Answer:
1) 1.235 g.
2) 0.61 g.
Explanation:
From the balanced equation:Al(OH)₃ + 3HCl → AlCl₃ + 3H₂O.
1.0 mol of Al(OH)₃ reacts with 3.0 moles of HCl to produce 1.0 mol of AlCl₃ and 3.0 moles of H₂O.
1) How many grams of HCl can a tablet with 0.880 g of Al(OH)₃ consume?
To calculate the amount of HCl needed to consume 0.880 g of Al(OH)₃, we need to calculate the no. of moles of Al(OH)₃:no. of moles of Al(OH)₃ = mass/molar mass = (0.880 g)/(78.0 g/mol) = 1.13 x 10⁻² mol.
∵ Every 1.0 mol of Al(OH)₃ needs 3.0 moles of HCl to be consumed.
∴ 1.13 x 10⁻² mol of Al(OH)₃ needs (3 x 1.13 x 10⁻² = 3.385 x 10⁻² mol) of HCl.
The no. of grams of HCl = no. of moles of HCl x molar mass of HCl = (3.385 x 10⁻² mol)(36.5 g/mol) = 1.235 g.
2) How much H₂O?
∵ Every 1.0 mol of Al(OH)₃ produces 3.0 moles of H₂O.
∴ 1.13 x 10⁻² mol of Al(OH)₃ produces (3 x 1.13 x 10⁻² = 3.385 x 10⁻² mol) of H₂O.
The no. of grams of H₂O = no. of moles of H₂O x molar mass of H₂O = (3.385 x 10⁻² mol)(18.0 g/mol) = 0.6092 g ≅ 0.61 g.
Describe two parts of mitosis that are similar to meiosis
Phases of meiosis II.
Prophase II: Starting cells are the haploid cells made in meiosis I. Chromosomes condense.
Metaphase II: Chromosomes line up at the metaphase plate.
Anaphase II: Sister chromatids separate to opposite ends of the cell.
Which substances dissolve in water
Because water molecules are polar, water can dissolve many other polar substances. Water can also dissolve ionic compounds such as table salt.
Soluble substances anything power like that can be broken down by water like kool aid powder sugar salt. Please give me brainliest answer.
:) Hope this helped have a good day!
What is 0.045 rounded to the nearest hundredth?
0.05 would be your answer because when rounding there is one major rule which is look one place to the right for the rounding digit 5. Round up if that number is greater than or equal to 5 and round down if it is less than 5.
Therefor your answer would be 0.05.
* Hopefully this clarify everything and answers your question. Mark me the brainliest:)!!
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When scientists say that a theory can never be proven, what are they actually saying?
They are saying that every theory can eventually be changed a bit due to further research. It does not mean the theory is bad, just that it can become better.
When scientists say that a theory can never be proven, they are emphasizing the principle that scientific theories are always open to revision or challenge by new evidence. This reflects the provisional nature of scientific knowledge and the understanding that theories can be robust and reliable without being definitively proven. It underscores science as an ongoing, dynamic process of exploration and discovery.
When scientists say that a theory can never be proven, they are highlighting a fundamental principle of scientific inquiry. The nature of scientific theories is such that they can never be definitively proven because there is always the possibility for new evidence or observations to emerge that could challenge the existing understanding. Scientific theories are considered robust and reliable not because they are proven, but because they have withstood rigorous testing and have not been disproven. This principle is grounded in the philosophy of science, notably the ideas presented by British philosopher Karl Popper, who argued that scientific theories can never be proven, only disproven. Moreover, this concept underlines the inherent uncertainty and the provisional nature of scientific knowledge. It acknowledges that our current understanding is the best approximation of truth based on available evidence. However, with the advent of new technology, discoveries, or methodologies, theories might need to be revised or replaced. This open-endedness is what drives scientific progress and is a key reason why scientists prefer terms like support over prove. It ensures that science remains a dynamic and evolving field, always open to refinement and improvement in the light of new evidence. For instance, even highly successful theories, such as the theory of gravity or the theories of evolution, are seen as subject to revision. This doesn't diminish their credibility but rather highlights the strength of the scientific method: the capacity for theories to be tested, challenged, and refined over time. This perspective is crucial for advancing our understanding of the natural world, demonstrating that scientific inquiry is an ongoing process of exploration and discovery.
Which of the following statements is true? Running an electric current through a magnet can create a magnetic field. Electric engines change electricity into magnetism. The strength of a magnetic field increases with distance. Electrons are found in the nucleus of an atom.
Electric engines change electricity into magnetism
Answer:
A-Running an electric current through a magnet can create a magnetic field.
Explanation:
The answer is A-Running an electric current through a magnet can create a magnetic field. I chose B and got it wrong on my test. The correct one is A
Which phrase correctly describes temperature?
The phrase correctly describes temperature is average translation kinetic energy of the particles in an object. Therefore, option D is correct.
What describes temperature ?It is described as a measurement of the particle's typical kinetic energy inside an objective.
As a result, various kinetic energies can be experienced by particles. It may take the form of rotational kinetic energy, translational kinetic energy, or vibrational kinetic energy.
The average kinetic energy of all the atoms or molecules that make up a material is how we define its temperature. The kinetic energy of a substance's constituent particles varies.
A distribution can be used to depict the particles' kinetic energy at any particular moment.
Thus, option D is correct.
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Is it possible to change the strength of an acid? Explain how you would do this.
Answer:
Reducing or increasing the amount of H+ ions / hydronium (H3O+) ions
Explanation:
To reduce the pH (reducing the strength of the acid) can be done by adding a base (including a conjugate base such as bicarbonate ion) which will absorb the H+ ions either through adsorption or reaction.
Adding more H+ decreases the pH of the acid making it stronger. This can be done by adding HCL that will dissociate and increase the H+ ions.
Final answer:
The strength of an acid can be modified by altering its molecular structure or by changing the acid's concentration in a solution. Acid strength is directly related to the ability of the acid to donate hydrogen ions, which is influenced by the electronegativity of the atoms involved in the acid molecule.
Explanation:
It is indeed possible to change the strength of an acid. The strength of an acid depends on its ability to donate hydrogen ions (H+) in solution. Strong acids are characterized by 100% ionization in solution, while weak acids only partially ionize. The molecular structure of an acid, especially the electronegativity of its central atom, plays a significant role in acid strength. By modifying the molecular structure, such as by substituting atoms or groups with more electronegative ones, the acid strength can be changed.
For instance, adding more electronegative elements to the structure can increase the acid's ability to donate H+. Moreover, using the periodic table as a guide, we can predict the acid strength: as you move from left to right and down the periodic table, acid strength increases due to increasing electronegativity. One could also alter acid concentration or mix it with other substances (like bases) to change the pH, and thus, the perceived strength of the acid in a given solution.
Identify which property changes as temperature increases to increase the reaction rate.
A) Increasing the temperature decreases the molecular motion.
B) Increasing the temperature reduces the collision frequency.
C) Increasing the temperature divides the solubility of the solute.
D) Increasing the temperature increases the energy of the molecules.
Answer:D
Explanation:according to Kinetic molecular theory the kinetic energy is directly proportional to the absolute temperature.
It means that when we increase the temprature the motion of molecules increase,as a result the rate of reaction is also increased.
Which means that the effective collision is also increased.
Answer:
D) Increasing the temperature increases the energy of the molecules.
Explanation:
Increasing the temperature increases the energy of the molecules.
As temperature increases the energy of the molecules increases and the energy of the collision making it more likely for a reaction to occur.
The chemical reaction
2 H2O + energy → 2 H2 + O2
is
1. a synthesis reaction.
2. an endothermic reaction.
3. an exothermic reaction.
4. an ionic reaction.
In the given reaction, the energy has been utilized for the decomposition of the water molecule, hence the reaction has been termed as an endothermic reaction.
