Answer: 58
Explanation:
Answer:
58
Explanation:
What hypothesis did Redi’s experiment test?
theory of evolution
spontaneous generation
survival of the fittest
cell theory
Answer:
B- Spontaneous Generation
Two organism of different species are not likely to compete for the same
1. Food
2. Mate
3. Space
4.Water
Answer:
Mates
Explanation:
They need all of the other things, but since they are different species, they would not need the same mate
Hope this helped
:)
Two organisms of different species are not likely to compete for the same mate.
WHAT IS COMPETITION?Competition is a kind of relationship in which living organisms harm one another for one reason or the other.
The reasons organisms can compete include the following:
MateFoodWaterSpaceHowever, living organisms of different species cannot compete for the same mate because each organism can only mate with similar species.
Therefore, two organisms of different species are not likely to compete for the same mate.
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which is a form of kinetic energy?
A. gravitational energy
B. chemical energy
c.electrical energy
D.sound energy
how can you use the law of superposition to determine the relative age of rock of layers ?
The law of superposition states that in an undisturbed sequence of rock layers, the oldest layer is at the bottom and the youngest layer is at the top. This principle can be used to determine the relative ages of rock layers.
The law of superposition is based on the observation that sedimentary rocks are formed in horizontal layers over time.
As new layers of sediment are deposited, they accumulate on top of previously deposited layers. Therefore, the sequence of rock layers represents a chronological record of Earth's geological history.
To apply the law of superposition:
1. Identify a sequence of undisturbed sedimentary rock layers.
2. Observe the vertical position of each layer relative to the others.
3. Assign relative ages to the layers, with the bottommost layer being the oldest and each successive layer above it being younger.
For example, consider a cliff face with four distinct rock layers (A, B, C, and D) stacked in the following order from bottom to top:
- Layer D (bottommost)
- Layer C
- Layer B
- Layer A (topmost)
Using the law of superposition, we can determine that Layer D is the oldest, followed by Layer C, then Layer B, and finally Layer A, which is the youngest
This method does not provide an absolute age for the rocks, but it does establish a relative chronological sequence.
To obtain absolute ages, geologists often use radiometric dating techniques on rocks that contain radioactive isotopes. By combining relative dating principles like the law of superposition with absolute dating methods, scientists can construct detailed geological timelines.
How is cytokinesis different in animals and plants?
Group of answer choices
a. Animal cells get pinched into two daughter cells by the cell membrane; the plant cell has to form a cell plate before it can create daughter cells.
b. Animal cells give daughter cells a full set of chromosomes at the time of division; plant cells give daughter cells a half set of chromosomes.
c. Animal cells require an extra growth phase before cytokinesis; plant cells move straight to cytokinesis.
d.Animal cells begin cytokinesis during anaphase; plant cells begin around the same time as telophase.
Cytokinesis in animals involves pinching the cell membrane; in plants, a cell plate is formed and eventually fuses with the cell membrane.
Explanation:The correct answer is option a. In animal cells, cytokinesis occurs through a process called cleavage. The cell membrane pinches inward, eventually separating the parent cell into two daughter cells. In plant cells, cytokinesis occurs through the formation of a cell plate, which forms in the middle of the cell and grows outward until it fuses with the cell membrane, creating two new daughter cells.
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How many molecules are contained in 0.500 moles of hydrogen gas?
A.
1.20 x 1024 molecules
B.
6.02 x 10-23 molecules
C.
3.01 x 10-23 molecules
D.
3.01 x 1023 molecules
There are 3.01 x 10^23 molecules of hydrogen gas in 0.500 moles, calculated by multiplying 0.500 moles with Avogadro's number (6.022 x 10^23 molecules/mole).
