Now
[tex]\\ \sf\longrightarrow pH=-log[H^+][/tex]
[tex]\\ \sf\longrightarrow pH=-log10^{-2}[/tex]
[tex]\\ \sf\longrightarrow pH=2[/tex]
Someone help me please! I will mark brainliest if it’s right!
Answer:
a) compound
b)element
c)mixture
d)compound
Explanation:
What evidence is there on the surface of the Earth of it's formation?
Answer: when the solar system settled into its current layout about 4.5 billion years ago, earth formed when gravity pulled swirling gas & dust in to become the third planet from the sun. like its fellow terrestrial planets, earth has a central core, a rocky mantle, & a solid crust.
There are three subatomic particles found inside atoms. Two of the subatomic particle have a charge of positive or negative. The one particle that does NOT have a charge is the:
A,proton
B, neutron
C, electron
D, none of the above
Answer:
neutron, and the way I remember that is because NEUTron is NEUTral
Explanation:
proton are positive (both start with a 'p') and electrons are negative
Y’all answer as many as u can they just need to be correct thx!!!!
(WILL MARK BRAINLIEST)
(you can use google) it didn’t help me tho :(
Answer:
10. Embryology is the branch of biology and medicine concerned with the study of embryos and their development.
11. I think the answer is, Both humans and whale embryos have a tail and a backbone (I'm not sure).
12. Basilosaurid, any member of the family Basilosauridae, an early group of whales that lived from the middle Eocene to the late Oligocene Epoch (about 41 million to 23 million years ago).
13. Protocetids had long snouts, large eyes, and their nasal opening was farther caudally than in earlier archaeocetes.
14. Two ways we know that Maiacetus was a whale re:
1) Their skeletons have all been found among fossils of sea-creatures which suggests they lived in the sea.
2) Their hip bones were strong enough to walk on land, but their short legs combined with long flat fingers and toes suggest they would have had difficulty walking.
15. The name Maiacetus means Mother Whale. Maiacetus is significant because of how well the skeletons were preserved.
Hope this helps! :D
10.Which device is designed to produce
mechanical energy?
(1) a fan
(2) a battery
(3) a lamp
(4) an oven
Which device is designed to produce mechanical energy?
Well, mechanical energy is the sum of potential and kinetic energy. Kinetic energy is a unit of energy in which is the reason why an object does movement, while potential energy is another unit of energy in which is the reason why an object doesn't move, or stops. While you can stop a fan or a lamp, it isn't automatic. It's manually. So the answer is (4) an oven because mechanical energy happens automatically, not manually, or for a greater reason.
When a planet has the illusion of moving backwards or bouncing up and down it is exhibiting what?
Answer: It is exhibiting retrogade motion.
The surface tension of water _is because it's molecules form_.
Answer:
Hello! I am very sorry I do not know the exact answer to this but here is some information that may help!
Surface tension in water owes to the fact that water molecules attract one another, as each molecule forms a bond with the ones in its vicinity. This inward net force causes the molecules on the surface to contract and to resist being stretched or broken.
Explanation:
Again I am very sorry I could not give you the answer you were looking for. I hope the information above has helped you even a little! I am very sorry if this is not what you were looking for. Have a great rest of your day or night and good luck on your work!
<3 <3 <3
I NEED THIS ASAP TODAY PLEASSSSEEEEEE
The gravitational pull of the Moon is much less than the
gravitational pull of Earth. Consider an object with a mass
of 10 kilograms that weighs 22 pounds on Earth.
Which statement describes the object on the Moon?
A. Its weight would be much greater.
B. Its mass would be much greater.
C. Its mass would be the same.
D. Its weight would be the same.
Option C, mass would be same. Only the gravitational pull will be different
hello people ~
The chemical formula of magnesium oxide is?
(a) MgO2
(b) Mg2O
(c) MgO
(d) Mg(OH)2
Answer:
MgO
Magnesium has valency 2Oxygen also has valency 2So 2-2 gets cancelled out and the formula becomes MgOWhat is the relationship of moles of copper to moles of iron in a reaction between CuCl2 and Fe?
Chemistry
Equation: Fe+CuCl2>FeCl2+Cu
Under what conditions will a gas be most likely to exhibit the ideal gas properties predicted by the ideal gas law?
- High pressures and high temperature, because particles are forced closer together with higher kinetic energy, so intermolecular forces of attraction are weaker
- High pressure and low temperature, because particles are forced closer together and moving slower, so the volume of the particles is less significant
- Low pressure and high temperature, because particles are spread farther apart and moving faster, so the intermolecular forces of attraction are weaker
- Low pressure and low temperature, because particles are spread farther apart with lower kinetic energy, so the volume of the particles is less significant
Answer:
High pressure and low temperature, because particles are forced closer together and moving slower, so the volume of the particles is less significant
Answer:
A gas at very low volumes, when gas particles are very close together
A gas at very low temperatures, when gas particles have very little kinetic energy
A gas with highly polar molecules that have very strong inter-molecular forces
Explanation:
According to kinetic molecular theory:
a) Ideal gases have large number of particles which were considered to be hard spherical objects.
b) these gas particles move randomly in a straight line.
c) the path of gas particles change when they collide with each other or walls of vessel.
d) there is no or negligible inter molecular interactions between the gas particles.
e) the inter molecular distances is much higher than the size of particles.
f) the gas particles occupy negligible volume of the vessel.
g) during collision of gas particles is perfectly elastic.
h) the average kinetic energy of particles is constant at a constant temperature. It varies directly with the temperature.
In which beaker or beakers are the particles moving the most slowly?
A. Beakers B and C
B. Beaker C only
C. Beaker a only
D. Beakers A and D
Answer: beakers A and D
Explanation:
These two beakers have the lowest temperatures, meaning the particles move slower than the other two beakers.
Answer:
A and D
Explanation:
give 5 causes of diseases or infectious diseases
Answer:5 causes of diseases or infectious disease is
1.bacteria
2.indirect/direct contact with a sick person or contaminated item
3.viruses
4.food contamination
5.not washing hands with soap or water/ not getting vaccinated/not getting certain vaccines
(hope this is helpful)
Explanation:
hich variables are represented in the ideal gas law?
select all that apply
Moles
Mass
Ideal gas constant
Volume
PV=nRT
Explanation:
P- pressure
V- volume
n-moles
R- constant gas
T- temperature
A negatively charged ion that has gained electrons to satisfy the octet rule
Anions. Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions.
How many total atoms of Sodium are represented below
 60 points! please help me! will appreciate it!
Answer:
[tex]\huge\boxed{\sf Mass = 726.96\ g}[/tex]
Explanation:
In the reaction:
For 2 moles of Na, 1 mol of H₂ is produced
At STP,
1 mol of H₂ = 22.4 L/mol molar value
Converting 354 L to moles:
= volume / molar value
= 354 / 22.4
= 15.8 moles
We already know that:
1 mol of H₂ ↔ 2 moles of Na
So,
15.8 moles of H₂ ↔ 15.8 × 2 moles of Na
15.8 moles of H₂ ↔ 31.6 moles of Na
So, to produce 15.8 moles of H₂ (354 L), we need 31.6 moles of Na.
Converting 31.6 moles of Na into mass:
Mass = moles × molar mass
Mass = 31.6 × 23
Mass = 726.96 g
[tex]\rule[225]{225}{2}[/tex]
The chemical equation below shows the decomposition of nitrogen triiodide (ni3) into nitrogen (n2) and iodine (i2). 2ni3 right arrow. n2 3i2 the molar mass of ni3 is 394.71 g/mol. how many moles of i2 will form 3.58 g of ni3? 0.00907 moles 0.00940 moles 0.0136 moles 0.0212 moles
The moles of diiodine is formed from the nitrogen triiodide is 0.0212 moles.
How we calculate moles from mass?Relation between the moles and mass of any substance will be represented as:
n = W/M, where
n = moles
W = given mass
M = molar mass
Given chemical reaction is:
2NI₃ → N₂ + 3I₂
Moles of 5.58g of NI₃ will be calculated as:
n = 5.58g / 394.71g/mol = 0.0141 mole
From the stoichiometry of the reaction, it is clear that:
2 moles of NI₃ = produce 3 moles of I₂
0.0141 moles of NI₃ = produce 3/2×0.0141=0.02115 = 0.0212 moles of I₂
Hence option (4) is correct i.e. 0.0212 moles.
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Answer:
C
Explanation:
Right on edge 2022
Which element makes up most of the air we breathe.
Gravity is an example of what
Answer:Some examples of the force of gravity include;
-The force that holds the gases in the sun.
-he force that causes a ball you throw in the air to come down again.
-The force that causes a glass you drop to fall to the floor.
-The force that keeps the Earth and all of the planets in line in the proper position in their orbits around the sun.
-The force that causes an apple to fall downward from an apple tree.
-he force that keeps you walking on Earth instead of floating away into space.
8. Which pair of substances react together?
A bromine and potassium chloride
B bromine and potassium iodide
C iodine and potassium bromide
D iodine and potassium chloride
How are compounds with ionic and covalent bonds alike?
A.Both conduct electricity when dissolved in water
B.Both are made up of metals
C.Both have at least some
compounds that can dissolve in water
D.Both have high melting points
Answer:
B
Explanation:
How many Magnesium atoms are there in Mg(PO4)2?
Answer:
10
Explanation:
because 4 for 2 is 8 and the one invisible in p for 2 is 2, adding the 2+ 8 Is 10 are the atoms of Magnesium.
C. boiling
7
Which of these sentence is NOT true regarding heating a substance. *
(1 Point)
A. The speed of the particles increases
B. The space between the particles increases
C. The volume increases
D. The mass increases
Please help me
Answer:
Which of these sentence is NOT true regarding heating a substance?
Your answer is D.The mass increases
Please help!! I don’t think I did this right.?
Answer: I think you did it the right way-I think
Explanation:
Hope that helps!
Name: King
is potato chip crumbs made of atoms?
yes or no, explain why.
Yes. All matter is made of atoms in some way. Even the smallest crumbs are made of quadrillions of atoms. The number of atoms is simply mind boggling.
1 quadrillion = 1,000,000,000,000,000
There are 15 zeros in that number. It might be better to express it as
1 quadrillion = 1.0 * 10^15
Scientific notation compacts large numbers such as this to make it more readable, and allow for faster writing.
In a chemical reaction, substance r reacts with compound xy to produce 47.0 g of compound rx. if the theoretical yield of rx is 56.0 g, what is its percent yield? use percent yield equals startfraction actual yield over theoretical yield endfraction times 100.. 9.00% 16.1% 83.9% 119%
The percent yield of the given reaction when substance r reacts with compound xy to produce 47.0 g of compound rx is 83.9%.
What is percent yield?Percent yield of any reaction will tells about the loss in the production of the propduct in terms of percentage by comparing the standard yield.
Percent yield will be calculated as:
% yield = (actual yield / theoretical yield) × 100
Given actual yield = 47g
Given theoretical yield = 56g
On putting tese values on the above equation, we get
% yield = (47/56) × 100 = 83.9%
Hence, correct option is (3) i.e. 83.9%.
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Answer:
83.9%
Explanation:
A 5.00-wt% aqueous sulfuric acid solution (p=1.03 g/ml) flows through a 45-m long pipe with a 6.0 cm diameter at a rate of 82 L/min. a) What is the molarity of sulfuric acid in the solution? b) How long in seconds) would it take to fill a 55-gallon drum, and how much sulfuric acid (lbm) would the drum contain? c) The mean velocity of a fluid in a pipe equals the volumetric flow rate divided by the cross-sectional area normal to the direction of flow. Use this information to estimate how long (in seconds) it takes the solution to flow from the pipe inlet to the outlet.
Answer:
Explanation:
a )
5 gram of sulfuric acid in 100 gram of solution
volume of 100 gram of solution = 100 / 1.03 ml
= 97.08 ml = .097 L
5 gram of sulfuric acid = 5 / 98 moles = .051 moles
.051 moles in .097 L solution
molarity = .051 / .097 = .525 M .
b ) 55 gallon = 3.7854 x 55 L = 208 L
rate of flow = 82 L / min
time taken to fill the drum = 208 / 82 min = 2.536 min .
volume of sulfuric acid = 208 L
mass = volume x density = 208 x 1000 x 1.03 gram = 214.24 kg
214.24 kg = 214.24 x 2.2 lb = 471.33 lb
c )
cross sectional area = 3.14 x 3² = 28.26 cm²
rate of flow = 82 L / min = 82 x 1000 cm³ / min
= 82000 / 60 cm³ / sec = 1366.67 cm³ / s
velocity = 82 x 1000 / 1366.67 = 60 cm / s = .6 m / s
length of pipe = 45 m
time taken = 45 / .6 = 75 s
how many pencils are in 1 mole of pencils
Answer:
1 mole of pencil = 6.02X1023 number of pencils
Explanation:
if 0.500 mol of a non-electrolyte solute are dissolved in 500g of ether what is the freezing point of the solution
Answer:
the answer might be 250g for the this question hope this helps
Explanation:
Since the solute is dissolved in ether, which has a freezing point of -116.3 °C, the freezing point of the solution will be: -116.3 °C - 5.24 °C = -121.5 °C.
What is freezing point?
To solve this problem, we need to use the formula for freezing point depression:
ΔTf = Kf · m
where ΔTf is the change in freezing point, Kf is the freezing point depression constant of the solvent, and m is the molality of the solution.
Since the solute is a non-electrolyte, it does not dissociate in the solvent, so the number of particles in solution is the same as the number of moles of solute:
molality = moles of solute / mass of solvent (in kg)
First, we need to calculate the mass of ether in kg:
mass of ether = 500 g = 0.5 kg
Next, we can calculate the molality of the solution:
molality = 0.500 mol / 0.5 kg = 1.00 mol/kg
The freezing point depression constant for ether is 5.24 °C·kg/mol. We can now use this value and the molality to calculate the change in freezing point:
ΔTf = Kf · m = 5.24 °C·kg/mol · 1.00 mol/kg = 5.24 °C
Since the solute is dissolved in ether, which has a freezing point of -116.3 °C, the freezing point of the solution will be:
freezing point of solution = -116.3 °C - 5.24 °C = -121.5 °C
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