Answer:
Science textbooks around the world have become suddenly out of date. Four new chemical elements have been added to the periodic table. A big decision now lies ahead - elements 113, 115, 117 and 118 need to be given their official names and symbols.
New elements can be named after a mythological concept, a mineral, a place or country, a property or a scientist. The names have to be unique and maintain "historical and chemical consistency" . This means a lot of "-iums".
"They're Latinising the name," explains chemist Andrea Sella of University College London. "The most recent tradition has been to name them after places or after people." The places chosen tend to be where the element was discovered or first manufactured. The Swedish village of Ytterby has managed to get four named after it (ytterbium, yttrium, erbium and terbium).
No-one has yet named an element after themselves but many elements are named in tribute to important scientists. Albert Einstein was given einsteinium. This can also be a way of righting the wrongs of the past. "Lise Meitner was really the chemist who spotted nuclear fission but she was never really recognised for it because she was Jewish and a woman," says Sella. "To be able to give an element a name that reminds us of her is I think greatly important."
The naming process isn't quick. The scientists who discovered them will start things off by proposing a name. But it will be down to the International Union of Pure and Applied Chemistry (IUPAC) to approve it. A special division of the US-based group has to accept the proposal. There is then a public review period of five months before the IUPAC council gets the final approval. Once it's ready, the name is announced in the scientific journal Pure and Applied Chemistry .
Scientists sometimes get creative. Mythical names have proved popular. Promethium was named after a character from a Greek legend who stole fire from the gods to give to humans and was punished by being chained to rock so an eagle could feed on his liver. The name was meant to reflect the fact that synthesising new elements often requires sacrifice.
There is hidden meaning in the table - as in the naming of praseodymium and neodymium. They replaced didymium - wrongly thought to be an element but in fact a mixture of the two. "The reason I like them is because they're called the green twin and the new twin," says Sella. "Didymium was named after [the Greek for] twin but in fact it also means testicles."
Naming an element is not just about functionality. "There's a tremendous romance to this," he adds. "Names are always important."
Your friend challenged you to a race you know in order to beat him you must run 15 meters within 20 seconds in the northern direction what does your average velocity need to be to win the race
.5 meters per second north
.75meters per second north
1.3meters per second north
300 meters per second north
Answer:
.75 meter north
Explanation:
v = d/t
v = 15/20
v = .75
Pure magnesium metal is often found as ribbons and can easily burn in the presence of oxygen. When 3.28 g of magnesium ribbon burns with 7.25 g of oxygen, a bright, white light and a white, powdery product are formed. Enter the balanced chemical equation for this reaction. Be sure to include all physical states. equation: What is the limiting reactant? magnesium oxygen The reaction goes to completion, but in the process of recovering the product, some of it was lost. The the percent yield for the reaction is 83.7%. How many grams of product are recovered? mass of product recovered: g How many grams of the excess reactant remain? Assume the reaction goes to completion. mass of excess reactant: g
Answer:
2 Mg(s) + O2(g)→ 2 MgO(s)
Explanation:
Number of moles of magnesium reacted = mass/ molar mass = 3.28g/24gmol-1 = 0.137 moles
From the balanced reaction equation;
2 moles of Mg yields 2 moles of MgO
0.137 moles of Mg yields 0.137 moles of MgO
For oxygen;
Number of moles of oxygen reacted = mass/ molar mass = 7.5g/32gmol-1 = 0.234 moles of O2
If 2_moles of oxygen yields 2 moles of MgO
0.234 moles of oxygen yields 0.234 moles of MgO
Hence Mg is the limiting reactant
Theoretical yield of MgO = 0.137 moles × 40 gmol-1 = 5.48 g of MgO
% yield of MgO = 83.7%
But
% yield = actual yield/theoretical yield × 100
actual yield = % yield × theoretical yield / 100
actual yield= 83.7 × 5.48/100
Actual yield = 4.59 g
According to the equation;
2 moles of Mg reacts with 2 moles of oxygen
Hence 0.137 moles of Mg will react with 0.137 moles of O2
Amount of excess reactant = 0.234 moles - 0.137 moles = 0.097 moles
Mass of excess reactant = 0.097 moles × 32gmol-1 = 3.1g of O2
How many moles are in 34.51 L of C*O_{2} assuming the gas is at STP
Which two variables determine the gravitational force between two objects?
A) their densities and the distance separating them
B) their masses and the distance separating them
C) their volumes and magnetic strengths
D) their masses and relative densities
Answer:
B
Explanation:
I did the test
how would you separate a mixture of oil,water and sand?plz help
Answer:
1) Filter the mixture, Sand will remain on the filter paper. 2) Then pour the mixture of mustard oil and in separating funnel. Water will settle down at bottom and mustard oil will float on it. Then open the stopcock of the separating funnel and pour out the lower layer of water.
Explanation:
How do you write 0.714 in scientific notation
Answer:
0.714 in scientific notation is 7.14 × 10-1.
Answer: m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.
Explanation:
1) Move the decimal 1 times to right in the number so that the resulting number, m = 7.14, is greater than or equal to 1 but less than 10
2) Since we moved the decimal to the right the exponent n is negative
n = -1
3) Write in the scientific notation form m × 10n
= 7.14 × 10-1
Therefore,
7.14 × 10-1 is the scientific notation form of 0.714 number and 7.14e-1 is the scientific e-notation form for 0.714
calculate the enthalpy change CH3COOH + CH3OH→ CH3COOCH3 + H2O
Answer:
The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The listed Reaction acts as a link to the relevant references for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.
Explanation:
Which is defined as the energy required to remove an electron from an atom of an element?
A electronegativity
B ionization energy
C ionic radius
D law of octaves
What is true for ALL of the examples of electromagnetic waves?
Given what we know, we can confirm that the one property listed that is universal for all of the electromagnetic waves listed is that they all move at the same speed in a vacuum.
What are electromagnetic waves?These are a specific type of wave. These waves are the result of interactions between an electric field and a magnetic field. These waves have many properties and can be of many distinct types, however, one universal property of these waves is that all of them will move at the same speed whilst in a vacuum.
Therefore, we can confirm that the one property listed that is universal for all of the electromagnetic waves listed is that they all move at the same speed in a vacuum.
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Based on the information in the table which two elements are most likely in the same groans why
True or false is NaOH an example of salt ?
Answer:
Salts of Weak Acids and Strong Bases are slightly basic with a pH of greater than 7 . For Example: NaOH (Sodium Hydroxide) , a strong base , when reacted with a weak acid , H 2 CO 3 (Carbonic acid) , gives a basic salt Na 2 CO 3 (Sodium Carbonate) which has a pH of higher than 7.
hope this helps
how do i draw these lines?
bro is that genius cast that's an easy line
I can easily draw that
What variable is assumed to be constant whrn using the combined gas law
Explanation:
the formula of combined gas law = PV/T
:• PV/T = K
K is constant
Ammonia is often used as a cleaning fluid. In order to make the strongest possible solution of ammonia, would you use hot water or cold water? Why?
Based on the effect of temperature on reaction rate, to make the strongest possible solution of ammonia, it is best to use hot water.
How does temperature affect the rate of a chemical reaction?The rate of a chemical reaction is increases with increase in temperature.
This increase in rate of reaction is observed because the number of particles with energy greater than or equal to the activation energy increases.
Therefore, to make the strongest possible solution of ammonia, it is best to use hot water.
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How should scientists set up the control group in this experiment?
Answer:
Please show a file so I can answer your question or tell me which experiment.
Explanation:
Definition:The control group (sometimes called a comparison group) is used in an experiment as a way to ensure that your experiment actually works. It's a way to make sure that the treatment you are giving is causing the experimental results, and not something outside the experiment.
The nutrition label tells us that 13 g of a serving of gummy bears (i.e. 10 gummy bears) is made of sugars. Let's assume that all of the sugar is sucrose. The balanced reaction for the combustion of sucrose is given below. How much heat is released from the combustion of the sucrose in a single gummy bear?
2C12H22O11+24O2→24CO2+22H2O ΔHrxn=−11,286kJ
This problem is providing the mass of gummy bears which are assumed to contain 13 g of sucrose, which undergoes combustion and produces -214.3kJ of heat according to the following:
Heat of reactionIn chemistry, when a fuel undergoes combustion, a reaction with oxygen, it produces carbon dioxide and water in a complete combustion. In such a way, with the given reaction, we can write the heat of reaction as -11,286 kJ per mole of reaction:
[tex]\Delta H=-11,286\frac{kJ}{mol\ rxn}[/tex]
Which means that if we need the total heat released by 13 g of sucrose, one must apply the following dimensional analysis including this fuel's molar mass (342.3 g/mol):
[tex]Q=-11,286\frac{kJ}{mol\ rxn}*\frac{1mol\ rxn}{2molC_1_2H_2_2O_1_1}*13gC_1_2H_2_2O_1_1 *\frac{1molC_1_2H_2_2O_1_1}{342.3gC_1_2H_2_2O_1_1} \\\\Q=-214.3kJ[/tex]
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A ball of mass 0.3 kg is released from rest at a height of 8 m. How fast is it going when it hits the ground? Acceleration due to gravity is g = 9.8 m/s2.
Group of answer choices
2.4 m/s
8.2 m/s
12.5 m/s
13.1 m/s
Answer:
C. 12.5 m/s
Explanation:
h = h(0) - gt²/2
0 m = 8 m - 9.8 m/s²*t²/2
- 8 m = - 9.8 m/s²*t²/2
16 m = 9.8 m/s² * t²
t² = 16/9.8 s²
t = √(16/9.8) s
v = v(0) + gt
v = 0 +gt
v = 9.8 m/s² * √(16/9.8) s ≈ 12.5 m/s
Select the statements that are TRUE about dilution. Note: You must select ALL the statements to earn credit. Partial answers will not receive partial credit. Group of answer choices The number of moles of substance remains the same during a dilution. Dilution is a process of decreasing the solution's concentration by the addition of a solvent. The diluted solution will have a higher concentration than the stock solution. In the dilution formula, M1V1
The statement that are true about dilution are:
The number of moles of substance remains the same during a dilution,Dilution is a process of decreasing the solution's concentration by the addition of a solventThe properties of dilutionDilution of a solution is the process by which more solvent that makes up a solution is added to the solution to decrease it's concentration.
The properties of a solution that is diluted include the following:
The boiling point of the solution is elevatedThe is decrease in the freezing pointThere is decrease of osmotic pressure.In dilution, the amount of solute does not change, the number of moles are the same before and after dilution.
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6. When 45.0 g of water is heated from 25.0 0C to 40.0 °C, how much energy was absorbed
during the process?
Help please due 11:59 tonight
Answer:
2835J
Explanation:
Q = mcΔT
Given,
Q = ?m = 45.0 gc = 4.2ΔT = 40-25 = 15°CQ = 45 × 4.2 × 15
Q = 2835 J
For the reaction shown, calculate how many grams of each product form when the following amounts of reactant completely react to form products. Assume that there is more than enough of the other reactant.
2Al(s)+Fe2O3(s)→Al2O3(s)+2Fe(l)
a) Calculate the mass of Al2O3 formed when 4.1 g of Al completely reacts.
Express your answer using two significant figures.
b)Calculate the mass of Fe formed when 4.1 g Al completely reacts.
Express your answer using two significant figures.
c)Calculate the mass of Fe formed when 4.1 g Fe2O3 completely reacts.
Express your answer using two significant figures.
According to the given balanced equation:
a) 4.1 g of Al form 7.7 g of Al₂O₃.b) 4.1 g of Al form 8.5 g of Fe.c) 4.1 g of Fe₂O₃ form 2.9 g of Fe.We want to calculate the mass of products when certain amounts of reactants react. This is a stoichiometry problem.
What is stoichiometry?Stoichiometry refers to the relationship between the quantities of reactants and products before, during, and following chemical reactions.
Let's consider the following balanced equation.
2 Al(s) + Fe₂O₃(s) → Al₂O₃(s) + 2 Fe(l)
a) Calculate the mass of Al₂O₃ formed when 4.1 g of Al completely reacts.
The mass ratio of Al to Al₂O₃ is 53.96:101.96.
4.1 g Al × 101.96 g Al₂O₃/53.96 g Al = 7.7 g Al₂O₃
b) Calculate the mass of Fe formed when 4.1 g Al completely reacts.
The mass ratio of Al to Fe is 53.96:111.70.
4.1 g Al × 111.70 g Fe/53.96 g Al = 8.5 g Fe
c) Calculate the mass of Fe formed when 4.1 g Fe₂O₃ completely reacts.
The mass ratio of Fe₂O₃ to Fe is 159.69:111.70.
4.1 g Fe₂O₃ × 111.70 g Fe/159.69 g Fe₂O₃ = 2.9 g Fe
According to the given balanced equation:
a) 4.1 g of Al form 7.7 g of Al₂O₃.b) 4.1 g of Al form 8.5 g of Fe.c) 4.1 g of Fe₂O₃ form 2.9 g of Fe.Learn more about stoichiometry here: https://brainly.com/question/16060223
Solve 9 × 5 8 what is the anser
Answer:
522
Explanation:
9 time 8 is 72, 7 carryover on 5 and 9 times 5 is 45 plus 7 carry over which is equal to 52. Therefore answer becomes 522.
How many grams of H2O are produced when 5.38g of O2 is reacted?
Answer:
2.33 g H20
Explanation:
12.1 grams of water are produced when 5.38g of O₂ is reacted.
What is Mole?The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Mass of oxygen = 5.38g
Moles = mass / molar mass
Moles of oxygen = 5.38 / 16
= 0.34 moles
From the reaction, 2H₂ + O₂ = 2 H₂O
1 mole of oxygen gives 2 moles of water.
Thus, 0.34 moles of oxygen will give 2 × 0.34 moles
= 0.67 moles of water.
Mass of water = moles × molar mass
= 0.67 × 18
= 12.1 g of water
Therefore, 12.1 grams of water are produced when 5.38g of O₂ is reacted.
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write the reaction for ferric hydroxide dissolving in NaOH. hint combine the two equilibrium reaction
The properly balanced chemical equation for this chemical reaction is written as follows:
[tex]FeCl_{3}(aq)+3Na0H(aq) \rightleftharpoons Fe(OH)_3(s)+3NaCl(aq)[/tex]
What is a chemical reaction?A chemical reaction can be defined as a chemical process that involves the continuous transformation (rearrangement) of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound while new bonds are formed.
The chemical reaction of aqueous ferric hydroxide that is dissolved in aqueous sodium hydroxide produces ferric hydroxide and aqueous sodium chloride. Thus, the properly balanced chemical equation for this chemical reaction is written as follows:
[tex]FeCl_{3}(aq)+3Na0H(aq) \rightleftharpoons Fe(OH)_3(s)+3NaCl(aq)[/tex]
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Video Worksheet
Cosmos S1E5 = Hiding in the Light
Answer:
ill try
Explanation:
7. The youngest part of the ocean floor is found ____.
a. along deep-sea trenches
b. where ocean sediments are thickest
c. near ocean ridges
d. where Earth’s magnetic field changes polarity
Answer:
The answer is Near The Ocean Ridges.
Fill in the blanks with its definition or description.
a. _________ The point in a titration when the added amount of standard reagent is equal to the amount of analyte being titrated.
b. _________The analyte is titrated with the standard reagent and the volume of standard solution required to complete the reaction is measured.
c. _________A reagent that is pure and stable, which can be used directly after weighing.
d. _________The analyte that is being analyzed in the titration.
e. _________Standard reagent is added in excess to ensure complete reaction with the analyte.
f. _________The excess reagent is then titrated with a second standard reagent.
g. _________A solution, whose concentration is known, often made from a reagent of known purity.
h. _________The standard reagent of known concentration that is added from a buret to the analyte solution.
i. _________The analyte does not react directly with the titrant so it is converted to another form which will react with the titrant.
j. _________The point in a titration when a change in the analyte solution is observed, indicating equivalency.
k. _________It is added to the analyte solution and aids in the observation of the completion of the reaction.
Answer:
a) equivalence point
b) direct titration
c) primary standard
d) titrand
e) Back titration
f) back titration
g) standard solution
h) standard solution
I) indirect titration
j) end point
Explanation:
A volumetric analysis is one in which a solution of unknown concentration is determined from its volume. This is commonly referred to as titration.
In titration, a standard solution is reacted with another solution of unknown concentration. The point at which the concentration of the standard solution is equal to that of the analyte is known as the equivalence point (usually indicated by a colour change). An indicator may be added to the analyte solution to help identify when the reaction is complete.
a particular graduated cylinder contains 24.0 mL Br2(liquid). The density of bromine at 25 degrees C is 3.12g/cm^3. Note that in nature, elemental bromine exists in diatomic form(that is, as Br2)
How many representative particles(molecules of Br2) are in the cylinder?
Answer:
[tex]2.82x10^{23}molecules[/tex]
Explanation:
Hello.
In this case, given the volume (1cm³=1mL) and density of the bromine we are to firstly compute the mass since it will allow us to compute the representative particles:
[tex]\rho =\frac{m}{V}[/tex]
[tex]m=\rho *V=3.12g/cm^3*24.0cm^3\\\\m=74.88gBr_2[/tex]
Next, since the mass of one mole of diatomic bromine is 159.82 g (one bromine weights 78.91), we can next compute the moles in that sample:
[tex]n=74.88g*\frac{1mol}{159.82g} =0.469molBr_2[/tex]
Finally, via the Avogadro's number we can compute the representative particles of bromine as follows:
[tex]particles=0.469mol*\frac{6.022x10^{23}molecules}{1mol}\\ \\2.82x10^{23}molecules[/tex]
Best regards.
Q. An ingestion tablet contains a mass of 0.30 g of hydroxide [Mg(OH)2] as its only basic ingre magnesium dient. The balanced chemical equation between magnesium and hydrochloric acid (HCl(aq)), the acid produced in the stomach is as follows:
Mg(OH)2(aq) + 2HCl(aq) ⟶ MgCl2(aq) + 2H2O(l)
(i) Calculate the volume of 1.00 M HCl neutralised by two of these ingestion tablets?
(ii) What mass of the salt is formed in this neutralisation reaction?
(iii) How many magnesium ions are present in this amount of a salt?
(i) The volume of 1.00 M HCl neutralized by two of these ingestion tablets is 20.6 mL
(ii) The mass of salt formed in the neutralization reaction is 0.98 g
(iii) The number of magnesium ions present in that amount of salt is 6.19 × 10²¹ ions
Stoichiometry(i) From the question, we are to calculate the volume of 1.00 M HCl neutralized two of the ingestion tablets
From the given balanced chemical equation
Mg(OH)₂(aq) + 2HCl(aq) ⟶ MgCl₂(aq) + 2H₂O(l)
This means,
1 mole of Mg(OH)₂ is neutralized by 2 moles of HCl to give 1 mole of MgCl₂
Now, we will determine the number of moles of Mg(OH)₂ present in two of the ingestion tablets
From the given information
Mass of Mg(OH)₂ in 1 ingestion tablet = 0.30 g
∴ Mass of Mg(OH)₂ in 2 ingestion tablets = 0.60 g
Using the formula,
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
Molar mass of Mg(OH)₂ = 58.33 g/mol
Then,
Number of moles of Mg(OH)₂ in 2 ingestion tablets = [tex]\frac{0.60}{58.33}[/tex]
Number of moles of Mg(OH)₂ in 2 ingestion tablets = 0.0102863 mole
Now,
If 1 mole of Mg(OH)₂ is neutralized by 2 moles of HCl
Then,
0.0102863 mole of Mg(OH)₂ will be neutralized by 0.0205726 moles of HCl
∴ The number of moles of HCl that would neutralize 2 ingestion tablets is 0.0205726 mole
Now, for the volume of 1.00 M HCl neutralized by two ingestion tablets
Using the formula,
[tex]Volume = \frac{Number\ of\ moles}{Concentration}[/tex]
Volume = [tex]\frac{0.0205726}{1.00}[/tex]
Volume = 0.0205726 L
Volume = 20.5726 mL
Volume ≅ 20.6 mL
Hence, the volume of 1.00 M HCl neutralized by two of these ingestion tablets is 20.6 mL
(ii) For the mass of salt (MgCl₂) formed in the neutralization reaction
Since 1 mole of Mg(OH)₂ is neutralized by 2 moles of HCl to give 1 mole of MgCl₂
Then,
0.0102863 mole of Mg(OH)₂ will be neutralized by 0.0205726 moles of HCl to give 0.0102863 mole of MgCl₂
∴ The number of moles of the salt (MgCl₂) formed is 0.0102863 mole
For the mass of the salt formed,
Using the formula,
Mass = Number of moles × Molar mass
Molar mass of MgCl₂ = 95.211 g/mol
∴ Mass = 0.0102863 × 95.211
Mass = 0.9793689 g
Mass ≅ 0.98 g
Hence, the mass of salt formed in the neutralization reaction is 0.98 g
(iii) For the number of magnesium ions present in that amount of salt,
1 mole of MgCl₂ contains 1 mole of magnesium ions
Then,
0.0102863 mole of MgCl₂ will contain 0.0102863 mole of magnesium ions
From the formula,
Number of ions = Number of moles × Avogadro's constant
Avogadro's constant = 6.022 × 10²³ mol⁻¹
∴ Number of magnesium ions present = 0.0102863 × 6.022 × 10²³
Number of magnesium ions present = 0.061944 × 10²³
Number of magnesium ions present = 6.1944 × 10²¹
Number of magnesium ions present ≅ 6.19 × 10²¹ ions
Hence, the number of magnesium ions present in that amount of salt is 6.19 × 10²¹ ions
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heat and light travel in
Answer:
Explanation:
All forms of energy that may move in waves, including as light, x-rays, radio signals, heat, and microwaves, are included in the electromagnetic spectrum. These waves all have an abundance of energy in them. Additionally, they can all fly through outer space.
Light energy is a type of electromagnetic energy, while heat energy is a type of kinetic energy made up of the random motion of a material's particles. This is the main distinction among light energy and heat energy. Despite the fact that light and heat are both forms of energy, both are not the same. All forms of energy that may move in waves, including as light, heat, x-rays, radio signals, ultraviolet waves, and microwaves, are included in the electromagnetic spectrum. These waves all have an abundance of energy in them. Additionally, they can all fly through outer space.
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How do this I’m in school really don’t know what to do
Answer:
you gotta rotate it 90 degrees and get that screen fixed
Explanation: