Answer:
D. Existing skin cells near the injury reproduced to make new cells.
Samuel tripped while playing basketball and skinned his knee on the concrete. Many of the skin cells on that knee were killed or removed entirely, leaving his knee open and unprotected. Eventually, his knee scabbed over, and when the scabs fell off, there was new skin underneath. The new skin come from Existing skin cells near the injury reproduced to make new cells.
What are cells in our body?Cells are the smallest unit in living organisms which lives on it's own and makes up tissues in living organisms. The Four Main Types of Cells are-
Epithelial Cells.
Nerve Cells.
Muscle Cells.
Connective Tissue Cells.
The body of an average man contains around 30 to 40 trillion cells.
Cells provide structure and function for all living things, from microorganisms to humans. Scientists consider them the smallest form of life. Cells house the biological machinery that makes the proteins, chemicals, and signals responsible for everything that happens inside our bodies.
Cells can vary between 1 micrometer (μm) and hundreds of micrometers in diameter. Within a cell, a DNA double helix is approximately 10 nanometers (nm) wide, whereas the cellular organelle called a nucleus that encloses this DNA can be approximately 1000 times bigger (about 10 μm).
Therefore, The new skin come from Existing skin cells near the injury reproduced to make new cells.
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A student is a passenger in the front seat of a moving car. Which object is the BEST frame of reference for the student to determine how fast the car is moving relative to the ground?
A) A signpost on the side of the road
B) A truck traveling in the lane next to the car
C) The driver sitting next to the student
D) A person sitting in the backseat of the car
Answer:
the sing post
Explanation:
because the reference frame is a fixed object that determines whether a body is in motion or not so the other passengers are fixed but relative to the the the man is at rest but relative to the sign post it is in the motion, did I get me, sister
how many moles of h20 are produced from 3 moles of oxygen?
Answer:
Stoichiometric Values in a Chemical Reaction
Explanation:
The coefficients next to the reactants and products are the stoichiometric values. They represent the number of moles of each compound that needs to react so that the reaction can go to completion.
The process of moving water from its source to places where humans use it is called water diversion. true or false
Answer:
That is def true
Explanation:
URGENT!! Can someone help me with this?
A sample of oxygen gas has a volume of 2.1 L at 3.6 atm pressure and 200 K temperature.
What would the volume of this sample be at 1.0 atm and 400 K?
Answer:
15.1L
Explanation:
Given parameters:
Initial volume = 2.1L
Initial pressure = 3.6atm
Initial temperature = 200K
Final pressure = 1 atm
Final temperature = 400K
Unknown:
Final volume of the sample = ?
Solution:
To solve this problem, we are going to use the general gas law or the combined gas law which is expressed below:
[tex]\frac{P_{1} V_{1} }{T_{1} } = \frac{P_{2} V_{2} }{T_{2} }[/tex]
P, V and T are pressure, volume and temperature
1 and 2 are the initial and final states
Now;
[tex]\frac{2.1 x 3.6}{200}[/tex] = [tex]\frac{1 x V_{2} }{400}[/tex]
200V₂ = 3024
V₂ = 15.1L
Answer:
15.1L
Explanation:
Given parameters:
Initial volume = 2.1L
Initial pressure = 3.6atm
Initial temperature = 200K
Final pressure = 1 atm
Final temperature = 400K
Unknown:
Final volume of the sample = ?
Solution:
To solve this problem, we are going to use the general gas law or the combined gas law which is expressed below:
P, V and T are pressure, volume and temperature
1 and 2 are the initial and final states
Now;
=
200V₂ = 3024
V₂ = 15.1L
Which is the most likely to be reduced
Answer:
B
Explanation:
Answer: Fe3+
Explanation: j took the quiz
1. (03.07 LC) Carbon atoms naturally bond with each other in chains, rings, or networks, but they cannot bond with oxygen or nitrogen. (2 points) True False
Answer:
false
Explanation:
Carbon atoms are found in hydrocarbons, naturally occurring compound with carbon and hydrogen, but there are molecules in nature that contain beside carbon and hydrogen, oxygen and nitrogen too. In this compounds there are carbon-oxygen and carbon-nitrogen covalent bonds.
Bellow you may see the chemical structure of adrenaline, a hormon found in the human body, were the oxygen (red) and nitrogen (blue) are bonded to carbon.
Answer:
false
Explanation:
Carbon atoms often naturally bond with each other in chains, rings, plates, or networks, and they also bond readily with hydrogen, oxygen, nitrogen, sulfur, phosphorus, and the halogens.
Which of the following statements are true about energy and bonds?
Check all that apply.
A. Energy is necessary for bond formation.
B. Breaking bonds does not absorb or release energy.
C. Breaking bonds takes energy.
D. When bonds are formed, energy is released.
Answer:
A. Energy is necessary for bond formation.
C. Breaking bonds takes energy.
D. When bonds are formed, energy is released.
Explanation:
Energy is always required for bond formation because when a chemical reaction occurs, either molecular bonds are broken or other bonds are formed to make different molecules. Energy is released during bond formation and is an exothermic process because bond formation represents a stable configuration and the energy lost is released as heat energy that makes it more stable.
Breaking bonds takes energy and is an endothermic reaction because energy is absorbed to break bonds.
Hence, the correct answer is "A. Energy is necessary for bond formation.
C. Breaking bonds takes energy.
D. When bonds are formed, energy is released."
when a magnet is moved alongside a wire, what happens?
A. the electric movement stops
B. the protons move to the correct poles
C. the magnet repels like forces
D. the electrons in the wire begin to flow
Explanation:
D.the electrons in the wire begin to flow
An aqueous solution is 1.00% by mass ethanol, CH3CH2OH, and has a density of 0.996 g/mL.
The molarity of ethanol in the solution is
M.
The molarity of ethanol in the solution is 0.217 M
Further explanationGiven
1% by mass
density = 0.996 g/ml
Required
The molarity
Solution
mass/ml of Ethanol :
1% x 0.996 g/ml = 0.00996 g/ml
For 1 L solution :
0.00996 g/ml x 1000 ml/L = 9.96 g/L
Convert to mol/L(MW ethanol=46 g/mol) :
9.96 g/L : 46 g/mol= 0.217 mol/L = 0.217 M
Or you can use equation :
[tex]\tt M=\dfrac{\%mass\times \rho\times 10}{MW}\\\\M=\dfrac{1\times 0.996\times 10}{46}=0.217[/tex]
What is the percent yield of lithium hydroxide from a reaction of 7.40 g of lithium with 10.2 g of water? The actual yield was measured to be 12.1 g.
2Li(s) + 2H2O(l) = 2LiOH(aq) + H2(g)
Select one:
a. 72.5%
b. 53.1%
c. 89.3%
d. 47.4%
Answer: d. 47.4%
What is the percent yield of lithium hydroxide from a reaction of 7.40 g of lithium with 10.2 g of water? The actual yield was measured to be 12.1 g.
Identify each of the following as either an element or Compound. Write (E) for Element and (C)
for compound.
a. carbon
b. water
C. aluminum foil
d. plastic
e, tin
f. silicon dioxide
g. helium
h, arsenic
i. carbon dioxide
j. sodium chloride (table salt)
Carbon = C
Water = C
Aluminum foil = E
Plastic = E
Tin = E
Silicon dioxide = C
Helium = C
Arsenic = C
Carbon dioxide = C
Sodium Chloride = C
If an atom has 7 protons, 8 neutrons and 9 electrons, what is the mass number?
Answer:
Its mass number is 15
And this element is nitrogen N
Explanation:
Because mass number = number of proton + number of neutrons
So 7+ 8 = 15
PLEASE help due in 25 minutes
Determine the mass in grams of each of the following:
5.04 x 1024 atoms N
2.01 x 1024 atoms Ca
8.32 x 1021 atoms Sn
Determine the number of particles contained in each of the following:
50.3 g Cu
145g Si
0.67 g Cl
Answer:
method to do this given in explaination
Explanation:
divide the number of atoms with avagadro constant and multiply with the molar mass of each atom - to obtain the mass in g
divide the mass with molar mass and multiply with avagadro constant to obtain the number of particles
what is this equivalent to
-k+3k
Answer:
2k
Explanation:
Answer:
+2k
Explanation:
Because +++k and -k answer is ++k
One +Cancel with -
how ferons is responsible for depletion of ozone layer?
which of the following is a compound A. Iron B. Alloy C. rock salt D. sugar
Answer:
I think iron sorry if its wrong goodluck!
DESPERATE WILL GIVE BRAINLIST
Meiosis produces diploid cells.
True
False
Answer:
FalseMeiosis produces 4 haploid cells. Mitosis produces 2 diploid cells. The old name for meiosis was reduction/ division. Meiosis I reduces the ploidy level from 2n to n (reduction) while Meiosis II divides the remaining set of chromosomes in a mitosis-like process (division).Explanation:
Hope it helps
Answer:
False
Explanation:
Mitosis creates diploid cells, meiosis creates haploid cells.
a student practicing for a track meet ran 300 meters in 30 seconds. what was her average speed?
Answer:
10 m/sExplanation:
Her average speed can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
d is the distance
t is the time taken
From the question we have
[tex]v = \frac{300}{30} = 10 \\ [/tex]
We have the final answer as
10 m/sHope this helps you
What is the name of this formula MnN?
please help quickly!
for the first one ignore what i have pressed as i just guessed and it wont let me remove answers
Answer:
Iron II - pale green
Copper II - blue
Iron III - orange /brown
Nickel - green
Iron and Copper
how would I write these out
Answer:
Please see the attached image. The one on the left is the first one and the one on the right is the second one.
Hope that helps.
How can you explain therma expansion in terms of kinetic energy ? please help
Answer:
Heat causes the molecules to move faster (heat energy is converted to kinetic energy), which means that the volume of a solid or a liquid. ... The particles in the air do not have more kinetic energy than particles in the mercury, because they are the same.
Explanation:
I hope this help you!
Krista is conducting an investigation to determine how much water is best for her
sunflower plants. She uses five plants and gives each a different amount of water for six
weeks. Each week, she measures the height of each plant. She records her findings in the
chart below.
THE EFFECT OF WATER ON SUNFLOWER PLANTS
Week 1 Week 2 Week 3 Week 4 Week 5
Week 6
Amount of
water per
week
50 ml
100 ml
150 ml
200 ml
What information should be recorded below the weeks? (Hint: The dependent variable
should be recorded in the data chart.)
O the time it took each plant to reach a certain height
O the amount of water each plant received
o the amount of sun each plant received
O the height of each plant every week
Answer: Option D:The height of each plant every week
Explanation: In any experiment there are two variables one is independent variable and one is dependent variable.
One values of the experiment that can be changed is the independent variable that is amount of water given to the plants each week.
The values that cannot be changed and is dependent on independent variable is called dependent variable. This means that they change due to the change in the independent variable.
Here, the information that is to be recorded is the dependent variable. Height of each plant every week.
You have 28.5 g of iron shot that has a volume of 3.60 mL. From this information, calculate the density of iron.
Answer:
[tex]\boxed {\boxed {\sf \rho \approx 7.917 \ g/mL}}[/tex]
Explanation
Density can be found by dividing the mass by the volume.
[tex]\rho=\frac{m}{v}[/tex]
We know the iron sheet has a mass of 28.5 grams and the volume is 3.60 milliliters.
[tex]m= 28.5 \ g \\d= 3.60 \ mL[/tex]
Substitute the values into the formula.
[tex]\rho=\frac{28.5 \ g}{ 3.60 \ mL}[/tex]
Divide.
[tex]\rho = 7.91666667 \ g/mL[/tex]
Let's round to the nearest thousandth.
The 6 in the ten-thousandth tells us to round the 6 to a 7.
[tex]\rho \approx 7.917 \ g/mL[/tex]
The density of iron is about 7.917 grams per milliliter.
Date:
Why do scientists study fossils?
A.
to understand how volcanoes are formed
B.
to understand life on Earth as it was millions
of years ago
C.
to understand when mountains were created
Answer:
b
Explanation:
Answer:
I think ur answer would be B
Explanation:
Hope this helps
All alkali metals belong to which group?
A. group 17
B. group 1
C. group 2
D. group 12
Answer:
Group 1
Explanation:
Alkali metals are the chemical elements found in Group 1 of the periodic table. The alkali metals include: lithium, sodium, potassium, rubidium, cesium, and francium.
Answer:
1
Explanation:
mainly so that you can mark the other one brainliest
The columns in the periodic table are called groups. What do the elements in Group 17 have in common
Answer:
They all have 7 valence electrons on it's outer shell.
Answer:
I have that question rn, I think the best answer is that they tend to form ions with a -1 electric charge.
Explanation:
A flask containing 855 grams of water was heated. If the temperature of the water was raised from 21.0 to 85.0 degrees Celsius, how much heat (in joules) did the water absorb? the specific heat capacity of liquid water is 4.184J/g per C
Answer:
The heat absorbed by the water is 228,948.48 J
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
In this way, between heat and temperature there is a direct proportional relationship (Two magnitudes are directly proportional when there is a constant so that when one of the magnitudes increases, the other also decreases; and the same happens when either of the two decreases .). The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat and the mass of the body. So, the equation that allows to calculate heat exchanges is:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.
In this case:
c= 4.184 [tex]\frac{J}{g*C}[/tex]m=855 gΔT= Tfinal - Tinitial= 85 °C - 21°C= 64 °CReplacing:
Q= 4.184 [tex]\frac{J}{g*C}[/tex] *855 g* 64 C
Solving:
Q= 228,948.48 J
The heat absorbed by the water is 228,948.48 J
(BRAINLIEST) PLEASE HELP!
Answer:
The answer would be Helium-8.
Which is the most likely to be reduced?
Answer : The correct option is, [tex]Zn^{2+}[/tex]
Explanation :
Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. That means, the loss of electrons takes place.Or we can say that, oxidation reaction occurs when a reactant losses electrons in the reaction.
Reduction reaction : It is defined as the reaction in which a substance gains electrons. That means, the gain of electrons takes place.Or we can say that, reduction reaction occurs when a reactant gains electrons in the reaction.
According to the electrochemical series, [tex]Zn^{2+}[/tex] most likely to be reduced because
Hence, the ion most likely to be reduced is [tex]Zn^{2+}[/tex].
The most likely to be reduced is Cu ²⁺. Because it is stronger oxidizing agent.
What is an oxidizing agent ?In a redox chemical reaction, an oxidizing agent is a material that "accepts" or "receives" an electron from a reducing agent. So every substance that oxidizes another material is an oxidant.
A material that induces oxidation by receiving electrons becomes reduced when it acts as an oxidizing agent. A chemical that reduces something by gaining electrons is said to be an oxidizing agent.
The reduction that takes place, which involves Cu, is the one with the highest positive reduction potential. This is because either Cu2+ is a stronger oxidizing agent than Zn2+ or Cu2+ is more likely to be reduced than Zn2+.
Thus, option D is correct.
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