how to find the number of neutrons

​

Answer:

log = ( - 0.51 z 2) / ( 1 + ( / 305)

Explanation:

Mendeleev arranged the known elements in his periodic table according to atomic number (option D).

Periodic table is a tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same group (column).

The chemical elements are organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson.

Dmitri Mendeleev is the Russian scientist that formulated the periodic table of chemical elements and arranged them in order of increasing atomic number.

Learn more about periodic table at: https://brainly.com/question/11155928

#SPJ1

Answer: C.

Explanation:

according to atomic mass

Answer:

Liquids, They are the only one that can change shape to fit the container

Answer:

option A  is correct.

Explanation:

The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.

Chemistry => Thermochemistry => Enthalpy

We have a material that is heated until it goes from a solid state to a liquid state, that is, it melts.

To calculate the total energy we will take into account two stages:

1. Corresponds to the energy needed to raise the temperature from 20°C to 660°C.

2. The energy needed to melt aluminum at a constant melting temperature (660°C).

We will need the following data that we can find in the literature:

Specific heat of aluminum = 0.896J/g°C

enthalpy of fusion aluminum = 0.322J/g

For stage 1. the energy required will be calculated with the following equation:

Where,

Q is the energy required to raise the temperature

m is the mass of the aluminum soda can, 14g

Cp is the specific heat of aluminum, 0.896J/g°C

T2 is the final temperature, 660°C

T1 is the initial temperature, 20°C

We replace the known data:

For stage 2 the energy required will be calculated with the following equation:

Where

Qm is the energy required to melt the aluminum soda can

m is the mass, 14g

deltaHm is the enthalpy of fusion aluminum,0.322J/g

The energy required will be:

So, the total energy will be the sum of both energies. So, we will have:

Answer: It would take 8.0 kJ to melt 1 aluminum soda can

1. Temperature and salinity affect the flow of water in the ocean by creating density differences that drive ocean currents.

2. [image of warm and cold water mixing and creating a convection cell is mentioned below]

When warm water mixes with cold water in the ocean, a convection cell forms. Warm water rises and cold water sinks, which drives ocean currents. This process is influenced by other factors such as wind, Earth's rotation, and the shape of ocean basins.

What is density?

Density refers to the amount of mass per unit volume of water. At standard conditions (temperature of 4 degrees Celsius and pressure of 1 atmosphere), the density of pure water is approximately 1 gram per cubic centimeter (g/cm³). However, the density of water can vary depending on its temperature and salinity.

What is convection cell?

A convection cell is a circular pattern of fluid movement that arises when warm fluid rises and cold fluid sinks in a circular motion, creating a loop or cell. In the context of oceanography, convection cells can be formed when warm water rises and cold water sinks, either due to differences in temperature or salinity.

To know more about density, visit:

https://brainly.com/question/29775886

#SPJ1

Answer:

a. pH = 7.0

b. pH = 12.52

c. pH = 12.70

d. pH = 12.78

Explanation:

a. Deionized water has the [H⁺] of pure water = 1x10⁻⁷ (Kw = 1x10⁻¹⁴ = [H⁺][OH⁻] - [H⁺] = [OH⁻ -)

pH = -log[H⁺] = 7

b. Moles NaOH = 5x10⁻³L * (0.10mol / L) = 5x10⁻⁴moles OH⁻ / 0.015L = 0.0333M = [OH⁻]

-Total volume = 10mL+5mL = 15mL = 0.015L

pOH = -log[OH⁻] = 1.48

pH = 14-pOH

pH = 12.52

c. Moles NaOH = 0.010L * (0.10mol / L) = 1x10⁻³moles OH⁻ / 0.020L = 0.0500M = [OH⁻]

-Total volume = 10mL+10mL = 20mL = 0.020L

pOH = -log[OH⁻] = 1.30

pH = 14-pOH

pH = 12.70

d. Moles NaOH = 0.015L * (0.10mol / L) = 1.5x10⁻³moles OH⁻ / 0.025L = 0.060M = [OH⁻]

-Total volume = 10mL+15mL = 25mL = 0.025L

pOH = -log[OH⁻] = 1.22

pH = 14-pOH

pH = 12.78

NH3(aq)+HCl(aq)=NH4CI(aq) (ammonium chloride)

0.157 mol NH3 >> 6.91 kJ of energy

1 moles of NH3 >>>6.91 kJ/0.157

Delta H for this reaction per mole of NH3 consumed will therefore be :

ΔH =6.91 kJ/0.157

= 44.019kJ

∴ΔH per mole ≈44.02 kJ

The new volume of the balloon after heating it to a temperature of 51 °C is approximately 2.39 L.

Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.

It is expressed as;

\(\frac{V_1}{T_1} =\frac{V_2}{T_2}\)

Given that:

Substituting the given values and solve for V₂:

\(V_1T_2 = V_2T_1\\\\V_2 = \frac{V_1T_2}{T_1} \\\\V_2 = \frac{2.2\ *\ 324.15}{298.15 }\\ \\V_2 = 2.39 \ L\)

Therefore, the final volume is 2.39 litres.

Learn more about Charles's law here: https://brainly.com/question/23122443

#SPJ1

Answer:

electromagnetic energy.

Explanation:

please mark brainliest

Answer: Electromagnetic

Explanation:Visible light is a form of electromagnetic (EM) radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves. Generally, visible light is defined as the wavelengths that are visible to most human eyes.

Because a greater proportion of the Y2Y2 molecules will have the required energy to break through the activation energy barrier, line B will shift to the left.

Any group of atoms joined together by chemical bonds is referred to as a molecule. A molecule is created from any two atoms together. A compound is an organic molecule composed of atoms from several elements. Not all molecules are compounds, yet all molecules are compounds.

A substance like table salt (NaCl), which is formed of two different types of elements (sodium and chlorine), is a compound, but it is not a molecule since the connection that binds NaCl together is an ionic bond.

To know more about Molecule visit:

https://brainly.com/question/19922822

#SPJ4

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

Know more about  hydroxide ions   here:

https://brainly.com/question/28464162

#SPJ8

The valency of magnesium is 2 because it has two valence electrons in its outermost shell. Magnesium belongs to the second group of the periodic table, which means it has two electrons in its outermost shell or valence shell. In order to achieve a stable configuration, magnesium tends to lose these two valence electrons to form a positively charged ion with a charge of 2+. This makes magnesium a bivalent or divalent element with a valency of 2.

Answer:

Because the outer shell of magnesium contains 2 atoms

Answer:

\(\text{C}_4\text{H}_6\)

Explanation:

CH3CH2OH - Hydrogen bonds

CH3CH2CH3 - Dispersion forces

CH3CH2Cl - Dipole - Dipole interaction

Intermolecular forces are the attractive or repulsive forces that exist between molecules. These forces are responsible for determining many of the physical properties of materials, including their melting and boiling points, viscosity, and solubility.

The strength of intermolecular forces varies depending on the type of force and the molecules involved. In general, intermolecular forces increase with increasing polarity and molecular size.

Learn more about intermolecular forces:https://brainly.com/question/9007693

#SPJ1

Answer:

Explanation:

Just saw your request regarding answering this so here it is:

All of them belong of Group 1 in periodic table and thus are highly reactive! Pattern of reactivity for Group 1 (Alkali metals) increases as you move down the group as their radius keeps increasing and thus electrons can be easily lost. Thus, to ID the lumps, Sheena should look at their reactivity and she should get the following trend:

Most reactive: Potassium (K)

Intermediate: Sodium (Na)

Least reactive: Lithium (Li)

Hope it helps!

Answer:

180 g

Explanation:

At the end of the reaction, the mass is still expected to be 180g this is because in every chemical reaction, mass must be conserved.

According to the law of conservation of mass "in a chemical reaction, matter is neither created nor destroyed".

The wavelength of the gamma ray with a frequency of 1.0x10^19 Hz is approximately 3.0x10^-11 meters.

To find the wavelength of a gamma ray with a frequency of 1.0x10^19 Hz, we can use the equation:

Speed of Light = Wavelength x Frequency

The speed of light is approximately 3.0x10^8 meters per second.

Let's solve for the wavelength:

Wavelength = Speed of Light / Frequency

Wavelength = (3.0x10^8 m/s) / (1.0x10^19 Hz)

When dividing by a number expressed in scientific notation, we can subtract the exponents:

Wavelength = 3.0x10^8 / 1.0x10^19

To simplify this division, we can subtract the exponents of 10 and divide the coefficient:

Wavelength = 3.0x10^(8-19)

Wavelength = 3.0x10^-11

Therefore, the wavelength of the gamma ray with a frequency of 1.0x10^19 Hz is approximately 3.0x10^-11 meters.

For more question on frequency

https://brainly.com/question/254161

#SPJ11

The magnetic quantum number (ml) represents the orientation of the orbital in three-dimensional space the only possible value of the magnetic quantum number ml for a 1s electron is 0.

