Answers
Answer:
40.32 grams of solute required for the preparation of 1.5L of 0.32M NaHCO₃
Explanation:
Molar concentration or molarity is a measure of the concentration of a solute in a solution. Molarity is defined as the number of moles of solute present in one liter of solution.
Molarity is calculated by the expression:
\(Molarity=\frac{number of moles of solute}{volume}\)
Molarity is expressed in units \(\frac{moles}{liter}\).
In this case:
Molarity: 0.32 Mnumber of moles of solute: ?volume: 1.5 LReplacing:
\(0.32 M=\frac{number of moles of solute}{1.5 L}\)
Solving:
number of moles of solute= 0.32 M* 1.5 L
number of moles of solute= 0.48 moles
Being the molar weight of NaHCO₃ equal to 84 g / mole, the following rule of three can be applied: if there are 84 grams in 1 mole, how much mass is there in 0.48 moles?
\(mass=\frac{0.48 moles*84 grams}{1 mole}\)
mass= 40.32 grams
40.32 grams of solute required for the preparation of 1.5L of 0.32M NaHCO₃
Related Questions
If an object is accelerating at a rate of 25 m/s2, how long (in seconds) will it take to reach a speed of 550 m/s? (Assume an initial velocity of zero.)
Answers
Answer:
22s
Explanation:
Given parameters:
Acceleration = 25m/s²
Final velocity = 550m/s
Initial velocity = 0m/s
Unknown:
Time taken = ?
Solution:
To solve this problem, we are going to use one of the motion equations:
v = u + at
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time taken
550 = 0 + 25 x t
550 = 25t
t = 22s
What is N for silicon tetrachloride, SiCl4?
Answers
Which of the following has more than one kind of monomer in its repeating unit? homodimer copolymer codimer homopolymer
Answers
Copolymer have more than one kind of monomer in its repeating unit.
What are Copolymers ?Those polymers that have more than one kind of monomer in its repeating unit are called Copolymers.
These are useful to modify the properties of polymers that needs more strength , durability etc.
It is a way of improving mechanical properties of a polymer .
A copolymer formed from two dissimilar molecules (as two olefins) is a codimer and the homopolymer and homodimer as the name suggest are made of one similar kind of monomers.
Copolymer have more than one kind of monomer in its repeating unit.
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what is the functional group
Answers
As you can see from -COOH
A researcher observes a reaction and gathers the data in the table below. Observations Mass decreased after reaction Energy is released during reaction New substance is formed Which piece of evidence best identifies they type of reaction as nuclear or chemical? 1. Chemical, because energy is released during the reaction. 2.Nuclear, because energy is released during the reaction. 3.Nuclear, because the mass decreased after the reaction. 4.Chemical, because a new substance is formed.
Answers
The piece of evidence that best identifies the type of reaction as nuclear or chemical is: Chemical, because a new substance is formed. Option 4
In this scenario, the observation that a new substance is formed is a key characteristic of a chemical reaction. Chemical reactions involve the rearrangement of atoms to form different substances with distinct properties. The formation of a new substance indicates a chemical change has occurred.
The other pieces of evidence listed do not necessarily point to a nuclear reaction:
Chemical, because energy is released during the reaction: Energy can be released in both nuclear and chemical reactions, so this observation alone is not sufficient to determine the type of reaction.
Nuclear, because energy is released during the reaction: While energy can be released in nuclear reactions, it is not exclusive to them. Chemical reactions can also release energy, such as in exothermic reactions.
Nuclear, because the mass decreased after the reaction: This observation suggests a change in mass, which could be indicative of a nuclear reaction. However, it is important to consider that chemical reactions can also involve changes in mass, such as the formation of gases or dissolution of a solid.
Overall, the most conclusive evidence to identify the type of reaction is the formation of a new substance, which aligns with a chemical reaction.
Option 4
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Q2 A solution has a (OH-) = 4.0x10^-5 M. What are the [H30+) and the pH of the
solution?
Answers
Answer:
[H₃O⁺] = 2.5 × 10⁻¹⁰ M
pH = 9.6
Explanation:
Step 1: Given data
Concentration of OH⁻ in the solution ([OH⁻]): 4.0 × 10⁻⁵ M
Step 2: Calculate the concentration of H₃O⁺ in the solution
Let's consider the self-ionization of water.
2 H₂O(l) ⇄ H₃O⁺(aq) + OH⁻(aq)
The ion-product of water (Kw) is:
Kw = 1.0 × 10⁻¹⁴ = [H₃O⁺] × [OH⁻]
[H₃O⁺] = 1.0 × 10⁻¹⁴/[OH⁻]
[H₃O⁺] = 1.0 × 10⁻¹⁴/4.0 × 10⁻⁵
[H₃O⁺] = 2.5 × 10⁻¹⁰ M
Step 3: Calculate the pH of the solution
We will use the following expression.
pH = -log [H₃O⁺]
pH = -log 2.5 × 10⁻¹⁰
pH = 9.6
Taking into account the definition of pH and pOH, the pH and [H₃O⁺] of the solution is 9.602 and 2.5×10⁻¹⁰ M respectively.
First of all, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
The following relationship can be established between pH and pOH:
pH + pOH= 14
In this case, you know that [OH⁻]= 4×10⁻⁵ M. For this concentration, the pOH is calculated as:
pOH= - log (4×10⁻⁵ M)
pOH= 4.398
Then, pH can be calculated as:
pH + 4.398= 14
pH= 14 - 4.398
pH= 9.602
So, the [H₃O⁺] is calculated as:
9.602= - log [H₃O⁺]
[H₃O⁺]= 10⁻⁹ ⁶⁰²
[H₃O⁺]= 2.5×10⁻¹⁰ M
Finally, the pH and [H₃O⁺] of the solution is 9.602 and 2.5×10⁻¹⁰ M respectively.
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brainly.com/question/13557815?referrer=searchResultsQuestion 5 of 20:
Select the best answer for the question.
5. When considering gravity acceleration and the force of acceleration, what must be true?
O A. The direction of acceleration must be perpendicular to the direction of the force.
O B. The direction of the force and the direction of acceleration must be opposite of each other.
OC. The direction of the force and the direction of acceleration must be the same as each other.
O D. The mass of the body must be the same as the acceleration of the body.
Mark for review (Will be highlighted on the review page)
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Answers
As part of an investigation of the population of foxes on Sunday Gill island a scientist graphed the number of foxes presented on the island over a Spam of 15 years as shown below the study began with the earlier 0 and run until the start of year 15 According to the graph during the witch year the event reduced the carrying capacity of the area
Answers
The carrying capacity of the area was reduced in the year 10 according to the graph that shows the number of foxes on the island over a span of 15 years.
The graph shows a population of foxes over a span of 15 years. The y-axis represents the number of foxes on the island, while the x-axis represents time. The study began with the earlier 0 and ran until the start of year 15. According to the graph, the carrying capacity of the area was reduced in the year 10.
In the graph, it is shown that the population of foxes on Sunday Gill island had a significant increase from year 0 to year 3. After year 3, the fox population started to decrease and then remained fairly constant until year 10. After year 10, the population of foxes on the island started to decline more rapidly until the end of the study in year 15
This decline in the population of foxes on the island is most likely due to the reduction in carrying capacity of the area. Carrying capacity refers to the maximum number of individuals that an environment can sustain. When the carrying capacity of an environment is reached, it means that the environment can no longer provide the necessary resources to sustain the population.
There are various factors that can cause a reduction in carrying capacity, such as environmental degradation, competition for resources, or a natural disaster. In this case, it is not clear what caused the reduction in carrying capacity in year 10, but it is likely that it was due to some environmental factor that impacted the availability of resources for the fox population.
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Which of the following processes is exothermic? A.cooking an egg B. the chemical reaction in a "cold pack" often used to treat injuries a camp fire C. melting of ice D. None of the above is exothermic
Answers
Answer: none of the above
Explanation: all are endothermic
Covalent bonds are formed between the
two nonmetals
and
The nonmetals will
electrons.
Answers
Answer:
Explanation:
A covalent bond is formed between two non-metals that have similar electronegativities. Neither atom is "strong" enough to attract electrons from the other
For each of these equations, predict the effects of temperature on the spontaneity of the reaction.
2N2O(g) → 2N2(g) + O2(9)
AH<0; AS > 0
A
H
A
S
AG
Spontaneity
+
+
H20(1) ► H2O(9)
AH> 0; AS >
-
+
302(9) ► 203(9)
AH >0; AS < 0
+
+ or -
nonspontaneous for
all T
spontaneous for all T
spontaneous at high
т
nonspontaneous at
low T
spontaneous at low T
nonspontaneous at
high T
C(s) + 2Cl2(g) → CCl4(9)
AH<0; AS < 0
+ or -
DONE
Answers
The spontaneity of a reaction depends on the temperature, enthalpy and entropy.
What is spontaneity of a reaction?A reaction is said to be spontaneous if it can proceed on its own without a further input of energy.
In the first case, when the enthalpy is less than zero and the entropy is greater than zero, the reaction is spontaneous at all temperatures.
In the second case, when the enthalpy greater than zero and the entropy is greater than zero, the reaction needs to proceed at high temperatures to be spontaneous.
In the third case, when the enthalpy is greater than zero and the entropy is less than zero, the reaction ought to proceed at low temperature in order to be spontaneous.
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Answer:
1.Spontaneous at all temperatures
2. Spontaneous only at high temperatures
3. Non spontaneous at all temperatures
4. Spontaneous only at low temperatures
Explanation:
Just did it on edge
2. Use the picture below to answer the question. ** С D B Bob is riding a roller coaster. At vihat point does the car have the most potential energy? А A 3
Answers
Answer:
the answer is A
Explanation:
Answer:
a
Explanation:
the roller coaster is at the highes pont witch is a .
b. What is the sum of the following numbers: 9.56; 0.015; 10.23; 1.004
Answers
Answer:
It is 20.809
You can Just add zeros until every number got the same digits.
Which strand of hydrocarbons is used to produce plastic?
O Strand 2
O Strand 3
O Strand 4
●Strand 1
Answers
The strand 1 of hydrocarbons is used to produce plastic, hence option D is correct.
Raw resources like natural gas, oil, or plants that have been processed into ethane and propane are used to make plastics. The subsequent "cracking" procedure uses heat to transform ethane and propane into ethylene and propylene. To produce various polymers, these components are mixed.
Propylene is a substance found in large quantities in petroleum. In order to speed up chemical processes, refiners combine heated propylene with a catalyst to create plastic. Propylene molecules start to cluster together like beads on a thread as a result.
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you and your brother are playing chase me, and you accidentally (tear, cut, split) the front part of your rubber slipper. you saw a piece of safety pin on the sidewalk. what will you do to fix your slippers?
Answers
Fixing a rubber slippers whose front part was cut while playing would depend on the materials available at one's disposal.
The cut part of the slippers can be gummed to the rest of the slippers if a suitable gum is available. However, care must be taken to make sure that the cut part aligns with the original space where it detached from.
The cut part can also be fixed using a needle and thread assuming one has the relevant skills and the materials are available.
However, since only a piece of safety pin seen on the sidewalk is available to work with in this case, the most logical thing would be to find a way to use the pin to attach the cut part to the rest of the slippers via the the original space it detached from. This might not be the lasting solution, but the slippers might serve until a more lasting solution is obtained.
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What two types of changes to Earth's surface are illustrated in the model above ? A. Erosion of sand from the beach during winter B. Deposition of sand onto the beach during summer Erosion of sand from the beach during summer D. Deposition of sand onto the beach during winter
Answers
Answer: I’m pretty sure it is (deposition of sand onto the beach during summer) and (Erosion of sand from the beach during the winter)
Explanation:
Which is the best description of a molecule?
