Number of paired electrons in Li

Answer:

72 Newton

Explanation:

force=mass x acceleration due to gravity

Force applied on object is 72 Newton​

Given that;

mass of thing = 6 kg

Acceleration = 12 m/s²

Find:

Force applied on object

Computation:

Force = mass × acceleration

Force applied on object = 6 × 12

Force applied on object = 72 Newton​

Learn more:

https://brainly.com/question/19734564?referrer=searchResults

When aluminum is reacts copper (II) chloride then it will form aluminum chloride and Copper.

Aluminum as well as copper(II) chloride combine very vigorously, causing the reaction mixture to become extremely hot as heat was produced, the aluminum foil to breakdown, a reddish brown solid to appear, as well as gas bubbles to be released.

The chemical reaction can be written as:

2Al + 3CuCl2 → 3Cu + 2AlCl3

Therefore, Copper and aluminum chloride will be formed after the reaction as a product.

To know more about  aluminum

https://brainly.com/question/28488595

#SPJ1

Answer:

True

Explanation:

If you were to change up the order the answer may be incorrect

The scientific process is linear and most commonly follows the same sequence of steps in the same order. However, it need to follow all the steps for all scientific process. Hence, the statement is false.

A scientific process is a well designed approach to investigate or analyze the problem and to test a relevant hypothesis. The steps included in the scientific process starts from a scientific question.

The question then generates a hypothesis based on the observations and standard data. The testing is conducted with well designed experiment with all practical tools available.

The experimental results are thoroughly evaluated and the reaches with a conclusion. The results are communicated through various journals. This is the general way of a scientific process. But not every scientific strictly need to follow this. Hence, the statement is false.

Find more on scientific process:

https://brainly.com/question/1347425

#SPJ6

The reaction is an oxidation-reduction reaction because here Sodium is oxidized from Na to Na⁺ while hydrogen is reduced from H⁺ to H₂⁰.

The reaction below: 3Na(s) + 3H₂O(l)= 3NaOH(aq) + H₂(g)

1. The reaction is an oxidation-reduction reaction because here Sodium is oxidized from Na to Na⁺ while hydrogen is reduced from H⁺ to H₂⁰.

2.  The substances oxidized are Na and reduced. is H⁺.

3. The reducing agent is Na and the oxidizing agent is H₂O.

4.  half ionic equation for the oxidation

  Na => Na⁺ + e⁻

The half ionic equation for the reduction equation.

H₂O + e⁻ => H₂

An oxidation-reduction reaction is any chemical response in which the oxidation number of a molecule, atom, or ion changes by way of gaining or losing an electron. Redox reactions are common and crucial to some of the basic features of lifestyles, such as photosynthesis, respiration, combustion, and corrosion or rusting.

Oxidation is a chemical procedure. it is defined as a method that occurs whilst atoms or agencies of atoms lose electrons. some other manner to define oxidation is when a chemical species gains oxygen or loses hydrogen. whilst these activities occur, oxidation takes area.

Learn more about the oxidation-reduction reactions here:-https://brainly.com/question/17136827

#SPJ9

Answer:

B

Explanation:

Because color change also indicates a physical change as well.

Answer:

all places 1 is the answer

Explanation:

please mark me as brainlest

Answer:

2000 mi

Explanation:

\(4 hr *\frac{500 mi}{hr} =2000 mi\)

The scientific statement is

D. There is life on some other planet in the universe aside from Earth.

A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.

Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.

Learn more about scientific statement at

https://brainly.com/question/19894291

#SPJ1

complete question

Which sentence is a scientific statement?

A.

Food cooked in ceramic pots has a better aroma than food cooked in copper pots.

B.

A tall glass of water tastes better with a lemon wedge and ice cubes.

C.

Today, there are more viewers watching baseball than ice hockey on television.

D.

There is life on some other planet in the universe aside from Earth

Answer:

Four basic components that affect the validity of an experiment are the control, independent and dependent variables, and constants. These basic requirements need to be present and identified to consider an experiment valid.

The concentration of starch in the original sample is 1 g/L.

The concentration of the original sample is determined as follows:

After diluting the sample 4-fold, the concentration of the starch = 1/4 of the original concentration.

