1. Using the periodic table and your knowledge of patterns and trends on the table, which of the following elements is the best conductor of electricity?
A. Titanium **
B. Silicon
C. Oxygen
D. Argon
2. Using the periodic table and your knowledge of patterns and trends on the table, which of the following elements is the most reactive?
A. Titanium **
B. Silicon
C. Oxygen
D. Argon
3. Using the periodic table and your knowledge of patterns and trends on the table, which of the following elements has the highest electronegativity?
A. Titanium
B. Silicon
C. Oxygen **
D. Argon
From the periodic table as well as the patterns and trends on the table, the correct option are:
the best conductor of electricity is Titanium; option Athe most reactive element is oxygen; option Cthe elements that has the highest electronegativity is oxygen; option CWhat is the periodic trends in the periodic table?Periodic trends in the periodic table refers to the variation in character which is observed in the periodic table as one moves across the periodic table from left to right across a period or down a group in the periodic table.
The periodic trend observed is that reactivity of metals increase down a group and from right to left across a period.
For non-metals, reactivity of non-metals increase from down to top in a group and from left to right across a period across a period.
Considering the given questions;
1. From the periodic table as well as the patterns and trends on the table, the best conductor of electricity is Titanium since it is the only metal in the list.
2. The most reactive element is oxygen because it is a non-metal found to the top-left of the periodic table.
3. The elements that has the highest electronegativity is oxygen because it is a non-metal found to the top-left of the periodic table.
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25.00 cm³ of 0.250 mol dm sodium hydroxide solution is neutralised by 25.0 cm³ of sulfuric acid. Calculate the concentration of the sulfuric acid in mol dm. H₂SO4(aq) + 2NaOH(aq) → Na₂SO4(aq) + 2H₂O(l)
concentration of sulfuric acid is 0.124mol/dm³
Given,
volume of sulfuric acid is 25 cm³
1 dm³ = 1000 cm3.
25.0 cm³ 0.250mol/dm3 NaOH solution contains (25/1000)×0.250 = 0.00625 mol NaOH.
2NaOH + H2SO4 → Na2SO4 + 2H2O
2 moles of NaOH neutralizes 1 mole of H2SO4.
Therefore, 0.00625 moles of NaOH neutralizes 0.00625/2 = 0.00312 moles of H2SO4.
So, the molarity of H2SO4 solution = (0.00312/25) × 1000 = 0.124 mol/dm³.
therefore concentration of sulfuric acid is 0.124 mol/dm³.
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A flammable gas made up of only carbon is found to effuse through a porous barrier in 1.50min. it takes an equal volume of bromine vapor 4.73min to effuse through the same barrier. Calculate the molar mass of the unknown gas and suggest what
the gas might be
Methane is the unidentified gas since its molar mass is 16 g/mol.
When describing atomic masses and molecular masses, the Dalton (Da) or unified atomic mass unit (u) are two alternative units of mass that are frequently employed. It is known to be 1/12 the mass of a carbon-12 atom and is also referred to as "amu" in older.
We must be aware that a gas's molar mass directly relates to how long it takes to diffuse.
t1/t2 = √M1/M2
Let t1 equal the 1.50 minutes it takes for the combustible gas to disseminate. Let t2 equal the 4.73 minutes it takes for the bromine vapor to disperse.
M1 = the flammable gas's molar mass equals
160 g/mol is the molar mass of the bromine vapor, or M2.
replacing values.
1.50/4.73 = √M1/160
(1.50/4.73) ^2 = M1/160
0.1006 = M1/160
M1 = 0.1006 × 160
M1 = 16 g/mol
Methane is the gas in question.
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HELP ASAP, NO LINKS!!
how do you write 4.13 x 103 in decimal notation?
Answer:
4130
Explanation:
When numbers are multiplied by the 10 raised to a positive power, you want to move the decimal place to the right that many places.
As such, since 4.13 is being multiplied by 10³, you want to move the decimal place to the right 3 places. Keep in mind that there are technically 0's to the right of the "3".
The number in decimal notation is 4130.
100 points!
