Lithium (Li) and oxygen (O) are both in period 2. They both have _____.
the same number of protons
two electron shells
the same number of electrons
similar properties ​

Answer:

examples of type of matter that circulate through the environment are carbon, nitrogen, and water

The total pressure of the gas is calculated as 849 mmHg.

The term partial pressure is the pressure that is exerted by an individual gas in a mixture of gases.

In this case, the partial pressures of hydrogen and water are 789 mmHg and  60 mmHg respectively.

Thus, the total pressure of the gas =  60 mmHg +  789 mmHg = 849 mmHg.

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The statement "1/2 of an oxygen atom can combine with 2/3 of a hydrogen atom" is false because Atoms are the basic building blocks of matter and cannot be divided into smaller parts without breaking down the atom's structure.

An oxygen atom is composed of 8 protons, 8 neutrons, and 8 electrons, and it is not possible to divide an oxygen atom into halves. Similarly, a hydrogen atom consists of 1 proton, 1 electron, and 0 or 1 neutron, and it cannot be divided into thirds.

When atoms combine to form molecules, they do so in specific ratios determined by their chemical properties.

In the case of oxygen and hydrogen, the most common combination is two hydrogen atoms and one oxygen atom, which combine to form a water molecule (\(H_2O\)). This is because the outer electron shells of the oxygen atom and the hydrogen atoms can interact in a way that stabilizes the resulting molecule.

Therefore the given statement is false

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Answer:

we know, at STP ( standard temperature and pressure).

we know, volume of 1 mole of gas = 22.4L

weight of 1 Litre of hydrogen gas = 0.09g

so, weight of 22.4 litres of hydrogen gas = 22.4 × 0.09 = 2.016g ≈ 2g = molecular weight of hydrogen gas.

similarly,

weight of 2L of a gas = 2.88gm

so, weight of 22.4 L of the gas = 2.88 × 22.4/2 = 2.88 × 11.2 = 32.256g

hence, molecular weight of the gas = 32.256g

vapor density = molecular weight/2

= 32.256/2 = 16.128g

hence, vapor density of the gas is 16.128g.

Explanation:

Answer:

A. AgNO₃ + NaCl —> AgCl + NaNO₃

B. Mg(NO₃)₂ + 2KOH —> 2KNO₃ + Mg(OH)₂

C. 3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + 3LiNO₃

Explanation:

The equation given in the question above can be balanced as follow.

A. AgNO₃ + NaCl —> AgCl + NaNO₃

The above equation is already balanced.

B. Mg(NO₃)₂ + KOH —> KNO₃ + Mg(OH)₂

There are 2 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 2 before KOH as shown below:

Mg(NO₃)₂ + 2KOH —> KNO₃ + Mg(OH)₂

There are 2 atoms of K on the left side and 1 atom on the right side. It can be balance by writing 2 before KNO₃ as shown below:

Mg(NO₃)₂ + 2KOH —> 2KNO₃ + Mg(OH)₂

Thus, the equation is balanced.

C. LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + LiNO₃

There are 3 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 3 before LiOH as shown below:

3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + LiNO₃

There are 3 atoms of Li on the left side and 1 atom on the right side. It can be balance by writing 3 before LiNO₃ as shown below:

3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + 3LiNO₃

Thus, the equation is balanced.

The tiny bubbles observed by the student are evidence of this gas being released. Therefore, the mass of the mixture is expected to decrease as the gas escapes into the air.

The most likely outcome is that the mass of the mixture will be less than 125 g due to the release of carbon dioxide gas as a result of the reaction between the baking soda (sodium bicarbonate) and vinegar (acetic acid).

A chemical reaction is a process, often involving the breaking or formation of interatomic bonds, in which one or more chemicals are transformed into others.

A student weighs a sample of baking soda and a beaker of vinegar in accordance with this inquiry. The vinegar and baking soda are then combined by the pupil.

However, after being combined, the weight of the baking soda, beaker, and vinegar decreased from 65g to 63g. This is due to the fact that a gas was created during the chemical reaction, making it impossible to weigh.

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Answer:

a

Explanation:

as the earth rotate around the sun it appears to be moving across the sky

Answer:

The answer is option A

Explanation:

From Earth, the Sun looks like it moves across the sky in the daytime and appears to disappear at night. This is because the Earth is spinning towards the east. The Earth spins about its axis, an imaginary line that runs through the middle of the Earth between the North and South poles.