The chemical reaction can be distinguished based on the energy released or uptake by the reaction. Or can be differentiated on the basis of the reaction to be constructive or destructive.
The reaction that results in the formation of the new compound has been termed the synthesis reaction.
The reaction that requires energy for the reaction to complete is an endothermic reaction.
The reactions that release energy are termed exothermic reactions.
The ionic reaction results when the ions interact to form the ionic bond.
In the given reaction, the energy has been utilized for the decomposition of the water molecule, hence the reaction has been termed as an endothermic reaction.
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Please do this entire worksheet for me. I will award 59 points!!
where is the work sheet?
Plz post the worksheet so that I can do it for you. Please don't report this, i am trying to help!
explain how the water in an iceberg may fall as rain over a city
They go through something called the Water Cycle,
First, they will go through the Evaporation Step where the water will evaporate into a gas and raise into the clouds.
Then, they will go through the Condensation Step where the Vapor that went into the clouds will cool down and turn back into liquid water.
Next, they will go through the Precipitation Step where the Water (which can be Rain Hail snow or Sleet) will fall out of the clouds.
Finally, all of the fallen water will collect into Lakes, Oceans, Rivers, Streams and sometimes water under the ground.
if the water is still turning into vapor from condensation it will turn to rain eventually but it cant be evaporated if heat cant get the water think as a air bubble the air remains until it pops or if its frozen in ice it will remain till the water melts and exposes the air to the world again.
The substances below are listed by increasing specific heat capacity value. Starting at 30.0 °C, they each absorb 100 kJ of thermal energy. Which one do you expect to increase in temperature the most? Silver, 0.239 J/(g °C) Aluminum, 0.921 J/(g °C) Lithium, 3.56 J/(g °C) Water, 4.184 J/(g °C)
Answer:
Silver, 0.239 J/(g °C)
Explanation:
The heat change is related to specific heat as given by the formula;Heat change = mass of substance × specific heat × change in temperature
Therefore; considering same amount of substance or equal masses and have the same initial temperature.The change in temperature will be inversely proportional to the specific heat. Therefore; the higher the specific heat lower the temperature change.Hence, the change in temperature will be highest for the substance with the lowest specific heat.Therefore; the one that will increase in temperature the most is Silver
Answer:
Silver, 0.239 J/(g °C)
Explanation:
Sort the properties of metalloids into the correct categories
(See image)
Lustrous
Solid at room temerature
In-Between Characteristics:Semiconducting
Amphoteric
Nonmetallic:Brittle
predict the products of the decomposition of lithium nitride, Li3N
A) Li3 + N
B) Li3 + N2
C) Li + N
D) Li + N2
D) Li + N2
Explanation;A decomposition reaction is a type of chemical reaction in which one reactant yields two or more products. Lithium nitride undergoes thermal decomposition to produce Lithium and nitrogen gas. This reaction takes place at a temperature of 300° to 500°C in a vacuum.The equation for the reaction is;2Li3N(s) → 6Li(s) + N2(g)
What is the pressure exerted by 1.0 mol of a gas with temperature of 20 C and a volume of 7.5 L?
We have to assume the gas behaves similar to an ideal gas and we can use the ideal gas law equation
PV = nRT
Where
P - pressure
V - volume - 7.5 L
n - number of moles - 1.0 mol
R - universal gas constant - 0.0821 L.atm/mol.K
T - temperature in kelvin
20 degrees celcius + 273 = 293 K
Substituting the values in the equation
P x 7.5 L = 1.0 mol x 0.0821 L.atm/mol.K x 293 K
P = 3.2 atm
The pressure exerted is 3.2 atm
Which of the following processes are endothermic? ice forming on a pond iodine crystals subliming water boiling gasoline burning
MULTIPLE ANSWERS
The boiling of water and sublimation of iodine crystals are endothermic processes.
Answer: Option B & C
Explanation:
Endothermic process are the classifications of chemical reactions where the heat is absorbed by the system from the surroundings. As the matters can exists in three phases like solid, liquid and gases.
The endothermic process occurs by absorption of heat energy by the system. So according to the given options, the boiling of water and iodine crystal sublimation follows endothermic process. In the boiling of water occurs when the water molecules absorb heat from the surrounding and convert to gas phase.
Similarly, the sublimation of iodine crystals also require heat energy from the surrounding to break the bonds of the iodine crystals to sublimate to gas phase. Thus the boiling of water and sublimation of iodine crystals are the examples of endothermic processes.
Which process is shown in the diagram below ?
Metamorphosis
Regulation
Fertilization
Respiration
The process that is being shown in the diagram below is Fertilization
The process that is being shown in the diagram below is Fertilization
If an atom has 17 protons, 15 neutrons, and 20 electrons, what is the atom's electrical charge?
The overall charge on this ion is -3. Neutrons don’t carry a charge, while protons and electrons carry a net +1 and -1 charge, respectively. In this case, the electrons outweigh the protons by 3, making the overall charge -3.
Hope this helps!
The specific heat of aluminum is 0.897j/(g•°C). If a 22.6 g sample of aluminum is heated from 25°C to 250°C, then how much heat will the aluminum absorb?
Q=mcat
=(22.6)(.897)(250-25)
4,561.245 or 4.5 * 10^-3
To find the heat absorbed by the aluminum, use the formula Q = mc riangle T. The aluminum will absorb 4554.525 joules of heat when its temperature is increased from 25°C to 250°C.
The question involves calculating the amount of heat absorbed by a sample of aluminum when it is heated from one temperature to another, using the specific heat capacity of aluminum. The formula for heat absorbed or released is Q = mc riangle T, where Q is the heat absorbed, m is the mass of the substance, c is the specific heat capacity, and riangle T is the change in temperature.
To solve for Q in the given case:
Mass (m) of the aluminum sample = 22.6 g
Specific heat capacity (c) of aluminum = 0.897 J/g°C
Temperature increase ( riangle T) = 250°C - 25°C = 225°C
Now plug in the values: Q = 22.6 g * 0.897 J/g°C * 225°C = 4554.525 J
The aluminum will absorb 4554.525 joules of heat.
What do scientists do? O A. They use their knowledge to make public policy O B. They make sure all facts fit scientific theories. O C. They make ethical decisions for the government O D. They learn about the world through observation.
Considering there are different fields of science and many career involving the matter, I'd say that option D. They learn about the world through observation. makes the most sense in this scenario.
I hope this helps! :)
I think the answer to this is D, I am sorry if I’m wrong
How do decomposers get energy?
A. by making their own food
B. by eating other organisms
C. by converting light energy into chemical energy
D. by breaking down the waste materials of dead organisms
I think the aswer is D
What trend is seen in atom size, going down the periodic table?
A. Atomic radius gets bigger the lower an atom appeares on the periodic table
B. Atomic radius stays the same in a column of the period table
C. Atomic radius varies the lower an atom appears on periodic table.
D. Atomic radius gets smaller the lower an atom appears on the periodic table.
A, it gets bigger, you can tell by its atomic mass and electron configuration
Answer:
A
Explanation:
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Temperature...
A.
is an indicator of the amount of thermal energy that an object possesses.
B.
only pertains to heat transfer, not thermal energy.
C.
is exactly the same as thermal energy.
D.
is not related to thermal energy.
1. An ice cube that is dropped into a glass of water melts because
A.
the ice is denser than the water.
B.
the water is denser than the ice.
C.
the water is liquid, and the ice is solid.
D.
heat energy moves from the water to the ice.
2.What type of energy transformation occurs when a light bulb is turned on?
A.
Mechanical energy is converted into kinetic energy.
B.
Electrical energy is transformed into heat and mechanical energy.
C.
Electrical energy is transformed into heat and light energy.
D.
Potential energy is converted into kinetic energy.
