Answer: Determination of Equilibrium Constant, Determination of Solubility Products, Determination of pH, Determination of Activity Coefficients,
Explanation:
In the article, Invasion of the Periodical Cicadas, why do scienctists believe that cicadas only reproduce every 13 or 17 years? Explain your answer with evidence from the text.
Hi, you've asked an incomplete question. However, I assumed you are referring to the article found on the Scientific American website.
Explanation:
Remember, according to that article we are told that scientists notice that these insects have a long nymphal (immature form before becoming adults) stage, one that can last up to 13 to 17 years on the ground before they leave the ground looking for mating partners.
Because it is only after mating occurs at this point that their eggs are laid, that is why scientists believe that cicadas only reproduce every 13 or 17 years.
8. An atom of element Z has the
electronic configuration 2.8.6. Which
one of the following statements
about element Z is correct? *
Answer:
See explanation
Explanation:
The question is incomplete but i will try to answer it to the best of my ability.
An element of configuration 2.8.6 is in group 16. This element will form a divalent anion Z^2-
Z is a nonmetal which combines with metals to form ionic bonds. Z can also react with other non metals to form covalent compounds.
Z is expected to have high electronegativity and electron affinity since it is a nonmetal of group 16.
The oxides of Z will dissolve in water to yield acidic solutions.
According to the diagram which statement best describes what happens when two astronauts collide in space? Will give crown!!!!
Answer:
J. Their momentum is conserved
Explanation:
According to the diagram, the best statement that describes what happens when two astronauts collides in space is that their momentum is conserved.
The momentum before collision is 320kgkm/hr and after collision it is 320kgm/s
This collision is an inelastic collision;
momentum before = momentum after
m₁v₁ + m₂v₂ = v(m₁ + m₂)
m₁ = 80kg
v₁ = 4km/hr
m₂ = 80kg
v₂ = 0
v = 2km/hr
Insert the parameters;
(80 x 4) + (80 x 0) = 2(80 + 80)
320 = 320
Describe, in terms of electrons, the difference between a calcium atom and a calcium ion
The Calcium atom has 2 valence electrons but a Calcium ion will have no electrons because it is a cation ion. Meaning that there are more protons than electrons. Also, the normal calcium symbol is Ca but the calcium ion is Ca²⁺
I hope this wasn't too late
If a sample of nitrogen gas is compressed to fit in a smaller container, what happens to the
pressure, assuming the temperature remains constant?
Answer:
The pressure increases
Explanation:
In this action it is best to apply Boyle's law to resolve the problem. This is an interplay between Volume, Pressure and Temperature.
According to Boyle's Law "the volume of a fixed mass of a gas varies inversely as the pressure changes, if the temperature is constant". Since the volume is being reduced to cram into the container, the pressure of the gases increases. In the smaller container, pressure rises and the volume reduces if temperature remains constant.can someone tell me how I find the atomic radius of atoms and what they are. Thank youuuuuuuuu
Answer:
The radius of an atom can only be found by measuring the distance between the nuclei of two touching atoms and then halving that distance. Measuring the atomic radii of chemical elements is a complicated task as the size of an atom is of the order of 1.2×10-10 m. The electron cloud forming the shell of an atom does not have any fixed shape which makes it difficult to determine the atomic size of an atom. So we can say that practically we cannot determine the size of an individual atom.
Atomic Radius:
Atomic radius is the distance from the center of the nucleus to the outermost shell containing electrons.
Explanation:
When energy is changed from one form to another, _____.
all of the energy is changed to a useful form
a physical change occurs
all of the energy can be accounted for
some of the energy is lost entirely
Answer:
some of the energy is lost entirely
Explanation:
When their is a new moon the sun and moon are on the same side of the earth this leads to a combination of gravitational forces causing usually high tides called
Neap tides
Low tides
Supreme tides
Spring tides
Answer:
Low Tides
Explanation:
Took the test
100%
What is a chemical reaction
What is the molarity of a hydrochloric acid solution, when 30.0 mL is neutralized by 48.0 mL of 0.100 mol/L
calcium hydroxide?
The molarity of a hydrochloric acid solution : 0.32 M
Further explanationTitration is a procedure for determining the concentration of a solution by reacting with another solution which is known to be concentrated (usually a standard solution).
Titrations can be distinguished including acid-base titration, depositional titration, and redox titration. An acid-base titration is the principle of neutralization of acids and bases is used.
Acid-base titration formula
Ma. Va. na = Mb. Vb. nb
Ma, Mb = acid base concentration
Va, Vb = acid base volume
na, nb = acid base valence
1 ⇒HCl (valence=1, HCl ⇒H⁺+Cl⁻, one H⁺)
2⇒Ca(OH)₂(valence=2, Ca(OH)₂⇒Ca²⁺+2OH⁻, two OH⁻)
M₂=0.1 M
V₂=48 ml=0.048 L
V₁=30 ml=0.03 L
[tex]\tt M_1.V_1.n_1=M_2.V_2.n_2\\\\M_1\times 0.03\times 1=0.1\times 0.048\times 2\\\\M_1=0.32[/tex]
GIVING BRAINLYY
Tracy is looking at the section of the periodic table shown below. Based on the positions of sodium (Na) and potassium (K) in the table, Tracy can predict that sodium what?
[tex]\huge\boxed{Option B}[/tex]
____________________________________PERIODIC TABLE:The periodic table, arranges the chemical elements ascording to their recurring properties. The number of each element corresponds to the number of protons in its nucleus.
-------------------------------------------------------------------------------------------Groups and PeriodsThere are 8 groups and 7 periods in the periodic table.
_________________________________________________________
Each element within a group has similar physical or chemical properties because of its atom's outermost electron shell. The outermost shell of every element in a specific group has same number of valence shell (most chemical properties are determined by the the outermost valence shell electron). The group number of an element represents the number of electrons in its outermost orbit. This shows that elements arranged in the same group have the same number of electrons in their outermost orbit.
_____________________________________Sodium and PotassiumSodium and Potassium belong to the same group i.e. GROUP 1 which is also called S BLOCK Group or IONIC GROUP. They have the similar properties,
__________________________________________________________
Properties of S block Elements
1- They are soft metals
2- possess low melting and boiling points
3- They have the largest atomic radii in their corresponding periods
4- are good conductors of heat and electricity.
5- They have low values of ionization energies and are hence highly electropositive.
_____________________________________Best Regards,'Borz'The temperature T in Kelvin is 273.15 more than temperature C in degrees Celsius. Use your function to find the equivalent temperature in Kelvin for 100*C.
Answer:
T(K) = 373.15 K
Explanation:
The kelvin is the base unit of temperature in the International System of Units (SI). The symbol used to express temperature in kelvins is K.
The temperature of zero kelvins is called the absolute zero. It is considered to be the lowest possible temperature, although nothing has reached it. The absolute zero (0K) is - 273.15 degrees Celsius.
This is the equation we can use to solve this question:
[tex]T(K) = T(C) + 273.15[/tex]
We have 100*C.
[tex]T(C) = 100 C[/tex]
[tex]T(K) = 100C + 273.15[/tex]
[tex]T(K) = 373.15 K[/tex]
is this correct? and can you tell me yes or no for each one thanks
Answer: Yes it's correct.
Explanation: i hoped that helped!!
Answer:
yes this is correctly done
For each element in the table below, use the Gizmo to find the number of valence electrons and the list the
valence based on the Lewis diagram. Then find the sum of these numbers.
IF SOMEONE COULD JUST HELP ME OR EXPLAIN HOW TO DO IT PLEASE! THANK YOU
Answer:
It's funny cause i'm doing the same exact thing as you.
Explanation:
You need to go to the Gizmo, and it explains everything. But When you're looking at "Valence Electrons" thats how many "dots" (electrons) there are on the outermost circle, so Fluorine has 7 Valence Electrons. To find the valency, you need to first identify the Valence Electrons. Fluorine has 7 valence electrons, and it would be a lot easier for this atom to gain an electron, rather than lose 7. So 8-7 is 1, meaning the Valency of Fluorine will be 1. For the sum, just add the total number, so 7+1 is 8, so the sum of Fluorine will be 8. This is confusing, so I'm sorry if this doesn't make sense.
Answer:
Explanation:
not sure if this is totally correct but checked with classmates and this seems to be around what most got
What is the ionic charge of elements in column 1?
Answer:
こんにちは
Explanation:
A mixture contains 20% iron ions by mass. What mass of iron chloride (FeCl) would
you need to provide the iron ions in 50 g of the mixture? A of Fe = 56, A of Cl = 35.5.
.
Mass of iron chloride (FeCl₂) : 22.68 g
Further explanationProust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
With this law, we can calculate how many grams an element is needed to make a compound with a certain mass, as desired
[tex]\tt mass~Fe=\dfrac{Ar~Fe}{MW~FeCl_2}\times mass~FeCl_2[/tex]
The iron ions in 50 g mixture :
[tex]\tt 20\%\times 50~g=10~g[/tex]
[tex]\tt 10=\dfrac{56}{127}\times mass~FeCl_2\\\\mass~FeCl_2=22.68~g[/tex]
if your mass was 200 grams what would your weight be on this planet.
Answer:
200
Explanation:
Explanation:
take your weight times by the amount of newtons in a pound, which is 4.45
then convert newtons into grams.
explain why particles of colloidal solution donot settle down when left undisturbed , while in the case of suspensions they do .?
Answer:
the partial of colloidal are smaller and they are not heavy whereas the partial of suspension are larger but they are heavy and less movement thus they settle down due to gravity
is xenon a metal and is Beryllium a metal
Answer:
No and yes
Explanation:
Xenon is a noble gas and beryllium is a metal
Answer: no and yes i also agree
Xenon is a noble gas and Beryllium a metal
Explanation:
HELP 20 points!
In a manufacturing process why would you prefer not to have a limiting reactant?
Answer:
The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops. ... The limiting reagent is the one that is totally consumed; it limits the reaction from continuing because there is none left to react with the in-excess reactant.
Explanation:
The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops. ... The limiting reagent is the one that is totally consumed; it limits the reaction from continuing because there is none left to react with the in-excess reactant.
HeLlo, HeLp Me PleAsE, Ill MaRk YoU BrAiNlIeSt !
[tex]\huge\boxed{Option C}[/tex]
_____________________________________CALORIMETER:Calorimeter is device used for the measurement of heat. In a calorimeter we can use the temperature change of water to quantify an amount of heat. A calorimeter just captures all the energy released (or absorbed) by a reaction in the water. So Option A and B are wrong as calorimeter don't have anything to do with providing the heat or letting the the heat in, as it is the insulated calorimeter too.
_____________________________________Energy in the reaction:In the formation of any bond there is equal amount of heat required as to break that bond. It means Energy released in the making of bond is equal to the energy required in the breaking of the bond. So Option D is wrong as it says we need more energy in making then breaking.
_____________________________________Enthalpy:Enthalpy is the total heat content of the system. As we provide energy to the reactants and the product is formed, so The enthalpy(heat content) of product is more than the Enthalpy of the reactant, Thus Option C is correct.
Enthalpy is denoted by H or Q, its formula is,
H = U + PV
Where,
U is internal energy
PV is equals to Work done ; P = Pressure, V = Volume
_____________________________________Best Regards,'Borz'Which of the following most completely describes a redox reaction?
O A. A chemical decomposition reaction
B. A hydrocarbon combustion reaction
O c. A reaction resulting in electron sharing
D. An oxidation and reduction reaction
Answer:
D.
Explanation:
Because i just copied the person above tbh, and i also got it right in the quiz
To solve such this we must know the concept of redox reaction. Therefore, the correct option is option D that is an oxidation and reduction reaction.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously. Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant.
Therefore, the correct option is option D that is an oxidation and reduction reaction.
Learn more about the chemical reactions, here:
https://brainly.com/question/3461108
#SPJ2
At which temperature and pressure would a sample of helium behave most like an ideal gas?
1
75 K and 500 kPa
2
150. Kand 500 kPa
3
300. Kand 50 kPa
4
600. K and 50 kPa
Submit Answer
Answer: 600K and 50kPa
Explanation:
600k as well as 50kPa since the pressure seems to be the lowest as well as the temperature is the greatest throughout this situation.
Under high temperatures and low pressures, actual gases behaved like ideal gases. such as the rule
[tex]PV=nRT[/tex]Even though at high temperatures, the kinetic energy of such gas particles surpasses the intermolecular attractive forces, — in other words this same potential energy of something like the molecules (gaseous).
Thus the above answer i.e., "option 4" is right.
Learn more:
https://brainly.com/question/1371338
Carbon monoxide (CO) burns readily in oxygen (O2), forming
carbon Dioxide (CO2). Which of the follow equations is shows
this reaction and follows the law of conservation of mass?
Answer:
see attachment......
What causes metamorphic rocks to form from existing rocks?
O magma and minerals
O heat and pressure
O exposure to Earth's mantle
exposure
to Earth's surface
I think it's Heat and pressure
Answer:
heat and pressure did on edge
Explanation:
4x+15-3x+10= help me please
Answer:
7x+5
Explanation:
4x+15-3x+10
-10 -10
--------------------
4x+5-3x
+3x. +3x
---------------------
7x+5
pls help me!!!!!!!
what are the elements found within the inner core of the earth??
im getting graded for this!! tyyyy
Answer:
Explanation:
iron
If the pressure on the surface of water in the liquid state is
40 kpa, the water will boil at?
Answer:
sdfs
Explanation:
dfsdfsdfs
How do I do an energy profile diagram
Answer:
first u have to like draw like a number line uk how dey do in math but instead of num u add wht eva da question askin u
Explanation:
Sodium thiosulfate mixed with hydrochloric acid makes a green precipitate is this a physical or chemical change?
a. Physical
b. Chemical
Can someone help me answer this I will give you brainliest
Answer:
I don't know the answer you can search it on Google you will get it and don't forget to follow me and mark me as brainlest please I will follow u back really if u follow me back
Answer:
It is chemical Change
Explanation:
Because you are changing the substance.