2.
Gallium sulfide
How do I draw this in Lewis dots?

Answer:

15.6 g

Explanation:

Given that;

Mass of original sample = No = 500g

mass of sample remaining at 910 ms = N = ?

time taken to decay= 910 ms

Half life of Ca-37 = 181 milliseconds

From;

N/No = (1/2)^t/t1/2

N/500 = (1/2)^910/181

N/500 = (1/2)^5

N/500 = 1/32

32 N = 500

N = 500/32

N = 15.6 g

When water changes from a solid to a liquid it is called melting.

Solid ice melts and forms into a liquid: water.

If this incorrect, please, don't refrain to tell me. Thank you.

Answer:

0.0526 gallons

Explanation:

Here is another way to set up the solution.  (It will give the same answer as Michael's solution.) w = number of gallons of pure waterYou have 1 gallon of pure antifreezeYou want 95% antifreeze in 1+w gallons You can do a weighted combination of concentrations of antifreeze. (0%)(w) + (100%)(1) = (95%)(1 + w) 100 = 95(1 + w) w = 100/95 - 1 ≅ 0.0526 gallons

If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

learn more about hydrogen gas :

https://brainly.com/question/30829657

Answer:

An object that has a higher density than the liquid it's in will sink

Explanation:

hopefully I helped

The branch of science that studies atoms is called "Atomic Physics" or "Atomistics".

It is a subfield of physics that deals with the behavior of atoms and their interaction with other atoms and electromagnetic radiation. Atomic physics explores the structure of atoms, the properties of atomic particles such as electrons, protons, and neutrons, and the ways in which atoms interact with each other and with external stimuli.

It also includes the study of phenomena such as ionization, excitation, and the emission and absorption of light by atoms.

Atoms are the basic building blocks of matter. They are the smallest unit of matter that still retains the chemical properties of an element. Atoms are composed of the three types of particles: protons, neutrons, and electrons.

To know more about atoms here

https://brainly.com/question/29695801

#SPJ4

Answer: A is better trust me I qualified my sats

Explanation:

Step 1

Empirical formula definition:

In chemistry, the empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound.

-----------------

Step 2

Information provided:

Composition,

50.7 % C

9.9 % H

39.4 % N

-----------------

Step 3

Assuming a 100 grams sample:

50.7 % C => 50.7 g C

9.9 % H => 9.9 g H

39.4 % N => 39.4 g N

-----------------

Step 4

The number of moles of each element is calculated as:

(Please, use your periodic table)

50.7 g C x (1 mole C/12.01 g C) = 4.22 moles C

9.9 g H x (1 mole H/1.008 g H) = 9.82 moles H

39.4 N x (1 mole N/14.00 g N) = 2.81 moles N

-----------------

Step 5

Each number in step 4 will be divided by the smallest one of the 3. It is also needed integer numbers.

4.22 moles C/2.81 moles N = 1.5

9.82 moles H/2.81 moles N = 3.5

2.81 moles N/2.81 moles N = 1

As we need integer numbers, we will multiply all these numbers by 2 as it follows:

C => 1.5 x 2 = 3

H => 3.5 x 2 = 7

N => 1 x 2 = 2

Therefore, the empirical formula will be:

Answer:

When the reaction is subjected to pressure, the equilibrium will shift to the side with fewer gas molecules, which is the left side. Therefore, the answer is c. left.

According to Le Chatelier's principle, when a system at equilibrium is subjected to a change in pressure, it will respond by shifting in a way that reduces the effect of the change. In this case, increasing the pressure would cause the equilibrium to shift towards the side with fewer gas molecules to alleviate the increase in pressure.

Since there are fewer gas molecules on the left side of the reaction (2 CO + O2), the equilibrium will shift to the left to reduce the total number of gas molecules. This means that the concentrations of CO and O2 will increase, while the concentration of CO2 will decrease until a new equilibrium is established. Thus, the equilibrium will shift to the left.

To learn more about gas molecules click here

brainly.com/question/30832032

#SPJ11

Answer:

D. genetic modification

Explanation:

Out of the given examples, genetic modification represents the use of modern biotechnology. Genetic modification involves the direct manipulation of an organism’s DNA using biotechnology techniques to produce desired traits or characteristics. This is a relatively recent development in biotechnology and is used in various fields such as agriculture, medicine, and environmental science.

Bread making and cheese making are traditional food production techniques that have been used for centuries and do not necessarily involve modern biotechnology. Selective breeding is also a traditional technique that has been used for thousands of years to develop desired traits in plants and animals by choosing which individuals are allowed to reproduce.

Answer: C. A redox reaction at two electrodes causes electrons to flow

Explanation:

A galvanic cell work like a a redox reaction at two electrodes causes electrons to flow.

