Question 4 4. Rubber, oxygen and paper are all made up of A. atoms B. chlorine C. carbon D. animal cells Question 5​

We can form more HI by increasing the temperature.

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, typically in the form of heat. This means that the energy of the reactants is lower than the energy of the products, and the reaction requires an input of energy to proceed.

In an endothermic reaction, the temperature of the surroundings usually decreases because energy is being taken in from the environment. For example, when ice melts, the process is endothermic because the ice absorbs heat from its surroundings, causing the temperature to drop.

Learn more about endothermic reaction:https://brainly.com/question/23184814

#SPJ1

Answer:Remove HI gas

Explanation:Acellus confirmed

Answer: Eggshells have a similar chemical composition to our tooth enamel, making them react similarly with other chemicals. This can help us understand what stains tooth enamel. When we brush an eggshell with fluoridated toothpaste, it strengthens the shell and protects it from acid, just like it does for our tooth enamel

Explanation:

Answer: Eggshells have a similar chemical composition to our tooth enamel, making them react similarly with other chemicals. This can help us understand what stains tooth enamel. When we brush an eggshell with fluoridated toothpaste, it strengthens the shell and protects it from acid, just like it does for our tooth enamel.

Answer:

The answer is d. induced dipole-induced dipole

Explanation:

I did the test.

Answer:

D: induced dipole-induced dipole

Explanation:

Answer:

6. physical

Explanation:

The elementary reactions in the given set are: \(2 NO(g) + 2 H_2(g)\) → \(N_2(g) + 2 H_2O(g)\), \(2 NO(g) + O_2(g)\) → \(2 NO_2(g), NO_2(g) + CO(g)\)→ \(CO_2(g) + NO(g)\).

Elementary reactions are individual reactions that cannot be further broken down into simpler steps. In the given set, the first reaction involving the combination of 2 NO molecules with\(2 H_2\) molecules to form \(N_2\) and \(2 H_2O\) satisfies the definition of an elementary reaction.

Similarly, the second reaction where 2 NO molecules react with \(O_2\) to produce 2 \(NO_2\) also qualifies as an elementary reaction. Finally, the third reaction where\(NO_2\) reacts with CO to yield \(CO_2\)and NO is another example of an elementary reaction. These reactions directly involve the reactant molecules without any intermediates or multiple steps.

Learn more about elementary reactions here:

https://brainly.com/question/30726416

#SPJ11

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 2500 × 5

We have the final answer as

Hope this helps you

Answer:

Mass number

Explanation:

Answer:

1. burial

2. Choice

3. pleasure

Explanation:

Mark brainliest! Please!

Answer:

0.008303 mol and 0.0997 g

Explanation:

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.022×10²³ atoms.

This implies that 1 mole of carbon also contains 6.022×10²³ atoms.

Next, we shall determine the mole of carbon that contains 5.0×10²¹ atoms. This can be obtained as follow:

1 mole of carbon contains 6.022×10²³ atoms.

Therefore, Xmol of carbon will contain 5.0×10²¹ atoms i.e

Xmol of carbon = 5.0×10²¹ / 6.022×10²³

Xmol of carbon = 0.008303 mole

Therefore, 0.008303 mole of carbon contains 5.0×10²¹ atoms.

Finally, we shall determine the mass of carbon. This can be obtained as follow:

Mole of carbon = 0.008303 mole

Molar mass of carbon = 12.01 g/mol

Mass of Carbon =.?

Mole = mass /Molar mass

0.008303 = mass of carbon/12.01

Cross multiply

Mass of Carbon = 0.008303 x 12.01

Mass of Carbon = 0.0997 g.

This solution has a pH of 7. As hydrogen and hydroxide ions are present in equal amounts in a pH 7 solution, it is neutral.

Atoms bearing an electric charge, such the hydrogen atom with charge H+, which has a value of 1, are known as ions. Even in pure water, ions frequently appear as a result of chance occurrences (producing some H+ and OH- ions).

We use the following formula to determine the pH of the solution:

pH = -log[H+]

where [H+] represents the number of hydrogen ions present in the solution.

Substituting the given concentration [H+] = 1.0 x 10⁻⁷ mol/L into the formula, we get:

pH = -log(1.0 x 10⁻⁷)

= 7

To know more about hydroxide ions visit:-

https://brainly.com/question/14619642

#SPJ1

Answer:

The answers are;

shaking the thermometer before use

making sure that the liquid inside the thermometer is at eye level when taking the temperature

making sure that the bulb of the thermometer does not touch the bottom the beaker or the ice when taking the temperature

Answer: C and D

Explanation:

Answer:

i think it's freezing of permafrost. so sorry if it's wrong lol

It is true that when 7.5 x 10-4 g of KOH is dissolved in 1.00 L of 1.0 x 10-8 M Cu(NO3)2, a precipitate of Cu(OH)2 is formed. This is determined through the concept of Balanced chemical reaction.

The balanced chemical reaction can be written as,

2KOH(aq.) + \(Cu(NO_{3} )_{2}\)(aq.) ==> \(Cu(OH){2}\)(s) + \(2KNO_{3}\)(aq.)

moles KOH present can be calculated as,

   = 7.5x10-4 g x 1 mole/56.1 g

   = 1.33x10-5 moles KOH

   = 1.3x10-5 M OH-

moles\(Cu(NO_{3} )_{2}\) present  can be calculated as,

          = 1.0x10-8 mole/L x 1 L

          = 1.0x10-8 moles Cu(NO3)2

          = 1x10-8 M Cu2+

\(Cu(OH){2}\) (s) ==> Cu2+(aq.) + 2OH-(aq.)

Q = [Cu2+][OH-]2

Q = (1x10-8)(1.3x10-5)2

Q = 1.3x10-18

To learn more about balanced chemical reaction

https://brainly.com/question/26694427

#SPJ4

The correct question is,

When 7.5 x 10-4 g of KOH is dissolved in 1.00 L of 1.0 x 10-8 M Cu(NO3)2, a precipitate of Cu(OH)2 is formed. True or False? (Ksp of Cu(OH)2 is 2.2 x 10-20).

The molecular mass of a 10g compound that has 30.066 × 10²³ atoms is 2.00g/mol.

The molecular mass of a substance can be calculated by dividing the mass of the substance by the number of moles.

molecular mass = mass ÷ no of moles

However, the number of moles of the substance must first be calculated by dividing the number of atoms by Avogadro's number.

no of moles = 30.066 × 10²³ ÷ 6.02 × 10²³

no of moles = 4.99moles

molecular mass = 10g ÷ 4.99 moles = 2.00 g/mol

Therefore, the molecular mass of a 10g compound that has 30.066 × 10²³ atoms is 2.00g/mol.

Learn more about molecular mass at: https://brainly.com/question/14122402

#SPJ1

The concentrations in mol/dm³ would be 0.002, 0.04, 0.007, and 0.01 respectively.

Since  1 dm³ of blood is taken as containing  1 dm³ of water, it means that the concentration levels are in mg/dm³.

Thus, we are tasked with the job of converting from mg/dm³ to mol/dm³.

Recall that: mole = mass in grams/molar mass in gram/mole

Molar mass of ethanol = 46.07 g/mol

80 mg of ethanol = 0.08 g = 0.08/46.07 = 0.002 mol

200 mg of ethanol = 0.2 g - 0.2/46.07 = 0.004 mol

300 mg = 0.3 g = 0.3/46.07 = 0.007 mol

500 mg = 0.5 g = 0.5/46.07 = 0.01 mol

Therefore, the respective concentrations in mol/dm³ would be 0.002, 0.04, 0.007, and 0.01 respectively.

More on concentrations can be found here: https://brainly.com/question/13872928

#SPJ1

Answer:

A

Explanation:

It's smaller hole

Answer:

I would say A.

Explanation:

There are approximately 6 moles in given set of atoms.

To find the number of moles in 3.612x10^24 atoms of Carbon, you will need to use Avogadro's number, which is 6.022x10^23 atoms/mol.

1. Determine the number of atoms given: 3.612x10^24 atoms of Carbon

2. Use Avogadro's number to convert atoms to moles:
(3.612x10^24 atoms) * (1 mol / 6.022x10^23 atoms)

3. Perform the calculation:
(3.612x10^24) / (6.022x10^23) = 6 moles (approximately)

So, there are approximately 6 moles in 3.612x10^24 atoms of Carbon.

To know more about Avogadro's number:

https://brainly.com/question/1513182

#SPJ11

Answer:

I think 20

Explanation:

Becu of science

A molecule or subunit that functions alone or combines with other similar molecules to form a polymer. All of the biomolecules that make up our cells are made up of strings of monomers. For example, proteins are made up of strings of amino acids and nucleic acids are strings of nucleotides.

Answer:

the porson above me is right

The type of reaction involved in stations 12, 13, and 14 varies. The initial appearance, type of change, observation, and clue of these experiments are noted.

Station #12:

Initial Appearance: The initial appearance of hydrogen peroxide (H₂O₂) is liquid and manganese (IV) oxide (MnO₂) is a blackish or brown solid.

Observations: During the experiment, hydrogen peroxide reacts with manganese (IV) oxide and decomposes to a "magical genie" that shows up as oxygen and water vapor.

Type of Change: It is a type of chemical change

Clue: formation of gas (bubbles form)

Station #13:

Initial Appearances: The solution looks colorless.

Observations: Iodate(V) ions, hydrogensulfate(IV) ions, mercury(II) ions, and starch are involved in this reaction, which results in a precipitate of mercury(II) iodide that turns orange after a short period of time. A little while later, the liquid abruptly becomes blue-black as the starch-iodine complex forms.

Type of Change: It is a type of chemical change where the color change from orange to black.

Clue: unexpected color change

Station #14:

Initial Appearances: The liquid is colorless.

Observations: When we combine baking soda and vinegar, it produces sodium acetate or hot ice. When you pour it, it immediately crystallizes, enabling you to build a tower of crystals. This crystallization is an exothermic process.

Type of Change: This type of reaction is a physical change where heat is generated.

Clue: formation of ice or solid.

To know more about sodium acetate crystallization:

https://brainly.com/question/8064057

#SPJ4

The pain medication should the vet student give the injured cow will give about 2.94mg.

Non-steroidal anti-inflammatory drugs (NSAIDs), which are available as injections, pills to take orally, or a liquid to pour on the affected area, are the most popular pain relievers for cattle. Short-term pain management is another application for steroids, according to Funk.

In the treatment of pain brought on by arthritis or following surgery in dogs and cats, non-steroidal anti-inflammatory drugs are among the most popular and efficient medications. This group of medicines includes the brands Rimadyl, Metacam, Dermaxx, and Etogesic.

Given information,

For every 100 pounds 0.2grams

1473 pounds how many grams?

mg of pain medication = 1473 × 0.2/100

mg of pain medication = 2.94mg.

To know more about pain medication visit:

https://brainly.com/question/12926291

#SPJ1

Answer:

When the partially positive end of one water molecule is attracted to the partially negative end of another water molecule

Explanation:

Water is made of \(H_{2} O\). The polar molecules H and O forms the hydrogen bond.

A hydrogen bond exists as an inter molecular force (IMF) that forms a certain kind of dipole-dipole attraction when a hydrogen atom bonded to a strongly electronegative atom lives in the vicinity of another electronegative atom with a lone pair of electrons. Inter molecular forces (IMFs) happen between molecules.

The  partial negative charge on  oxygen  attracts the positively charged H+  forming the hydrogen bonds. In the case of water, hydrogen bonds are  formed between the neighboring hydrogen and oxygen atoms of  the adjacent water molecules. This hydrogen bonds are responsible for the liquid state of water.

To learn more about  hydrogen bond refer to:

https://brainly.com/question/25617532

#SPJ2

The amount of heat required to raise the temperature of 125.0 g of aluminum by 12°C is 1611 joules.

Temperature = 12°C

Mass = 125.0 g

To estimate the amount of heat required, we need to use the formula:

Q = m * c * ΔT

Q = the amount of heat in joules

m = the mass of the substance in kilograms

c = the specific heat capacity of the substance

ΔT = the change in temperature in degrees

The specific heat capacity of aluminum = 0.897 J/g°C.

Q = 125.0 g * 0.897 J/g°C * 12°C

Q = 1611 J

Therefore, we can conclude that the amount of heat required is 1611 J.

To learn more about the heat required

https://brainly.com/question/3727855

#SPJ4

The lower first ionization energy of sodium is due to the relatively weak attraction between the outermost electron and the nucleus, as well as the shielding effect provided by the inner electrons.

The ionization energy refers to the amount of energy required to remove an electron from an atom or ion in its gaseous state. In the case of sodium, the first ionization energy is significantly lower than the second ionization energy. This can be explained by understanding the electron configuration and the principles of electron shielding and effective nuclear charge.

Sodium has an atomic number of 11, meaning it has 11 protons in its nucleus and 11 electrons surrounding it. These electrons are arranged in energy levels or shells, with the first shell containing 2 electrons and the second shell containing 8 electrons. The outermost electron in sodium is in the third energy level.

The first ionization energy is the energy required to remove the outermost electron from the atom. In sodium, this electron is relatively far from the nucleus and experiences less attraction to the positively charged protons.

Additionally, the outer electron in sodium experiences significant electron shielding from the inner electrons, meaning that the inner electrons partially shield the outer electron from the full attractive force of the nucleus.

As a result, it is easier to remove the outermost electron in sodium, and hence, the first ionization energy is relatively low. Once the outermost electron is removed, sodium becomes a positively charged ion (Na+).

The second ionization energy refers to the energy required to remove an electron from the Na+ ion, which now has a stronger effective nuclear charge due to the reduced electron-electron repulsion and decreased shielding effect. Consequently, it is more difficult to remove an electron from the Na+ ion, leading to a higher second ionization energy compared to the first ionization energy.

For more such questions on ionization energy visit:

https://brainly.com/question/30831422

#SPJ8

Answer:

because that is the last group the ones before it are more reactive im sorry if this not what you were looking for.

The heat absorbed or released by a substance when its temperature changes depend on its heat capacity (Cp). The Cp of the water is 1 cal/g°C. The heat released can be found by the following equation:

Where,

Q is the heat released or absorbed

m is the mas oof water, 15.5g

Cp is the heat capacity of water, 1cal/g°C

dT is the change in temperature

We replace the known values

In Joules the heat released will be:

the heat has a negative value, this is because the water released heat.

Answer:

The amount of heat released is 504 calories or 2019 joules

Answer:

The formula for the confirming precipitate is CoI₂.

Therefore, the final formula for each precipitate is:

Cu(NO₂)₂ in test tube 11

Fe(OH)₃ in test tube 12

Ni(C₄H₆N₂O₂)₂ in test tube 13

CoI₂ in the confirming precipitate

The formula for the transition metal cation in the test tube 14 is Co²+.

Explanation:

Step - 1: By adding potassium nitrite that has been acidified with acetic acid, Cu2+ cations will be precipitated as Cu(NO2).₂. The precipitate in test tube 11 has the formula Cu(NO2)2.

Cu²+(aq) + 2NO₂⁻(aq) + 2H⁺(aq) → Cu(NO₂)₂(s) + 2H₂O(l)

Step - 2: By adding aqueous ammonia to the solution in test tube 12, Fe3+ cations will precipitate as Fe.(OH)3. The precipitate in test tube 12 has the formula Fe(OH)3.

Fe³+(aq) + 3OH⁻(aq) → Fe(OH)₃(s)

Step - 3: By adding an ethanol solution of dimethylglyoxime, the Ni2+ cations will precipitate specifically as Ni(C4H6N2O2).₂. The formula for the precipitate in test tube 13 is Ni(C₄H₆N₂O₂)2. Co2+ is the transition metal cation present in test tube 14.

Ni²+(aq) + 2C₄H₆N₂O₂⁻(aq) → Ni(C₄H₆N₂O₂)₂(s)

Step - 4. The addition of aqueous potassium iodide to the original mixture of all four cations will precipitate Co²+ cations as CoI₂. The confirming precipitate has the formula CoI2.

Co²+(aq) + 2I⁻(aq) → CoI₂(s)

Answer:

Explanation:

Volume of one mole of a gas = 22.4 litre.

No of molecules in one mole of gas = 6.02 x 10²³ .

Volume of one molecule = 4/3 π R³

= 4/3 x 3.14 x ( 167 x 10⁻¹² m )³

= 19.5 x 10⁶ x 10⁻³⁶ m³

=19.5 x 10⁻³⁰ m³

= 19.5 x 10⁻³⁰ x 10³ litre .

=  19.5 x 10⁻²⁷ litre .

So volume occupied by molecules in one mole of gas

= 19.5 x 10⁻²⁷ x 6.02 x 10²³  litre

117.4 x 10⁻⁴ litre

= .01174 litre.

Excluded volume

= ( 22.4 -  .01174  ) litre .

= 22.388 litre.