation, we can find the number of moles of \(N_{2}\). Then, using the ideal gas law, we can convert the moles of N_{2} to volume at STP.

First, we need to determine the number of moles of CO using its molar mass. The molar mass of CO is approximately 28.01 g/mol. By dividing the given mass (42.7 g) by the molar mass, we can calculate the number of moles of CO. Next, using the balanced equation, we see that the stoichiometric ratio between CO and N2 is 2:1. This means that for every 2 moles of CO, 1 mole of N_{2}is produced. By applying the stoichiometric ratio, we can determine the number of moles of N_{2}produced.

Finally, to find the volume of N2 gas at STP, we can use the ideal gas law. At STP, the pressure is 1 atmosphere (atm) and the temperature is 273.15 K. The ideal gas law equation, PV = nRT, can be rearranged to V = (nRT)/P, where V is the volume, n is the number of moles, R is the ideal gas constant, T is the temperature in Kelvin, and P is the pressure. By substituting the calculated number of moles of N_{2}, the ideal gas constant, the temperature at STP, and the pressure at STP into the ideal gas law equation, we can determine the volume of N_{2} gas produced.

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Answer:

The answer is synthesis reaction

Explanation:

Also known as a composition reaction, a synthesis reaction is a reaction in which two or more substances combine to form a new compound.

I copied and pasted the explanation part. But I hope the information is still helpful :)

Besides nylon, HCl is formed from the reaction of adipoyl chloride and 1,6- diaminohexane , but HCl is the byproduct molecule.

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Answer:D

D

DDD

DDDDDDDDDD

Explanation:

Answer:

C. 1 and 3 only

Explanation:

In this element representation';

The superscript (23) s the mass number. Mass Number = Protons + Neutrons

-The subscript (11) is the atomic number.

Atomic Number = Protons

This means;

Number of Protons = 11

Number of Neutrons = 23 - 11 = 12

Number of electrons = 11 (Since it is a neutral atom)

Also sodium belongs to group 1 hence number of outer electrons = 1

The correct option is;

C. 1 and 3 only

i think the answer is A and D

The biodiversity of the reef depends upon the location and corals die in the muddy water.

Coral reef:

These are the ecosystem of sallow water in the oceans. They made by reef building corals. It is one of the most diverse ecosystem.

Therefore, the biodiversity of the reef depends upon the location and corals die in the muddy water.

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Answer:

All elements, and compounds, all matter in point of fact, are composed of atoms. In a compound, there are 2 or more different types of atoms present that are chemically bound. In an element, there is only the one type of atom.

Explanation:

Answer:

fossilization

Explanation:

hope it helps

Work done by atm =-1.13L for a rope can be held by hand or with external pressure, which is one method of holding the free end. The way that wire rope clips and swaged sleeves (which create an eye) function.

They exert enough external pressure to provide enough friction to stop the clamped end from sliding down the rope's length. temperature one litre to two litres, one mole of a monoatomic ideal gas expands adiabatically at initial temperature T against a constant external pressure of 1 atm. Determine the final temperature. [R=0.0821 lt. atm. K mole 1]

accomplished work

-PAV =  2-0 0.750 (2.50-1.00 2 - 0.750) (1.50) (1.50) - 1.125 L\s

Work done by atm =-1.13

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Answer:

The answer to your question is D. During anaerobic respiration, the formation of lactic acid results in the release of two ATP molecules. This is in contrast to aerobic respiration, which produces 38 ATP molecules.

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The oxidation number of M in M₂ᵃ(SO₄)₃ᵇ was calculated to be +3.

For finding the oxidation number, firstly identify the charge on the whole molecule. In this case it is zero.

From the oxidation number of the whole molecule, the oxidation number of each ion can be found.

SO₄²⁻ has an oxidation number of -2. Assume the oxidation number of M to be x. Thus,

oxidation number of M + oxidation number of SO₄²⁻ = 0

2x + 3(-2) = 0

2x -6 = 0

2x = 6

x = +3

Thus, the oxidation number of M is calculated to be +3.

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Answer:

There are main six noble gases in the periodic table. The filling of 4f-orbitals occurs after 6s orbitals. The noble gas that belongs to the sixth period is Radon. Its electronic configuration is [ X e ] 6 s 2 4 f 14 5 d 10 6 p 6  .

Therefore, the name of noble gas is Radon.

Answer:

569K

Explanation:

Q = 3.5kJ = 3500J

mass = 28.2g

∅1 = 20°C = 20 + 273 = 293K

∅2 = x

c = 0.449

Q = mc∆∅

3500 = 28.2×0.449×∆∅

3500 = 12.6618×∆∅

∆∅ = 3500/12.6618

∆∅ = 276.4220

∅2 - ∅1 = 276.4220

∅2 = 276.4220 + ∅1

∅2 = 276.4220 + 293

∅2 = 569.4220K

∅2 = 569K

When the temperature is increased, there is the increase in thermal energy of the system. The final temperature of the iron in kelvins is 570 K.

The energy is the ability to do work.

Given is the energy Q = 3.5 kJ = 3500 J, mass of sample m = 28.2 g, specific heat of iron Cp = 0.449 J(g•K).

The initial temperature in kelvins is T1 = 20°C = 20 + 273 = 293K

The heat is related to the temperature difference as

Q = m c ∆T

Substitute the values into the expression,

3500 = 28.2 × 0.449 × ∆T

3500 = 12.6618 × (T2 -T1)

T2 - T1 = 276.4220

T2 = 276.4220 K +293 K

T2 = 569.4220K

The temperature of the iron is approximately 570 K.

Thus, the final temperature of the iron in kelvins is 570K.

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The substance changed into a new substance is the observation that scientist must list for a chemical reaction to happen.

A chemical reaction is a procedure that causes one group of chemical components to change chemically into another. Chemical reactions, which can frequently be described by a chemical equation, traditionally include changes that only affect the locations of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei (no change to the elements present). The study of chemical processes involving unstable and radioactive elements, where both electronic and nuclear changes may take place, is known as nuclear chemistry.

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Yes, there is a trick to memorizing pKa values.

pKa is the negative base-10 logarithm of the acid dissociation constant (Ka) of a solution. A lower pKa value means that the acid dissociates more readily in water to yield hydronium ions (H3O+), a general indication of acid strength.

A trick to memorizing pKa values

This trick to memorizing pKa values will require some effort but it is worth it.

Try to memorize the general patterns of the pKa values of different groups of organic compounds with similar functional groups. For instance, carboxylic acids have a pKa of about 5, which is relatively low. On the other hand, the pKa of alcohols is about 16-18, which is relatively high. When studying biochemistry, you will come across the Henderson-Hasselbalch equation often, which is a pH expression that is relevant to the titration of weak acids. In this equation, the logarithmic form of the acid dissociation constant (pKa) is frequently used. For example:

\($$pH = pK_a + log(\frac{[A^-]}{[HA]})$$\)

In summary, learning the pKa values of different groups of organic compounds with similar functional groups is a useful technique for memorizing them.

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