Iodine has 53 protons and 74 neutrons: what is the atomic number? What is the atomic mass?

The net force on an object can be zero even with multiple forces acting on it if the sum of all forces is zero and their vector components cancel each other out, indicating a state of equilibrium.

If there are many forces acting on an object, the net force can be zero if the vector sum of all these forces is equal to zero. This concept, described by Newton's first law of motion, means that the forces are balanced, and thus the object is in a state of equilibrium. When forces are balanced, their vector components cancel each other out in all directions, which is expressed as net Fx = 0 and net Fy = 0. For instance, when a car is moving at a constant velocity or is parked, frictional force balances out drag force or gravity, ensuring that no acceleration occurs, and hence the net force is zero.

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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Answer:

d

Explanation:

The gravitational force between two objects will decreases as the distance between them increases. Hence, if the moon goes far, The gravitational pull between the moon and earth would decrease.

The gravitational force is the force by which an object attracts other object into its center of mass. The gravitational force depends on the masses of the objects and distance between them by the equation written below:

Fg = G m1 m2/r²

where G is the universal gravitational constant equal to 6.67 × 10⁻¹¹ N/kg²m²

Earth pulls every object into its ground by gravitational force. When we move out of earth's surface we feels a weightlessness  due to the decrease in gravitational pull.

Moon keeps its orbiting around earth because  experience a gravitational pull from earth. When moon goes far from earth, this gravitational pull will decrease. Hence, option C is correct.

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Answer: The correct answer is Option A.

Explanation:

For the given options:

Mixtures are defined as the solution win which components are mixed in indefinite proportions. Every substance retain their individual chemical properties.

Atoms are defined as the smallest unit which cannot be further divided.

An element is defined as the substance which is made of similar kind of atoms. All the atoms in an element have same atomic number.

According to the question:

A bowl has flour and sugar init. Both the compounds have their individual properties retained. Thus, they are forming a mixture.

Hence, the correct answer is Option A.

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:

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.

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:)

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:

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

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.

Hope this helps!

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.

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.

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:

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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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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The correct answer to this open question is the following.

The term that defines the smallest piece of a crystal that shows the shape of that type of crystal is "unit cell."

In the atomic world, the smallest portion of a crystal lattice is a unite cell. A unit cell shows the 3D or three-dimensional pattern of the crystal. So this unite cell can repeat itself to form the crystal lattice. There are cubic cells, monoclinic cells, tetragonal cells, orthorhombic, cells, and rhombohedral cells.