In the periodic table which elements typically have similar properties

Final answer:

The mass of a pure gold cube with a volume of 3.20 cm³ is 61.76 grams. Using the density of gold (19.3 g/cm³), the mass is calculated by multiplying density by volume, with the final answer rounded to three significant figures as 61.8 grams.

Explanation:

To calculate the mass of a pure gold cube with a given volume, you use the density of gold. The density (d) of gold is known to be 19.3 g/cm³. Thus, if the volume of the gold cube is 3.20 cm³, the mass (m) is calculated as follows:

m = d × V

Where m is the mass, d is the density, and V is the volume. Plugging in the values:

m = 19.3 g/cm³ × 3.20 cm³

m = 61.76 grams

Therefore, the mass of the gold cube is 61.76 grams. We limit our final answer to three significant figures, so the mass is 61.8 grams.

Answer:

The Answer is E

Explanation:

Got it right on the test.

The element has 31 protons based on the given information, but its specific identity cannot be determined.

The number of protons in an atom is determined by its atomic number. In this case, the element has 39 neutrons and a total atomic mass of 70. To find the number of protons, we subtract the number of neutrons from the atomic mass. So, the element has 31 protons.

The atomic number of an element determines its identity on the periodic table. However, with only the number of neutrons and the atomic mass given, it is impossible to determine the exact identity of the element. More information is needed to identify the element.

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The correct statement for a chemical change that gives off heat is that the molecule types change and the process is exothermic, as energy is released to the surroundings.

When an unknown substance undergoes a chemical change that gives off heat, the process is exothermic, and the types of molecules before and after the change are different. A chemical change that releases heat indicates that energy is a product of the reaction.

This is contrasted with an endothermic process where heat is absorbed, and the surroundings become colder. In exothermic reactions, bonds are formed which release more energy than the energy needed to break bonds in the reactants, hence the heat given off to the surroundings.

The correct statement for a chemical change that produces heat is: The types of molecules of the substance before and after the chemical change are different, and the change was exothermic.

Complete Question - An unknown substance undergoes a chemical change that gives off heat. Which statement is true?

Answer: Single displacement

Explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.

A general single displacement reaction can be represented as :

[tex]A+BC\rightarrow AC+B[/tex]

Thus if A is more reactive than b, then A can displace B from its position and can combine with C to give AC and B.

Given:A hockey player has the puck in the corner of the rink. An opposing player muscles him aside and emerges with the puck. Thus it is similar to single displacement reaction.

the answer is C 159.7g Fe2O3/1 mol Fe2 O3

When writing the conversion factor for the molar mass of Fe2O3, it will be written as:

The molar mass of a substance is the mass of one mole of that substance.

The molar mass of of iron oxide (Fe2O3) is 159.7 g/mol.

This means that 1 mole of iron oxide (Fe2O3) has a mass of 159.7 g.

Therefore, in writing the conversion factor, it will be written as:

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The natural sources of water pollution are algae blooms. Therefore, option C is correct.

Water contamination is the tainting of bodies of water, typically as a result of human activity, which has a detrimental impact on their uses. Aquifers, reservoirs, lakes, rivers, seas, and groundwater are all examples of bodies of water. When contaminants are introduced into these water bodies, water contamination results.

The main causes of water pollution are bacteria, viruses, parasites, insecticides, pharmaceuticals, plastics, feces, radioactive materials, fertilizers, and pesticides. These compounds are frequently invisible contaminants, since they do not always alter the color of the water.

The Industrial Revolution of the middle of the 19th century brought forth remarkable technological advancements, as well as new sources of air and water pollution. The repercussions of these developments started to be seen over the world by the middle of the 20th century.

Thus, option C is correct.

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Answer:

Algae Blooms

Explanation:

Answer:

Sodium chloride.

Explanation:

The organic compounds are compounds of carbon. They may have some other atoms like hydrogen, oxygen, sulfur, nitrogen, halogens etc. However the skeleton is of carbon only.

The simplest organic compound is methane (which is a hydrocarbon).

Sucrose is a disaccharide of glucose and fructose. It is an organic compound.

Urea is NH₂CONH₂, again an organic compound.

While Sodium chloride is NaCl, which has no carbon and it is an ionic inorganic compound.

Chemical sedimentary rock and detrital sedimentary rock differ in terms of their formation and composition.

Chemical sedimentary rock and detrital sedimentary rock are different in terms of how they form and their composition. Chemical sedimentary rocks are formed when dissolved minerals in water precipitate and solidify. Examples of chemical sedimentary rocks include limestone and rock salt. On the other hand, detrital sedimentary rocks are formed from the accumulation and lithification of fragments of other rocks. Examples of detrital sedimentary rocks include sandstone and shale.

The rate of change in elevation for Mount Zembat in Alaska is 0.05 feet per year, calculated by dividing the total change in elevation, 2 feet, over the 40-year period.

To calculate the rate of change in elevation for Mount Zembat in Alaska, we take the difference in elevation over the time period and divide it by the number of years. Forty years ago, the mountain was measured at 7600 feet, and today it is measured at 7598 feet. Therefore, the elevation has decreased by 2 feet over 40 years.

The rate of change per year is calculated as follows:

Rate of change = (Initial elevation - Current elevation) / Time

Rate of change = (7600 feet - 7598 feet) / 40 years

Rate of change = 2 feet / 40 years

Rate of change = 0.05 feet per year

So, the rate of change in elevation for Mount Zembat is 0.05 feet per year.

Answer: radiant energy to chemical energy

Explanation:-

Radiant energy is the energy of electromagnetic waves.

Chemical energy is the energy stored in the bonds of molecules.

Photosynthesis is a phenomenon in which green plants containing chlorophyll use sunlight as a source of energy to convert carbon dioxide and water to form glucose and oxygen.

