What information does not need to be included a chemical waste label? Select one: Relative amounts of chemical compounds in the container. The date the waste container was filled completely. A description of the experiment the chemicals were used for. Names of the chemical compounds present in the container.

Answer:

The answer is letter A.

Answer:

The poster should include:

 TITLE: Creative name of superhero.

 DESCRIPTION OF ELEMENT SUPERHERO (2 PARAGRAPHS):

This section should include a brief description of how your superhero acquired, used, or lived

with their element power. You may want to describe where does your superhero element lives

(where in nature can it be found). What are his/her superpowers? Does your superhero

element have a hideout? What are his/her strengths? What is his/her weakness? Who is

his/her arch nemesis (evil super villain)? What kind of super suit does your superhero have?

 5 FACTS:

This section should include at least 5 fun facts about your element. You can choose to

describe facts that illustrate where your element is found in nature. You may also wish to

describe what is your element used for. You may address what are characteristics of your

element or what are important uses of your element. For example, can your element be made

into something useful or can your element combine with other elements to make something

totally different.)

 ATOMIC DRAWING

Include the atomic structure of your element with correct labeling of its protons neutrons,

electrons. Make sure your drawing has the correct number of protons, neutrons, electrons.

 DRAWING OF YOUR ELEMENT SUPERHERO

This section should include a drawing (in color) of your Element Superhero on a clean sheet of

WHITE paper. You may want to draw your Element Superhero fighting his nemesis (super

villain). Or you may want to draw your Element Superhero using his special powers.Explanation:

The correct option is c. 3.5 percent. Seawater is a solution of salts, including sodium chloride (table salt), magnesium, and calcium. The other options are not correct percentages.

Option a, 96.5 percent, would mean that seawater is almost entirely made up of dissolved salts, which is not the case. Option b, 9.65 percent, is also too high and would mean that seawater is almost 10% salt, which is much higher than the actual concentration. Option d, 35 percent, is also too high and would mean that seawater is more than one-third salt, which is not the case either. The actual concentration of salts in seawater is about 3.5%, which is equivalent to 35 parts per thousand (ppt).
The percentage of dissolved salts in seawater is approximately 3.5 percent (option c). Seawater contains various dissolved elements and compounds, with the most abundant being sodium chloride (common table salt). The salinity of seawater can vary depending on factors such as evaporation, precipitation, and runoff from land, but the average global salinity remains close to 3.5 percent.

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Answer:A

Explanation:

To do the experiment

The experimental setup is the part of the scientific method that is done to prove the hypothesis. The test variable of the experiment is the height of the tray as it may cause an effect. Thus, option C is correct.

The independent variable has been the test variable that does not depends on other variables and is manipulated by the researcher. It has no fixed value and parameter and is subject to alteration so as to cause an effect on the other variable.

The height of the tray is the independent variable and the mass of the sand is the dependent variable. The height affects the mass of the sand eroded at the bottom. The speed and amount of water have been the controlled variable.

Therefore, option C. the height of the tray with the sand is the independent variable.

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16.91 grams of hydrogen chloride are formed if 24.7 grams of ammonium chloride react to form 7.9 grams of ammonia.

The response of ammonium chloride (NH4Cl) separating to shape smelling salts (NH3) and hydrogen chloride (HCl) can be addressed as:

NH4Cl → NH3 + HCl

To decide the mass of HCl shaped, we want to utilize the law of protection of mass. This expresses that the complete mass of the reactants is equivalent to the absolute mass of the items.

The molar mass of NH4Cl is 53.49 g/mol, and the molar mass of NH3 is 17.03 g/mol. We can utilize this data to ascertain the quantity of moles of NH3 delivered, which is 0.464 mol.

Utilizing the stoichiometry of the decent compound condition, we realize that 1 mole of NH3 is delivered alongside 1 mole of HCl. So, the quantity of moles of HCl created is additionally 0.464 mol.

The molar mass of HCl is 36.46 g/mol. We can utilize this to ascertain the mass of HCl delivered, which is 16.91 g.

So, 16.91 grams of hydrogen chloride should at the same time be framed.

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Feel free to comment if u dont understand it :)

According to the concept of Avogadro's number , there are 4.48 moles in 2.70 X 10 ²⁴ atoms of copper.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number

To obtain number of moles divide number of atoms by Avogadro's number that is  2.70 X 10 ²⁴ /6.023×10²³=4.48 moles .

Thus, there are 4.48 moles in 2.70 X 10 ²⁴ atoms of copper.

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Answer:

Au. fifififiof

Explanation:

djdjdjndsksidndndnendnnd

Answer:

Rb

Explanation:

Answer:

From becoming magma. It comes to the surface because of the tectonic plates shifting, it's able to escape from the cracks. it also may cause the plates to melt and allow the magma to rise.

Explanation:

deep underground, rocks are put under tons of pressure and extremely hot temperatures, causing them to melt into magma. sometimes the magma cools and becomes igneous rock. Magma makes it to the surface by either escaping through cracks in tectonic plates or by melting the plates and rising.

Answer:

A and C

Explanation:

I think it's A and C but I could be wrong

Ionic and covalent bonds differ in terms of bond formation, electron sharing, and the types of elements involved. When the pH goes from 7 to 4, the concentration of H+ ions increases, leading to a decrease in OH- concentration. This shift indicates a more acidic solution.

Ionic bonds occur between a metal and a non-metal, where electrons are transferred from the metal to the non-metal, resulting in the formation of charged ions. Covalent bonds, on the other hand, occur between non-metal atoms that share electrons to achieve a stable electron configuration.

When the pH goes from 7 to 4, it indicates a decrease in the pH value, shifting towards acidity. The pH scale is logarithmic, meaning that each unit change represents a tenfold difference in H+ ion concentration. As the pH decreases, the concentration of H+ ions increases, while the concentration of OH- ions decreases. This is because the concentration of H+ and OH- ions in water is inversely proportional, following the equation: [H+][OH-] = 1.0 x \(10^{-14}\) at 25°C. Therefore, when the pH decreases, the concentration of H+ ions increases, leading to a decrease in OH- concentration.

Based on the pH table, a pH of 7 represents a neutral solution, where the concentration of H+ ions is equal to the concentration of OH- ions. As the pH decreases to 4, the concentration of H+ ions increases by a factor of 1,000, while the concentration of OH- ions decreases accordingly. This shift towards a higher H+ concentration indicates a more acidic solution.

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The answer is 7-chloro-3-ethyl-4-methyl-3-heptene.

We start the numbering from the side from which the double bond will come under the lowest combination. So if we start from the top left side, the double bond starts at the 3rd position. If we start numbering at the chlorine side, then the double bond comes at the 4th position. Now we identify the longest chain.

The longest chain would be from the top left corner to the top right corner. There will be 7 carbon atoms in the chain. Then after numbering, we identify the substituents. The substituents will be ethyl, methyl, and chlorine at 3,4, and 7 positions respectively. The naming is done alphabetically.

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The normal boiling point is approximately 78 degrees Celsius (or 173 degrees Fahrenheit) at standard atmospheric pressure.

The normal boiling point is defined as the temperature at which the vapor pressure of a liquid is equal to the atmospheric pressure. The value of the normal boiling point varies depending on the substance. For example, the normal boiling point of water is approximately 100 degrees Celsius (or 212 degrees Fahrenheit) at standard atmospheric pressure (760 mmHg). This means that at this temperature, the vapor pressure of water is equal to 760 mmHg, which is the atmospheric pressure at sea level. However, for other substances, such as ethanol, the normal boiling point is approximately 78 degrees Celsius (or 173 degrees Fahrenheit) at standard atmospheric pressure. It is important to note that the value of the normal boiling point can vary based on external factors such as altitude and pressure. In summary, the approximate value of the normal boiling point varies for different substances and can be expressed to two significant figures.

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The heat of reaction at 298 K for the reaction is -286.4 kJ. This can be calculated by adding the enthalpy of the reactants and subtracting the enthalpy of the products.

The enthalpy of the reactants is -393.5 kJ + -285.8 kJ = -679.3 kJ. The enthalpy of the products is 890.3 kJ.

Thus, the heat of reaction at 298 K is -679.3 kJ + 890.3 kJ = -286.4 kJ.

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Answer:

The element argon is in column 8A and is a noble gas. Nobles gases are completely stable because their outershell is filled with all eight electrons.  Argon has eight valence electrons.

Answer:

The answer is Double - Replacement Reactions

Explanation:

Double - Replacement Reactions are two different things that change places with each other.

Answer:

19.5%

Explanation:

the air required for human breathing is 19.5 percent.

The Element 1 and Element 3 are metals, while Element 2 is a nonmetal

Why find will be element metal or nonmetal?

In the table below, descriptions of an experiment on samples of three different chemical elements are given Description Element 1Metal Moderately soft yellow solid.

A 5 cm x 5 cm square of it, only 1 mm thick, is heated with a flame at one end.

Where the flame touches the square, the sample rapidly turns red and starts to melt, but the rest of the square remains cool to the touch.

Element 2 Nonmetal Faintly yellow gas.

100 cm of the gas are compressed to a new volume of 10 cm.

When the compressed gas is allowed to leak out through a small hole, it becomes warmer. Element 3 MetalHard silvery-gray solid. A 10. g cube of it is set on a hot 50 °C plate.

After 1 minute, the temperature of the top of the cube has risen by 2.2 °C.

The have been highlighted above in bold letters. It is quite clear that Element 1 and Element 3 are metals, while Element 2 is a nonmetal.

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When water is lost, but electrolytes are retained, the first thing that happens is that moves water from the ICF to the ECF.

The fluid inside of cells, also called the cytoplasm or cytosol, makes up about 60% of the water in the human body, totaling about 7 gallons. Organelles like the nucleus, endoplasmic reticulum, mitochondria, lysosomes, and Golgi apparatus are suspended in and supported by the ICF. Also found in the ICF are cellular building blocks like sugars, proteins, carbohydrates, and lipids.

ECFs are any body fluids that are not inside cells. The two main components of ECF are plasma and interstitial fluid (IF). The balance consists of cerebrospinal fluid, lymph, the synovial fluid in the joints, pleural fluid in the pleural cavities (lungs), pericardial fluid around the heart, peritoneal fluid in the peritoneal cavity (abdomen), and the aqueous humor of the eye. In mammals, milk is also considered an extracellular fluid.

The ICF has higher amounts of potassium, phosphate, magnesium, and protein compared to the ECF. The plasma has high concentrations of sodium, chloride, and bicarbonate, but lower levels of protein as compared to the ICF. While water moves passively via osmosis, sodium and potassium ions move in and out of cells using active transport ion pumps. The pumps are powered by adenosine triphosphate (ATP) to provide the energy to move the ions against their concentration gradients (i.e. sodium moves out of the cell and potassium is pumped in) and maintain the gradients inside and outside the cell.

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Answer:

For d I'm pretty sure its Organ System, I apologies if I am wrong

When the enzyme is abundant Option A.increasing the concentration of the reactants will increase the reaction rate.

option A is correct

Enzyme awareness increasing enzyme awareness will speed up the reaction, as long as there may be a substrate to be had to bind to. once all the substrate is sure, the reaction will now not speed up, in view that there can be nothing for added enzymes to bind to.

PH is a chief element affecting the interest of enzymes. The ionization of amino acid molecules and atoms takes place while the pH is altered, thereby affecting the shape and form of proteins and therefore disrupting their activities.

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Answer:

The molar mass of CO2 is 44.01 g/mol, whereas the molar mass of helium is 4.002602, since the mass is so much lighter for the helium it floats upwards because it is less dense than the air around it as well as being less dense than the CO2

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction.

