Answer:
denser than freshwater due to the sodium chloride dissolved in it.
Explanation:
t. This means that a specific volume of salt water is heaver than the same volume of freshwater. ... While colder water is denser, when water freezes into ice, it becomes less dense and floats on the surface
given that R=0.0821 (L•atm) / (mol•K) how many moles must be in a 2L container at 1.8 atmospheres with a temperature of 270K
The number of mole in the container at 1.8 atm with a temperature of 270 K is 0.162 mole.
From the question given above, the following data were obtained:
Gas constant (R) = 0.0821 atm.L/Kmol
Volume (V) = 2 L
Pressure (P) = 1.8 atm
Temperature (T) = 270 K
Number of mole (n) =?Using the ideal gas equation, we can obtain the number of mole in the container as illustrated below:
PV = nRT1.8 × 2 = n × 0.0821 × 270
3.6 = n × 22.167
Divide both side by 22.167
n = 3.6 / 22.167
n = 0.162 moleTherefore, the number of mole in the container is 0.162 mole
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Please help me with this thank you so much !!
Answer:
C and D
Explanation:
The answer is C and D
what’s the chemical formula for zinc (lll) sulfide?
Answer:
ZnS
Explanation:
Answer:
the chemical formula for zinc iii is ZnS
Write an equation between the carbonate and the acid
Answer:
In general an acid reacts with a carbonate or hydrogen-carbonate to produce a salt, carbon dioxide gas and water.
True or False. Photosynthesis and cellular respiration are OPPOSITE
chemical reactions
Answer:
Cellular respiration and photosynthesis are direct opposite reactions. Energy from the sun enters a plant and is converted into glucose during photosynthesis. Some of the energy is used to make ATP in the mitochondria during cellular respiration, and some is lost to the environment as heat.
Based on the Lewis/electron dot representation
of the two atoms, predict the ratio of metal
cationic (+) atom to nonmetal anionic (-) atom in
the compound
•
Be•
••
•As•
•
A. 1:3
B. 2:1
C. 3:2
D. 1:1
Answer: I'm pretty sure the answer is 3:2
Explanation:
The first ionization energy, , of a sodium atom is 5.00×102 kJ/mol . What is the wavelength of light, in nanometers, that is just sufficient to ionize a sodium atom?
Answer:
2.40 × 10² nm.
Explanation:
We are given that the the first ionization of a sodium atom is 5.00 × 10² kJ/mol and we want to determine the wavelength of light (in nm) that is sufficient to ionize a sodium atom.
We will first find the ionization energy required for one sodium atom using molar conversions:
[tex]\displaystyle 1 \text{ atom Na} \cdot \frac{5.00 \times 10^2\text{ kJ}}{\text{mol Na}} \cdot \frac{1\text{ mol Na}}{6.02\times 10^{23} \text{ atom Na}} = 8.31 \times 10^{-22} \text{ kJ}[/tex]
From the formula:
[tex]\displaystyle E = hv[/tex]
Where h is Planck's constant, substitute and solve for frequency v:
[tex]\displaystyle \begin{aligned} \left(8.31 \times 10^{-22} \text{ kJ}\right) &= (6.626\times 10^{-34} \text{J$\cdot$s})\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right) v \\ \\ v & = 1.25\times 10^{15} \text{ s}^{-1}\end{aligned}[/tex]
From the relationship between frequency and wavelength, solve for wavelength:
[tex]\displaystyle \begin{aligned} c & = \lambda\nu \\ \\ \lambda & = \frac{c}{v} \\ \\ & = \frac{(3.00 \times 10^8 \text{ ms}^{-1})}{(1.25 \times 10^{15}\text{ s}^{-1})}\cdot \left( \frac{1\times 10^9\text{ nm}}{1 \text{ m}}\right)\\ \\ &=2.40\times 10^2 \text{ nm} \end{aligned}[/tex]
In conclusion, the wavelength of light necessary to ionize a sodium ion is about 2.40 × 10² nm.
Explain how the strongest type of intermolecular force in liquid HF arises
Answer:
The fairly positive hydrogen on one HF molecule will be attracted to one of these lone pairs on a nearby HF molecule. This is a hydrogen bond. Hydrogen bonds are attractions between a δ+ hydrogen on one molecule and a lone pair on a very electronegative atom (N, O or F) on another molecule.
Explanation:
You have 1024 grams of a radioactive element with a half life of 1 year. How much do you have left of it (in grams) after 6 years
We will be left with 16g after 6years
The half-life of radioactive isotopes refers to the amount of time it will take for half of the amount of the original isotope to decay.
it is calculated as
N(t)=N₀([tex]\frac{1}{2}[/tex])^(t/t₁/₂)
where,
N(t) = quantity of the substance remaining
N₀ = initial quantity of the substance
t= time elapsed
t₁/₂ = half life of the substance
Given that:
The initial quantity is 1024g,
The half-life is 1year,
6 years is the time elapsed.
We have that
N(t)=N₀([tex]\frac{1}{2}[/tex])^(t/t₁/₂)
N(t)=1024([tex]\frac{1}{2}[/tex])^(6/1)
N(t)=1024([tex]\frac{1}{2}[/tex])⁶
N(t)=1024 x 0.015625
N(t)=16g
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#4.
4. Use the atomic model above to answer the following questions: 1 pt for each blank
a. How many protons?
b. How many neutrons?
c. What is the name of this atom?
Answer:
A → 16 protons
B → 16 neutrons
C → Sulfur
Explanation:
Remember, in a neutral atom the amount of protons is the same as the number of electrons. In the picture provided, its shown that there are 16 electrons which means there are 16 protons. Finding the amount of neutrons will be more tricky. The valence electron count will allow us to find this. The valence electrons will allows us to determine where it is on the periodic table (So does atomic number). The valence electron count is 6. So, using the current information (6 valence electrons and atomic number of 16) we can look at the periodic table and pinpoint which element it is. As you look, you'll find that the element sulfur matches the information. Since the element is sulfur, and it has an atomic mass of 32, we can subtract the atomic number from the atomic mass to find the amount of neutrons.
32 - 16 = 16
Thus, the atom in the picture is sulfur with an atomic number of 16, atomic mass of 32, and an electron count of 6.
A gas sample has a volume of 1424 liters at STP. How many moles of gas are there in the sample?
Answer:
[tex]\boxed {\boxed {\sf 63.57 \ mol }}[/tex]
Explanation:
We are asked to find how many moles of gas are in a sample.
At standard temperature and pressure (STP), any gas has a molar mass of 22.4 liters per mole. This means 1 mole of every gas at STP has a volume of 22.4 liters.
We will convert using dimensional analysis. Set up a conversion factor using the molar mass.
[tex]\frac {22.4 \ L }{1 \ mol }[/tex]
We are converting 1424 liters of gas to moles, so we multiply the conversion factor by this value.
[tex]1424 \ L *\frac {22.4 \ L }{1 \ mol }[/tex]
Flip the ratio so the units of liters cancel.
[tex]1424 \ L *\frac {1 \ mol }{22.4 \ L }[/tex]
[tex]1424 *\frac {1 \ mol }{22.4 }[/tex]
[tex]\frac {1 424}{22.4 } \ mol[/tex]
[tex]63.5714286 \ mol[/tex]
The original value of volume (1424 L) has 4 significant figures, so our answer must have the same. For the number we found, that is the hundredth place. The 1 in the thousandth place tells us to leave the 7 in the hundredth place.
[tex]63.57 \ mol[/tex]
There are approximately 63.57 moles of gas in a sample of 1424 liters.
i have a question can someone answer these questions for me please?
What class of enzyme catalyzes addition of oxygen?
Answer:
The answer is Lyase
Explanation:
Any enzyme that catalyzes the addition or removal of the elements water (hydrogen, oxygen), ammonia (nitrogen, hydrogen), or carbon dioxide (carbon, oxygen) at double bonds, as defined in physiology. Decarboxylases, for example, remove carbon dioxide from amino acids, while dehydrases eliminate water.
PLEASE HELP ME!!
1)which pattern of inheritance controls the grow of beard in male humans?
2) A basketball player in the Philippine basketball association stands tall at 7'0. Which pattern of inheritance determines the expression of the height of an individual?
One way to limit deforestation is by
A. Practicing crop rotation
b. Increaseing soil fertilization
C. Increase of wood products
D. Using trees grown on tree farms
Thank you!
Answer:
the answer should be d I'm pretty sure.
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Answer:
question pls.............
Hydrogen bond is a strong dipole interaction between water and another molecule true or false want an ans
Answer:
it is true
Explanation:
that's the right answer
Answer: True. Hydrogen bonding is a dipole-dipole interaction and it is between water and another molecule.
ANY rock can become a new sedimentary rock when ________
A. sediments are compacted and compressed under pressure.
B. sediments are melted then cooled.
C. magma is compacted and compressed with pressure.
D. magma is melted and cooled.
Answer:
sediments are compacted and compressed under pressure
why is gold not magnetic
Gold (Au) in its bulk form, like the metal in a wedding ring, is not considered a magnetic material. ... This means that metallic gold has no unpaired electrons, and it does not display classical magnetism. Gold was one of the first metal known to man. Gold is most malleable and ductile of all metals.
Consider the unbalanced chemical equation:
H3PO4 (aq) + Ba(OH)2 (aq) → Ba3(PO4)2 (S) + H2O
A volume of 46.0 mL of aqueous Ba(OH)2 solution was required to
react completely with 0.685 g H3PO4 (molar mass = 98.0 g/mol) to
produce Ba3(PO4)2. Calculate the molar concentration of the
Ba(OH)2 solution.
A)0.552 M
B)0.228 M
C)0.403 M
D)0.328 M
E) 0.655 M
By balancing the equation, it is obtained that 2 moles or 196 g of H₃PO₄ is required to react with 3 moles or 514.02 g of Ba(OH)₂. Thus, 0.685 g of H₃PO₄ reacts with 1.796 g Ba(OH)₂. The molarity of 1.796 g of Ba(OH)₂ in 46 ml is 0.217 molar.
What is molarity?Molarity of a solution is the ratio of the number of moles of solute to the volume of solution in liters. Molarity is the common term used to represent the concentration of the solution.
The balanced equation of the given reaction is written as:
[tex]\rm 2 H_{3}PO_{4} + 3Ba(OH)_{2} \rightarrow Ba_{3}(PO_{4})_{2} + 6H_{2}O[/tex]
As per this reaction, 2 moles of H₃PO₄ reacts with 3 moles of Ba(OH)₂.
Molar mass of H₃PO₄ = 98 g/mol
2 moles = 2 × 98 = 196 g.
molar mass of Ba(OH)₂ = 171.3 g/mol
3 moles = 171.3 × 3 = 514.0 g.
The mass of Ba(OH)₂ produced from 0.685 g of H₃PO₄ is calculated as follows:
= (0.685 × 514 g) /196 g
= 1.796 g.
Number of moles of 1.796 g of Ba(OH)₂ = 1.796 g/ 171.3 g/mol = 0.010 mol
The volume of the solution is 46 ml or 0.046 L. Thus, molarity of the solution is = no.of moles/volume in L
= 0.010 moles/ 0.046 L
= 0.217 M.
Therefore, the molar concentration of Ba(OH)₂ is 0.217 M.
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Can someone help me with questions c,d , and number 16 for 10th grade chemistry
Answer:
i cant but ask awadtameem for help
Explanation:
Can a molecule that has absorbed infrared radiation subsequently emit a photon with a wavelength in the uv region as a result?
yes
no
molecules cannot absorb infrared.
It is not possible that a molecule that has absorbed infrared radiation subsequently emit a photon with a wavelength in the UV region as a result.
Both infrared rays and ultraviolet rays belong to the electromagnetic spectrum. However, the infrared rays are lower in energy than the ultraviolet rays. Hence, infrared rays have a longer wavelength than ultraviolet rays.
This implies that it is not possible that a molecule that has absorbed infrared radiation subsequently emit a photon with a wavelength in the UV region as a result.
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The relative atomic mass of sulfur is 32 and of oxygen it is 16. The compound shown below contains 80g of sulfur and 120g of oxygen. What is the value of x?
Answer: 32g of sulfur, S, is 1 molar mass
1 molar mass contains X particles (in this case, atoms)
32g of oxygen, O2, is 1 molar mass
1 molar mass contains X particles (in this case, molecules)
There are 2 oxygen atoms in each molecule of O2 gas
Therefore, there are 2X atoms of oxygen in 32g of oxygen gas.
Explanation: bcs yes
The value of x in the compound SOₓ is 3 . The compound is SO₃
The relative atomic mass of sulphur is given as 32
The relative atomic mass of oxygen is given as 16
The compound shown contains 80 g of sulphur and 120 g of oxygen.
The value of x can be calculated as follows:
molecular mass of S0ₓ = 32 + 16x
if 32 g of sulphur is in 32 + 16x of the of S0ₓ
80 g of sulphur is in 200 g of the compound
cross multiply
200(32) = 80(32 + 16x)
6400 = 2560 + 1280x
6400 - 2560 = 1280x
3840 = 1280x
x = 3840 / 1280
x = 3
Therefore, the compound is SO₃
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Aqueous NaOH was chosen as the solvent to crystallize benzoic acid. Why is this solvent a bad choice for the recrystallization
NaOH reacts with benzoic acid to form sodium benzoate therefore, aqueous NaOH is a bad choice for the recrystallization of benzoic acid.
Recrystallization is a process of obtaining a pure solute by dissolving a solute in a solvent at high temperature and cooling the solution rapidly so that the pure solute can crystallize out of solution.
It is important to note that the solute must not react with the solution from which it is to be recrystallized. Unfortunately, NaOH reacts with benzoic acid to form sodium benzoate therefore, aqueous NaOH is a bad choice for the recrystallization of benzoic acid.
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safety rules for using primus stove
Answer:
1. Never leave the gas cartridge in the stove when you’re not using it.
2. Always wait until the stove cools down before you remove the gas cartridge.
3. Always try to store gas cartridges and camping stoves in a dry place
4. Clean your stove each time you have used it because it needs to be clean in order to perform at its best.
Define kinetic energy and thermal energy
Answer:
Kinetic energy is the energy by ethicalness of article's movement while Thermal energy is the inner energy of an item because of the motor energy of its particles.
Explanation:
Answer:
Thermal energy:
Thermal energy is a type of energy that is formed by the vibration of atoms and molecules inside matter. The faster they vibrate, the more energy they contain. They also gain more heat.
Kinetic energy:
Kinetic energy is the mass/energy that is in moving objects. When an object speeds up, it gains more kinetic energy. All moving objects contain kinetic energy. The moving object gains energy due to its motion.
Note:
Sorry if this is a bad explanation but hopefully this helped!
8. When an object is submerged in water, the buoyant force
exerts pressure on all surfaces of the object
acts in the same direction as the force of gravity
displaces the fluid around the object
exerts an upward force on the object
Answer:
exerts an upward force on the objectExplanation:
As we know,
Buoyant force is that force produced by water in upward direction when any object is kept over it.♤ So, when an object is submerged in water the upward force of water that is buoyant force, acts on the object.At what temperature (in K) will 3.5 moles of gas occupy 2.7 L at 1.5 atm? HELP PLEASE!
3.5 moles of a gas will occupy 2.7 L at 1.5 atm at a temperature of 14.1K
IDEAL GAS LAW:
The temperature of a gas can be calculated using the ideal gas law equation:PV = nRT
Where;
P = pressure (atm)V = volume (L)n = number of moles (mol)R = gas law constant (0.0821 Latm/molK)T = temperature (K)According to this question, P = 1.5atm, V = 2.7L, n = 3.5moles, T = ?1.5 × 2.7 = 3.5 × 0.0821 × T4.05 = 0.28735TT = 4.05 ÷ 0.28735T = 14.1KTherefore, 3.5 moles of a gas will occupy 2.7 L at 1.5 atm at a temperature of 14.1KLearn more at: https://brainly.com/question/13821925?referrer=searchResults
Many plants that grow in shady areas have large leaves. This feature helps the plants gather more sunlight for photosynthesis. Which statement describes an example of evolution?
A. All plants pass the genes for large leaves to their offspring.
B. Plants with leaves of varying size sprout in gardens each year.
C. All plants have variation in their genes for leaf size.
D. Plants with large leaves have become common in rain forests.
Answer: D.Plants with large leaves have become common in rain forest
Explanation: I got this right on the test trust me
Answer:
D. Plants with large leaves have become common in rain forests
Explanation:
I got it correct. Be careful that sometimes the questions are in another order, so be guided by the sentence.
how does the arragenment of the electrons change as you move down the colums
Answer:
The number of electron shells is therefore the same across a period but increases when moving down a column.
Explanation:
