Is gold a rock :)...........

Answer:

are those numbers the atomic mass?

Explanation:

The number of protons, neutrons, and electrons for the atoms Zr, Hg, Ni, and Rn correspond to their atomic numbers and mass numbers, with Zr having 40 of each proton and electron and 50 neutrons, Hg with 80 of each proton and electron and 122 neutrons, Ni with 28 of each proton and electron and 30 neutrons, and Rn with 86 of each proton and electron and 136 neutrons.

To determine the number of protons, neutrons, and electrons in an atom, you need to know its atomic number (which is the same as the number of protons and electrons in a neutral atom) and its atomic mass number (which is the sum of protons and neutrons). Here's how to calculate them for each of the given isotopes:

Zirconium (Zr), with an atomic number of 40 (90Zr), has 40 protons, 40 electrons, and 50 neutrons (90-40).

Mercury (Hg), with an atomic number of 80 (202Hg), has 80 protons, 80 electrons, and 122 neutrons (202-80).

Nickel (Ni), with an atomic number of 28 (58Ni), has 28 protons, 28 electrons, and 30 neutrons (58-28).

Radon (Rn), with an atomic number of 86 (222Rn), has 86 protons, 86 electrons, and 136 neutrons (222-86).

Final answer:

Newton's three laws of motion are fundamental principles in classical mechanics, explaining how objects behave under various forces. The first law, or law of inertia, says objects maintain their state of motion unless acted upon by an external force. The second law relates force, mass, and acceleration, while the third law states that every action has an equal and opposite reaction.

Explanation:

Isaac Newton's three fundamental laws of motion form the basis for classical mechanics, describing the relationship between a body and the forces acting upon it. The laws are integral to our understanding of interactions and forces in physics.

Newton's first law, also known as the law of inertia, asserts that an object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity unless acted upon by an external force. Newton's second law advances this concept by stating that the acceleration of an object is directly proportional to the net force acting upon it and inversely proportional to its mass. Lastly, Newton's third law establishes that for every action, there is an equal and opposite reaction, meaning that forces between two interacting objects are equal in magnitude and opposite in direction.

Answer:

For A: The elements having similar chemical properties as of iodine are fluorine and bromine.

For B: The elements having similar chemical properties as of barium are magnesium and calcium

For C: The elements having similar chemical properties as of iron are ruthenium and osmium.

Explanation:

In a periodic table, elements are arranged in 18 vertical columns known as groups and 7 horizontal rows known as periods.

Elements arranged in a group show similar chemical properties because of the presence of same number of valence electrons.

For A:  Iodine

Iodine is present in Group 17 of the periodic table. The elements present in this group are Fluorine, Chlorine, Bromine, Iodine and Astatine.

The elements having similar chemical properties as of iodine are fluorine and bromine.

For B:  Barium

Barium is present in Group 2 of the periodic table. The elements present in this group are Beryllium, Magnesium, Calcium, Strontium, Barium and Radium.

The elements having similar chemical properties as of barium are magnesium and calcium

For C:  Iron

Iron is present in Group 8 of the periodic table. The elements present in this group are Iron, Ruthenium, Osmium and Hassium.

The elements having similar chemical properties as of iron are ruthenium and osmium.

Elements belonging to the same group have similar chemical properties. Hence elements that have similar chemical properties with the listed elements are :

Iodine belong to Group 7 on the periodic table, also called the halogen group, similar elements include chlorine, Fluorine and Bromine

Barium belongs to group 2 on the periodic table, other group 2 elements which have the same chemical properties are Calcium, Magnesium, Radium, Beryllium

Iron being group 8 and share similar chemical properties with ruthenium, Osmium and Hassium.

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Answer:

ok so the answer is 6×12÷24= THE Answer if u were look for this

Explanation:

SO IN KHAN I DID IT AND I GOT IT RIGHT

THX PERSON

Answer:

An example of a chemical reaction that occurs at a very slow rate is:

A. Iron Rusting.

Explanation:

1. Iron rusting is a slow chemical reaction that occurs over time when iron is exposed to oxygen and moisture in the air.

2. The process of rusting involves the formation of iron oxide on the surface of the iron, which gives it a reddish-brown color.

3. This reaction occurs gradually, as the iron molecules react with oxygen and water molecules in the environment, leading to the formation of rust.

Therefore, out of the options provided, iron rusting is the best example of a chemical reaction that occurs at a very slow rate.

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Organisms maintain homeostasis to ensure the optimal functioning of cellular processes, enabling them to adapt to various environmental conditions and maintain internal stability necessary for survival.

Organisms need to maintain homeostasis to ensure that their cellular processes occur under optimal conditions. Through homeostasis, organisms maintain internal equilibrium by adjusting biological processes, despite external environmental changes. This is vital for survival, as it enables cells to function correctly and supports overall health and stability.

For example, thermoregulation is a form of homeostasis that helps organisms regulate their body temperature. Polar bears have adapted to cold climates with features like fur and blubber to conserve heat, while in hot climates, humans perspire and dogs pant to release excess body heat.

Furthermore, organisms use feedback mechanisms to regulate growth, reproduction, and to maintain a dynamic homeostasis. These mechanisms provide a way to respond and adjust to changes, ensuring that internal conditions remain within a narrow, favorable range.

Part 1 : Answer is only B substance is soluble in water.

In this experiment undissolved mass of each substance was measured. According to the given data, undissolved mass of substance B at 20 °C is 10 g while A is 50 g. Since, the initial added mass of each substance is 50 g, we can see that substance A is not soluble in water since the undissolved mass is 50 g.

Part 2 : Substance A is not soluble in water and substance B is soluble in water.

According to the given data, the undissolved mass of substance A remains as same as initial added mass, 50 g throughout the temperature range from 20 ° to 80 °C. Hence, we can conclude that substance A is not soluble in water.

But, according to the data, undissolved mass of substance B at 20 °C is 10 g. That means, 40 g of substance B was dissolved in water. When the temperature increases the undissolved mass of substance B decreases. Hence, we can conclude that substance B is soluble in water and solubility increases with temperature.

The density of a substance is calculated by dividing its mass by its volume. For the aluminum block in question, its density is calculated by dividing its mass (40.5 g) by its volume (15.0 mL), yielding a density of 2.7 g/mL.

The subject of this question is density, which is a property of matter defined as mass per unit volume. In this case, you have been given the mass of the aluminum block (40.5 g) and its volume (15.0 mL). To find the density, we simply divide the mass by the volume.

The formula we use is: Density = Mass/Volume.

Therefore the density of the block is 40.5 g divided by 15.0 mL, which results in a density of 2.7 g/mL. So, the density of the aluminum block is 2.7 g/mL.

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The hydrocarbon with the empirical formula C3H8 is Propane, a saturated hydrocarbon that belongs to the alkane family.

The hydrocarbon with an empirical formula of C3H8 is Propane. The empirical formula provides the simplest, reduced ratio of elements within a compound. In the case of C3H8, this represents 3 carbon atoms to 8 hydrogen atoms, which is the formula for propane. Propane is a member of the alkane family of hydrocarbons, which are characterized by single bonds between the carbon and hydrogen atoms, therefore classified as saturated hydrocarbons.

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Answer:

Bitter Taste

Explanation:

Acids have a sour taste and Bases have a Bitter taste. Acids turn litmus paper red because their pH level is less than 7. They are corrosive and can break down materials. They can also dissolve metals. Hope this helped ú⩊ù

yes because you have 2 H 2Na 2O on both sides

Answer : Yes, the given chemical reaction is balanced equation.

Explanation :

Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.

The given chemical reaction is,

[tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]

In this reaction, there are 2 atoms of sodium, 4 atoms of hydrogen and 2 atoms of oxygen are present on both side of the reaction. So,

This chemical reaction is a balanced reaction because in this reaction, the number of atoms of sodium, hydrogen and oxygen are balanced on the side of the reaction.

Hence, yes the given chemical reaction is balanced equation.

Answer:

$24000

Explanation:

We are given that

Sales tax=8%

Sales tax amount=$1920

We have to find the cost of the Buick before the tax.

Let x be the cost of Buick before the tax.

According to question

8% of x=1920

[tex]\frac{8}{100}\times x=1920[/tex]

[tex]x=\frac{1920}\times \frac{100}{8}[/tex]

[tex]x=24000[/tex]

Hence, the cost of the Buick before the tax=$24000

Answer : The sodium and chlorine are the products.

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on the reactant side must be equal to the product side.

The given balanced chemical reaction is,

[tex]2NaCl\rightarrow 2Na+Cl_2[/tex]

In the balanced chemical reaction, the species present on the left side of the reaction is known as reactant and the species present on the right side of the reaction is known as product.

From this we conclude that, the sodium, [tex]Na[/tex] and chlorine, [tex]Cl_2[/tex] are the products and sodium chloride, [tex]NaCl[/tex] is the reactant.

Hence, the sodium and chlorine are the products.

When an electron falls to a lower energy level, a photon is emitted representing the energy difference between the higher and the lower state. This process is a fundamental aspect in atomic physics and basis of many light effects.

When an electron falls to a lower energy level, energy is released. This energy transition is represented as an emitted photon, a packet of electromagnetic energy. Based on Bohr's model, a hydrogen atom is most stable in its ground state, when an electron is in its lowest energy orbit. An atom can absorb energy, causing an electron to shift to a higher energy level, or an excited state. However, an atom usually exists in the excited state for a brief period before the electron naturally transitions back to a lower energy level, or ground state. During this decline, a photon of specific wavelength is emitted, accounting for the energy difference between initial and final energy levels.

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Elements in the same family have similar properties because they have the same number of valence electrons, which determine how elements react.

The elements in the same family generally have similar properties because they have the same number of valence electrons, which determines how elements react. The valence electrons are the outermost electrons in an atom and are responsible for chemical bonding. Elements in the same family have similar electron configurations, leading to similar chemical behavior and properties.

For example, the halogens in group 17 (7A) all have seven valence electrons and tend to gain one electron to achieve a stable electron configuration, making them highly reactive nonmetals. In contrast, the alkali metals in group 1 (1A) have one valence electron and tend to lose it to achieve a stable electron configuration, making them highly reactive metals.

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