Answer:
Here is what I got from reading this question...
Explanation:
So if you dissolve 7.5625- g of CaCl2 in water, dissolve well and then add distilled in a 250- ml standard flask upto the mark and shake well for uniform Concentration, you will get 0.25- M CaCl2 solution.
Rank these elements from smallest to largest atomic radii: zinc, calcium, radium, and bromine.
Select one:
O a. calcium, radium, zinc, bromine
O b. calcium, zinc, bromine, radium
c. bromine, zinc, calcium, radium
d. bromine, zinc, radium, calcium
Answer:
The correct option is;
c. Bromine, zinc, calcium, radium
Explanation:
The atomic radii of the elements as arranged in the periodic table decreases across the period and increases down the groups
The location of each of the elements are;
Zinc: Period 4, Group 12
Calcium: Period 4, Group 2
Radium: Period 7, Group 2
Bromine: Period 4, Group 17
Therefore, the element with the largest atomic radius = Radium
The element with the smallest atomic radius = Bromine
Calcium comes before zinc on period 4, therefore, the atomic radius of calcium is larger than that of zinc
The rank of the elements from smallest to largest atomic radius is therefore;
Bromine, zinc, calcium, radium.
why estuaries are an important habitat for many marine organisms in comparison to the open ocean?
Answer:
There are more nutrients available in estuaries. There are more nutrients available in estuaries.
Explanation:
How many moles of oxygen are needed to burn 2.7 moles of methyl
alcohol (CH3OH)?
2CH2OH + 302 -→ 2CO2 + 4H2O
please show how you got it
Answer:
3.38 moles of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
4CH2OH + 5O2 → 4CO2 + 6H2O
From the balanced equation above,
4 moles of CH2OH required 5 moles of O2 for complete combustion.
Finally, we shall determine the number of mole of O2 needed to react with 2.7 moles of CH2OH. This can be obtained as follow:
From the balanced equation above,
4 moles of CH2OH required 5 moles of O2 for complete combustion.
Therefore, 2.7 moles of CH2OH will require = (2.7 × 5)/4 = 3.38 moles of O2 for complete combustion.
Thus, 3.38 moles of O2 is required.
how are compounds Similar to elements and how are they different
Answer:
A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds. They contain only one type of molecule.
A wooden block has a mass of 562 g and a volume of 72 cm3. What is the density rounded to the nearest tenth!
Answer:
The answer is 7.81 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{562}{72} \\ = 7.80555555...[/tex]
We have the final answer as
7.81 g/cm³Hope this helps you
Answer:
r
Explanation:
What volume of oxygen will react with 50cm^3 of nitrogen monoxide?
Answer:
GIVE BRAINLIEST PLEASE!!! Answer - 50cm^3 of oxygen
Explanation:
They need (almost) equal amounts of substance to react
hope this helps <3
what is the half life?
HELP BRAINLIEST
Answer:
the time taken for the radioactivity of a specified isotope to fall to half its original value.
Oxygen in liquid form can be separated from air by
Chromatography
Simple distillation
Fractional distillation
Centrifugation
Answer:
Explanation:
Fractional distillation uses the different boiling points of the main elements of air. As the liquid air is heated, the elements change from liquid to gas and separate from one another. At this point, the carbon dioxide will become solid and drop from the cooled air, leaving nitrogen, oxygen and argon in the air.
Answer:
Fractional distillation
Explanation:
Calculate the new volume if in a container there is a mass of gas that occupies a volume of 1.3L at a temperature of 280K. Calculate the volume when reaching a temperature of 303K.
Answer:
1.4 L
Explanation:
From the question given above, the following data were obtained:
Initial volume (V1) = 1.3 L
Initial temperature (T1) = 280 K
Final temperature (T2) = 303 K
Final volume (V2) =?
With the above data, we can obtain the new volume of the gas by using the Charles' law equation as shown below:
V1 /T1 = V2 /T2
1.3/280 = V2 /303
Cross multiply
280 × V2 = 1.3 × 303
280 × V2 = 393.9
Divide both side by 280
V2 = 393.9/280
V2 = 1.4 L
Thus, the new volume of the gas is 1.4 L
Complete each of these
what is physical change?
Answer:
A physical change is any change in matter that involves the substance going from one physical state to another. The reference to a physical state involves solids, liquids, and gases.
Explanation:
How many moles of tungsten atoms are in 4.8x10^23 atoms of tungsten?
A. 1.3 x 10^-1 moles
B. 8.0 x 10^2 moles
C. 1.3 x 10^-2 moles
D. 8.0 x 10^1 moles
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{4.8 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{4.8}{6.02} \\ = 0.797342192 \\ [/tex]
We have the final answer as
8.0 × 10-¹ molesHope this helps you
Answer: D. 8.0 x 10^-1 moles
Explanation:
What are the types of ions found in an ionic bond? (Check all that apply) * 2 points
cations
anions
prions
quarks
The right options is a cation and an anion !
Jaime calculates the density of a slab of aluminum (Al) metal.
What information does Jaime need to evaluate the accuracy of his calculation?
the accepted value for the density of aluminum
the dimensions of the slab of aluminum that he used
a bar graph that shows the densities of different slabs of aluminum
a line graph that shows how the density of aluminum varies with temperature
Answer: the accepted value for the density of aluminum
Explanation:
took the test
Which of the following notations is the correct noble gas configuration for Li
Noble gas configuration for Li : [He]2s¹
Further explanationIn an atom, there are levels of energy in the shell and sub-shell
This energy level is expressed in the form of electron configurations.
Lithium with atomic number 3, then the electron configuration:
1s²2s¹
And for noble gas configuration or it can be called Condensed electron configurations :
[He]2s¹
Answer:
[He]2s¹
Explanation:
The heat of fusion of a metal is 7.62 J/g at its freezing point of 592°F. How much energy is required to melt 257 g of this metal (already in 592°F)?
Answer:
7.62 plug into the equation for freezing
0= 592/7.62x x 90
0 = 77.69x x 90
x=0
therefore according to balton's law, it is required to have 0 + 27.222222222 (balton's number) to get the energy required.
answer is 27.222222 rounded 27. cheers.
This committee, known as the International Union of Chemistry (IUC), developed a specific set of rules for
chemists to follow. What were these rules called?
O
The nomenclature rules
O
The IUC rules
The Geneva rules
The Paris rules
Answer:
Nomenclature Rules
Explanation:
Answer: Its actually the geneva rules
Explanation:
Covalent bonds form through:
a. a combination of transfer of electrons and sharing electrons such that each atom attains an octet.
b. complete transfer of electrons to form cations and anions.
c. sharing of electrons such that each atom attains an octet.
d. sharing of electrons such that each atom attains a total of 10 ve.
Answer:
Sharing of electrons such that each atom attains an octet
What is the mass of 1.34x10^24molecules of Iron? *
Answer:
Ion channel proteins allow ions to diffuse across the membrane. A gated channel protein is a transport protein that opens a "gate," allowing a molecule to pass through the membrane
Explanation:
a024
Object
Yepop (yp)
copper wire
132 yp
copper spoon 240 yp
glass jar
wooden spoon 240 yp
89 yp
1 point
8. A student believes she has measured a new property of matter that she
did not learn about in class. She calls her new property "Yepop". Above is a
table of Yepop measurements for different objects: Based on her results,
do you think "Yepop" is a property of matter?
A. No, because the copper objects have different measurements.
B. No, because the same substances have the same measurements.
C. Yes, because the spoons have the same measurements.
When electricity is passed through a common salt solution. Sodium hydroxide is
produced along with the liberation of the two gases X and Y. X burns with pop
sound whereas Y is used for disinfecting drinking water.
a) Identify X and Y
b) Give the chemical equation for the reaction stated above
c) State the reaction of Y with dry slaked lime,
Answer:
a)oxygen and chlorine
b) H20+NaCl= NaOH + O+ Cl
c) Cl2+ Ca(OH)2=CaOCl2+CaCl2 +HCL
Explanation:
electricity splits up the molecules for water and hydrogen displaces chlorine because its is more reactive.
Is this tinder like my guy
how many moles of hydrogen are in 4.70 moles of C12H22O11
Answer:
103.4 moles of hydrogen
Explanation:
Given data:
Moles of C₁₂H₂₂O₁₁ = 4.70 mol
Number of moles of hydrogen present = ?
Solution:
one mole of C₁₂H₂₂O₁₁ contain 22 moles of hydrogen. Thus in order to determine total number of moles in 4.70 moles of C₁₂H₂₂O₁₁ we will multiply the 22 moles of hydrogen with 4.70 moles of C₁₂H₂₂O₁₁.
1 mole of C₁₂H₂₂O₁₁ = 22 moles of Hydrogen
4.70 × 22 moles
103.4 moles of hydrogen
Why is soap mixed with water?
A. The soap becomes chemically active when mixed with water.
B. The soap turns the water molecules into a nonpolar solvent.
C. It covalently bonds to the water so it can be washed away.
D. Its polar end mixes with the water so it can be washed away.
The polar end of soap can be bonded with the polar end of water. Hence it can be mixed with water and can be washed away. Hence, option D is correct.
What is the action of soap in water?Soap is acting as a surfactant in water and oily surface of dirt. A lengthy chain of fatty acids is saltified with sodium or potassium to form a soap molecule. Soap is made up of two components: an ionic component and a long carbon chain.
The characteristics of the two molecules that make up soap are highly dissimilar. These two pieces are referred to as soap's hydrophobic tail dissolves in oils and is naturally water-repellent. It has an ionic makeup.
The second part hydrophilic head, or water-loving portion of the soap molecule, dissolves in water. It is composed of a very long hydrocarbon chain. Therefore, the hydrophilic head of soap molecule easily binds with water and can be washed away.
Find more on action of soaps:
https://brainly.com/question/27660538
#SPJ1
When two balls collide, the momentum of the balls after the collision is explained by?
Answer:
(m1+m2)v
Explanation:
where m1 is the mass of the first body
m2 is the mass of the second body
v is the velocity
A precipitate is formed when the two solutions, barium nitrate, Ba(NO3)2, and phosphoric acid, H3PO4, are
mixed. Identify the correct products for this reaction.
A)
BaHa & NPO4
B)
BazN2 & HNO3
Baz(PO4)2 & NO2
D)
Baz(PO4)2 & HNO3
d. Ba₃(PO₄)₂(s)+6HNO₃(aq)
Further explanationDouble-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product
To predict whether this reaction can occur or not is one of them, the precipitation reaction. A precipitation reaction occurs if two ionic compounds which are dissolved reacted to produce one of the products of the ion compound does not dissolve. Formation of these precipitating compounds that cause reactions can occur
Because A precipitate is formed, then compounds of CO₃²⁻ and PO₄³⁻ except for Compounds of Li +, Na +, K +, Rb +, Cs +, and NH₄ + are generally included in the insoluble compound
So the reaction :
3Ba(NO₃)₂(aq)+2H₃PO₄(aq)⇒Ba₃(PO₄)₂(s)+6HNO₃(aq)
A precipitate is formed ⇒ Ba₃(PO₄)₂
When you add so much solute that no more dissolves you have a(n)
Answer:
When you add so much solute that no more dissolves you have a SATURATED SOLUTION.
Answer:
iIt is called as point of saturation or saturated solution
1 of 20
0 0%
In what form (solid, liquid or gas) is crude
oil found?
Enter your answer
Answer:
Gas
Explanation:
Because Crude oil can usually be found in the ground as a liquid and in the air is gas can be kerosene.
Someone please help will mark as brainliest
Answer: no you need a balance skall to make it the correct balance that you want. yes the hypothesis is correct because you change the balance with your balance scale so obviously it's going to make your hypothesis higher.
Explanation: I HOPE THAT HELPED.
Which of the following Best describes how a compound naturally occurs
Answer:for my ap3x test the answer was the molecular formula
Explanation:
Ap3x
Answer:
the molecular formula
a p e x