The absorbance of the diluted sample is related to the absorbance of the original sample by the following equation:

A₁ = A₂x dilution factor

where;

Substituting the given values, we get:

A₁ = 0.5 x 4 = 2

Now we can use the Beer-Lambert Law to find the concentration of the original sample:

A = εbc

where

Since we do not know the value of ε or b, we will assume that they are constant and cancel out when we compare two measurements. Therefore:

A₁ / A₂ = c₁ / c₂

Substituting the given values, we get:

2 / 0.5 = c₁ / (c₂ x 4)

Solving for c₁:

c₁ = (2 / 0.5) x (1 / 4)

c₁ = 1 g/L

Learn more about concentration and absorbance at: https://brainly.com/question/29352272

#SPJ1

Answer:

When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly

Explanation:

Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.

Mendeleev might have grouped thallium in the same group as lithium and sodium due to many reasons:

Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.

Learn more:

brainly.com/question/17169639

Answer:

1. The warming climate has dried out California's landscape, turning it into a tinderbox. ... This is due in part to climate change: rising temperatures, have an exponential impact when it comes to setting the stage for catastrophic wildfires,

2. Due to the heat and temperature of the place and if the place is very dry.

3. It all depends on the weather. At times there can be less rain whereas at time there is a lot of rain or how much heat it is outside within years

4. Well California is really hot during the summer and it becomes really dry so that is the reason forest fires are getting worse

The enthalpy of vaporization for Benzene is 30.8 kJ/mol. 39.42 kJ is the energy change when 100g of Benzene boils at 80.1 degrees Celsius.

The amount of enthalpy or energy that must be added to a liquid substance into gas substance is called Enthalpy of Vaporization. It is also known as Latent heat of vaporization.

To calculate the energy use this expression:

\(Q = n \Delta H_{\text{vapo.}\)

where,

Q = Energy change

n = number of moles

\(\Delta H_{\text{Vapo.}}\) = Molar enthalpy of vaporization

Now find the number of moles

Number of moles (n) = \(\frac{\text{Given Mass}}{\text{Molar mass}}\)

                                   = \(\frac{100\ g }{78\ g/mol}\)

                                   = 1.28 mol

Now put the values in above formula we get

\(Q = n \Delta H_{\text{vapo.}\)

   = 1.28 mol × 30.8 kJ/mol

   = 39.42 kJ

Thus from the above conclusion we can say that The enthalpy of vaporization for Benzene is 30.8 kJ/mol. 39.42 kJ is the energy change when 100g of Benzene boils at 80.1 degrees Celsius.

Learn more about the Enthalpy of Vaporization here: https://brainly.com/question/13776849

#SPJ1

Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: The enthalpy of vaporization for Benzene is 30.8 kJ/mol. What is the energy change when 100g of Benzene boils at 80.1 degrees Celsius?

Answer:

It is the wettest layer of the atmosphere.It extends upto 10km upward from sea level.

Answer:

\( \huge{ \boxed{1.213 \: \text{moles}}}\)

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\( \bold{n = \frac{N}{L}} \\ \)

where

From the question

N = 7.30 × 10²³ NaCl molecules

\(n = \frac{7.30 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{7.30}{6.02} \\ = 1.2126\)

We have the final answer as

The percentage of chloride in the unknown sample is approximately 15.93%.

To calculate the percentage of chloride in the unknown sample, you can use the mass of silver chloride obtained to determine the number of moles of chloride in the original sample, and then convert that to a percentage.

First, calculate the number of moles of silver chloride by dividing the mass by its molar mass:

0.7332 g / 143.32 g/mol = 0.00513 mol AgCl

Next, calculate the number of moles of chloride in the original sample by assuming a 1:1 ratio of chloride ions to silver ions in the reaction:

0.00513 mol AgCl * 1 Cl- / 1 Ag+ = 0.00513 mol Cl-

Finally, divide the number of moles of chloride by the mass of the original sample and multiply by 100 to convert to a percentage:

(0.00513 mol Cl- / 0.3221 g) * 100 = 15.93%

So, the percentage of chloride in the unknown sample is approximately 15.93%.

To know more about molar mass

https://brainly.com/question/12127540

#SPJ4

The pre-exponential factor (A) and activation energy (Ea) for the hydrolysis of t-butyl chloride are 2.1 x 10^16 s^(-1) and 102 kJ mol^(-1), respectively. At 286 K, tis0 t is 3.52 x 10^(-9) s and tiH0 t is 4.02 x 10^10 s.

To calculate the values of tis0 and tiH0 at 286 K for the hydrolysis of t-butyl chloride, we can use the Arrhenius equation:

k = A * e^(-Ea/RT)

Where:

k = rate constant

A = pre-exponential factor

Ea = activation energy

R = gas constant (8.314 J/(mol·K))

T = temperature in Kelvin

Given:

A = 2.1 x 10^16 s^-1

Ea = 102 kJ/mol

T = 286 K

First, let's convert the activation energy from kilojoules per mole (kJ/mol) to joules per mole (J/mol):

Ea = 102 kJ/mol * 1000 J/kJ = 102,000 J/mol

Now we can calculate the values:

tis0 = 1 / (A * e^(-Ea/RT))

tiH0 = 1 / (k * e^(-Ea/RT))

Plugging in the given values:

tis0 = 1 / (2.1 x 10^16 s^-1 * e^(-102,000 J/mol / (8.314 J/(mol·K) * 286 K)))

tiH0 = 1 / (k * e^(-102,000 J/mol / (8.314 J/(mol·K) * 286 K)))

Evaluating these equations will give you the specific values of tis0 and tiH0 at 286 K for the hydrolysis of t-butyl chloride.

To know more about hydrolysis click this link -

brainly.com/question/30457911

#SPJ11

Answer:

2 circles one proton and one nucleon.draw quarks within each. strong nuclear force within protons between quarks and residual strong force between proton and nucleon (up,up,down in proton)

Explanation:

There are numerous ways that fossils can form, but the majority occur when a living thing—such as a plant or animal—dies and is swiftly buried by sediment—such as mud, sand, or volcanic ash and rock.

Thus, Only the hard bones or shells are left behind when soft tissues degrade, yet in some cases an organism's soft tissues can be retained and animals.

More sediment, volcanic ash, or lava may accumulate over the organism after it has been buried, and eventually all the layers harden into rock.

These once-living organisms are only revealed to us from within the stones when the process of erosion takes place, when the rocks are worn back down and washed away and fossil.

Thus, There are numerous ways that fossils can form, but the majority occur when a living thing—such as a plant or animal—dies and is swiftly buried by sediment—such as mud, sand, or volcanic ash and rock.

Learn more about Fossils, refer to the link:

https://brainly.com/question/31419516

#SPJ1

Answer:

1 = one

2 = fluorine

3 = Bromine

4 = increase

5 = first increaseas and then decreases

hope it helps

Answer:

The 5R's are Reuse, Reduce, Recycle, Repair and Recover.

Answer:

First blank: spiral arms

Second blank: center

Explanation:

(i) The air/fuel ratio by mass is approximately 0.0487 kg air / kg fuel.

(ii) The rate of heat loss from the combustion chamber is approximately 0.0349 kW.

To solve the given problem, we need to determine the air/fuel ratio by mass and the rate of heat loss from the combustion chamber. Let's calculate each of these values step by step:

(i) Air/Fuel Ratio by Mass:

To calculate the air/fuel ratio by mass, we need to determine the mass flow rates of air and fuel entering the combustion chamber.

Given:

Flow rate of fuel (benzene): 0.05 kg/min

To find the mass flow rate of air, we need to determine the stoichiometric ratio between air and fuel. The balanced equation for the combustion of benzene (C₆H₆) is:

C₆H₆ + (15/2)O₂ → 6CO₂ + 3H₂O

From the balanced equation, we can see that 1 mole of C₆H₆ reacts with (15/2) moles of O₂. Therefore, the stoichiometric ratio of air to fuel is:

(15/2) * (32 kg O₂ / 1 mole O₂) / (78 kg C₆H₆ / 1 mole C₆H₆) = 20.51 kg air / kg fuel

The air/fuel ratio by mass is the inverse of the stoichiometric ratio:

1 / (20.51 kg air / kg fuel) = 0.0487 kg fuel / kg air

Therefore, the air/fuel ratio by mass is approximately 0.0487 kg air / kg fuel.

(ii) Rate of Heat Loss from the Combustion Chamber:

To determine the rate of heat loss, we can use the energy balance equation for the combustion chamber. The energy balance equation is:

Q_in - Q_out - W_out = ΔE_system

where:

Q_in = Heat input from fuel combustion

Q_out = Heat loss from the combustion chamber

W_out = Work output from the combustion chamber

ΔE_system = Change in internal energy of the combustion chamber

In this case, the process is steady flow and constant pressure, so there is no work output (W_out). Additionally, we can assume that there is no change in internal energy (ΔE_system ≈ 0) since the temperature difference is relatively small.

Therefore, the energy balance equation simplifies to:

Q_in - Q_out = 0

This means that the heat input from fuel combustion is equal to the heat loss from the combustion chamber.

To calculate the rate of heat loss, we need to determine the heat input from fuel combustion. The heat of combustion for benzene (C₆H₆) is -3267 kJ/mol.

Given:

Flow rate of fuel (benzene): 0.05 kg/min

Heat of combustion of benzene: -3267 kJ/mol

First, we need to convert the flow rate of fuel to moles per minute. The molar mass of benzene (C₆H₆) is:

(6 * 12 kg/mol) + (6 * 1 kg/mol) = 78 kg/mol

The moles of benzene consumed per minute is:

(0.05 kg / min) / (78 kg/mol) = 0.000641 mol / min

The heat input from fuel combustion is:

Heat input = moles of fuel * heat of combustion

= 0.000641 mol / min * (-3267 kJ/mol)

= -2.095 kJ/min

Since the heat input and heat loss are equal (Q_in = Q_out), the rate of heat loss from the combustion chamber is 2.095 kJ/min (or 0.0349 kW).

Therefore, the rate of heat loss from the combustion chamber is approximately 0.0349 kW.

Learn more about Combustion from the link given below.

https://brainly.com/question/31123826

#SPJ4

Answer:

+1

Explanation:

The oxidation number of Hydrogen atom is +1. As Nitrogen is more electronegative than Carbon, the oxidation number of Nitrogen is - 3. The Net charge on the compound is zero.

(hope that helps)

The temperature when the gas has a volume of 100 mL will be approximately 28.6°C.


To solve this problem, we'll use Charles's Law, which states that the volume of a gas is directly proportional to its temperature when the pressure and the amount of gas are constant. The formula for Charles's Law is V1/T1 = V2/T2, where V1 and T1 represent the initial volume and temperature, and V2 and T2 represent the final volume and temperature.
Given: V1 = 147 mL, T1 = 42°C, V2 = 100 mL. Convert the Celsius temperatures to Kelvin: T1 = 42 + 273 = 315 K.
Now, we'll solve for T2:
(147 mL / 315 K) = (100 mL / T2)
T2 = (100 mL * 315 K) / 147 mL
T2 ≈ 214.3 K
Finally, convert back to Celsius: T2 = 214.3 - 273 ≈ 28.6°C.

Learn more about Charles's Law here:

https://brainly.com/question/16927784

#SPJ11

Answer:

B: Sublimation

Explanation:

took the test on edge

Answer:

B on edge 2020

Explanation:

Please give brainliest

Answer:

If you are given with the atomic number of an element you can find it's period number and group number. The period number is related to the number of electron occupied shells in the element and the period number is linked to its valence electrons.

Explanation:

hope it helps luv <3

Answer:

A. fluorine

Explanation:

hope this helps

have a good day

stay safe byee

The element that is most stable based on its electron configuration is argon. The correct option is D.

The electron configuration of any atom or molecule in atomic or molecular orbitals is renowned in atomic physics and quantum chemistry.

Noble gases have a stable ns2np6 configuration with their octet completely filled, giving them stability. There is one exception: helium.