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Answer:

Organic compounds always contain carbon while inorganic compounds contain metal and other elements. Carbon-Hydrogen bonds are the characteristic of organic compounds while these are not found in inorganic compounds. Inorganic compounds contain metal atoms while they are never found in organic compounds.

Deciding whether or not to approve a mortgage Future changes in consumer purchase tendencies can be predicted using classification models.

A mortgage is a kind of loan used to buy or keep up real estate, such as a home, piece of land, or other construction. The borrower agrees to make a series of monthly payments, divided into principal and interest, to the mortgage lender. This frequently emerges as a succession of regular, weekly episodes. After then, the asset is forfeited as loan collateral.

Borrowers are need to fill out an application with their selected lender and fulfill a number of criteria, such as down payments and minimum credit scores. Before going on to the closing stage, mortgage applications must pass a stringent underwriting procedure.

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The Bohr effect refers to the phenomenon where hemoglobin has a decreased affinity for oxygen in conditions of decreased pH and increased levels of carbon dioxide (PCO2). In other words, hemoglobin more readily unloads oxygen in these conditions.

When carbon dioxide is produced by metabolizing tissues, it combines with water to form carbonic acid, which lowers the pH of the blood. As pH decreases, hemoglobin's affinity for oxygen decreases, causing it to more easily release oxygen to the tissues that need it. This allows for efficient oxygen delivery to active tissues and organs during exercise or other metabolic activities.

In contrast, increased pH and decreased PCO2, as would be found in the lungs during gas exchange, increase hemoglobin's affinity for oxygen, enabling it to more efficiently pick up oxygen for transport to the tissues. Decreased pH and increased temperature can also cause a decrease in hemoglobin's affinity for oxygen, facilitating the release of oxygen to the tissues.

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The solubility of KCl is given as 15, which means that 15 grams of KCl can dissolve in 100 grams of water at 20 degrees Celsius. To calculate the grams of KCl required to make a saturated solution in 40 grams of water, we can set up a proportion.

Since the solubility is given for 100 grams of water, we can set up the following proportion:

15 grams KCl / 100 grams water = x grams KCl / 40 grams water

To solve for x, we cross-multiply and then divide:

15 grams KCl * 40 grams water = 100 grams water * x grams KCl

600 grams KCl = 100 grams water * x grams KCl

Dividing both sides by 100 grams water, we get:

x grams KCl = (600 grams KCl) / (100 grams water)

x grams KCl = 6 grams KCl

Therefore, to make a saturated solution in 40 grams of water, we would need 6 grams of KCl.

This calculation is based on the assumption that the solubility of KCl remains constant with the change in the amount of water.

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Answer:

C.) Lactobacillus

Explanation:

Is a prokaryote with a simple rod shaped structure. Similar to other prokaryotic bacterium of its shape it has a cell wall, and capsule.

one mole of NaCl will dissolve into two moles of particles (one mole of Na+ ions and one mole of Cl- ions) in aqueous solution.

When one mole of the ionic compound NaCl dissolves in aqueous solution, it dissociates into its constituent ions, Na+ and Cl-. Therefore, one mole of NaCl will dissolve into two moles of particles (one mole of Na+ ions and one mole of Cl- ions) in aqueous solution.

When one mole of NaCl dissolves in water, it will dissociate into one mole of Na+ ions and one mole of Cl- ions, resulting in a total of two moles of particles. This is because each molecule of NaCl produces two ions upon dissociation.

In an aqueous solution, these ions are surrounded by water molecules, which interact with the ions through ion-dipole forces, stabilizing them and preventing them from recombining into the original NaCl crystal. The resulting solution contains a mixture of hydrated Na+ and Cl- ions, and the concentration of these ions depends on the initial concentration of NaCl and the degree of dissociation.

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Answer:

Particles has the highest kinetic energy when they are in the gaseous state. Kinetic energy is related to heat (also called thermal energy

Answer:

Water that is present beneath the Earth's surface

Answer:b

Explanation:

Answer: The temperature of the gas if 65.85g of N2 are placed in 17.5L container with a pressure of 1988 mmHg is 1780. 6° C

Explanation:

The ideal gas law states that the volume, pressure and temperature of the a gas is related to the number of moles.

