What groups of elements are ionic compounds made of?​

Answer:

The cytoskeleton

Explanation:

The cytoskeleton provides a structural framework for the cell, serving as a scaffold that determines cell shape and the general organization of the cytoplasm. In addition to playing this structural role, the cytoskeleton is responsible for cell movements.

Answer:

B

Explanation:

If AH and AS are both negative  will a low temperature make a reaction spontaneous.

A spontaneous reaction is a reaction that favors the formation of products at the conditions under which the reaction is occurring. A roaring bonfire (see figure below) is an example of a spontaneous reaction.

A fire is exothermic, which means a decrease in the energy of the system as energy is released to the surroundings as heat.

The products of a fire are composed mostly of gases such as carbon dioxide and water vapor, so the entropy of the system increases during most combustion reactions.

Therefore,  If AH and AS are both negative  will a low temperature make a reaction spontaneous.

To learn more about Spontaneous reaction, refer to the link:

https://brainly.com/question/13790391

#SPJ2

Answer: The mass concentration for a solution containing 45 g of calcium carbonate for 100 \(cm^{3}\) is 0.045 M.

Explanation:

Given: Mass of calcium carbonate = 45 g

Volume = \(100 cm^{3}\)

Convert \(cm^{3}\) into L as follows.

\(1 cm^{3} = 0.001 L\\100 cm^{3} = 100 cm^{3} \times \frac{0.001 L}{1 cm^{3}}\\= 0.1 L\)

Moles of calcium carbonate (molar mass = 100 g/mol) is as follows.

\(No. of moles = \frac{45 g}{100 g/mol}\\= 0.45 mol\)

Molarity is the number of moles of solute present in a liter of solution.

Hence, molarity (or mass concentration) of given solution is calculated as follows.

\(Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.45 mol}{0.1 L}\\= 0.045 M\)

Thus, we can conclude that the mass concentration for a solution containing 45 g of calcium carbonate for 100 \(cm^{3}\) is 0.045 M.

Answer:

The empirical formula of the compound is C2H5O.

The weaker acid involved in the given reaction is HC₂O₄⁻. Option B is correct.

The position of equilibrium in an acid-base reaction can provide information about the relative strength of the acids and bases involved. In the given reaction, if the equilibrium lies to the left, it indicates that the forward reaction is not favored and the reverse reaction is favored.

This means that the products NH₃(aq) and H₂C₂O₄(aq) have a tendency to react and form the reactants HC₂O₄⁻(aq) and NH₄⁺(aq).

Therefore, the acid dissociation constant of HC₂O₄⁻(aq) is K_a1 = 5.9 × 10⁻². The acid dissociation constant of H₂C₂O₄(aq) is K_a2

= 5.9 × 10⁻⁵.

Since the equilibrium lies to the left, it means that the concentration of HC₂O₄⁻(aq) is higher than that of H₂C₂O₄(aq) at equilibrium. This suggests that HC₂O₄⁻(aq) is the weaker acid, as it does not dissociate as much as H₂C₂O₄(aq) does.

Hence, Option B is correct.

To know more about acid-base reaction here

https://brainly.com/question/15686955

#SPJ1

Answer:

B

Explanation:

I did the test

Answer:

Carbohydrates, proteins, and fats are biological macromolecules that are made up of chemical elements which are inherent to chemistry.

Chemistry explain how these macromolecules are bonded together at the molecular level and give an explanation for their behavior.

Explanation:

covalent bonds can form between two nonmetal atoms

covalent bonds can form between atoms of the same element

covalent bonds can form between atoms of different elements

Considering the definition of covalent bonding, the correct answers are:

Chemical bonds are the forces that hold atoms together within compounds.

A covalent bond occurs when atoms share electrons in equal parts, forming a molecule.

In other words, in a covalent bond, the atoms stay together in order to be able to share the electrons in their outermost shell (called the valence shell) to achieve the stability of the molecule that has been formed with the bond. When atoms are joined by this type of bond, new entities are formed, made up of the joined atoms: molecules.

