Answer:
d Rubidium
Explanation:
The atomic radius of an atom is the distance from the center of the nucleus to its outermost electron.
The atomic radius of elements varies in the periodic table, it increases as you go down in a group and decreases along the period from left to right.
All the elements listed: Hydrogen, Sodium, Lithium and Rubidium belong to the same group in the periodic table (group 1), Since atomic radius increases from top to bottom in a group, Rubidium has the largest atomic radius.
What are some lessons from
past epidemics that we can
apply to our current coronavirus pandemic?
Answer:
The 1918 influenza pandemic and 2002-2003 SARS outbreak suggests social distancing measures, communication, and international cooperation are the most effective methods to slow down the coronavirus.
Explanation:
Guys, please help me and tell me how you found the answer!
If a gas has a pressure of 1.69 atm at a temperature of 300 K, what will the pressure change to if the container is cooled to 100 K?
Also
If a gas has a pressure of 715 mm Hg at the temperature of 500 K, what will the pressure change to if the container is heated to 900 K?
Answer:
The First one is: 0.563atm
The second one is: 1.692atm
Hope this helps!
Explanation: Look at Photo Attached
The pressure has been reduced with the cooling of the container, and the change in pressure has been 1.06 atm. The pressure has been increased with the heating of the container and the change in pressure has been 572 mm Hg.
Assuming the gas has been following the ideal behavior. According to the ideal gas equation,
PV =nRT
If the same gas has been heated, the n and R will be constant, as well as with the constant volume of initial and final pressure, the relationship to the P and T can be given as:
[tex]\rm \dfrac{Initial\;pressure}{Initial\;temperature}\;=\;\dfrac{Final\;pressure}{Final\;temperature}[/tex]
(a) For the gas with an initial pressure of 1.69 atm, the final pressure will be:
[tex]\rm \dfrac{1.69}{300}\;=\;\dfrac{Final\;Pressure}{100}[/tex]
Final pressure = 0.563 atm.
The change in pressure = Initial pressure - Final pressure
The change in pressure = 1.63 - 0.563 atm
The change in pressure = 1.06 atm.
The pressure has been reduced with the cooling of the container, and the change in pressure has been 1.06 atm.
(b) For the gas at initial pressure 715 mm Hg, the final pressure will be:
[tex]\rm \dfrac{715}{500}\;=\;\dfrac{Final\;Pressure}{900}[/tex]
Final pressure = 1,287 mm Hg.
The change in pressure = Final pressure - Initial pressure
The change in pressure = 1,287 - 715 mm Hg
The change in pressure = 572 mm Hg
The pressure has been increased with the heating of the container and the change in pressure has been 572 mm Hg.
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How many atoms in 8.9 moles of iron
Answer:
5.3578e+24
Explanation:
1 mole = 6.02 x 10^23
6.02 x 10^23 x 8.9 =
5.3578e+24
Plz answer quickly with explanations. .....
Answer:
It would be gas b. The gas you are talking about is carbon dioxide and for the reaction to work the gas needs to be bubbled through into the lime water.
Explanation:
The carbon dioxide reacts with lime water which is a solution of calcium hydroxide to form the white precipitate of calcium carbonate CaCO 3.
What is the converse of the conditional statement?
Ifx is even, then x + 1 is odd.
If x is not even, then x + 1 is not odd.
Ifx + 1 is odd, then x is even.
Ifx + 1 is not odd, then x is not even
Ifx is even, then x + 1 is not odd.
Answer:
Conversing the conditional statement is nothing but switching the hypothesis and conclusion. Therefore, the converse of the given conditional statement will be “If x is odd, then x+1 is even.
Explanation:
The converse of the conditional statement is if x is odd, then x+1 is even.
What is conditional statement?A conditional statement is defined as a specific kind of compound sentence that meets the "if...then" requirement. If the hypothesis is correct but the conclusion is untrue, a conditional statement is false. Programming language elements called conditional statements, expressions, or simply conditionals instruct the computer to take specific actions.
Reversing the two statements that make up a categorical or implicational statement yields its opposite. Carry on a discussion is more properly referred to as "converse." Let's say there is a conditional statement of the form "If p then q." If q, then p is the converse. In a symbolic sense, q p is the opposite of p q. The reverse of a conditional assertion is not logically comparable.
Thus, the converse of the conditional statement is if x is odd, then x+1 is even.
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what is the formula for S5O3
how many grams of H20 will be produced by 18g H2
Answer:
160.86 g to the nearest hundredth.
Explanation:
H2 + O ---> H2O
2.016 g H2 produces 18.016 g H2O
1g .. .. .. .. .. 18.016 / 2.016 g H2O
18g .. .. .. .. .. . . (18.016 * 18) / 2.016 g H2O.
= 160.86 g.
Where are you likely to find Safety Data Sheets at the client site? (choose the
best 2 options)
On the computer as an electronic file
In a work area where the chemicals are stored or used
In the manager's office
In the lobby area
Water boils at 100°C at sea level. If the water in this experiment did not boil at 100°C, what could be the reason?
An electron na hydrogen atom moves from level to level 4 The electron then drops from level 4 to level 2. Which statement
bese most likely test
The energy absorbed in the first move equals the energy released in the second move
The energy absorbed in the first move is greater than the energy released in the second move
The energy released in the first move equals the energy absorbed in the second move
The energy released in the first move is greater than the energy absorbed in the second move
Answer:
The energy absorbed in the first move is greater than the energy released in the second move.
Explanation:
The greater the level number the greater the energy.
A movement up a level requires energy so energy id absorbed.
Dropping down a level releases energy.
Hi. Please I need About 20 Questions on Grahams Law of diffusion. Optional : ( with solutions.) Any amount of questions ranging from 5 will be appreciated
Answer:
I have posted some questions I used when learning Graham's law of diffusion
Explanation:
i posted 16 questions
I hope it helps.
What gas is produced by the re
baking soda?
a. oxygen
B. petroleum
С. helium
D. Carbon dioxide
Answer:
D. Carbon dioxide
Explanation:
Explanation:
What gas is produced by the re action of
baking soda?
Baking soda Formula: NaHCO₃
Water Forumula: H2O
Carbon Dioxide Formula: CO2
So I'm going to guess the question was baking soda with water
NaHCo3 + H2O = NaCo3 + H3O
Hmm, nope that's not it.
Maybe it meant decomposition
NaHCO3 = Na2CO3 + H2O + CO2
In which case it would be Carbon Dioxide
Mantle material rises in convection currents because heated materials become more dense.
True Or False
Answer:
True
Explanation:
Help!!
Which of the following is a chemical reaction?
a. New atoms are formed when substances are mixed together
b. A solid material melts and becomes a liquid
c. Atoms of the reactants rearrange to form a new substance
Answer:
C-Atoms of the reactants rearrange to form a new substance
Explanation:
Answer:
The answer is A.
Explanation:
B. is called a physical reaction
And C. is just a rearrangement.
PLEASE HELP ME ASAP Explain why each of these elements occurs as diatomic molecules. Match the words in the left column to the appropriate blanks in the sentences on the right.
Answer:
The answer to your question is given below
Explanation:
1. When two hydrogen atoms pair together, they form a single bond to achieve complete duet.
Hydrogen atom has 1 shell and 1 valence electron and they contribute it to form bond, thereby obtaining a stable duet configuration
H + H —> H–H —> H2
2. When two halogen atom pair together, they form a single bond to achieve a complete octet which is stable. For example, Cl has 7 electrons in its outermost shell and need 1 more electron to complete it octet. Each Cl will contribute 1 electron each to form a single bond..
Cl + Cl —> Cl–Cl —>Cl2
3. When two oxygen atoms pair together, they form double bond to achieve a complete octet which is a stable configuration.
Oxygen has 6 electrons in its outermost shell and needs 2 more electrons to complete its octet configuration. Each oxygen atom will contribute 2 electrons each to form a double in order to complete it octet configuration.
O + O —> O=O —>O2
4. When two nitrogen atom pair together, they form a triple bond to achieve a complete octet which is stable. Nitrogen has 5 electrons in its outermost shell and needs 3 more electrons to complete it octet configuration. Each nitrogen atom will contribute 3 electrons each to form a triple bond in order to complete its octet configuration.
N + N —> N≡N —> N2.
The explanation as to why each of the elements occurs as diatomic molecules is as follows;
When two hydrogen atoms pair together, they form a single bond to achieve complete duet.Hydrogen atom has only the 1 shell and 1 valence electron and an Hydrogen molecule is formed when the duet is achieved.
H + H —> H–H —> H2When two halogen like Chlorine, Cl (each with a valency of 7) atoms yields a single bond to achieve a complete octet which is stable. Each Cl will contribute 1 electron each to form a single bond..
Cl + Cl —> Cl–Cl —>Cl2Upon bonding of two oxygen atoms, a double bond is formed to achieve a complete octet which is a stable configuration.
Oxygen has a valency of 6 and needs 2 more electrons to complete its octet configuration. Each oxygen atom will contribute 2 electrons each to form a double in order to complete it octet configuration.
O + O —> O=O —>O2When two nitrogen atom pair together, they form a triple bond to achieve a complete octet which is stable.
Nitrogen has a valency of 5 and needs 3 more electrons to assume an octet configuration. Each nitrogen atom will contribute 3 electrons each to form a triple bond in order to complete its octet configuration.
N + N —> N≡N —> N2.Read more;
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How do cold temperatures extend the amount of time an organ can be
detached from the body before a transplant?
A. Cold temperatures provide the organ
with
oxygen.
B. Cold temperatures increase cell replication in the organ.
C. Cold temperatures slow the rate at which cells die.
D. Cold temperatures increase the amount of oxygen the organ
needs.
Answer:
cold temperatures slow the rate at which the cells die.
Explanation:
the answer is c
The correct answer is option C. Cold temperatures slow the rate at which cells die.
At what temperature do cells die cold?Temperatures between 46 ° C and 60 ° C are associated with irreversible cell damage proportional to exposure time (8, 9). Protein coagulation occurs quickly between 60 ° C and 100 ° C, causing irreversible damage to important cytosol and mitochondrial enzyme-nucleic acid-histone complexes.
Cold temperatures can also slow down cell growth by preventing cell hypertrophy. In extreme situations, Prolonged exposure to freezing temperatures can cause intracellular fluids to begin to freeze, forming crystals that penetrate the membrane and eventually kill the cells.
Perhaps by reducing elasticity and preventing the uptake of lipid substances into the expanding membrane. Tissue swelling at low temperatures causes lesions in the cell membrane and can cause cold wounds.
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Pressure increases from Earth’s surface toward the center of Earth.
True Or False
Answer:
True
Explanation:
The center receives pressure which is what creates convection currents
What is the potential energy of the bowling ball as it sits on top of a building?
Answer:
Potential energy is the amount of energy calculated from an object's height off the ground.
Explanation:
Potential energy = Mass x Height x Gravity
Count then plot the total number of atoms in the reactants to total atoms
in the products for the equation 2H2 + O2 + 2H2O
What is a chemical equation?
A. a substance
B. a shorthand representation of a chemical reaction
C. a shorthand representation of a chemical bond
D. a diatomic molecule
Steel:
Propane:
Calcium chloride:
Water:
Answer:
Steel is a metallic bond
Propane is a covalent bond
Calcium Chloride is an Ionic Bond
Water is a covalent bond
Explanation:
ence a material's properties, identify each of the , ionic, covalent, or metallic bonds
Ionic Bonds are where the extra outer electron of one atom transfers to the other atom.
Covalent Bonds are where the outer electron of one atom takes the open path to the nucleus (negative valance) of a 2nd atom.
Metallic Bonds are formed from the attraction between free electrons and fixed positively charged metallic atoms. Metallic bonds extend over the entire molecular structure.
Substance Properties
Steel Conducts electricity as solid and liquid
Propane Low melting point
Calcium Chloride Conducts electricity when dissolved in water
Water Solid form is brittle, melts at 0C
Steel is an alloy of carbon, iron and other things
Propane = C3H8 C4- H+
Calcium Chloride = CaCl2 = Ca2+ Cl-
Water = H2O = OH- and H+
The best method to improve air quality is to
A. use technology to reduce the pollutants in air
b. produce less pollution
c. produce less pollution and use technology to reduce the pollutants in air
d. better utilize land and technology to prevent pollution
Please select the best answer from the choices provided
Answer:
A produce less polution
Explanation:
Answer:
C) produce less pollution and use technology to reduce the pollutants in air
Explanation:
EDG2020
What happens to mass in an isolated system?
Answer:
In isolated sysrem mass remains constant.
Explanation:
Answer:
Yes is remains constant
Explanation:
Isolated systems can't make energy or matters come in or out, so the mass stays the same.
Think of it as a marble in a balloon once you tie it and shake the marble in the balloon, there is no extra marbles coming in nor is the marble out of the balloon so that mass(weight is the same.
Which gas relights a glowing splint? *
C hydrogen
A ammonia
B carbon dioxide
D oxygen
Answer:
Oxygen
Explanation:
A glowing splint applied to a sample of gas "oxygen" will relight.
write the balanced standard combustion reaction for the c5h7on3s2
Answer:
4C5H7ON3S2 + 25O2 —> 20CO2 + 14H2O + 6N2 + 4S2
Explanation:
When C5H7ON3S2 under go Combustion, the following are obtained as illustrated below:
C5H7ON3S2 + O2 —> CO2 + H2O + N2 + S2
Now, let us balance the equation. This is illustrated below:
C5H7ON3S2 + O2 —> CO2 + H2O + N2 + S2
There are 3 atoms of N on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of C5H7ON3S2 and 6 in front of N2 as shown below:
4C5H7ON3S2 + O2 —> CO2 + H2O + 6N2 + S2
There are 20 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 20 in front of CO2 as shown below:
4C5H7ON3S2 + O2 —> 20CO2 + H2O + 6N2 + S2
There are 28 atoms on H on the left side and 2 atoms on the right side. It can be balance by putting 14 in front of H2O as shown below:
4C5H7ON3S2 + O2 —> 20CO2 + 14H2O + 6N2 + S2
There are 8 atoms of S on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of S2 as shown below:
4C5H7ON3S2 + O2 —> 20CO2 + 14H2O + 6N2 + 4S2
Now, there are a total of 54 atoms of O on the right side and 6 atoms on the left side
It can be balance by putting 25 in front of O2 as shown below:
4C5H7ON3S2 + 25O2 —> 20CO2 + 14H2O + 6N2 + 4S2
Now, we can see that the equation is balanced.
A student is trying to dissolve 20 grams of sugar in a beaker containing 250 milliliters of water at room temperature. What can the student do to make the sugar dissolve faster in the water? a. decrease the temperature of the water b.use larger pieces c.stir rapidly d.use less water
Answer:
C. Stir rapidly
The Law of Conservation of Matter
states that matter cannot be created
or
a. enlarged
B. changed
C. broken
D. destroyed
Answer:
The law of conservation of matter indicates that matter cannot be created nor destroyed.
So D Destroyed
Values for the molar mass of nitrogen, oxygen, and nitrogen dioxide molecules are given in the table below. What mass of nitrogen dioxide molecules is formed when 1 mole of nitrogen reacts with 2 moles of oxygen and forms nitrogen dioxide? Choices: A). 92.02g B). 46.01g C). 23.00g D) 2.00g
Answer:
A). 92.02g
Explanation:
Equation of the reaction;
N2 (g)+ 2O2(g)------> 2NO2(g)
Note that the balanced reaction equation is the first step in solving any problem on stoichiometry. Once the reaction equation is correct, the question can be easily solved.
Reaction of one mole of nitrogen gas with two moles of oxygen gas yields two moles of nitrogen dioxide.
Mass of two moles of nitrogen dioxide= 2[14 + 2(16)] = 2[14+32]= 2[46]= 92 gmol-1
Therefore; Mass of two moles of nitrogen dioxide is 92
A company wants to put a fleet of low Earth satellites in orbit to create a worldwide telephone link. There is less of a time lag in the conversations the closer to the ground the satellites are. What advantage is there to putting them 700 km up, instead of 250 km up in the sky
how does the sun rise and set on the spring and fall equinox
Answer:
Actually, the Sun only rises due east and sets due west on 2 days of the year the spring and fall equinoxes! On other days, the Sun rises either north or south of "due east" and sets north or south of "due west." ... At the fall equinox, the Sun rises due east and sets due west.
Explanation:
Sunrise and Sunset - Stanford Solar Center