How do you know if a reaction is endothermic?

To compare a substance physically,  different methods have been applied like measure the dimensions of an object, calculation of volume. physical property also tell you whether the substance is a solid, liquid, or a gas.

Chemical properties of a substance  can be measured when a substance undergoes any type of chemical change where as Physical properties does not require any chemical changes, it can be directly observed.

A chemical reaction is conducted to show the chemical property of a substance where as no chemical reaction is required to determine the physical property.

In Chemical properties the compounds are connected by the chemical bonds  while in Physical properties the compounds do not show such a relationship.

Some of the Chemical properties include Compressibility, flammability,  toxicity, radioactivity while physical properties include Molecular weight, melting point,  length, color, odor, shape.

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The people of chungungo need to use nets to catch moisture in the air to capture the water droplets present in the environment and collect the water for various uses.

The moisture in the air is the tiny water droplets that are present in the environment or in the air it is mostly present in the cold zone of the environment.

The chungungo is a desert coast area and their is lot of the shortage of the water in their areas and the chances of rain is very low so the people of there use the net to capture the water drops from the air.

Therefore, people of chungungo need to use nets to catch moisture in the air to capture the water droplets present in the environment and collect the water for various uses.

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Final answer:

The people of Chungungo use nets to capture moisture from the air due to limited fresh water sources in their region. This technique is a form of atmospheric water collection and has historical precedence dating back to the Old Stone Age.

Explanation:

The people of Chungungo needed to use nets to catch moisture in the air because they inhabit an area with limited access to fresh water. This innovative method allows them to collect water from fog and mist, which is especially valuable in arid or semi-arid regions where rainfall is scarce. Using nets as a form of atmospheric water collection is an ancient technique with roots tracing back to the Old Stone Age, as evidenced by archaeological findings similar to the limestone “sinkers” from the Maedun cave in South Korea, which date to 27,000 BC. These sinkers were tied to nets to catch small fish in streams, showcasing the long history of using nets for various forms of capturing and harnessing natural resources.

Xenon does not typically form a monatomic ion.

In this question, we need to identify the element that does not form a monatomic ion. A monatomic ion is an ion consisting of only one atom.

Potassium (K) forms a monatomic ion with a charge of +1, sulfur (S) can form a monatomic ion with a charge of -2, and chlorine (Cl) can form a monatomic ion with a charge of -1.

However, xenon (Xe) does not typically form a monatomic ion. Xenon belongs to the noble gas family and is highly stable due to its full valence electron shell, so it rarely forms ions.

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The answer is actually False.

Answer:

FALSE

Explanation:

I got the question correct.

Answer: Option A

Explanation:

The osmosis can be defined as a biological process where the movement of the particles takes place through the semipermeable membrane.The solvent moves from a region of high concentration to low concentration.

The diffusion is same in the reference that it can also occur through the semipermeable membrane.

The particles from the higher concentration moves towards the lower concentration.

Hence, option A is correct.

Final answer:

The solubility of KCl in ethanol is 0.25 g/100 mL at 25°C. Compared to the solubility of KCl in water, KCl is much more soluble in water than in ethanol.

Explanation:

The solubility of KCl in ethanol is 0.25 g/100 mL at 25°C. This means that at this temperature, 0.25 grams of KCl can dissolve in 100 mL of ethanol. Comparing this to the solubility of KCl in water, we can see that the solubility of KCl in water is generally much higher. While the solubility of KCl in ethanol is 0.25 g/100 mL, the solubility of KCl in pure water at 25°C is 27.8 g/100 mL. Therefore, KCl is much more soluble in water than in ethanol.

Answer:

C. smiling when you're happy

Explanation:

SInce it's just an emotion and isn't actually that nessary

A physical propery of halite (table salt) is its chemical composition.

The answer is C. X: Benefits

Y: Risks

Answer:

x benefits y risks

Explanation:

Answer:

its is a subtance

Explanation:

ifff im wrong im soooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo sorry.# i wasted my time on that lol.

Coffee is considered a mixture rather than a pure substance because it is made up of multiple components that can be separated. Coffee is a mixture, not a pure substance, due to the variety of components that combine to make it, such as caffeine, water, oils, and other organic compounds.

In chemistry, coffee is considered a mixture rather than a pure substance. A mixture is a combination of two or more substances that are not chemically joined together. Coffee is made up of various components such as water, caffeine, oils, and flavor compounds, which can all be separated through various methods.