Answers
Answer:
a molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms
Answer:
: A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms.
Explanation:
i hope its right
Reflect on the learning activities titled “Hypothesis”, “Variables and Hypothesis” and “Constructing a Hypothesis”. Describe some similarities and differences between a question that comes in response to an observation, and a scientific research question? Cite quotes from the readings to support your answer. Where do variables fit into this thinking? In other words, if you imagine a number line with observation questions at one end and scientific research questions at the other, what role do variables play anywhere along this continuum?
Answers
The learning activities titled "Hypothesis," "Variables and Hypothesis," and "Constructing a Hypothesis" all share certain similarities and differences. A question that arises in response to an observation is similar to a scientific research question in that both require some level of investigation to achieve an answer. However, scientific research questions are typically more specific and refined, with a defined methodology for obtaining data and verifying results.
The following quotes from the readings illustrate this distinction:"A scientific question is one that can be answered by using scientific investigation. In contrast, an observation question is one that comes in response to observing or experiencing something in the natural world" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."An important feature of a scientific question is that it should be answerable within a reasonable amount of time and with the resources available" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."Research questions can be narrow or broad, depending on the scope of the research" (Constructing a Hypothesis).The concept of variables is crucial to both observation and scientific research questions, but they play different roles depending on where they fall on the continuum. Observation questions are usually less precise and may not require much consideration of variables. On the other hand, scientific research questions are likely to include a rigorous examination of variables and their potential effects."Variables are an essential part of a scientific experiment. They are the things that change in an experiment" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."Variables are important because they can affect the outcome of the research" (Constructing a Hypothesis).In summary, observation questions and scientific research questions share some similarities, but the latter is more specific, has a defined methodology, and may require more consideration of variables.For such more question on Hypothesis
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35. Explain what the Triple Point is and why the Triple
Point is never observed in Nature.
Help please
Answers
Answer:
In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases of that substance coexist in thermodynamic equilibrium. It is that temperatureand pressure at which the sublimation curve, fusion curve and vaporisation curve meet.
Answer:
At the triple point, all three phases (solid, liquid, and gas) are in equilibrium. Since the triple point is a point, there is only one temperature and one pressure where the three phases will exist. This fact often helps in identifying compounds or in problem solving.
Cellular respiration is a chemical process in cells that releases energy the cells need to function. What statement below is true about this reaction.
A. The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO2 and water is equal to the energy required to break the bonds of sugar and oxygen.
B. The process of cellular respiration releases energy because the energy that is released when the bonds that are formed in CO2 and water is lost when bonds of glucose and oxygen are broken.
C. The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO2 and water is less than the energy required to break the bonds of sugar and oxygen.
D. The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO2 and water is greater than the energy required to break the bonds of sugar and oxygen.
Answers
The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO\(_2\) and water is equal to the energy required to break the bonds of sugar and oxygen. Therefore, the correct option is option A.
Cells turn sugars into energy through a process called cellular respiration. Cells need fuel or an electron acceptor to power the chemical process that converts energy into usable forms such as ATP along with additional kinds of energy that can be utilised to power cellular reactions.
All multicellular species, including eukaryotes, as well as certain single-celled organisms, generate energy by aerobic respiration. Utilising oxygen, which is the strongest electron acceptor found in nature, is called aerobic respiration. The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO\(_2\) and water is equal to the energy required to break the bonds of sugar and oxygen.
Therefore, the correct option is option A.
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Guysss how to explain nuclear chemistry? And define nuclear chemistry ?
Answers
Answer:
How do amoeba respire.
Define Diffusion.
1. (1 point) The Sherlock Holmes story, the Sign of the Four, involves the Great Mogul
diamond. Before cutting, its weight was 787 carats. 1 carat = 0.200 gram. Assume that
the diamond is pure carbon. Calculate the number of moles of carbon in the uncut Great
Mogul diamond. Also calculate the number of carbon atoms.
Answers
no. of moles in uncut diamond are 13.11 mol and number of Carbon atoms are 78.94 × 10^23.