Explanation:To find out how many molecules are contained in 0.500 moles of hydrogen gas, we use Avogadro's number, which is 6.022 × 1023 molecules per mole. So, for 0.500 moles of hydrogen gas, we simply multiply:
0.500 moles × 6.022 × 1023 molecules/mole = 3.01 × 1023 molecules of H2
This calculation yields the correct number of molecules, so the answer is:
D. 3.01 × 1023 molecules
An atmospheric scientist used a high-resolution camera to take images of snowflakes during a snowstorm. The scientist observed that the snowflakes were heavily rimed.
What can the atmospheric scientist infer about the snowstorm that was happening at that time?
The storm was deep and shallow.
The storm was deep and turbulent.
The storm was calm and shallow.
The storm was calm and deep.
Answer: B. The storm was deep and turbulent
Explanation: I just took the test
The fact that the snowflakes were heavily rimed shows that the storm was deep and turbulent.
What is a turbulent storm?A turbulent storm is composed of chaotic air movements. A turbulent storm may lead to a lot of damage in its path owing to the force of the advancing storm.
For a deep and turbulent storm, the image taken by the high resolution camera of the environmentalist will show the snowflakes were heavily rimed.
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Name at least 3 ways the Periodic Table is organized. *
Answer:
The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.
Explanation: Cause I'm smart like that!
Answer and Explanation:
There are various ways the periodic table is organized.
One way is by increasing atomic number, which is also the number of protons an element has. As you move to the right and down, the atomic number increases.
Another way is by increasing atomic mass, which is the mass of the element in atomic mass units (amu); this is also numerically equivalent to the molar mass, which is the mass per mole of the element. As you move to the right and down, the atomic mass increases.
Each column is called a group, while each row is called a family. Within the groups/columns, the elements have various properties. For example, Group 1 elements are alkali metals, Group 2 are alkaline-earth metals, Group 17 is halogens, Group 18 is noble gases, etc.
Hope this helps!
The mass of an object is the ___.
A) amount of matter it contains
B) amount of space it takes up
C) amount of water it displaces
D) force of gravity acting on it
Answer:
it's answer A
amount of matter it contains.
Explanation:
the mass is measured by kg
A reaction between liquid reactants takes place at -8.0 C in a sealed, evacuated vessel with a measured volume of 10.0 L. Measurements show that the reaction produced 12 g or carbon dioxide gas. Calculate the pressure of carbon dioxide in the reaction vessel after the reaction. You may ignore the volume of the liquid reactants. Round you answer to 2 significant digits.
Answer : The pressure of carbon dioxide in the reaction vessel after the reaction is, 0.59 atm.
Explanation : Given,
Mass of [tex]CO_2[/tex] = 12 g
Molar mass of [tex]CO_2[/tex] = 44 g/mol
First we have to calculate the moles of carbon dioxide gas.
[tex]\text{Moles of }CO_2=\frac{\text{Given mass of }CO_2}{\text{Molar mass of }CO_2}[/tex]
[tex]\text{Moles of }CO_2=\frac{12g}{44g/mol}=0.273mol[/tex]
Now we have to calculate the pressure of carbon dioxide gas.
Using ideal gas equation:
[tex]PV=nRT[/tex]
where,
P = pressure of gas = ?
V = volume of gas = 10.0 L
n = number moles of gas = 0.273 mol
R = gas constant = 0.0821 L.atm/mol.K
T = temperature of gas = [tex]-8.0^oC=273+(-8.0)=265K[/tex]
Now put all the given values in the above formula, we get:
[tex]P\times (10.0L)=(0.273mol)\times (0.0821L.atm/mol.K)\times (265K)[/tex]
[tex]P=0.59atm[/tex]
Therefore, the pressure of carbon dioxide in the reaction vessel after the reaction is, 0.59 atm.
Which physical property of matter depends on the pull of gravity?
A) density
B) volume
C) weight
D) mass
The physical property possessed by the matter that can depend on the pull of gravity is weight. Hence, option C is correct.
What is gravity?Gravity can be given as the force exerted by a body, in order to attract it towards itself. In other words, it can be given as the pulling force exerted by a body.
The gravitational force of the earth was given by Issacs Newton, which describes the earth as a gravitational force that allows matter over the surface of the earth.
The object that occupies space, and comprises of a measurable amount of mass has been a matter. The mass of the matter has been the absolute measure of the atoms, while the weight of the matter has been the mass of the matter experienced after the pull of gravity.
Therefore, the property of matter that has been dependent on the pull of gravity is weight. Hence, option C is correct.
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What feature appears at point A on the topographic map?
depression
swamp
road
school
Answer: B: swamp
Explanation:
Have faith in me:)
Answer:
b. swamp
Explanation:
i just got it right
Use the drop-down menus to determine which percentage is equal to each fraction.
Answer: these are the answers i got.
Answer:
1/4: 25 3/4: 75 4/4: 100 2/4: 50
Explanation:
I already did it and those were the correct answers
A chemical reaction is carried out in a closed container. The energy absorbed by the chemical reaction is 150 kJ.
How much energy moves inward from the air or the walls of the container?
A. 75 kJ
B. 100 kJ
C. 150 kJ
D. 200 kJ
Answer:
The correct answer is 150 kJ.
Explanation:
As per Law of Conservation of Energy, energy can neither be created nor destroyed, it can only change from one form to another.
If a chemical reaction absorbs 150 kJ and all the energy that is being absorbed is neither created nor destroyed, then it means all the energy absorbed comes from the surroundings (Air, wall of container etc).
Source from which organisms benefit
A. Ecosystem
B. Organism
C. Competition
D. Population
E. Resources
Answer:
a ecosystem
Explanation:
Organisms benefit from the ecosystem, including the resources provided by it and the competition among individuals for those resources.
Explanation:In biology, the source from which organisms benefit is Ecosystem. An ecosystem is a community of organisms interacting with each other and their environment. Organisms obtain various benefits from the ecosystem such as food, shelter, and resources necessary for survival.
For example, in a forest ecosystem, plants provide food and oxygen for animals, while animals help in pollination and dispersing seeds to help plants reproduce.
The population of organisms in an ecosystem can also benefit from each other through Competition, where individuals compete for limited resources like food, water, and mates.
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What is the rate of a reaction if the value of k is 3 and A and B are each 2 M Rate kA2B?
Answer:
Rate= 24
Explanation:
Rate = k[A]^2[B]
k= 3, [A]=2M, [B]=2M
Rate= 3×(2)^2×2= 24
Substitute into above
Which sentence describes the bond formed between two identical atoms?
O
A. One atom has donated an electron to another.
O
B. The electrons involved in the bond are shared equally between the
atoms.
C. The electronegativity of the atoms determines the type of bond it
is.
) D. The bond is very unstable because there is no electrostatic
attraction.
Answer:
its B on Ap ex
Explanation:
Just got it wrong -_- it's B
The electrons involved in the bond are shared equally between the
atoms. Hence, option B is correct.
What is a covalent bond?A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.
A covalent bond in chemistry is a chemical link between two atoms or ions in which the electron pairs are shared between them.
A covalent bond may also be termed a molecular bond.
Covalent bonds form between two nonmetal atoms with identical or relatively close electronegativity values.
Hence, option B is correct.
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Does an object that feels cold to the touch contain thermal energy
Answer:
Yes it does contain thermal energy.
Explanation:
Cold objects have SOME thermal energy because the particles of all matter are in constant random motion.
Thermal energy is the amount of energy that is held by s system that is responsible for its temperature.
The object feels cold to touch when to consist of thermal energy is due to the fact that particles of matter are in a constant motion. It has thermal energy but at a lesser amount. For example, the hot desert has more thermal energy due to the heat content and temperature.Hence yes a cold object has thermal energy.
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how many grams of caf2 are present in 1.25 l of a 0.15 m solution of caf2
Answer:
9.36g of CaF2 is presnt in the solution.
Explanation:
CaF2 molar concentration is 0.15mol in 1.25l of solution.
1. Convert this to the standard concentration in mol/dm3:
1dm3 = 1 L
0.15mol = 1.25 dm3
x =1 dm3
0.15 = 1.25 x
x = 0.15/1.25
x = 0.12 mol/dm3
2. Calculate the relative molecular mass of CaF2
Ca= 40, F =19
RMM = 40 + 19 *2
RMM = 40+ 38
RMM = 78g/mol
3. Calculate the concentration in g/dm3
conc. in mol/dm3 = conc in g/dm3 / RMM
conc in g/dm3 = conc in mol/dm3 * RMM
= 0.12mol/dm3 * 78g/mol
= 9.36 g/dm3
So therefore, 9.36g of CaF2 is presnt in the solution.
Which of these did your answer include?
Each hydrogen atom is bonded to the oxygen atom with a single bond.
The oxygen atom has two lone pairs.
The molecule is bent.
Oxygen is more electronegative than hydrogen.
Each O-H bond is polar.
The molecule is asymmetrical.
The asymmetry and the polar bonds produce an overall molecular dipole.
The oxygen atom has a partial negative charge, and the hydrogen atoms have a partial positive
charge.
DONE
Intro
Answer:
i) Each Hydrogen atom is bonded to the oxygen atom with a single bond.
ii) The oxygen atom has two lone pairs.
iii) The molecule is bent.
iv) Oxygen is more electronegative than hydrogen.
v) Each O-H bond is polar.
vi) The oxygen atom has partial negative charge, and the hydrogen atoms have a partial positive charge.
NOTE: Above given points are correct and described by keeping in view the molecule of water.
Question 4
When pure water and sodium chloride combine, what do they create?
A. Another pure substance
B. A mixture
C. A chemical change
D. Not enough information is given.
Answer:
la respuesta es a.another pureza substance
When pure water and sodium chloride combine, they create a chemical change and form sodium hydroxide and hydrogen chloride. option C is correct.
What is pure water?Pure water is also known as distill water the concentration of hydroxyl ions and hydronium ions are equal in the pure water the pH of the solution 7 and it is neutral in nature.
While adding something to it the ions of HOH gets dissociate and will be on H+ and OH- and the other chemical species forms bond with it into their constituent ions.
In pure water as sodium chloride is added to it it forms sodium hydroxide and hydrogen chloride
HOH + NaCl will give NaOH sodium hydroxide and HCl hydrogen chloride they form two different chemicals change with it.
Therefore, pure water and sodium chloride combine, they create a chemical change and form sodium hydroxide and hydrogen chloride. option C is correct.
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A molecule made of a nitrogen base, sugar, and a phosphate
Answer:
DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base.
They also have four types of nitrogen bases that are adenine, thymine, guanine, and cytosine aka (A), (T), (G), and (C)
Final answer:
A nucleotide is a molecule made of a nitrogen base, sugar, and a phosphate group, serving as the monomeric unit of nucleic acids like DNA and RNA. The structure includes a nitrogenous base, a pentose sugar, and a phosphate group, which forms the DNA double-helical structure.
Explanation:
The molecule in question, which is composed of a nitrogen base, sugar, and a phosphate group, is known as a nucleotide. Nucleotides are the building blocks of nucleic acids like DNA and RNA. The structure of a nucleotide includes three parts: a nitrogenous base that is an aromatic compound containing nitrogen, a pentose (five-carbon) sugar, which is deoxyribose in DNA and ribose in RNA, and a phosphate group. These nucleotides combine to form long chains, or polymers, called polynucleotides, which are the backbone of the DNA double-helical structure and RNA.
In the DNA double-helical structure, each nucleotide's sugar molecule is attached to a phosphate group and a nitrogen-containing base. Through the formation of phosphodiester bonds between adjacent nucleotides, a stable backbone of alternating sugars and phosphates is established, with the nitrogenous bases projecting inward. The specific arrangement of these bases carries genetic information and is critical for the process of genetic inheritance.
What is the Molar mass of Na3P
Answer:
99.943071 g/mol
Explanation:
22.98977*3+30.973761
The molar mass of Na₃P is calculated by summing the atomic masses of three sodium atoms and one phosphorus atom, resulting in a total molar mass of 99.94 g/mol.
To find the molar mass, we sum up the atomic masses of all atoms in the compound. Sodium (Na) has an atomic mass of approximately 22.99 u (units), and Phosphorus (P) has an atomic mass of approximately 30.97 u. As the compound consists of three sodium atoms and one phosphorus atom, its molar mass can be calculated as follows:
Molar mass of Na = 22.99 u 3 li> atoms of Na = 3 li> (22.99 u) = 68.97 uMolar mass of P = 30.97 uTherefore, the total molar mass of Na₃P is:
68.97 u (for Na) + 30.97 u (for P) = 99.94 u
Hence, the molar mass of Na₃P is 99.94 g/mol.
Calcium Carbonate has solubility product constant (Ksp) of 3.3 x 109
Would you consider this solid to be very soluble in water? Explain why or why not.
Answer:
no
Explanation:
bc no shshshhshsdhddhhdhdhdhf
If 27.5 mL of 16.0 M nitric acid stock solution is added to 300. mL of water, what is the molarity of the diluted solution?
Final answer:
The molarity of the diluted solution after adding 27.5 mL of 16.0 M nitric acid stock solution to 300 mL of water is 1.34 M.
Explanation:
The student is asking about how the molarity of a nitric acid solution changes after dilution. To find the molarity of the diluted solution, we use the formula M1V1 = M2V2, where M1 and V1 represent the molarity and volume of the concentrated solution, and M2 and V2 represent the molarity and volume of the diluted solution.
In this case, the initial concentration (M1) is 16.0 M and the initial volume (V1) is 27.5 mL. The final volume (V2) after dilution is the sum of the volume of the stock solution plus the volume of water added, which is 27.5 mL + 300 mL = 327.5 mL. We are solving for the final concentration (M2).
Applying the dilution formula: (16.0 M) × (27.5 mL) = M2 × (327.5 mL). Dividing both sides of the equation by 327.5 mL, we get M2 = (16.0 M × 27.5 mL) / 327.5 mL.
Performing the calculation:
M2 = (16.0 × 27.5) / 327.5
M2 = 1.34 M, which is the molarity of the diluted solution.
A gas is at a pressure of 12.5 psi and a volume of 750 mL. What volume will the gas occupy at a pressure of 18 psi?
Answer : The volume of gas occupy at a pressure of 18 psi is, 520.8 mL
Explanation :
Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}[/tex]
or,
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1[/tex] = initial pressure = 12.5 psi
[tex]P_2[/tex] = final pressure = 18 psi
[tex]V_1[/tex] = initial volume = 750 mL
[tex]V_2[/tex] = final volume = ?
Now put all the given values in the above equation, we get:
[tex]12.5psi\times 750mL=18psi\times V_2[/tex]
[tex]V_2=520.8mL[/tex]
Thus, the volume of gas occupy at a pressure of 18 psi is, 520.8 mL
Which form of energy is increasing as a car drives up a hill?
Select one:
Potential
Kinetic
Chemical
Thermal
Answer:
Kinetic
Explanation:
Which of the following is not a physical property of elements?
solubility
ductility
combustibility
o malleability
be
Answer:combustibility
Explanation
Answer:
Answer: combustibility
Explanation:
Identify the decomposition reaction.
2NH 3 + H 2SO 4 ⟶ (NH 4) 2SO 4
3Pb + 2H 3PO 4 ⟶ 3H 2 + Pb 3(PO 4) 2
2 NO 2 ⟶ 2 O 2 + N 2
2NaBr + Ca(OH) 2 ⟶ CaBr 2 + 2NaOH
Answer:
2 NO2 ⟶ 2 O2 + N2
Hope this helped!
Explanation:
Which of the following motions is least like an earthquake wave?