Answer:
Option D - It tells which compounds will dissolve in water.
Explanation:
It is used to predict whether or not a given ionic compound is soluble.
Answer:
d
Explanation:
10 mL of a 0.65 M KMnO4 solution is diluted to a concentration of 0.055 M. What is the final volume of the diluted solution?
a. 20.0 mL
b. 0.846 mL
c. 108 ml
d. 118 ml
Answer:
118 mL
Explanation:
We can easily calculate the final volume of the solution (V₂) by applying the following mathematical expression:
V₁ x C₁ = V₂ x C₂
⇒ V₂ = V₁ x C₁/C₂
Given:
V₁ = 10 mL
C₁ = 0.65 M
C₂ = 0.055 M
We replace the data in the mathematical expression to calculate V₂:
V₂ = V₁ x C₁/C₂ = 10 ml x (0.65 M)/ (0.055 M) = 118.18 mL ≅ 118 mL
Density = Mass
Volume
To find the density of a solid:
Find the mass of the block.
Find the volume of the block using (length x width x height)
Use the equation to find density.
#1 #2 #3 #4 #5 = (2x3x4) #1/#5
Block #
Mass (g)
Length (cm)
Width (cm)
Height (cm)
Volume
(cm3)
Density (g/cm3)
1
75
6
3
4
72
1.04
2
3
4
5
6
7
8
Follow up questions:
Which two blocks were made out of the same material?
How do you know?
Does a larger block always have a higher density?
Answer:
what is it all about???
Which formula represents an empirical formula
O (1) CH,2
(2) C, H,
(3) CuH
O (4) CH
What is the average Mw for a fatty acid mixture whose fats (1 gram) required 0.0034 equivalents of NaOH to titrate. Remember: 1 Fatty acid has 1 equivalent.
1. Ew = Mw (#H+)
2. Ew = mass/eq
a.) 294.12 g/mol
b.) 145.04 g/mol
c.) 345.56 g/mol
d.) 132.04 g/mol
Answer:
a.) 294.12 g/mol
Explanation:
1 equivalent of fatty acid reacts with 1 equivalent of NaOH.
As in the titration are required 0.0034 equivalents of NaOH, the equivalents of fatty acids = moles of fatty acids are:
0.0034 moles of fatty acids
Molar mass is defined as the ratio between mass of substance in a determined amount of moles. The mass of the fats was 1 gram, that means the molar mass is:
1g / 0.0034moles =
294.12g/mol
Right option is:
a.) 294.12 g/molWhich statement correctly describe the nucleus of the atom
Protons,neutrons,electrons
Part A: You are given a beaker containing a solution of an enzyme that hydrolyzes adenosine triphosphate (ATP) while it generates a lot of heat. You add a substantial amount of the sodium salt of ATP, and you measure the temperature of the beaker, and determine that nothing is happening. The enzyme is not performing the reaction. What is a reasonable chemical to add to the solution to get the enzyme to proceed with the hydrolysis of adenosine triphosphate?
Sulfur oxide,
Iron chloride,
magnesium chloride,
or add more sodium ATP.
Part B: You are investigating the reduction of oxygen that is performed by cytochrome c oxidase. As you start the reaction in a slightly acidic aqueous buffer with 2 mM Cu2SO4 and bubbling oxygen into the buffer. As the reaction proceeds, the solution slowly turns blue, what is happening?
a) Ozone is formed. This causes the solution to turn blue.
b) The copper is getting oxidized from Cu+ to Cu2+ and turns blue.
c) The cytochrome c oxidase protein is decomposing down to a blue product.
d) The pH of the solution is changing. Cu2SO4 is a pH indicator that turns blue when a solution becomes basic.
Part C: In the previous reaction, if you add a small amount of cyanide before adding the
Cu2SO4, the solution does not turn blue. What is a reasonable explanation?
a) The cyanide ion displaces the copper ions in the cytochrome c oxidase and stops the redox reaction.
b) The cyanide ion keeps the pH of the solution high. So the Cu2SO4 pH indicator does not show the decrease in pH.
c) The cyanide ion prevents the formation of ozone.
Answer:
1) magnesium chloride
2) b) The copper is getting oxidized from Cu+ to Cu2+ and turns blue.
Explanation:
The work published by David N. Frick, Sukalyani Banik, and Ryan S. Rypma in J Mol Biol. 2007 Jan 26; 365(4): 1017–1032 clearly shows that divalent metal ions of group 2 such as Mg^2+ play an important role in ATP hydrolysis. Addition of EDTA decreased the rate of hydrolysis of ATP (due to sequestration of the divalent ion of group 2) indicating an active participation of divalent ions in the process.
2) The copper I ion is colourless because it is a d^10 specie. However, when it is oxidized to Cu^2+, a blue colour appears in the solution.
1 carbon atom mixed with 1 oxygen atom what is the formula
Answer:
carbon mono oxide CO
Explanation:
as both are in 1:1 ratio so CO is formed
PLEASE HELP I DONT WANT TO FAIL!! ):
Cesium Bromide and Strontium Nitrate react to form Strontium Bromide and Cesium Nitrate.
a. Write out the word equation representing this reaction
b. Write out the skeletal equation representing this reaction
c. Write out the balanced equation representing this reaction
Help pls 50 points and brainliest.
Matter is made up of heat energy and______energy.
1. chemical
2. light
Answer:
Matter is Made up of Chemical Energy..
Answer:
[tex]\huge\boxed{\sf Chemical}[/tex]
Explanation:
Matter is made up of atoms. Atoms contain chemical bonds which hold up the atoms together. These chemical bonds store chemical energy in themselves. Hence Matter is made up of chemical energy and heat energy.
Light energy have no relation with matter. Remember, Light is not a matter and matter is not light.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807why are sound waves not used to communicate between objects in space?
Answer:
Because there's nothing in space for sound to travel trough
Pls help plssssssdsss
Answer:
i do k12 too!
Explanation:
lol
What mass (in grams) of silver contains the same number of atoms as 5.59 grams of sulfur?
Answer:
18.84 g of silver.
Explanation:
We'll begin by calculating the number atoms present in 5.59 g of sulphur. This can be obtained as follow:
From Avogadro's hypothesis,
1 mole of sulphur contains 6.02×10²³ atoms.
1 mole of sulphur = 32 g
Thus,
32 g of sulphur contains 6.02×10²³ atoms.
Therefore, 5.59 g of sulphur will contain = (5.59 × 6.02×10²³) / 32 = 1.05×10²³ atoms.
From the calculations made above, 5.59 g of sulphur contains 1.05×10²³ atoms.
Finally, we shall determine the mass of silver that contains 1.05×10²³ atoms.
This is illustrated below:
1 mole of silver = 6.02×10²³ atoms.
1 mole of silver = 108 g
108 g of silver contains 6.02×10²³ atoms.
Therefore, Xg of silver will contain 1.05×10²³ atoms i.e
Xg of silver = (108 × 1.05×10²³)/6.02×10²³
Xg of silver = 18.84 g
Thus, 18.84 g of silver contains the same number of atoms (i.e 1.05×10²³ atoms) as 5.59 g of sulfur
What is the name of the tides when the moon
is in 1st and 3rd quarter?
All living things are made up of one or more
O A) Chloroplasts
OB) Prokaryotes
OC) cells
OD) Units
Answer:
c cells
Explanation:
learned that in 7th grade
for the following equation to be bal
Answer:
What's the rest of the question
Explanation:
A student is looking for an element to react with lithium to create the most vigorous reaction possible. To which direction on the periodic table should the student look?
A. Lower left
B. Upper left
C. Lower right
D. Upper right
Answer:
D. Upper right
Explanation:
The position the student should look for such element is in the upper right corner before the noble gases.
Specifically, the group of halogens will react vigorously with lithium.
Lithium is an electropositive metal. To attain stability, it must lose an electron. The group of halogens are a series of highly electronegative elements. They have 7 electrons in their outer shell and requires just one more to complete their octet. Therefore, they combine violently with halogensHalogens are found in the upper right corner on the periodic table.Answer:
D. Upper right
Explanation:
I had the exact same question
A compound is found to consist of 34.5% sodium, 16.4% boron, and 48.6% oxygen. What is the empirical formula?
A. NaBO3
B. NaBO2
C. Na2B4O7
D. Na3BO3
Answer: The empirical formula is [tex]NaBO_2[/tex]
Explanation:
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given:
Mass of Na= 34.5 g
Mass of B= 16.4 g
Mass of O = 48.6 g
Step 1 : convert given masses into moles.
Moles of Na =[tex]\frac{\text{ given mass of Na}}{\text{ molar mass of Na}}= \frac{34.5g}{23g/mole}=1.5moles[/tex]
Moles of B =[tex]\frac{\text{ given mass of B}}{\text{ molar mass of B}}= \frac{16.4g}{11g/mole}=1.5moles[/tex]
Moles of O =[tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{48.6g}{16g/mole}=3moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For Na = [tex]\frac{1.5}{1.5}=1[/tex]
For B = [tex]\frac{1.5}{1.5}=1[/tex]
For O =[tex]\frac{3}{1.5}=2[/tex]
The ratio of Na: B: O= 1: 1: 2
Hence the empirical formula is [tex]NaBO_2[/tex]
At what velocity (m/s) must a 19.9 g object be moving in order to possess a kinetic energy of 1.0 J
Answer:
Explanation:
T
Answer:
for this one you would have to divide 19.9g by the kinetic energy 1.0 and you would get your answer.
Explanation:if you would give me brainiest that would help a lot :)
How is static electricity transferred during charging by conduction?
Answer:
Static electricity is transferred during charging by conduction when electrons from a charged from one object to another object by direct contact. For example, on a carpet, charges are transferred from a person's feet to the rest of his/her body.
A sample of radioactive material starts with 80 grams. After 3 half-lives have passed, how much radioactive sample remains?
Answer:
After 3 half lives 10 g of radio active material left.
Explanation:
Given data:
Total amount of radio active material = 80 g
Amount left after 3 half lives = ?
Solution:
At time zero = 80 g
At first half life = 80 g/2 = 40 g
At 2nd half life = 40 g/2 = 20 g
At 3rd half life = 20 g/2 = 10 g
Thus, after 3 half lives 10 g of radio active material left.
Cl2 +
NaBr
-
NaCl +
Br2
Answer:
hope this helps :)
Explanation:
Cl2 + NaBr = NaCl + Br2
NaCl + Br2 = NaBr + Cl2
Which material most likely gets the warmest when placed in the Sun?
Yellow plastic
White plastic
Orange plastic
Black plastic
o
Exit tetton
R03:21
Answer:
Black plastic
Explanation:
The color black absorbs more heat than any other color.
Answer:
plastic
Explanation:
where do the non metals located on the periodic table
A metal ion uses d2sp3 orbitals when forming a complex. What is its coordination number and the shape of the complex?
Answer:
Octahedral
Explanation:
The idea of hybridization is a valence bond concept introduced by Linus Pauling and soon became an important explanation for the structure of molecules even in coordination chemistry.
Hybridization involves the mixing of orbitals of appropriate energy to form a new set of orbitals that are more suitable for bonding with ligands.
When one s, two d and three p orbitals are hybridized in complex formation, octahedral complexes are formed.
someone please help me answer this i’m struggling and i will give branliest
Answer:
bottom right corner with arrows going up
A sample of an unknown compound is vaporized at 150.°C . The gas produced has a volume of 960.mL at a pressure of 1.00atm , and it weighs 0.941g . Assuming the gas behaves as an ideal gas under these conditions, calculate the molar mass of the compound. Round your answer to 3 significant digits.
Answer:
the molar mass of the compound is 34.0 g /mol
Explanation:
The computation of the molar mass of the compound is as follows:
As we know that
PV = nRT
n = mass ÷ MW
PV = mRT ÷ MW
It can be rearrange as
MW = mRT ÷ (PV)
MW = (0.941)(0.082)(150 + 273) ÷ (1 × 0.96)
= 33.99g/mol
= 34.0 g /mol
Hence, the molar mass of the compound is 34.0 g /mol
A solution has a pH of 11.75. Calculate the [H:0*] of the solution
The [H₃0⁺] of the solution : 1.778 x 10⁻¹² M
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.
pH = - log [H⁺]
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.
pH of solution = 11.75
the [H₃0⁺] of the solution :
[tex]\tt pH=-log[H_3O^+]\\\\11.75=-log[H_3O^+]\\\\(H_3O^+]=10^{-11.75}=1.778\times 10^{-12}[/tex]
Work shown would be appreciated ❤️
20 points!!!!
Answer:
35.453 amu.
Explanation:
From the question given above, the following data were obtained:
Isotope A (Cl–35):
Abundance (A%) = 75.77%
Mass of A = 34.969 amu
Isotope B (Cl–37):
Abundance (B%) = 24.23%
Mass of B = 36.966 amu
AVERAGE atomic mass of Cl =?
The average atomic mass of Cl can be obtained as follow:
Average = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]
Average = [(34.969 × 75.77)/100] + [(36.966 × 24.23)/100]
Average = 26.496 + 8.957
Average atomic mass of Cl = 35.453 amu.
#1...TRUE/FALSE, the best way to write a conclusion is to use the RERUN method.?
#2...TRUE/FALSE, an example of an inference is “I saw it rain today.”?
#3...TRUE/FALSE, an example of a quantitative observation is “That is a red doll.”?
#4...TRUE/FALSE, a scientific hypothesis is written as “If [independent variable] Then [dependent variable.]”?
please answer all of them
Which of the following is a pure substance?
pizza
pizza
salt (NaCl)
salt (NaCl)
air
air
sweet tea
sweet tea
Answer:
salt (NaCl)
Explanation:
Pure substance is defined as the substance that consist of a single type of material and does not contain contaminants. A pure substance has uniform composition throughout the process.
sodium chloride (NaCl) also known as table salt is a pure substance because it has a uniform and definite composition that is 1:1 ratio of sodium and chloride ions.
Hence, the correct answer is "salt (NaCl)".
