Answer:
B)
Morse code
Explanation:
Morse code is a communication system developed by Samuel Morse, an American inventor, in the late 1830s. The code uses a combination of short and long pulses – dots and dashes, respectively – that correspond to letters of the alphabet.
Answer:
b
Explanation:
I got it right on the exam. Morse code is your answer.
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. Where did the new skin come from? A. Skin cells near the injury increased in size to cover the injury. B. Existing cells near the injury changed into skin cells to cover the injury. C. Extra skin cells from other parts of Samuel's body were moved to the injury. D. Existing skin cells near the injury reproduced to make new cells.
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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urgent plzz help meeee thx
Answer:
8
Explanation:
From the question given above, the following data were obtained:
t–butyl ion = (CH₃)₃C⁺
Number of valence electron =?
The valence electron(s) talks about the combining power of an element or compound as the case may be.
Considering the t–butyl ion, (CH₃)₃C⁺ we can see that it has a charge of +1 indicating that it has given out 1 electron to attain the stable octet configuration which has a valence electrons of 8. Thus, the valence electron of t–butyl ion, (CH₃)₃C⁺ is 8
The image above was taken by the Galileo spacecraft as it visited the asteroid belt on its way to Jupiter. Shown in the image are two rocky-iron bodies. The large object on the left is an asteroid named Ida. The object on the right, which measures only about 1 mile across, is named Dactyl.
Dactyl is a tiny moon that orbits the asteroid Ida. Dactyl orbits Ida due to
A.
the mutual gravitational attraction between the two objects.
B.
small differences in the objects' rocky-iron compositions.
C.
electrical energy transferred between the two objects.
D.
the magnetic force field that defines the asteroid belt.
Answer:
Dactyl orbits Ida due to;
A. The mutual gravitational attraction between the two objects
Explanation:
An orbit is the curved repeating and regular gravitational path of an object that moves round another planet. An object in an orbit moves with the orbital velocity required to bring about an equilibrium between the the mutual gravitational pull (attraction) from the body around which the object cycles and the object and the object's inertia to move in a straight line
Therefore, the moon Dactyl is able to orbit the asteroid Ida due to the force of gravitation between the Dactyl and Ida.
Answer:
A. The mutual gravitational attraction between the two objects
Explanation:
Please help me !!!!
Answer:
12, 28, 16
Explanation:
If we are trying to find mass, neutrons are our guy. 28 "mass points" means 28 neutrons. Each neutron is one point
We know there are 12 protons and electrons if we look at a table of elements, the number in the top-left is always the number of protons and we can subtract mass from the protons to get our electrons
if a block weighs 125 grams and it has a volume of 5 mL, what is it's density?
is sugar made of tiny particles
if evaporation occurs what will change 0.70 molar solution of CuSO4
A. Molarity will increase
B. Molarity will decrease
C. the amount of CuSO4 will decrease
D. No change in molarity or amount of salute
Answer:
A. Molarity will increase .
Explanation:
Molarity = moles of solute per litre of solution
= moles of solute / volume of solution
If evaporation occurs , volume of solution decreases and moles of solute remains constant . Hence denominator decreases and numerator remains constant .
Hence the molarity increases .
What compound is missing?
3Na2SO4 + 2AlCl3 →+ _____ + 6NaCl
Answer:
Al2(SO4)3
Explanation:
3Na2SO4 + 2AlCl3 →+ Al2(SO4)3 + 6NaCl
if a dog pushes a toy car with 95N of force for 1w meters in 30seconds how much power did he use
Answer:
Hi... If your distance is 1 meters your answer is 95
But if your distance is 12 that you typed wrong, your answer is 12*95=1140
Think about the different methods you used to travel from one place to another today. Describe two of these ways. For each, identify the energy source that caused the movement.
Answer:
An example could be using a car, bicycle, bus, etc.
Explanation:
From there you would identify the energy source as it says and describe them in a pargaraph.
For instance to describe a solar panels' energy. You would say the energy source is heated from the sun.
how many number of molecules are present in 5 moles of methane ch4
Answer:
30 I guess
Explanation:
Venice is ____ of the Adriatic Sea
a - northeast
b - southwest
c - northwest
d- southeast
fill in the blank with one of these ^
226
) Which equation represents the radioactive decay of Ra?
88
Answer:
A
Explanation:
The study of a chemical is called chemistry.
The correct answer is A
Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive.
The radioactive of the Ra is option A that is:-
[tex]RA^{226}_{88}----->Rn^{222}_{86} +He^4_2[/tex].
During the decomposition, the element is breakdown into the neutron, proton, and electron.
Hence, the correct answer is A.
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First Name * hey can some one help
lexi
Last Name *
tomson
Hour
1
2
3
5
7
8
What is density? *
1 point
How much space something takes up
How many particles are in a given space
How much something weighs
What color something is
If something is more dense, what does that mean? *
1 point
The particles are closer together
The particles are further apart
It weighs more
It weighs less
As the air molecules in the balloon and bottle warmed up what happened? *
1 point
They got closer together
They spread further apart
They didn't change at all
The same principles of molecule movement that occurred in the cups also occurred in the balloon and bottle. (Hint: Did the molecules move the same ways?) *
1 point
True
False
What happened to the bubble seal when the bottle was placed in warm/hot water? *
1 point
It popped
It shrank (got smaller)
It expanded (got bigger)
Answer:
1.VOLUME– The amount of space an object takes up. Basic Unit (SI Unit) for Solids – Cubic Meter, m3. LENGTH/DISTANCE – The measurement between two points.
2.one particle per cubic meter.
3.it means it is heavier
4.In a liquid the particles are still close together but a little further apart than in a solid.
5.In gases the particles are much further apart than in solids or liquids.
Explanation:
thats all i can type lol
what is p³×p simplify
Answer:
The answer is p⁴.
Explanation:
You have to apply Indices Law :
[tex] {a}^{m} \times {a}^{n} ⇒ {a}^{m + n} [/tex]
For this question :
[tex] {p}^{3} \times {p}^{1} [/tex]
[tex] = {p}^{(3 + 1)} [/tex]
[tex] = {p}^{4} [/tex]
how to find the number of atoms present in 22g of co2
Answer:
22g of 2
C
O
2
have 3.011×1023
3.011
×
10
23
2
C
O
2
molecules.
Explanation:
Hope this helps! ^^
how many moles of molecules are there in 18 grams of hydrogen. Pls help fast ASAP
Answer:
It is equal to Avogadro's number (NA), namely 6.022 x1023.
Answer:
It is equal to Avogadro's
number (NA), namely 6.022×1023
(08.05 M)
A solution has a [H30) of 1 x 10-3 M. What is the [OH-] of the solution?
11M
14 M
1x 10-14 M
1* 10-11M
The [OH⁻] of the solution : 1 x 10⁻¹¹ M
Further explanationGiven
[H30) : 1 x 10-3 M.
Required
the [OH]
Solution
The water equilibrium constant is a product of the concentrations of [H3O +] and [OH-]
Kw = [H₃O⁺] [OH⁻]
Input the value of [H₃O⁺]
1 x 10⁻¹⁴ = 1 x 10⁻³ x [OH⁻]
[OH⁻] = 1 x 10⁻¹⁴ : 1 x 10⁻³
[OH⁻] = 1 x 10⁻¹¹ M
The population of the United States in 1630 was around 4,500. In 2017, the population was around 326,500,000. What percent increase does this represent?
Answer:
7255455.5%
Explanation:
Giveb that
population in 1630 = 4500
Population in 2017 = 326,500,000
Percentage increase :
((Change in population) / initial population) * 100%
((326,500,000 - 4500) / 4500) * 100%
(326495500 / 4500) * 100%
72554.555 * 100%
= 7255455.5%
A group of Chemistry students have 1.0 mole each of two mystery substances, Substance X and Substance Y, at 50° C. Explain why a conclusion about the kinetic energy of each substance is not possible. (Write in short answer form--- 3-5 sentences)
Answer:
The temperature of a substance in chemistry, is taken as a measure or estimate of the average kinetic energy ([tex]K_{avg}[/tex]) of the atoms or molecules contained in the substance. The 6.02 × 10²³ particles (atoms or molecules) within 1.0 mole of each substance can each posses different amount of kinetic energy at any given time. Some particles move very fast while others move very slow such that the kinetic energy of all the particles are only representable by a distribution and a conclusion regarding the different aspects of the kinetic energy distribution of the particles of the substances is not easily possible
Explanation:
For a gas, we have;
[tex]KE_{avg} = \dfrac{3}{2} \cdot k \cdot T[/tex]
Where;
[tex]KE_{avg}[/tex] = The average kinetic energy
k = 1.38 × 10⁻²³ J/K
T = The gas temperature in Kelvin
Which organisms have greater variation and produce offspring through asexual reproduction?
O A. bacteria
O B. fungi
o C. invertebrates
O D. mammals
Answer: Fungi
Explanation:
Some organisms are able to reproduce their offspring asexually. Bacteria is an example for asexually reproducing organism which is different from the other organisms given.
What is asexual reproduction?Asexual reproduction is type of reproduction which does not involve fusion of of male and female reproductive systems. Asexual reproduction does not involve a change in the number of chromosomes also.
Prokaryotes are organisms with undeveloped nucleus and cells. Prokaryotes such as bacterias reproduce asexually. The method or reproduction in bacteria is called binary fission.
In binary fission a single cell divides into two identical daughter cells and thus multiplies its population. Thus each daughter cell is clone of the parent cell.
All mammals and invertebrates and fungi are reproducing sexually and their metabolic activities are entirely different from prokaryotes such as bacteria. Thus option A is correct.
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What type of chemical reaction is:
S8 + 1202 → 8803
• Decomposition
• Double Displacement
• Synthesis
• Single Discplacement
• Combustion
Answer:
Synthesis
Explanation:
That's the answer to that question
How can a conceptual model be used to develop a testable hypothesis? Select one: a. Conceptual models cannot be used to develop a testable hypothesis. b. Conceptual models help us see how things are related and how they connect or work together. This helps us develop a hypothesis based on changes in a variable and the corresponding response of another variable. c. Conceptual models are never revised once they are made. d. Conceptual models are not based prior observations and are guesses used to generate a hypothesis.
Answer:
b. Conceptual models help us see how things are related and how they connect or work together. This helps us develop a hypothesis based on changes in a variable and the corresponding response of another variable.
Explanation:
A conceptual model refers to a vivid representation or conceptualization of the working of a system. Hence conceptual models offer explanations to ideas about systems.
They help to fit all the facts together so that one can make sense of a system. Also, it helps us to understand how changes in one variable affects the other in a system, thereby helping us to formulate a testable hypothesis.
What happens to the ground particles when they’re hit by sunlight
Answer:
The Earth absorbs most of the energy reaching its surface
Explanation:
a small fraction is reflected. In total approximately 70% of incoming radiation is absorbed by the atmosphere and the Earth's surface while around 30% is reflected back to space and does not heat the surface.
Help, please, I really need it.
Answer:
CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
CTL
Carlos Almanza
ke'
COL TEACHING LEAD
144%
21. Which of the following is not a transformation from chemical energy to thermal
energy?
a, Coal is burned to boil water
b. An electric stove cooking food
C. Food is digested to regulate body temperature
d. Charcoal is burned in a grill
22. During most energy transformations some energy is transformed and released as
which of the following forms of energy?
Iosefa multiplies 8.64 g by 2.0 mL to find the density of the liquid that he has collected in an experiment. How should he report his answer with the correct number of significant figures?
17.3
17
17.28
17.2
The correct number of significant figures : 17
Further explanationGiven
mass = 8.64 g
volume = 2 ml
Required
The density of liquid
Solution
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
The density :
ρ = 8.64 : 2
ρ = 4.32 g/ml
If we want to find density, then the steps should be as above
But if we ignore the density and just want to find the multiplication value to clarify the significant figure, then we must pay attention to the rule of multiplication, that is, the end result of the multiplication has the least significant number of the numbers involved in multiplying.
8.64 = 3 sig fig
2.0 = 2 sig fig
then the product contains 2 sig fig
8.64 x 2.0 = 17.28 rounded to 2 sig fig ⇒ 17
which of the following is an acid?
starch in water
sugar in water
toothpaste in water
vinegar
bleach
How many hydrogen atoms are present in 25.3 g of C3H8 (propane)? How many carbon atoms?
please help :(
Answer:
27.65×10²³ atoms of H
10.37×10²³ atoms of C
Explanation:
Given data:
Mass of C₃H₈ = 25.3 g
Number of hydrogen atom = ?
Number of carbon atom = ?
Solution:
Number of moles of propane:
Number of moles = mass/molar mass
Number of moles = 25.3 g/ 44.1 g/mol
Number of moles = 0.574 mol
1 mole of propane contain 3 mole of carbon atoms.
0.574 moles of propane contain 0.574 × 3 mol = 1.722 moles of C.
1 mole = 6.022 ×10²³ atoms of C
1.722 mole × 6.022 ×10²³ atoms of C / 1 mol
10.37×10²³ atoms of C
Number of atoms of H:
1 mole of propane contain 8 mole of hydrogen.
0.574 moles of propane contain 0.574 × 8 mol = 4.592 moles of H.
1 mole = 6.022 ×10²³ atoms of H
4.592 mole × 6.022 ×10²³ atoms of H / 1 mol
27.65×10²³ atoms of H
Explain in terms of intermolecular forces, why pure hydrogen has a lower boiling point than hydrogen bromide.
Both the pure hydrogen and hydrogen bromide is held by weak intermolecular forces of attaction between molecules. Bromide has larger size of electron cloud than Hydrogen, leading to a greater extent of polarisation of the electron cloud. This results in stronger van der Waals' forces of attraction in hydrogen bromide compared to the pure hydrogen. More energy is required to break the stronger bonds in hydrogen bromide than pure hydrogen, leading to a higher boiling point in hydrogen bromide. Thus, pure hydrogen has a lower boiling point.
Explanation:
the strength of intermolecular forces of attraction rely on the size of the electron cloud. the greater the atomic number, the greater the size of the electron cloud and thus, the stronger the forces of attraction.
When asnwering a qn, you want to first state the structure and bonding of the compound, then compare the size of their electron clouds.
Answer structure:
greater size of electron clouds -> greater extent of polarisation of electron cloud -> stronger van der Waals' forces of attraction -> more energy required to overcome the bonds -> higher boiling point
Pure hydrogen has a lower boiling point than hydrogen bromide due to weak intermolecular forces.
What are intermolecular forces?Intermolecular forces are those forces which binds different molecules all together.
Bromide's electron cloud is larger than Hydrogen's, resulting in more polarisation of the electron cloud. In comparison to pure hydrogen, hydrogen bromide has greater van der Waals forces of attraction. Because the stronger bonds in hydrogen bromide need more energy to break than pure hydrogen, it has a higher boiling point. Pure hydrogen has a lower boiling point as a result.
Hence due to less intermolecular forces hydrogen bromide has a lower boiling point.
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