The atoms of diamond are grouped in a crystal structure known as diamond cubic, and it is a solid form of the element carbon. The chemically stable form of carbon is another solid form of carbon known as graphite at ambient temperature and pressure, but diamond transforms to it very slowly.We are aware that a mole is a unit of measurement for a substance that contains precisely the same number of atoms as 12 g of C12.The mass of a substance is given in this case. We are aware that the diamond is Carbon's allotrope.
weight of diamond before cutting = 787 carats
1 carat. = 0.200 gram
therefore, 787 carats. = 787 × 0.200
= 157.4 gram
To calculate the number of moles equation is
Number of moles =Mass / Molar mass
Molar mass of carbon Is 12g/mol
therefore, no. of moles = 157.4 / 12 = 13.11 mol
We know that 1 mol of any substance contains 6.022×10^23 atoms.
Here we have 13.11 mol of carbon. thus,
No. of Carbon atoms = 13.11 × (6.022×10^23 / 1 mol) = 78.94 × 10^23
Thus, 13.11 mol of diamond contain 78.94 × 10^23 number of Carbon atoms.
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Which hormones are secreted from the posterior pituitary gland?
Answers
Answer:
growth hormone is ur answer
Answer:
Explanation:
two hormones are secreted from posterior lobe i.e. oxytocin and vasopressin
Which of the following is an example of a physical change?
A
sugar and oxygen reacting to produce water and carbon dioxide
B
honey dissolving in tea
C
a raw egg being cooked
D
metal rusting after being left out in the rain
Answers
Answer:B
Explanation:B can be reversed.
Answer:
Explanation:
Physical properties are characteristics of matter not associated with a change in chemical composition. Identity of the molecules do not change. A physical change is a change in state without changing the composition (e.g., melting wax, freezing water, grinding solids into powders). Examples: density, color, melting and boiling points, evaporation, odor, taste, hardness, conductivity.
B. Honey dissolving in tea would be a physical change. The honey is not changing chemically but physically as it dissolves in the hot tea.
Most of the elements in group 1 are classified as
Answers
Answer:
alkali metals
Explanation:
:)
How does flame spread over liquid depend on the flash point?
Answers
What are the Relative Speed & distance of atoms depending on the state of matter?
Answers
Answer:
Explanation:
The relative speed and distance of atoms in a substance depend on the state of matter.
In a solid, atoms are closely packed together and have minimal movement or vibration. Their relative speed is low and their distance from one another is short.
In a liquid, atoms are still close together but have more movement and freedom of movement than in a solid. Their relative speed is slightly higher than in a solid, and their distance from one another is slightly longer.
In a gas, atoms are widely spaced and have a high degree of movement and freedom of movement. Their relative speed is much higher than in a solid or liquid, and their distance from one another is much greater.
In a plasma, atoms are ionized and have a high degree of movement and freedom of movement. Their relative speed is much higher than in a solid, liquid or gas, and their distance from one another is much greater.
what coefficient would balance the following equation ch4+_O2--> CO2+2H2O
Answers
\(\qquad\qquad\huge\underline{{\sf Answer}}\)
The balanced chemical equation for the shown reaction is :
\(\qquad \tt \:CH_4 + 2 \: O_2 \rightarrow CO_2 + 2 \: H_2O\)
Where, coefficient of
\( \textsf{CH4 is 1} \)\( \textsf{O2 is 2} \)\( \textsf{CO2 is 1} \)\( \textsf{H2O is 2} \)6.Observe the equation below 2 Fe2O3(s) + CO(g) Fe(s) + CO2(g)
i) Balance the equation
Answers
Answer:
the given equation is
Fe2o3+co-- Fe+co2
Balanced chemical equation is
Fe2o3 + 3co-- 2Fe+3co2
Gasoline is the common name for Octane which has the chemical formula of C8H12. How many carbon atoms are in three molecules of octane 3C8H18
Options:
A. 3
B. 24
C. 18
D. Impossible to determine with the information given.
E. 8
Answers
Answer:
D
Explanation: