Answer:
Ecosystem :
Any living organism interacting with its physical environment by any means is known as Ecosystem.
Ecology :
Ecology is the study of the ecosystem. In this field of biology, we study how an organism interact with its physical environment and how the environment respond.
Convert
375 m/s to ft/min
Answer:
73818.9
Explanation:
for an approximate result, multiply the speed value by 197
Describe the movement of particles in a solid substance as it is heated to its boiling point.
Answer:
in a solid particles or still but as it gets hot the particles will move around rapidly
As a solid heats to its boiling point, it undergoes phase changes from solid to liquid to gas. At each stage, the particles' movement changes from fixed vibrations to free movement. These changes occur at constant temperatures known as the substance's melting and boiling points.
Explanation:The movement of particles in a solid substance as it is heated to its boiling point involves different states of matter: the solid, liquid, and gas phases. In the solid phase, the particles of the substance are closely packed together and vibrate about fixed positions. As the temperature of the solid rises due to the heat, the vibrations of the particles increase. Upon reaching the melting point, the solid begins to transform into a liquid, a process known as melting.
The temperature remains constant during this phase transition until the entire solid has melted. In the liquid phase, the particles are not as closely packed as in a solid and can move more freely. As the temperature continues to rise, the liquid will eventually reach the boiling point, where it starts transforming into a gas in a process called vaporization. During this phase change, the temperature again remains constant until all the liquid has become a gas.
In the gas phase, the particles move most freely, colliding with each other and filling the available space. The behavior of these phase transitions is determined by the substance's unique melting and boiling points, which are affected by the environment's pressure. Phase changes also involve changes in the amount of heat in the substance, with heat absorbed during melting and vaporization, and released during condensation and freezing.
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what volume will 1.27 moles of helium gas occupy at stp
Answer:
28.45L
Explanation:
1mole of a gas occupy 22.4L at stp. This implies that 1mole of He also occupy 22.4L at stp.
Now if 1mole of He occupied 22.4L at stp, then, 1.27mol will occupy = 1.27x22.4 = 28.45L
Answer:
28.45L
Explanation:
1. Which sample contains a total of 9.0 * 10 ^ 23 atoms ? A) 0.50 mole of HCI B) 0.75 mole of H 2 O C) 1.5 moles of Cu D) 1.5 moles of H 2
c. 1.5 moles of Cu will contain a total of 9.0 * 10 ^ 23 atoms.
Explanation:
To convert moles into atoms, the molar amount and number of atom is multiplied by Avagadro's number.
Avagadro's number is 6.022×[tex]10^{23}[/tex]
So applying the formula in the given sample:
A) 0.5×6.022×[tex]10^{23}[/tex]
3.01×[tex]10^{23}[/tex] atoms.
B) 0.75 mole of H20
O.75×6.022×[tex]10^{23}[/tex]
= 4.5166×[tex]10^{23}[/tex] atoms.
C) 1.5 moles of Cu
1.5×6.022×[tex]10^{23}[/tex]
= 9.033×[tex]10^{23}[/tex]
D). 1.5 moles of H2
1.5 × 2 × 6.022 × [tex]10^{23}[/tex]
= 18.066 × [tex]10^{23}[/tex] atoms because H2 is 2 moles of hydrogen.
Atom is the smallest entity of matter having property of the element to which it is a part.
The sample that contains 9.0 x [tex]10^2^3[/tex] atoms would be 1.5 moles of Cu.
1 mole of a substance contains 6.0 x [tex]10^2^3[/tex] atoms of the same substance. Thus:
0.50 mole of HCl would contain: 0.5 x 6.0 x [tex]10^2^3[/tex] = 3.0 x [tex]10^2^3[/tex] atoms.0.75 mole of H2O would contain: 0.75 x 6.0 x [tex]10^2^3[/tex] = 4.5 x [tex]10^2^3[/tex] atoms.1.5 moles of Cu contain: 1.5 x 6.0 x [tex]10^2^3[/tex] = 9.0 x [tex]10^2^3[/tex] atoms1.5 moles of H2 contain: 1.5 x 2 x 6.0 x [tex]10^2^3[/tex] = 18.0 x [tex]10^2^3[/tex] atomsHence, the only sample that contains 9.0 x [tex]10^2^3[/tex] atoms is 1.5 mole of Cu.
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COMPLETE
How many grams of CaCl2 are in 250 mL of 2.0 M CaCl2?
Answer:
There are 55, 49 g of CaCl2
Explanation:
We calculate the weight of 1 mol of CaCl2:
Weight CaCl2=Weight Ca + 2x(Weight Cl)= 40,08g+ 2x 35, 45g=110,98 g/mol
1000ml-----2 mol of CaCl2
250ml------x= (250 ml x 2 mol of CaCl2)/1000ml= 0,5 mol of CaCl2
1mol -----110,98g
0,5mol ---x= (0,5molx110,98g)/1 mol= 55,49 g
What is the pressure in millimeters of mercury of 0.0105 mol m o l of helium gas with a volume of 223 mL m L at 50. ∘C ∘ C ? (Hint: You must convert each quantity into the correct units (L L , atm a t m , mol m o l , and K K ) before substituting into the ideal gas law.)
The pressure of helium gas in the given condition is 948.45 mm of Hg.
Explanation:
As per ideal gas law, the product of pressure and volume will be equal to the product of number of moles, gas constant and temperature of gas molecules. This is formed by the combination of three basic laws of kinetic theory of gases.
[tex]PV = nRT[/tex]
As the pressure P is unknown, but the volume V, temperature T and number of moles n is given for helium gas.
R = 8.314 J mol⁻¹ K⁻¹ = 62.363 mmHg L mol⁻¹ K⁻¹.
Then, pressure can be found as
[tex]P = \frac{nRT}{V}[/tex]
As T = 50°C = 50 + 273 K = 323 K and volume V = 223 mL = 0.223 L and n = 0.0105 mol
Then, [tex]P = \frac{0.0105*62.363*323}{0.223}=948.45 mm of Hg[/tex]
So, the pressure of helium gas in the given condition is 948.45 mm of Hg.
Any collection of things that have some influence on one another can be thought of as a system. When we talk about a system, we are also talking about all the parts that should be included, how those parts interact with one another, and to how the system as a whole relates to other systems. Consider the water cycle on Earth. Scientists have hypothesized about how climate change, specifically global warming, could impact the water cycle and therefore life on Earth. Scientists might consider specific research questions regarding this topic. They would include which questions listed above? A) I and II B) I, II, IV C) I and III D) I, II, III, IV
The questions listed above relate to Earth systems and their interactions, especially in relation to climate change and global warming.
The questions listed above relate to the study of Earth systems and their interactions:
The parts that should be included.How those parts interact with one another.How the system as a whole relates to other systems.Scientists researching climate change and global warming focus on these aspects to understand the impact on the water cycle and life on Earth.
Scientists consider various research questions about how global warming affects the water cycle, investigating the effects on evaporation, precipitation, ocean currents, and ecosystems.
When considering how global warming may impact the water cycle, and thus life on Earth, scientists are likely to focus on a wide range of research questions. These could include questions such as:
How does an increase in atmospheric temperatures affect evaporation rates?What impact does climate change have on precipitation patterns and the frequency of extreme weather events?How do changes in the water cycle affect ocean salinity and currents?What are the implications of altered water cycles for terrestrial and aquatic ecosystems? These questions all relate to the complex interactions within the Earth's climate system, including the roles of feedback mechanisms in either amplifying or dampening the effects of climate variables on one another. Understanding these interactions and the feedback loops, both positive and negative, is essential to predict and mitigate the impacts of climate change on Earth's systems.
Nitrogen molecules rest with oxygen molecules. Nitrogen monoxide molecules are made.
N2 + O2 → 2NO
Nitrogen molecules and oxygen molecules react extremely slowly, even at 200°C.
The reaction between nitrogen
and oxygen becomes faster as both the temperature and the pressure increase. Explain why, using the reacting
particle model. (6 marks)
Answer:
At high temperature and pressure, reactions become faster
Explanation:
Collision theory or reaction particle model state that reacting particles must collide before reactions occur.
Reaction rate of reaction is dependent on the frequency of collision.
Kinetics of gases increases at higher temperature and pressure.
As the temperature and pressure of nitrogen and oxygen increased, they bound to move more faster, collide more frequently as to attain activation energy easily thereby increasing the reaction rate or making the reaction to complete faster.
Also at higher pressure, gaseous reactants are closer to each other.
What is required in order to determine whether or not an object moves?
a reference point
distance
Odisplacement
standard units
Mark this and return
Save and Exit
Save and Exit
Next
Next
Subenit
The correct answer is a reference point.
To determine whether or not an object moves, one must have a reference point. A reference point is a fixed point that is used to determine if an object has changed its position. Without a reference point, it is impossible to ascertain whether an object is moving or at rest because motion is relative. An object may appear to be moving when observed from one reference point, but it could be stationary when observed from a different reference point.
Distance alone does not indicate motion; it only specifies the amount of space between two points. Displacement is the change in position of an object, which requires a reference point to be measured. Standard units are necessary for quantifying distance or displacement but do not themselves indicate motion.
In summary, while distance, displacement, and standard units are important for describing the motion of an object, a reference point is the fundamental requirement to determine whether an object is moving.
What caused wind to blow
Answer:
Different atmospheric pressure. When there is a different atmospheric pressure, air moves from the higher pressure to the lower pressure area which results in what you call WIND but can result in various speeds and pressure.
Hope this helped and if it did, please give my answer a brainliest.
Answer:
Wind is caused by differences in the atmospheric pressure.
Explanation:
When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds of various speeds.
Column A
Column B
1.
a. pH paper
b. Litmus paper
3.
only tells
you acid
or base
can tell
you the
pH
number
turns red
or blue
only
can turn
a variety
of colors
that
represent
different
pH
numbers
Answer:
a. pH paper can tell you the pH. pH paper only can turn a variety of colors that represent different pH numbers.
B. Litmus paper only tells you acid or base in order to turns red or blue color.
Explanation:
pH paper is a type of paper which is used for the identification of pH of the substance. On pH paper, colors are present which shows pH numbers of a solution while litmus paper is a type of paper which is used for the identification of solution whether it is acidic or basic. There are two colors i. e. Red and Blue. If the litmus paper turns red, the solution is acidic or if the litmus paper turns blue, the solution is alkaline or basic.
74 calories to kilocalories
Answer:74 calories to kilocalories =0.074
Hope this helps
What happens to the volume of a gas in a closed container if the temperature increases, but the pressure remains the same? Why?
Answer:
Volume will goes to increase.
Explanation:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
So when the temperature goes to increase the volume of gas also increase. Higher temperature increase the kinetic energy and molecules move randomly every where in given space so volume increase.
Now we will put the suppose values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 4.5 L × 348 K / 298 k
V₂ = 1566 L.K / 298 K
V₂ = 5.3 L
Hence prove that volume increase by increasing the temperature.
If I have 2.9 L of gas at a pressure of 5.0 atm and a temperature of 50.0 °C, what will be the
temperature of the gas if I decrease the volume of the gas to 2.4 L and decrease the
pressure to 3.0 atm?
Answer:
160.4K
Explanation:
Given parameters:
Initial volume of gas = 2.9L
Initial pressure of gas = 5atm
Initial temperature = 50°C
Final volume = 2.4L
Final pressure of gas= 3atm
Unknown:
Final temperature = ?
Solution:
To solve this problem, we have to apply the combined gas laws.
Mathematically, the law is expressed as;
[tex]\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }[/tex]
where P₁ is the initial pressure
V₁ is the initial volume
T₁ is the initial temperature
P₂ is the final pressure
V₂ is the final volume
T₂ is the final temperature
Since T₂ is the unknown, we must solve for it.
convert T₁ from °C to K;
T₁ = 273 + 50 = 323K
Now insert the parameters;
[tex]\frac{5 x 2.9}{323} = \frac{3 x 2.4}{T_{2} }[/tex]
[tex]T_{2}[/tex] = 160.4K
According to Boyle's Law, when the volume of a gas decreases at constant temperature, the pressure of the gas increases. Using the formula P1V1 = P2V2, we can calculate the final temperature of the gas. In this case, the final temperature would be approximately 29.0 °C.
Explanation:According to Boyle's Law, when the volume of a gas decreases at constant temperature, the pressure of the gas increases. This is expressed mathematically as P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.
In this case, the initial pressure is 5.0 atm, the initial volume is 2.9 L, the final volume is 2.4 L, and the final pressure is 3.0 atm. Plugging these values into the equation, we can solve for the final temperature. Rearranging the equation to solve for temperature gives T2 = (P2V2/T1) * (V1/P1).
Using the given values, we find T2 = (3.0 atm * 2.4 L) / (5.0 atm * 2.9 L) * (50.0 °C). Solving this equation gives T2 ≈ 29.0 °C.
How many iron ions are found in 10.9 molecules
Answer:
= 6.56 × 10²⁴ ions
Explanation:
We are given;
10.9 moles of Iron (iron doesn't exists as a molecules, so we can't have 10.9 molecules but we can have 10.9 moles)
We are required to determine the number of ions
We need to know that;
1 mole of iron = 6.022 × 10²³ ions
Therefore;
10.9 moles of iron will contain;
= 10.9 moles × 6.022 × 10²³ ions/mol
= 6.56 × 10²⁴ ions
Hence, 10.9 moles of iron contains 6.56 × 10²⁴ ions
What kinds of elements form an ionic bond?
We have that For the Question"What kinds of elements form an ionic bond"
We see from the Definition that this kind of bond is formed b/w metals and non-metals
From the question we are told
What kinds of elements form an ionic bond
Generally
The Other Name for Ionic bond is covalent bond and it is formed when two ions of variant charge converge and this kind of bond is formed b/w metals and none metals
Therefore
For the Question
What kinds of elements form an ionic bond
We see from the Definition that this kind of bond is formed b/w metals and non-metals
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Calculate the approximate number of molecules in a drop of water with a mass of 0.10 g.
A.
3 × 1021 molecules
B.
2 × 1023 molecules
C.
6 × 1021 molecules
D.
4 × 1023 molecules
Answer:
your answer is D -_- bc they want the approximate
Answer:
Option A. 3 × 10^21 molecules
Explanation:
From Avogadro's hypothesis, 1mole of any substance contains 6.02x10^23 molecules. This means that 1mole of H20 also contains 6.02x10^23 molecules.
1mole of H2O = (2x1) + 16 = 2 + 16 = 18g
If 1mole(i.e 18g) of H2O contains 6.02x10^23 molecules,
Therefore 0.1g of H2O will contain = (0.1 x 6.02x10^23) /18 = 3 x 10^21 molecules
Write the formula for the following covalent compounds
1.) Carbon Dioxide.
2.) Sulfur Trioxide.
3.) Dinitrogen trioxide.
4.) Dinitrogen pentoxide.
5.) Phosphorus trichloride.
6.) Ammonia.
7.) Sulfur Hexachloride.
8.) Phosphorus Pentoxide.
9.) Carbon Tetrachloride.
10.) Silicon Dioxide.
11.) Carbon Disulfide.
12.) Phosphorus tribromide.
13.) I don't have notes on this one so I don't know.
14.) Aluminum Oxide.
15.) Dichloride Heptoxide. (Not 100% sure if that was a 2 or a 7 at the end.)
Hope this helps and sorry it took so long I had to search through my chemistry notes from awhile ago. But I tried as best I could. :)
Covalent compounds' formulas are represented with symbols for each element involved and subscript numbers indicating the quantity of each element. Lewis structures can be used to visualize the bonds formed by shared electrons. Hydrate ionic compounds have additional notation for water molecules in their formulas.
Explanation:The formula for covalent compounds is written using the symbols for each element involved, followed by subscript numbers to indicate the quantity of each element in the compound. For example, the compound composed of sulfur (S) and fluorine (F) is represented as SF₆, which shows that one sulfur atom is bonded with six fluorine atoms to form a molecule of this compound. Another example is N₂O₃, representing that two nitrogen (N) atoms and three oxygen (O) atoms are bonded together. Similarly, Cl₂O₇ indicates that two chlorine atoms bond with seven oxygen atoms to form this compound.
By using the Lewis structure, we can visualize how the atoms share electrons in order to form covalent bonds. When these molecules are formed, each atom shares its electrons with the others to create a stable connection, or bond, between them. The quantity of shared electrons is determined by the valence of each atom.
In terms of hydrate ionic compounds, the formula is written by adding a dot and the number of water molecules to the formula. For instance, if a compound includes water molecules, it will include a term such as '·2H₂O' included in the formula.
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Question 4 (1 point)
In an endothermic reaction products are
than reactants
in potential energy and ___stable
higher more
In an endothermic reaction products are HIGHER than reactants in potential energy and LESS stable.
Explanation:
Energy is input into the reaction in an endothermic reaction. This means the products are of a higher energy level than the reactants. Therefore the reaction increases Gibb's free energy and reduces entropy. Remember in thermodynamic stability involves an increase in entropy and a decrease in Gibbs free energy. Therefore the products are less stable than the reactants. This is why endothermic reactions do not occur spontaneously like exothermic reactions.
How do genes and chromosomes relate
Chemical reactions occur at the same rate no matter what the size of the reactant particles.
True or false?
Answer:
false
Explanation:
it can be differ when the concentration,surface area and when the rate of reaction is changed
Final answer:
The statement is false. Reaction rates are affected by the size of the reactant particles because smaller particles have a greater surface area, which increases the number of collisions and the rate of reaction.
Explanation:
The statement that chemical reactions occur at the same rate no matter what the size of the reactant particles is false.
The rate of a chemical reaction is influenced by various factors. One of these factors is the state of subdivision of the reactants, which pertains to the size of the reactant particles. A reaction between two reactants, for example, will often occur at a faster rate if one reactant is in the form of many small particles rather than one large lump. This is because many small particles have a greater surface area, leading to more collisions, which increases the reaction rate.
Other factors affecting the rate include the chemical nature of the reacting substances, temperature, concentration of the reactants, and the presence of a catalyst. Each of these can have a significant impact on how quickly a reaction proceeds.
Select the correct answer.
The presence of which phenomenon proved the predictability of the big bang theory?
O A.
death of large, ancient stars
B.
cosmic microwave background (CMB)
O c. formation of the Orion nebula
D. formation of new stars
Racet
N
.
Answer: your answers are between d or b
Explanation:
The Cosmic Microwave Background (CMB), a remnant heat from the Big Bang, supports the theory's predictability. Its discovery provided strong evidence for the beginning of the universe as theorized in the Big Bang Theory.
Explanation:The predictability of the Big Bang Theory was proven by the presence of the Cosmic Microwave Background (CMB). The CMB refers to the thermal radiation that is presumed to be leftover from the 'Big Bang' – the explosion that marked the beginning of the universe approximately 13.8 billion years ago. This residual heat was predicted by the Big Bang Theory, and its eventual discovery provided strong evidence supporting the theory. Thus, it is the CMB that validated the predictability of the Big Bang Theory more than the other phenomena listed in your options.
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Why might you only see a rainbow when rain is in front of you
Answer:
rain acts like a light prism which displays rainbow colors when light is shown through
Answer:
We see rainbow when the sun is behind us and and falling rain is in front of us
Explanation:
when sunlight strikes a falling drop of water it is retracted , changed indirection, by the surface of the water
5. What happens to the mass when you change
the volume?
It decreases
Explanation:If the mass of the object stays the same but the volume of the object decreases then its density becomes greater. If the volume of the object stays the same but the mass of the object increases then its density becomes greater.
What substances devolve in water
Answer:
Two types of substances will dissolve in water: ionic compounds, such as sodium chloride (NaCl, or table salt) and compounds composed of larger molecules that have a net charge due to the arrangement of their atoms. Ammonia (NH3) is an example of the second type.
Explanation:
Answer:
sugar
salt
Explanation:
Which of the following is an example of an organism that reproduces through mitosis?
A. human
B. tarantula
C. sunflower
D. bacterium
How many moles of ammonium sulfate can be from the reaction of 30.0 mol of NH3 with H2SO4 according to the following equation: 2NH3+H2SO4=(NH4)2 SO4
Answer:
15 moles of ammonium sulfate would be formed from 30 moles of ammonia.
Explanation:
Given data:
Number of moles of ammonium sulfate formed = ?
Number of moles of ammonia = 30.0 mol
Solution:
Chemical equation:
2NH₃ + H₂SO₄ → (NH₄)₂SO₄
Now we will compare the moles of ammonium sulfate with ammonia.
NH₃ : (NH₄)₂SO₄
2 : 1
30.0 : 1/2×30.0 = 15.0 mol
So 15 moles of ammonium sulfate would be formed from 30 moles of ammonia.
Steve works at a gas station in an urban area. He is constantly exposed to particulate material emitted from vehicles. For this reason, Steve is likely to suffer from which of these? A. asthma B. obesity C. diabetes D. hearing defect
Answer:
asthma
Explanation:
asthma is a respiratory problem which causes difficulty in breathing which is usually because of allergic reactions or hypersensitivity to something else. so as it's written in the question that materials are emitted from vehicles, there is a big chance that they will cause an allergic reactions (asthma) in Steve.
What is the molarity of 6 moles (mol) of NaCl dissolved in 2 L of water?
Answer: M = 3 M
Explanation: Molarity is the ratio between the number of moles per unit Liter of volume.
M = n / L
= 6 mole / 2 L
= 3 M
You just competed in a track meet and you run the 1500m race in 403 s. what was your average speed in miles per hour
Answer:
8.46mph
Explanation:
Given parameters:
Distance run = 1500m
Time taken to cover distance = 403s
Unknown:
Average speed in mph = ?
Solution:
The average speed of a travel is the rate of change of the total distance with time.
Speed is a scalar quantity that specifies magnitude of the travel but no direction.
Average speed = [tex]\frac{Total distance covered }{Time taken}[/tex]
we need to covered distance to miles from m and time in seconds to hours.
1609m = 1 mile
1500m = [tex]\frac{1500}{1609}[/tex] = 0.93miles
3600s = 1hr
403s = [tex]\frac{403}{3600}[/tex] = 0.11hr
Average speed = [tex]\frac{0.93}{0.11}[/tex] = 8.46miles per hour