a 90 g samole of naoh is dissolved in water and the solution is diluted to give a final volume of 3 liters the moarity of the final solution is

Answer:

there are used to where large volumes are needed to be transferred and coloured graduated marks make it easier to measure the volumes. the disadvantage isthat they are not so precise and there are greater changes of human error

Answer:

i think their is amswer key for that

Explanation:

SOMEONE ANSWER DA QUESTON

Answer:

A. 7

(assuming the water is neutral)

State 3: particles are locked in place describes the solid state exactly.

The physical characteristics of matter in which molecules or atoms are unable to move freely and are instead required to maintain their borders independently and in fixed connection to one another.

One of the four basic states of matter is solid.

The least energy molecules are those that form solids and are tightly grouped.

The solid's defining structural rigidity and resistance to external pressure.

Solids have precise mass, volume, and shape as well as compact arrangements of their constituent particles. Between molecules, there is not much intermolecular space.

Therefore, State 3: particles are locked in place describes the solid state exactly.

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The heat energy needed to heat the water in the pot to boiling is approximately 753,600 J.

To determine the heat energy needed to heat the water in the pot to boiling, we can use the formula:

Q = m * c * ΔT

Where:

Q is the heat energy (in joules),

m is the mass of the water (in grams),

c is the specific heat of water (in J/(g˚C)),

ΔT is the change in temperature (in ˚C).

Given:

Mass of water (m) = 2400g

Specific heat of water (c) = 4.18 J/(g˚C)

Change in temperature (ΔT) = 100˚C - 25˚C = 75˚C

Plugging these values into the formula, we have:

Q = 2400g * 4.18 J/(g˚C) * 75˚C

= 753,600 J

Therefore, the heat energy needed to heat the water in the pot to boiling is approximately 753,600 J.

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Answer:

ice absorbs heat from water.

Explanation:

Heat is a measure of molecular activity: the faster a thing's molecules move, the more heat that substance contains. And because everything is made of molecules, and molecules are in constant motion, everything contains at least some heat.

Because ice molecules move slowly and cluster tightly together, they produce a relatively low amount of heat. When ice is placed in a glass of water whose molecules are moving at a greater rate, the ice begins to absorb energy, because heat always travels from regions of relative warmth to colder areas in order to equalize temperatures. In other words, ice absorbs heat from the water.

As the water molecules lose energy, they begin to slow down, and consequently cool. So, it's kind of the opposite of what you might think: when we put ice in water, the ice doesn't give its cold to the water, it takes heat from the water.

Answer: The scientific reasons for going to Mars can be summarised by the search for life, understanding the surface and the planet's evolution, and preparing for future human exploration. Understanding whether life existed elsewhere in the Universe beyond Earth is a fundamental question of humankind.

Explanation:

Number of copper atoms ≈ 3.013 x 10²³ atoms

To determine the number of copper atoms in a given volume, we need to follow these steps:

Determine the mass of the copper sample:

Mass = Volume x Density

Given that the density of copper is 8.96 g/cm³, we can assume the volume as 1 cm³ for simplicity.

Mass = 1 cm³ x 8.96 g/cm³ = 8.96 g

Calculate the number of moles of copper using the molar mass of copper:

Molar mass of copper (Cu) = 63.55 g/mol

Moles of copper = Mass / Molar mass

Moles of copper = 8.96 g / 63.55 g/mol

Determine the number of copper atoms using Avogadro's number:

Avogadro's number (NA) = 6.022 x 10²³  atoms/mol

Number of copper atoms = Moles of copper x NA

Number of copper atoms = [(4/3)π cm³ x 8.96 g/cm³] / 63.55 g/mol x (6.022 x 10²³  atoms/mol)

By substituting the values and performing the calculations:

Number of copper atoms ≈ 3.013 x 10²³ atoms

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Answer:

100 grams of C-14 decays to 25 grams in 11,460 years.

The C-14 isotope is only useful for dating fossils up to about 50,000 years old

If an ancient bone contains 6.25% of its original carbon, then the bone must be 22,920 years old.

Explanation:

We already know that the half life of C-14 is 5,730 years. After the first half life, we have 50 grams remaining. This takes 5,730 years. After the second half life (11,460 years now gone) we have 25 grams of C-14  left.

If a fossil material is  older than 50,000 years an undetectable amount of 14C is left in the sample hence Carbon-14 is no longer suitable for dating the sample.

From;

0.693/5730 = 2.303/t log (No/0.0625No)

Where;

t = time taken and No = initial amount of C-14

0.693/5730= 2.77/t

t = 22,920 years

The proper handling and storage of medications is crucial to maintain their efficacy and prevent contamination or other adverse effects.

To determine the number of vials of Bacitracin needed, we can divide the total number of units required by the amount of units per vial:

100,000 units / 25,000 units per vial = 4 vials

Therefore, Dr. Rivera will need 4 vials of Bacitracin for irrigation of the surgical wound.

It's important to note that while 4 vials may be sufficient for this particular order, it's always best to confirm dosages and quantities with a healthcare professional to ensure safe and effective treatment.

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Answer:

1. H=2, O=1

2. H=4, O=2

3. C=1, O=1

4.

a. reactants C=1, O=2

b. products C=1, O=2

5.

a. reactants H=4, O=2

b. products H=4, O=2

6

a. reactants C=1, O=1, H=4

b. products C=1, O=1, H=4

Answer:

Answer: A.HCI

Explanation:

The saturated vapor pressure of methanol in the vessel is 125.9 mmHg (rounded off to 3 significant figures). The volume percent concentration of methanol in the vapor is 73.2% (rounded off to 3 significant figures).

a. Saturated vapor pressure of methanol in the vessel in mmHg: The vapor pressure of methanol (MeOH) in the vessel can be determined using Dalton's law of partial pressures. MetOH psat = MetOH Pabs

Here, MetOH Pabs is the pressure exerted by the vapor of methanol in the vessel. It is equal to the total pressure in the vessel minus the partial pressure of the inert gas (nitrogen). Pabs = 2 inch of water gauge = 2 x 25.4 mm of water gauge / 1 inch of water gauge = 50.8 mm of water gauge

Total pressure in mmHg = Pabs x 760 mmHg / 406.8 inch of water gauge = 94.8 mmHg

Partial pressure of nitrogen = 2 inch of water gauge = 50.8 mm of water gauge

Partial pressure of methanol = MetOH Pabs MetOH psat = 126 mmHg (at 25°C)

Therefore, the saturated vapor pressure of methanol in the vessel is 125.9 mmHg (rounded off to 3 significant figures).

b. Volume percent concentration of methanol in the vapor: The volume percent concentration of methanol in the vapor can be determined using the ideal gas law and the Dalton's law of partial pressures. V = nRT / PV = volume of the vapor (L)n = number of moles of methanol gas R = gas constant T = temperature (K)P = pressure (atm)

Let's assume that the total volume of the vapor in the vessel is 1 L and the temperature is 25°C (298 K).

The number of moles of nitrogen gas (N2) in the vapor can be determined using the Dalton's law of partial pressures. N2 Pabs = Pabs - MetOH PabsN2 Pabs = 50.8 mm of water gaugeN2 Pabs = 50.8 mm of water gauge x 1 atm / 760 mmHg = 0.067 atmN2 V = nRT / PN2N2 V = (0.067 atm x 1 L) / (0.082 L atm/K mol x 298 K)N2 V = 0.0022 mol

The number of moles of methanol gas (MeOH) in the vapor can be determined using the ideal gas law. MetOH Pabs = MetOH psatMetOH Pabs = 125.9 mm Hg MetOH Pabs = 125.9 mmHg x 1 atm / 760 mmHg = 0.165 atmMetOH V = nRT / PMetOH V = (0.165 atm x 1 L) / (0.082 L atm/K mol x 298 K)MetOH V = 0.006 mol

The volume percent concentration of methanol in the vapor can be determined using the following equation.

Volume percent concentration of MeOH = MetOH V / (N2 V + MetOH V) x 100%

Volume percent concentration of MeOH = 0.006 mol / (0.0022 mol + 0.006 mol) x 100%

Therefore, the volume percent concentration of methanol in the vapor is 73.2% (rounded off to 3 significant figures).

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Answer:

Solution,

Reciprocal of 6/11=11/6

Now,

-1/5+11/6

=-1*6+11*5/30

=-6+55/30

=49/30

Hope it helps

Good luck on your assignment

Answer: The amount of CO2 found in the atmosphere varies over the course of a year. Much of this variation happens because of the role of plants in the carbon cycle

Answer:

Every System has an IPO: Input, Process, Output. When you look at any system, in its simplest form, it has 3 components. It's what I'll call IPO: Input, Process, Output. Input – anything you do to activate the system or give the system to use.

Explanation:

The electron domain geometry of the following molecules are BrCl5 is square pyramidal, BCl3 is trigonal planar, and PH3 is tetrahedral.


The electron domain geometry of BrCl5 is square pyramidal. This is because there are 5 bonding pairs of electrons around the central atom, Br, and 1 lone pair of electrons. The 5 bonding pairs of electrons are arranged in a trigonal bipyramidal shape, with the lone pair of electrons occupying one of the equatorial positions. This results in a square pyramidal shape.


The electron domain geometry of BCl3 is trigonal planar. This is because there are 3 bonding pairs of electrons around the central atom, B, and no lone pairs of electrons. The 3 bonding pairs of electrons are arranged in a trigonal planar shape.

The electron domain geometry of PH3 is tetrahedral. This is because there are 3 bonding pairs of electrons around the central atom, P, and 1 lone pair of electrons. The 3 bonding pairs of electrons are arranged in a trigonal planar shape, with the lone pair of electrons occupying one of the tetrahedral positions. This results in a tetrahedral shape.

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In the process of hydrogenating fat, the carbon atoms in the molecule are added.

what is fat hydrogenation?

In order to transform some or all of the unsaturated fat into saturated fat and create a solid or semi-solid fat, fat is normally liquid vegetable oils that are combined with hydrogen.

Vegetable oil is hydrogenated by heating a mixture of vegetable oil and a metal catalyst—typically nickel—in a near-vacuum environment to extremely high temperatures and then adding hydrogen. The oil's carbon atoms lose their double bonds with other carbons as a result. The double bond between carbon atoms can no longer exist since each carbon atom is single-bonded to a distinct hydrogen atom.

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Answer:

Cut Down On Waste. One of the simplest ways you can reduce your impact on the planet is by cutting down on waste. ...

Support Sustainable Companies. ...

Limit Your Meat Intake. ...

Reduce Energy and Water Use. ...

Offset Your Carbon Emissions. ...

Re-purpose, Recycle, and Borrow.

Explanation:

Plz mark brainliest thanks

Oxygen is limiting reactant to produce water in the given balanced equation.

Reactants in a chemical reaction are referred to as excess reagents if they are still present at the end of the reaction. The reactant that is consumed first in a chemical reaction, also known as the limiting reactant (or limiting reagent), limits the amount of product that can be produced.

Mass of oxygen ... 64g

Molar mass .... 32g

No. of moles will be mass/molar mass i.e. 64/34 .... 2 moles

From , CH4 + 2O2 → CO2 + 2H2O

1 mole of Methane reacts wit 2 moles of Oxygen to give 1 mole of CO2 and 2 moles of water.

Mass of Methane gas present is 36g

Molar mass is 1g

Required mass of Methane will be 1*16 i.e. 16g only.

So Methane is in excess.

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Here is the sorted list:

Activators:

- Insulin

- Protein phosphatase 1

Inhibitors:

- Epinephrine

- Glycogen synthase kinase 3

- Protein kinase A (PKA)

- Glucagon

Insulin is a hormone produced by the pancreas that plays a crucial role in regulating blood sugar levels. It allows cells in the body to take in glucose (sugar) from the bloodstream and use it as a source of energy. Insulin also helps store excess glucose in the liver for later use.

In individuals with diabetes, the production or effectiveness of insulin is impaired, leading to high blood sugar levels. There are two main types of diabetes:

1. Type 1 diabetes: This occurs when the pancreas fails to produce enough insulin. It is typically diagnosed in childhood or early adulthood and requires lifelong insulin therapy.

2. Type 2 diabetes: In this condition, the body either doesn't produce enough insulin or becomes resistant to its effects. It is often associated with lifestyle factors such as obesity, physical inactivity, and poor diet. Initially, type 2 diabetes can often be managed through lifestyle changes, such as diet and exercise, but some individuals may eventually require insulin or other medications to control their blood sugar levels.

Insulin can be administered through injections using syringes, insulin pens, or insulin pumps. The dosage and frequency of insulin administration depend on various factors, including the individual's blood sugar levels, lifestyle, and type of diabetes. Insulin types can vary in their onset, peak action, and duration, allowing for different treatment regimens tailored to each person's needs.

It's important for individuals with diabetes to monitor their blood sugar levels regularly, follow their healthcare provider's recommendations for insulin dosage and administration, and make necessary lifestyle adjustments to manage their condition effectively.

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The balanced chemical equation for the reaction between solid lithium oxide (Li2O) and liquid water (H2O) to form aqueous lithium hydroxide (LiOH) is: Li2O(s) + H2O(l) → 2LiOH(aq)

In the balanced chemical equation, the reactants are solid lithium oxide (Li2O) and liquid water (H2O), while the product is aqueous lithium hydroxide (LiOH). The phase of each substance is indicated in the equation as follows: Li2O is in the solid phase (s), H2O is in the liquid phase (l), and LiOH is in the aqueous phase (aq). The equation shows that two moles of LiOH are produced for every mole of Li2O reacted with water. This reaction represents the combination of the elements lithium, oxygen, and hydrogen to form lithium hydroxide.

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Answer:

Explanation:

aha I finally found the answer

The relative rates of diffusion of the gasses is √2 from the calculation.

The rate of diffusion refers to the speed at which particles or molecules spread or disperse through a medium from an area of higher concentration to an area of lower concentration.

We know that from the Graham's law, we have that;

\(R_{1}\)/\(R_{2}\) = √\(M_{2}\)/\(M_{1}\)

\(R_{1}\)= rate of diffusion of Ne

\(R_{2}\)  = rate of diffusion pf carbon dioxide

\(M_{2}\)= molar mass of carbon dioxide

\(M_{1}\) = molar mass of Ne

Then;

\(R_{1}\)/\(R_{2}\) = √44/22

\(R_{1}\)/\(R_{2}\) =  The relative rates of diffusion of the gasses is √2

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Answer:

number of protons and neutrons

Explanation: