Why is it important for science to keep testing a hypothesis even after they’ve found it to be true?

90 ML is the final volume when 15. 00 ml of a 4. 50 m HCL solution is diluted to a final concentration of 0. 750 m.

M1V1=M2V2

15*4.5=0.75*V2

V2= 90 ML

Muriatic acid, often known as hydrochloric acid, is a powerful, colorless mineral acid with various industrial applications. When it combines with an organic base, it produces a hydrochloride salt. Gastric acid, a substance naturally created in the human stomach to aid in food digestion, is primarily made up of hydrochloric acid, an aqueous solution of hydrogen chloride gas. Consuming strong hydrochloric acid can also result in serious corrosive damage to the mouth, throat, esophagus, and stomach. These injuries may lead to bleeding, perforation, scarring, or the development of strictures. HF is a liquid because of hydrogen bonding, but HCl is a gas because of the absence of hydrogen bonding.

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Answer:

920mL of water

Explanation:

To solve this question we need to find as first the mass that must be added of water to make 1000mL of syrup using specific gravity. Thus, we can know the volume of water that mus be added:

1.31 is 1.31g/mL. In 1000mL = 1310g/1000mL. As the mass added of sucrose is 850g, the mass of water = Volume of water is:

1310g - 850g = 460g of water = 460mL to make 1L, To make 2L the amount of water that must be added is:

460mL * 2  =

The number of milliliters of water are used to prepare two liters of syrup is 920 mL of water.

Given that,

Based on the above information, the calculation is as follows:

1.31 is = 1.31g/mL.

Now

In 1000mL = \(1310g \div 1000mL\).

Now if the mass is added so the mass of water should be equivalent to the volume of the water.

= 1310g - 850g

= 460g of water

Now

= 460mL for 1L,

To make 2L the water should be  

= 460mL (2)

= 920mL of water

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Answer: D

Explanation: The Eukarya differ from the Archea and Bacteria in that their cells are eukaryotic, meaning they contain a membrane enclosed nucleus and other membrane enclosed organelles.

Eukarya is different from organisms classified as Archaea and Bacteria because Eukarya have membrane-bound nuclei. Therefore, option (D) is correct.

The type of cell of the organism can be classified into three domains. First is the bacteria which have no nucleus present in cells. Then Archaea have no nucleus in the cells but they have a different cell wall than bacteria. Then Eukarya have a nucleus in them.

The domains of Archaea and Bacteria are both composed entirely of small, single-celled organisms but they also have differences. All are composed of prokaryotic cells, which are nucleus-less cells.  T

All the cells in the Eukarya domain contain their genetic material or DNA within the nucleus. Four classes make up the Eukarya domain: Plantae, Fungi, Animalia, and Protista.

Therefore, the domain of the Eukarya is different from organisms classified as Archaea and Bacteria as Eukarya have membrane-bound nuclei.

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Answer:

Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion. Displacement is a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position.

Explanation:

The balanced equation for the reaction is N2(g) + O2(g) → 2NO(g).

The given value for the enthalpy change of the reaction is ΔH = 180.6 kJ. This value represents the heat released per mole of N2 reacted.

To determine the number of moles of NO produced, we need to calculate the moles of N2 reacted. Since the reaction is exothermic, the heat absorbed by the reaction is negative (-2976 kJ). However, it is not physically possible to have a negative number of moles. Therefore, we can conclude that no NO is produced in this case because the heat absorbed is insufficient to drive the reaction.

Using the equation ΔH = -2976 kJ/mol N2, we can set up a proportion:

180.6 kJ/1 mol N2 = -2976 kJ/x mol N2

Solving for x, we find:

x = (-2976 kJ * 1 mol N2) / (180.6 kJ) ≈ -16.46 mol N2

Since the reaction produces 2 moles of NO for every mole of N2, the number of moles of NO produced is twice the number of moles of N2:

Moles of NO = 2 * (-16.46 mol) ≈ -32.92 mol

The given reaction is N2(g) + O2(g) → 2NO(g), and the enthalpy change of the reaction is ΔH = 180.6 kJ. If the reaction absorbs 2976 kJ of heat, the number of moles of NO that can be produced can be calculated. By setting up a proportion, we find that approximately -16.46 moles of N2 are reacted. Since the reaction produces 2 moles of NO for every mole of N2, the calculated moles of NO would be approximately -32.92. However, negative moles are not physically possible, indicating that no NO can be produced in this case due to insufficient heat absorbed by the reaction.

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Enabling auto-tagging allows for automatic tagging of certain attributes or information within a system or program.

This can save time and effort by eliminating the need for manual tagging and ensuring accuracy in the tagging process. Enabling auto-tagging is a process that allows an analytics or advertising platform to automatically assign tags to specific elements in a campaign or website. This helps in tracking and organizing data more efficiently, making it easier to analyze and optimize your online presence. When auto-tagging is enabled, the system will automatically generate and add tags to your URLs or content without the need for manual input, saving time and effort.

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Answer:

B. Increase the mass of one of the objects.

E. Decrease the distance between the objects.

Explanation:

To effect an increase in the gravitational force between two objects, the mass of both objects should be increased and the distance between them reduced.

