The mass of water was determined by subtracting the mass of anhydrous NaC2H3O2 from the hydrated sample. The moles of each component were calculated based on their molar masses, and the ratio of moles of water to moles of NaC2H3O2 was found to be approximately 3:1.
To determine the ratio of moles of water to moles of NaC2H3O2 in the original hydrated compound, we first need to find the mass of the water that was in the sample. We subtract the mass of the anhydrous NaC2H3O2 from the original mass of the hydrated sample:
Mass of water = 3.677g (original mass) - 2.216g (anhydrous NaC2H3O2) = 1.461g
Next, we calculate the moles of NaC2H3O2 using its molar mass (82.03 g/mol):
Moles of NaC2H3O2 = 2.216g / 82.03 g/mol ≈ 0.0270 moles
We do the same for the water using its molar mass (18.02 g/mol):
Moles of water = 1.461g / 18.02 g/mol ≈ 0.0810 moles
Finally, we find the ratio of moles of water to moles of NaC2H3O2:
Ratio = Moles of water / Moles of NaC2H3O2 ≈ 0.0810 moles / 0.0270 moles ≈ 3
Therefore, the ratio of moles of water to moles of NaC2H3O2 in the original compound is approximately 3:1.
list 4 observations that suggest a chemical change is occurring
Lead oxide is formed when a lead cation that has a charge of 2+ combines with an oxygen anion that has a charge of 2-. Using the crisscross method, write the formula for lead oxide.
Answer : The formula for lead oxide is, [tex]PbO[/tex]
Explanation :
As we know that the lead is a metal having the atomic number 82. The symbol of lead is, (Pb). The charge on lead is (+2).
The element oxygen is the non-metal having the atomic number 8. The symbol of oxygen is, (O). The charge on oxygen is, (-2).
When the lead combine with the oxygen, it forms lead oxide. It is an ionic compound in which the a metal react with the non-metal and combine with the an ionic bond by the criss-cross method.
Hence, the formula of the lead oxide is, [tex]PbO[/tex]
A scientist is studying a shock wave from an earthquake. What kind of wave is being studying?
an electromagnetic wave
a gamma ray
a radio wave
a mechanical wave
Answer:
The correct answer is option : Mechanical wave.
Explanation:
Mechanical waves are the wave which requires any medium to travel or to propagate or we can say wave which transfers energy through medium.For example: sound waves, water waves etc.
Shock wave is the wave with speed larger than the normal speed of light moving in a medium.
An electromagnetic waves are the waves capable of travelling through empty space or vacuum.They are composed of electric field and magnetic field. The gamma ray and radio wave are the example of electromagnetic wave.
Answer:
D
Explanation:
What is the ph of a solution with a hydrogen ion h+ concentration of 10-8 m?
The reaction 2k(s) + br2(l) → 2kbr(s) is a(n) ______________ reaction.
Answer:
The correct answer is oxidation-reduction.
Explanation:
This reduction-oxidation reaction is given by the following semi-reactions:
[tex]Br_{2}[/tex] + 2 [tex]e^{-}[/tex] → 2 [tex]Br^{-1}[/tex] (reduction)
2 [tex]K^{0}[/tex] - 2 [tex]e^{-}[/tex] → 2 [tex]K^{1}[/tex] (oxidation)
[tex]Br_{2}[/tex] is an oxidation agent, K is a reducing agent.
This means that [tex]Br_{2}[/tex] oxidizes K by increasing its oxidation number from 0 to 1.
[tex]Br_{2}[/tex] is reduced, decreasing its oxidation number from 0 to -1.
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Covalent compounds occur __________. between a metal and a nonmetal that share electrons when nonmetals gain or lose electrons only between metals when nonmetals share electrons
What subatomic particle is specifically responsible for combining the atoms together to form a new substance?
The electron, through the formation of chemical bonds, is the subatomic particle responsible for holding atoms together, which allows for the creation of new substances.
The subatomic particle specifically responsible for holding atoms together to form new substances is the electron. Atoms are joined to one another through chemical bonds which involve the sharing or exchange of electrons between atoms. As atoms come together, these interactions give rise to molecules with distinct properties, transforming reactants into products during a chemical reaction. Hence, while protons determine the identity of an element, electrons are key to the formation of molecules and compounds, the building blocks of matter.
A neutral atom of neon has 10 electrons and an electron configuration of 1s2 2s2 2p6. How will it ionize to satisfy the octet rule?
A.It will lose 6 electrons from the 2nd energy level to have a valence configuration of 1s2 2s2.
B.It will lose 8 electrons from the 2nd energy level to have a valence configuration of 1s2.
C.It will gain 8 electrons in a 3rd energy level to have a valence configuration of 1s2 2s2 2p6 3s2 3p6.
D.It will not ionize; it already has an octet of electrons in its valence shell.
What element has the electron configuration 1s2 2s2 2p6 3s2 3p1?
The aluminum element has the electron configuration 1s²2s²2p⁶3s²3p¹.
What is a neutral atom?A neutral atom can be defined as one in which the number of protons (positive charge) is equal to the number of electrons ( negative charge ). The overall electric charge of a neutral atom is zero. Therefore, this kind of atom is called a neutral atom.
For a neutral atom, we generally say that the number of electrons should be equal to the number of protons. All chemical elements placed in the periodic table are in a neutral state.
The given electronic configuration has 13 electrons. The number of electrons in the valence shell is three so the element belongs to group 13 and the valence electron is filled in their electron shell so it is the element of the third period.
We know that the aluminum element has an atomic number of 13. Therefore, the given electronic configuration belongs to a neutral atom of the aluminum element.
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A 1.59-g sample of a metal chloride, mcl2, is dissolved in water and treated with excess aqueous silver nitrate. the silver chloride that formed weighed 3.60 g. calculate the molar mass of m.
To determine the molar mass of metal 'M', calculate the moles of AgCl formed using its molar mass, derive the moles of Cl in MCl2 from this, and calculate the mass of 1 mol of MCl2. Afterwards, rearrange the formula to compute the molar mass of M.
Explanation:To calculate the molar mass of metal (M), we are given that 3.60 g of AgCl is equivalent to 1.59 g of MCl2. From the periodic table, we know that the molar mass of AgCl is 143.3 g/mol and that of Cl is 35.45 g/mol.
Firstly, we need to calculate the moles of AgCl formed, that is 3.60 g / 143.3 g/mol = 0.0251 mol.
Each mole of AgCl produced comes from one mole of Cl. Moles of Cl in MCl2 = 0.0251 mol * 2 = 0.0502 mol. We multiply by 2 because each formula unit of MCl2 contains 2 Cl atoms. Hence, 1.59 g of MCl2 contains = 0.0502 mol of Cl.
So, the mass of 1 mol of MCl2 = (Molar mass of M + 2 * Molar mass of Cl). From this we can determine the molar mass of M = (Mass of 1 mol MCl2 – 2 * Molar mass of Cl) = (1.59 g / 0.0502 mol) - (2 * 35.45 g/mol) = approximately 36.82 g/mol.
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Aluminum is a group 3a metal. which ion does a1 typically form?
Final answer:
The typical ion formed by aluminum (Al), a group 3a metal, is the cation Al³+, due to the loss of its three valence electrons upon reaction.
Explanation:
The ion that aluminum (Al), which is a group 3a metal, typically forms is Al³+, an aluminum ion. This is because aluminum falls under group 13 of the periodic table and has the valence shell electron configuration of ns²np¹. When aluminum reacts, it tends to lose all three of its valence electrons, resulting in compounds with an oxidation state of 3+. This is observed in both covalent compounds and ionic compounds like AlF3 and Al₂(SO4)3. In aqueous solutions, aluminum ions are typically found as [Al(H₂O)6]³+, commonly abbreviated as Al³+ (aq).
Why is glycolysis considered by evolutionary theory to be one of the first metabolic pathways to have evolved?
Why did the use of steam during the industrial revolution lead to an interest in understanding the atom?
The use of steam during the Industrial Revolution led to an interest in understanding the atom due to technological advancements, energy transformation, and scientific progress.
Explanation:The use of steam during the Industrial Revolution led to an interest in understanding the atom for several reasons:
Technological Advancements: The development of the steam engine revolutionized transportation and manufacturing. This new technology powered factories and modes of transportation, leading to increased curiosity about the principles behind it.Energy Transformation: Steam engines transformed thermal energy from burning coal into kinetic energy, providing a practical example of energy conversion. This prompted scientists to study the fundamental nature of energy and its relationship to atoms.Scientific Progress: The Industrial Revolution marked a period of scientific and technological advancements. As a result, there was a growing interest in understanding the building blocks of matter, including atoms, as scientists sought to explain and improve upon the new industrial technologies.Based on the information contained in the figure above, do you think that neon has any isotopes? Explain your answer.
Based on the figure, Neon has an atomic number of 10 and a Mass number of 20.18. We must take note that the atomic number is equal to the number of protons, while the Mass number is equal to the number of protons PLUS neutrons, so:
number of protons = 10
protons + neutrons = 20.18
hence,
10 + neutrons = 20.18
number of neutrons = 10.18
A neutron can be a considered as a whole single atom so it cannot have a decimal. The only way that the number of neutrons is fractions is only when it is a combination of isotopes. So the answer is:
Yes, Neon has isotopes
Calcium must lose two electrons to get a full outer shell. what is the name of the group to which calcium belongs
A solid tablet is dropped into a glass of water. The tablet completely dissolves after a few minutes.
Dissolving the solid tablet in water is a physical change as the chemical composition of the substance doesn't change.
What is a physical change?A physical change can be described as a change that occurs when some of the features of the matter change but the identity does not. Physical changes are dived into categories as reversible and irreversible. For example, the melting of ice is a reversible physical change as the melted ice can be refrozen.
Physical change can be described as a kind of change where only the physical properties of a substance such as color, odor, solubility, etc. can undergo change. During physical changes, no chemical bonds between atoms in the substance are broken or formed.
The chemical composition as well as the nature of matter remains unchanged during a physical change. The molecules of the substance can be rearranged without changing the internal composition.
Dissolving the solid tablet in water can not change the chemical composition of the tablet while the carbon tablet undergoes a chemical reaction with water and produce carbon dioxide.
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Final answer:
The question is about the chemical process of a solid dissolving in water, known as dissolution. Factors like stirring, temperature, and surface area can affect the rate of dissolution, with practical applications observed in dissolving salt or sugar.
Explanation:
The process of a solid tablet dissolving in water is a chemical phenomenon where the solid substance breaks down and disperses throughout the liquid, forming a homogeneous solution. This is termed dissolution. The rate of dissolution can be influenced by several factors, such as stirring, temperature, and the surface area of the solid. To illustrate, consider the dissolution of table salt (NaCl) in water, which breaks apart into its constituent sodium and chloride ions, each surrounded by water molecules.
The faster dissolution of granulated sugar compared to sugar cubes in tea serves as a practical example of how surface area affects dissolution rates. Heating can also accelerate the process, as seen when a solute dissolves more quickly in hot water.
In experiments such as adding an effervescent tablet to a balloon over a test tube of water, we can observe not only dissolution but also possibly a chemical reaction releasing gas, which inflates the balloon. To further understand these processes, students might perform exercises such as determining mass before and after dissolution or crystallization practices that involve the careful addition and heating of solvents to dissolve solids.
What turns blue litmus paper red and have a ph greater than 7?
What conditions lead to the formation of large crystals in an igneous rock?
What type of substance would result from the bonding of elements carbon and chlorine?
Select one:
a. None of the answer choices
b. Ionic
c. Metallic
d. Covalent
What must always be true about a chemical reaction based on chemical reactions?
What is the name of the following formula: P4O10
a
tetraphosphorus decoxide
b
phosphorus (X) oxide
c
diphosphorus octoxide
d
phosphorus oxide
The name of the following chemical formula P₄O₁₀ is tetraphosphorus decoxide .
What is chemical formula?
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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HELP PLEASE!!! Write the chemical equation and balance it!!!
Aluminum phosphate and nickel (II) sulfide react to form aluminum sulfide and nickel (II) phosphate.
The balanced chemical equation for the reaction between aluminum phosphate and nickel (II) sulfide to form aluminum sulfide and nickel (II) phosphate is: 2 AlPO4 + 3 NiS → Al2S3 + Ni3(PO4)2.
Explanation:When aluminum phosphate reacts with nickel (II) sulfide, the resultant products are aluminum sulfide and nickel (II) phosphate. The unbalanced chemical equation for the reaction is:
AlPO4 + NiS → Al2S3 + Ni3(PO4)2
To balance the equation, it can be observed that there are 2 aluminum atoms on the right side and thus we will need 2 units of AlPO4 on the left side to ensure the balance of aluminum. Similarly, the 3 nickel atoms on the right side come from 3 units of NiS on the left. Phosphorus and sulfur atoms are already balanced with 1 phosphate ion on the left side and 1 sulfide ion on the right side. As a result, the balanced chemical equation is:
2 AlPO4 + 3 NiS → Al2S3 + Ni3(PO4)2
Both black and white road surfaces absorb sunlight. the warmer road surface at the end of a sunny day is the
Black vs. white surfaces' heat absorption and radiation explained.
Black is a better absorber and radiator of heat compared to white. On a sunny day, black surfaces such as asphalt get hotter than lighter surfaces like gray sidewalk because black absorbs heat more efficiently. Conversely, at night, black surfaces cool down faster than lighter surfaces due to their better radiative properties.
The volume of one mole of a substance is 22.4 L at STP for all ____.
A. Gases
B. Liquids
C. Solids
D. Compounds
The hydrogen-bond lattice causes water to have an unusually ____ specific heat, an unusually ____ heat of vaporization and an unusually ____ density in solid form. high; high; low
A substance made of copper atoms and chlorine atoms combined together will have the same chemical properties as copper and chlorine individually. question 3 options: true false
How many stereoisomers are possible for 1 2-dichlorocyclopentane?
The heat required to change a unit mass of a solid to a liquid at the melting point is called the
If you wish to warm 52 kg of water by 22 ∘c for your bath, find what the quantity of heat is needed. express your answer in calories cal.
1144000 cal is the quantity of heat is needed to warm 52 kg of water by 22 [tex]\rm ^oC[/tex] for bath.
Heat is the energy that spontaneously transfers between systems or things as a result of temperature changes in chemistry. Conduction, convection, or radiation are all possible methods of transmission. Temperature changes result through heat exchange, which frequently occurs during chemical reactions. The rate of reactions, phase transitions, and general system behaviour are all strongly influenced by this thermal energy transfer. Understanding the dynamic behaviour of matter at the molecular level requires an understanding of heat, which can be measured in quantities like joules or calories.
Q= mc(T2-T1)
m= 52 kg,
T2-T1 = 22 [tex]\rm ^oC[/tex]
C= 1 cal/g[tex]\rm ^oC[/tex]
Q= 52000g x 1 cal/g[tex]\rm ^oC[/tex] x 22C
= 1144000 cal
C= 4.184 joules/kg[tex]\rm ^oC[/tex]
Q= 52 kg x 4.184 joules/kg[tex]\rm ^oC[/tex]x 22
= 4786.496Joules
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To warm 52 kg of water by 22°C, we must first convert the mass of water to grams and then apply the specific heat of water formula. Calculating through gives us 4,787,776 joules, but requested in calories, we convert the joules to give approximately 1,144,591.5 calories of heat energy.
Explanation:The specific heat of water is 4.184 J/g °C. When we translate this into more understandable terms, it means that it takes 4.184 joules of energy to raise one gram of water by one degree Celsius. Now, to find out how much heat is needed to warm your volume of water, we must use the specific heat equation: Q = mcΔT, where 'Q' is the heat energy, 'm' is the mass of the substance being heated (in this case, water), 'c' is the specific heat of the substance, and 'ΔT' is the change in temperature.
Now all we do is substitute the relevant values into the equation: Q = 52,000g * 4.184 J/g°C * 22°C. The g (grams) cancel out, as do the °C (degrees C), leaving us with Q = 4,787,776 joules. However, you wished to express the answer in calories. To convert from joules to calories, we must remember that 1 cal = 4.184 J. So, Q = 4,787,776 / 4.184 = 1,144,591.5 cal.
Thus, you would need approximately 1,144,591.5 calories of heat energy to warm 52 kg of water by 22°C for your bath.
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How is vapor pressure influenced by the strength of intermolecular forces?