The main difference between the Bohr model of the atom and the wave-mechanical model of the atom lies in the level of certainty of where the electrons are located.

Answer is: b) blue.

Neutral litmus paper turns red in acidic solutions and turns blue in alkaline solutions. At neutral pH, litmus paper does not change color.

Acids and bases have opposite properties and have the ability to neutralize each other. Acids taste sour, give sharp stinging pain in a wound and react with metals to produce hydrogen gas.

Bases turn red litmus paper blue and acids turn blue litmus paper red.

Final answer:

The key difference is that a heterogeneous mixture is non-uniform with visible components, whereas a homogeneous mixture is uniform and components are not visibly distinct.

Explanation:

Differences Between Heterogeneous and Homogeneous Mixtures

A heterogeneous mixture consists of two or more substances and is non-uniform, meaning the individual components can often be seen and are not consistent throughout the mixture. Examples include sand and water, Italian dressing, and chocolate chip cookies. Homogeneous mixtures, on the other hand, are uniform throughout; the components are well mixed and indistinguishable. Examples include salt dissolved in water and air. These mixtures can also be solutions or colloids when the mixture has a consistent composition and appears uniform at the microscopic level.

In summary, the main difference lies in the uniformity of the mixture. Homogeneous mixtures are uniform in composition and phase, whereas heterogeneous mixtures have a variable composition and can often be separated into their individual components through physical methods such as filtration.

The Biosphere is the sphere that extends from inside Earth's crust to the lower atmosphere. It is a global ecosystem composed of living organisms and their nonliving surroundings. This includes all places where life exists, from deep in the ground, through land and water surfaces, to the lower atmosphere.

The sphere that extends from inside Earth's crust to the lower atmosphere is known as the Biosphere. The Biosphere encapsulates all parts where life exists, starting from deep in the Earth's crust, through surface land and bodies of water, up to the lower atmosphere. It is a global ecosystem composed of living organisms (biota) and the abiotic (nonliving) factors from which they derive energy and nutrients.

Examples of places within the Biosphere include subterranean regions, forests, oceans, lakes, rivers, and the air around us. All living organisms, from the smallest bacteria to the largest trees and animals, are a part of the Biosphere.

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Answer: b.Its results can improve lives, but sometimes consequences are negative.

Explanation:

Biotechnology is a field of science which deals with use of technology and biological sciences to solve problems related to diseases, disorders, and improving the quality of organisms.

In this a practice of genetic engineering is petfomed in which the genome of organisms are manipulated so as to introduce a new gene or to delete a gene which is causing disease.

Sometimes the results of these scientific processes are good thus helps in increasing the yield of the organism (plant or animal), introduces new traits, helps in erradication of diseases or disorders and others. But sometimes the results are harmful for the organism like instead of recovering from disease the organism becomes susceptible to many diseases. Also with the introduction of new traits some beneficial traits are suppressed.

Answer:

Volume

Explanation:

Intensive properties do not depend on the mass of the matter whereas extensive properties do depend on the mass of the matter. Mass and volume are examples of extensive. Hence option D is correct.  

Options A, B and C are incorrect as magnetism, boiling point and thermal conductivity are all intensive properties.  

Option D is correct for your question.

An intensive physical property does not depend on the amount of matter. Following this rule, it's easy to see Volume is not an intensive physical property.

Your best answer would be D

The correct order of the steps in the scientific method begins with asking a question, followed by research, formulating a hypothesis, conducting an experiment, collecting data, analyzing the results, forming conclusions, and reporting the findings.

The scientific method is a structured approach to inquiry that is used across various scientific disciplines. To answer the question on the correct order of the steps involved in the scientific method, the sequence that properly represents this process is as follows:

These steps ensure that scientific research is conducted systematically, and findings can be replicated and validated by other scientists. It's important to remember that this process can be iterative. If the results lead to new questions or the hypothesis is not supported, the cycle begins anew with refinements to the hypothesis or new experiments.

The equation for the photosynthesis reaction in which carbon dioxide and water react to form glucose is . The hear reaction is the difference between the bond dissociation energies in the products and the bond dissociation energies of the reactants

The reactant molecules have 12 C = O, 12 H - O bonds while the product molecules have 5 C - C, 7 C – O, 5 H – O, and 6 O = O bonds. The average bond dissociation energies for the bonds involved in the reaction are 191 for C = O, 112 for H – O, 83 C –C, 99 C – H, 86 C – O, 119 O = O.

Substitute the average bond dissociation energies in the equation for and calculate as follows

= [12 (C=O) + 12 (H-O)] – [5(C-C) + 7(C-H) + 7 (C-O) + 5(H-O) + 6(O=O)]

= [12x191 kcal/mol + 12x112 kcal//mol] – [5x83 kcal/mol + 7x99 kcal/mol + 7x86 kcal/mol + 5x112 kcal/mol + 6x119 kcal/mol]

= 3636 kcal/mol – 2984 kcal/mol = 652 kcal/mol x 4.184 Kj/1kcal = 2.73x10^3 kJ/mol

So, enthalpy change for the reaction is 652 kcal/mol or 2.73x10^3 kJ/mol

To estimate ΔH for the reaction, calculate the sum of bond dissociation energies for all the bonds broken and formed. Use the bond dissociation energies from Table 7.1 and convert ΔH from kJ to kcal.

To estimate ΔH for the reaction, we need to calculate the sum of the bond dissociation energies for all the bonds broken and formed. C6H12O6 has five C−C bonds, seven C−H bonds, seven C−O bonds, and five O−H bonds. Using the bond dissociation energies from Table 7.1, we can calculate the total energy of the bonds broken and formed and determine the enthalpy change. Each bond's energy is multiplied by the number of moles of that bond in the reaction.

The bond dissociation energy values are given in kJ/mol, so we need to convert to kcal. 1 kcal is equal to 4.184 kJ. Therefore, we can divide the calculated enthalpy change value by 4.184 to get the value in kcal.

Here is the step-by-step calculation:

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Heat can never flow from cold to hot So, the correct option is (B).

Heat is defined as the transfer of kinetic energy from one medium or object to another medium or from an energy source to a medium or object. These energy transfer can occur in three ways: radiation, conduction, and convection.

When two bodies at different temperatures are brought together, energy is transferred, meaning that heat flows from the hot body to the cold body, so the effect of this transfer of energy is usually, but not always, the temperature of the cold body increases. and decrease in hot body temperature. So, there is no flow of heat from cold to hot.

Thus, heat can never flow from cold to hot So, the correct option is (B).

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 decomposition and melting

Answer:

Decomposition and melting

Explanation:

Decomposition is the process of splitting two or more compounds apart from each other. Usually, the decomposed substance have different chemicals identities hence the reason why it is a chemical process since it causes chemical change. Example is the decomposition of hydrated salts of metals. CuSO4.5H20 is a penta-hydrate salt I.e contains 5 molecules of water. If this compound is heated, two different compounds are formed and changes the chemical identity of the compound. Melting is a process of liquidizing compounds or elements to the point it changes physical state from solid-liquid. Melting does not change the chemical identity of the compound but rather the physical state of the compound.

Answer: the sum of the neutrons and protons

Explanation:

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.  Protons and neutrons are located in the nucleus and contributes to the mass of an atom.

Mass number = Number of protons + Number of neutrons

Atomic number is defined as the number of protons or number of electrons that are present in an atom.

Atomic number = Number of electrons = Number of protons

Hence, sum of neutrons and protons define the mass number.

Answer:

58g for short on the question xD i dont wanna read all he has too looooooooooooooooooooooooooooooooooooooooooooooooooooong

Explanation: