Help!!! I need ur help! If u help me I’m going to be so happy. The question is so tricky for me and I don’t know it. If u help me I’m going to be so thankful. ( if that makes sense )
I take that the insects remain constant no matter what happens to the frogs (which the frogs eat presumably). So a constant food supply for the frogs is not the problem.
The line for the alligators increases over time. It their numbers increase, the frogs are in trouble. The alligators will pursue lunch with determined single mindedness and there are more of them around.
So the frogs should decrease. Their natural enemy is the alligator and alligators won't go after insects. It's not worth their time.
A is the only answer you can choose.
Isabel’s first car had a manual stick shift. After many years of driving an automatic car, she needs to use her sister’s car, which also has a stick shift. Isabel takes a few minutes to get used to shifting gears. Which memory system is she using to recall this information?
The answer would be procedural memory
Answer: Isabel has to recall the information about using a manual stick shift. For this reason, she is using long-term, explicit, declarative and episodic memory system.
Human memory system can be broadly classified as: sensory memory, short-term memory and long-term memory.
Long-term memory is used to recall information. If the information are about facts, events and experiences then explicit, declarative and episodic memory helps to recall all information. This will help Isabel to recall all information about driving a car with a manual stick shift and she will be able to drive her sister's car.
Isabel is using her procedural memory system to recall the information needed to operate a manual stick shift car. Procedural memory is a type of long-term memory that stores information about how to perform various skills and tasks, including those that involve motor skills and sequences of actions.
In this case, Isabel has previously learned how to operate a manual transmission car, and this knowledge is stored in her procedural memory. However, after many years of driving an automatic car, the specific motor skills and sequential actions required to shift gears in a manual car may have become less automatic for her.
When she gets into her sister's car with a manual transmission, she needs a few minutes to reacquaint herself with the physical movements and coordination required to shift gears. During this process, she is accessing her procedural memory to retrieve the previously learned information about operating a manual stick shift, and her brain is working to reestablish the neural pathways and muscle memory associated with this skill.
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Which of these elements elements has an electron configuration of [Kr]5s2
Your answer is strontium
Pls assist if you can.
Reasons why hydrogen was chosen as a standard reference to other elements
Answer:
See below
Step-by-step explanation:
Hydrogen either reacts with or is formed by reactions with many other elements, so chemists could use it directly to determine their relative masses. Hydrogen has the smallest atomic mass, so it was convenient to give H a relative atomic mass of 1 and assign those of other elements as multiples of this number.The O = 16 scale became the standard in 1903 and carbon-12 was chosen in 1961.
PLEASE HELP ASAP 50 POINTS!!!
(only answer if you know for sure, please and ty)
The atomic number of an atom is the number of ____.
A.protons
B.neutrons
C.electrons and neutrons combined
D.protons and neutrons combined
An ion is an atom ____.
A. That has the same number of protons and electrons.
B. That has an unequal number of protons and electrons.
C. That has an unequal number of protons and neutrons.
D. That has the same number of protons and neutrons.
Which of the following is true regarding photosynthesis and respiration?
A. All cells can undergo both photosynthesis and respiration.
B. Photosynthesis occurs in the chloroplasts; respiration occurs in the mitochondria.
C. Photosynthesis breaks down glucose; respiration makes glucose.
D. Photosynthesis occurs in the mitochondria; respiration occurs in the chloroplasts.
The atomic number of an atom is the number of A.protons An ion is an atom D. That has the same number of protons and neutrons.
Which of the following is true regarding photosynthesis and respiration? C. Photosynthesis breaks down glucose; respiration makes glucose. hope this helps
1. The atomic number of an atom is the number of protons in the nucleus.
2. An ion is an atom that has an unequal number of protons and electrons.
3. Photosynthesis occurs in the chloroplasts; respiration occurs in the mitochondria.
true or false: energy can change from one form to another.
True!
Energy can change from Potential to Kinetic and so on.
This is actually called energy transformation!
For the following chemical reaction, how many moles of hydrogen (H2) will be produced from 2.0 mol of aluminum (Al)? 2Al+3H2SO2⟶3H2+Al2(SO2)3
In the given chemical reaction, 3.0 moles of hydrogen will be produced from 2.0 moles of aluminum.
Explanation:In the given chemical reaction:
2Al + 3H2SO2 ⟶ 3H2 + Al2(SO2)3
We can see that 2 moles of aluminum (Al) react to produce 3 moles of hydrogen (H2). Therefore, if we start with 2.0 mol of aluminum, we can calculate the moles of hydrogen produced as follows:
2.0 mol Al x (3 mol H2 / 2 mol Al) = 3.0 mol H2
So, 3.0 moles of hydrogen will be produced from 2.0 moles of aluminum.
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For the chemical reaction 2Al + 3H₂SO₄ rightarrow Al₂(SO₄)₃ + 3H₂, 2.0 moles of aluminum will produce 3 moles of hydrogen gas.
Moles of hydrogen (H₂) will be produced from 2.0 mol of aluminum (Al) in the reaction with sulfuric acid. According to the balanced chemical equation 2Al + 3H₂SO₄ rightarrowAl₂(SO₄)₃ + 3H₂, 2 moles of aluminum produce 3 moles of hydrogen gas.
Using stoichiometry, we can set up a ratio from the coefficients in the balanced equation: 2 moles of Al : 3 moles of H₂. Therefore, if we start with 2.0 moles of Al, we will produce 3 moles of H₂.
Here's the calculation:
(2.0 moles Al)*(3 moles H₂ / 2 moles Al) = 3 moles H₂.
How many electrons are in a neutral atom of lithium
Answer:
Lithium has an atomic number Z of 3, so by definition, it has 3 protons. Hence, neutral lithium atoms must contain 3 electrons.
Explanation:
A neutral atom of lithium contains 3 electrons.
The number of electrons in a neutral atom is equal to its atomic number. The atomic number of an element represents the number of protons in its nucleus, and since atoms are electrically neutral (having no net charge), the number of electrons in the atom is also equal to the number of protons.
For lithium (Li), you can find its atomic number on the periodic table, which is 3. This means that lithium has 3 protons in its nucleus, and therefore, it also has 3 electrons to balance the positive charge of the protons. In a neutral atom, the number of electrons equals the number of protons, making lithium, with its 3 electrons, an electrically neutral atom.
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What is the solar mass of CHCI3?
Molar mass of CHCl3 is
sum of atomic mass of all the atoms in it.
= C + H + 3 Cl
= 12.0107 + 1.008 + 3 (35.453) = 2.0107 + 1.008 + 106.359
= 119.38 g/mol
Molar mass of CHCl3 is 119.38 g/mol
Help ASAP!
Which of the following represents the average kinetic energy of an object’s particles?
A.) Potential energy
B.) Thermal energy
C.) Type of atoms in matter
D.) Type of molecules in matter
I believe the answer is D
The average kinetic energy of an object's particles is represented by the Thermal Energy. It is a measure of how fast the particles within an object are moving. Therefore the more thermal energy an object has, the higher the average kinetic energy of its particles.
Explanation:The average kinetic energy of an object's particles is represented by Thermal Energy. Kinetic energy is the energy of motion. For a single particle, it is given by the formula 1/2 mv^2 where m is the mass and v is the velocity of the particle. When we talk about particles in an object, the average kinetic energy of all these moving particles is referred to as the thermal energy.
The more thermal energy an object has, the faster its particles are moving and therefore the higher the average kinetic energy of its particles.
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Count the number of molecules in the diagram of water formation given in the lesson to complete the following reaction.
______H2 + ________O2 → _______H2O
A: 1
B: 2
C: 3
The answer is 2
2H2 + 2O2 -2H2O
2 H2 + 1 O2 = 2 H2O
B. 2 is the correct option
which allows psychologists and psychiatrists to diagnose mental disorders in patients?
A. DSM
B. TAT
C. MMPI
D. Manual of Abnormalities
I think it is A. DSM
Psychologists and psychiatrists use the Diagnostic and Statistical Manual of Mental Disorders (DSM) to diagnose mental disorders, with the current version being DSM-5, published by the American Psychiatric Association in 2013.
Psychologists and psychiatrists diagnose mental disorders in patients using the Diagnostic and Statistical Manual of Mental Disorders (DSM). This manual provides a comprehensive set of criteria for diagnosing various mental health conditions.
It includes detailed descriptions of each disorder, diagnostic criteria, prevalence information, and associated risk factors. The DSM is not only utilized by mental health professionals but also by researchers, health insurance companies, and policymakers. Developed and published by the American Psychiatric Association, the DSM has undergone several revisions, with the most recent edition being DSM-5, released in 2013.
The correct answer to the question of which tool allows professionals to diagnose mental disorders is D. Diagnostic and Statistical Manual of Mental Disorders.
differentiate between crystalline and amorphous solid.
1) Amorphous means “without form or structure".
In amorphous solid atoms and molecules are not organized in a definite lattice pattern. For example plastic, gel or glass.
Crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.
2) Amorphous solids do not have definite melting points.
Crystalline solids have definitive melting point.
what causes water to become too basic alkaline and why
Carbon Dioxide is the most common reason water becomes full of alkaline. Hopefully I could help :)
Which of the following statements about halogens is true? They are non metals that exist as single atoms, They are metals that exist as single atoms, They are non metals that exist as molecules of two atoms, They are metals that exist as molecules of two atoms
4 annnnnd 3
kio too no
Answer:
4 and 3
Explanation:
how Africa's bedrock can have glacier scratches
Means that the African continent was once in the higher latitudes, and in contact with Antarctica, where glaciers form due to the low temperatures in the poles. The continent drifted over time due to tectonic plate movement. Continental drift is powered by the convection current in the mantle of the earth.
Of the following elements, which one would have the smallest ionization energy ?
A. Nitrogen
B. Neon
C. Boron
D. Lithium
D. Lithium or Li has the smallest ionization energy of those listed with an energy of 5,3917.
I hope that helps u!
Lithium (Li) has the smallest ionization energy out of the given elements due to its single valence electron and relatively small nuclear charge, which makes it easier to remove an electron compared to Boron (B), Nitrogen (N), and especially Neon (Ne).
The element with the smallest ionization energy among Nitrogen (N), Neon (Ne), Boron (B), and Lithium (Li) is Lithium (Li). Ionization energy is the energy required to remove an electron from an atom in the gaseous state. Generally, ionization energy decreases as we move down a group in the periodic table because the outermost electron is farther from the nucleus and feels less nuclear attraction. Lithium, being in the first group and the second period of the periodic table, has only a single electron in its outer shell and a smaller nuclear charge compared to the other listed elements, making it easier to remove this electron. In comparison, Neon (Ne), as a noble gas, has a complete valence shell and a larger nuclear charge, resulting in a much higher ionization energy. Boron (B), while higher in ionization energy compared to Lithium, has lower ionization energy than Nitrogen due to having fewer electrons in its valence shell. Nitrogen (N) has a half-filled p subshell, which is relatively stable, raising its ionization energy higher than that of Boron.
When urea dissolves in water, the beaker becomes cold. Which statement describes this process? A) The ΔHsolvation is endothemic but the overall ΔHsolution is exothermic. B) The ΔHsolvation is exothermic and the overall ΔHsolution is exothermic. C) The ΔHsolvation is exothermic but the overall ΔHsolution is endothermic. D) The ΔHsolvation is endothermic and the overall ΔHsolution is endothemic.
The answer is; D
Solvation is the process by which the molecules of a solute interact with those of a solvent to form solvates. The interaction involves the formation of temporary bonds between the molecules of the elements. These bonds in this rection absorb energy from the atmosphere hence the reaction feels cold to the touch. This is called an endothermic reaction.
its c not d i just answered it
Which hybridization of orbitals is present in beryllium fluoride, BeF2?
Answer is: beryllium fluoride has sp hybridization.
Beryllium (Be) is metal from group 2 and fluorine (F) is nonmetal from group 17.
Electron configuration of beryllium atom: ₄Be: 1s² 2s².
Electron configuration of fluorine atom: ₉F 1s² 2s² 2p⁵.
In beryllium, one electron from 2s orbital gets excitted to the level of 2p orbital; s and p orbital are hybridized and form two sp-hybridised orbitals arranged in a linear shape.
Two fluorine atoms come closer to beryllium atom and sp hybridised orbitals of Be and p orbital of F get overlapped with each other and make bonds.
The hybridization of orbitals in beryllium fluoride (BeF2) is sp hybridization, resulting in a linear molecular geometry with a bond angle of 180 degrees due to the two sp hybrid orbitals formed from the 2s and 2p orbitals of beryllium.
Explanation:The hybridization of orbitals in beryllium fluoride, BeF2, is sp hybridization. Beryllium in its ground state has a 1s22s2 electron configuration, and to form bonds, one of the 2s electrons is promoted to the empty 2p orbital. After this, the 2s and one of the 2p orbitals hybridize to form two new orbitals that are identical in energy and shape, which are called sp hybrid orbitals. These hybrid orbitals in BeF2 ensure the molecule has a linear structure with a bond angle of 180 degrees.
A Lewis structure of BeF2 shows a beryllium atom with two single bonds to two fluorine atoms, each having three lone pairs of electrons. The linear geometry of BeF2 is maintained because of the two sp hybrid orbitals pointing in opposite directions away from the central beryllium atom to form bonds with the fluorine atoms.
Which of the following is not true of acids?
1. acids are corrosive
2. dillute acids feel slippery
3. acids have a distinctly sour taste
4. acids have more hydronium ions than hydroxide ions
Answer is: 2. dillute acids feel slipper.
1) Acids are corrosive is correct. For example hydrochloric acid (HCl) will react with most metals.
2) Dillute acids feel slippery is not correct. Bases, for example solution of sodium hydroxide feels slipery.
3) Acids have a distinctly sour taste is correct. For example, vinegar is mixture of acetic acid (CH₃COOH) and water (H₂O). Vinegar is colourless liquid with sour taste and pungent smell, freezing point of the vinegar is lower than glacial acetic acid.
4) Acids have more hydronium ions than hydroxide ions is correct. Because acid gives a lot of hydrogen cations (H⁺), pH (pH = -log[H⁺]) is lower than seven (acidic solution).
Answer: its (2) dillute acids feel slippery
Explanation:
its a base not acid
on a temperature versus time graph, how does the temperature at the beginning of a change is state compare with the temperature at the end of the change
Answer:
The temperature will remain the same.
Explanation:
When a material goes through a change of state, the temperature remains the same as witnessed on a temperature versus the time graph. Each change of state, that is, condensation, evaporation, melting, and fusion needs the withdrawal or supplementation of energy called latent heat. At the point of a change of state, there is no change in temperature. Though, in between the changes of states, the modifications in temperatures are brought about by the sensible heat.
Since electrons ___ each other, electrons pairs will be as _____ apart as possible
We have to answer based on basic concept on electron.
The correct answer is: Since electrons repel each other, electrons pairs will be as far apart as possible.
We know, electrons are negatively charged particles and negatively charged particles repel to each other.
When electrons which are of similar charge repel each other, they go far apart from each other..
In this reaction, what roll does the lead (II) nitrate play when 50.0 mL of 0.100M iron (III) chloride are mixed with 50.0 mL of 0.100M lead (II) nitrate?
Answer: The roll of lead (II) nitrate is that it is a limiting reactant of the reaction.
Solution : Given,
Molarity of [tex]FeCl_3[/tex] = 0.1 M
Volume of [tex]FeCl_3[/tex] = 50.0 ml = 0.05 L (1 L = 1000 ml)
Molarity of [tex]Pb(NO_3)_2[/tex] = 0.1 M
Volume of [tex]Pb(NO_3)_2[/tex] = 50.0 ml = 0.05 L
First we have to calculate the moles of [tex]FeCl_3[/tex] and [tex]Pb(NO_3)_2[/tex].
[tex]\text{ Moles of }FeCl_3=\text{ Molarity}\times \text{ Volume in L}[/tex]
[tex]\text{ Moles of }FeCl_3=(0.100M)\times (0.05L)=0.005moles[/tex]
[tex]\text{ Moles of }Pb(NO_3)_2=\text{ Molarity}\times \text{ Volume in L}[/tex]
[tex]\text{ Moles of }Pb(NO_3)_2=(0.100M)\times (0.05L)=0.005moles[/tex]
The balanced chemical reaction is,
[tex]2FeCl_3+3Pb(NO_3)_2\rightarrow 2Fe(NO_3)_3+3PbCl_2[/tex]
From the balanced chemical equation, we conclude that
3 moles of lead nitrate react with 2 moles of ferric chloride.
Thus 0.005 moles of lead nitrate react with [tex]=\frac{2}{3}\times 0.005=0.0033[/tex] moles of ferric chloride.
Moles of ferric chloride will be left unreacted = 0.005 - 0.0033 =0.0017 moles
Limiting reagent is the reagent in the reaction which limits the formation of product.
Excess reagent is the reagent in the reaction which is in excess and thus remains unreacted.
Therefore, in the given reaction, lead nitrate is the limiting reagent and ferric chloride is the excess reagent.
Answer: iron (III) chloride is the excess reactant in the reaction.
Explanation:
i just did the assignment
As air becomes more dense, _____. (Select all that apply)
O. air weighs less
O. gas molecules are closer together
O. air is colder
O. air weighs more
O. gas molecules are further apart
O. air is hotter
The answers that apply are;
gas molecules are closer togetherair weighs moreair is hotterWhen air is compressed, it means the same volume of space is occupied by more air molecules. This, therefore, means that the molecules are hitting each other with a higher frequency hence become hotter with more compression. It weighs more because there are more molecules in the same volume of space.
Answer:
air weighs more
air molecules are closer together
air is colder
Explanation: Trust me, I did the test and it was correct
Help! What did I do wrong??
Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are formed when 48.7 g of sodium are added to water? Show your work. (4 points)
2Na + 2H2O ---> 2NaOH + H2
2Na + 2H2O ---> 2NaOH + H2
48.7 g ? molecules
2 mol Na= 1 mol H2
1 mol Na= 23g Na
1 mol H2= 6.02x1023 molecules
(48.7g Na/1)x(1 mol Na/23g Na)x(1 mol H2/2mol Na)x(6.02x1023/1 mol H2)
(48.7)(6.02x1023)/(23)(2)= 293.174x1023 molecules
Can someone please tell me what I did wrong?
The molecules of hydrogen gas that are formed is when 48.7 g of sodium are added to water is 6.375 x 10²³ molecules
calculation
2 Na +2H₂O → 2 NaOH +H₂
Step 1: find the moles of sodium (Na)
moles =mass÷ molar mass
from periodic table the molar mass of Na = 23 g/mol
moles= 48.7 g÷ 23 g/mol =2.117 moles
Step 2:use the mole ratio to determine the moles of H₂
from given equation Na:H₂ is 2:1
therefore the moles of H₂ = 2.117 moles x 1/2=1.059 moles
Step 3: find the molecules of H₂ using the Avogadro's law
According to Avogadro's law 1 mole = 6.02 x 10²³ molecules
1.059 moles = ? molecules
by cross multiplication
= [(1.059 moles x 6.02 x10²³ molecules) / 1 mole] =6.375 x 10²³ molecules
A chemical reaction has just occurred in an insulated isolated system which caused an overall increase in the potential energy of the system. Which statement below is true?
Select one:
a. The temperature of the system decreased.
b. The temperature of the system increased.
c. Heat was taken in from the surroundings by the system.
d. Heat was given off to the surroundings by the system.
In an isolated system, the increase in potential energy caused by a chemical reaction is compensated by a decrease in temperature, as no energy or matter is exchanged with the surroundings.
Explanation:In an isolated system, no matter or energy is exchanged with the surroundings. Therefore, when a chemical reaction occurs in an isolated system causing an increase in potential energy, the energy does not come from an external source but rather a conversion from another form of energy within the system. This conversion means that heat (internal energy) was used to increase the potential energy. As a result, since the total energy in the system must remain constant (Law of Conservation of Energy), the temperature of the system would have to decrease to compensate for the energy used in increasing the potential energy (as per the definition of temperature as a measure of the average kinetic energy of the particles in a system). Therefore, statement A is true: the temperature of the system decreased.
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You are riding a bicycle home from school. You average 5 meters per second and you are headed south. What motion can you determine from this data? A Acceleration B Distance C Speed D Velocity
Answer : The correct option is, (D) Velocity
Explanation :
Velocity : It measures the speed of an object in a particular direction. It is a vector quantity. It depends on the magnitude and the direction. The S.I unit of velocity is, [tex]m/s[/tex]
Distance : It measures the length between the two objects. The S.I unit of distance is, meter.
Speed : It is defined as the distance traveled per unit of time. It does not have a direction. The S.I unit of speed is, [tex]m/s[/tex]
Acceleration : It is defined as the rate of change of velocity of an object with respect to time. The S.I unit of acceleration is, [tex]m/s^2[/tex]
Hence, the motion we can determine from the given data is, velocity.
You are riding a bicycle home from school. The average speed 5 m/s headed towards south.The motion that determine from this data is D. Velocity .
You can determine the velocity from the given data, as it includes both the speed (5 m/s) and the direction (south).
This makes velocity a vector quantity, distinguishing it from speed, which is scalar.In this context, you can determine the velocity from the given data. Velocity is a vector quantity, which means it includes both the magnitude (speed) and the direction. The problem states that you are riding at an average rate of 5 meters per second (m/s) and heading south. Thus, the velocity is 5 m/s south.It is important to distinguish between speed and velocity:
Speed is a scalar quantity that refers only to how fast something is moving.Velocity is a vector quantity that refers to how fast something is moving in a specific direction.
Correct question is: You are riding a bicycle home from school. The average speed 5 m/s headed towards south. What motion can you determine from this data?
A. Acceleration
B. Distance
C. Speed
D. Velocity
Steam is a form of _____.
A.humidity
B.liquid water
C.water vapor
D.precipitation
The answer to this question is A. Humidity.. because humitity causes steam
the answer is C. water vapor
Due to radioactive decay over many millions of years, it is possible for the element uranium to decay in
The uranium within these items is radioactive and should be treated with care. Uranium's most stable isotope, uranium-238, has a half-life of about 4,468,000,000 years. It decays into thorium-234 through alpha decay or decays through spontaneous fission.
Whats sodium stannite?and how can it be prepared?