Chemistry is the science of materials, their composition and structure and the changes they undergo, we study chemistry because

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 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?

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, red color of visible light has the longest wavelength. The correct option is option B.

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave, light wave.

There is a relation between frequency of wave, and wavelength of wave

Mathematically,

ν =c÷λ

where,

ν =frequency of light

c is speed of light

λ is the wavelength of light

Red color of visible light has the longest wavelength.

Therefore, red color of visible light has the longest wavelength. The correct option is option B.

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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.

The atomic nucleus does not contain electrons, which are the negatively charged subatomic particles that orbit the nucleus. Protons and neutrons, carrying positive and no charge respectively, are the ones that make up the nucleus.

The atomic nucleus does not contain electrons, which are negatively charged subatomic particles. The nucleus is a positively charged region consisting of protons, which have a positive electric charge, and neutrons, which are neutral. Electrons are instead located outside the nucleus, moving through the mostly empty space that makes up the rest of the atom. These subatomic particles—protons, neutrons, and electrons—are bound by forces that define the structure of the atom. The arrangement of these particles explains why the nucleus itself carries a net positive charge, balanced by the negative charge of the electrons that orbit around it.

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 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:

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.

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.

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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Answer:

The Answer is E

Explanation:

Got it right on the test.

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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Answer is C – Unsaturated fat.

Fats are large molecules basically made from a combination of glycerol and three chains of fatty acids. Usually fats consist of C, H and O. According to the C – C bond, there are two types of fats as saturated fats and unsaturated fats. Saturated fats have only C – C single bonds and all C atoms are sp³ hybridized atoms. But in unsaturated fats other than C – C single bonds there are C – C double bonds. Hence, both sp³ and sp² hybridized C atoms can be seen.

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:

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.

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 correct name for the molecular compound with chemical formula N₂S₄ is dinitrogen tetrasulfide.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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