Guys pleasee helpp 20 points

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 500 g

volume = 67 mL

We have

\(density = \frac{500}{67} \\ = 7.462686\)

We have the final answer as

Hope this helps you

Answer:

one atom of carbon and two atoms of oxygen

Explanation:

in CO2 the 2 is subscript next to the O which stands for oxygen, therefore, there is only one atom of carbon and two atoms of oxygen

15mg of atropine sulfate is needed to make 30ml of a 1:200 solution

To find the mass of atropine sulfate, first, the ratio should be converted into a percentage. The given ratio is 1:200

Percentage mass = (1/200) x 100

                            = 1/2%

Percentage mass = 0.5%

Let us consider the mass of atropine sulfate required to be x

Therefore,

0.5/100 ml = x / 30ml

x = (0.5/100)30

x = 0.15g

On converting 0.15g to milligrams we get,

x = 0.15 x 1000

x = 150mg

Therefore, the required mass of atropine sulfate to make 30 ml of a 1:200 solution is 150mg.

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Given :

Half-life of Iodine , \(t_{0.5}=8 \ days\) .

Initial concentration , \([A_o]=100\ mg\) .

To Find :

The amount of sample remains after 32 days .

Solution :

Rate constant is given by :

\(k=\dfrac{0.693}{t_{0.5}}\\\\k=\dfrac{0.693}{8}\ s^{-1}\\\\k=0.086625\ s^{-1}\)

Now , by rate law :

\([A]=[A_o]e^{-kt}\)

Putting all given values, we get :

\([A]=100\times e^{-(0.086625)\times 32}\\\)

\([A]=6.25\ mg\)

Therefore , the remaining sample after 32 days is 6.25 mg .

Hence , this is the required solution .

Answer:

c

Explanation:

Answer:they were poisoned with powdered caffeine (C)

Explanation:

I just took the test! And got all the points for this question :) hoped I could help

A chemical reaction's mass of reaction may be thought of as a measurement of the masses (or weights) of the components involved in the reaction.

Chemical reactions nearly usually take place in an excess of one or more reactants, and as a result, a reaction may continue only to a point when the "limiting reactant" is completely transformed to the reaction product (s).

The following steps are necessary to calculate the mass of product formed, in order:

Step 1:

Write the balanced chemical equation

Step 2:

Determine the mole ratios

Step 3:

Convert moles of known to moles of unknown using mole ratios

Step 4:

Convert moles of unknown to mass of unknown using molar mass

Step 5:

Round to the appropriate number of significant figures.

Step 6:

State the answer with the proper unit.

Let's say that the balanced chemical reaction is:

A + B → C + D

Where A and B are the reactants, and C and D are the products.

If the mass of A is 50 g and the mass of B is 30 g, we can calculate the mass of C formed by following the steps above.

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Answer: C

Explanation:

The subscript for Iridium in the correct formula for Iridium (I) Chromate is 2. In the compound Iridium (I) Chromate, the Iridium ion has a charge of +1. This means that there needs to be two Iridium ions to balance out the charge of the Chromate ion, which has a charge of -2.

In chemical formulas, the subscript is used to indicate the number of atoms or ions of a particular element in a compound. So in this case, the subscript of 2 for Iridium indicates that there are two Iridium ions present in Iridium (I) Chromate.

To further clarify, let's break down the components of Iridium (I) Chromate: "Iridium" refers to the element Iridium, which is represented by the symbol "Ir".  "(I)" indicates that the Iridium ion has a charge of +1.
"Chromate" refers to the polyatomic ion Chromate, which is represented by the formula "CrO4^2-". It has a charge of -2. By combining the Iridium ion and the Chromate ion, we need two Iridium ions to balance out the charge of the Chromate ion, resulting in the formula Ir2(CrO4).

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The dipole moment of gaseous AgCl is 11.5 D, and its ionic character is 78.1%. This means that 78.1% of the molecule’s bond is ionic and the remaining 21.9% is covalent.

