Atom X contains nine protons and seven neutrons. Atom Z contains nine protons and eight neutrons. Which of the following statements correctly describes the two atoms? (AKS 1a/DOK 1)
A.
They have the same mass number
B.
They are radioactive
C.
They are isotopes
D.
They are atoms of different elements
Calculate the number of molecules in
3.7 x 10-2 Liters of oxygen gas at STP. Round your answer to the nearest whole number.
9.9 × 10²⁰ molecules O₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc. STP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
3.7 × 10⁻² L O₂ at STP
Step 2: Identify Conversions
[STP] 22.4 L/mol
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 3.7 \cdot 10^{-2} \ L \ O_2(\frac{1 \ mol \ O_2}{22.4 \ L \ O_2 \ at \ STP})(\frac{6.022 \cdot 10^{23} \ molecules \ O_2}{1 \ mol \ O_2})[/tex]Multiply/Divide: [tex]\displaystyle 9.94705 \cdot 10^{20} \ molecules \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
9.94705 × 10²⁰ molecules O₂ ≈ 9.9 × 10²⁰ molecules O₂
ASAP!! How many moles are in 125 g of H2SO4
Answer:
1.276 moles
Explanation:
molar mass of H2SO4 = 2(1)+(32)+4(16) = 98 g
So, there are (125g)(1 mol/98g) = 1.276 moles
1.276 moles are in 125 g of H[tex]_2[/tex]SO[tex]_4[/tex]. A mole is indeed a unit that enables us to correlate the mass of a material with its components.
What is mole?It is defined as the amount of any material that has the same number of basic units as there are in a precisely measured sample of 12C that weighs 12 g. Latin's word for pile, stack, or assemblage is "mole." The number of entities that make up a mole was discovered via experimentation to be 6.022 X 1023.
A mole is indeed a unit that enables us to correlate the mass of a material with its components. The total of the masses of all the atoms that make up one mole of a molecule, expressed in grams, is what is known also as molecular mass or molar mass. A substance's molar mass may be calculated by multiplying its given mass by its g/mol density.
molar mass of H[tex]_2[/tex]SO[tex]_4[/tex] = 2(1)+(32)+4(16)
= 98 g
mole= (125g)(1 mol/98g)
= 1.276 moles
Therefore, 1.276 moles are in 125 g of H[tex]_2[/tex]SO[tex]_4[/tex].
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In an ionic bond, how does a sulfur atom achieve an octet of electrons?
By gaining 2 electrons
By gaining 6 electrons
By losing 2 electrons
By losing 6 electrons
What can scientists learn by studying fossils? I HAVE ANSWER
It is all of them.
how the Earth's climate has changed over time
how species have changed over time
the appearance of an organism and its structures
how the Earth's surface has changed over time
Answer:
dweyflgyegfuyegfyegrygeyrgyr8ogeyurkgevyrujfryujftewy
Explanation:
jk b or e
How many significant figures are there in 8.280?
Answer:
number of significant figures-4
number of decimals-3
According to the passage, how does conserving energy helps combat climate change?
A
It turns off the lights automatically.
B
It reduces the need for fossil fuels.
C
It recycles old materials into new ones.
D
It releases greenhouse gasses into the air.
Answer:
B it reduces the need for fossil fuels
Explanation:
I got the answer wrong and it showed B was the right one
A chemical reaction produces 138 mol of HBr gas. What volume will that gas occupy at STP?
3.09E3 L
3.09E4L
22.4L
3.25E2L
The chemical reaction at STP results in a volume of HBr gas that is roughly 3.09E3 L.
An example of a chemical reactionIn a chemical reaction, reactants undergo a chemical reaction and transform into products through a chemical process. For instance, when humans breathe in oxygen, it combines with glucose to create carbon dioxide, water, and energy.
The temperature is 273.15 K and the pressure is 1 atm at STP (standard temperature and pressure).
The ideal gas law can be rearranged to account for V:
V = (nRT) / P
Substituting the values we are aware of:
n = 138 mol
R = 0.0821 L·atm/(mol·K)
T = 273.15 K
P = 1 atm
V = (138 mol * 0.0821 L·atm/(mol·K) * 273.15 K) / 1 atm
V = 3,092.1 L
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WS Percent yield don’t understand how to do would appreciate the help
Answer:
1. Theoretical yield of NaOH is 22.72 g
2. Percentage yield of NaOH = 22.14%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
NaHCO₃ —> NaOH + CO₂
From the balanced equation above,,
1 mole of NaHCO₃ decomposed to produce 1 mole (i.e 40 g) of NaOH and 1 mole (i.e 44.01 g) of CO₂.
