If the moon were twice as far from earth as it now , which of the following would be true?

A . Earth's gravitational pull on the moon would be the same as it is now because distance does not affect earth's gravity.

B . The gravitational pull would be zero.

C . The gravitational pull between the moon and earth would decrease because the distance between the moon and earth would have increased.

D . The gravitational pull between the moon and earth would be the same because their masses has not changed.

Answer:

78 g of potassium

Explanation:

According to Lavoisier's Law, the sum of the mass of the products must be equal to the sum of the mass of the reactants.

On the reaction we have potassium oxide as product (K2O) and as reactants potassium (K) and Oxygen (O2)

Having sayin this, the reaction must be as follows:

K + O2 -> K2O

We need to balance the equation  to have the same amount of molecules of each element in each side:

4K + O2 -> 2K2O

Taking into account the  molar mass of each compound, the reaction can also be written:

4(39g/mol) + 1(32g/mol) -> 2(94g/mol)

solving the  multiplications we have that:

156g of K + 32g of O2 -> 188g of K2O

therefore, we need 78 g of K to obtain 94 g of K2O with 16g of O2

Igneous rocks that form on Earth's surface when lava cools are known as extrusive or volcanic igneous rocks. They are fine-grained, leading to a duller appearance due to their rapid cooling.

Igneous rocks that form when lava cools on Earth's surface are called extrusive igneous rocks. These rocks are also known as volcanic igneous rocks and are characterized by their fine-grained texture because they cool quickly, which doesn't allow for large crystals to form. The quick cooling on the Earth's surface leads to the fine-grained structure that causes these rocks to look dull and to sparkle less as compared to their intrusive counterparts. Basalt is one of the most common types of extrusive igneous rocks, often formed from basaltic lava in volcanic eruptions.

Final answer:

Extrusive igneous rocks, also known as volcanic igneous rocks, are formed when lava cools on Earth's surface. These rocks have small crystals and a dull appearance.

Explanation:

When lava cools on Earth's surface, it forms extrusive igneous rocks. These rocks are also known as volcanic igneous rocks. Extrusive igneous rocks cool quickly on the surface and have very small crystals, which give them a dull appearance.

Ash can have a big impact on the energy cycle!

Lots of ash from a volcano will block the sun, meaning sunlight isn't able to get to the producers that create energy from it.

Consumers would begin to suffer as producers can make any energy for them to consume. This pattern goes all the way through the food chain. Each level is affected by lack of food because of the ash in the sky.

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A ship rises higher in the water when it is unloaded due to a decrease in the density of the ship and its cargo. The unloaded ship has a lower mass relative to its volume, which means it displaces less water and thus floats higher, according to Archimedes' principle and the principle of flotation.

As a ship is unloaded, it rises higher in the water because the density of the ship and its cargo decreases. This change in density is related to Archimedes' principle, which states that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid that the object displaces. When a ship is loaded with cargo, its overall density is higher, and it displaces more water, causing it to sink lower in the water. As cargo is removed, the ship's mass decreases while its volume remains constant, thus lowering the average density. Since the ship has a lower density, it displaces less water and therefore rises higher in the water.

The fraction submerged is the ratio of the volume submerged to the volume of the object. When the ship is unloaded, this ratio decreases, indicating less of the ship's volume is submerged. According to the principle of flotation, a floating object will displace a weight of fluid equal to its own weight. As the weight of the ship decreases when being unloaded, the volume of water it needs to displace to maintain this equilibrium also decreases, resulting in the ship rising.

An atomic nucleus possesses nuclear, chemical, and electrical potential energy. Nuclear energy relates to changes within atomic nuclei, while chemical energy is stored in chemical bonds. Electrical energy corresponds to the position or separation of charged particles.

When we talk about an atomic nucleus, we typically refer to three forms of potential energy: nuclear potential energy, chemical potential energy, and electrical potential energy. Each type of energy relates to the position, configuration, or state of the object and can be seen in various systems.

Nuclear potential energy is the energy possessed due to changes within atomic nuclei, such as the fusion of two light nuclei or the fission of a heavy nucleus. Chemical potential energy is energy stored in chemical bonds, which hold the atoms together in a molecule or compound through electrical forces. Bond-forming always releases energy, and bond-breaking absorbs the same energy.

Lastly, electrical potential energy relates to the position or separation between charged particles. The attraction between oppositely charged particles, such as in the atomic nucleus, represents this form of potential energy.

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1. Increase the temperature  

2. Increase the pressure of an reacting gas  

3. Solid reactants are broken into smaller pieces

4. The concentration of a dissolved reactant is increased.

Answer: Answer is the mantle. Because I did that on USA Test Prep.

Explanation:

Answer: Option (3) is the correct answer.