It is represented thus;

P V = n R T

Parameters :

Pressure, P = 1988 mmHg

Volume, V = 17.5 L

number of moles, n = mass ÷ molar mass

mass of N2 = 65.84g

Molar mass of N2 = 28.02 g/ mol

n = 65.85 ÷ 28.02

n = 2. 350 moles.

Temperature = ?

Universal gas constant, R = 8.314 J/mol. K

Calculations :

T = P V ÷ n R

T = 1988 × 17.5 ÷ 2.350 × 8.314

T = 34790 ÷ 19. 5379

T = 1780. 6 ° C

Thus, the temperature of the gas is 1780. 6 ° C

The two components of product/service feasibility analysis are technical feasibility and market feasibility.

The two components of product/service feasibility analysis are technical feasibility and market feasibility.

Technical feasibility : Technical feasibility is an aspect of the product/service feasibility analysis that involves determining whether a company has the capability and resources to create the product or provide the service successfully. Technical feasibility analysis examines whether a company can develop the product or service, how long it will take to do so, what resources it will require, and how much it will cost.

Market feasibility: Market feasibility is an aspect of product/service feasibility analysis that focuses on the company's potential market, the competition, and the likelihood of achieving commercial success. Market feasibility is concerned with determining if there is enough demand for the product or service to make it profitable.

The market feasibility analysis is conducted by surveying potential customers, evaluating competitors' strengths and weaknesses, and conducting market research to determine what is driving customer demand.

Thus, the two components of product/service feasibility analysis are technical feasibility and market feasibility.

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The two components of product/service feasibility analysis are market feasibility and technical feasibility.

Market feasibility involves evaluating the potential demand for the product or service in the target market. This includes analyzing the size of the market, identifying the target customers, understanding their needs and preferences, and assessing the competition.

Technical feasibility, on the other hand, focuses on assessing whether the product or service can be developed and implemented effectively. It involves evaluating the availability of necessary technology, resources, and expertise required to develop and deliver the product or service.

By conducting both market feasibility and technical feasibility analysis, businesses can determine the viability and potential success of their product or service in the market.

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Answer:

Explanation:the answer

Answer:

Bro.

Mercury – 1,516mi (2,440km) radius; about 1/3 the size of Earth.

Venus – 3,760mi (6,052km) radius; only slightly smaller than Earth.

Earth – 3,959mi (6,371km) radius.

Mars – 2,106mi (3,390km) radius; about half the size of Earth.

Jupiter – 43,441mi (69,911km) radius; 11x Earth's size

Explanation:

From the given information , the pH of a 0.40 M solution of K2SO3 is approximately 8.45.

Step 1: Write the balanced chemical equation for the dissociation of K2SO3 in water.

K2SO3 (aq) ↔ 2K+ (aq) + SO3^2- (aq)

Step 2: Identify the ions formed and their concentrations.

From the balanced equation, we can see that for every 1 mole of K2SO3 that dissolves, 2 moles of K+ and 1 mole of SO3^2- ions are produced. Therefore, the concentration of K+ ions is 2 × 0.40 M = 0.80 M, and the concentration of SO3^2- ions is 0.40 M.

Step 3: Determine the hydrolysis reaction and equilibrium expression.

The K+ ion does not undergo hydrolysis since it is the conjugate cation of a strong base. However, the SO3^2- ion can hydrolyze in water according to the following reaction:

SO3^2- (aq) + H2O (l) ↔ HSO3^- (aq) + OH^- (aq)

The equilibrium expression for this hydrolysis reaction is:

Kw = [HSO3^-] [OH^-] / [SO3^2-]

Step 4: Set up an ICE (Initial, Change, Equilibrium) table.

Let x be the concentration of OH^-. Since 1 mole of OH^- is produced for every 1 mole of SO3^2- that hydrolyzes, the change in concentration for OH^- is also x. The initial concentration of SO3^2- is 0.40 M, and the initial concentration of HSO3^- is assumed to be negligible. The initial concentration of OH^- is 0 M.

Initial: [SO3^2-] = 0.40 M, [HSO3^-] = 0 M, [OH^-] = 0 M

Change: [SO3^2-] = -x M, [HSO3^-] = x M, [OH^-] = x M

Equilibrium: [SO3^2-] = 0.40 - x M, [HSO3^-] = x M, [OH^-] = x M

Step 5: Substitute the equilibrium concentrations into the equilibrium expression.

Kw = [x] [x] / [0.40 - x]

Step 6: Simplify the expression and solve for x.

Since the concentration of OH^- is much smaller than 0.40 M, we can approximate 0.40 - x to be 0.40.

Kw = x^2 / 0.40

Given that Kw is 1.0 × 10^-14 at 25°C, we can solve for x:

1.0 × 10^-14 = x^2 / 0.40

x^2 = 1.0 × 10^-14 × 0.40

x = √(1.0 × 10^-14 × 0.40)

x ≈ 6.32 × 10^-8 M

Step 7: Calculate the pOH and pH.

pOH = -log10 [OH^-] = -log10 (6.32 × 10^-8) ≈ 7.20

pH = 14 - pOH ≈ 14 - 7.20 ≈ 6.80

The pH of a 0.40 M solution of K2SO3 is approximately 8.45.

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Answer:

1.14 moles of oxygen will react

Explanation:

The balanced equation of reaction between iron and oxygen is  

4 Fe + 3 O₂  → 2 Fe₂O₃

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

The molar mass of iron being Fe 55.85 g/mole, then the following amount of mass reacts by stoichiometry: 4 moles* 55.85 g/mole=223.4 g

You can apply the following rule of three: if by stoichiometry 223.4 grams of Fe react with 3 moles of O₂, 84.9 grams of Fe react with how many moles of O₂?

\(moles of O_{2} =\frac{84.9 grams of Fe*3 moles ofO_{2} }{223.4 grams of Fe}\)

moles of O₂= 1.14 moles

1.14 moles of oxygen will react

Answer:

the mass of a tree is primary carbon

Explanation:

the the carbon comes from carbon dioxide during photosynthesis

Answer:

Plants get all the carbon, hydrogen, and oxygen they need from carbon dioxide and water, which they use to build carbohydrates during photosynthesis. To build other kinds of molecules they also need elements like nitrogen, phosphorous, and sulfur. Plants get these as well as other elements from the soil.

Explanation:

Answer:

D. Ruler

Explanation:

Use the formula to find the volume of a cuboid by measuring the length, width, and height and multiplying all of them by each other.

The average rate of the reaction over the first 450 seconds -2.2×10⁻³ M/s

Speed is defined as the rate of change of the distance moved with time. Mathematically, it can be expressed as:

Speed = distance / time

With the above idea, we can obtain the rate of the reaction as illustrated below:

Rate = Change in concentration / time

Rate = -1 / 450

Rate = -2.2×10⁻³ M/s

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D is correct for number 2. i just finished

explanation; i got it right

The reason why the synthesis of sulfanilamide starts with acetanilide instead of aniline is because acetanilide is more easily obtained and purified compared to aniline.

Acetanilide also has a lower tendency to undergo undesirable side reactions during the synthesis.

When aniline is reacted with chlorosulfonic acid, the amino group on the benzene ring reacts with the acid to form an ammonium ion. This ammonium ion then undergoes a nucleophilic substitution reaction with the chloride ion, resulting in the formation of p-chloroaniline. The reaction can be represented as:

C6H5NH2 + HClSO3 → C6H5NH3+ ClSO3^-

C6H5NH3+ ClSO3^- + H2O → C6H4ClNH2 + H2SO4

So if we started the synthesis with aniline instead of acetanilide, the product of the reaction with chlorosulfonic acid would be p-chloroaniline instead of p-chloroacetanilide.

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saturated solution: solution that has passed the saturation limit

Answer:

Actor

Explanation:

99% sure ! All the others include some.sort of formula or science

Answer:

actor

Explanation:

acting has nothing to do with science, actors that we have today didn't do science they studied arts.

chemistry deals with chemical

Answer

- What is an electron?

An electron a stable subatomic particle with a negative charge of electricity, it is found in all atoms and acting as the primary carrier of electricity in solids.

- How does the electrons movement creates an electric current?

Electrons flow in a certain rate, creating an electric current. So the electrons moving freely from one place to another place will conduct electric current.