A metal (M) forms a compound with the formula MCl4 . The compound contains 54.43% Cl by mass. Identify the metal in the compound? Give the symbol of the metal
Symbol is [Sn]
Atomie weight of cl is 35.45 Hence, in the compound MCl4, contribution of a atomic weight in 35.45 4 =141.8Now, the compound contains (100-54.43)
= 45.57% of metal by mass.
Now, 54.43% by mass is related to 141.8 atomic weight
hence, 45:57% by mass is related to
=1418 x 45.57/54.43 = 118.718 atomic weight
Atomic weight of Tin (sn) is 118.71
Hence, the metal is Tin, Symbol is [Sn]
The compound is SnCl4 (Stannic chloride)
A compound is a formula that occurs in a certain ratio of a specific formula, for as carbon dioxide, which is present everywhere but only in carbon 1 and oxygen 2.To know more about compound visit : https://brainly.com/question/14658388
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An element consists of _____ _____ of _____.
Answer:
Particles of The Same Composition
Given a 1 M stock of NaCl, how many mL of stock and how many mL of water you would mix to make 100 mL at 100 mM (0.1 M)??
1. The volume of the stock soluiton needed is 10 mL
2. The volume of water needed is 90 mL
Data obtained from the questionThe following data were obtained from the question:
Molarity of stock solution (M₁) = 1 MVolume of diluted solution (V₂) = 100 mL Molarity of diluted solution (M₂) = 0.1 M Volume of stock solution needed (V₁) =?Volume of stock solution needed (V₁) =?Volume of water needed =?1. How to determine the volume of the stock solution neededM₁V₁ = M₂V₂
1 × V₁ = 0.1 × 100
V₁ = 10 mL
Thus, the volume of the stock solution needed is 10 mL
2. How to determine the volume of water Volume of stock solution (V₁) = 10 mL Volume of diluted solution (V₂) = 100 mL Volume of water =?Volume of water = V₂ – V₁
Volume of water = 100 – 10
Volume of water = 90 mL
Thus, the volume of water needed is 90 mL
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If 6.000 g of sugar is mixed with 9.000 g of water, what is the
concentration in weight percent?
The concentration in weight percent is 40%
Data obtained from the questionThe following data were obtained from the question:
Mass of sugar = 6.000 gMass of water = 9.000 gTotal mass = 6.000 + 9.000 = 15.000Concentration in weight percent = ?How to determine the concentration in weight percentConcentration in weight percent = (mass of sugar / total mass) × 100
Concentration in weight percent = (6.000 / 15.000) × 100
Concentration in weight percent = 0.4 × 100
Concentration in weight percent = 40%
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Chemical elements that do not exist in nature but can be created in the laboratory are known as synthetic elements. Flerovium, a synthetic element with atomic number 114, was first synthesized in 1998. A hypothetical mass spectrum for a sample of Fl, containing 10 atoms is shown below.
Using the information in the spectrum, calculate the average atomic mass of Fl in the sample in u.
Write your answer using four significant figures.
The relative atomic mass is 288.60
What is the atomic mass?The relative atomic mass is the sum of the products of the masses of the percentage abundance of each of the isotopes and the mass of that isotope. Recall that an element is composed of isotopes. These isotopes have the same atomic number but different mass numbers.
This implies that the isotopes have different numbers of neutrons. Let us now obtain the relative atomic mass of the element Flerovium.
Percentage abundance of isotope 1 = 2/10 * 100/1 = 20%
Percentage abundance of isotope 2 = 2/10 * 100/1 = 20%
Percentage abundance of isotope 3 = 6/10 * 100/1 = 60%
Then;
(0.2 * 287.2) + (0.2 * 288.2) + (0.6 * 289.2)
= 57.44 + 57.64 + 173.52
= 288.60
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How much more mass does an alpha particle have compared to an electron?
Which element being oxidized in the following redox reaction 2 KCI3(g) = 2 KCI(g) + 3 O2(g)
Oxygen get oxidized in the following redox reaction 2KCIO₃(g) = 2 KCI(g) + 3O₂(g).
Redox is a kind of chemical response wherein the oxidation states of substrate exchange. Oxidation is the lack of electrons or growth inside the oxidation nation of a chemical or atoms inside it.
An oxidation-reduction reaction is a type of chemical reaction that includes a switch of electrons among two species. An oxidation-reduction response is any chemical response wherein the oxidation number of a molecule, atom, or ion modifications through gaining or dropping an electron.
The time period oxidation turned into used to explain reactions wherein a detail combines with oxygen. for instance, the oxidation of magnesium includes the chemical reaction between magnesium metal and oxygen to shape magnesium oxide.
Left hand side: K = +1; O = -2; Cl = +5
Right hand side: K = +1; Cl = -1; O = 0
here, the oxidation state of O changes from -2 to 0.
Therefore, the oxygen gets oxidized.
Disclaimer:- your question is incomplete, please see below for the complete question.
Which element is oxidized in the following redox reaction?
2KCIO₃(g) = 2 KCI(g) + 3O₂(g)
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Why is it important to distinguish science from pseudoscience?
It is fundamental to distinguish science from pseudoscience because science can help us to understand questions from the real world.
What is science?The term 'science' makes reference to all the body of knowledge obtained by using the scientific method, which is based on collecting empirical evidence that helps to test hypotheses or explanations (either confirm or reject them), that emerged by observing the real world.
Conversely, pseudoscience is not a discipline because it is not based on scientific evidence and therefore this type of data cannot be tested or verified, which is fundamental to progress in our understanding of the tangible characteristics of the real world.
In conclusion, it is important to distinguish science from pseudoscience because science can help us to understand questions from the real world and solve problems associated with our health and the environment.
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Which of the following protects Earth's atmosphere from solar wind
a. radiative zone
b. hydrogen atoms
c. convection currents
d. magnetosphere
The magnetosphere protects the earth's atmosphere from the solar wind.
Hence, option (d) is correct.
The magnetosphere is the area of spcae, around the earth which is controlled by the magnetic field of the earth.
The magnetosphere is created because of the earth's own magnetic field which is generated from the outer core.
The magnetosphere is made up of plasma having charged particles, mainly electrons and protons,
The magnetosphere stretches from the earth's core out into space. Here it meets solar winds or solar radiation emitted by the sun. The magnetosphere is acting as a shield and protects the earth from harmful solar radiation.
Hence, the magnetosphere protects the earth's atmosphere from the solar wind.
Therefore, option (d) is correct.
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Answer: The answer is magnetosphere
Explanation:
You will get it right.
How are you going to apply your learning in naming compounds in our daily lives?
Answer:
Compounds in our daily life are salt, water, baking soda, sugar, graphite, etc.
Explanation:
We can use the knowledge of compounds to recognise different compounds such as listed above. We can realise what they're made up of and why they are compounds.
Why are carbon atoms the building blocks for life?
their bonds are easily broken and repaired.
they have a negative charge to attract other atoms.
they can freely bond with any other atom.
thier bonds woth hydrogen are very stable.
Answer:
C: They can freely bond with any other atom.
Explanation:
It is said that Because each carbon is identical, they all have four valence electrons, so they can easily bond with other carbon atoms to form long chains or rings
A mixture weighing 6.200 grams is 28.0% silicon dioxide or sand (SiO2), 36.0% sodium chloride (NaCl), and the rest being sodium bicarbonate, NaHCO3. How many grams of baking soda are present in the sample?
The mass of baking soda, NaHCO₃ present in the sample is 2.232 g
What is the percentage mass of a substance?The percentage mass of a substance is the ratio of the mass of a substance a given mixture or compound to that of the total mass of the compound or mixture expressed as a percentage.
Percentage mass = mass of substance/ mass of mixture or compound * 100%The percentage mass of baking soda, NaHCO₃ = 100 - ( 28 + 36)%
The percentage mass of baking soda, NaHCO₃ = 36%
mass of baking soda, NaHCO₃ = 36/100 * 6.200
mass of baking soda, NaHCO₃ = 2.232 g
In conclusion, the mass of baking soda, NaHCO₃ is obtained from the total mass of the mixture and the percentage mass of baking soda in the mixture.
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What determines the trend in ionization energy as you move DOWN a column on the periodic table.
Elements have a larger radius, electrons are pulled tightly, and have a higher ionization energy.
Elements have a smaller radius, electrons are pulled tightly, and have a higher ionization energy.
Elements have more energy levels, cannot pull in the electrons tightly, and have a lower ionization energy.
Elements have fewer energy levels, pull in the electrons weakly, and have lower ionization energy.
Elements have more energy levels, pull in the electrons tightly, and have a lower ionization energy.
Elements have fewer energy levels, pull the electrons tightly, and have a higher ionization energy.
Answer:
Elements have more energy levels, cannot pull in the electrons tightly, and have a lower ionization energy.
Explanation:
Which option represents a group of elements with the same properties? (100 points for brainliest!!)
A.) neon, sodium, magnesiu
B.) calcium, potassium, scandium
C.) fluorine, bromine, chlorine
D.) arsenic, mercury, xenon
Fluorine,chlorine and bromine are elements with same properties.
What are the periodic trends in the periodic table?Properties such as the physical or chemical properties differ significantly across a period in a periodic table as electrons are added to the same valence shell.
Hence, for each successive element in a period there is one more electron in it's valence shell than the preceding element,as a result of which physical properties such as melting and boiling point differ significantly.
But for elements present in a group,as all elements in a group have same number of valence electrons ,hence they have same properties.
Among all the groups given,the group comprising of fluorine,chlorine and bromine have the same properties as they belong to the same group and have same number of valence electrons.
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An experiment is repeated five times resulting in five replicate data points. The average deviation of the replicate data point is a measure of:
a Precision
b Accuracy
What is an dependent variable? what a scientist changes in an experiment to test their hypothesis what a scientist changes in an experiment to test their hypothesis what happens when you do an experiment what happens when you do an experiment What you keep the same throughout all experimental groups What you keep the same throughout all experimental groups What scientist measure to see if it responded to a change What scientist measure to see if it responded to a change
Answer:
what a scientist changes in an experiment to
Explanation:
scientist measure to see if it responded to a change
Which groups highlight nonmetals?
O A and B
O A and C
OB and D
OC and D
Answer:
1.) A and B
Explanation:
Elements in group A are nonmetals. Specifically, these elements are called noble gases.
Elements in group B are nonmetals.
Elements in group C are metalloids.
Elements in group D are metals.
If 0.1375 moles of a something weighs 58.61 g, what is the molar mass of it, in units of g/mol?
Answer:
0.1375 mol of it has a mass of 58.61 g.
One mole of it will have a mass of
0.1375 divide by 58.61
=0.00234601604g (molar mass of compound).
Solve the following problems.
7. If a graduated cylinder has 22 ml of water, and 6.4 ml are added, what is the total
volume of water in the cylinder?
The total volume of the cylinder is 28.4 ml.
Volume is a measurement of three-dimensional space that is occupied. Numerous imperial units or SI-derived units, such as the cubic metre and litre, are frequently used to quantify it numerically (such as the gallon, quart, and cubic inch).
Volume and length (cubed) have a symbiotic relationship. The volume of a container is typically thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the amount of fluid (liquid or gas) that the container may hold. the following volume units:
• Metric units include litres, cubic centimetres, and cubic metres.
• US Standard: ounces, inches, feet, pints, and gallons
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In the 1800s two scientists, Theodor Schwann and Matthias Schleidern, studied different types of organisms. After many years of studying a great variety of organismns, they drew similar but independent conclusions about their observations. F Schwann studied animal and concuded that all animals are made of cells. What statement was developed most directly from these conclusions and is part of the modern cell theory? Schleiden studied plants and concluded that all plants are made of cells. The functions of living things occur in cells. G Cells exist only in mnulticellular organisms. H Living things are composed of cells. J Cells contain hereditary information.whats the answer?
Complex cells exist only in multicellular organisms and all living things are composed of cells and DNA contain hereditary information
Multicellular organisms are made of more than one cell and are complex organisms and they possess distinct organs and organ systems and they are eukaryotes means they contain membrane-bound structures and modern cell theory that cells are the basic structural, functional, and organizational units of both single-celled and multicellular organisms and cells divide and pass on hereditary information and energy flows within cells here g is the complex cell only exist only in multicellular organisms and h is the all the living things are composed of cells and j means DNA cells contain hereditary information and DNA is responsible for genetic information
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How much water is in this cylinder?
Answer:~13mL
Explanation:
You have to read from the around the middle of the meniscus (which is the curve in the liquid's surface)
Write an equation for the reaction of ammoniacal silver nitrate with phenylethyne. What is the role of ammonia in the reaction?
Equation for the Reaction is C2H2+2AgNO3+2NH4OH→C2Ag2+2NH4NO2+2H2O
Phenylethyne is a type of acetylene. Phenylethyne reacts with ammoniacal AgNO3 and the reaction is known as Tollens’s Test. In the following Tollens test, we get a white precipitate. A white precipitate known as silver acetylene (C2Ag2) is produced.We know that the Tollens reagent can be used to determine whether an aldehyde or ketone functional group is present. We are aware that the Tollens reagent is made up of a silver nitrate, ammonia, and sodium hydroxide solution.A triple bond makes up acetylene, and as silver acetylide also has a triple bond in its structure, the reaction with ammoniacal AgNO3 will result in silver acetylide. Role of ammonia is that it forms silver oxide, but with the addition of more ammonia, this solid precipitate will dissolve and yield a transparent solution of the diamminesilver(I) complex ([Ag(NH3)2]+).Learn more about tollen's test here:
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A student is working on creating an experiment. Based on the chart they have started filling out, what section are they on? A. Hazard identification B. Risk Assessment C. Materials and Methods D. Procedure
In a case whereby a student is working on creating an experiment. Based on the chart they have started filling out, B. Risk Assessment .
What is Risk Assessment?Risk assessment can be describe as the overall process or method where the risk is been identified.
It should be noted that this does not only Identify hazards but also look into the risk factors which could bring about potential to cause harm in the process known as the hazard identification.
Therefore, from the case above we can see that there is Analyses and evaluation of the risk associated .
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Melting and boiling point of peppermint essential oil
Answer: Melting Point : 42 to 43 °C
Boiling Point : 215 to 216 °C
When 5.6g of iron reacts with sulfur, the mass of iron sulfide is 8.8g. What mass of sulfur reacted?
Fe + S -> FeS
.If the reaction of 125 g of C6H6O3 reacts in excess of oxygen (O2) and produces 51
g of H2O.
C6H6O3 + 3O2 → 6CO + 3H2O
a) How many grams of the excess reactant left over?
b) What is the percent yield?
If the reaction of 125 g of C₆H₆O₃ reacts in excess of oxygen (O₂) and produces 51. The calculations for the following are:
a. 51 grams.
b. 95.20 %
What is the percent yield?Percent yield is the calculation of the difference between actual and estimated yields.
C₆H₆O₃ + 3O₂ -------> 6CO + 3H₂O
Molar mass of C₆H₆O₃
6 x 12 + 6 x 1 + 3 x 16 = 72 + 6 + 48 = 126 g per mole.
So, 125 grams is 125 / 1 26 moles = 0.992 moles of C6H6O3.
From the equation, we can see that 1 part of C₆H₆O₃ reacts with 3 parts of Oxygen gas to give 6 parts of Carbon Monoxide and 3 parts of water.
So, 1 part = 0.992 moles
Hence, 3 parts of water is 0.992 x 3 = 2.976 moles of H2O.
Molar mass of H2O = 2 x 1 + 1 x 16 = 18 grams per mole.
So, 2.976 moles of H2O has a mass of 2.976 x 18 = 53.568 grams
So, the mass of water that should have been formed = 53.568 g
Thus, the grams of the excess reactant left over is 51 grams.
Percentage yield = (51 / 53.568) x 100 is 95.20 % (approx.)
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Answer:
If the reaction of 125g C6H6O3 REACTS in excess of O2and produced 51g of H2O what is the % yeild
Explanation:
