Name at least 3 ways the Periodic Table is organized. *

Answer: 9.5

Explanation:

The moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.

It is defined as moles of solute in certain volume of Solvent.

The units of Molarity is mol/L or Molar(M)

Molarity = moles of solute /  Volume of Solvent

It is given that a 2.5 L , 3.8 M solution

Let n be the number of moles needed

M = n/V

Substituting the values in the equation

3.8 =  n /2.5

n = 3.8 * 2.5

n = 9.5 moles

Therefore the moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.

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Answer:

The answer is A

Explanation:

I checked on a temperature converter calculator.

Answer:

100 Kelvin, 0 degrees Celsius, 32 degrees Fahrenheit.

Explanation:

Answer:

chlorine gas and oxygen

Resistance is equal to 8 ohms according to ohm's law.

Explanation:

Ohm's law describes the relationship between the voltage, current and resistance.

Ohm's law states that current is directly proportional to voltage and inversely proportional to resistance.

According to Ohm's law V = I × R

The units of voltage are measured in volts, current in amperes, and resistance in ohms.

Given data : Voltage = 48 volts

                     Current = 6 Amps

Substituting given data in ohm's law

48 = 6 × R

R = 8 ohms

Therefore, resistance is equal to 8 ohms fro the given data.

Answer:

The protection of internal environment from the harms of fluctuations in external environment is termed as homeostasis.

Explanation:

Homeostasis is the central requirement in the maintenance of an organism, which compels the adaptations in the constant changing condition and contribute in evolutionary process.

Maintaining homeostasis is crucial for all organisms to regulate their internal environment, adapt to environmental changes, and ensure their survival. A loss of homeostasis can cause diseases and negatively impact an organism's health.

Maintaining homeostasis is essential for the survival and well-being of all organisms. Homeostasis refers to the ability of an organism to regulate its internal environment, irrespective of changes in external conditions. This function is carried out by a myriad of biological processes and systems; for example, thermoregulation helps maintain a constant body temperature, and osmoregulation helps control the water and ion concentrations.

Exhibiting a lack of homeostasis can lead to great physiological stress and might be detrimental to the organism's survival. For example, in humans, a deviation from homeostasis can cause diseases such as diabetes, where the body fails to regulate blood glucose levels.

In conclusion, maintaining homeostasis is fundamentally important as it assures that all organisms can adapt to environmental changes, ensuring their survival and continued growth and development.

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Answer:

Kingdom Fungi refers to the group of eukaryotic organisms like fungi, mushrooms, molds and yeasts.

Explanation:

The fungi kingdom is made up of eukaryotic organisms whose cell walls are made of chitin.

Next I will name some characteristics of these organisms:

Answer:

sorry but i need the ptsm because I only have ten

Explanation:

Answer:

Explanation:

Climate

Answer:

             5.77 L

Solution:

Data Given:

                Moles  =  n  =  0.24 mol

                Temperature  =  T  =  35 °C + 273  =  308 K

                 Pressure  =  P  =  1.05 atm

                 Volume  =  V  =  ?

Formula Used:

Let's assume that the hydrogen gas in balloon is acting as an Ideal gas, the according to Ideal Gas Equation,

                 P V  =  n R T

where;  R  =  Universal Gas Constant  =  0.082057 atm.L.mol⁻¹.K⁻¹

Solving Equation for V,

                 V  =  n R T / P

Putting Values,

                 V  =  (0.24 mol × 0.082057 atm.L.mol⁻¹.K⁻¹ × 308 K) ÷ 1.05 atm

                 V  = 5.77 L

Answer:

Explanation:

1. Get a pillow

2. Find a bed or a couch

3. Get a comfy blanket

4. SLEEP

Answer:

Compounds are substances made from atoms of different elements joined by chemical bonds. They can only be separated by a chemical reaction. ... A mixture is made by simply mixing together elements and compounds. No new chemical bonds are formed

compounds containing two elements

sodium chloride

zinc sulfide

aluminium oxide

compounds containing three elements

potassium nitrate

copper carbonate

Answer:

i.

Mixture are made up of element that are not chemically bonded. (eg. In the air, containing O2, H2, N2 but jot mized together)

Compounds are made up of 2 or more type of atoms that are chemically bonded. (e.g CO2, H20)

ii.

Compound containing 2 elements :

Compound containing 3 elements :

Answer:Flowing water creates energy that can be captured and turned into electricity. ... The most common type of hydroelectric power plant uses a dam on a river to store water in a reservoir. Water released from the reservoir flows through a turbine, spinning it, which in turn activates a generator to produce electricity.

Explanation:

Answer:6.022×1023 water molecules

Explanation:

The calculation shows that 3.5 moles of water contain 2.1077 x 10²⁴ molecules.

To answer the question, we need to use Avogadro's number, which is 6.022 x 10²³ molecules per mole.

Write the given quantity and the desired quantity.

Write the conversion factor using Avogadro's number.

Set up the dimensional analysis equation to cancel out units and solve:

There are 2.1077 x 10⁴ molecules in 3.5 moles of water.

Answer:

Gases

Explanation:

Answer:

gases

Explanation:

because gases have less particles then water and solids

Answer:

Explanation:

The translated question is:

What maximum amount of grams of potassium nitrate (V) can be dissolved in 300g of water at 90 °C

To answer the question you need to consultate the solubiity information for potassium nitrate (V), KNO₃.

The attached table contains the solutibility table for KNO₃ at different temperatures.

At 90ºC it is 203g / 100g water.

Then, to calculate the maximum amount of grams of potassium nitrate (V) that can be dissolved in 300g of water at 90 °C, just multiply by the amount of water:

Answer: Given equal masses, water will heat up less than wood if the same heat is added.

Answer:

The correct answer is c

Answer:

2.00 M

Explanation:

The concentration of a solution is given by

[tex]M=\frac{m}{V}[/tex]

where

m is the mass of solute

V is the volume of the solution

At the beginning, the solution has:

M = 6.00 M is the concentration

V = 100 mL = 0.1 L is the volume

So the mass of solute (HCl) is

[tex]m=MV=(6.00)(0.1)=0.6g[/tex]

Then, the HCL is diluted into a solution with volume of

V = 300 mL = 0.3 L

Therefore, the final concentration is:

[tex]M=\frac{m}{V}=\frac{0.6}{0.3}=2.00 M[/tex]

Answer:

The final concentration is 2 M

Explanation:

Dilution is the procedure to prepare a less concentrated solution from a more concentrated one. It consists of adding more solvent.

The amount of solute (the solute is the solid, liquid or gaseous substance that dissolves in the solvent to produce a homogeneous mixture known as a solution and is generally found in a smaller proportion) does not vary. The volume of the solvent varies, so that the concentration of the solute decreases, as the volume of the solution increases.

In summary, dilution is a procedure by which the concentration of a solution is decreased, generally with the addition of a diluent.

One way to calculate concentrations or volumes in dilutions is through the expression:

Ci * Vi = Cf * Vf

where

In this case:

Replacing:

6 M* 0.1 L= Cf*0.3 L

Solving:

[tex]Cf=\frac{6 M* 0.1 L}{0.3 L}[/tex]

Cf=2 M

The final concentration is 2 M

Answer:

electromagnetic radiation

Explanation:

I had a quiz abt it

Answer:

0.60 mol H₂

General Formula and Concepts:

Chemistry - Gas Laws

Ideal Gas Law: PV = nRT

Explanation:

Step 1: Define Variables

P = 1.4 atm

T = 430 K

R = 0.0821 (L · atm)/(mol · K)

V = 15.1 L

n = unknown

Step 2: Solve for n

Step 3: Check

We are given 2 sig figs as our lowest. Follow sig fig rules and round.

0.598816 mol H₂ ≈ 0.60 mol H₂

Final answer:

Approximately 0.268 moles of hydrogen gas are necessary to exert a pressure of 1.4 ATM at 430 K and occupy a volume of 15.1 L.

Explanation:

To calculate the amount of hydrogen gas necessary to exert a pressure of 1.4 ATM at 430 K and occupy a volume of 15.1 L, 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 the number of moles:

n = PV / RT

Substituting the given values:

n = (1.4 ATM) * (15.1 L) / (0.0821 L*ATM/(mol*K)) * (430 K)

Simplifying the equation yields:

n = 0.26796 mol

Therefore, approximately 0.268 moles of hydrogen gas are necessary to exert a pressure of 1.4 ATM at 430 K and occupy a volume of 15.1 L.

There is an increase in the frequency of particle collisions which leads to the increased rate of the reaction.

Explanation:

Hydrochloric acid reacts faster with the powdered zinc than with the equal mass of zinc strips.  

Since the surface area of the Zinc particle increases when it is powdered and has more active spots when compared to less number of active sites in Zinc strips and so the number of collision between the Zinc particles and the particles of Hydrochloric acid also increases and consequently the rate of the reaction also enhances.

So there is an increase in the frequency of particle collisions.

Answer:

7.875 grams

Explanation:

You multiply 175 g by .045

This gives you 7.875 grams of lactose

Final answer:

The mass of lactose present in 175 g of cow's milk, which contains 4.5% lactose by mass, is 7.875 grams.

Explanation:

Mass is a fundamental physical quantity that represents the amount of matter in an object. It is a scalar quantity, meaning it has magnitude but no direction. Mass is typically measured in units such as kilograms (kg) or grams (g). In classical mechanics, mass plays a crucial role in determining an object's inertia, which is its resistance to changes in motion.

To calculate the mass of lactose present in 175 g of cow's milk, which contains 4.5% lactose by mass, you can use the following formula:

Mass of lactose = (Percentage of lactose by mass) × (Total mass of the milk)

Mass of lactose = 0.045 × 175 g = 7.875 g

Therefore, the mass of lactose present in 175 g of milk is 7.875 grams.

This is an incomplete question, here is a complete question.

Phosphorus trifluoride is formed from its elements.

[tex]P_4(s)+6F_2(g)\rightarrow 4PF_3(g)[/tex]

How many grams of fluorine are needed to react with 6.20 g of phosphorus?

Answer : The mass of [tex]F_2[/tex] needed are, 11.4 grams.

Explanation : Given,

Mass of [tex]P_4[/tex] = 6.20 g

Molar mass of [tex]P_4[/tex] = 124 g/mol

Molar mass of [tex]F_2[/tex] = 38 g/mol

First we have to calculate the moles of [tex]P_4[/tex]

[tex]\text{Moles of }P_4=\frac{\text{Given mass }P_4}{\text{Molar mass }P_4}[/tex]

[tex]\text{Moles of }P_4=\frac{6.20g}{124g/mol}=0.05mol[/tex]

Now we have to calculate the moles of [tex]F_2[/tex]

The balanced chemical equation is:

[tex]P_4(s)+6F_2(g)\rightarrow 4PF_3(g)[/tex]

From the balanced reaction we conclude that

As, 1 mole of [tex]P_4[/tex] react with 6 moles of [tex]F_2[/tex]

So, 0.05 moles of [tex]P_4[/tex] react with [tex]0.05\times 6=0.30[/tex] moles of [tex]F_2[/tex]

Now we have to calculate the mass of [tex]F_2[/tex]

[tex]\text{ Mass of }F_2=\text{ Moles of }F_2\times \text{ Molar mass of }F_2[/tex]

[tex]\text{ Mass of }F_2=(0.30moles)\times (38g/mole)=11.4g[/tex]

Therefore, the mass of [tex]F_2[/tex] needed are, 11.4 grams.

The mass of F2  that should be required to react with 6.20 g should be 11.4 grams.

Since

Mass of P4 is 6.20g

The molar mass of P4 is 124 g/mol.

And, the molar mass of F2 is 38 g/mol.

Now the moles of P4 is

= Given mass / molar mass

= 6.20/124

= 0.05 mol

Now the moels of F2 is

= Moles of P4 * 6

= 0.05 * 6

= 0.30 moles

So, here the mass is

= Moles of F2 * molar mass of F2

= 0.30 * 38

= 11.4 grams

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Answer:

We will use ideal gas equation in this problem

PV = nRT

Where

P = pressure of gas or air = ?

V = volume of air = volume of pressure cooker = 5.68 L

T = temperature = 394 K

n = moles of air = 0.355

R = ideal gas equation = 0.0821 L atm / mol K

Putting values

Pressure = nRT / V = 0.355 X 0.0821 X 394 / 5.68 = 2.02 atm.

Final answer:

The statement that covalent compounds form crystals is TRUE in the context of covalent network crystals, such as diamond or quartz, but FALSE when referring to typical molecular compounds, which exist as discrete units but can also form molecular crystals held by weaker forces.

Explanation:

The statement 'Covalent compounds form structures called crystals' can be both TRUE and FALSE depending on the context. Unlike ionic compounds, which are known for their crystal lattice structures, molecules of covalent compounds typically exist as discrete units. However, there are also covalent network crystals, such as diamond and quartz, where atoms are covalently bonded in a continuous three-dimensional network, forming a crystalline structure. Additionally, there are molecular crystals that do not form a covalent network but are held together by weaker intermolecular forces.

Atoms arrange themselves into lattices to form a crystal because of a net attractive force between their constituent electrons and atomic nuclei. These crystalline structures are categorized into ionic, covalent, and metallic, based on their bonding. It's important to distinguish between molecular crystals and covalent network crystals when discussing covalent compounds in crystal structures.

The relative energies and forces that hold crystals together are case-dependent, with factors like ionic sizes and stoichiometries influencing the structure of ionic crystals. Covalent network crystals have very high melting and boiling points, are hard and brittle, and do not conduct electricity because they are composed of atoms, not ions.

Answer:False

Explanation:

It’s false

Answer:keep feet dry, avoid sharing things, wear cotton socks. That’s all

Answer:

c

Explanation:

got it right on assignment

Final answer:

A net ionic equation reflects only the participating ions in a chemical reaction, omitting the spectators. For HCl reacting with NaOH, it is H+(aq) + OH−(aq) → H₂O(l). For AgNO₃ reacting with NaCl, it is Ag+(aq) + Cl−(aq) → AgCl(s).

Explanation:

What is a Net Ionic Equation?

The net ionic equation shows the chemical equation that includes only the reacting ions in a solution and omits the spectator ions. Spectator ions are those that do not participate directly in the chemical reaction and which remain in the solution unchanged. This simplification helps to focus on the actual chemical change taking place. For example, if we consider the reaction of hydrochloric acid (HCl) with sodium hydroxide (NaOH), we start with the complete ionic equation:

H+(aq) + Cl−(aq) +Na+(aq) + OH−(aq) → H₂O(l) + Na+(aq) + Cl−(aq)

In this reaction, sodium ions (Na+) and chloride ions (Cl−) are spectator ions, as they do not change during the reaction. We can remove them to obtain the net ionic equation, which demonstrates the actual chemical change:

H+(aq) + OH−(aq) → H₂O(l)

Similarly, if we were to use a different example such as the precipitation reaction between silver nitrate (AgNO₃) and sodium chloride (NaCl), the net ionic equation would be:

Ag+(aq) + Cl−(aq) → AgCl(s)

This representation highlights the formation of silver chloride precipitate from the reacting ions, omitting the spectator sodium (Na+) and nitrate (NO₃−) ions.

Answer:

D

Explanation:

the stuff being dissolved when making a solution

it is dissolved in the solvent

Answer:

1.00658 atm

Explanation:

765 torr is equal to 1.0079 atm using the conversion factor:  1 atm = 760 torr.

Pressure can be measured in various units depending on the system of measurement being used. Some common units of pressure include:

Each unit of pressure has its specific conversion factors to other units. For example, 1 atm is approximately equal to 101.325 kPa or 760 mmHg. It's essential to use the appropriate unit for the specific application and to ensure consistency when comparing or converting pressure measurements.

The conversion factor:

1 atm = 760 torr.

765 torr ÷ 760 torr/atm = 1.0079 atm

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Answer:

475.26°C

Explanation:

Given parameters:

Mass of object = 50g

Specific heat  = 0.3825J/g°C

Quantity of heat  = 4593Joules

Initial temperature  = 235.16°C

Unknown:

Final temperature = ?

Solution:

The quantity of heat absorbed by a body is a function of the mass, specific heat capacity and temperature change the body undergoes.

Mathematically, this relationship is given as;

              H  = m c Ф

where H is the quantity of heat

           m is the mass of the body

            c is the specific heat capacity

            Ф is the temperature difference

Ф  = final temperature - initial temperature

  Since we are solving for final temperature, let us substitute for other given parameters;

    H  =  m c ( final temperature - initial temperature)

       4593  = 50 x 0.3825 x (F  - 235.16)

       F - 235.16  = 240.1

             F  = 240.1 + 235.16 = 475.26°C