The least massive of all the alkaline earth metals. Who
am I?

Answer:

O A. The electrons orbit the protons at the atom's center

Explanation:

It was proved by Bohr that electrons are revolving in orbits which creates magnetic fields around the atom.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 20 mL

density = 2 g/mL

The mass is

mass = 20 × 2

We have the final answer as

Hope this helps you

The SL-3 components of the M240B medium machine gun are used for barrel replacement and maintenance.

The SL-3 components of the M240B consist of a spare barrel and a barrel bag. The spare barrel is an essential component for sustained firing and allows for the replacement of a hot or worn-out barrel during extended periods of continuous use. When the barrel becomes overheated, it can negatively impact the weapon's accuracy and potentially cause malfunctions. The spare barrel is designed to be quickly swapped with the hot barrel to ensure optimal performance and prevent damage to the weapon.

The barrel bag is used to safely store the hot or dirty barrel after it has been replaced. It serves as a protective cover to prevent accidental contact and potential burns while the barrel is still hot. Additionally, the bag helps contain any carbon or residue that may be present on the barrel, preventing it from spreading and contaminating other equipment or personnel. The barrel bag is an essential part of the maintenance process, ensuring safe handling and transportation of the replaced barrel until it can be properly cleaned and inspected.

Learn more about safe handling of chemicals here: brainly.com/question/1788721

#SPJ11

Answer:

Scientific notation

Explanation:

For example 10000000000 =10 to the power of ten

Explanation:

1 sodium must contain free eelctron cuz electricity is created due to flow of electron

2 suspension

1. To conduct electricity, a solution must contain ions and free electrons.

2. The particles in a suspension can be separated from heterogeneous mixtures by passing the mixture through a filter.

3. Solutions - Smaller than 1 nm

Colloids - 1 nm to 1000 nm

Suspensions - Larger than 1000 nm

In a solution, ions can be present when an ionic compound dissolves and dissociates into its constituent ions. These ions can move freely within the solution, allowing for the conduction of electricity.

Free electrons are not bound to any specific atom and are able to move through the material, facilitating the flow of electric current.

A suspension is a heterogeneous mixture in which solid particles are dispersed in a liquid or gas medium.

Solutions contain particles that are smaller than 1 nanometer (nm) in size. Colloids consist of particles that range in size from 1 nm to 1000 nm. Suspensions contain particles that are larger than 1000 nm in size.

To learn more about the electricity, follow the link:

https://brainly.com/question/33513737

#SPJ6

Therefore, the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M hydrosulfuric acid solution are pH = 7.78 and [S²⁻] = 2.31x10⁻¹¹ M.

Hydrosulfuric acid (H₂S) is a weak acid that dissociates in water to produce hydrogen ions (H⁺) and bisulfide ions (HS⁻). H₂S(aq) + H₂O(l) ⇌ H₃O⁺(aq) + HS⁻(aq)

The bisulfide ions (HS⁻) in turn reacts with water to produce hydronium ions (H₃O⁺) and sulfide ions (S²⁻).

HS⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + S²⁻(aq) Ka1

= 1.0x10⁻⁷,

Ka2 = 1.0x10⁻¹⁹

To calculate the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we must first determine if H₂S(aq) is a strong or weak acid.

It has Ka1 = 1.0x10⁻⁷, which is a very small value; thus, we can conclude that H₂S(aq) is a weak acid.

To calculate the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we need to use the Ka2 value (Ka2 = 1.0x10⁻¹⁹) and a chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0Change -x +x +x

Equilibrium (6.89x10⁻² - x) x xKa2 = [H₃O⁺][S²⁻]/[HS⁻]1.0x10⁻¹⁹

= x² / (6.89x10⁻² - x)

Simplifying: 1.0x10⁻¹⁹ = x² / (6.89x10⁻²)

Thus: x = √[(1.0x10⁻¹⁹)(6.89x10⁻²)]

x = 2.31x10⁻¹¹ M

Thus, [S²⁻] = 2.31x10⁻¹¹ M

To calculate the pH of the solution, we can use the Ka1 value and the following chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0

Change -x +x +x

Equilibrium (6.89x10⁻² - x) x x

Ka1 = [H₃O⁺][HS⁻]/[H₂S]1.0x10⁻⁷

= x(6.89x10⁻² - x) / (6.89x10⁻²)