The electron configuration is commonly used to describe an atom's orbitals in its ground state, but it can also be used to represent an atom that has ionized into a cation or anion by compensating for electron loss or gain in subsequent orbitals.

8A Group Noble and inert gases The noble gases of Group 8A (or VIIIA) of the periodic table are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

Thus, the correct option is D.

For more details regarding electronic configuration, visit:

https://brainly.com/question/13497372

#SPJ2

When the carbonic acid sodium bicarbonate buffer pair buffers lactic acid, the following reaction occurs:$$\text{HCO}_3^- + \text{H}^+ \leftrightarrow \text{H}_2\text{CO}_3$$The carbonic acid/bicarbonate buffer system is one of the most important in human blood. When the pH of the blood decreases (becomes more acidic), the amount of bicarbonate ions in the blood decreases, and the concentration of hydrogen ions increases.

A buffer is a solution of a weak acid and its conjugate base that prevents changes in pH when small amounts of strong acid or base are added. Buffer systems protect organisms from pH changes by regulating and neutralizing acids and bases that enter or are produced by cells.

When the carbonic acid sodium bicarbonate buffer pair buffers lactic acid, the following reaction occurs:$$\text{HCO}_3^- + \text{H}^+ \leftrightarrow \text{H}_2\text{CO}_3$$The carbonic acid/bicarbonate buffer system is one of the most important in human blood. When the pH of the blood decreases (becomes more acidic), the amount of bicarbonate ions in the blood decreases, and the concentration of hydrogen ions increases. To balance the excess hydrogen ions, carbonic acid (H2CO3) is formed from carbon dioxide (CO2) and water (H2O). Carbonic acid then decomposes to form bicarbonate ions and hydrogen ions, and the pH of the blood is returned to normal. The bicarbonate ions act as a base, neutralizing the excess hydrogen ions that cause the blood to become more acidic. This is called the bicarbonate buffer system. Lactic acid is produced during intense exercise when the body doesn't get enough oxygen to meet its energy needs. The buildup of lactic acid in muscles can cause fatigue and muscle soreness. The carbonic acid/bicarbonate buffer system can also help to buffer the excess lactic acid produced during exercise, preventing the blood from becoming too acidic.

To know more about sodium bicarbonate visit :

brainly.com/question/8506770

#SPJ11

To prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.The ratio of benzoic acid to sodium benzoate in the buffer solution using the Henderson-Hasselbalch equation.

To prepare a pH 4.00 buffer solution using benzoic acid and sodium benzoate, we need to calculate the appropriate volumes of the 0.100 M benzoic acid and 0.240 M sodium benzoate solutions.

First, we need to determine the ratio of benzoic acid to sodium benzoate in the buffer solution. The Henderson-Hasselbalch equation can help us with this calculation:

pH = pKa + log([A-]/[HA])

Given that the pH is 4.00 and pKa is 4.20, we can rearrange the equation:

log([A-]/[HA]) = pH - pKa

log([A-]/[HA]) = 4.00 - 4.20

log([A-]/[HA]) = -0.20

Next, we take the antilog of -0.20 to find the ratio of [A-] to [HA]:

[A-]/[HA] = antilog(-0.20)

[A-]/[HA] = 0.63

The ratio of [A-] to [HA] is 0.63.

Now, let's calculate the volumes of each solution needed. Let's assume x represents the volume (in mL) of the 0.100 M benzoic acid solution and y represents the volume (in mL) of the 0.240 M sodium benzoate solution.

Since the total volume is 100.0 mL, we have the equation: x + y = 100

Considering the ratio of [A-] to [HA] as 0.63, we can write the equation: y/x = 0.63

Solving these two equations simultaneously will give us the volumes of each solution:

x + y = 100

y/x = 0.63

By substituting y = 0.63x from the second equation into the first equation, we get:

x + 0.63x = 100

1.63x = 100

x = 61.35 mL (rounded to two decimal places)

Substituting this value back into the equation x + y = 100, we find:

61.35 + y = 100

y = 38.65 mL (rounded to two decimal places)

Therefore, to prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.

To know more about the Henderson-Hasselbalch equation, click here, https://brainly.com/question/31732200

#SPJ11