Covalent bonding occurs between atoms of non-metallic elements, which can be the same or different.

In summary, the correct answers are:

Learn more:  

i dont see any processes below

Answer:

Heat and pressure

Explanation:

got it on study island

Answer:

Number of moles =20

Number of molecules present = 20 multipled by avogadro's number.

Answer:

when an electric current is passed through sodium chloride solution, hydrogen gas forms at the negative electrode, chlorine gas forms at the positive electrode and a solution of sodium hydroxide also forms

Answer:

The answer to this reaction would be C-C-OH + H2.

Answer:

When conducting a chemistry lab experiment using chalk (calcium carbonate) in vinegar (acetic acid), there are several limitations and precautions to be aware of:

Limitations of chalk in vinegar chemistry experiment:

Reaction rate: The reaction between chalk and vinegar is relatively slow, which may require a longer observation period or higher concentration of vinegar to observe significant changes within a reasonable time frame.

Solubility: Chalk may not dissolve completely in vinegar, resulting in incomplete reaction or difficulty in obtaining accurate results.

Product formation: The reaction between chalk and vinegar produces carbon dioxide gas, water, and calcium acetate. The carbon dioxide gas may escape into the atmosphere, leading to loss of product and inaccurate measurements.

pH: Chalk is a basic substance, and the reaction with vinegar, which is acidic, may result in neutralization, leading to a decrease in the overall acidity of the reaction mixture.

Precautions to take in chalk in vinegar chemistry experiment:

Ventilation: The reaction between chalk and vinegar produces carbon dioxide gas, which can displace air and potentially cause asphyxiation in a closed or poorly ventilated area. Conduct the experiment in a well-ventilated area or under a fume hood to ensure adequate air circulation.

Eye and skin protection: Vinegar is an acid and can cause skin and eye irritation. Wear appropriate personal protective equipment (PPE), such as gloves and goggles, to protect yourself from contact with vinegar or any other chemicals used in the experiment.

Chemical handling: Handle the chemicals, including chalk and vinegar, with care, following proper lab safety protocols. Avoid ingestion, inhalation, or direct contact with the chemicals, and dispose of them properly according to local regulations.

Accuracy in measurements: Use calibrated and accurate measuring tools, such as graduated cylinders or burettes, to measure the amount of chalk, vinegar, and other reagents accurately. This will ensure the reliability and accuracy of the experimental results.

Observations: Make careful and detailed observations during the experiment, noting any changes in appearance, gas evolution, or other relevant observations. Take measurements at appropriate intervals and record the data accurately for analysis and interpretation.

It is important to follow good laboratory practices, including proper chemical handling, accurate measurements, and cautious observations, to ensure safe and reliable results in a chalk in vinegar chemistry lab experiment. Consult with a qualified instructor or supervisor for specific guidelines and precautions related to your experiment.

The mass of Na₃PO₄ formed during the reaction is 328 g.

The balanced chemical equation for the reaction is:

\(3NaOH + Na_3PO_4 - > 3Na_2PO_4 + H_2O\)

From the equation, we can see that 3 moles of NaOH produce 1 mole of Na₃PO₄.

Given that 2.0 moles of Na₃PO₄ is produced, we can set up a proportion to find the amount of NaOH required:

3 mol NaOH / 1 mol Na₃PO₄ = x mol NaOH / 2.0 mol Na3PO4

Solving for x, we get:

x = (3 mol NaOH / 1 mol Na₃PO₄) × (2.0 mol Na₃PO₄ / 1) = 6.0 mol NaOH

So, 6.0 moles of NaOH are required to produce 2.0 moles of Na₃PO₄.

To find the mass of Na₃PO₄ produced, we can use its molar mass:

mass = moles × molar mass = 2.0 mol × 164 g/mol = 328 g

Therefore, the mass of Na₃PO₄ formed during the reaction is 328 g.

learn more about limiting reactants here

https://brainly.com/question/26905271

#SPJ1

Answer: Industrial processes including mining and manufacturing historically have been leading causes of soil pollution. Industrial areas typically have much higher levels of trace elements and organic contaminants. This is due to intentional and unintentional releases from industrial processes directly into the environment, including to the soil, adjacent water bodies, and the atmosphere.

Explanation:

Answer:

NO3-

Explanation:

edge2020

no3-Edg 2020

Explanation

Brainliest

Based on the given reaction, the acid-base pairs in this reaction are:

An acid-base pair refers to a set of two chemical species that are related through the transfer of a proton (H+ ion) during a chemical reaction.

One species acts as an acid by donating a proton, while the other acts as a base by accepting that proton.

In the given reaction:

HCO₃⁻ (aq) + NH₃ (aq) → NH₄⁺ + CO₃²⁻

An acid-base pair can be identified as follows:

HCO₃⁻ (bicarbonate ion) can act as an acid by donating a proton (H⁺), becoming CO₃⁻.

NH₃ (ammonia) can act as a base by accepting a proton (H⁺), becoming NH₄⁺ (ammonium ion).

Learn more about acid-base pairs at: https://brainly.com/question/22514615

#SPJ1

Answer: Silicon

Explanation:

For something to have 4 valence electrons, it must be in the 14th column, which elimates gallium and argon for the possible answers. For somethign to have 3 electron shells, it must be in the third row of the periodic table which means the answer is silicon.

Answer:

Gallium

Explanation:

I believe this is the answer if not then the only other option is boron but anyways the answer is Gallium

Answer:

D: lithosphere

The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

Learn more about natural resources here:

https://brainly.com/question/24514288

#SPJ1

Answer:

negative

the chage on hydroxide ions os negative

Answer:

D

Explanation:

The formula to find the density of an object is mass/volume. You know the mass in this problem is 112.8 grams, and the volume is 63 cm^3. Now you can plug this information into the density formula as 112.8/63, which is about 1.8. Now you just add the cm^3/g and you have your answer.

Answer:

you can use math wa, it helps

x = 10, y = 20/6

Given

one number is three times of the other

their arithmetic mean is 10

Required

The numbers

Solution

Suppose the numbers you are looking for are x and y, then :

x = 3y (equation 1)

The arithmetic mean : the average of values

(x+3y)/2=10

x+3y = 20 (equation 2)

Substitute equation 1 into equation 2

3y+3y=20

6y=20

y = 20/6

from equation 1 :

x= 3 x 20/6

x = 60/6

x = 10

This extremely high temperature indicates that under normal conditions, you do not need to worry about your car tire bursting from overheating as it is unlikely to reach such extreme temperatures.

To determine the temperature at which the tire will burst, we can use the ideal gas law equation:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Rearranging the equation to solve for temperature, we have:

T = PV / (nR)

Given that the pressure threshold for bursting is 1.4 x 10^3 kPa, the volume is 30 L, and the number of moles of air is 2.5 mol, we can substitute these values along with the ideal gas constant R = 8.314 J/(mol K) into the equation.

T = (1.4 x 10^3 kPa) * (30 L) / (2.5 mol * 8.314 J/(mol K))

Converting kPa to Pa and L to m^3, and simplifying the equation, we find:

T ≈ 20,993 K

This extremely high temperature indicates that under normal conditions, you do not need to worry about your car tire bursting from overheating as it is unlikely to reach such extreme temperatures.

For more question on temperatures

https://brainly.com/question/4735135

#SPJ8

Answer:

A. The balanced chemical equations of the given reactions are shown below:

1. 3Mg(OH)₂ + 2H₃AsO₄ → Mg₃(AsO₄)₂ + 6H₂O

2. NH₄NO₃ → N₂O + 2H₂O

3. AsCl₃ + 3H₂O → H₃AsO₃ + 3HCl

4. 2C₄H₁₀O₂ + 11O₂ → 8CO₂ + 10H₂O

B. Number of moles of Cl₂ needed to react with 3.44 moles of F₂ = 1.14 moles

C. mass of ClF₃ produced = 0.136 * 92.5 = 12.58 g

D. 130.0 g of Cl₂ will produce (130 * 92.5)/71 g of ClF₃ = 169.37 g of ClF₃

Explanation:

A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side.This in accordance with the law of conservation of mass which explains that when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants.

The balanced chemical equations of the given reactions are shown below:

1. 3Mg(OH)₂ + 2H₃AsO₄ → Mg₃(AsO₄)₂ + 6H₂O

2. NH₄NO₃ → N₂O + 2H₂O

3. AsCl₃ + 3H₂O → H₃AsO₃ + 3HCl

4. 2C₄H₁₀O₂ + 11O₂ → 8CO₂ + 10H₂O

B. The balanced equation of the reaction is: Cl₂ + 3F₂  → 2ClF₃

From the equation above, I mole of Cl₂ reacts with 3 moles of F₂

Number of moles of Cl₂ needed to react with 3.44 moles of F₂ will be = 1 * 3.44/3 = 1.14 moles

C. From the equation above,  3 moles of F₂ reacts to produce 2 moles of ClF₃

0.204 moles of F₂ will produce (2 * 0.204)/3 of ClF₃ = 0.136 moles of ClF₃

Molar mass of ClF₃ = 35.5 + 3 * 19 = 92.5 g/mol

mass of ClF₃ produced = number of moles * molar mass

mass of ClF₃ produced = 0.136 * 92.5 = 12.58 g

D. From the equation of reaction, 1 mole of Cl₂ produces 2 moles of ClF₃

molar mass of Cl₂ = 71 g/mol

71 g of Cl₂ produces 2 * 92.5 g of ClF₃

130.0 g of Cl₂ will produce (130 * 92.5)/71 g of ClF₃ = 169.37 g of ClF₃

Answer:

A logic bomb and a time bomb are both types of malicious software or code that are designed to cause harm to a computer system or network. Here's a brief explanation of each:

Logic Bomb:

A logic bomb is a piece of code or software that is intentionally inserted into a system to execute a malicious action when specific conditions are met. It remains dormant until triggered by a predefined event or circumstance, such as a specific date, time, or user action. Once triggered, the logic bomb may perform various harmful actions, such as deleting files, corrupting data, or disrupting system functionality. The purpose of a logic bomb is often to cause damage or to gain unauthorized access to a system.

Time Bomb:

A time bomb is similar to a logic bomb, but it is specifically designed to activate or execute its malicious payload at a certain date or time. It is usually programmed to remain undetected until the predetermined time arrives. The time bomb can be set to trigger after a specific time period or on a particular date, at which point it may carry out destructive actions. Time bombs can be used by attackers to target specific events or to coordinate an attack to occur simultaneously across multiple systems.

Both logic bombs and time bombs are considered forms of malicious code or malware and are used with malicious intent to disrupt, damage, or compromise computer systems or networks. They can be extremely harmful, and it is important to have strong security measures, such as antivirus software and regular system updates, to protect against such threats.

Explanation:

Answer:

it can last for 30 minutes

Explanation:

because it is very good at giving off heat, extothermal heat can last for quite a while.

While tumor marker test results can be useful, they are not conclusive. A low result does not imply that you do not have cancer or that you are in remission.

CA 15-3, for example, is raised in less than half of patients with early breast cancer and in more than 80% of those with metastatic breast cancer. Three tumor markers, cancer antigen 15-3 (CA 15-3), cancer antigen 27.29 (CA 27.29), and carcinoembryonic antigen (CEA), have been used in breast cancer care to help monitor metastatic breast cancer (advanced disease), but they have not been found to be useful in detecting a breast cancer recurrence or extending lives. If the level falls, the treatment is effective. If it rises, the cancer may be spreading.

Learn more about effective here-

https://brainly.com/question/27325201

#SPJ4