For example, if you were to run a coffee extraction process using water, you would separate the soluble components of coffee from the insoluble ones. This demonstrates that coffee is not chemically pure but rather a mixture.

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The statement is true; models are used to represent complex systems that are difficult to study directly, such as subatomic particles or large-scale environmental processes.

Making models involves creating representations of complex objects or processes to help people study and understand things that cannot be observed directly. The correct answer to the student's question is A. True.

Scientific models are simplified versions of a part of the real world that help us understand, analyze, and predict behaviors of complex systems. These models can take the form of physical constructions, mathematical equations, computer programs, or simulations. For instance, atomic models allow us to visualize and understand the structure of an atom, even though atoms are far too small to be seen with the bare eye.

Models are particularly beneficial in fields like physics, where phenomena at very small scales or very high speeds occur, which are beyond human perception. However, it is essential to acknowledge that models are approximations and are not as detailed as the real phenomena they represent, and it's important to understand their limitations.

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For ages 14-18, young adult romance novels are popular, often blending aspects of realism and romanticism. Examples include books like 'Twilight', 'The Fault in Our Stars', and 'Divergent'. These novels provide relatable plots and characters while offering an escape into various genres like fantasy, mystery, and dystopian fiction.

Teenagers between the ages of 14-18 often lean towards young adult romance novels that incorporate elements of fantasy, mystery, and realism. Two popular categories of stories that these novels might follow are romance and the bildungsroman, a genre focusing on the growth of its main character, fitting given the phase of life teenagers are in.

For example, 'Twilight' by Stephenie Meyer that offers a blend of romance and fantasy with the main characters being a teenage girl and a vampire, set in contemporary times. Other examples are 'The Fault in Our Stars' by John Green, a poignant love story between two teenagers met at a cancer support group, and 'Divergent' by Veronica Roth that blends romance with dystopian fiction.

The beauty of these novels is they take variations from the type of normal life (romanticism) and incorporate them into real life settings (realism). These stories provide young readers an escape from their day-to-day lives, while also offering relatable plots and characters that they can connect with on a personal level. Regardless of whether the novels have elements like magic, vampires, or talking animals, the primary focus rests on the exploration of human emotions, friendships, and romances, imparting a sense of both imagination and reality.

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The maximum number of electrons that can occupy the principal quantum number 5 is 50, calculated using the formula 2n² where n is the principal quantum number.

The maximum number of electrons that can occupy the fifth energy level (n = 5) of an atom is determined by the formula 2n2. For n = 5, this formula gives:

2 × 52 = 2 × 25 = 50 electrons

Therefore, the maximum number of electrons that can occupy the principal quantum number 5 is 50. This includes the possible subshells in that energy level: 5s, 5p, 5d, and 5f, with the number of orbitals in each subshell being one s-orbital, three p-orbitals, five d-orbitals, and seven f-orbitals, respectively.

Mixture is homogeneous in case when lemon juice is filtered. But if it is not properly filtered and contains pulp or seed then the resultant mixture would be the heterogeneous.

Mixture are created using two or more chemical substances. If all the substances in the mixture are in the same phase then it would be a homogeneous mixture else if two substances that differ in a phase from the mixture it is a heterogeneous mixture.

For example freshly squeezed lemon juice, water and mixture of a sugar is homogeneous when lemon is properly filtered because all are present in a same phase.

When Sherry combined water, lemon juice, and sugar in a pitcher, she created a homogeneous mixture, a combination of substances that are uniformly mixed together.

Sherry has made a homogeneous mixture when she combined water, lemon juice, and sugar in a pitcher. A homogeneous mixture, also known as a solution, is a combination of substances with a composition that is uniform throughout. For example, when sugar is stirred into a glass of water, it dissolves in the water and the sugar molecules are evenly distributed throughout the mixture, making it homogeneous. In contrast, a heterogeneous mixture is a combination of substances whose composition can vary from point to point because the substances do not thoroughly mix; an example would be oil and vinegar salad dressing.

A homogeneous mixture is a combination of substances with a composition that is uniform throughout. Sherry's combination of water, lemon juice, and sugar in a pitcher would be considered a homogeneous mixture because the components are evenly distributed and the mixture appears uniform.

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To solve such this we must know the concept of double displacement reaction. Therefore, the mass of oxygen is 27.2g when 20.4g of magnesium react with 34.0g of magnesium oxide.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

The balanced reaction is

2Mg+ O [tex]_2[/tex][tex]\rightarrow[/tex]2MgO

mass of Magnesium =20.4g

Molar mass of magnesium =24gmol

moles of magnesium =0.85moles

moles of magnesium = moles of oxygen =0.85moles

Mass of oxygen =Molar mass of oxygen ×moles of oxygen

                           =32g/mol×0.85moles

                          =27.2g

Therefore, the mass of oxygen is 27.2g.

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freezing-energy lost (exothermic)

sublimation-energy gain (endothermic)

evaporation- energy gain(endothermic)

Melting- energy gain(endothermic)

deposition- energy lost(exothermic)

condensation-energy lost(exothermic)

Answer:

freezing-energy lost (exothermic)

sublimation-energy gain (endothermic)

evaporation- energy gain(endothermic)

Melting- energy gain(endothermic)

deposition- energy lost(exothermic)

condensation-energy lost(exothermic)

Answer:

The correct answer is "sediment".

Explanation:

A sediment is defined as a solid material that settles down to the bottom of a liquid. Sand grains, pebbles, mud, shells, and leaves are all examples of sediment. The size of a sediment variables from small particles that could be of 2 millimeters (in the case of sand grains), to particles as large as 250 millimeters (in materials such as cobble).

Final answer:

To find the volume of 1.25 M H₂SO₄ solution needed for 36 grams of H₂SO₄, calculate the moles of H₂SO₄ and divide by the molarity. Martha should use approximately 294 ml of the solution.

Explanation:

To determine the volume of 1.25 M H₂SO₄ solution Martha should use to obtain 36 grams of H₂SO₄, we must first calculate the number of moles of H₂SO₄ in 36 grams.

The molar mass of H₂SO₄ is (2×1.01) + 32.07 + (4×16) = 98.09 g/mol. Therefore, the number of moles of H₂SO₄ is:

Number of moles = Mass / Molar mass
Number of moles = 36 g / 98.09 g/mol
Number of moles ≈ 0.367 mol

Next, we use the molarity of the solution to find the volume needed:

Molarity (M) = Moles of solute / Volume of solution in liters (L)

Therefore, Volume of solution = Moles of solute / Molarity
Volume of solution = 0.367 mol / 1.25 M
Volume of solution ≈ 0.294 L

Finally, to convert liters to milliliters we multiply by 1000 ml/L:

Volume of solution ≈ 0.294 L × 1000 ml/L = 294 ml

Martha should use approximately 294 ml of the 1.25 M H₂SO₄ solution to get 36 grams of H₂SO₄.

The coefficients balance the equation with respect to the law of conservation of mass.

So, from this, we can conclude that the coefficients balance the equation with respect to the law of conservation of mass.

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Answer: Only energy can enter or exit a closed system

Explanation: Apex

The mass and energy in a closed system did not change, it conserved. In a  reaction, the mass of the reactant will be equal to the mass of the product.

A closed system is a thermodynamic system, in which there is no transfer of energy and mass with the outer environment. There is no change in a system to take place.

Thus, the mass and energy in a closed system did not change, it conserved. In a  reaction, the mass of the reactant will be equal to the mass of the product.

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Answer:

Six thousand

Explanation:

The Ussher sequence is a seventeenth century order of the historical backdrop of the world detailed from a strict perusing of the Old Testament by James Ussher, the Archbishop of Armagh.  

Priest James Ussher, a 17th-century Anglican pastor and scriptural researcher had the appropriate response. aaccording to him, in a 1658 sequence titled The Annals of the World, God made the world on October 23, 4004 BCE which accounts for 6000 years for the age of the earth.

Its not D, im not quite sure but if you have to guess then choose ab or c

C. Is your Answer (Solute)

Took The Test

Answer: Option (b) is the correct answer.

Explanation:

A chemical reaction is the one in which there occurs change in the chemical composition of a substance in order to result in the formation of a new compound.

For example, when sugar burns then it means it is chemically reacting due to which it turns into black.

On the other hand, a physical change is the one in which there occurs no change in chemical composition of a substance. As a result, no new compound is formed.

For example, Paper absorbs liquid and sinks, Water boils and evaporates, and  Glass vibrates and shatters are all physical changes.

Thus, we can conclude that sugar burns and turns black correctly identifies a scenario that displays evidence a chemical reaction is occurring.

Animal

Explanation:

e  e e e e  e e e e e e e e e e  e e e.