Simplifying: 1.0x10⁻⁷ = x(6.89x10⁻² - x) / (6.89x10⁻²)

Thus: x = 1.66x10⁻⁸ M[H₃O⁺]

= 1.66x10⁻⁸ M

Then, pH = -log[H₃O⁺]

= -log(1.66x10⁻⁸)

= 7.78 (rounded to two decimal places)

To know more about concentration visit:

https://brainly.com/question/30862855

#SPJ11

7. a. Carbon dioxide (CO2) is the gas that might be dissolved in the blood on the right side of the heart.

b. CO2 is produced as a waste product of cellular respiration, which is the process by which cells produce energy.

c. Before the blood enters the left side of the heart, CO2 is transported from the tissues to the lungs, where it is exchanged for oxygen.

8. The flow pattern of the blood inside the circulatory system is unidirectional,  with the blood flowing from the right atrium to the right ventricle, then to the lungs, and from the lungs to the left atrium and left ventricle, and finally to the body.

The entrances and exits to the heart need valves to maintain the unidirectional flow pattern of the blood.

The atrioventricular valves (tricuspid valve on the right side and mitral valve on the left side) prevent the backflow of blood from the ventricles to the atria, while the semilunar valves (pulmonary valve on the right side and aortic valve on the left side) prevent the backflow of blood from the arteries to the ventricles.

The heart also needs a pacemaker to coordinate the contraction of the atria and the ventricles to ensure the efficient pumping of blood.

Learn more about blood gases at: https://brainly.com/question/30334511

#SPJ1

The major organic product obtained is hexanol.

With a six-carbon chain and the condensed structural formula CH3(CH2)5OH, 1-hexanol is an organic alcohol. This white liquid is miscible with ethanol and diethyl ether but only slightly soluble in water.

Hexanal is an alkyl aldehyde used in the flavour business to create fruity flavours. It is also known as hexanaldehyde or caproaldehyde. It smells like freshly cut grass, similar to cis-3-hexenal. It has the potential to be helpful as a fruit preservation natural extract.

To learn more about hexanol visit:

https://brainly.com/question/25645408

#SPJ4

The combustion of methane produces carbon dioxide and water. 6230 L of methane will be produced in the reaction.

A combustion reaction is a chemical equation in which the reactant reacts in the presence of oxygen molecules. The combustion reaction of methane is given as:

CH₄ (g)+ 2O₂ (g) → CO₂ (g) + 2 H₂O(g)

From the reaction, it can be said that methane and water are in a ratio of 1: 2.

At STP the volume of water is

10L x 1g/ml x 1ml/0.001L = 1 × 10⁴g of water

Moles of water are:

1 × 10⁴g of water/18g/mole MW of water = 5.56x10² moles of water

From the ratio of methane and water and moles of methane are calculated as:

1/2 x 5.56x10² moles = 2.78x10² moles of methane

The volume of methane is calculated as:

2.78x10² moles of methane x 22.4L/mole = 6.23x10³ L of methane

Therefore, 6230 L of methane is required to produce 10 L of water.

Learn more about combustion reaction here:

https://brainly.com/question/9461700

#SPJ1

Answer:

2.38 g of oxygen (O2).

Explanation:

What is given?

Mass of potassium chlorate (KClO3) = 6.06 g.

Molar mass of KClO3 = 122.4 g/mol.

Molar mass of oxygen (O2) = 32 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation. Remember that the decomposition of a compound produces two or more products:

Now, let's convert 6.06 g of KClO3 to moles using its molar mass:

You can see in the chemical equation that 2 moles of KClO3 produce 3 moles of O2. By doing a rule of three with this data, we obtain that:

The final step is to convert from 0.0743 moles of O2 to grams using its molar mass, like this:

The answer is that we will produce 2.38 g of oxygen (O2) from the decomposition of 6.06 g of potassium chlorate (KClO3).

The statement that aptly captures the comparison between ionic bonds and covalent bonds is; covalent bonds tend to be less polar than ionic bonds.

Covalent bonds are formed when a pair of electrons are shared between two atoms in a bond.

Ionic bonds involve a transfer of electrons from one atom to another. Ionic compounds are actually an ion pair held together by electrostatic interaction rather than an actual bond.

The electronegativity differences between atoms determine the degree of polarity of the bond. The electronegativity difference between atoms in an ionic bond is much higher than those between covalent compounds. As such, ionic bonds are much more polar than covalent compounds.

Learn more: https://brainly.com/question/11527546

Answer:

C.

Covalent bonds tend to be less polar than ionic bonds.

Answer:

4. 1.5moles

5. 0.405moles

6. 1 mol

Explanation:

To find the number of moles in each susbtance in this question, we divide each number of atom/molecule measurement by Avagadro's number (6.02 × 10^23 atoms)

That is; nA = n × 6.02 × 10^23 atoms

n = nA ÷ 6.02 × 10^23 atoms

Where;

nA = number of atoms

n = number of moles

4.) n of Carbon = 9.03 x 10^23 ÷ 6.02 × 10^23

n = 1.5 × 10^ (23-23)

n = 1.5 × 10^0

n = 1.5 × 1

n = 1.5moles.

5.) n of H2O = 2.44 x 10^23 ÷ 6.02 × 10^23

n = 0.405 × 10^ (23-23)

n = 0.405 × 10^0

n = 0.405moles

6.) n of lithium = 6.02 x 10^23 Li atoms ÷ 6.02 × 10^23

n = 1 × 10^ (23-23)

n = 1 × 10^0

n = 1 mol

Answer:

D

Explanation:

Solvent is the material that is dissolving another material​. Thus, option D is correct.

A solvent is a substance that dissolves another substance to form a solution. The substance that is being dissolved is called the solute, and the substance that is doing the dissolving is called the solvent. The solute is usually present in a smaller amount than the solvent, and it is the solvent that determines the physical properties of the solution, such as its density, viscosity, and boiling point.

For example, when salt is dissolved in water, the salt is the solute and the water is the solvent. The water molecules surround the salt molecules and break them apart, so that the salt ions are free to move around in the solution. The solution is then a homogeneous mixture of salt ions and water molecules.

Thus, option D is correct.

Learn more about solvent on:

https://brainly.com/question/11985826

#SPJ3

The  true statement about the of Qin's son who ruled after him is that, the country rose up against him.

The third option is correct.

More about the Qin?

The first dynasty of Imperial China is referred to as the Qin dynasty.

The Qin dynasty, so named after its homeland in Qin state, emerged as a fief of the Western Zhou and existed for more than five centuries until 221 BC, when it was briefly elevated to an empire but only for a short time, lasting until 206 BC.

The first emperor of China, Qin Shi Huang, who had several sons of which his  immediate successor  Qin Er Shi had a short and tumultuous reign, as his rule was marked by political turmoil and rebellion.

Learn more about the Qin dynasty at:

https://brainly.com/question/10022890

#SPJ1

The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

Learn more about Carbon Cycle

brainly.com/question/13729951

#SPJ11

Answer:

because it is going from a solid to a gas.

Explanation:

also it's still cold

The temperature of a substance does not change while the state does, this shows that the slope has positive gradient. So, the answer is slope > 0.

To know more about heating curve visit:

https://brainly.com/question/16953463

#SPJ4

Answer:

Star's

Explanation:

Stars have their own brightness

Answer:

pressure=force / volume

5.8÷3.9

=1.5 ml

Answer:

true i think

Explanation:

Answer:

When molecules are heated (absorb energy) they move faster – some, or all of the heat energy is converted to kinetic energy. So, when a gas is heated, the effect is to make the molecules move faster.

Explanation:

When you heat a gas, both its vapor pressure and the volume it occupies increase. The individual gas particles become more energetic and the temperature of the gas increases.

Answer:

The electron configuration for the first row transition metals consists of 4s and 3d subshells with an argon (noble gas) core. This only applies to the first row transition metals, adjustments will be necessary when writing the electron configuration for the other rows of transition metals.

Explanation:

When a polypeptide is being assembled, the bond that forms between a newly added amino acid and the previous amino acid in the chain is a peptide bond.

During protein synthesis, amino acids are linked together to form a polypeptide chain. The bond that forms between the carboxyl group of one amino acid and the amino group of another amino acid is called a peptide bond. This bond is formed through a dehydration synthesis reaction, also known as a condensation reaction.