Explanation:

A reaction due to which there occurs change in chemical composition of reactants is known as a chemical reaction.

For example, evolution of heat when two substances combine together shows a chemical reaction has taken place between the substances.

Whereas a reaction which does not bring any changes in chemical composition of the reactants is known as a physical reaction.

For example, boiling point, melting point, mass, volume etc are all physical properties.

Thus, we can conclude that out of the given options a substance melts when sitting in the Sun, is not an indication of a chemical reaction.

Answer:

Explanation:

Answer:

Use solubility

Explanation:

Salt will dissolve in water while sand will not.

Dissolve the mixture of sand and salt in water, make sure all salt is dissolved. Filtrate the solution a couple of times and use vacuum filtration at the end to obtain a clear solution. At this point you will have wet sand and a salty solution. Take the salty solution and evaporate water to obtain the salt.

Sugars such as glucose, fructose, and ribose are examples of carbohydrates. Therefore, the correct option is option C.

Class of substances that occur naturally and derivatives created from them known as carbohydrates. Early in the 19th century, it was discovered that materials like wood, starch, as well as linen were primarily made of molecules with the general formula C6H12O6, which contained carbon atoms (C), hydrogen (H), as well as oxygen (O). It was also discovered that some organic compounds with similar formulas had a similar percentage of hydrogen to oxygen.

The most prevalent and widely distributed organic material in nature, carbohydrates are a necessary component of all living organisms. Sugars such as glucose, fructose, and ribose are examples of carbohydrates.

Therefore, the correct option is option C.

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Answer:

There is 40*10⁻¹² g (or 4 * 10⁻¹¹ g) solute in one liter of solution

Explanation:

Concentration measured in very small levels is expressed in terms of ppt i.e. parts per trillion which is the amount (grams) of solute present in a liter (L) volume of solution

[tex]1 ppt = 1*10^{-12} g\ solute/L\ solution\\[/tex]

The concentration of salt in the aquarium is 40 ppt

This implies that there is 40*10⁻¹² g salt in one liter of the solution

Answer:

-change in size and shape of a substance

-change in phase of a substance

-change of appearance  

-expansion or contraction of a substance

sorry I'm late lol, hopes this helps someone:)

Some of the valuable information and inventions that were made by failed experiments are:

Wilson Greatbach made a mistake while building a heart rhythm recording device, he pulled out the wrong sized resistor and plugged it into the circuit. When it was installed he realized it sounded like a human heartbeat. With a bit more modifications the result was an implantable pacemaker, which has since saved thousands of lives.

In 1856, dyes were made from natural materials - and 18-year-old chemist William Perkin creating an artificial version of the malarial drug, quinine. Unfortunately, his experiments went wrong, leaving behind a dark, oily sludge, a color more vibrant than he’d seen before. He got Nobel Prize for it which was called a synthetic dye.

Sir Alexander Fleming was conducting experiments to discover a “wonder drug” to treat a variety of diseases when he noticed an unknown fungus growing in a discarded Petri dish. This strange fungus was dissolving the surrounding bacteria. Fleming lately came to know that he had unintentionally found one of the most important drugs for treating infections for which he got Nobel Prize.

The Heat will flow from the region of Higher temperature towards tthe region of lower temperature.

The study of the relationships between heat, work, temperature, and energy is known as thermodynamics.

The laws of thermodynamics describe how energy changes within a system and determine whether a system can use its surroundings to perform useful work.

Thermal radiation, thermal conduction, thermal convection, and phase shifts are a few examples of the several types of heat transport processes.

Heat flow happens when a hot object transfers its heat through a conductor to a cold object, much like how high-energy entities transfer their energy to low-energy objects.

Therefore, The Heat will flow from the region of Higher temperature towards tthe region of lower temperature.

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Continents and oceans are carried on tectonic plates - segments of the Earth's crust and upper mantle - which move due to heat convection in the mantle. This movement leads to the formation of subduction zones and other geological features and events. The process serves as a cooling system for Earth.

The Earth's crust and upper mantle, up to a depth of about 60 kilometers, are divided into massive segments called tectonic plates. These tectonic plates, carrying the continents and oceans, fit together like a jigsaw puzzle and move due to the slow convection of the mantle - the process of heat transport by the upward flow of warmer material and the downward flow of cooler material.

Plates move at an average speed of about 4 to 5 centimeters per year, similar to how your hair grows. When two plates converge, one often subsides beneath the other forming a subduction zone. This process is crucial in forming marvelous geographical features such as trenches, mountain ranges (like the Alps due to the collision between the African and Eurasian plates), and more.

Plate tectonics is indeed a significant mechanism for Earth's heat transportation - acting as a cooling system for the planet. All these motions lead to various geological events such as earthquakes, volcanic eruptions, and continental drift.

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