Photosynthesis is the process used by plants, algae and certain bacteria to convert energy from sunlight called as radiant energy and turn it into chemical energy in the form of glucose which is used as a source of energy by many organisms.

[tex]6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2[/tex]

Answer : The volume of propane required are, 23.29 L

Solution : Given,

Mass of water = 75 g

Molar mass of water = 18 g/mole

First we have to calculate the moles of water.

[tex]\text{Moles of water}=\frac{\text{Mass of water}}{\text{Molar mass of water}}=\frac{75g}{18g/mole}=4.16moles[/tex]

Now we have to calculate the moles of propane.

The balanced chemical reaction will be,

[tex]C_3H_8+5O_2\rightarrow 4H_2O+3CO_2[/tex]

From the reaction, we conclude that

As, 4 moles of water produces from 1 mole of propane

So, 4.16 moles of water produces from [tex]\frac{4.16}{4}=1.04[/tex] mole of propane

Now we have to calculate the volume of propane.

As, 1 mole of propane contains 22.4 L volume of propane gas

So, 1.04 mole of propane contains [tex]22.4L\times 1.04=23.29L[/tex] volume of propane gas

Therefore, the volume of propane required are, 23.29 L

It's the electrons of an atom that determine its chemical properties. Electrons participate in chemical reactions—and it's these electron interactions that govern the atom's chemistry. For instance, chlorine's reactions stem from its desire to gain an extra electron.

Although the nucleus of an atom is indeed very important, it is the electrons of the atom that ultimately determine its chemical properties. This is because electrons involve in the chemical reactions.

In order for any chemical reaction to occur, there must be a movement, exchange or sharing of the electrons between two or more atoms. It's these electron interactions that govern the chemistry of the atom, hence determining its chemical properties.

For example, chlorine (Cl) has 7 electrons in its outermost shell and would prefer to gain an additional electron to achieve a complete outer shell. This electron 'hunger' is what fuels chlorine's reactions with other elements and compounds, thus determining its chemical properties.

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When solid zinc fluoride (ZnF2) dissolves in water, it dissociates into its constituent ions to form aqueous zinc ions (Zn^2+) and fluoride ions (F^-). This transformation represents a physical change known as dissociation. This reaction is typical for strong electrolytes like zinc fluoride due to the ionic bonds within the compound.

The compound zinc fluoride (ZnF2) is a strong electrolyte, which means that it completely dissociates into its constituent ions when dissolved in water. The process of dissociation occurs when the ions in the solid separate and disperse uniformly throughout the solution. This is facilitated by water molecules that surround and solvate the ions, reducing the strong electrostatic forces between them.

When solid zinc fluoride dissolves in water, it forms aqueous zinc ions (Zn^2+) and fluoride ions (F^-). This can be represented by the equation:

ZnF2 (s) -> Zn^2+ (aq) + 2F^- (aq)

This transformation is a physical change known as dissociation. The term 'aq' denotes that the ions are in an aqueous solution, indicating that they have been solvated by water molecules. It's noteworthy that the compound zinc fluoride, by nature of it being an ionic bond, is a strong electrolyte, hence it will nearly completely dissociate when dissolved in water.

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To find the edge length of a cube made of gold, divide the mass of the gold sample by its density and take the cube root of the result.

The edge length of a sample of gold, if it is in the form of a cube, can be determined using the concept of density. The density of gold is 19.3 g/cm³. To find the edge length, we need to divide the mass of the gold sample by its density. For example, if the mass of the gold sample is 10 grams, the volume is 10 g / 19.3 g/cm³ = 0.52 cm³. Since the sample is a cube, all three dimensions are equal, so the edge length would be the cube root of the volume. In this case, the edge length would be approximately 0.8 cm.

Covalent bonds involve the sharing of electrons between atoms, while ionic bonds involve the transfer of electrons from one atom to another.

The fundamental difference between covalent bonds and ionic bonds is that in covalent bonds, electrons are shared between atoms, whereas in ionic bonds, electrons are transferred from one atom to another.

In covalent bonds, the atoms are nonmetals and they share electrons to achieve a stable electron configuration. Examples include the bond between two hydrogen atoms in a hydrogen molecule (H2) and the bond between carbon and oxygen in carbon dioxide (CO2).

In ionic bonds, one atom loses electrons to become a positively charged ion (cation), while another atom gains those electrons to become a negatively charged ion (anion). These oppositely charged ions are then attracted to each other and form an ionic bond. An example is the bond between sodium (Na+) and chlorine (Cl-) in sodium chloride (NaCl).

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The amount of product formed in a reaction is determined by the limiting reactant.

The amount of product formed in a reaction is determined by the limiting reactant. The limiting reactant is the reactant that is completely consumed in a reaction, thus limiting the amount of product that can be formed. Let's say we have a reaction between hydrogen gas and oxygen gas to form water. If we have 4 moles of hydrogen and 2 moles of oxygen, the balanced chemical equation tells us that we need 2 moles of hydrogen for every 1 mole of oxygen. Since we have only 2 moles of oxygen, it will be completely consumed and we will only be able to form 4 moles of water, even though we have excess hydrogen.

Final answer:

Similar chemical properties in elements arise from their groupings in the periodic table. Bromine and Fluorine are paired as halogens; Magnesium and Strontium as alkaline earth metals; and Sulfur and Oxygen as chalcogens.

Explanation:

Elements that exhibit similar chemical properties are often found in the same group or family on the periodic table. The elements provided can be sorted into pairs based on their chemical behaviors and position in the periodic table:

In summary, similar properties in elements are a result of their position within the same group on the periodic table. For example, bromine and fluorine are both halogens, while magnesium and strontium are alkaline earth metals.