A molecule’s bond is an attraction between atoms that allows the formation of chemical compounds. These bonds are formed when the electrons in the outermost shells of the atoms are shared or exchanged. There are two types of bonds, ionic and covalent. Ionic bonds form when the atoms of two different elements exchange electrons, while covalent bonds form when the atoms share electrons. This type of bonding is important in the structure of molecules, as it allows them to form stable compounds. Molecule bonds can be either single, double, or triple, depending on how many pairs of electrons are involved in the bond.

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Answer:

thermal energy

Explanation:

Maple has a sample of iodine gas. She has 3.20 x 1023 molecules of iodine gas, 5kg is the mass of this sample.

What is mass ?

The basic characteristics of matter include mass. A body's mass is an indicator of how much matter is present there.  A body's mass is constant throughout its whole life. The quantity of gravity pulling on a body is measured by its weight.

What is molecules?

A molecule is a collection of two or more atoms that together make up the smallest unit that may be used to identify a pure substance while still preserving its chemical makeup and physical qualities. There are three different kinds of molecules: atom-sized, element-sized, and compound-sized.

Therefore, maple has a sample of iodine gas. She has 3.20 x 1023 molecules of iodine gas, 5kg is the mass of this sample.

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hahah i also needed this answer for ms mackos packet

also can you make me brainliest so that i get more points

Answer:

Explanation:

the tendency for items have 2 electrons in their outermost shell by interacting with others items through electron sharing or transfer is known as duplet rule. if an atom has 2 electrons in it's outermost shell then it is called duplet rule and if a 8 electrons in it's outermost shell than it is called octet rule .

In a TLC experiment, the compound with the larger Rf value will elute faster. In the case of naphthalene and 1-bromonaphthalene, the 1-bromonaphthalene will elute faster and have a larger Rf value.

This is because 1-bromonaphthalene is more polar than naphthalene. Polar compounds have a stronger attraction to the polar stationary phase (such as the silica gel in TLC plates) and will interact more with it, resulting in a lower Rf value.

Naphthalene, on the other hand, is less polar and will have a weaker interaction with the stationary phase, allowing it to travel further and have a higher Rf value.

The polarity of a compound is determined by the presence of functional groups or atoms that create an uneven distribution of charge or electronegativity. In this case, the bromine atom in 1-bromonaphthalene increases its polarity compared to naphthalene, leading to a stronger interaction with the stationary phase.

In summary, the 1-bromonaphthalene will elute faster in a TLC experiment and have a larger Rf value compared to naphthalene due to its higher polarity resulting from the presence of a bromine atom.

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Mass of Oxygen : 47.9

Given

2S03 (g)⇒ 2S02 (g) + O2 (g)

240 g SO3

Required

mass of Oxygen

Solution

mol SO3 :

= 240 g : 80.1 g/mol

= 2.996

From the equation, mol O2 :

= 1/2 x mol SO3

= 1/2 x 2.996

= 1.498

mass O2 :

= 1.498 mol x 32 g/mol

= 47.9

Taking into account the reaction stoichiometry, given a 240.0 g sample of sulfur trioxide, 47.95 grams of oxygen are produced, assuming the decomposition goes to completion.

In first place, the balanced reaction is:

2 SO₃ → 2 SO₂ + O₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 160.2 grams of SO₃ form 32 grams of O₂, 240 grams of SO₃ form how much mass of O₂?

\(mass of O_{2} =\frac{240 grams of SO_{3}x 32 grams of O_{2} }{160.2grams of SO_{3}}\)

mass of O₂= 47.94 grams

Given a 240.0 g sample of sulfur trioxide, 47.95 grams of oxygen are produced, assuming the decomposition goes to completion.

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Benedict's test shows the presence of reducing sugars. This test is used to detect the presence of reducing sugars such as glucose, fructose, and maltose.

Reducing sugars are those that have a free aldehyde or ketone group and can reduce other compounds. Benedict's reagent, which contains copper sulfate, sodium carbonate, and sodium citrate, is added to the sample being tested. If reducing sugars are present, they react with the copper ions in the reagent to form a reddish precipitate of copper oxide.A positive Benedict's test appears as a reddish precipitate. This indicates the presence of reducing sugars in the sample being tested.

A negative Benedict's test appears as a blue solution. This indicates the absence of reducing sugars in the sample being tested.1. Benedict's test shows the presence of reducing sugars.2. A positive Benedict's test appears as a reddish precipitate.3. A negative Benedict's test appears as a blue solution. Benedict's test is a biochemical test used to detect the presence of reducing sugars in a solution. In a positive Benedict's test, the reaction between the reducing sugar and the copper sulfate in Benedict's reagent forms a reddish precipitate. On the other hand, a negative Benedict's test indicates that there are no reducing sugars present, and the solution remains blue, which is the color of the original reagent.

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The electronic configuration of the Ru2+ cation would not change in this environment, as it is determined by the number of protons and electrons in the ion itself.

In order to determine the expected electronic configuration for a ruthenium cation in a ceramic (ionic) solid, we need to know the oxidation state of ruthenium.

Ruthenium (Ru) is a transition metal that can exhibit a range of oxidation states, but its most stable oxidation state is +2. In this state, it loses two electrons to form a cation with a charge of +2.

In an ionic solid, the ruthenium cation would be surrounded by negatively charged ions, such as oxygen (O2-) or fluorine (F-), which would be attracted to the positively charged cation.

To determine the electronic configuration of the ruthenium cation, we can use the aufbau principle to fill the orbitals in order of increasing energy.

The electronic configuration of Ru in its ground state is [Kr]4d^7 5s^1.

When ruthenium loses two electrons to form the Ru2+ cation, the two electrons will be lost from the 5s orbital, leaving an electronic configuration of [Kr]4d^7.

In a ceramic (ionic) solid, the ruthenium cation would likely be surrounded by anions such as oxygen (O2-) or fluorine (F-), which would form a lattice structure with the ruthenium cations.

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An example of a secondary pollutant is option (c)- photochemical oxidants.

Secondary pollutants are formed when primary pollutants react with each other or with other substances in the atmosphere. Photochemical oxidants, such as ozone, are created through reactions involving sunlight and primary pollutants like VOCs (volatile organic compounds) and nitrogen oxides.

Hence, an example of a secondary pollutant is option (c)- photochemical oxidants.

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word equation: HCl + barium --> barium chloride + hydrogen

formula equation: 2HCl + Ba --> BaCl2 + H2

given: 1.25×10^23 molecules HCl

Find: g BaCl2

given#moleculesSubA × 1molSubA/6.022×10^23 moleculeSubA × #molSubB/#molSubA × g SubB/1molSubB

The mass of barium chloride produced is 21.6 grams.

It is an inorganic compound with the chemical formula BaCl₂.

The equation: HCl + barium --> barium chloride + hydrogen

The  chemical equation : 2HCl + Ba --> BaCl₂ + H₂

Given the  1.25×10²³ molecules HCl

First, we calculate the amount of HCL

Amount of moles of HCl=

(1.25×10²³ molecules × 1 mole)/ 6.023×10²³ atoms

=0.2075 moles.

Then the number of moles is multiplied by the molar mass of barium chloride

208.24 g/mol × 0.2075 = 21.6 grams.

Thus, the mass of barium chloride produced is 21.6 grams.

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In the United States, the primary responsibility for achieving compliance with the National Ambient Air Quality Standards (NAAQS) rests with the states and local governments.

In the United States, the Environmental Protection Agency (EPA) sets National Ambient Air Quality Standards (NAAQS) for various pollutants that are harmful to human health and the environment.

The standards are set at levels that are considered safe for the public to breathe. The states and local governments are responsible for implementing plans to achieve and maintain compliance with the NAAQS within their jurisdictions.

This means that each state is responsible for developing and implementing a State Implementation Plan (SIP) that outlines how it will achieve and maintain compliance with the NAAQS.

The SIP may include regulations, control measures, and other actions designed to reduce air pollution levels within the state.

Local governments may also implement additional measures to help achieve compliance within their communities.

The EPA plays a supporting role in this process by providing guidance, technical assistance, and oversight to ensure that the states and local governments are implementing effective strategies to achieve and maintain compliance with the NAAQS.

The EPA also has the authority to take enforcement action against states or local governments that fail to meet their obligations under the Clean Air Act, which includes implementing plans to achieve compliance with the NAAQS.

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Answer:

To calculate the number of molecules in 12.3 moles of SO3, we can use the Avogadro's number, which is the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 x 10^23 atoms or molecules per mole.

To calculate the number of molecules in 12.3 moles of SO3, we can multiply Avogadro's number by the number of moles of SO3:

Number of molecules = Avogadro's number x moles of SO3

Number of molecules = 6.022 x 10^23 x 12.3

Number of molecules = 7.34 x 10^24

So there are approximately 7.34 x 10^24 molecules in 12.3 moles of SO3.

In chemistry, a covalent bond is a chemical bond that involves the sharing of electrons between atoms. The pair of electrons involved in a covalent bond is called a bonding pair, whereas the electrons not involved in bonding are called an unshared pair or lone pair.

The bonding pair of electrons is located between the two atoms that are sharing it, and it is attracted to both nuclei. This attraction holds the atoms together in a covalent bond. The unshared pair of electrons is located on a single atom, and it is only attracted to the nucleus of that atom. This means that the unshared pair of electrons is not involved in bonding, and it can be used for other purposes, such as forming a new covalent bond or participating in a chemical reaction. The number of bonding pairs and unshared pairs of electrons that an atom has determines its chemical properties. For example, atoms with a single bonding pair and no unshared pairs are typically very reactive, while atoms with multiple bonding pairs and no unshared pairs are typically very stable.

Here are some examples of covalent bonds:

The bond between two hydrogen atoms in a hydrogen molecule (H2) is a covalent bond. Each hydrogen atom has one electron, and they share these electrons to form a covalent bond.

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Answer: During a chemical reaction, reactants are transformed into products through a process known as chemical transformation. This process involves the breaking of chemical bonds between atoms in the reactants and the formation of new bonds between atoms to form the products. The key to this transformation is the rearrangement of the electrons in the atoms involved.

In a chemical reaction, the atoms in the reactants are rearranged to form new chemical compounds, the products. This rearrangement is often accompanied by the release or absorption of energy, leading to the formation of new chemical bonds between atoms. The energy changes that occur during a chemical reaction are closely linked to the chemical changes, and are often responsible for driving the reaction forward.

A chemical reaction can occur through several different mechanisms, but all involve the breaking of existing bonds between atoms and the formation of new bonds to form the products.

Explanation:

When a negative ion enters the cell through an ion channel, it causes hyperpolarization, resulting in a more negative membrane potential. This makes it more difficult for the membrane potential to reach the threshold for an action potential.

When a negative ion enters the cell through an ion channel, it causes hyperpolarization of the membrane potential. Hyperpolarization is a change in the membrane potential where the inside of the cell becomes more negative than the resting membrane potential.

This occurs because the entry of negative ions, such as chloride (Cl⁻), increases the negative charge inside the cell, making it more difficult for the membrane potential to reach the threshold for an action potential.

On the other hand, the exit of a positive ion, such as sodium (Na⁺), results in depolarization. Depolarization is a change in the membrane potential where the inside of the cell becomes less negative or even positive compared to the resting membrane potential.

This occurs because the exit of positive ions reduces the positive charge inside the cell, making it easier for the membrane potential to reach the threshold for an action potential.

Therefore, the correct matching is the entry of a negative ion, which leads to hyperpolarization of the membrane potential.

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Which ion channel action is correctly matched with its resulting change in membrane potential? exit of a positive ion: depolarization exit of a negative ion; hyperpolarization entry of a positive ion, hyperpolarization entry of a negative ion; hyperpolarization activation of sodium-potassium transporters; depolarization

The new volume of the gas is 2.38 L when the temperature is raised to 80°C and the pressure is increased to 245 kPa.

Given:

P1 = 110 kPa

V1 = 4.00 L

T1 = 30°C = 30 + 273.15 K = 303.15 K

P2 = 245 kPa

T2 = 80°C = 80 + 273.15 K = 353.15 K

Use the combined gas lawc, which states:

(P1V1) / (T1) = (P2V2) / (T2)

Where:

P1 and P2 are the initial and final pressures, respectively.

V1 and V2 are the initial and final volumes, respectively.

T1 and T2 are the initial and final temperatures, respectively.

Substitute these values into the equation:

(110 kPa × 4.00 L) / (303.15 K) = (245 kPa × V2) / (353.15 K)

Now, let's solve for V2:

(110 kPa × 4.00 L × 353.15 K) = (245 kPa × V2 × 303.15 K)

(176860 kPaLK) = (74235 kPa × V2 × K)

Dividing both sides by 74235 kPa × K:

(176860 kPaLK) / (74235 kPa × K) = V2

V2 = 2.38 L

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The correct name for FeO is Iron (II) oxide. The compound N2O3 is called dinitrogen trioxide, not sodium tetroxide as there is no such thing as sodium tetroxide.

Sodium only forms compounds up to Na2O. Dinitrogen tetroxide is N2O4, not N2O3. The correct name for FeO is A: Iron (II) oxide. This is because Fe has a +2 oxidation state and O has a -2 oxidation state, forming a balanced compound. The compound N2O3 is named Dinitrogen trioxide, as it consists of two nitrogen atoms (di-) and three oxygen atoms (tri-) combined. The compound N2O3 is called dinitrogen trioxide, not sodium tetroxide as there is no such thing as sodium tetroxide.

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Answer:

Help your self

Explanation:

Explanation:

physical changes : boiling water, freezing water, a pencil being sharpened.

chemical change : rotting cheese, exploding dynamite.

Answer:

boiling water

a pencil being sharpened

freezing water

Explanation:

A change that does not lead to any difference in chemical composition of a substance is known as a physical change.

For example, shape, size, mass, volume, density, boiling point, etc of a substance are all physical properties.

On the other hand, changes that lead to bring change in chemical composition of a substance is known as a chemical change.

For example, exploding dynamite, rotting cheese etc are all chemical changes.

Chemical change is the change in which there is rearrangement of atoms and the new substances get formed.

Boiling water only changes the phase from liquid to gas and thus is a physical change.

Pencil on being sharpened only gets smaller in size and thus is a physical change.

exploding dynamite would result into formation of new substances and hence a chemical change.

Freezing water only changes the phase from liquid to solid and thus is a physical change.

Rotting cheese would result in formation of new substances and hence a chemical change.

Therefore, we can conclude that following are the physical changes in matter.

boiling water.

a pencil being sharpened.

freezing water.

Answer:

B)The first and second beakers contain a solution that completely dissociates the ions. These ions create an electrical current. The third beaker solution does not dissociate ions. It is a nonelectrolyte.

Explanation:

Electrolytes dissociate ions. They are also conductors. Since the first 2 bulbs light up strongly, we can assume that the ions completely dissociated. Since the 3rd did not light up, it is a nonelectrolyte.

Answer:

The first and second beakers contain a solution that completely dissociates the ions. These ions create an electrical current. The third beaker solution does not dissociate ions. It is a nonelectrolyte.

Explanation: