Answer:
Potassium < lithium < Selenium < Oxygen
Explanation:
Oxygen has the highest electronegativity value from the given choices.
Electronegativity of an element is a property that combines the ability of its atom to lose and gain electrons.
It is a measure of the relative tendency with which atoms of the element attracts valence electrons in a chemical bond.
Down a group, electronegativity reduces and across the period from left to right, it increasesPotassium and lithium are in group 1 , selenium and oxygen are group 7;
So group 1 elements will have lower electronegativity value.
Potassium is below lithium in group 1 and its electronegativity value will be lower.
Selenium is below oxygen and also, its electronegativity value is lesser.
The electronegativity values of lithium, oxygen, potassium, and selenium from lowest to highest is potassium, lithium, selenium and oxygen.
The electronegativity of an element is a measure of the tendency of an atom of element to attract bonding pair of electrons. Electronegative elements have the ability to attract shared electrons of covalent bonds to itself.
The most electronegative element is fluorine. Electronegativity increases across the period in the periodic table .
Electronegativity decreases down the group in the periodic table. Generally metallic elements are have lower electronegativity. This is because they mostly give out there electrons.
Therefore, the electronegativity values of lithium, oxygen, potassium, and selenium from lowest to highest is potassium, lithium, selenium and oxygen.
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Select the correct answer.
What is the heat content, q, of the reaction when glucose burns?
OA. q=0
OB. q> 0
O C. q<0
OD. 920
Answer: C. q < 0
Explanation: sorry if I'm wrong
10 points Which of these is the best example of heat transfer by radiation? *
1 point
a) A satellite is warmed by sunlight.
b) A ceiling fan cools a warm room.
c) Butter melts on warm bread.
d) Puddles of water cool a warm tile floor.
Answer:
a) A satellite is warmed by sunlight.
Explanation:
Heat transfer by radiation mostly involves heat gain or heat loss from the Sun. In this case, Option A is the only option where sunlight is involved so it is the best example of heat transfer by radiation.
which is least likely to be reduced?
A. Zn^2+
B. Fe^3+
C. Cu^2+
D. Fe^2+
A. Zn²⁺
Further explanationGiven
Cations of several elements
Required
The least to be reduced
Solution
If we look at the voltaic series:
Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe²⁺-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Fe³⁺-Ag-Pt-Au
The electrode which is easier to reduce than the hydrogen (H2) electrode has a positive sign (E red= +) and is located to the right of the voltaic series (right of H)
The electrode which is easier to oxidize than the hydrogen (H2) electrode and is difficult to experience reduction has a negative sign (E red= -) and is located to the left of the voltaic series (left of H)
Or you can look at the standard reduction potential value of the metals in the answer options, and the most negative reduction E° value which will be difficult to reduce.
The Zn metal is located far left of the other metals in the answer choices, so it is the most difficult to reduce
if you wanted to look at a cell wall which type of cell would you observe
Answer:
You could observe the cell wall in all kingdoms except for the animals. That would be cells of plants, protists (algae), fungi, bacteria and achaea.
uses of hydrogen?.......
Explanation:
Uses of hydrogen :
It can be used as rocket fuel. It can be used for welding It can be used for the production of hydrochloric acid.It can also be used to generate electricity.Hope it Helps.
Help with this question
Answer:
So the number of protons equals the number of electrons.
Explanation:
Ionic bond, also called an electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.
Which generally describes granite?
A. Dark colored rock with low silica content
B. Dark colored rock with high silica content
C. Light colored rock with low silica content
D. Light colored rock with high silica content
Answer:
I THINK IT MIGHT BE B
Explanation:
What is the problem with O2?
Answer:
It’s one of the most popular mobile networks across the UK, but it seems that O2 is having issues this morning
explanation:
According to Down Detector, the issues started at around 10:41 BST, and are affecting users across the UK.
Of those who reported issues, 74% said they were having problems with their mobile phone, 13% with the network, and 11% with mobile internet.
Speaking to Mirror Online, an O2 spokesperson said: "The earlier issue we experienced where some customers may have had difficulty using mobile data has now been resolved. Our technical teams are continuing to closely monitor the situation. We apologise for any inconvenience."
need help with these three questions!!!
Answer:
6. In order from left to right the balanced coeficcients are,
6, 1, 2, 3
8. [tex]C_{7}H_{10}_{(l)}+6H_{(g)}=C_{7}H_{16}_{(l)[/tex]
9. In order from left to right the balanced coeficcients are,
1, 11, 7, 8
Hadron colliders are able to add protons in an element. When a proton is added to an existing element then;
1.An ion is formed with same number of electrons
2. Another isotope of the element is formed with same number of neutrons
3. A second nucleus is formed with more neutrons
4. Another element is formed with greater atomic number
Answer:
4. Another element is formed with greater atomic number
Explanation:
Ions only have a different amount of electrons and have the same amount of protons and neutrons.
Isotopes only have a difference in neutrons.
However, only a difference in protons will make another element.
Hence, 4 is the answer.
Hope this helped!
How can room things in a house save energy? List at least 5 ways in which you can save heat energy. Explain how each one can save heat energy.
Answer:
brainly
Explanation:
Adjust your day-to-day behaviors.
Replace your light bulbs.
Use smart power strips.
Install a programmable or smart thermostat.
Purchase energy efficient appliances.
difference between proton and electron
a proton is a type of particle with a positive charge and an electron is a particle with a negative charge. neutrons ould be a neutral particle.
Hello! Please help.
Is air an element, compound, or mixture?
Is Hydrochloride Acid an element, compound, or mixture?
Oh if you can could you put the explanation of one of them, thank you!
Answer:
Air is a mixture. Its constituents can be separated. For example: oxygen, nitrogen etc.
Hydrochloric acid is a mixture, being an acidic liquid.
A cone has a diameter of 4 inches and a height of 7 inches. Find the volume
of the cone. Use 3.14 for II.
Volume of a cone: II rh
177.2 in.
29.3 in.3
351.7 in.
87.9 in.
Answer:
V = 29.3 inch³
Explanation:
Given data:
Diameter of cone = 4 inch
Height of cone = 7 inch
Volume of cone = ?
Solution:
Formula:
V = πr²h/3
we calculate the radius from diameter,
r = 4 inch/2 = 2 inch
Volume:
V = 3.14 ×(2 inch)² × 7 inch/3
V = 3.14 × 4 inch² × 7 inch/3
V = 29.3 inch³
how many group and periods are there in modern periodic table
Answer:
there is 7 periods and 18 groups
Explanation:
What is the anode of a galvanic cell made with zinc and aluminum?
O A. Aluminum ions
B. Zinc metal
O C. Aluminum metal
D. Zinc ions
Answer:
Aluminum Metal
Explanation:
A P E X states that it is Aluminum Metal 100% right
As a river’s slope increases, the power of the river to cause erosion usually decreases. Please select the best answer from the choices provided T F
Answer:
False
Explanation:
It is absolutely false that as the river's slope increases the power of the river to cause erosion usually decreases.
The right statement is vice versa because as the slope of the river increases, the ability of the river to cause erosion increases.
The slope of a river is its gradient. As the slope of a river increases so also is its erosive power. The erosive power of a river depends on gravity. As the river becomes more vertical, then the gravity effect increases. This increases the power the river has for erosion.Answer:
false
Explanation:
just cause its right and i took the test
Status
Exam
HF is
an acid
a base
neither an
acid nor a
base
Copyright © 2003 - 2020 Acellus Corporation. All Rights Reserved.
Is HF a base, acid or non
Answer:
HF is an acid as it losses hydrogen into the sollution on hydrolysis.
Explanation:
What is the correct formula for combining Mg2+ and Br1+
Answer: The correct formula is [tex]MgBr_2[/tex]
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here magnesium is having an oxidation state of +2 called as [tex]Mg^{2+}[/tex] cation and bromine [tex]Br^{-}[/tex] is an anion with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]MgBr_2[/tex].
The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic bond.
Write the balanced chemical reaction between baking soda and vinegar.
Answer
a ecuación química para la reacción es: Bicarbonato sódico + vinagre = Acetato de sodio + agua + dióxido de carbono NaHCO3 + CH3COOH => CH3COO-Na+ + H2O + CO2 De la anterior fórmula, puede calcularse que una cucharadita de vinagre produce aproximadamente 1'5 gr de CO2
What variable represents specific heat in the equation Q = mCAT?
O A. The variable c
O B. The variable T
C. The variable m
O D. The variable Q
Answer:
the variable A represented specific heat capacity
Answer: The Variable T
Explanation:
In the equation
FeCl3+ O2 -->Fe2O3 +Cl2
if 6 moles of FeCl3 react with 3 moles of oxygen, what is the excess reactant?
Answer:
FeCl₃ is present in excess.
Explanation:
Given data:
Number of moles of FeCl₃ = 6 mol
Number of moles of oxygen = 3 mol
Excess reactant = ?
Solution:
Chemical equation:
4FeCl₃ + 3O₂ → 2Fe₂O₃ + 6Cl₂
Now we will compare the moles of reactant with product.
FeCl₃ : Fe₂O₃
4 : 2
6 : 2/4×6= 3
FeCl₃ : Cl₂
4 : 6
6 : 6/4×6= 9
O₂ : Fe₂O₃
3 : 2
O₂ : Cl₂
3 : 6
Less number of moles of product are formed by the oxygen thus it will act as limiting reactant while FeCl₃ is present in excess.
What is the average atomic mass of strontium
The answer is 87.62 u
Answer:
Atomic number: 38
Electrons per shell: 2,8,18,8,2
Symbol: Sr
the side chains of amino acids may contain..
a) acidic and basic groups.
b) polar groups.
c) nonpolar groups.
d) All of the above
Answer:
(d) All of the above
Explanation:
Acidic:-
Glutamic Acid
Basic:-
Lysine
Polar:-
Histidine
NonPolar:-
Leucine
The side chain of amino acids may contain
d) all of the above
Amino acids are the building blocks of proteins.
Amino acids:Amino acids are the building blocks of proteins and play an important role in body functions. They are needed for vital processes like cell building and synthesis of hormones and neurotransmitters (brain chemicals). They may also be taken as supplements.
They contain acidic and basic groups, polar and non-polar groups as well.
Examples are Alanine, Arginine, Asparagine, etc.
Find more information about Amino acid here:
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This substance consists of two or more different elements chemically combined
What is the name of this atom's model that is commonly used by
Chemistry students to show the basic structure of an atom?
"Plum Pudding model" by JJ Thomson
"Bohr's Model" by Neils Bohr
"Rutherford's Model" by Ernest Rutheforf
Answer:
It is the "Bhor's Model"
Explanation:
Nearly two-thirds of the students ranked the electron cloud and Bohr-model as their two most preferred representations. Students invoked ideas from classical mechanics to interpret the electron cloud model and used probabilistic language to describe the Bohr model of the atom.
Find the volume of 200g of benzene, if the density of benzene is 0.88 g/mL.
Answer:
227.27 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{200}{0.88} \\ = 227.2727...[/tex]
We have the final answer as
227.27 mLHope this helps you
The specific heat of iron is 0.46 J/g°C. How many joules will it take to make the temperature of a 150. g bar go up from 25°C to 60.°C?
Answer:
Q = 2.415kj
Explanation:
Q = Mc∆temperature
c = 0.46j/g°c = 0.46kj/kg°c
mass = 150g = 0.15kg
∆temperature = 60 - 25 = 35°c
Q = 0.15 X 0.46 X 35 = 2.415kj
Q = 2.415kj
Which statement best describes a primary occurrence in an uncontrolled fission reaction.
Incomplete question. Options;
A) Mass is created and energy is released.
B) Mass is created and energy is stored.
C) Mass is converted to energy, which is released.
D) Mass is converted to energy, which is stored.
Answer:
Mass is converted to energy, which is released
Explanation:
Basically, when uncontrolled nuclear fission (splitting) occurs, a radioactive atom (a mass) is split into two smaller nuclei leading to a continuous chain of fission reactions.
In other words, as the fission of the mass of the atom continues to occur, the mass is converted to energy, which is then released and more reactions occur.
What is the mass of an object that has a density of 2,86 g/mL and a volume of
75 mL
Answer:
214.5 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 75 × 2.86
We have the final answer as
214.5 gHope this helps you