Redox reactions include a modification inside the oxidation state of the substrate. Losing of electrons or a rise in an element's oxidation state are both considered to be oxidation. Gaining electrons or lowering an object's or its atoms' oxidation state are both considered reductions.

An electrochemical cell wherein an electric current being produced spontaneously is called a galvanic cell as well as voltaic cell, respectively called just after scientists Luigi Galvani as well as Alessandro Volta. reduction-oxidation processes

In order to create a conduit for the passage of electrons through into the wire, each half-reaction in a galvanic cell is connected to the other by a wire, which allows the movement of electrons to be separated in the oxidation and reduction processes.

To know more about galvanic cell

https://brainly.com/question/13031093

#SPJ2

Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

Answer:

The government allocates a budget for research every year. The spending of that money is determined by government priorities. Some of the money is spent directly, in government-funded research centers.

Other money is distributed to other research institutions.

Money spent by other institutions for research has no government oversight.

Explanation:

C. physical change

Explanation:

That's the answer

The decrease in boiling temperature in K is 3.1 K, in °F is approximately 5.58 °F, and in °R is approximately 464.58 °R for each 1000 m rise in altitude.

To convert the decrease in boiling temperature from Celsius (°C) to Kelvin (K), Fahrenheit (°F), and Rankine (°R), we can use the following conversion formulas:

K = °C + 273.15

°F = (°C × 9/5) + 32

°R = °F + 459.67

Given that the decrease in boiling temperature is approximately 3.1 °C for each 1000 m rise in altitude, we can calculate the corresponding values:

Decrease in boiling temperature in K:

ΔT(K) = 3.1 °C

ΔT(K) = 3.1 K (since 1 K = 1 °C)

Decrease in boiling temperature in °F:

ΔT(°F) = (3.1 °C × 9/5) + 32

ΔT(°F) = 5.58 °F

Decrease in boiling temperature in °R:

ΔT(°R) = ΔT(°F) + 459.67

ΔT(°R) = 464.58 °R

Learn more about temperature -

brainly.com/question/4735135

#SPJ11

Yes, all the liquid will evaporates,

given that :

vapor pressure of liquid carbon disulfide = 100mmHg = 0.1315 kpa

temperature = 268 K

volume of the container = 370 mL = 0.370 L

using ideal gas equation we get :

PV = n R T

n = P V / R T

n = ( 0.315 × 0.370 ) / ( 0.0823 × 278)

n = 0.0050 mol = 5.0 × 10⁻³ mol

number of moles of CS₂ = mass / molar mass

                                        = 0.0979 / 76.139

                                        = 0.00128 mol

                                        = 1.2 × 10⁻³ mol

it is clear that , the vapor pressure of liquid carbon disulfide, , is 100. mm hg at 268 k. a 0.0979 g sample of liquid is placed in a closed, evacuated 370. ml container at a temperature of 268 k. yes the temperature remains constant, all of the liquid evaporate.

To learn more about vapor pressure here

https://brainly.com/question/14664529

#SPJ4

Answer:

In simple terms it is when two chemicals bond with each other

Explanation:

For more detailed explanation here's your answer:-

The correct IUPAC name of the compound is 7-chlorohept-(3E)-en-1-yne.

The IUPAC name of a compound is determined by following a set of rules established by the International Union of Pure and Applied Chemistry (IUPAC). To determine the correct name of the compound given, we need to analyze its structure and identify the functional groups, substituents, and their positions.

In this case, the compound has a chain of seven carbon atoms (hept) with a chlorine atom (chloro) attached at the 7th position. It also contains a triple bond (yne) and a double bond (en) on adjacent carbon atoms. The stereochemistry of the double bond is indicated by the E configuration, which means that the two highest priority substituents are on opposite sides of the double bond.

Therefore, the correct IUPAC name of the compound is 7-chlorohept-(3E)-en-1-yne.

To learn more about IUPAC name click here: brainly.com/question/16631447

#SPJ11

The letter "d" corresponds to the emission of a violet photon since it falls within the wavelength range of 380-450 nm and the frequency range of 668-789 THz.

Wavelength is the distance between two consecutive peaks (crests) or troughs (valleys) of a wave. It is an important property of a wave, which is usually measured in meters, centimeters, or nanometers. Wavelength is related to the frequency of a wave, as it determines the amount of energy carried by the wave. It is an important factor in the study of sound and light, as the different wavelengths of light and sound have different properties. Wavelength is also used in communication technologies such as radio and TV, where it determines the range of frequencies available to transmit a signal.

To learn more about wavelength
https://brainly.com/question/28995449
#SPJ1

A) If, the pressure is 10.0 atm, the temperature in the 2.50 L container filled with 175 g of argon is approximately 57.3 K. B) If the temperature is 225 K, the pressure in the 2.50 L container filled with 175 g of argon is approximately 79.1 atm.

Firstly, we can use the ideal gas law equation;

PV = nRT

Where;

P = pressure (in atm)

V = volume (in liters)

n = number of moles of gas

R = ideal gas constant (0.0821 L·atm/mol·K)

T = temperature (in Kelvin)

Given;

V = 2.50 L

m (mass of argon) = 175 g

P = 10.0 atm

First, we need to calculate the number of moles of argon using the given mass and the molar mass of argon.

The molar mass of argon will be approximately 39.95 g/mol.

Number of moles (n) = mass/molar mass

n = 175 g / 39.95 g/mol

n ≈ 4.38 mol

Now, we rearrange the ideal gas law equation to solve for temperature (T);

T = PV / (nR)

Substituting the given values, we have:

T = (10.0 atm) × (2.50 L) / (4.38 mol × 0.0821 L·atm/mol·K)

Calculating this expression, we find;

T ≈ 57.3 K

Therefore, if the pressure is 10.0 atm, the temperature in the 2.50 L container filled with 175 g of argon is approximately 57.3 K.

Given;

T = 225 K

To find the pressure (P), we rearrange the ideal gas law equation as follows;

P = nRT / V

Substituting the given values, we have:

P = (4.38 mol × 0.0821 L·atm/mol·K × 225 K) / (2.50 L)

Calculating this expression, we find:

P ≈ 79.1 atm

Therefore, if the temperature is 225 K, the pressure in the 2.50 L container filled with 175 g of argon is approximately 79.1 atm.

To know more about container here

https://brainly.com/question/13227218

#SPJ4

--The given question is incomplete, the complete question is

"A 2.50-L container is filled with 175 g argon. a. If the pressure is 10.0 atm, what is the temperature? b. If the temperature is 225 K, what is the pressure? "--

The two processes that together constitute the M phase of the cell cycle are mitosis and cytokinesis.

Mitosis is the process by which the nucleus of a cell divides into two daughter nuclei.

It consists of several stages, including prophase, metaphase, anaphase, and telophase, where the duplicated chromosomes align, separate, and segregate into two daughter cells.

Cytokinesis, on the other hand, is the division of the cytoplasm that follows mitosis.

In cytokinesis, the cell membrane pinches inward in animal cells or a cell plate forms in plant cells, ultimately dividing the cytoplasm into two distinct daughter cells.

Both ensure the accurate distribution of genetic material and cellular components to daughter cells during cell division, enabling growth, tissue repair, and the production of new cells.

Read more about M Phase.

https://brainly.com/question/2396792

#SPJ11

Answer:

900g

Explanation:

Given parameters:

Number of moles  of Sc  = 20moles

Unknown:

Mass of Sc  = ?

Solution:

To find the mass of the scandium given, we use the expression below:

      Mass  = Number of moles x molar mass

Molar mass of Sc   = 45g/mol

So;

     Mass of Sc  = 20 x 45 = 900g

A one-step process would require a higher energy input and may not be as economically viable. The two-step process for producing methanol from methane and water is used because it is more thermodynamically favorable.

The first step, which produces carbon monoxide and hydrogen gas, has a positive ΔH∘ of 214.7 J/K, meaning it requires energy input. However, the second step, which produces methanol from the carbon monoxide and hydrogen gas, has a negative ΔH∘ of -332.3 J/K, meaning it releases energy. By combining these two steps, the overall ΔH∘ for the reaction is negative and energy is released, making the process more efficient. A one-step process would require a higher energy input and may not be as economically viable.
Methanol (CH3OH) is produced from methane (CH4) and water (H2O) through a two-step process. In Step 1, methane and water react to form carbon monoxide (CO) and hydrogen gas (H2). This reaction has a standard enthalpy change (ΔH°) of 214.7 kJ and a standard entropy change (ΔS°) of -332.3 J/K at 298 K.

To know about methane :

https://brainly.com/question/12645635

#SPJ11

Answer:

0.225 L = 225 mL

Explanation:

Charles' Law states that for a fixed pressure, the volume is directly proportional to the temperature, which means things expand at the same rate as the rate of it being heated up

Mathematically, we can write that as:

V1/T1 = V2/T2, where 1 and 2 are the two situations

So, when we substitute the values in, we get:

0.25 L/298 K = V2/268 K

Rearranging this, we get:

(0.25/298) x 268 = 0.225 L = 225 mL.

This also makes sense, as the volume reduced a little when the temperature reduced (cooled down)

Let me know if this makes sense, and hope I helped! :)

Answer

Electrons live inside the nucleus and carry a neutral charge.

Explanation:

Answer:

ionic

Explanation:

because when in molten or dissolved in water  ions are free to move and carry  a charge however when in solid the ions are fixed in position so can't carry a charge.

Answer:

huh

Explanation: