ASAP PLSSS!!!!! How many atoms of strontium are in a sample of 33.6 mol strontium?
1) 4.22 x 1023 atoms Sr
2) 4.22 x 1024 atoms Sr
3) 2.02 x 1025 atoms Sr
4) 2.02 x1023 atoms Sr
Answer:
33.6 mol of the atom strontium contains approximately
3) 2.02 × 10²⁵ atoms of strontium
Explanation:
The number of atoms in one mole of a substance is given by Avogadro's number number, [tex]N_A[/tex], which is presented as follows;
1 mole of a substance contains [tex]N_A[/tex] = 6.022 × 10²³ elementary particles
33.6 mol of a substance will contain 33.6 × 6.02214 × 10²³ elementary particles of the substance
Therefore;
33.6 mol of the atom strontium contains 33.6 × 6.02214 × 10²³ = 2.023439 × 10²⁵ atoms of strontium
33.6 mol of the atom strontium contains ≈ 2.02 × 10²⁵ atoms of Sr.
.The cell membrane acts like a filter allowing necessary materials in and waste out, while keeping the organelles and cytoplasm in. This means that a cell membrane is selectively
Answer: Permeable
Explanation:
The cell membrane is the outermost covering around the animal cells but it is also surrounded by the cell wall in the case of the plant cells. The cell membrane plays an important role in the cell that is it allows the entry of only certain substances like ions, molecules, atoms within the cell and only allows the exist of certain substances out of the cell. This is the selective permeability of the membrane. This process occurs through osmosis in which the desired molecules move from higher to lower concentration. Also it helps in maintaining the balance of nutrients and water within the cell. This helps in getting rid of the waste outside the cell. It provides the protection to the organelles and cytoplasm in the cell against the external injury caused by the external stressor outside the cell like water, pressure, pathogen, and others.
give an example of how an organism can use surface tension?
Answer: Examples of surface tension
Explanation:
Water striders use the high surface tension of water and long, hydrophobic legs to help them stay above water. Water striders use this surface tension to their advantage through their highly adapted legs and distributed weight.
Which of the following elements would have the greatest attraction for
electrons? *
Rb
sr
Cs
Ba
Answer:
Sr
Explanation:
because it's electronegativity is the highest.
how many valence electrons does C6H14O6 have?
chhfjhfhou huohfpgvvocoj ognf
electrons are transferred in forms of what
Answer:
ionic bonds
Explanation:
You and a friend are swimming at your grandparent's house one toasty
summer afternoon. You have music playing through the Bluetooth speaker
on the pool deck, but every time you go underwater, you can hear the
noise, but you cannot understand the words of the song. What would
explain this phenomenon? *
Sound waves travel faster in a gas than they do in a liquid, which is why you cannot
understand the words,
Sound waves travel faster in a liquid than a gas, our ears are just not designed to
translate the faster moving waves,
Sound waves cannot travel at all in a liquid, which is why you cannot understand the
words and it's a miracle you can even hear the music at all,
Sound waves travel at the same speed regardless of the medium; your grandfather is
turning the music on and off when you go underwater and the noise you hear is the
song stuck in your head,
Answer:
Sound waves travel faster in a liquid than a gas, our ears are just not designed to translate the faster moving waves.
Explanation:
Sound waves are mechanical waves which travel through vibrating the medium (the "stuff") they're traveling through. This means they actually move faster through materials that are more dense, and will move more quickly through liquid than gas, and a solid than a liquid. However, our ears are adapted to "translating" sound waves in air rather than water, so we don't understand the music well when the waves move through the water.
A similar idea explains why our vision is blurry underwater; light waves travel at a different speed (slower, not faster!) in water and our eyes perceive this change in speed as blurriness.
True or false: chewing your food is the first step of digestion. o True O False
Answer:
True
Explanation:
I searched it up lol
What number is pointing to the area where magma is less dense due to
heat?
Answer:
I think it's 2
Explanation:
The magma gets so hot, it floats up before cooling and sinking again
a tiny particle in the nucleus of an atom that is about the same size as a proton is a(n)
A. electron
B. neutron
C. solid
D. element
Answer:
b. neutron.
Explanation:
I hope this helps.
Answer:
B. Neutron
Explanation:
Neutrons are about the same size as protons. In addition, nuclei are made up of neutrons and protons. Electrons are located in the electron cloud, which is outside of the nucleus. Solids are hard matter, and an element is a substance that cannot be broken down any further.
Hope this helps!
It is more logical to believe that the complex life sustaining processes of the sun-Earth system were created because they Choose... on one another.
A. rely
B. orbit
C. breathe
D. spin
CH3OH can be synthesized by the reaction:
COg + 2 H2g– CH30Hg
What volume of CH3OH gas (in L) can be synthesized if 18.6 L of H2 gas completely reacts at STP conditions?
Answer:
55
Explanation:
What are the products we get out of this
reaction? (check picture)
Explanation:
two compounds because element is the very smallest part of any mixture
What are the major social and political barriers to using solar energy?
1 pts
Which of the following gases would you predict to be least ideal?
Cu
Explanation:
The gas that would behave least ideally is CO
If the sun output of solar radiation increased by 20% how would this impact the temperature of earth's mantle
Answer:
The temperature will not be affected directly
Explanation:
The solar radiation has a direct effect on the outer surface and inner part of the earth but an increase by 20% of the solar radiation will not cause the temperature of the Earth's mantle to increase because the factors that heat up the Earth's mantle are : Friction between core materials that sink into the center of the planet and Heat from decay of radioactive materials
How many milliliters of 0.100 M HClO4 solution are needed to neutralize 50.00 mL of 0.0832 M NaOH?
The milliliters of 0.100 M HClO4 solution are needed to neutralize 50.00 mL of 0.0832 M NaOH is 24.9 ml.
What is neutralization?Neutralization is defined as a chemical reaction in which an acid and a base quantitatively react with one another. Because it determines how acidic or basic a solution is, a solution's pH is crucial. The interaction of H+ ions and OH- ions produces water in a neutralization reaction, which occurs when an acid and a base react to form water and a salt.
Since the mole ratio of HClO4 to NaOH is 1:1, the moles of HClO4 are equal to 4.16 x 10-3 moles.
The moles of NaOH are equal to (0.0832 x 50) /1000.
Therefore, the volume of HClO4 is equal to the moles/molarity, which is 4.16 x 10-3mol/ 0.167 mol/L= 0.0249L.
This amount is then multiplied by 1000 to get ml: 0.0249 x 1000 = 24.9 ml.
Thus, the milliliters of 0.100 M HClO4 solution are needed to neutralize 50.00 mL of 0.0832 M NaOH is 24.9 ml.
To learn more about neutralization, refer to the link below:
https://brainly.com/question/27891712
#SPJ2
Eye Color
Genetic
O Environmental
O Both
Answer:
the first cause eye color is genetic
Why are halogens unreactive?
A. *Halogens need one to two more electrons to fill their outer shell.
B. Halogens need three to four more electrons to fill their outer shell.
C. D. Halogens have a full outer shell of valence electrons.
Answer: B) is the answer.
Explanation:
Which of the following is most likely a chemical reaction?
Group of answer choices
Two solid powders are combined and shaken. The substances form a mixture.
A solid is stirred into a liquid solution. The temperature of the solution decreases.
Three liquids are poured into a beaker and swirled. One of the liquids settles at the bottom.
A liquid is heated until it reaches its boiling point. Vapor is created.
Answer:
Two solid powders are combined and shaken. The substances form a mixture.
Which best describes a heterogeneous mixture? 0 A table salt and water O B. alcohol and water O C. oil and vinegar O D. hot tea and sugar
Answer:
oil and vinegar
the rest would mix well so you can't determine the individual components
Explanation:
Sodium bicarbonate (NaHCO3), also known as baking soda, is used to relieve heartburn, sour stomach, or acid indigestion by neutralizing excess stomach acid. When used for this purpose, it is said to belong to the group of medicines called antacids.
How many atoms are found in two molecules of sodium bicarbonate?
Answer:
NaHCO3 = No. of atoms in one molecule is 1 sodium + 1 Hydrogen + 1 carbon + 3 oxygens = 6 atoms per molecule.
We double it for two molecules, so 12 Molecules!
Explanation:
Hope i helped, Brainliest would be appreciated!
Have a nice day!
-Aadi x
The majority of Earth's energy comes from.
1) Deep ocean vents
2) Zone
3) Volcanoes
4) The sun
Mm 2mCOO 19. Calculate the hydrogen-ion concentration [H+] for the aqueous solution in which [OH-] is 1 x (3 points) 10-11 mol/L. Is this solution acididc, basic, or neutral? Show your work.
Answer: The hydrogen-ion concentration for the aqueous solution is [tex]10^{-3}mol/L[/tex] and solution is acidic.
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration and pOH is calculated by taking negative logarithm of hydroxyl ion concentration.
[tex]pOH=-\log [OH^-][/tex]
Putting in the values:
[tex]pOH=-\log[1\times 10^{-11}][/tex]
[tex]pOH=11[/tex]
[tex]pH+pOH=14[/tex]
\[tex]pH=14-11=3[/tex]
[tex]pH=-log[H^+][/tex]
[tex]3=-log[H^+][/tex]
[tex][H^+]=10^{-3}M[/tex]
As pH is less than 7, the solution is acidic.
help please! asap!
Which of the following experiments could you perform to investigate the effect temperature has on the volume of a gas? ( AKS 5b DOK 2)
A.
Measure the pressure of the air in a tire on a cold day, a warm day, and a hot day.
B.
Measure the volume of a balloon filled with room temperature air. Place the balloon in a freezer for an hour and then measure its volume again.
C.
Stretch a balloon over the top of a beaker filled with baking soda and vinegar and observe how the balloon changes volume.
D.
Inflate one balloon to a large volume and another balloon to a small volume. Measure the temperature of the air released from both balloons.
Answer:A
Explanation:
Answer:
m
Explanation:
When converting from grams to the must be used as a conversion factor
HELP 50 POINTS IF YOU DO IT RIGHT NOW
How much energy is released when 944.3 g of phosphoric acid is produced
P4O10(g) + 6H20(l) -- > 4H3PO4(aq)+424 kj
Answer:
1024.84 Kj
Explanation:
P₄o₁₀(g) + 6H₂O(l) => 4H₃PO₄(aq) + 424Kj
moles H₃PO₄ = (944.3g H₃PO₄) /(97.994g H₃PO₄ /mole H₃PO₄)
= 9.64 moles H₃PO₄
From equation reaction ratios ...
4 moles H₃PO₄ => 424 Kj
9.64 moles H₃PO₄ => (?)
4 moles H₃PO₄/9.64 moles H₃PO₄ = (424Kj)/(?)
Energy Released (Kj) = (424Kj)(9.64moles)/(4moles) = 1021.84 Kj
The urinary bladder is a muscular organ of the excretory system that collects urine excreted by the kidney. How does the nervous system help the urinary system in excretion?
Explanation:
it helps in when the kidney has used the needful nutrients been taken then the unwanted waste product it sends it to the nervous system then the nervous system passes the waste product to the bladder in form of urine
Can you build a fire on the moon? Why or why not?
Answer:
No.
Explanation:
We can't build a fire on the moon, because moon's atmosphere lacks oxygen.
[tex] \huge \pink{answer}[/tex]
No lightning of a fire on the surface of the moon is impossible..
[tex] \huge \green {reasons - }[/tex]
surface of the moon lacks oxygen which is important for the formation of fire.Surface of the moon doesn't have wind which disables the fire to burn rapidly.Which of the following represents the molecules of one compound and
atoms of one element?
Answer:
i think its b.c but I'm not sure
Answer:
A
Explanation:
A is element as all of them look the same
b is mixture of atoms
C is mixture of atoms and compounds
D is just atoms
E is mixture of element and compound