The Law of Conservation of Mass states that if 6 grams react in a chemical reaction, then _____ grams are present after the reaction.
a. 9 grams
b. 12 grams
c. 3 grams
d. 6 grams

a) From the steam table, the specific volume of H2O at 230oC, 5000 kPa is 0.0667 m3/kg.

b) From the steam table, the specific volume of H2O at 200oC, 1000 kPa is 0.8858 m3/kg.

d) From the steam table, the pressure of H2O at 120oC, specific volume 0.5000 m3/kg is 148.68 kPa.

a. To determine the specific volume of H2O at 230oC, 5000 kPa, we can use the steam table to find the specific volume at the given temperature and pressure.

b. To determine the specific volume of H2O at 200oC, 1000 kPa, we can again use the steam table to find the specific volume at the given temperature and pressure.

c. To determine the pressure of H2O at 120oC, specific volume 0.5000 m3/kg, we can use the steam table to find the pressure at the given temperature and specific volume.

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A radioactive substance decreases by 65% each hour. Find the hourly decay factor. The hourly decay factor is 0.35.

Chemicals in the class of radionuclides (also known as radioactive materials) have unstable atomic nuclei. They become stable by undergoing modifications in the nucleus (spontaneous fission, alpha particle emission, neutron conversion to protons, or the opposite).

A radioactive atom will naturally emit radiation in the form of energy or particles in order to transition into a more stable state. The difference between radioactive material and the radiation it emits must be made.

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In order to produce molten iron and carbon dioxide in a blast furnace, the following steps are typically taken:

Place limestone, coal, and iron ore in a blast furnace. (c)

Heat the blast furnace to high temperatures, causing the limestone to break down and release carbon dioxide. (d)

The carbon dioxide reacts with the coal to produce carbon monoxide, which then reacts with the iron ore to reduce it to molten iron. (a)

Pour off the molten iron from the bottom of the blast furnace. (b)

These steps are part of the process of producing iron in a blast furnace, which is a common method used in the production of steel and other iron-based products. It is important to follow proper procedures and safety protocols when working with blast furnaces, as they involve high temperatures and potentially hazardous materials.

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Answer:

wow I can't believe you. your cheating I'm giving you a f on this. unless you tell me in front of the class that you cheated. I'm joking man but seriously I don't know

Benzophenone dissolves in methanol because it forms intermolecular hydrogen bonds with the methanol molecules.

Methanol is a polar solvent, meaning it has a positive and negative end. Benzophenone is also polar, with the carbonyl group (C=O) being the most polar part of the molecule. The oxygen atom in the carbonyl group has a partial negative charge, and the hydrogen atoms in the methanol molecule have a partial positive charge.

This allows for the formation of intermolecular hydrogen bonds between the benzophenone and methanol molecules. These hydrogen bonds increase the solubility of benzophenone in methanol, allowing it to dissolve.

In summary, benzophenone dissolves in methanol due to the formation of intermolecular hydrogen bonds between the polar molecules.

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The balanced chemical equation for the reaction of calcium and sodium chloride is given as follows: Ca + 2 NaCl → CaCl2 + 2 Na.

This reaction results in the formation of calcium chloride and sodium. When solid calcium reacts with aqueous sodium chloride, it forms solid calcium chloride and aqueous sodium as a result of a single-displacement reaction. The chemical reaction can be written as; Ca (s) + 2 NaCl (aq) → CaCl2 (aq) + 2 Na (s) Where, s = solid, aq = aqueous In this chemical equation, one atom of calcium combines with two molecules of sodium chloride, which gives calcium chloride and two atoms of sodium as a product.

The equation is balanced because it shows the conservation of matter. The same number of atoms of each element is on the reactant and product side of the equation. In this reaction, Ca acts as a reducing agent, and NaCl acts as an oxidizing agent, as one electron is lost by the reducing agent, and another is gained by the oxidizing agent. Therefore, the correct balanced equation for the reaction of calcium and sodium chloride is given as above.

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Answer:

15 atoms

increases

Explanation:

10 hydrogen atoms + 5 oxygen atoms = 15 atoms

Answer:

It Is Transitional Energy.

Explanation: I Took The Quiz And Got It Wrong. It Showed That Transitional Energy Was The Correct Answer.

Answer:

heat energy

Explanation:

Using this formula, we can calculate the confidence interval once we have the sample data, without the sample data, it is not possible to provide an accurate confidence interval estimate.

To construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system, we would need the sample data, specifically the number of cell phone users and the number of users who developed cancer. Without the sample data, it is not possible to provide an accurate confidence interval estimate.

However, if we assume that we have the necessary sample data, we can proceed with the calculation. The formula for calculating a confidence interval for a proportion is:

Confidence interval

\(=�^±�×�^(1−�^)�Confidence interval= p^​ ±z× np^​ (1− p^​ )​ ​ where:�^p^​\)

 is the sample proportion (number of users with cancer divided by the total number of cell phone users).

\(�\)

z is the z-score corresponding to the desired confidence level (90% confidence level corresponds to a z-score of approximately 1.645).

\(�\)

n is the sample size (total number of cell phone users).

Using this formula, we can calculate the confidence interval once we have the sample data.

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A hallmark of many ionic compounds is their ability to dissolve in water through a process called hydration. Humidification refers to the process of adding moisture to the air.

The process through which many ionic compounds dissolve in water is called "hydration." This process involves the ionic compound's anions and cations being surrounded by water molecules, leading to the compound's dissolution.Hydration occurs when an ionic compound dissolves in water because the water molecules surround and separate each ion in the crystal lattice. While the negative ends of the water molecules (oxygen atoms) are drawn to the positive ions (cations), the positive ends (hydrogen atoms) are drawn to the negative ions (anions). The ionic molecule can dissolve in water thanks to this hydration process, creating an aqueous solution.

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Answer:

0.0411 kilometre

Explanation:

1 yard = 0.0009144

Answer:

0.0411 kilometre

hope it helps :)

Answer:

an intrinsic characteristic of a particular acid, not related to concentration

Explanation:

this is easy

An intrinsic characteristic of a particular acid is not related to concentration. Hence, option B is correct.

An acid is any substance that tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, and reacts with bases to form salts.

Whereas pH measures the concentration of solvated protons and does not tell us about the intrinsic acidity of chemical species present in solution, electrode potentials tell us about the intrinsic oxidizing power of the species present but provide no information on their concentration.

By the addition of a sufficient amount of redox indicator to a solution, its redox potential can be measured using redox electrodes.

Hence, an intrinsic characteristic of a particular acid is not related to concentration.

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Answer:

sublimation:heat taken in

condensation:heat given out

evaporation:heat taken in

boiling:heat taken in

melting:heat taken in

freezing:heat given out

Processes listed can be classified into two groups based on whether heat is taken in or given out by the particles.Heat is taken in melting,evaporation, sublimation while heat is given out in boiling,condensation and freezing.

Heat taken in by the particles:

1. Sublimation: This process occurs when a substance changes from a solid directly to a gas without passing through the liquid phase. Heat is absorbed to break the intermolecular forces holding the particles in the solid phase.

2. Evaporation: This process happens when a liquid changes into a gas at temperatures below its boiling point. Heat is absorbed from the surroundings to overcome the intermolecular forces between the liquid particles.

3. Melting: Melting occurs when a solid substance changes into a liquid. Heat is absorbed to break the intermolecular forces holding the particles in the solid phase.

Heat given out by the particles:

1. Condensation: Condensation occurs when a gas changes into a liquid. Heat is released to the surroundings as the gas particles lose energy and come together to form liquid droplets.

2. Boiling: Boiling is the process where a liquid changes into a gas throughout its entire volume. Heat is released to the surroundings as the liquid particles gain energy and escape the liquid phase.

3. Freezing: Freezing is the process where a liquid changes into a solid. Heat is released to the surroundings as the liquid particles lose energy and arrange themselves into a regular pattern.

Thus, heat is taken in melting,evaporation, sublimation while heat is given out in boiling,condensation and freezing.

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Answer:

Answer: Neutral substance is a substance that shows no acid or base properties, has an equal number of hydrogen and hydroxyl ions and does not change the colour of litmus-paper. Water, sugar and table salt are common examples of neutral substances.

Acids found in kitchen are present in vinegar and in butter which can be identified their sour taste and bases present are baking soda and milk of magnesia and identified by their soapy touch.

Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds  such as HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.

According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic  acids  depending on the number of protons which are liberated on dissociation.

Acids are widely used in industries  for  production of fertilizers, detergents  batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.

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bam makes a second solution, adding 6.41 g of co(ch3coo)2 to 36.45 ml of h2o. 0.0137moles  concentration of this solution in mole fraction.

The following formula can be used to determine the concentration of the solution in moles:

1. Determine the moles of every dissolved solute in the solution:

Co(ch3coo)2 moles equal 6.41 g / (242.18 g/mol) = 0.0265 mol H2O moles equal 36.45 ml x (1 L/1000 ml) x (55.55 mol/L) = 2.0 mol

2. Total the amount of moles present in the mixture:

total moles = 0.00265 + 0.00265 = 2.0265

3. Dividing the total number of moles in the solution by the amount of each solute

Co(ch3coo) has a 0.0137 mole fraction.

Physical properties, on the other hand, are characteristics that do not alter the chemical makeup of a substance.

Boiling point, melting point, density, etc. are only a few examples of physical qualities.

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Answer:

The temperature at which the vapor pressure of a liquid is just equal to the external ... The conversion of a liquid to a gas below the boiling point is called ... equilibrium temperature of the mixture was 36.0 °C. What is the specific heat (J/ g°C) of the metal

Explanation:

Answer:

10.554 amu

Explanation:

X1 has 10 amu with 72.3%

X2 has 12 amu with 100 - 72.3 = 27.7%

So average mass = 10(72.3%) + 12(27.7%)

= 10(0.723) + 12(0.277)

= 7.23 + 3.324

= 10.554 amu

Answer:

For a reaction when two solutions mix (E). All of these happen.

Explanation:

When two solutions mix and a reaction occurs, it is possible to observe multiple pieces of evidence indicating the reaction. These include:

A. Bubbles are released: The formation of bubbles can indicate the release of a gas during the reaction. This often occurs when a gas is produced as a product of the chemical reaction.

B. Insoluble particles form: The formation of insoluble particles, also known as a precipitate, can occur when two solutions combine to form a solid that is not soluble in the mixture. This can be a clear sign of a chemical reaction taking place.

C. An indicator changes color: Certain chemical reactions involve changes in pH or other properties that can be detected using indicators. An indicator changing color can be indicative of a reaction occurring, particularly if the color change is known to be associated with a specific chemical change.

D. Heat is produced: Some chemical reactions are exothermic, meaning they release heat energy. If the mixing of the solutions leads to a noticeable increase in temperature, it can be a sign that a reaction has occurred.

In summary, all of the given options (A, B, C, D) can serve as evidence for a reaction when two solutions mix. These observable changes provide valuable clues in identifying the occurrence of a chemical reaction.

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Answer:

The scientists should best deal with this measurement by stating that there was an error during measuring and collect further data.

Answer:

I think the answer is D, but if I'm wrong PLEASE TELL ME!

Explanation:

For one hurricane to form, there needs to be warm ocean water and moist, humid air in the region. When humid air is flowing upward at a zone of low pressure over warm ocean water, the water is released from the air as creating the clouds of the storm. As it rises, the air in a hurricane rotates.

The body's pH levels vary across different systems, with the stomach having an acidic pH of 1.5-4 and the duodenum having a more alkaline pH of up to 8.5.

Our body's pH levels play a crucial role in maintaining proper functioning and balance. The stomach is responsible for breaking down food through the secretion of gastric acid, which creates an acidic environment necessary for digestion. The pH range of 1.5-4 in the stomach is highly acidic, enabling the enzyme pepsin to break down proteins efficiently. This acidic environment also helps to kill harmful bacteria and pathogens that may enter the body through food or drinks.

On the other hand, the duodenum, which is the first part of the small intestine, has a higher pH level, typically ranging from 7.5 to 8.5. The release of bile and pancreatic juices into the duodenum helps to neutralize the acidic content coming from the stomach. These secretions contain bicarbonate ions that raise the pH level, creating a more alkaline environment. This alkaline environment is essential for the optimal activity of enzymes in the small intestine, enabling the digestion and absorption of nutrients from food.