In a dehydration synthesis reaction, a water molecule is removed as the peptide bond forms between the amino acids. The carboxyl group of one amino acid reacts with the amino group of another amino acid, resulting in the formation of a peptide bond and the release of a water molecule.

The peptide bond is a covalent bond and it forms a strong linkage between the adjacent amino acids in the polypeptide chain. It is responsible for the linear arrangement of amino acids in proteins. The amino acid sequence, determined by the order of peptide bonds, plays a crucial role in determining the protein's structure and function.

In summary, the bond that forms between a newly added amino acid and the previous amino acid in a polypeptide chain is a peptide bond, which is formed through a dehydration synthesis reaction.

Learn more about peptide bond here:

https://brainly.com/question/32085571

#SPJ11

12 moles O2 is a possible way to describe the elemental oxygen component in the reaction.

Define elemental oxygen form?

At normal temperatures and pressures, elemental oxygen is present as a gas, most frequently in the form of O2. This crucial ingredient, which is a crucial part of cellular respiration, is required for life on this planet.

This oxidation-reduction (redox) reaction is taking place:

8 S - 48 e- → 8 S (oxidation)

24 O + 48 e- → 24 O- (reduction)

O2 is an oxidizing agent, whereas S8 is a reducing agent.

Because each substance contains a huge number of atoms and molecules, we use the mole (mol) to express the amount of substances in chemistry. For the researcher who discovered how many atoms there are in 12 grams of carbon, the value provided, 6.022 x 1023 is known as Avogadro's number.

To know more about mole use link below:

https://brainly.com/question/15356425

#SPJ1

The best way to represent the concentration of a 1.75 m K₂CrO₄ solution is [K₂CrO₄] = 1.75M.

Concentration of any substance will give idea about the quantity of that substance present in given volume.

Concentration will be express in many ways like molarity, molality, mole fraction and so on. And to express the quantity in concentration we will use the big square closed bracket like this [ ].

Hence, best way is [K₂CrO₄] = 1.75M.

To know more about concentration, visit the below link:

https://brainly.com/question/17206790

Answer:

B.

Explanation:

Answer:

the third one

Explanation:

When you breathe in, you inhale oxygen and exhale carbon dioxide

Answer:

They live in the open snow

Explanation:

Approximately 162 grams of N2 are needed to produce 35 grams of H2.

The balanced chemical equation for the reaction between nitrogen gas (N2) and hydrogen gas (H2) to produce ammonia (NH3) is:

N2 + 3H2 → 2NH3

From this equation, we can see that the mole ratio of N2 to H2 is 1:3. This means that for every 1 mole of N2 used, 3 moles of H2 are consumed.

To calculate how many grams of N2 are needed to produce 35 grams of H2, we first need to convert the mass of H2 to moles:

moles of H2 = mass / molar mass

molar mass of H2 = 2.016 g/mol

moles of H2 = 35 g / 2.016 g/mol ≈ 17.37 mol

Since the mole ratio of N2 to H2 is 1:3, the number of moles of N2 needed is one-third of the number of moles of H2:

moles of N2 = (1/3) × moles of H2

moles of N2 = (1/3) × 17.37 mol ≈ 5.79 mol

We can convert the moles of N2 to grams using the molar mass of N2:

molar mass of N2 = 28.02 g/mol

mass of N2 = moles × molar mass

mass of N2 = 5.79 mol × 28.02 g/mol ≈ 162 g

Therefore, approximately 162 grams of N2 are needed to produce 35 grams of H2.

Learn more about mole ratio here : brainly.com/question/19099163

#SPJ1

Answer:

1. a) Crystalline hydrated salt lose their mass or moisture on exposure to the air and change into amorphous salt, the phenomenon is called efflorescence.

b) Two salts that x could be are gypsum (Caso4.H2O) and copper (II) sulfate (CuSO4.H2O).

Gypsum (Caso4.H2O) form anhydrite(CaSO4), when exposed to air and copper (II) sulfate (CuSO4.H2O) form a white layer of anhydrous copper (II) Sulfate when expose to sir.

2. a) Salt hydrolysis is defined as the ions from salts react with water and form either basic or an acidic solution.

b) Two examples of salts that produce alkaline solutions when dissolving in water are sodium bicarbonate (NaHCO3) and Calcium Carbonate (CaCO3).