Temperature... - A
1. An ice cube that is dropped into a glass of water melts because - D
2 What type of energy transformation occurs when a light bulb is turned on -
C
➷ Temperature is an indicator of the amount of thermal energy that an object possesses [option A]
An ice cube that is dropped into a glass of water melts because heat energy moves from the water to the ice [option D]
Electrical energy is transformed into heat and light energy [option C]
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The Ethical, Legislative, Social Initiative is the agency responsible for _____.
convicting and closing poorly run forensic laboratories
the first DNA-analysis-based convictions
upholding the guidelines for managing a DNA laboratory
consideration of ethical, legal, and social implications related to the human genome
They are responsible for DNA
Answer:
considering ethical, legal, and social implications related to the human genome
Explanation:
A 3.87mg sample of an organic compound gave 5.80mg CO² and 1.58mg h²O on combustion. Deduce the empirical formula of the compound.
Answer:
C₃H₄.
Explanation:
The organic compound gives CO₂ and H₂O.The no. of moles of CO₂ produced = mass/molar mass = 5.80 mg/44.0 g/mol = 0.1318 mmol.
Which is corresponding to 0.1318 mmol of C.
The no. of moles of H₂O produced = mass/molar mass = 1.58 mg/18.0 g/mol = 0.08778 mmol.
which corresponds to (0.08778 x 2) = 0.1756 mmoles of H.
The ratio of the number of moles of hydrogen to carbon in the composition of the compound will be 0.1756/0.1318 = 1.332 = 1 + 1/3 = 4/3.
Therefore, the empirical formula of the compound under consideration is C₃H₄. chemical equilibrium between gaseous reactants and products is shown.
N2(g) + 3H2(g) ⇌ 2NH3(g)
How will the reaction be affected if the pressure on the system is decreased?
Answer:
The reaction is shifted to the left.
Explanation:
Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.When there is a decrease in pressure, the equilibrium will shift towards the side with more no. of moles of gas molecules of the reaction.The reactants side (left) has 4.0 moles of gases and the products side (right) has 2.0 moles of gases.So, decreasing the pressure will shift the reaction to the side with more moles of gas (left side).so, the reaction is shifted to the left.
Decreasing the pressure on a system at chemical equilibrium will cause the reaction to shift towards the side with fewer moles of gas.
Explanation:When the pressure on a system at chemical equilibrium is decreased, the system responds by shifting in the direction that reduces the number of moles of gas. In this case, decreasing the pressure will cause the reaction to shift towards the side with fewer moles of gas, which is the reactant side. The reaction will produce more N2 and H2 and less NH3.
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Which function do aspen trees serve in mountain area?
A. producers
B. scavengers
C. primary consumers
D. secondary consumers
A is your answer
They're producers, they provide nutrients for primary consumers which get eaten by secondary consumers then scavengers come in and clean up the mess :)
Aspen trees in a mountain area serve as the role of producers. They convert sunlight, water, and carbon dioxide into glucose for their survival and for providing nourishment for the primary consumers.
Explanation:In a mountain area, aspen trees serve as producers. Producers are organisms in an ecosystem that produce their own food through photosynthesis, like plants and particular forms of bacteria. Aspen trees, being plants, convert sunlight, water, and carbon dioxide into glucose which serves as their food. This process of photosynthesis not only allows aspen trees to grow and survive, but also contributes to the overall ecosystem by storing energy and providing nourishment for primary consumers. Hence, they are at the base of the food chain in respective ecosystems.
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Condensation is the change from _____.
condensation is the change from a gas to a liquid.
for example, when a humid room is cooling, the water vapour particles lose kinetic energy, move closer together and become liquid water.
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what is a subshell? explain why is it important.
a subshell is a subdivision of electron shells seperated by electron orbitals
How many moles of solute do you need to make one liter of a 1.25 mol/L ammonium hydroxide solution
Answer:
1.25mol of solute
Explanation:
Given parameters:
Volume of solvent = 1liter
Molarity of solution = 1.25mol/L
Solution:
To solve this problem, we use the concept of mole.
Number of moles of solute= molarity x volume of solvent
Number of moles = 1.25 x 1 = 1.25mol