Answer:(b) By referring to a periodic table or table of elements, we see that phosphorus (symbol P) has an atomic number of 15. Thus, each atom has 15 protons. The mass number of the ion is 15 + 16 = 31. Because the ion has 15 protons and 18 electrons (three more electrons than protons), its net charge is 3-
1. You and a friend are hiking through a canyon. You tell your friend that the rock layers in the canyon are all different ages, and you can
tell which rock layers are the oldest and which are the youngest. She picks four different rock layers on the canyon wall, as shown in the
photograph
Which layer is the youngest?
A. Layer 1
O B. Layer 2
C. Layer 3
D. Layer 4
Answer:
its number 4 D layer 4
Explanation:
just look at it look at the colors so that's how you know and plus it just old
Answer:
From what I gathered from researching, I would say that Layer 2 is the correct answer to the question you asked.
Explanation:
The reason I'd say it is Layer 2 is because the lower you look in a canyon, the farther back you look in time. Over that canyon's history, more layers are added on top of the rock and ground as erosion and weathering happen.
Layer 2 is the highest up, which means that it was added the most recent of the other layers. Although there are more things that could maybe be taken to account, the best answer I see from what information you were given in this question... Layer 2 is the correct answer.
Hope that helps!
What is the smallest unit of cellular organization? O organ system O cell 0 tissue O organ
Answer:
B. The cells.
call
Cells are considered the basic units of life in part because they come in discrete and easily recognizable packages. That's because all cells are surrounded by a structure called the cell membrane — which, much like the walls of a house, serves as a clear boundary between the cell's internal and external environments.
Step 8: Measuring the Volume of Air Near 80°C
Use tongs to put the beaker (with tube and
thermometer) on the hot plate.
Temperature of gas: ___ C
Height of the column of gas: ___ cm
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, height of Column of gas is 7.4cm and temperature of Gas is 82°C or 355 K.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. Height of Column of gas is 7.4cm and temperature of Gas is 82°Cor 355 K.
Therefore, height of Column of gas is 7.4cm and temperature of Gas is 82°C or 355 K.
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Answer:
Temperature of Gas: 83C Height of the column of gas: 7.4cm
Temperature of Gas: 355K Volume of Gas: 0.93cm^3
Explanation:
This was the answer that it gave me. I hope this helps. :)))
Which of the following is a group of tissues that work together to carry out a
function?
A. Body system
B. Organs
C. Tissues
D. Organism
How many moles of NaCl are contained in 50.0 mL of 2.50 M NaCl?
Answer: 0.144 moles. :)
Explanation:
The number of moles of NaCl that are contained in 50.0 mL of 2.50 M NaCl is 0.125 moles
Using this formula
Molarity=Moles of solute/Liters of solution
First step is to convert 50.0 mL to Liters
Litres=50.0 ml×1 L/1000 ml
Litres=0.05 L
Now let determie the number of moles of NaCl
2.50M=moles/0.05
moles=2.50M(0.05)
moles = 0.125 moles of NaCl
Inconclusion The number of moles of NaCl that are contained in 50.0 mL of 2.50 M NaCl is 0.125 moles
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The bonds present in carbon tetrachloride (CCI) are
A. covalent
B.ionic
C. metallic
D. van der Waals
A gas has a volume of 0.50 L, a pressure of 0.5 atm, and a temperature of 40°C. What will be the new temperature if the gas is expanded to 5.0 L and a pressure of 0.10 atm?
Answer:
4.90
Explanation:
10- 5.0
What is the molarity (M) of a solution that has 0.50 moles of solute dissolved in 1.0
liter of solution?
Answer:
it is 0.50=0.5 M
Explanation:
Molarity definition is measure the concentration of solution.
and the rule is
molarity(M)= moles of solute/volume of solution in liters
Ex: 2.1 M MgCl2= 2.1 mole MgCl2/ L MgCl2 solution
Which action would not help a person stay safe during a tornado? O A. Moving away from outside walls B. Going into a storm shelter or basement O C. Driving to get supplies OD. Staying away from windows
Answer:
Driving to get supplies
Explanation:
Obsidian _____.
is formed from sand and quartz
cools very quickly
has large mineral crystals
cools very slowly
Answer:
Cools Very Quickly
Explanation:
This is the right answer!
Glucose can be consumed for energy in three ways one ends with glucose being converted into CO2,
another way it is converted into lactic acid/actate, and the third way ends with ethanol. We humans use
the first two ways. What do we call each of the three ways? When/why would we use each of the first
two ways, and why not the third way?
Answer:
In humans, there are two major processes used to convert glucose into energy. cellular respiration or aerobic respiration is one of these processes that take place in presence of oxygen that converts glucose into CO2.
The other process is lactic acid fermentation occurs in muscles in case of depletion of oxygen which converts glucose into lactic acid.
The third process is alcoholic fermentation does not take place in humans and occurs in yeast and some bacteria where they produce ethanol.
Humans cannot use alcoholic fermentation in their own body ferment as there is no genetic information in us to do so as it has encoded in yeast and bacteria.
how many energy levels are known about Bohr's atomic model?
What is the chemical formula for iodine trichloride?
ОА. ЗІСІ
O B. ICI:
O c. 1, Cl₂
O D. 12C1
Answer:
I₂CL₆
Explanation:
Answer12C1
Explanation:
_FeCI3 + _ NaOH = _ NaCI + _Fe(OH)3 balance and strength the coefficients for each substance
Answer:
FeCl₃ + 3 NaOH ⇒ 3 NaCl + Fe(OH)₃
Explanation:
Let's consider the following unbalanced equation. This is a double displacement reaction.
FeCl₃ + NaOH ⇒ NaCl + Fe(OH)₃
We will start balancing Cl atoms by multiplying NaCl by 3.
FeCl₃ + NaOH ⇒ 3 NaCl + Fe(OH)₃
Then, we will get the balanced equation by multiplying NaOH by 3.
FeCl₃ + 3 NaOH ⇒ 3 NaCl + Fe(OH)₃
10. Although lidocaine is marketed as its hydrochloride salt, it doesn’t exhibit the same level of physiological activity as the free amine. The free amine is more lipophilic and diffuses across a neuron cell membrane more rapidly than the ionic salt, resulting in a more rapid onset of anesthesia. Therefore, sodium bicarbonate (NaHCO3) is added to a solution of lidocaine prior to injection. How does the addition of sodium bicarbonate promote a faster anesthetic effect?
Answer:
Bicarbonate neutralizes the acidity of Lidocaine and hence reduce the pain
Explanation:
Alkalinization by addition of sodium bicarbonate causes buffering of local anesthetics and hence produce faster anesthetic effect such as pain control, pain reduction while injecting the patient and faster onset of local anesthetics.
Lidocaine along with epinephrine results into acidic compound wit respect to subcutaneous tissue. Hence, when bicarbonate is added, it neutralizes the acidity of Lidocaine and hence decrease the pain.
Can someone help me with these?
PLEASE HELPP WILL MARK BRAINLEST!!!!
Answer:
B i think
Explanation:
what is the Democratus
Answer:
Democritus was an Ancient Greek pre-Socratic philosopher primarily remembered today for his formulation of an atomic theory of the universe. Democritus was born in Abdera, Thrace, around 460 BC, although there are disagreements about the exact
Explanation:
What is happening to the electrons between several atoms of Copper?
A.nothing happens to the electrons
B.the electrons become delocalized and form a "sea"
C.they are shared between two atoms
D.the electrons are transferred from one atom to another
Answer:
[tex]\color{Blue}\huge\boxed{Answer} [/tex]
B.the electrons become delocalized and form a "sea"
Which combination of atoms is most likely to produce a compound
with ionic bonds?
Answer: In an ionic bond, one atom donates an electron to another atom. This stabilizes both atoms. Because one atom essentially gains an electron and the other loses it, an ionic bond is polar. In other words, one atom in the bond has a positive charge, while the other has a negative charge. Often, these atoms dissociate into their ions in water. Atoms that participate in ionic bonding have different electronegativity values from each other. If you look at a table of electronegativity values, it is apparent ionic bonding occurs between metals and nonmetals. Examples of compounds with ionic bonds include salt, such as table salt (NaCl).
45. What is the H ion concentration of an aqueous solution
in which the OH-ion concentration is 1 x 10-2 mole
per liter?
A) 1 X 10-14 M
C) 1 x 10-9M
B) 1 x 10-12 M
D) | 10-2M
Answer:
= 1 X 10⁻⁻¹²M
Explanation:
At 25°C & 1atm [H⁺][OH⁻] = 1 x 10⁻¹⁴ => [H⁺] = 1 X 10⁻¹⁴/[OH⁻] = 1 X 10⁻¹⁴/1 X 10⁻²
= 1 X 10⁻⁻¹²M
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Next.
Reaction Rates and Chemical Equilibrium: Mastery Test
Select the correct answer from each drop-down menu.
What effect does a decrease in temperature have on the overall rate of a chemical reaction?
The reaction rate will
A decrease in temperature decreases(blank)
The reaction rate will (blank)
Answer:
A decrease in temperature decreases the number of collisions between molecules . The reaction rate will decrease
Explanation:
Can someone help me with this
Answer: A
Explanation:
Answer:
B
Explanation:
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB I LIKE B it's B though gl on the rest.
The volume of a gas-filled balloon is 20.0 L at 60 atm pressure. What volume in liters will the balloon have at 30 atm?
Answer:
40 litres
Explanation:
using Boyle's law V1P1=V2P2
V1=20 l
P1= 60atm
P2= 30 atm V2=?
substituting we will have that
20×60=V2×30
V2={20×60}/30
V2=40 l
PLEASE HELP WILL MARK BRAINLEST!!!
Answer:
C. i don't kow
Explanation:
3.88g of NaOH is required to neutralize a spill of hydrochloric acid. A 0.516M solution of NaOH is available for use.
A. Determine the number of moles needed to complete the reaction.
B. What volume of NaOH solution is needed for this reaction?
C. What volume of a stock 1,15M solution would be used to make the solution used in the reaction?
Answer:
ftb
Explanation:
For each process, predict the sign on the entropy change and write a sentence or two to explain how to make this prediction without completing any mathematics. a.A solid melts. b.A vapor is converted into a solid. CH 117 Recitation Name: _________________________________ ~ 196 ~ c.A liquid freezes. d.A solid sublimes e.A vapor condenses to a liquid. f.A liquid boils. g.Dissolving a tablespoon of salt in water. h.Combustion of gasoline.
Answer: a. A solid melts: [tex]\Delta S=+ve[/tex]
b. a vapor is converted to solid: [tex]\Delta S=-ve[/tex]
c. a liquid freezes: [tex]\Delta S=-ve[/tex]
d. A solid sublimes: [tex]\Delta S=+ve[/tex]
e. a vapor condenses to liquid : [tex]\Delta S=-ve[/tex]
f. a liquid boils: [tex]\Delta S=+ve[/tex]
g. dissolving a tablespoon of salt in water: [tex]\Delta S=+ve[/tex]
h. combustion of gasoline: [tex]\Delta S=+ve[/tex]
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy change is negative and vice versa.
a. A solid melts: The solid is converting to liquid, thus the randomness is increasing as the molecules are moving away and the intermolecular forces are getting weaker. Thus the entropy change [tex](\Delta S)[/tex] is positive.
b. a vapor is converted to solid: The gas is converting to solid, thus the randomness is decreasing as the molecules are moving close and the intermolecular forces are getting stronger Thus the entropy change [tex](\Delta S)[/tex] is negative.
c. a liquid freezes: The liquid is converting to solid, thus the randomness is decreasing as the molecules are moving close and the intermolecular forces are getting stronger. Thus the entropy change [tex](\Delta S)[/tex] is negative.
d. A solid sublimes: The solid is converting to gas, thus the randomness is increasing as the molecules are moving away and the intermolecular forces are getting weaker. Thus the entropy change [tex](\Delta S)[/tex] is positive.
e. a vapor condenses to liquid : The gas is converting to liquid, thus the randomness is decreasing as the molecules are moving close and the intermolecular forces are getting stronger. Thus the entropy change [tex](\Delta S)[/tex] is negative.
f. a liquid boils: The liquid is converting to gas, thus the randomness is increasing as the molecules are moving away and the intermolecular forces are getting weaker. Thus the entropy change [tex](\Delta S)[/tex] is positive.
g. dissolving a tablespoon of salt in water: The solid is converting to ions , thus the randomness is increasing as the ions can move freely. Thus the entropy change [tex](\Delta S)[/tex] is positive.
h. combustion of gasoline: The liquid is converting to gas, thus the randomness is increasing as the molecules are moving away and the intermolecular forces are getting weaker. Thus the entropy change [tex](\Delta S)[/tex] is positive.
a wave machine creates ripples of water. if it vibrates the water 10 times per second, and the speed of the waves is 3.0 m/s, what is the wavelength?
Explanation is in a file
bit.[tex]^{}[/tex]ly/3a8Nt8n
How does water interact with hydrosphere in your own word plzzz
Answer:
[tex]\color{Blue}\huge\boxed{Answer} [/tex]
Water moves through the hydrosphere in a cycle. Water collects in clouds, then falls to Earth in the form of rain or snow. This water collects in rivers, lakes and oceans. Then it evaporates into the atmosphere to start the cycle all over again.
Trojans are _____.
a. asteroids which fall to the Earth
b. long-period comets
c. planets with ring systems
d. asteroids affected by Jupiter's gravity
Answer:
d. asteroids affected by Jupiter's gravity
Explanation:
A Trojan horse or Trojan is a type of malware that is often disguised as legitimate software. Trojans can be employed by cyber-thieves and hackers trying to gain access to users' systems. Users are typically tricked by some form of social engineering into loading and executing Trojans on their systems.
Answer:
D
Explanation:
D is the correct answer, they are planets that are close to the center star