Metallic character increase to the lower left of the periodic table.
What is periodicity?Periodicity is the regular variation in the properties of an element across a period and down a group.
The following properties of elements show periodicity:
metallic character,non-metallic character,atomic radius, ionization energy,electronegativityThe properties that shows increasing trend to The lower left of the periodic table is metallic character.
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How do you separate a honey and water solution?
Answer:
Keep it undisturbed for some time and let it settle down. Then use a separating funnel, to separate them both
Explanation:
How many moles of water form
when would be required to react
with 183.5 g Ba(OH)2 reacts with
excess HBr?
2HBr + Ba(OH)2 → BaBr2 + 2H₂O
[?] mol H₂O
Calculate how many grams would be required to prepare 600. 0 ml of 0. 150 m of naf? molar mass of naf is 41. 9 g/mo
Considering the definition of molarity and molar mass, the mass of NaF required is 3.771 grams.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liters}[/tex].
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Mass of NaF requiredIn this case, you know:
molarity= 0.15 M= 0.15 [tex]\frac{moles}{L}[/tex]number of moles= ?volume= 600 mL= 0.6 LReplacing in the definition of molarity:
[tex]0.15\frac{moles}{L} =\frac{number of moles}{0.6 L}[/tex]
Solving:
0.15 [tex]\frac{moles}{L}[/tex] × 0.6 L= number of moles
0.09 moles= number of moles
The molar mass of NaF is 41. 9 g/mol. So, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 41.9 grams, 0.09 moles of the compound contains how much mass?
[tex]mass=\frac{0.09 molesx41.9 grams}{1 mole}[/tex]
mass= 3.771 grams
Finally, the mass of NaF required is 3.771 grams.
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Using the balanced chemical equation, determine the
number of moles of aluminum required to react with 7.53
mol of chlorine.
2Al(s) + 3Cl2(g) -> 2AlCl3(s)
Answer:
5.02 mol
Explanation:
n(Al) : n(Cl)
2 : 3
x : 7.53
3x = 15.06
n(Al) = 5.02mol
how can one establish whether a liquid sample extracted from a plant is pure
A student needs to standardize a base solution by titration with an acid solution of known concentration. She finds the volume of the acid solution needed to reach the endpoint for a sample of the base solution. Arrange the steps in the order that will allow her to determine the concentration of the base solution.
The steps usually involves adding the known solution (the titrant) to a known quantity of the unknown solution (the analyte) until the reaction is complete which can be understood in detail as below with the help of through out process of titration.
What is Titration ?A titration is a technique used to work out the concentration of an unknown solution based on its chemical reaction with a solution of known concentration.
Steps in order to determine the concenteration of base solution ;
(Acid-Base Titration)
Choose the titrant.Choose the titrate.Select the normality of the titrate.Choose the volume of the liquid to be pipetted out.Select the indicator.Start titration.End point is noted at the colour change of the solution.From the final reading the normality of titrant can be calculated by the equation:N₁V₁=N₂V₂
After finding the normality, the amount of given substance in the whole of the given solution can be calculated by the equation:Mass = Equivalent weight x Normality \ Volume {1000}
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How many grams of Ag2S2O3 form
when 125.0 g AgBr reacts completely
according to the reaction below?
2AgBr + Na2S2O3 → Ag2S₂O3 + 2NaBr
Taking into account the reaction stoichiometry, 109.09 grams of Ag₂S₂O₃ are formed when 125 g AgBr reacts completely.
Reaction stoichiometryIn first place, the balanced reaction is:
2 AgBr + Na₂S₂O₃ → Ag₂S₂O₃ + 2 NaBr
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
AgBr: 2 moles Na₂S₂O₃: 1 moleAg₂S₂O₃: 1 mole NaBr: 2 molesThe molar mass of the compounds is:
AgBr: 187.77 g/moleNa₂S₂O₃: 158 g/moleAg₂S₂O₃: 327.74 g/moleNaBr: 102.9 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
AgBr: 2 moles ×187.77 g/mole= 375.54 gramsNa₂S₂O₃: 1 mole ×158 g/mole= 158 gramsAg₂S₂O₃: 1 mole ×327.74 g/mole= 327.74 gramsNaBr: 2 moles ×102.9 g/mole= 205.8 gramsMass of Ag₂S₂O₃ formedThe following rule of three can be applied: if by reaction stoichiometry 375.54 grams of AgBr form 327.74 grams of Ag₂S₂O₃, 125 grams of AgBr form how much mass of Ag₂S₂O₃?
[tex]mass of Ag_{2} S_{2} O_{3} =\frac{125 grams of AgBrx327.74 grams of Ag_{2} S_{2} O_{3}}{375.54 grams of AgBr}[/tex]
mass of Ag₂S₂O₃= 109.09 grams
Then, 109.09 grams of Ag₂S₂O₃ are formed when 125 g AgBr reacts completely.