The contrasting pH levels between the stomach and duodenum highlight the body's ability to maintain a delicate balance. The acidic environment of the stomach is necessary for efficient digestion and protection against pathogens, while the alkaline environment of the duodenum allows for proper nutrient absorption. This pH regulation is a testament to the intricate systems at work in our bodies to ensure overall health and well-being.

If the pH of the stomach and the duodenum were switched, it would disrupt the normal digestive process and could lead to various health complications.

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The correct answer is (a) isotopes.

Isotopes are two or more atoms of the same element that have the same number of protons but differ in the number of neutrons they contain. Since the number of protons determines the element's identity, isotopes of an element have identical chemical properties. However, due to the difference in the number of neutrons, isotopes may have slightly different atomic masses.

Let's break down the answer choice and explain each option:

(a) Isotopes: This is the correct answer. Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons.

(b) Ions: Ions are atoms or molecules that have gained or lost electrons, resulting in a net positive or negative charge. This is not the correct term for atoms differing in neutron number.

(c) Anions: Anions are negatively charged ions that have gained electrons. This is not the correct term for atoms differing in neutron number.

(d) Isomers: Isomers are compounds that have the same molecular formula but different structural arrangements. This is not the correct term for atoms differing in neutron number.

Therefore, the correct term for two atoms that differ only in the number of neutrons they contain is (a) isotopes.

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Answer:

lol im sorry man

Explanation:

Answer:

My old acc got banned

Explanation:

Answer:

the answer is C.

Explanation:

Answer: I think the answer would be C

Explanation: The answer is C because of the fact that mixtures are 2 or more substances that are combined and they will have several different types of substances and other chemicals in there. Also if you have a mixture well then it probably will have more than just 1 different kind or different types of properties inside of the mixture and inside the substances as well. If you do have a chemical change or chemical reaction then that can indeed separate any or maybe even all of the different molecules and the mixtures as well. Hoped i helped:)

Answer:

We know that,

Density= mass upon volume.

mass= 21.93g

Volume= 49.3 - 46.3

= 3 cm³

Density = 21.93÷ 3

= 7.31 g/cm³

Hope it helps :))

A piece of indium with a mass of 21.93 g is submerged in 46.3 cm³ of water in a graduated cylinder. The water level increases to 49.3 cm³. The correct value for the density of indium measured in g/cm3 from these data is 7.31 g/cm³.

The density of a material is defined as its mass per unit volume. Although the Roman letter D can also be used, the most common symbol for density becomes. Mathematically, density is calculated by dividing weight by volume.

Density is frequently loosely defined as weight per unit volume, which is technically wrong; this quantity is actually more accurately characterized as specific weight. One example is the oil and gas industry in the United States.

Density= mass/volume.

mass= 21.93g

Volume= 49.3 - 46.3

           = 3 cm³

Density = 21.93÷ 3

            = 7.31 g/cm³

Therefore,  7.31 g/cm³ is the density.

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Answer:

The balanced chemical equation for the reaction is:

C + 2H2 → CH4

From the equation, we can see that 1 mole of carbon reacts with 2 moles of hydrogen to produce 1 mole of methane. Therefore, to produce 7.8 moles of methane, we would need:

1 mole of carbon = 1 mole of CH4 / 2 moles of H2 = 1/2 mole of CH4

7.8 moles of CH4 = 7.8 × (1/2) moles of C = 3.9 moles of C

Now, we can use the molar mass of carbon to convert moles to grams:

Atomic mass of carbon (C) = 12.01 g/mol

3.9 moles of C × 12.01 g/mol = 46.8 g of C

Therefore, we need 46.8 grams of carbon to produce 7.8 moles of methane (CH4). Rounded to the nearest tenth, the answer is 46.8 grams.

Answer:

Go to the bottom-right corner of your taskbar, then click the Volume Control icon. A small window will pop up, and it will offer access to the volume level control. Slide the bar to set the volume to your preferred level. This may be one of the quickest and easiest ways to change the volume level of your computer.

to answer all three of those in one sentence; Potassium is an element used in the body for some functions, it is commonly found in bananas.

Answer:

Blank 1 - Microscope

Blank 2 - Cell Theory

Explanation:

Answer:

microscope. and cell theory

Explanation:

with the invention of the microscope. scientists were able to create cell theory