PREPARATION OF BASES​

Volume of Naoh solution required to titrate 21.45 ml of a 1.500 m h3po4 solution is 95.09 mL.

The Balanced reaction for the titration is,

H3PO4 + 3NaOH -------> Na3PO4 + 3H2O

Millimoles of H3PO4 = 21.45 x 1.500 = 32.175

According to balanced reaction H3PO4 and NaOH reacts in 1 : 3 ratio

H₃PO₄ is inorganic. It needs to have all three of its H atoms neutralized. Each H from H3PO4 requires one OH to be neutralized. NaOH will provide one OH ion per formula unit. It will therefore require three moles of NaOH to neutralize one mole of H3PO4.

So, 32.175 x 3 = 96.525 millimoles NaoH must be reacted

96.525 = Volume of Naoh solution required to titrate x 1.015

V = 95.09mL

Volume of NaOH required to titrate is 95.09 mL.

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The answer is: In a tightly closed container, in a cool, well-ventilated area. Hydrochloric acid is a strong acid that should be stored in a tightly closed container in a cool, well-ventilated area.

Hydrochloric acid (HCl) is a colorless, corrosive, and highly acidic aqueous solution. It is a very strong acid with a pH of 0 to 1, which indicates that it can dissolve metals and other substances quite easily. It is commonly used in a variety of industrial applications, such as leather production, food processing, and ore processing. It can be quite harmful if it comes into touch with skin, eyes, or other organs, so safety precautions should always be taken while handling it.

Hydrochloric acid is a highly corrosive and reactive chemical that should be kept in a tightly closed container in a cool, well-ventilated area. This is to ensure that the fumes generated by the acid do not build up in the area, as they can be harmful to human health. Moreover, hydrochloric acid should never be kept in a beaker or flask, as these containers can easily break or spill, causing injury to those nearby.

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Answer:

proteins

Explanation:

amino acids are the monomers that make up proteins. amino acids bond together to form dipeptides, polypeptide chains, and eventually proteins.

Answer:

−7.389056fo3+5.436564f

−l2o3+2l

Explanation:

2al+f(2.7182822)o3=al2o3+2f(2.718282)

Step 1: Add -al^2o^3 to both sides.

7.389056fo3+2al+−al2o3=al2o3+5.436564f+−al2o3

−al2o3+7.389056fo3+2al=5.436564f

Step 2: Add -7.389056fo^3 to both sides.

−al2o3+7.389056fo3+2al+−7.389056fo3=5.436564f+−7.389056fo3

−al2o3+0fo3+2al=−7.389056fo3+5.436564f

Step 3: Factor out variable a.

a(−l2o3+2l)=−7.389056fo3+5.436564f

Step 4: Divide both sides by -l^2o^3+2l.

a(−l2o3+2l)

−l2o3+2l

=

−7.389056fo3+5.436564f

−l2o3+2l

a=

−7.389056fo3+5.436564f

−l2o3+2l

They form a new compound with new properties from the original element.

The same components are always present in the same ratios in a compound. Compounds' characteristics differ, sometimes significantly, from the characteristics of the constituent . This is due to the fact that when elements in such a compound combine, a whole new substance with distinct features results.

A compound contains special characteristics that set it apart from the characteristics of its basic elements.

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Answer: 5 all of the above

Explanation:

A mutation can be a blessing or a curse. It can also have no effect on the person at all.

Hope this helps

As the water temperature increased, the copper sulfate crystals dissolved faster but there was little change for the powdered form.

Increasing the temperature of a solvent can increase the rate at which a solid dissolves. This is because an increase in temperature causes the solvent molecules to move more rapidly, which in turn increases their kinetic energy and ability to interact with the solute particles.

As a result, the solute particles are more likely to break free from their crystal lattice and become surrounded by the solvent molecules.

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Answer:

A given quantity of solute dissolves faster when it is ground into small particles because more surface area is exposed.

Explanation:

The more surface area of a solute that is exposed, the faster the solute will dissolve. Like sugar for an example, sugar cubes take longer to dissolve as compared to regular ground up sugar.

And I took the test and got this right!

Answer:

Pros: No vehicle emissions other than water vapor. Fuel economy equivalent to about twice that of gasoline vehicles. Hydrogen is abundant, and can be made from renewable energy. Cons: This space-age technology is expensive.

Answer:

The pros of hydrogen fuel cells are that they are very efficient, producing very little waste. They are also very stable, which makes them safe to use.

The cons of hydrogen fuel cells are that they can be expensive to produce and maintain, and they require a lot of energy to power them, meaning that they often aren't as efficient as they could be.

Despite these pros and cons, hydrogen fuel cells are still a very promising technology. With more research, attention, and development, they could be a powerful force in the fight against carbon emissions and global warming.

Answer:

Why do atoms have no overall electrical charge?

Because atoms (and by extension matter in general) are usually electrically neutral, and have equal number of positively charged and negatively charged particles. The sign convention between electrons and protons is entirely arbitrary.

Explanation:

Your welcome!! Have a good day ^^

The concept of energy balance refers to the equilibrium between the energy input into a system and the energy output from that system. It is based on the principle of conservation of energy, which states that energy cannot be created or destroyed but can only be transferred or transformed from one form to another.

In terms of human energy balance, it involves the energy intake from food and beverages (energy in) and the energy expenditure through basal metabolic rate, physical activity, and other bodily processes (energy out). When the energy intake matches the energy expenditure, there is an energy balance. However, when there is an imbalance, either an excess or deficit of energy, it can lead to weight gain or weight loss, respectively.

For example, if a person consumes 2000 calories (energy in) through their diet and expends 2000 calories (energy out) through their daily activities and bodily functions, they maintain an energy balance. This means that the energy intake is equal to the energy expenditure, and their weight remains stable.

On the other hand, if a person consumes 2500 calories (energy in) but only expends 2000 calories (energy out), there is a positive energy balance. The excess energy is stored in the body as fat, leading to weight gain over time.

Conversely, if a person consumes 1500 calories (energy in) but expends 2000 calories (energy out), there is a negative energy balance. The body needs to compensate for the energy deficit by utilizing stored energy reserves, such as fat, resulting in weight loss.

Support for the concept of energy balance comes from scientific studies on weight management and obesity. It has been shown that maintaining an energy balance is crucial for weight maintenance, while sustained positive or negative energy balances can lead to weight changes. Additionally, energy balance plays a role in various physiological processes, including metabolism, hormone regulation, and overall health.

By understanding and managing energy balance, individuals can make informed decisions regarding their diet, physical activity, and lifestyle to achieve and maintain a healthy weight and overall well-being.

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Answer:

kevin is right according to what i see

The electrode can be used in conjunction with a dissolved oxygen meter to monitor oxygen levels in real-time and to control the oxygen supply to the culture medium to optimize growth conditions.

The redox potential indicator that detects the presence or absence of oxygen in the culture medium is called

"oxygen-sensitive electrode.

A redox potential indicator that detects the presence or absence of oxygen in the culture medium is known as an oxygen-sensitive electrode. It measures the partial pressure of oxygen (pO2) in a sample by transforming it into an electrical signal. It is made up of a platinum cathode and a silver anode, and it can be used in both aqueous and non-aqueous solutions.An oxygen-sensitive electrode is useful in a variety of applications, including fermentation processes and cell culture, where the presence or absence of oxygen affects the metabolic activity of the organisms in question. The electrode can be used in conjunction with a dissolved oxygen meter to monitor oxygen levels in real-time and to control the oxygen supply to the culture medium to optimize growth conditions.

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Sister chromatids is the term for the chromosomes that are identical after DNA replication.