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Short Response
Directions: Base your answers to questions 6 and 7 on the information below and your knowledge of chemistry.
Ammonia, NH3(g), can be used as a substitute for fossil fuels in some internal combustion
engines. The reaction between ammonia and oxygen in an engine is represented by
the unbalanced equation below.
NH3(g) + O₂(g) → N₂(g) + H₂O(g) + energy
6. Balance the equation in the space below for the reaction of ammonia and oxygen, using the
smallest whole-number coefficients.
7. Show a numerical setup for calculating the mass, in grams, of a 4.2-mole sample of 0₂. Use 32
g/mol as the gram-formula mass of 0₂.
Answer:
6.)
7.) 134.4 g O₂
Explanation:
The unbalanced equation:
NH₃ (g) + O₂ (g) ---> N₂ (g) + H₂O (g) + energy
Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen
Products: 2 nitrogen, 2 hydrogen, 1 oxygen
The balanced equation:
4 NH₃ (g) + 3 O₂ (g) ---> 2 N₂ (g) + 6 H₂O (g) + energy
Reactants: 4 nitrogen, 12 hydrogen, 6 oxygen
Products: 4 nitrogen, 12 hydrogen, 6 oxygen
To convert from moles to grams, you need to multiply the starting value (4.2 moles) by the molar mass (32.00 g/mol). The molar mass can serve as a conversion because it technically means there are 32.00 grams O₂ per every 1 mole. It is important to arrange this ratio in a way that allows for the cancellation of units (the desired unit should be in the numerator).
4.2 moles O₂ 32.00 g
-------------------- x ---------------- = 134.4 g O₂
1 mole
what is chemical energy
Answer:
chemical energy is the energy of a chemical substance that is stored in the bonds of chemical compounds and is released when they undergo a chemical reaction and transform into another substance
several balls and sticks glued together to represent a molecule
Answer:
The different elements are represented by their symbols one line shows a single bond and two lines show a double bond. This written representation is called a structural diagram
What is the name of this molecule?
Answer:
The name of this molecule structure is 1-Butyne
The name of the given molecule according to IUPAC is 1-Butyne. Thus, option C is correct.
What is IUPAC nomenclature?The IUPAC nomenclature is given as the standard naming technique that is used to name a chemical compound. It is named with the following main rules.
The triple bond compound is an alkyne with the suffix -yne. The development of the name to the given structure is therefore given by counting the number of carbon atoms, and the location of the triple bond.
There are 4 carbon atoms in the structure with the triple bond at carbon 1, therefore the name will be 1-Butyne. Hence, option C is correct.
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Figure 2 shows what happens to the electrons in the outer shells when a sodium atom reacts with a fluorine atom.
The dots (•) and crosses (x) represent electrons.
Describe, as fully as you can, what happens when sodium reacts with
fluorine to produce sodium fluoride.
Sodium reacts with fluorine to make a covalent bond between them. A covalent bond is formed when there is a mutual sharing of electrons between the two adjacent atoms.
Here, Sodium is metal and fluorine is non-metal. So, the bond between them may be an ionic bond, but as the Sodium has one valence electron and fluorine is highly electronegative. Sodium wants to lose electrons and fluorine wants to gain electrons to form a chemical bond. Therefore, the sodium donates its valence electron to fluorine, forms a cation, and fluorine accepts the electron and forms an anion and they distribute the difference in the charge between them.
So, we can say that when sodium and fluorine react to form sodium fluoride with a covalent bond.
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1. 10.0 g of CaCO 3 on heating gave 4.4 g of CO 2 and 5.6 g of CaO. The observation is in agreement with the law of conservation of mass.
2. hydrogen and oxygen are combined to form two compounds the hydrogen content in one of the compound is 5.93 % and another is 11.2 % is this obey the law of multiple proportion.
3. On analysis it was found that the black oxide of Copper and red oxide of copper contains 80 and 89% of copper respectively Is this obeys the law of multiple proportion.
4.when 8.4 G of NaHco3 is added to the solution of Acetic Acid weighing 20 gram if it is observed that 4.4 gram of Co2 is released into the atmosphere and Residue is left Behind what is the mass of left Residue.
Answer:
According to the law <br> Mass of reactants = mass of product, here <br> `underset(10 g)(CaCO_(3))rarr underset(4.4 g)(CO_(2))+underset(x)(CaO)` <br> Hence, x = 10 g - 4.4 g = 5.6 g <br> Which is mass of CaO.dIn the first compound <br> Hydrogen = 5.93 % <br> Oxygen = `(100-5.93)% = 94.07 %` <br> In the second compound <br> Hydrogen = 11.2 % <br> Oxygen `= (100-11.2)%=88.8%` <br> In the first compound the number of parts by mass of oxygen that combine with one part by mass of hydrogen `=(94.07)/(5.93)=15.86` parts ...(The ratio of Cu combining with fixed weight of oxygen in black and red oxide is 1 : 2 respectively. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.) {Check something more in the above attachment!}Refer to the above attachmentExplanation:
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A calorimeter absorbs 2,508 J of energy from the snack shown in the data below. How much energy does the snack provide per
gram (J/g) according to the experiment?
The energy provided by the snack is obtained as 1254 J/g.
What is the energy of the snack?The calorimeter is used to measure the energy content of food. The food is burnt in the calorimeter in order to determine the amount of energy that it contains. The mass of the food burnt is converted to energy.
Mass of food burnt = 3.52 g - 1.52 g = 2 g
The energy that is provided by the snack in J/g = 2,508 J/ 2 g
= 1254 J/g
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Will sodium iodide react with bromine to produce sodium bromide and iodine? Why or why not?
Question 10 options:
A) Yes, because bromine has lower activity than iodine
B) No, because bromine has higher activity than iodine
C) No, because bromine has lower activity than iodine
D) Yes, because bromine has higher activity than iodine
I believe its either B or D
Answer:
C
Explanation:
The higher the period the higher the activity of an element, therefore, since iodine is in period 6 and bromine is in period 5, the described reaction is not possible due to the fact that bromine is less active
Select the correct answer.
What is the purpose of the arrow in a chemical equation?
OA. It indicates the direction in which the reaction occurs.
OB.
It separates the elements from the compounds.
OC.
It indicates the direction of increase in the number of molecules.
It indicates the direction of heat movement in a reaction.
O D.
Reset
Next
Answer: A. It indicates the direction in which the reaction occurs.
One of the postulates of bohr's atomic model of a moving electron is that angular momentum of a moving electron is quantized. Explain its meaning and calculate the angular momentum of third orbit (i.e n=3)
The angular momentum of an electron in the third Bohr orbit of a hydrogen atom is given by mvr=3h÷2π
What is momentum?Momentum is defined as the amount of motion occurring in something that is moving, or the force that drives something forward to keep it moving.
Bohr never assumed stable electronic orbits with the electronic angular momentum quantized as
l=mvr = [tex]\frac{nh}{2pi}[/tex]
Quantization of angular momentum means that the radius of the orbit and the energy will be quantized as well.
Bohr assumed that the discrete lines seen in the spectrum of the hydrogen atom were due to transitions of an electron from one allowed orbit/energy to another.
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What is the answer to “An element is:”
Answer:
Option A
A pure chemical substance consisting of one type of atom.
Explanation: An element is a pure substance and is made of only one type of atom; it cannot be broken down into a simpler substance.
An element is defined as a pure chemical substance consisting of one type of atom.
What is an element?
It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.There are 118 elements known to exist either naturally or artificially.
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Why do you think it is important to record your data with all the decimals provided by the instruments even if they are zero? how does this help with data analysis?
It is important to record your data with all the decimals provided by the instruments even if they are zero because it increases the accuracy of the measurement.
What is accuracy in experimentation?Accuracy refers to the ability to take correct measurement values during a specific experiment and/or observational procedure.
Accuracy is a fundamental issue in data analysis and helps to obtain conclusions from a given experimental procedure.
In conclusion, it is important to record your data with all the decimals provided by the instruments even if they are zero because it increases the accuracy of the measurement.
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Prepare a project report on various samples of
a) a mixture
b) a compound
c) an element ( metal or non metal)
( 2 from each ) highlighting the main characteristics features of elements, compounds and mixtures.
Answer:
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Explanation:
Any substance that contains only one kind of an atom is known as an element. Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P4) or sulfur (S8) cannot be broken down into simpler substances by these reactions
Example: Water decomposes into a mixture of hydrogen and oxygen, on the other hand, cannot be decomposed into simpler substances. They are therefore the elementary, or simplest, chemical substances elements.
Each element is represented by a unique symbol. The notation for each element can be found on a periodic table of elements.
The elements can be divided into three categories that have characteristics properties: metals, nonmetals and semimetals. Most elements are metals, which are found on the left and toward the bottom of the periodic table. A handful of nonmetals are clustered in the upper right corner of the periodic table. The semimetals can be found along the dividing line between the metals and the nonmetals.
Which of the following is the best definition of a chemical change?
A. A change in a substance where one or more new substances form
B. A change in a substance where no new substance forms
C. A change in a substance where energy is conserved
OD. A change in a substance where a phase change occurs
Answer:A is correct
Explanation:
If a substance can be given a chemical formula can be considered to be a(n) __________.
If a substance can be given a chemical formula can be considered to be a(n) compound.
What is a compound?A pure substance made up of two or more different elements combined chemically in a fixed ratio is called a compound.
Compounds are substances composed of different elements bonded chemically; only chemical reactions break the chemical bonds or create new chemical bonds leading a compound to form other substances.
Hence, if a substance can be given a chemical formula can be considered to be a(n) compound.
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