Next, we shall determine the number of mole of NaHCO₃ that will decompose to produce 25 g of CO₂. This can be obtained as follow:
From the balanced equation above,,
1 mole of NaHCO₃ decomposed to produce 44.01 g of CO₂.
Therefore, Xmol of NaHCO₃ will decompose to 25 g of CO₂ i.e
Xmol of NaHCO₃ = 25 / 44.01
Xmol of NaHCO₃ = 0.568 mole
1. Determination of the theoretical yield of NaOH.
From the balanced equation above,,
1 mole of NaHCO₃ decomposed to produce 40 g of NaOH.
Therefore, 0.568 mole of NaHCO₃ will decompose to produce = 0.568 × 40 = 22.72 g of NaOH.
Thus, the theoretical yield of NaOH is 22.72 g
2. Determination of the percentage yield of NaOH.
Theoretical yield of NaOH = 22.72 g
Actual yield of NaOH = 5.03 g
Percentage yield of NaOH =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 5.03 / 22.72 × 100
Percentage yield of NaOH = 22.14%
Most caves form in: *
O Igneous rock
O Compacted soil
O Limestone
Sandstone
How many electrons does potassium have in its outside electron shell?
Answer:
Potassium (K) is of atomic number 19 and has only 1 electron in the outermost shell
And this is because of the octet rule of chemistry followed while determining the number of electrons in each shell.
According to the octet rule, there can only be a maximum of 8 electrons in the outer shell of an atom, So when 'L' shell of K is filled with 8 electrons to accommodate the 19th electron a new shell will be created
Writing Prompt/Open-Ended Question
What are limiting reactants? How can you predict how much of a product you will create if you know how much of a reactant you used?
Answer:
If you are given a chemical equation and specific amounts for each reactant in grams, you have to follow these steps, in order, to determine how much product can possilby be made:
1. Convert each reactant into moles of the product.
2. Determine which reactant is the limiting reactant.
3. Convert the moles of product, from the limiting reactant, to grams.
Explanation:
PLZ help me with this question
Answer:
Mean: 350
Median: 300
Range: 650
Mode: 300
Explanation:
Mean: 800+300+150+300+200= 1750, 1750 divided by 5 = 350
You add up all the numbers then you divide it by the TOTAL NUMBER of NUMBERS to find the mean.
Median: (150, 200, 300, 300, 800)
To find Median put the numbers in order from greatest to least then you choose the middle number.
Range: Range is the distance from the smallest number to the largest the way to solve this is (Highest number) - (lowest number). In your case its 800-150 which equals 650
Mode: The mode is the value that appears most frequently in a data set.
Brainliest?
How many chromosomes should be in each cell labeled with an X? A. 32 B. 16 C. 8 D. 4
Answer:
B.16 B.16 B.16
Explanation:
B.16 B.16 B.16 B.16 B.16Find the moles in 0.0023 of Co, at STP:
How many moles of carbon tetrabromide are present in 5. 27x10`22 molecules of the compound
Answer: 0.094 mole
Explanation: same answer for any molecule, actually.
6.02214076*10^23 per mole
5.7*10^22 = 0.094 mole
What is the molarity of a solution that has 2.52 grams of NaCO3 dissolved to
make 0.125 Liters of solution?
Answer:
Explanation:
2.52g/ 0.125L= 20.16M
How many particles are in 1.43 g of a compound with a molar mass of 233? (No molar mass calculation needed) (show work plz)
Answer:
Explanation:
mol = given mols / molar mass
given mass = 1.43 grams
molar mass = 233
mols = 1.43 / 233 = 0.00614
1 mol contains 6.02 * 10^23 particles
0.00614 moles = x Cross multiply
1*x = 0.00614 * 6.02*10^23
x = 3,68 * 10^21 particles.
Which of the following statement is true how fossil records can produce incomplete evidence of organisms that lived on Earth?
Small plants and animals found on Earth were not fossilized.
Not all organisms that lived on Earth have been fossilized.
Large plants and animals found on Earth were not fossilized.
There are fossils that we cannot identify.
Answer
i think b
they making me put 20 characters so dont mind what you reading lol
An atom of carbon contains 6 total electrons. How many of these electrons are in s orbitals?
1
2
4
6
Answer:
4
Explanation:
total electrons = 6
electronic configuration = 1s^2, 2s^2, 2p^6
so in s orbital there are 4 electrons.
Hope it helps you (｡◕‿◕｡)
Decide which element probably forms a compound with chlorine that has a chemical formula most and least similar to the chemical formula of the compound formed by chlorine and rubidium. Comparing chemical formula of compound formed with chlorine: phosphorus beryllium magnesium lithium most similar to rubidium least similar to rubidium
Answer:
Most similar - Lithium
Least similar - Phosphorus
Explanation:
Rubidium is an element in group 1A of the periodic table. It is a metal and forms an ionic compound with chlorine. The formula of the compound is RbCl.
If we look at the options, Lithium is also a group 1A element and forms an ionic compound with chlorine having the formula LiCl which is very much similar to RbCl chemically.
Phosphorus is a nonmetal. Its compounds with chlorine, PCl3 and PCl5 are covalent and does not resemble RbCl in any way.
The pH of a solution is 3.81. What is the OH concentration in the solution?
Answer:
6.46 × 10⁻¹¹ M
Explanation:
Step 1: Given data
pH of the solution: 3.81
Step 2: Calculate the pOH of the solution
We will use the following expression.
pH + pOH = 14.00
pOH = 14.00 - pH = 14.00 - 3.81 = 10.19
Step 3: Calculate the concentration of OH⁻ ions
We will use the definition of pOH.
pOH = -log [OH⁻]
[OH⁻] = antilog -pOH = antilog -10.19 = 6.46 × 10⁻¹¹ M
a phosphorus ion with a charge of -2 has ____ protons ____ neutrons,and _____ electrons
The number of protons of an atom is always equal to the atomic number of the atom's element. In this case, we can assume that a phosphorus ion is simply an atom of phosphorus that is an ion, i.e., an atom with a nonzero electric charge. To refresh, there are three key subatomic particles that make up an atom: protons (which have a positive charge), neutrons (which have no electric charge), and electrons (which have a negative charge). Protons and neutrons are found bound to each other in the nucleus (an exception would be a neutral hydrogen, ¹H, atom, whose nucleus comprises only a single proton and no neutrons).
The atomic number of phosphorus is 15. Therefore, the phosphorus ion has 15 protons.
The number of neutrons in a phosphorus atom can be calculated by subtracting the atomic number from the atomic weight. The atomic weight of phosphorus is approximately 30.974 amu (the decimals come from the fact that this value is a weighted average of the masses of naturally-occurring isotopes of phosphorus). For our purposes, we can round our atomic weight to 31, which would reflect the number of protons and neutrons in a phosphorus atom. Subtracting our 15 protons from 31 gives us 16 neutrons. Since neutrons have no electric charge, their number would be the same in both a neutral atom and an ion of a particular isotope of phosphorus. Since we're presumably working with ³¹P (which is by far the most abundant isotope), we can safely say that the phosphorus ion has 16 neutrons.
Recall that protons have a positive charge, and we've just reiterated that neutrons have no electric charge. If all that made up an atom were protons and neutrons, the atom would have a net positive charge due to the protons. A neutral atom of an element, by definition, has no net charge because of the negatively-charged electrons surrounding the positively-charged nucleus. It follows, then, that in a neutral atom, the number of electrons equals the number of protons; so, in a neutral phosphorus atom, there would be 15 protons, 16 neutrons, and 15 electrons. The 15 positively-charged protons would neutralize the 15 negatively-charged electrons, resulting in a net atomic charge of 0.
In our phosphorus ion, we have a net charge of -2. That means that, given a nucleus with 15 positively-charged protons, we have an imbalance of 2 more negative charges. 15 electrons are needed to maintain an electrically neutral phosphorus atom; for each electron that is removed, the atom gains a positive charge, and for each electron that is added, the atom gains a negative charge. Since we have a -2 charge in the phosphorus ion, there must be 2 electrons in addition to the 15 electrons found in a neutral phosphorus atom, or 17 electrons in total. Therefore, the phosphorus ion has 17 electrons.
Note: A positively-charged ion is also called a cation, and a negatively charged ion is also called an anion. The charge of an ion has the general form Xⁿ⁺ or Xⁿ⁻, where X is the chemical species (such as an element), n is the magnitude of the charge, and the + or - respective denote a net positive or negative charge. In this case, one could represent the phosphorus anion as P²⁻.
A phosphorus ion with a charge of -2 has 15 protons, 16 neutrons, and 18 electrons.
The atomic number of phosphorus is 15, which means it naturally has 15 protons in its nucleus. Since the ion has a charge of -2, it means it has gained two extra electrons.
The number of protons remains the same in an ion, so it still has 15 protons. However, the number of electrons changes to accommodate the charge. The ion possesses 15 protons and 17 electrons because it has a -2 charge.
To calculate neutrons, subtract 15 from phosphorous' mass number. The neutron count for phosphorus is 31 - 15 = 16. Thus, a -2 phosphorus ion contains 15 protons, 16 neutrons, and 18 electrons.
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Carbon is the most abundant element in the universe.
O True
O False
Answer:
Carbon is not only the most abundant element on Earth; it is believed to be the most abundant element in the universe. Each of carbon's three valence electrons shares a bond with another atom. Single bonds between carbon atoms are typically shorter than double bonds between carbon atoms.
Explanation:
Answer:
False
Explanation:
what is the highest energy level of an atom with 37 electrons
Answer:
rubidium is your answer for this question
n a volumetric analysis experiment, a solution of sodium oxalate (Na 2C 2O 4) in acidic solution is titrated with a solution of potassium permanganate (KMnO 4) according to the following balanced chemical equation: 2KMnO4(aq) + 8H2SO4(aq) + 5Na2C2O4(aq) → 2MnSO4(aq) + 8H2O(l) + 10CO2(g) + 5Na2SO4(aq) + K2SO4(aq) It required 40.0 mL of 0.0335 M KMnO4 to reach the endpoint. What mass of Na2C2O4 was present initially?
Answer:
mNa₂C₂O₄ = 0.4489 g
Explanation:
This is a problem of stechiometry. in this case, we need to find the mole ratio between the permanganate solution and the oxalate. This can be seen in the balanced reaction which is the following:
2KMnO₄ + 8H₂SO₄ + 5Na₂C₂O₄---> 2MnSO₄ + 8H₂O + 10CO₂ + 5Na₂SO₄ + K₂SO₄
According to this balanced reaction, we have a mole ratio of 2:5 between permanganate and oxalate, so, the first thing to do here is calculate the moles of the permanganate needed to reach the endpoint of this titration:
n = M * V
Replacing we have:
nKMnO₄ = 0.0335 mol/L * 0.040 L = 0.00134 moles
With these moles, and the above mole ratio, we can determine the moles of the oxalate:
2 moles KMnO₄ -------> 5 moles Na₂C₂O₄
0.00134 moles ---------> X
X = 0.00134 * 5 / 2
nNa₂C₂O₄ = 0.00335 moles
Finally, with the molecular mass of Na₂C₂O₄, we can determine the mass of the oxalate:
Molecular weights:
Na: 23 g/mol; C: 12 g/mol; O: 16 g/mol
MMNa₂C₂O₄ = (23*2) + (2*12) + (4*16) = 134 g/mol
mNa₂C₂O₄ = nNa₂C₂O₄ * MM
mNa₂C₂O₄ = 0.00335 * 134
mNa₂C₂O₄ = 0.4489 gHope this helps
Please explain how to do this one !! Which of the following ionic solids would have the largest lattice energy?
CaBr2
NaF
CsI
SrO
BaSO4
Answer:
I think it's Csl
I don't really know
but follow me and heart this
How many atoms of which elements are represented by the following formula?
H3PO4
i have understood that the meaning of life is
I have understood that the meaning of life is to have a vision and live a purposeful life.
Living a meaningful life is concerned about the essence of waking up everyday and having something meaningful that you're doing or engaging yourself into what you have vision about.
Life is good and lively when you have a vision, this vision is drive by a passion for a particular thing. When you're visionary, you will be happy every day and it is visionaries that change the world positively.
Over an extended period of time, this vision will be brought into life where people can benefit from it. Here, is where purpose comes in.
When you're able to impact positively into another people's life and make their life easier, you're living a purposeful life.
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Form hypothesis: Which factor(s) do you think determine whether the car breaks the egg?
The mass of the car only _____
The kinetic energy of the car ____
The speed of the car only ___
The momentum of the car ___
(GIZMOS)