Sister chromatids are identical chromosomes that are created during the process of DNA replication. DNA replication is the process where a DNA strand is copied, creating a new strand. During this process, each chromosome is split in half, forming two identical halves.

These halves are known as sister chromatids and are held together by a centromere. Sister chromatids are attached to one another during the interphase stage of the cell cycle and are separated during the metaphase stage of the cell cycle.

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Each of your kidneys is made up of about a million filtering units called nephrons. Each nephron includes a filter, called the glomerulus, and a tubule. The nephrons work through a two-step process: the glomerulus filters your blood, and the tubule returns needed substances to your blood and removes wastes.

Each of your kidneys is made up of about a million filtering units called nephrons.

Each nephron includes a filter,

called the glomerulus, and a tubule. The nephrons work through a two-step process:

the glomerulus filters your blood,

and the tubule returns needed substances to your blood and removes wastes

Answer:

this is called acid base reaction

Answer:

add a substace devider

Explanation:

i forgot what it was called but there is a chemical that allows the substances to seperste and than you can test the substaces ph and what it is

Answer:

This is because Mendeleev arranged the elements in order of increasing relative atomic mass.

Explanation:

Dmitri Mendeleev is one of the scientists that contributed to the development of periodic table in chemistry. He was able to organise elements into rows according to their atomic mass and into columns based on chemical and physical properties. This is the main reason why his periodic table is still studied even though it has some defects which include:

--> Grouping of elements that are not similar chemically: For example Copper and Silver bear no resemblance with the alkali metals, but they have been placed together in the first group.

--> Position of isotopes: According to his periodic table: Isotopes of an element must be given separate places in the periodic table because they have different atomic masses.

--> Electronic arrangement of elements: It failed to explain the electronic arrangement of elements.

--> Separation of chemically similar elements:

Elements that are chemically similar such as Gold and Platinum have been placed in separate groups.

the net ionic equation for the formation of chromium (III) carbonate is:
2Cr³⁺ (aq) + 6CO₃²⁻ (aq) → Cr₂(CO₃)₃ (s)

The net ionic equation for the formation of chromium (III) carbonate via mixing aqueous chromium (III) sulfate and ammonium carbonate is:
2 Cr3+ (aq) + 3 CO32- (aq) → Cr2(CO3)3 (s)
This equation shows the ions that are actually involved in the reaction and excludes any spectator ions, which do not participate in the reaction. The insoluble product, chromium (III) carbonate, is shown as a solid (s) in the equation.
To find the net ionic equation for the formation of chromium (III) carbonate via mixing aqueous chromium (III) sulfate and ammonium carbonate, follow these steps:
1. Write the balanced molecular equation:
Cr₂(SO₄)₃ (aq) + 3(NH₄)₂CO₃ (aq) → Cr₂(CO₃)₃ (s) + 6NH₄₂SO₄ (aq)
2. Write the total ionic equation, showing all ions in their aqueous state:
2Cr³⁺ (aq) + 3SO₄²⁻ (aq) + 6NH₄⁺ (aq) + 6CO₃²⁻ (aq) → Cr₂(CO₃)₃ (s) + 6NH₄⁺ (aq) + 6SO₄²⁻ (aq)
3. Cancel out the spectator ions (ions that appear on both sides of the equation):
NH₄⁺ (aq) and SO₄²⁻ (aq) are spectator ions in this case.
4. Write the net ionic equation, leaving only the ions that are involved in the reaction:
2Cr³⁺ (aq) + 6CO₃²⁻ (aq) → Cr₂(CO₃)₃ (s)
So, the net ionic equation for the formation of chromium (III) carbonate is:
2Cr³⁺ (aq) + 6CO₃²⁻ (aq) → Cr₂(CO₃)₃ (s)

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Answer:

wait what?

Explanation:

brainliest pls

Answer:

0.742M is the concentration of ClO₃⁻

Explanation:

The AgClO₃ contains 1 mole of ClO₃⁻ per mole of compound, but Mn(ClO₃)₂ contains 2 moles of ClO₃⁻ per mole of compound.

The moles of AgClO₃ are:

0.967L * (0.367moles / L) = 0.355 moles AgClO₃ = 0.355 moles of ClO₃⁻

And of Mn(ClO₃)₂:

0.667L * (0.643moles / L) = 0.429 moles Mn(ClO₃) * 2 = 0.858 moles of ClO₃⁻

That means total moles of ClO₃⁻ are:

0.355 moles + 0.858 moles = 1.213 moles ClO₃⁻ that are in 0.967L + 0.667L = 1.634L.

The concentration is:

1.213 moles ClO₃⁻ / 1.634L =

Answer:

The element was one of the alkaline metals, the dull appearance comes from the metal reacting with oxygen and oxidizing its outer surface as alkaline are known for their enormous reaction with oxygen in the air and water.

Another ability of this group of elements is the ability to conduct electricity. And they are also easy to cut with a kitchen knife.

To calculate enthalpy change from Gibbs free energy, you can use the following equation:

    ΔH = ΔG + TΔS

Gibbs free energy is a thermodynamic property that is used to determine the amount of energy available to do work in a system. It is denoted by the symbol G and is defined as the difference between the enthalpy (H) and the product of the temperature (T) and entropy (S)

Gibbs free energy is a useful tool for predicting the direction of a chemical reaction and the spontaneity of a process. If the Gibbs free energy of a reaction is negative, the reaction is spontaneous and will proceed in the forward direction. If the Gibbs free energy of a reaction is positive, the reaction is non-spontaneous and will not proceed in the forward direction without the input of energy. If the Gibbs free energy of a reaction is zero, the reaction is at equilibrium and there is no net change in the system.

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if 25.4 g of LiOH reacts with 64.8 g of CO2, 9.54 g of H2O will be produced.

We can start by using the coefficients in the balanced equation to convert the number of moles of one substance to the number of moles of another substance.

Convert the masses of LiOH and CO2 to moles:

Determine the limiting reactant:

Since the ratio of the coefficients in the balanced equation is 2:1 for LiOH to CO2, we can see that the limiting reactant is LiOH. This means that we will run out of LiOH before CO2, so we will use the moles of LiOH to calculate the amount of H2O produced.

Calculate the number of moles of H2O produced using the balanced equation:

From the balanced equation, for every 2 moles of LiOH that react, 1 mole of H2O is produced. So, the number of moles of H2O produced is:

1.06 mol LiOH / 2 mol LiOH/mol H2O = 0.53 mol H2O

Convert the number of moles of H2O to mass:

Mass of H2O = 0.53 mol * (18.0 g/mol) = 9.54 g

So, if 25.4 g of LiOH reacts with 64.8 g of CO2, 9.54 g of H2O will be produced.

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The compound which contains  an alkaline earth metal and a halogen is CaCl₂.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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If I accidentally left my working stock in room temperature, there are a few steps that I would take in order to assess the damage and salvage the situation. First, I would check the expiration date of the stock to see if it was still viable before being exposed to room temperature. If it had expired, then there may not be much I could do to save it.

Assuming the stock was still viable, I would then inspect it for any signs of contamination or degradation.

If the stock had become contaminated or had started to degrade, then it would need to be discarded.
If the stock appeared to be still usable, I would then perform a series of tests to determine if it was still functional.

I would conduct a viability assay, such as a colony forming unit (CFU) assay or a growth curve analysis, to determine if the stock was still capable of growing and dividing.

If the stock was still functional, then I would use it for experiments as planned, but with the understanding that it may not perform as well as a freshly prepared batch.
To prevent this situation from happening in the future, I would take steps to label and store my stocks properly and to set reminders for myself to check on their status regularly.

It's always better to be safe than sorry when it comes to important reagents and stocks in the lab.

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Answer:

4H²O

Explanation: