(HELPP)
2. Describe at least three properties of elements in groups 1, 17, and 18.
Answers
Group 1 in periodic table is called alkali metals which are metals containing sodium, potassium, lithium etc. Elements of 17th group are halogens and elements of 18th group are noble gases.
What are group in periodic table?
Groups in periodic table are vertical columns containing elements of same number of valence electrons and similar chemical and physical properties.
Group 1 is alkali metals with one valence electron containing the elements sodium, potassium, lithium and cesium and francium. They are metals with high thermal and electrical conductivity.
Group 17 are halogens containing highly electronegative elements chlorine, fluorine, bromine, iodine and acetatin. They are non-metals with high reactivity. Halogens have high ionization energy.
Group 18 is noble gases, helium, argon, neon, krypton, xenon and radon all are non metals with highly stable electronic configuration. They are inert at normal conditions and thus they are called inert gases. They rarely form compounds.
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Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.
Elements that belongs to group 1 are metals. Group 1 elements have valency 1. Elements that belong to group 17 are called halogens and has high electronegativity. Elements belonging to group 18 are noble gases, they are not at all reactive.
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Related Questions
A 45.0 cm3 sample of gas is heated from 280. K to 315 K. What is the new volume of the gas sample?
Answers
Answer:
50.63 cm³
Explanation:
Using Charles law equation as follows:
V1/T1 = V2/T2
Where;
V1 = initial volume (cm³)
V2 = final volume (cm³)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the question, V1 = 45.0 cm³, V2 = ?, T1 = 280 K, T2 = 315 K
Using; V1/T1 = V2/T2
45/280 = V2/315
Cross multiply
45 × 315 = 280 × V2
14175 = 280V2
V2 = 14175 ÷ 280
V2 = 50.625
V2 = 50.63 cm³
Question
A watershed is the area of land where all of the water drains off and eventually combines at a central point. As water runs off it picks up different types of surface pollution leftover from agricultural, industrial, commercial, and other types of human activity. Why does the pollution in a watershed have such a heavy impact on its inhabitants?
Responses
A the water combines and the pollutants become more concentratedthe water combines and the pollutants become more concentrated
B the water combines and the pollutants become less concentratedthe water combines and the pollutants become less concentrated
C the species that inhabit the watershed must have the pollution in order to survivethe species that inhabit the watershed must have the pollution in order to survive
D pollution does not affect the inhabitants of a watershed
Answers
The pollution in a watershed have such a heavy impact on its inhabitants because the water combines and the pollutants become more concentrated.
What is pollution?Pollution is defined as the introduction of harmful material to the environment. These harmful material is called pollutant.
Pollutant can be natural such as volcanic ash. They can also be created by human effect.
There are four types of pollution
Water pollutionLand pollutionAir pollution Soil pollutionThus, the pollution in a watershed have such a heavy impact on its inhabitants because the water combines and the pollutants become more concentrated.
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What is the standard notation for 7.934 x 10-4 ?
Answers
Answer:
It is
Explanation:
75.34 Im hopeing this correct.Very sorry if wrong.
Sodium azide nan3 is dissolved in water. Acidified silver nitrate is added to the solution and a white precipitate forms. Aqueous ammonia is then added to the solution and a white precipitate forms. Aqueous ammonia is then added to the white precipitate. The azide ion n3- has similar chemical properties to the cl- ion. What is the formula of the ppt formed and what is the observation on adding aqueous ammonia?
Answers
Answer:
The formula of the precipitate formed is AgN₃ (Silver azide).
On adding aqueous ammonia to the precipitate formed, the precipitate dissolves due to the formation of a soluble complex compound with aqueous ammonia.
Explanation:
Sodium azide is NaN₃
Silver Nitrate is AgNO₃
The two of them react and theres a double displacement where the ions exchange radicals.
NaN₃(aq) + AgNO₃(aq) → NaNO₃(aq) + AgN₃(s)
The azide ion (N₃⁻), which has very similar chemical properties as the chloride ion (Cl⁻), also forms an insoluble compound with Silver.
And just like AgCl, the precipitate (AgN₃) also dissolves when ammonia is added by forming a soluble complex.
AgN₃(s) + 2NH₃(aq) → [Ag(NH₃)₂]N₃(aq)
Hope this Helps!!!
Please help, only a couple of days left!!!
Answers
Answer:
the heat from the universe during the big bang
a.k.a.
ITS A
Explanation:
the universe is still expanding, so what is gonna be used to create that new matter that's expanding the universe? energy and heat from the beginning of the universe! the universe started off as this point that was probably smaller than a quantum foam and infinite heat and started expanding from there
In the following equation, ______ is being oxidized and ______ is being reduced.
CO3 2- + 2H+ → CO2 + H2O
A. None of these
B. carbon, oxygen
C. carbon, hydrogen
D. hydrogen, carbon
Answers
\(oxidation \: number \: of \: oxygen = \\ before \: rxn = - 2 \\ after \: rxn = - 2\)
\(oxidation \: number \: of \: hydrogen = \\ before \: rxn = + 1 \\ after \: rxn = \\ 2x - 2 = 0 \\ x = + 1\)
\(oxidation \: number \: of \: carbon = \\ before \: rxn = \\ x - 6 = - 2 \\ x = 4 \\ after \: rxn = \\ x - 4 = 0 \\ x = 4\)
Option A\(oxidation \: numbers \: remain \: constant \\ so \: none \:a re \: undergoing \: oxidation \: \\ nor \: reduction \: \)
Answer:
D
Explanation:
I believe that is the answer
Which of the following reactions shows that the formation of CO2 releases
393.5 kJ/mol?
A. C(s) + O2(g) → CO2(g) + 393.5 kJ
O B. C(s) + 20(g) + 393.5 kJ → CO2(9)
O C. C(s) + O(g) + CO2(g) + 393.5 kJ
D. C(s) + O2(g) + 393.5 kJ → CO2(g)
Answers
Answer:
A. C(s) + O2(g) → CO2(g) + 393.5 kJ
Explanation:
The formation of carbon IV oxide (CO2) is an exothermic process. n exothermic process is a chemical process in which heat is evolved. Speaking in lay man's terminology, heat is one of the 'products' of the reaction. This implies that heat is evolved by the process.
The formation of CO2 is always a combustion reaction where heat is evolved or released by the reaction system. Hence the reaction could be shown as;
C(s) + O2(g) → CO2(g) + 393.5 kJ
This implies that 393.5 kJ of energy is released in the reaction in the form of heat. Hence the answer given in the answer box.
Answer: C(s) + O2(g) → CO2(g) + 393.5 kJ
What 2 elements on the Periodic Table may be produced sad reactions?
Answers
Answer: The two elements on the periodic table that may be produced in sad reactions are Oxygen and Nitrogen.
Explanation:
Both of these elements are part of the air we breathe and are required for survival, but under certain conditions, they can lead to sad reactions. Oxygen is required for respiration, but when it reacts with other substances in the body, it can lead to the production of free radicals, which can damage cells and cause mood disorders. Nitrogen is also required by the body, but when it reacts with oxygen and other substances in the air, it can lead to the formation of air pollutants, such as smog and ozone, which can also contribute to sad reactions.
07.
Name ONE piece of apparatus used in each of the following separation techniques?
Filtration:..
Evaporation. Evaporating.disn
Sublimation;.
Distillation; Dustallation flash
Decantation:......
Crystallization;
Chromatography:.
Answers
Filtration is a separation method used to separate out pure substances in mixtures comprised of particles some of which are large enough in size to be captured with a porous material. Particle size can vary considerably, given the type of mixture.
Evaporation is a technique used to separate out homogeneous mixtures that contain one or more dissolved salts. This process drives liquid components out of solid components. This process usually heats the mixture until the liquid is gone.
Distillation is an effective method of separating mixtures of two or more pure liquids. Distillation is a purification process that vaporizes, condenses, and separates the components of a liquid mixture.
Chromatography is the separation of a mixture by passing it in solution or suspension, or as a vapor through a medium in which the components move at different rates. Thin-layer chromatography is a special type of chromatography used for separating and identifying mixtures that are or can be colored especially pigments.
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Place the following items in the correct order to show how a voice can be recorded and saved using an analog device.
Answers
Answer:
A person sings into a microphone.
Sound is converted to an electrical signal
The electric signal creates a magnetic code.
A magnetic code is transferred to a medium such as a tape or ...
In lab, you may need to evaluate the odor or smell of a chemical. What is the best way to smell a chemical sample?.
Answers
Given what we know about lab safety, we can confirm that the best way to smell a chemical sample when needed, is to place the sample under your nose at a safe distance and smell very slowly.
Why is this the best way to smell the sample?Many chemicals can at times emit relatively toxic fumes. These fumes can be very dangerous to inhale. Therefore, it is best to take safety precautions when attempting to smell a sample. Placing the sample at a distance and smelling slowly is a good habit as it gives you time to react to an unpleasant or potentially dangerous smell.
Therefore, we can confirm that since many chemicals in a lab can be dangerous and can often have relatively toxic fumes, extreme care should be taken if attempting to smell them. Placing the sample at a safe distance and smelling slowly is a good safety precaution to take.
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HHHEEEEELLLPPP MMMEEE
Travis is warming up before basketball practice. Which of these activities would provide the best dynamic stretch to prepare him for sprinting?
Forward bends
Arm rotations
Neck extensions
Leg swings
Answers
Answer:
Leg swings sounds good but not to sure
Explanation:
I mean in order to play basketball gotta warm up your legs
Answer: Leg swings
Explanation: Leg swings would be best for preparing to sprint because you will have to move you legs very quickly, and leg swings would be a good warm up without tiring yourself out.
write the formula for a complex formed between zn2 and oh− with a coordination number of 4.
Write the formula for a complex formed between Zn2 and OH
Answers
The formula for the complex formed between Zn2+ and OH− with a coordination number of 4 is [Zn(OH)4]2−.
When Zn2+ ions combine with four OH− ions, a complex ion is formed. The coordination number of this complex ion is 4, meaning that the Zn2+ ion is surrounded by four OH− ions in a tetrahedral arrangement. The formula for this complex ion is written by placing the Zn2+ ion in the center and surrounding it with four OH− ions. The charge on the complex ion must be balanced, so two negative charges are needed. This is accomplished by adding a 2− superscript to the formula.
In coordination chemistry, a complex ion is formed when a central metal ion or atom is surrounded by other ions or molecules, known as ligands. The coordination number is the number of ligands that are attached to the central metal ion. In the case of Zn2+ and OH−, when four OH− ions surround the Zn2+ ion, a coordination number of 4 is obtained.
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which two events would be likely effects of replacing a forested area with an urban area
Answers
Answer:
More air pollution because there are fewer trees to take in carbon dioxide
Fewer birds and other wildlife because they have fewer places to live
Explanation:
I took the test on APEX
Equimolar amounts of Cl2(g) and CO(g) are injected into an evacuated, rigid container, where they react according to the equation below. Cl2(g)+CO(g)⇄COCl2(g) ΔHrxn=−109kJ/molrxn (a) If 7.0 g of CO(g) is consumed in the reaction with excess Cl2(g), how many moles of COCl2(g) are produced? (b) Which element is oxidized in this reaction? Justify your answer in terms of oxidation numbers.
Answers
Answer:
0.25 moles of COCl₂ are been produced
The element that is oxidized is C, it changed the oxidation state from +2 in CO to +4 in phosgene.
Explanation:
Equilibrium reaction:
Cl₂(g) + CO(g) ⇄ COCl₂(g)
Let's convert the mass of CO to moles:
7g . 1mol /28g = 0.25 moles
As ratio is 1:1, we can say that 0.25 moles of COCl₂ are been produced.
1 mol of chlorine reacts to 1 mol of carbon monoxide in order to produce 1 mol of phosgene.
Chlorine is been reduced:
Cl₂ + 2e⁻ ⇄ 2Cl⁻
Change the oxidation state, from 0 (ground state) to -1. Oxidation state decreased.
Carbon is been oxidized.
In CO, carbon has +2 as oxidation state. In phosgene the oxidation state is +4. This oxidation state was increased, that's why it has oxidized.
The element that is oxidized is carbon whose oxidation number was increased from +2 to +4.
The equation of the reaction is;
Cl2(g) + CO(g) ⇄ COCl2(g)
We have been told that the chlorine gas is the reactant in excess hence the carbon monoxide is the limiting reactant.
Number of moles of CO = 7.0 g/28 g/mol = 0.25 moles
Since the reaction is 1:1, 0.25 moles of COCl2 is produced.
The element that is oxidized is carbon whose oxidation number was increased from +2 to +4.
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Na3(PO4) + HCl yields NaCl + H3(PO4)
Answers
Chemical Equation Balancer
Do you think it’s important that forensics is categorized as a science? Why or why not?
Answers
Which organism obtains energy without depending on another organism
Answers
Answer:
Plants
Explanation:
2. carbon (c) and hydrogen (h) what type of bond will form between these two elements? why?
Answers
The type of bond that will form between carbon and hydrogen is covalent bond.
What is covalent bond?Covalent bond is a type of chemical bond where two atoms are connected to each other by the sharing of two or more electrons.
In chemistry, the carbon-hydrogen bond (C−H bond) is a chemical bond between carbon and hydrogen atoms that can be found in many organic compounds. This bond is a covalent, single bond.
It can be formed because carbon shares its outer valence electrons with up to four hydrogen atoms.
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Can someone help me with number 4? Please and thank you
Answers
Answer:
1st Blank: 1 Co
2nd Blank: 2 Na2S
3rd Blank: 4 Na
4th Blank: 1 CoS2
Explanation:
Trust me
In this lab you will construct several electrochemical cells where both half-cells contain a copper electrode in a copper (II) solution. What standard cell potential (Eºcell would be expected for a voltaic cell comprised only of copper? O 0.68 V O 0.34 V 0 0.0592 V O 0.00 V 0 -0.34 V
Answers
In the lab, electrochemical cells are being constructed with copper electrodes in copper (II) solution for both half-cells. The expected standard cell potential (Eºcell) for a voltaic cell consisting solely of copper is 0.00 V.
The standard cell potential, denoted as Eºcell, represents the potential difference between the two half-cells of an electrochemical cell. It is a measure of the cell's ability to generate an electric current. In this case, since both half-cells contain copper electrodes in copper (II) solution, there is no difference in the reduction potential of the two half-reactions. This results in an equal and opposite potential, leading to a net cell potential of zero. This implies that no spontaneous redox reaction occurs and no electrical energy is generated or consumed within the cell.
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really need help with this
Answers
This is a microscope.
Hope this clears that up for you.
Concentration (M)
Reaction: G F
What does the
graph tell us about
this reaction at
equilibrium?
Time (sec)
A. The reaction is reactant favored (K<1).
B. The reaction is product favored (K>1).
C. The reaction has equal concentrations of reactants
and products.
Answers
Answer:
i think its a if not sorry i have it in a test right now
Explanation:
Which statement compares the relative strength of the electric forces that hold particles together
A. The force between two nonpolar molecules are stronger than the force between positive ions and freely moving electrons
B. The force between two polar molecules are stronger than the force between positive ions and freely moving electrons
C. The force between positive and negative ions is weaker than the force between two polar molecules
D. The force between two nonpolar molecules is weaker than the force between positive ions and freely moving electrons
Answers
A.the force between two non polar molecules are stronger than the force between positive ions and freely moving electrons
According to Le Chatelier' principle, if a ytem in dynamic equilibrium contain a large exce of reactant, what can be done to encourage the formation of more product?
Answers
According to Le Chatelier' principle, if a ytem in dynamic equilibrium contain a large excess of reactant, to encourage the formation of more product we can remove product from the system as it is formed.
A system in dynamic equilibrium will respond to a stress (change in conditions) in a way intended to reduce that stress. This is the guiding idea of Le Chatelier.
We want to influence the system's response so that it produces more product. A reduction in product results from adding stress to the system by removing some of the product. The system's response is to move the equilibrium to the right to boost product production in order to reduce the stress.
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Scientists are studying a graph showing the time differences between the seismic
P-waves and the seismic S-waves as they travel through Earth. Which information
can they learn from the graph
Answers
Answer:
The information that they will learn from the graph is how fast the waves will move and which one has the fastest velocity. What they will notice ia that the P wave will be moving faster and arrive first.
what atoms are present In the molecule KNO3 and how many are there of each ?
Answers
Answer:
one potassium, one nitrogen and three oxygen
Explanation:
potassium is K, nitrogen is N and oxygen is O
Gamma rays are often used to kill microorganisms in food, in an attempt to make the food safer. Some people contend that this irradiated
food is actually less safe to eat. Which, if true, would most effectively dispute their idea? (1 point)
a
Irradiated food only emits alpha particles, which are harmless.
Ob
Irradiated food is shown to not be radioactive.
C
Irradiated food only contributes to background radiation.
Irradiated food has molecules that undergo transmutation,
Od
Answers
Answer:
b . Irradiated food is shown to not be radioactive.
Explanation:
If it can be proven that irradiated food is not radioactive, then it will effective dispute the idea that irradiated food are less safe to eat.
An irradiated food is one in which ionizing radiations have been employed to improve food quality. Thus, bacteria and other food spoilers can be exterminated from the food. Most irradiated food do not contain radiation and are fit for consumption.If it can be proven, that this is true, then it will challenge the idea that irradiated foods are not safe.
What is the chemical formula for Mercury (I) Phosphate and how to get it
Answers
Hg3PO4
Best way of trying to explain this is to find the valency, cross and cancel.
Mercury Symbol is Hg Valency 1 from Roman Numeral in Bracket.
Phosphate is a complex ion symbol PO4 with valency 3.
Cross over the valencies and cancel the 1 to get Hg3PO4.
the pka of lactic acid is 3.86. what is the ph of a buffer in which the lactic acid and sodium lactate have equimolar concentration?
Answers
The pH of the buffer in which the lactic acid and sodium lactate have equimolar concentration is equal to the pKa of lactic acid, which is 3.86.
How to solve for the pHThe acid dissociation constant for lactic acid is given as pKa = 3.86, so Ka can be calculated as:
Ka = 10^(-pKa) = 10^(-3.86) = 1.87 x 10^(-4)
Substituting these values into the Henderson-Hasselbalch equation, we get:
pH = pKa + log([base]/[acid])
pH = 3.86 + log(x/x)
pH = 3.86
Therefore, the pH of the buffer in which the lactic acid and sodium lactate have equimolar concentration is equal to the pKa of lactic acid, which is 3.86.
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