This is derived from the Newton's law of universal gravitation:

Therefore, if the mass of the two bodies are increased and the distance between them reduced, the gravitational force of attraction will increase.

Answer:

E. Decrease the distance between the objects

B. Increase the mass of one of the objects

Explanation:

Explanation:

Q = mcT ...you can either substitute the molar heat capacity of water in the place of c or the specific heat capacity of water.

if you try specific heat capacity ...the change in temperature needs to be converted to celsius temperature inorder to cancel it out from the rearranged formula of m = Q/cT where T stands for change in temperature which is found by deducting the initial or first temperature from the 2nd.

Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

Answer:

c is wrong

Explanation:

Answer:

mass increase!

Explanation:

<3

Answer:

b.distance between the objects

Explanation:

If you pull objects apart from each other they don't have as strong of a gravitational pull. think of it like a magnet the heavier the magnets the more power they can hold, the bigger they are the more surface area they have, and when you pull 2 magnets apart they slowly come weaker to each other.

Answer:

Sex

Explanation:

The carbon cycle diagram prompts a range of thoughts and questions about the complex and interconnected nature of carbon cycling on Earth.

See:

In the carbon cycle diagram, I see various components and processes related to the movement of carbon. There are different reservoirs or locations where carbon is found, such as the atmosphere, plants, animals, soils, and the ocean. Arrows indicate the flow of carbon between these reservoirs.

Think:

This diagram makes me think about the interconnectedness of carbon in the Earth's systems. It highlights how carbon moves between the atmosphere, biosphere, geosphere, and hydrosphere. It also reminds me of the importance of carbon in sustaining life and its role in climate regulation.

Based on this diagram, I think that the process of photosynthesis carried out by plants plays a vital role in removing carbon dioxide from the atmosphere and converting it into organic matter. Additionally, I believe that the decomposition of organic matter by decomposers, such as bacteria and fungi, releases carbon back into the environment.

Based on this diagram, I think that there may be a lot of carbon stored in the oceans, particularly in the form of dissolved carbon dioxide and as calcium carbonate in shells and coral reefs. The diagram also suggests that human activities, such as burning fossil fuels, deforestation, and land-use changes, can significantly impact the carbon cycle by releasing additional carbon dioxide into the atmosphere.

Wonder:

I wonder why the diagram does not explicitly show the role of human activities in altering the carbon cycle. Human activities have a substantial impact on carbon emissions and the balance of carbon in different reservoirs. I am curious to know how these activities are integrated into the overall carbon cycle and the long-term consequences they may have.

How does carbon move between the different reservoirs? Are there specific mechanisms or processes responsible for these movements? Understanding the specific pathways of carbon transfer would provide a more detailed understanding of the carbon cycle.

What are the time scales involved in the carbon cycle? How long does carbon stay in different reservoirs before being exchanged or transformed? Exploring the rates and durations of carbon movement would contribute to comprehending the dynamics and stability of the carbon cycle.

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There is only one alkene with the molecular formula C₇H₁₄ that will produce 2,4-dimethylpentane (C₇H₁₆) upon hydrogenation.

To determine the number of alkenes that can produce 2,4-dimethylpentane upon hydrogenation, we need to consider the structure of 2,4-dimethylpentane and the molecular formula of the alkene.

2,4-dimethylpentane (C₇H₁₆) has a straight carbon chain of five carbon atoms, with methyl groups (CH₃) attached to the second and fourth carbon atoms.

The molecular formula of an alkene with seven carbon atoms (C₇H₁₄) suggests that it contains a double bond.

Upon hydrogenation, the double bond in the alkene is replaced by a single bond, and each carbon atom gains two hydrogen atoms. To obtain 2,4-dimethylpentane (C₇H₁₆), we need a straight carbon chain of five carbon atoms with methyl groups attached to the second and fourth carbon atoms.

Considering these conditions, there is only one possible alkene with the molecular formula C₇H₁₄ that can produce 2,4-dimethylpentane (C₇H₁₆) upon hydrogenation. It is 3-methylpent-2-ene (C₇H₁₄).

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Answer:

Electrostatic attraction between oppositely charged ions

Explanation:

involve the formation of an octet of electrons in their valence shells, except for hydrogen which needs a duet of electrons

Answer:

Substances can change phase—often because of a temperature change. At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous.

The process of a solid becoming a liquid is called melting. (an older term that you may see sometimes is fusion). The opposite process, a liquid becoming a solid, is called solidification. For any pure substance, the temperature at which melting occurs—known as the melting point—is a characteristic of that substance. It requires energy for a solid to melt into a liquid. Every pure substance has a certain amount of energy it needs to change from a solid to a liquid. This amount is called the enthalpy of fusion (or heat of fusion) of the substance, represented as ΔHfus. Some ΔHfus values are listed in Table 10.2 “Enthalpies of Fusion for Various Substances”; it is assumed that these values are for the melting point of the substance. Note that the unit of ΔHfus is kilojoules per mole, so we need to know the quantity of material to know how much energy is involved. The ΔHfus is always tabulated as a positive number. However, it can be used for both the melting and the solidification processes as long as you keep in mind that melting is always endothermic (so ΔH will be positive), while solidification is always exothermic (so ΔH will be negative).

Answer: Vinegar

Explanation:

The vinegar and salt affects the shell because food coloring does not affect anything besides the color so the viniger has substances which dissolves thing and the salt just made the vinegar a stronger substance. The Vinegar reactes to form a compund on the shell.

Answer:

A.      

sorry if  it's wrong

Explanation:

Compared to size of its nucleus, the size of an atom is about

E. a thousand times greater

The size of an atom is much larger compared to the size of its nucleus. The nucleus of an atom contains protons and neutrons, which are tightly packed together in a small region. The electrons, on the other hand, occupy a larger space around the nucleus and contribute to the overall size of the atom. Therefore, the size of an atom is approximately a thousand times greater than the size of its nucleus.The electrons in an atom occupy electron orbitals that extend far beyond the size of the nucleus. The nucleus is extremely small and dense in comparison. This size difference is due to the distribution of electron cloud around the nucleus, making the atom much larger than its nucleus.

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Answer:

biosphere

Explanation:

The carbon cycle is the biogeochemical cycle by which carbon is exchanged between the biosphere, geosphere, hydrosphere and atmosphere of the Earth.

The biosphere refers to the regions of the surface and atmosphere of the earth or another planet occupied by living organisms.

Plants are responsible for taking in carbon in nature. When more trees are planted, carbon is absorbed by plants which is a component of the biosphere. Hence planting more trees means increasing the intake of carbon into the biosphere.

Answer:

Sound travels at different speeds depending on what it is traveling through. Of the three mediums (gas, liquid, and solid) sound waves travel the slowest through gases, faster through liquids, and fastest through solids.

Explanation:

hope this helps

Answer:

Ice is hard/solid, while water is liquid.

Explanation:

The structure of water molecules in ice is much closer together than that of water. Because the molecules are so close together, they are unable to move past each other and thus occupy a set shape and volume as ice.

The structure of water molecules in water, on the other hand, is further apart when compared to ice. Because they are further apart (and have more energy), the molecules are able to slip past each other and thus present as a liquid with a set volume, but not necessarily shape.

Note: Water can of course change phases. By taking energy away from the water we can turn it into ice (molecules slow down until they are stationary). By adding energy to the water we can turn it into steam/vapor (molecules are moving incredibly quickly with great energy and can freely move).

Explanation:

Elements heavier than Helium are synthesized in a number of environments. For elements that are lighter than Iron, those elements are synthesized during various phases in the evolution of massive stars. For elements heavier than Iron, one needs quite a bit of energy input to form these heavy elements.

Answer: The Mass of an electron is 9.1093837 x 10^-31 kgs

Explanation:

Answer:

1. The concentration of N₂O₄ decrease as the temperature of the system increased.

2. The formation of products was favored by the addition of heat.

3. The reaction going from right to left is exothermic.

4. N₂O₄ → 2NO₂; HR = +14 kcal.

Explanation:

Equation of the reaction is as follows: N₂O₄ ⇄ 2NO₂

The forward reaction proceeds with an increase in temperature. As the temperature of the reaction was increased, more of the N₂O₄ decomposed to form NO₂. Therefore, the concentration of N₂O₄ deceased.

2. The formation of products, that is the forward reaction leading to formation of NO₂ was favored by the addition of heat. Thus, with increase in temperature, the concentration of NO₂ increased.

3. An endothermic reaction is a type of reaction which requires energy input in the form of heat in order to proceed.

From the observations during the reaction, an increase in temperature by the addition of heat resulted in an increase in the forward reaction, therefore, the forward reaction is endothermic and the backward reaction is exothermic. Thus, the reaction in which colorless N₂O₄ is produced, is an exothermic reaction.

4. The change in enthalpy of a reaction is the difference in the heat content of reactants and products. For exothermic reactions, enthalpy change is negative, whereas for endothermic reactions, enthalpy change is positive.

The decomposition of  N₂O₄ to NO₂ is an endothermic reaction. Hence, the correct chemical equation is: N₂O₄ → 2NO₂; HR = +14 kcal.

Answer:

Well, you'd have 1 electron more than protons (since there are 10 protons and 11 electrons). So the previously neutral ion has now become an ion with a -1 charge

To calculate the standard-cell potential in volts for a given cell, we first need to know the cell potentials of the half-reactions involved. The resulting value gives us the standard-cell potential, which is a measure of the driving force behind the flow of electrons in the cell.

The calculation of standard-cell potential involves the use of cell potentials. Cell potential, also known as electromotive force (EMF), is the measure of the potential difference between two electrodes in a cell. It is the driving force behind the flow of electrons in a cell. The standard-cell potential refers to the cell potential when all reactants and products are in their standard states at standard conditions of temperature and pressure.To calculate the standard-cell potential in volts for the cell in the previous reaction, we need to know the cell potentials of the half-reactions involved in the cell. These values are typically given in a textbook or reference table. We then use the Nernst equation to calculate the standard-cell potential. The Nernst equation relates the cell potential to the standard-state potential and the concentrations of the reactants and products in the cell.

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