Question 1 (2 points)
What is the mass in mg of 9.3 x 1016 lead atoms? Give answer with correct
significant figures and units.
Answer:
the answer would be 9,448.8
The mass of 9.3 × 10¹⁶ lead atoms is equal to 0.032 mg.
What is Avogadro's number?Avogadro’s number represents the number of entities in one mole of any substance. Generally, these units can be molecules, atoms, ions, electrons, or protons, depending upon the type of chemical reaction or reactant and product.
The value of Avogadro’s constant is approximately equal to 6.022 × 10²³ mol⁻¹.
Given, the number of atoms of the lead = 9.3 × 10¹⁶
The atomic mass of the lead = 207.2 g/mol
So 6.022 × 10²³ atoms of lead have mass = 207.2g
Then 9.3 × 10¹⁶ lead atoms will have mass [tex]=\frac{207.2\times 9.3\times 10^{23}}{ 6.022\times 10^{23}}[/tex] = 31.998 ×10⁻⁷g
As we know, 1 gram = 1000 mg
The mass of the 9.3 × 10¹⁶ lead atoms = 31.998 ×10⁻⁴ mg = 0.0032 mg
Therefore, the mass of 9.3 × 10¹⁶ lead atoms is 0.032 mg.
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12 and 24
a. GCF
b. LCM
a.12= 2^2*3
24= 2^3*3
GCF= smallest power of each common factor
GCF= 2^2*3
GCF= 12
b. 12= 2^2*3
24= 2^3*3
LCM = greatest power of each factor involved
LCM= 2^3*3
LCM= 24
What is the final concentration when 5 ml of a 2.5M copper sulphate solution is diluted to 750 ml?
Answer: The final concentration when 5 ml of a 2.5M copper sulphate solution is diluted to 750 ml is 0.017 M
Explanation:
According to the dilution law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of stock [tex]CuSO_4[/tex] solution = 2.5 M
[tex]V_1[/tex] = volume of stock [tex]CuSO_4[/tex]solution = 5 ml
[tex]M_1[/tex] = molarity of diluted [tex]CuSO_4[/tex] solution = ?
[tex]V_1[/tex] = volume of diluted [tex]CuSO_4[/tex] solution = 750 ml
Putting in the values we get:
[tex]2.5\times 5=M_2\times 750[/tex]
[tex]M_2=0.017[/tex]
Therefore the final concentration when 5 ml of a 2.5M copper sulphate solution is diluted to 750 ml is 0.017 M
Complete the table with the mass number, number of protons, number of neutrons, and number of electrons for the elements shown.
Answer:
Explanation:
The Proton number for flourine will be 9
Then the mass number which will be protons+ neutrons will be 19
Argon which has a mass number of 40
to find the proton number of argon it will be 40-22=18
then the electron number will just be the same as proton number
then calcium the proton will be the same as electron so it will be 20
then neutrons will be mass number -proton number
which is 21
hope this helped
and pretty cool you use a mac
please help I really need this
Answer:
You eat a hamburger and breathe in oxygen.
Oxygen goes immediately from your lungs to blood vessels to cells.
Food molecules in the hamburger are broken down into glucose in the digestive system.
Explanation:
in terms of electrons, what is the difference between a covalent and ionic bond
Answer:
An ionic bond essentially donates an electron to the other atom participating in the bond, while electrons in a covalent bond are shared equally between the atoms. Ionic bonds form between a metal and a nonmetal. Covalent bonds form between two nonmetals
What property of water is primary for living organisms? (SC.6.E.7.4) *
It is odorless.
It does not conduct electricity.
It is tasteless
It is liquid at most temperatures on Earth.
Answer:
It is liquid at most temperatures on Earth.
6.00 moles of sodium perchlorate contains the same number of atoms as __________. 6.00 moles of sodium perchlorate contains the same number of atoms as __________. 6.00 moles of sodium permanganate 6.00 moles of strontium oxide 6.00 moles of sodium cyanide 6.00 moles of lithium phosphate 6.00 moles of sodium nitrite
Answer:
6.00 moles of sodium permanganate
Explanation:
Let us attempt to count the number of atoms present in sodium perchlorate. The formula of the compound is NaClO4
Sodium atoms - 1
Chlorine atoms - 1
Oxygen atoms -4
Total number of atoms = 6
Among the options, only KMnO4 also has six atoms. One atom of potassium, one atom of manganese and four atoms of oxygen.
6.00 moles of sodium perchlorate contains the same number of atoms as: A. 6.00 moles of sodium permanganate.
How to calculate the number of atoms.First of all, we would determine the chemical formula and the number of atoms contained in each chemical compound as follows:
For sodium perchlorate:
Sodium perchlorate = [tex]NaClO_4[/tex]
[tex]NaClO_4[/tex] = [tex]1+1+2[/tex] = 6 atoms.
For sodium permanganate:
Sodium permanganate = [tex]KMnO_4[/tex]
[tex]KMnO_4[/tex] = [tex]1+1+2[/tex] = 6 atoms.
For strontium oxide:
Strontium oxide = [tex]SrO[/tex]
[tex]SrO[/tex] = [tex]1+1[/tex] = 2 atoms.
In conclusion, we can deduce that 6.00 moles of sodium perchlorate contains the same number of atoms as 6.00 moles of sodium permanganate.
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how do I find the slope of this graph? Is it even possible?
Answer:
Not exactly But you can take the slope of the curved portion and the slope of the flatline.
It wont do you much good since your working for absorbance but if you ever see something like a temperature change you can use the slope(s) to find freezing points/melting
Explanation:
If you need to submit a slope you could use a best fit which is just point to point or you could break it up like i mentioned
Can someone help me over here? I need an negative charge and also another thing is that in a question it asked me to use something that would represent an ion. I’m not sure on what to choose either Hydrogen or Helium but just please send help.
Answer:
You could use a hydrogen anion which has 2 electrons.
Explanation:
An ion is an atom or molecule with a net electric charge because it has more or less electrons compared to the original atom or molecule.
An anion is a negatively charged ion.
A cation is a positively charged ion.
Normally a hydrogen atom has one proton and one electron.
So a hydrogen anion (H-) means that it has one proton and two electrons, which means the positive charge will be +1 and the negative charge will be -2.
Ultimately, giving the entire molecule a net charge of -1 because -2+1 = -1.
(I hope this helps! I am not 100% sure what's the format of this question. Like is it interactive? online? Did you draw all those electrons on the diagram? or were they given? Are the numbers given as well? or did you type those in? So I just tried my best to give you something that might work.)
If 0.813 g of O3 reacts with 0.605 g of NO, how many grams of NO2 will be produced?
Answer:
0.74 g O
3
=
48
0.74
=0.0154 mol O
3
0.67 g NO=
30
0.67
=0.0223 mol NO
O
3
is the limiting reagent and NO is in excess =0.0223−0.0154=0.007 mol
Thus, O
3
taken =NO
2
formed =0.0154 mol NO
2
=0.0154×46 g NO
2
Explanation:
Kito puts his spoon into a helping of fresh, hot, mashed potatoes as shown in the figure. Which process takes place when the two objects come together
A. The temperature of the spoon increases, but its thermal energy does not change
B. Energy in the form of heat is transferred from the warmer mashed potatoes to the cooler spoon
C. The thermal energy of both the mashed potatoes and the spoon increases as energy in the form of heat is transferred between them
(please answer quickly, I don't want to fail this test due to being stuck on this one)
Answer:
B. is the answer
Explanation:
Energy in form of heat is transferred from the warmer mashed potatoes to the cooler spoon.
yo why do females have to be so heartless to a guy who really put they all in for her?
Answer:
ikr
Explanation:
♂️ it's really sad
Answer:
sometimes the female doesn't want to be hurt, or it could be from the last relationship she was in. maybe just maybe the female feels like you are using her for her body or just to use her. Sometimes females want to stop the heartache before it begins. Tbh we all have different reasons for it.
Explanation:
Answer the following questions
Answer:
silk are the answer of the question
4.) What is atomic number.
Answer: the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
Explanation:
Which name for an ionic compound is
incorrect?
Chromium(IID fluoride (for CrF3 )
Copper(ID) oxide (for Cuo)
Potassium(I bromide (for KBr)
Answer:
no se ingles todavía no aprendo a hablar inglés ya si estuvieran en español los respondia
HELP ASAP!!!
An ionic compound in the solid state has a defined, repeating arrangement of atoms, which is called
A) crystal lattice.
B) atomic structure.
C) electronic structure.
D) molecular structure.
bromine
+
calcium iodide ® calcium bromide + iodine
Answer:
Br2 + CaI2 = CaBr2 + I2
Explanation:
Disclaimer: Not sure what you're asking, however, I will provide you with the full balanced equation.
Br2 + CaI2 = CaBr2 + I2
Faries in the stolen child are significant because
Please help asap, brainliest to correct answer!!!!
Which of the following statements best defines the actual yield of a reaction?
Select one:
a. The amount of product measured after a reaction
b. The ratio of measured yield over theoretical yield
c. The ratio of measured yield over stoichiometric yield
Answer: A) The amount of product measured after a reaction
A statement which best defines the actual yield of a reaction is "The amount of product measured after a reaction" Hence, Option (A) is correct
What is yield of any reaction?Yield of any chemical reaction gives idea about the amount of product that is produced by the chemical reaction between reactants.
Actual yield gives idea about the how much yield of any product will be produced in the given chemical reaction by using the stoichiometry of the reaction.
Therefore, A statement which best defines the actual yield of a reaction is "The amount of product measured after a reaction" Hence, Option (A) is correct
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ammonia gas occupies a volume of 57.9 L at a pressure of 532.4atm. if the pressure were lowered to 256.8atm,what would the new volume be
Answer:
683838447745 anmmlllkkkkk
If you were to compare a cell to the human body, what organ in the body would have a similar responsibility to the cells nucleus?
calculate the ph of a solution with a [H 3 0+]=7.2×10-8 M
Answer:
pH = 7.14.
Explanation:
Hello there!
In this case, since the pH of a solution is computed via the negative logarithm of the concentration of hydrogen ions:
[tex]pH=-log([H_3O^+])[/tex]
Therefore, we plug in the given concentration to obtain:
[tex]pH=-log(7.2x10^{-8})\\\\pH=7.14[/tex]
Which is a nearly-neutral solution.
How many moles are contained in 7.88 x 10^24 atoms of Iron
Answer:
1.31 × 10^47
Explanation:
1 mol of Fe =
[tex]1 \: mol \: of \ fe = 6.02 \times 10 ^{23} \ \\ x \: mol \: offe \: = 7.88 \times {10}^{24} \\ \\ \\ so \: 7.88 \times {10}^{24} \div 6.02 \times {10}^{23} \\ \\ x = 1.31 \times {10}^{47} [/tex]
Moles of C2H6 in 3.75×10^23 molecules of C2 H6
Answer:
0.623 moles of C2H6
Explanation:
Divide by Avogadro's number (6.022x10^23)
Which is larger in A and B
Answer:
Here is the answer ⬆️⬆️⬆️⬆️⬆️
What does a branching tree diagram show?
A. The evolution in the size of organisms
B. The order in which specific traits may have evolved
C. The animal population in a specific time period
D. The rate of extinction of specific traits in living organisms
Answer:
B. The order in which specific traits may have evolved
Explanation:
1) How many moles of water does 6.02 x 1023 molecules
represent?
Answer:
1.00 mol
Explanation:
Step 1: Given data
Molecules of water: 6.02 × 10²³ molecules
Step 2: Calculate the number of moles corresponding to 6.02 × 10²³ molecules of water
In order to convert molecules to moles, we need a conversion factor. In this case, we will use Avogadro's number: there are 6.02 × 10²³ molecules in 1 mole of molecules.
6.02 × 10²³ molecules × 1 mol/6.02 × 10²³ molecules = 1.00 mol (we keep 3 significant figures)
Student was identifying the formula of 1 mole of unknown powder. When it was placed on a scale, it was reading 399.91 g/mol. Which of
the following compounds can it be?
A AI(NO3)3
B. C3H8
C. Fe2(SO4)3
D. CaCl2
Answer: The compound is [tex]Fe_2(SO_4)_3[/tex]
Explanation:
Molar mass is defined as the mass in grams of 1 mole of a substance.
S.I Unit of Molar mass is gram per mole and it is represented as g/mol.
A. 1 mole of [tex]Al(NO_3)_3[/tex] weighs = 26.98(1)+14.01(3)+15.99(9) =212.99 g/mol
B. 1 mole of [tex]C_3H_8[/tex] weighs = 12.01(3)+1.007(8) = 44.1 g/mol
C. 1 mole of [tex]Fe_2(SO_4)_3[/tex] weighs = 55.84(2)+32.06(3)+15.99(12) = 399.91 g/mol
D. 1 mole of [tex]CaCl_2[/tex] weighs = 40.07(1)+35.5(2)= 110.98 g/mol
Thus the compound is [tex]Fe_2(SO_4)_3[/tex]
Please do not ignore, I don’t know how to find the last part so can you please explain it to me? I’m having trouble with that
Answer:
Neutral
Explanation:
U need to count the number of protons and electrons and see which has more...
Here the atom is neutral cause the electrons and protons are equal and cancell each other out.
I hope im right!!
Answer:
To find the overall charge subtract electrons from protons
So in this example its 0
Explanation:
4 Protons
4 electrons
so basically
+4-4=0