What does L represent? When did it form?

Answer:

2000 years

Explanation:

A radioactive molecule will continuously decay and turn into another molecule. This nature of the radioactive molecule makes them can be used to estimate the age of an object. Half-life is the unit of time needed for radioactive molecules to decay to half of its mass. The formula for the mass remaining will be:

[tex]N(t)= N_{0} (\frac{1}{2})^{\frac{t}{t_{1/2} } }[/tex]

Where

N(t)= number of the molecule remains

N0= number of molecule initially

t= time elapsed

t1/2= half time

We have all variable besides the half time, the calculation will be:

[tex]N(t)= N_{0} (\frac{1}{2})^{\frac{t}{t_{1/2} } }[/tex]

[tex]0.125= 1 (\frac{1}{2})^{\frac{6000}{t_{1/2} } }[/tex]

[tex](\frac{1}{8})= (\frac{1}{2})^{\frac{6000}{t_{1/2} } }[/tex]

[tex](\frac{1}{2})^3= (\frac{1}{2})^{\frac{6000}{t_{1/2} } }[/tex]

3= 6000/ (t1/2)

t1/2= 6000/3= 2000

The half-life is 2000 years

Answer:

Increase the turns of the wire

Explanation:

By increasing the number of turns the wire has made, you are increase the inductive power of the coil in the generator, thereby giving rise to the output of the generator.

The volume of 2.0 moles of nitrogen at 0.947 atm and 20° C is obtained by using the ideal gas law PV = nRT and rearranging to solve for V with appropriate unit conversions for temperature.

To calculate the volume that 2.0 moles of nitrogen will occupy at 0.947 atm and 20° C, we can use the ideal gas law, which is PV = nRT, where P is the pressure in atmospheres (atm), V is the volume in liters (L), n is the number of moles of gas, R is the ideal gas constant (0.0821 L·atm/K·mol), and T is the temperature in Kelvin (K). To solve for V, we first convert 20° C to Kelvin by adding 273.15, resulting in 293.15 K. We then rearrange the ideal gas law to solve for V: V = (nRT)/P . Substituting in the values, we get:

V = (2.0 moles x 0.0821 L·atm/K·mol x 293.15 K) / 0.947 atm

After performing the calculations, we find the volume occupied by the nitrogen gas.

Answer:

its lavered structure

Explanation:

Final answer:

The atmosphere acts as a system in how it manifests global wind patterns which are influenced by atmospheric pressure gradients, the rotation of the Earth, and thermal energy. The Coriolis effect and thermal activity generate geographically significant wind patterns like the trade winds. Global warming may induce alterations in these patterns.

Explanation:

Global Wind Patterns as an Atmospheric System

The earth's atmosphere behaves as a dynamic system, particularly evident through global wind patterns. These patterns are driven by complexities such as atmospheric pressure gradients, the rotation of the Earth, and thermal energy from the Sun. The resulting movement of air in response to these factors is what we call 'wind.'

For instance, in the northern hemisphere, air moves into a low-pressure region and is deflected to the right due to the Coriolis force, creating counterclockwise circulation. On the other hand, air moving away from high-pressure areas is deflected in a rightward motion as well, but this results in a clockwise circulation. The combination of rising and sinking air due to thermal activity and the Coriolis effect generates trade winds, which are essential in the global transfer of heat and moisture, impacting global climate and weather systems.

Additionally, global warming could significantly alter these atmospheric circulation patterns, potentially leading to changes in weather systems, like the distribution of precipitation and the intensity and frequency of storms.

Hey there!

A half-life means after a certain amount of time, half of that substance will be gone/changed after that time.

There are two half lives in 20 years because 20 ÷ 10 = 2.

So, we divide the 100g sample in half 2 times.

100 ÷ 2 = 50

50 ÷ 2 = 25

There will be 25g of the radioactive sample remaining after two half lives.

Hope this helps!

Answer:

This is a popular question because it is important. You have 2 Major kinds of substances, or compounds, ionic, and covalent. Covalent compounds usually do not “break apart” in solution, (in fact you have to try and find the right ones to do this), BUT, the IONIC compounds, like salts, held together by their opposite charges do tend to separate in solution.

Take NaCl, sodium chloride. Add waster, and you get Na+ and Cl-. Now if we add methanol, a poisonous alcohol, it simply remains together as it is diluted in water. It is a Covalent compound, where all of the atoms of CH3OH share their electrons, which is very different than being held together by opposite charges.

Explanation:

Final answer:

Ionic compounds create more solute particles in a solution compared to covalent compounds, as they dissociate into individual ions, resulting in a greater effect on colligative properties.

Explanation:

When comparing whether ionic compounds or covalent compounds create more solute particles in a solution, it is important to understand how each type of compound dissolves. Ionic compounds, when dissolved, dissociate into their constituent ions. For example, NaCl separates into Na+ ions and Cl- ions, doubling the number of particles in solution. On the other hand, covalent compounds, such as glucose, do not dissociate but rather separate into individual molecules in solution. Therefore, ionic compounds generally produce a larger number of dissolved particles and have a greater effect on colligative properties such as boiling point and freezing point of the solution.

Colligative properties are directly related to the number of solute particles in a solution. Since ionic compounds provide more solute particles due to dissociation, they significantly alter colligative properties compared to an equal amount of moles of a covalent compound. This is a crucial concept when analyzing the impact of different solutes on solutions.

Answer:

The new pressure is 1,65 atm

Explanation:

We use the gas formula, which results from the combination of the Boyle, Charles and Gay-Lussac laws. According to which at a constant mass, temperature, pressure and volume vary, keeping constant PV / T.

(P1xV1)/T1= (P2xV2)/T2

(1,23atmx 8,46L)/267 K = (P2 x 6,98L)/ 295K

0,039 atmx L/K = (P2 x 6,98L)/ 295K

P2=(0,039 atmx L/K)x 295K/6,98L =1,65 atm

Answer:

or all desendants of a common ancestor

2. A period is a name given to the horizontal row of the periodic table.

3.

a.mg

b.k

c.Fe

d.cu

e.Al

4.

a.Carbon

b.Chlorine

c.Gold

d.strontium

5.

a.period 1

b.period 4

c.period 5

d.period 5

6.

a.group 6

b.group 2

c.group 7

d.group 8 belong ti 1st transitional elements.

7.

a.F

b.Na

c.Ar

d.V

e.I

This answer provides definitions for chemical families (groups) and periods, symbol and name identification for a number of elements, their period and group placements within the Periodic Table, and examples of atoms of different types.

1. In chemistry, a Family is a column of elements in the Periodic Table. They are also known as Groups and share similar chemical behavior.

2. A period in the Periodic Table is a horizontal row of elements. Each new row (or Period) signifies a new energy level in the atom's electrons.

3. The symbols for the elements are:
a. Magnesium - Mg
b. Potassium - K
c. Iron - Fe
d. Copper - Cu
e. Aluminum - Al

4. The names of the elements:
a. C - Carbon
b. Cl - Chlorine
c. Au - Gold
d. Sr - Strontium

5. The periods for the elements:
a. He (Helium) - Period 1
b. Ge (Germanium) - Period 4
c. Rb (Rubidium) - Period 5
d. I (Iodine) - Period 5

6. The groups for the elements:
a. Sulfur - Group 16
b. Ca (Calcium) - Group 2
c. Iodine - Group 17
d. Fe (Iron) - Group 8 (In the transition metals)

7. Examples of atoms based on characteristics:
a. Halogen - Fluorine(F)
b. Alkali metal - Sodium(Na)
c. Noble gas - Neon(Ne)
d. Transition metal - Iron(Fe)
e. Nonmetal - Oxygen(O)

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Moles of CO₂ produced will be 4.5

Explanation:

CH₄ + 2O₂ → CO₂ + 2H₂O

Molecular weight of CH₄, M = 16

given mass of CH₄, m = 72

moles of CH₄, n = given mass / molecular mass

[tex]n = \frac{m}{M} \\\\n = \frac{72}{16} \\\\n = 4.5[/tex]

Therefore, number of moles of CH₄ present is 4.5

According to the balanced equation,

1 mole of CH₄ produces 1 mole of CO₂

4.5 moles of CH₄ will produce 4.5 moles of CO₂

Therefore, moles of CO₂ produced will be 4.5

Answer:

They expressed it as rate of change in concentration of reactants or products in a chemical reaction

The rate of a chemical reaction can be expressed in the terms of the increase in the concentration of product or decrease in the concentration of reactants with time.

The rate of reaction can be defined as the speed at which the products are formed from the reactants in the reaction. The rate of the chemical reaction offers information on how much the time reaction will be completed.

The rate of reaction can be defined as the speed of a reaction at which reactants are transformed into products. Some reactions are instantaneous, while some reactions take time to reach the final equilibrium.

A catalyst can be defined as a substance that enhances the rate of the reaction without going under any change in the reaction.  

Rates of reaction are expressed as the concentration of reactant used or the concentration of product produced per unit of time. The units of rates are mol per liter or mol/L.

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Answer:

Ecosystem :

Any living organism interacting with its physical environment by any means is known as Ecosystem.

Ecology :

Ecology is the study of the ecosystem. In this field of biology, we study how an organism interact with its physical environment and how the environment respond.

Answer:

Hg(NO₃)₂(aq) + Na₂SO₄(aq)   →   2NaNO₃(aq) + HgSO₄(s)

Moles of Hg(NO₃)₂ = 55.42 / 324.7 ==> 0.1707 moles

Moles of Na₂SO₄ = 16.642 / 142.04 ==> 0.1172 moles

Limiting reagent is Na₂SO₄ as it controls product formation

Moles of HgSO₄ formed = 0.1172 moles

                                        = 0.1172 x 296.65

                                        = 34.757g

Explanation:

Answer:

Coefficient's are 2, 2, 1

Explanation:

We are given;

Unbalanced equation;

H₂O₂ → H₂O + O₂

We are required to determine the suitable coefficients that would balance the equation.

In this case;

To balance the equation we put the coefficients 2, 2, 1 respectively

Therefore;

The balanced equation is;

2H₂O₂ → 2H₂O + O₂

Thus, Suitable coefficients are, 2, 2, 1

Answer:

The answer is B)2,2,1

Explanation:

I just got it right on USA test prep

Answer:

C3H7COOCH3 + H2O/H^+ --------> C3H7COOH + CH3OH

Explanation:

The acid hydrolysis of methyl butanoate is formed by the addition of water and thereby breaking Ester bond to form an alcohol and a carboxylic acid.

C3H7COOCH3 + H2O/H^+--------> C3H7COOH + CH3OH

Answer:

Atom are single neutral particles.Molecule are neutral particles made of two or more atom bonded together.

One mole of Ca equals approximately 6.022 x [tex]10^2^3[/tex] atoms, which is the value of Avogadro's number.

One mole of an element is defined as having the same number of atoms as there are in 12 grams of the 12C isotope of carbon. This number is known as Avogadro's number, and it is approximately 6.022 x [tex]10^2^3[/tex] particles. In the case of calcium (Ca), one mole of Ca would equal to roughly 6.022 x [tex]10^2^3[/tex] calcium atoms.

The concept of the mole is fundamental in chemistry for quantifying the amount of substance. Whenever we mention one mole of any element, we are referring to 6.022 x [tex]10^2^3[/tex] atoms of that element, whether it's carbon, calcium, or any other element.

Answer:

The molarity is 2M

Explanation:

First , we calculate the weight of 1 mol of NaCl:

Weight 1mol NaCl= Weight Na + Weight Cl= 23 g+ 35, 5 g= 58, 5 g/mol

58,5 g---1 mol NaCl

233,772 g--------x= (233,772 g x1 mol NaCl)/58,5 g= 4 mol NaCl

A solution molar--> moles of solute in 1 L of solution:

2 L-----4 mol NaCl

1L----x0( 1L x4mol NaCl)/4L =2moles NaCl---> 2 M

Answer:

1

Explanation:

Its periodic number is 1.

Answer:

There are 1 plus that is the periodic number

Answer:

Waste-to-energy plants convert trash into energy. This energy produced is known as biomass

Explanation:

The plants that convert trash into energy are known as : Waste-to-energy plants. While The energy produced is nown as ; Biomass energy

Biomass energy is the type of energy gotten from renewable organic materials such as plants( corn and soya). It is generated by burning the renewable oragnic materials to generate heat and electricity. The plants that  convert trash into energy are known as waste-to energy plants.

Hence we can conclude that The plants that convert trash into energy are known as : Waste-to-energy plants. While The energy produced is nown as ; Biomass energy

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Answer:

4. 273 K and 373K.

Explanation:

Conversion from Celsius to Kelvin ..

Kelvin = Celsius + 273

Answer:

That should be CaCl2. Otherwise, all your mathematics would be for naught.

Explanation:

To find the number of moles of CaCl2 produced, multiply the number of moles of HCl by the mole ratio from the balanced chemical equation.

To determine the number of moles of CaCl2 produced from 1.4 moles of HCl reacting with calcium hydroxide, we need to use the balanced chemical equation:

2 HCl + Ca(OH)2 → CaCl2 + 2 H2O

From the equation, we can see that 2 moles of HCl react with 1 mole of CaCl2. Therefore, for every mole of HCl, we will produce 1/2 mole of CaCl2.

To find the number of moles of CaCl2 produced, we can use the following calculation:

1.4 moles HCl × (1/2 moles CaCl2 / 2 moles HCl) = 0.35 moles CaCl2

Therefore, 0.35 moles of CaCl2 will be produced from 1.4 moles of HCl reacting with calcium hydroxide.

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HCl Acid + Sodium Hydroxide ----> Sodium  Chloride + water.

Explanation:

                             HCl + NaOH → NaCl + H2O + Heat

339 grams of CLF3 is formed when F2 is in excess and 130 grams of CL2 reacts.

Explanation:

The balanced chemical reaction for the formation of ClF3 is given by:

[tex]Cl_{2}[/tex] + 3 [tex]F_{2}[/tex] ⇒ 2 Cl[tex]F_{3}[/tex]

the mass of Cl2 is given 130 grams

From the equation it is found that 2 moles of chloride reacts to form 2 moles of ClF3.

calculating the number of moles of chlorine by the formula:

Number of moles = mass of the substance ÷ atomic mass of one mole of the substance

n = 130 ÷ 35.45

   = 3.6671 moles

So, applying stoichiometry

2 moles of Cl2 formed 2 moles of ClF3

3.6671 moles of Cl2 will form x moles of ClF3

2 ÷ 2 = x ÷ 3.6671

x = 3.6671 moles of ClF3

now from the formula of number of moles

weight is calculated as n × mass of the gas

                                    3.6671 × 92.448

                                    =  339.01 grams of ClF3 is formed.

C12H208 is the molecular formula of the alcohol.

Explanation:

The weight of carbon given is 26.05 grams

The weight of H20 = 6.630 grams

first let us find the number of moles of:

number of moles = weight given ÷ mass of 1 mole of the element

                              = 26.05 ÷ 12

                               =  2.170 moles of carbon

number of moles of hydrogen present in H2O

    =  6.630 ÷ 18

     = 0.368

1 mole of water contains 2 mole of hydrogen so, 2 × 0.368 grams

= 0.7366 moles

Number of moles of oxygen cannot be calculated as of now.

So from the data obtained,

50 gms C2H2Ox is combusted.

Lets, calculate the gms from moles using the same equation

For carbon, 2.170 × 12

             = 26.04 grams

For hydrogen, 0.368 × 1.01

              =  0.3716 grams

adding the carbon and hydrogen content, 26.04 grams

now the oxygen content can be obtained by

50 - 26.04

= 23.96 grams

Now moles of oxygen calculated as

n = 23.96 ÷ 16

  = 1.49 moles of oxygen

The emperical formula for the alcohol is C6H04

now the molar mass is divided by emperial formula mass.

molar mass = 189 amu

emperial formula mass = 137

the division would give= 1.37

it can be taken as 2

The subscript in the formula is multiplied by 2 to get molecular formula from emperial formula.

So, C12H208 is the molecular formula of the alcohol.

Answer:

See below

Explanation:

Molarity = moles/Volume in Liters = (grams/formula wt)/Vol in Liters

=> Grams of solute = Molarity x Vol in Liters x formula wt

= (0.250M)(0.750L)(212.3g/mol)

= 39.8 grams

Final answer:

To find the mass of K3PO4 in a 0.250 M solution with a volume of 750.0 mL, calculate the number of moles and then multiply by the molar mass, resulting in 39.8 grams.

Explanation:

To calculate the mass of K3PO4 in a 0.250 M solution with a volume of 750.0 mL, we need to follow these steps:

Therefore, there are 39.8 grams of K3PO4 in 750.0 mL of a 0.250 M solution.

Answer: 1. Vinegar, used in the kitchen, is a liquid containing 3-6% acetic acid. It is used in pickles and in many food preparations.

2. Lemon and orange juice contains citric acid. Citric acid is used in the preparation of effervescent salts and as a food preservative.

3. Acids have been put to many uses in industry. Nitric acid and sulphuric acid are used in the manufacture of fertilizers, dyes, paints, drugs and explosives.

4. Sulphuric acid is used in batteries, which are used in cars, etc. Tannic acid is used in the manufacture of ink and leather.

5. Hydrochloric acid is used to make aqua regia, which is used to dissolve noble metals such as gold and platinum.

6. Sulphuric acid is used in manufacturing fertilizers such as super phosphate, ammonium sulpahte etc.

By stirring and increasing temperature, there is an increase in dissolving capacity of the solid solute.

Explanation:

If a solute is added to the solution, it doesn't get dissolve easily then we have to increase the temperature, which in turn increases the movement of the solvent (may be water) and the solute particles, thus increases the dissolving power of the solid solute. One more way is by constant stirring, that is by making more contact among the solvent as well as the solute particles there by increasing the solubility of solid solute.

Answer:Orbits

Explanation:All planets orbit around the sun at different speeds, directions, and time. Making it impossible to see all planets on any given time

Answer:

B) Orbits

Explanation:

got it right

The true statement about diffusion  is b. Molecules will move from high to low concentration until equilibrium is reached.

Molecules diffuse passively, moving from high-concentration regions to low-concentration regions without the requirement for external energy input.This motion continues until the system reaches equilibrium, at which point the concentration of molecules is uniform throughout. It's vital to remember that diffusion, which is caused by the random movement of particles, does not require a transport protein.

Option b, which highlights the movement of molecules from high to low concentration until a condition of equilibrium is reached, therefore appropriately captures a feature of diffusion.

complete question;

Which of the following is true of diffusion?

a. It requires energy.

b. Molecules will move from high to low concentration until equilibrium is reached.

c. It is a transport mechanism that requires a transport protein.

d. All of the above.

Answer:

We need 0.375 mol of CH3OH to prepare the solution

Explanation:

For the problem they give us the following data:

Solution concentration 0,75 M

Mass of Solvent is 0,5Kg

knowing that the density of water is 1g / mL,  we find the volume of water:

                           [tex]d = \frac{g}{mL} \\\\ V= \frac{g}{d} = \frac{500g}{1 \frac{g}{mL} } = 500mL = 0,5 L[/tex]

Now, find moles of [tex]CH_{3} OH[/tex] are needed using the molarity equation:

                           [tex]M = \frac{ moles }{ V (L)} \\\\\\molesCH_{3}OH = M . V(L) = 0,75 M . 0,5 L\\\\molesCH_{3}OH = 0,375 mol[/tex]

therefore the solution is prepared using 0.5 L of H2O and 0.375 moles of CH3OH,  resulting in a concentration of 0,75M