Answer:
d
Explanation:
stop answering people questions and not actually helping them typing random stuff like i just did here
It describes DNA passed from parent to offspring as the driving force of evolution.
What is evolution?
The basic idea of biological evolution is that populations and species of organisms change over time. Today, when we think of evolution, we are likely to link this idea with one specific person: the British naturalist Charles Darwin.In the 1850s, Darwin wrote an influential and controversial book called On the Origin of Species. In it, he proposed that species evolve (or, as he put it, undergo "descent with modification") and that all living things can trace their descent to a common ancestor.Darwin defined evolution as "descent with modification," the idea that species change over time, give rise to new species and share a common ancestor. The mechanism that Darwin proposed for evolution is natural selection.
therefore option D is the correct answer.
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The pressure on 30 milliliters of an ideal gas increases from
760 torr to 1520 torr at constant temperature. The new volume is
V1 = 30 mL
P1 = 760 torr
P2 = 1520 torr
V2 = ?
applying Boyle's Law
P1*V1 = P2*V2
760 torr * 30 mL = 1520 torr * V2
V2 = 760 torr * 30 mL / 1520 torr
( C ) is correct
Choose all the materials that S-waves cannot travel through.
-water
-solid rock
-sand
-molten rock
-gas
Answer:
water
Explanation:
liquid don't have any shear strength and so a shear wave cannot propagate through a liquid.
A student wants to make 50-mL of a 0.6 mg/L solution of acetic acid. She will be making the solution by diluting a stock with a concentration of 2.0 mg/L. Put the steps for her dilution in order. 4. Cap the flask and invert several times to mix. 2. Fill the volumetric flask with deionized water until the meniscus touches the mark. 6. Swirl the flask to mix the contents. 1. Obtain a 50-mL volumetric flask. 3. Use a pipet to add the appropriate volume of stock solution to the flask. 2. Add approximately 10 mL of deionized water to the empty flask.
Answer:
The steps in order are;
1. Obtain a 50-mL volumetric flask
2. Add approximately 10 mL of deionized water to the empty flask
3. Use a pipet to add the appropriate volume of stock solution to the flask
4. Cap the flask and invert several times to mix
5. Fill the volumetric flask with deionized water until the meniscus touches the mark
6. Swirl the flask to mix the contents
The volume of the acetic acid to be added to the solution is 15 mL
Explanation:
The given steps are;
4. Cap the flask and invert several times to mix
5. Fill the volumetric flask with deionized water until the meniscus touches the mark
6. Swirl the flask to mix the contents
1. Obtain a 50-mL volumetric flask
3. Use a pipet to add the appropriate volume of stock solution to the flask
2. Add approximately 10 mL of deionized water to the empty flask
The given parameters are;
The volume of the volumetric flask = 50-mL
The concentration of the final solution of acetic acid = 0.6 mg/L
The concentration of the stock solution = 2.0 mg/L
Let 'x' represent the volume of the stock solution added, we have;
2.0 mg/L·x + (50 - x)×0 = 0.6 mg/L × 50-mL
x = 0.6 mg/L × 50-mL/(2.0 mg/L) = 15 mL
The volume of the stock solution to be added, x = 15 mL
is CH3CH2COOCH2 an aldehyde structure?
11. How many moles of O2 can be produced by letting 12.00 moles of
KCIO3 react?
2KCIO2 → 2KCI + 30,
A. 18 mol 02
B. 36 mol 02
C. 1.5 mol 02
D. 6 mol 02
Answer:
Molarity of the solution = 0.08 M
Further explanation
Molarity is a way to express the concentration of the solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
Where
M = Molarity
n = Number of moles of solute
V = Volume of solution
0.5 lb=226,796 g
MW silver nitrat - AgNO₃ = 169,87 g/mol
mol AgNO₃ :
Molarity :
Which of the following is TRUE about a physical change to a substance?
A.
The atoms in a substance will divide.
B.
The mass of a substance will increase.
C.
New substances will likely be formed.
D.
The substance will have the same chemical properties.
Answer:
D.
The substance will have the same chemical properties.
Explanation:
Physical changes do not alter the chemical composition of a substance, so the chemical properties will not change.
Using the fact that at 0.10 M, the absorbance was 0.357; and at 0.20 M, the absorbance was 0.714, the absorptivity (slope) is
Blank 1
(answer to 2 dec places). Using your absorptivity, if an absorption of 0.250 is measured, the concentration is
Blank 2
M (answer to 2 dec places)
Answer:
The answer is "3.57 and 0.07".
Explanation:
Using the slop formula:
[tex]=\frac{n_2-n_1}{n_2-n_1}\\\\ =\frac{0.714-0.357}{0.20-0.10} \\\\ = ABSORPTIVITY, \ \ a=3.57 \\\\A= a\times b \times c[/tex]
Given:
[tex]A=0.250[/tex]
length path [tex]b=1[/tex]
from calibration it is found that
[tex]a=3.57\\\\consentation \ c=\frac{A}{a\times b} \\\\C=\frac{0.250}{3.57\times 1}[/tex]
[tex]=0.07 \ M[/tex]
Hi! I wanted to know what my grade would be for my test. There are 23 questions in total. 2 of the 23 questions are essay questions that are worth 4 points each. I got two questions wrong that were worth 1 point each. Thank you!!
Answer:
high B or a low A:) Good Luck
Explanation:
The pendulum has the greatest kinetic energy and no potential energy when it is _____.
swinging upward
at the top of the swing
at the bottom of the swing
swinging downward
Answer:
At the top of the swing
Explanation:
Which of the following general trends are true for the atomic mass of elements in the periodic table?
1. The atomic mass is usually a decimal number.
II. The atomic mass is always smaller than the atomic number.
III. The atomic mass increases from top to bottom down a group.
IV. The atomic mass increases from left to right across a period.
HELP PLEASE THERE IS NO PICTURE PLZ JUST LEAVE THE ANSWER!!
Answer:
D. the atomic mass increases from left to right
Explanation:
I can't leave till I answer please help!!
Answer:
The answer is 2 all you do is divide the 6.02 and 3.01 and you get 2
a large molecule made up of smaller molecules called amino acids
ATP
carbohydrate
lipid
protein
phospholipid
nucleic acid
Answer:
Protein
Explanation:
how does wind energy combined with machines cause a sailboat to move?
marking as brainliest
Answer:
The wind pushes the sails from behind, causing the boat to move forward.
Answer:
Wind energy obtained by the machine is converted into kinetic energy as it functions and thus enabling the boat to move.
Together, the forces of drag, from the water, and the pressure from the wind against the sail itself push the craft forward. Angling too sharply into the wind causes the forces on the boat to become unbalanced, and moves the boat sideways in the water.
Meiosis does PMAT twice! That means there is prophase I and prophase II. There is metaphase I and metaphase II. If the cartoon below has chromosomes in the middle of the cell, how would you know whether it was in metaphase I or metaphase II?
Answer:
- there are homologous chromosomes in the middle of the cell (metaphase I)
- there are sister chromatids in the middle of the cell (metaphase II).
Explanation:
Who coined the term "ridgeology"?
Answer:
David R. Ashbaugh
Explanation:
David R. Ashbaugh is a Canadian police officer known for his extensive research on the friction ridge identification, introducing for the first time the use of the term ridgeology in forensic identification and the ACE-V methodology.
PLZ help me out!
Which changes are environmental effects of farming?
Select ALL correct answers.
(A.) increased carbon dioxide levels
(B.) habitat loss
(C.) soil erosion
(D.) desert formation
Answer:
the answer is C, B, and D
Explanation:
I took the test and got it right
Habitat loss and Soil erosion are environmental effects of farming and the correct options are option B and C.
What are Environmental effects of farming?
Environmental changes are likely to affect agricultural production over the next decades. The interactions between environmental change, agricultural yields and crop quality, and the critical pathways to future diets and health outcomes are largely undefined.
Agriculture contributes to a number larger of environmental issues that cause environmental degradation including: climate change, deforestation, biodiversity loss, dead zones, genetic engineering, irrigation problems, pollutants, soil degradation, and waste.
Therefore, Habitat loss and Soil erosion are environmental effects of farming and the correct options are option B and C.
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What organ is known as the windpipe and the tube takes in air ?
Answer:
The trachea, commonly known as the windpipe, is a tube about 4 inches long and less than an inch in diameter in most people. The trachea begins just under the larynx (voice box) and runs down behind the breastbone (sternum).
Explanation:
2K + 2H20 - 2KOH + H2
How much hydrogen gas will be formed by reacting 65 g water?
Answer:gc
Explanation:
vanadium (IV) carbonate
tin (II) nitrite
cobalt (III) oxide
titanium (II) acetate
vanadium (V) sulfide
chromium (III) hydroxide
lithium iodide
lead (II) nitride
silver bromide
i just need the compounds
Answer:
Explanation:
1) Vanadium (IV) → V⁺⁴
Carbonate → CO₃⁻²
So , Vanadium (IV) Carbonate = V₂(CO₃)₄ or V(CO₃)₂
2) Tin (II) = Sn⁺²
Nitrite = NO₂⁻
So, Tin (II) Nitrate = Sn(NO₂)₂
3) Cobalt (III) = Co⁺³
Oxide = O⁻²
So , Cobalt (III) Oxide = Co₂O₃
4) Titanium (II) = Tn⁺²
Acetate = CH₃COO⁻
So , Titanium (II) Acetate = Tn(CH₃COO)₂ or Tn(C₂H₃O₂)₂
5) Vanadium (V) = V⁺⁵
Sulfide = S⁻²
So , Vanadium (V) Sulfide = V₂S₅
6) Chromium (III) = Cr⁺³
Hydroxide = OH⁻
So , Chromium (III) Hydroxide = Cr(OH)₃
7) Lithium = Li⁺
Iodide = I⁻
So , Lithium Iodide = LiI
8) Lead (II) = Pb⁺²
Nitride = N⁻³
So , Lead (II) Nitride = Pb₃N₂
9) Silver = Ag⁺
Bromide = Br⁻
So , Silver Bromide = AgBr
Which word is described by this description?
A tool scientists use to measure earthquake activity.
A shield
B magma chamber
C seismograph
D Richter scale
PLEASE
Why don't the particles in a solid move past one another?
A. They have no motion and cannot even vibrate in place.
B. They don't have enough energy to overcome the attractions
between them.
C. They bounce off the walls of their container and back into place.
D. They move independently of one another.
Answer:
B. They don't have enough energy to overcome the attractions between them.
Answer:They don't have enough energy to overcome the attractions
between them.
Explanation:
A. They have no motion and cannot even vibrate in place.
B. They don't have enough energy to overcome the attractions
between them.
C. They bounce off the walls of their container and back into place.
D. They move independently of one another.
The balanced chemical equation for the reaction of nitrogen (N2) and hydrogen (H) to form ammonia (NH3) is given below.
N2+ 3H2 + 2NH3
How many grams of hydrogen would be to react with 14.0 g of nitrogen?
Answer:
V= 33.6L
Explanation:
The reaction between hydrogen and nitrogen is
3H2(g) + N2(g) + 2NH3(g)
BRAINLIEST! A reaction is set up between magnesium and hydrochloric acid. After 30 seconds, the magnesium had decreased in mass by 45g. What was the rate of this reaction?
Answer:
Acidic oxides, or acid anhydride, are oxides that react with water to form an acid, or with a base to form a salt. They are oxides of either nonmetals or of metals in high oxidation states.
Explanation:
What are three ways a driver can cause a car to accelerate?
A. Turn the key in the ignition while the car is stopped.
B. Turn the steering wheel while the car is moving.
C. Press the gas pedal while the car is stopped.
D. Press the brake pedal while the car is moving.
The correct answer is:
C. Press the gas pedal while the car is running.
A driver can cause a car to accelerate by pressing the gas pedal.
What is Acceleration?
Acceleration is the rate at which an object's velocity changes over time. It is a vector quantity that includes both the magnitude (or speed) and direction of the change in velocity. In simpler terms, acceleration refers to the rate at which an object speeds up or slows down, or changes its direction of motion.
Acceleration is caused by forces acting on an object, such as a push or pull. In the case of a car, pressing the gas pedal causes the engine to generate more power and push the car forward, resulting in an increase in velocity and acceleration. Conversely, pressing the brake pedal causes the car to slow down and decelerate.
The gas pedal controls the amount of fuel and air that is delivered to the engine, which in turn determines how fast the engine runs and how much power it generates. Other factors that can affect a car's acceleration include the car's weight, the condition of its engine and transmission, the road surface and gradient, and the driver's skills and techniques.
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How does the ocean
currents affect weather?
Explanation:
Ocean currents act as conveyer belts of warm and cold water, sending heat toward the polar regions and helping tropical areas cool off, thus influencing both weather and climate.Land areas also absorb some sunlight, and the atmosphere helps to retain heat that would otherwise quickly radiate into space after sunset.The ocean doesn't just store solar radiation; it also helps to distribute heat around the globe. When water molecules are heated, they exchange freely with the air in a process called evaporation. Ocean water is constantly evaporating, increasing the temperature and humidity of the surrounding air to form rain and storms that are then carried by trade winds. In fact, almost all rain that falls on land starts off in the ocean. The tropics are particularly rainy because heat absorption, and thus ocean evaporation, is highest in this area.
What is the electronegativity difference between sodium and chlorine? What type of bond is this?
Answer:
Sodium chloride is ionically bonded. An electron has transferred from sodium to chlorine. Sodium has an electronegativity of 1.0, and chlorine has an electronegativity of 3.0.
...
The electronegativity difference between sodium and chlorine is 2.23 and the type of bond is ionic bond.
What is electronegativity?The tendency of an atom in a molecule to attract the shared pair of electrons towards itself is known as electronegativity.
Electronegativity is a kind of measure that tells how strongly atoms attract the bonding electrons to them.
Its symbol is a Greek letter that looks like an (X). It is directly proportional to the atom’s attraction for the electrons.
The compounds which form between the elements having a huge difference in the electronegativity are ionic compounds, and also have ionic bonding.
Electronegativity of Sodium = 0.93
Electronegativity of chlorine = 3.16
Difference = 2.23
The type of bond between them is ionic bond.
Therefore, The electronegativity difference between sodium and chlorine is 2.23 and the type of bond is ionic bond.
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2NazN + 3MgO -> Mg3N2 + 3Na2O, what is the mole ratio of magnesium oxide to magnesium nitride?
Answer:
3:1 or 3/1
Explanation:
Look at the coefficients then set up ratio. Simplify to the base numbers and you get 3/1 or 3:1. Thus, for every 3 MgO you produce 1 Mg3N2
61.3 g of dinitrogen tetraoxide will decompose into how many grams of NO2? (brainliest answer if you help with both the questions please)
Answer:
12.56 moles
Explanation:
How much heat must be added to a 12.75 g sample of gold to increase its temperature
from 32.5°C to 85.5°C? The specific heat of gold is 0.13 J/gºC.
Report your answer with the proper number of SF with a space between your numeral
answer and units.
Answer: This is a link to all of the awsers
https://pshs.psd202.org/documents/ssafe/1552416190.pdf
Explanation:
10. Lead nitrate solution mixed with sodium sulfate solution forms lead sulfate as a
precipitate.
Pb(NO3)2+ Na2SO4-
PbSO4+ 2NaNO3
In an experiment, the theoretical yield of lead sulfate for this reaction was 2.85 g.
In the experiment only 2.53 g of lead sulfate is obtained.
Calculate the percentage yield of lead sulfate in this experiment. * IT
Answer:
88%.
Explanation:
The percentage yield of lead sulfate in this experiment is 88% if 2.53 is divided by 2.85 and multiply by 100. The percentage yield can be calculated when the experimental yield is divided by theoretical yield and then multiply by 100. The percentage yield tells us about the actual yield that is gained in the end of experiment which is lower than theoretical yield.