Quantum is the smallest possible unit of a physical quantity, such as energy or momentum. It is a fundamental concept in quantum mechanics, which is the branch of physics that deals with the behavior of matter and energy at the atomic and subatomic level.

The idea of quantization was first proposed by Max Planck in 1900, when he discovered that energy is emitted and absorbed in discrete units called "quanta" when studying the behavior of light and blackbody radiation. Later, this idea was extended to other physical quantities, such as the momentum and position of particles.

According to quantum mechanics, the behavior of particles and systems cannot be fully described using classical mechanics, which assumes that particles have definite positions and velocities at all times. Instead, the behavior of particles and systems is described using wave functions, which represent the probability of finding a particle at a given position and time.

The principles of quantum mechanics have important applications in many areas of physics, including atomic and molecular physics, condensed matter physics, and particle physics. They are also the basis.

To know more about quantum visit :

https://brainly.com/question/16746749

#SPJ1

Answer:

The basic unit of the nervous system is a nerve cell or neuron. The nervous system transmits signals between the brain and the rest of the body, this way, the nervous system's activity controls the ability to move, breathe, see, and think.

Explanation:

Have a great rest of your day
#TheWizzer

The helium tank has a pressure of 650 torr at 25 degree Celsius and when the temperature is tripled, the pressure will be approximately 1945.71 torr

To find the new pressure when the temperature is tripled, we can use the ideal gas law, which states that the pressure of a gas is directly proportional to its temperature when the volume and the number of particles remain constant. The ideal gas law is given by the 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.

First, we need to convert the initial temperature of 25 degrees Celsius to Kelvin. Adding 273.15 to the Celsius temperature gives us 298.15 K.

Let's assume that the volume, number of moles, and the gas constant remain constant.

If the temperature is tripled, the new temperature would be 3 times the initial temperature, which is 3 * 298.15 K = 894.45 K.

Now, we can set up a proportion to find the new pressure:

P1 / T1 = P2 / T2

Solving for P2 (the new pressure), we get:

P2 = (P1 * T2) / T1

Plugging in the values, we have:

P2 = (650 torr * 894.45 K) / 298.15 K

Calculating this expression, we find:

P2 ≈ 1945.71 torr

Therefore, when the temperature is tripled, the pressure will be approximately 1945.71 torr.

for more questions on pressure
https://brainly.com/question/24719118
#SPJ11

Answer: what is the answer

Explanation:

I need it nowwww

Explanation:

The term "basic unit of matter "refers to atom

A Atom

Answer:

130,000 cubic centimeters

Explanation:

The volume of a box is its length multiplied by its width multiplied by its height (lwh). 423 times 12 times 25 is 126,900. When multiplying, the number of significant figures is the same as the number with the least number of significant figures. The correct number of significant figures in this example is 2, so 126,900 would need to round up to 130,000 in order to have 2 significant figures.

The volume of an object is given by length * width * height

In order to obtain the volume of a box, in cubic centimeters, we need to note the following parameters;

length = 423 cm

width = 12 cm

height = 25 cm

Volume =  length * width * height

Volume = 423 cm * 12 cm * 25 cm

Volume = 127000 cubic centimeters.

Learn more: https://brainly.com/question/23526372

Answer:

See explanation

Explanation:

Water is a polar solvent and is also called a universal solvent because of its ability to dissolve several substances especially in the body.

The functions of water learned in the life sciences class include;

1. Water is the medium for biochemical reactions

2. Most substances in the body are transported from place to place by water.

3. Water acts a solvent for many biologically important substances in the body.

4. Water is necessary in helping animals to regulate their body temperature.

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Any time a liquid loses or receives energy, the temperature of the liquid changes.To calculate the amount pf energy change, the calorimeter monitors the weight of the fluid as well as the temperature change.

The 6000 series calorimeters' control systems serve as the foundation for the 6772 Calorimetric Thermometer, a high precision temperatures measuring device.It is a crucial component of both the 6755 Solution Calorimeter and the 6725 Semi-micro Calorimeter.

The calorimeter is a piece of equipment used in calorimetry, a procedure for calculating heat capacity and measuring the temperature of chemical processes or other physical changes.Among the most popular kinds are differential scanning operating, thermal micro cathode rays, titration calorimeters, and accelerated rate calorimeters.

To know more about energy visit:

https://brainly.com/question/1932868

#SPJ1