In the case of a burning log, although the log appears to be reduced to ash, the mass is still conserved. When wood burns, it undergoes a chemical reaction called combustion, where it reacts with oxygen from the air to produce carbon dioxide, water vapor, and other byproducts. These byproducts include gases and smoke that are released into the atmosphere, as well as the remaining solid residue, which is ash.

Even though the log is reduced to ash, the total mass of the ash, gases, and smoke produced is equal to the initial mass of the log. The process of combustion converts the wood's carbon, hydrogen, and other elements into different compounds, but the total mass of all the reactants and products remains the same.

Therefore, the law of conservation of mass still applies, ensuring that the total mass before and after the burning of the log remains constant.

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Answer:

yo m ok mama

Explanation:

tjdjsjsjsjwbebsbshsh

Answer:

A. Some of the broken tablet was not added to the water.

B. The tablet was not crushed enough to make a substantial difference.

D. The tablets were not uniform in their mass.

(Photo for proof below.)

Explanation:

All of these things affect the reaction rate of the tablet. Not adding all of the broken tablet will likely slow down the reaction rate. Not crushing the tablet enough may also affect the reaction rate because of surface area. Crushing the tablet more will increase its surface area, since more surface of the tablet is created. This will increase the reaction rate because more exposed area will react with the combined substance. Tablets not being having the same mass may speed up or slow down the reaction rate, depending on whether the tablet is bigger or smaller, since there is more or less of the tablet to dissolve.

Incase you're doubtful of my answers. Here's proof it's on Edge.

The possible sources of the error obtained in the results of different students are ; Some of the broken tablet was not added to the water, The tablet was not crushed enough to make a substantial difference, The tablets were not uniform in their mass.Hence The correct options are (A), (B) and (D)

(Image for correct answer is attached with the answer for reference)

Experimental error is the difference between a measured value and its true value. In other words, it is the inaccuracy or inaccuracies that stop us from seeing an absolutely correct measurement.

Experimental error is very common and is to some degree inherent in every measurement.

Therefore, The possible sources of the error obtained in the results of different students are ; Some of the broken tablet was not added to the water, The tablet was not crushed enough to make a substantial difference, The tablets were not uniform in their mass.Hence The correct options are (A), (B) and (D)

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Answer:

See explanation

Explanation:

If we look at the electron configuration closely, we will discover that the element must have had a ground state electron configuration of 2,4.

This is because, the innermost shell usually holds two electrons while the outer shells hold eight electrons each. The four electrons must be accommodated in the second shell in the ground state configuration of the compound.

However, when the atom is excited, one electron from this shell may move to the third shell to give the excited state configuration 2-3-1 as shown in the question.

It will take 14.13 years for the disintegration rate of this sample to drop to 878 disintegrations per minute.

Given that,

Half life of Sr-90 = 28.49 years

This decay process is first order decay kinetics

So according to \(1^{st}\) order reaction

Half life = 0.693/k

k= 0.693/28.49

k= 0.0243 \(years^{-1}\)

According to the integrated rate law for \(1^{st}\) order reaction

ln[Rn] = ln[Rn]\({o}\) - kt  …..(1)

where, Rn = 878 disintegrations/minute

Rn\(_{o}\) = 1238 disintegrations/minute

Putting the values in equation (1)

ln[878] = ln[1238] - 0.0243 × t

6.7776 = 7.1212 - 0.0243 × t

0.0243t = 0.3436

t= 14.13 years

Hence, it will take 14.13 years for the disintegration rate of this sample to drop to 878 disintegrations per minute.

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Answer:

Explanation:

Here, we want to get the equation of reaction between hydrogen and oxygen

When hydrogen and oxygen react with the ration 2 to 1 in terms of number of moles, water is produced (2 moles of water)

We can show that as follows;

Answer:

This is because Corn is grown on land and has important values to man .These values include as a source of food for man and animals. It is also used as raw materials for the production of certain goods such as flour etc.

It is an energy resource because fermentation of corn gives rise to ethanol fuel which is used as a source of power to run machines and other equipment.