Answer:
John Dalton, an English chemist and meteorologist, is credited with the first modern atomic theory based on his experiments with atmospheric gases.
If a 2kg bird is pushed by the wind with a force of 2N, how fast does the
bird accelerate?
O 1m
O 2 m/s2
O 4m/s2
O 1 m/s2
The bird will accelerate with an acceleration of 1 m/s². Therefore, option (4) is correct.
What is acceleration?Acceleration of a body can be explained as the change of velocity of a body with respect to time. The acceleration of a body is a vector parameter with both magnitude and direction. Acceleration can be defined as the 2nd derivative of position with respect to time.
According to Newton's 2nd law of motion, force is the product of the mass and acceleration of an object.
F = ma
And, a = F/m
Therefore, the acceleration and mass of a body have an inverse relationship.
Given, the force acting on the bird, F = 2 N
Given the mass of the bird, m = 2Kg
The acceleration in the speed of the bird can be calculated as:
a = F/m
a = 2N/2 Kg
a = 1 m/s²
Therefore, the bird accelerates at 1 m/s² because of the wind.
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HELP AGAIN!!!
Which item in Figure 1 expanded the most when heated?
aluminum
steel
glass
oak
The diagram below shows a box with
two forces acting upon it.
20 N
20 N
Based on the diagram, which of the
following is most likely true?
A The box will move downward.
B The box will move toward the left.
C The box will move toward the
right.
D The box will not move or change
direction.
please answer this question for me I will answer your questions too I promise!!
Answer:
C
Explanation:
The airplanes speed would decrease
How does the average reaction rate differ from an instantaneous reaction rate?
a) The average reaction rate is how quickly the reaction proceeds at a specific time. An instantaneous reaction rate is how quickly the reaction proceeds over time.
b) The average reaction rate is how quickly the reaction proceeds over time considering the reactants. An instantaneous reaction rate is how quickly the reaction proceeds at a specific time considering the products.
c) The average reaction rate is how quickly the reaction proceeds over time. An instantaneous reaction rate is how quickly the reaction proceeds at a specific time.
d) The average reaction rate is how quickly the reaction proceeds over time. An instantaneous reaction rate is how quickly the reaction proceeds compared to another reaction.
Answer:1. The instantaneous rate is the rate of a reaction at any particular point in time, a period of time that is so short that the concentrations of reactants and products change by a negligible amount. The initial rate is the instantaneous rate of reaction as it starts (as product just begins to form).
Explanation:
average rate
rate of a chemical reaction computed as the ratio of a measured change in amount or concentration of substance to the time interval over which the change occurred
initial rate
instantaneous rate of a chemical reaction at t = 0 s (immediately after the reaction has begun)
instantaneous rate
rate of a chemical reaction at any instant in time, determined by the slope of the line tangential to a graph of concentration as a function of time
rate of reaction
measure of the speed at which a chemical reaction takes place
rate expression
mathematical representation relating reaction rate to changes in amount, concentration, or pressure of reactant or product species per unit time
Solutions
Answers to Chemistry End of Chapter Exercises
1. The instantaneous rate is the rate of a reaction at any particular point in time, a period of time that is so short that the concentrations of reactants and products change by a negligible amount. The initial rate is the instantaneous rate of reaction as it starts (as product just begins to form). Average rate is the average of the instantaneous rates over a time period.
3.
rate
=
+
1
2
Δ
[
CIF
3
]
Δ
t
=
−
Δ
[
Cl
2
]
Δ
t
=
−
1
3
Δ
[
F
2
]
Δ
t
5. (a) average rate, 0 − 10 s = 0.0375 mol L−1 s−1; average rate, 12 − 18 s = 0.0225 mol L−1 s−1; (b) instantaneous rate, 15 s = 0.0500 mol L−1 s−1; (c) average rate for B formation = 0.0188 mol L−1 s−1; instantaneous rate for B formation = 0.0250 mol L−1 s−1
Previous: Introduction
Next: 12.2 Factors Affecting Reaction Rates
Answer:
a avarge rat is a select period of time win itstantanous is at that time
Explanation:
Which three phenomena occur during a double-slit experiment and support the wave model of light?
A. The light passes through the slit
B. Bright areas appear on the screen
C. Light bends around the edges of the slit
D. Dark areas appear on the screen
Answer:BC And D
Explanation:just did the quiz
The three phenomena occur during a double-slit experiment and support the wave model of light is bright areas appear on the screen, light bends around the edges of the slit, dark areas appear on the screen. Therefore, option B, C and D are correct.
What is double slit experiment ?The double-slit experiment, which was conducted to study the characteristics of light in the eighteenth century, has subsequently been found to illustrate the duality of photons as well as the ideas of superposition and quantum interference.
It implies that things we refer to as "particles," like electrons, in some ways mix the traits of both particles and waves. That is quantum physics' renowned wave-particle duality.
The three phenomena occur during a double-slit experiment and support the wave model of light is bright areas appear on the screen, light bends around the edges of the slit, dark areas appear on the screen.
Thus, option B, C and D are correct.
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Na+H2O=NaOH+H2
Balancing
Answer:
Hey mate, here is your answer. Hope it helps you.
Explanation:
The balanced equation is 2Na+2H2O———-> 2NaOH +H2.
first to answer first gets 10 pts and brainlesit!
Answer:
According to your answers last quarter for number 1
Number 2 waxing gibbous
Explanation:
how many gram of sulphutic acid is present in 0.25 moles of sulphuric acid
Answer:
Mass = 24.52 g
Explanation:
Given data:
Mass of sulfuric acid = ?
Number of moles of sulfuric acid = 0.25 mol
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of sulfuric acid is 98.07 g/mol
Now we will put the values in given formula.
0.25 mol = mass/ 98.07 g/mol
Mass = 24.52 g
Please help me the picture is above, I’ll mark as brainliest.
What is the differance between iron ii and iron iii?
Answer:
iron ii is reddish in color and is known as the mineral hematite. iron iii is black and is the mineral wustite.
Explanation:
What is the measure of how likely an atom is to react with another element
Aqueous copper(II) nitrate reacts with aqueous sodium sulfide to produce aqueous sodium nitrate and copper(II) sulfide as a precipitate. In this reaction 469 grams of copper(II) nitrate were combined with 156 grams of sodium sulfide to produce 272 grams of sodium nitrate.
Yield of reaction = 80%
Further explanationReaction
Cu(NO₃)₂ (aq) + Na₂S (aq) ⇒ 2 NaNO₃ (aq) + CuS (s)
mol Cu(NO₃)₂ :(MW 187,56 g/mol)
[tex]\tt \dfrac{469}{187.56}=2.5[/tex]
mol Na₂S :(MW 78,0452 g/mol)
[tex]\tt \dfrac{156}{78.0452}=2[/tex]
Limiting reactant⇒Na₂S( 2 < 2.5)
mol of NaNO₃ (MW = 84,9947 g/mol)
[tex]\tt 2\times 2=4[/tex]
mass NaNO₃ (theoretical)
[tex]\tt 4\times 84.9947=339.979~g[/tex]
yield[tex]\tt \dfrac{272}{339.979}=0.8\rightarrow=80\%[/tex]
Differentiate between acids and bases on the basis of their pH values. Give an example of each type.
Bases are the chemical opposite of acids. Acids are defined as compounds that donate a hydrogen ion (H+) to another compound.
Definition of Acids - An acid is any chemical compound which when dissolved in water gives a solution with a hydrogen ion activity greater than in pure water. Bronstead Lowry
Definition of Base - A base is an aqueous substance that can accept hydrogen ions. Bronstead Lowry Definition: A base is any substance which accepts a proton.
Physical Characteristics of Acids - Depending on the temperature, acids can occur in solid, liquid or gaseous form. Taste sour.
Physical Characteristics of Base - Bases feel slippery because of the reaction of the base with the oils of your hand. Frequently solids except ammonia which is a gas. Taste bitter.
Properties of Acids - Electrolytes, conduct electricity (because electrolytes), react with many metals.
Properties of Base - Electrolytes, conduct electricity, ranges from insoluble to so soluble that they can react with water vapor.
Acids are often used to remove rust from metals, as an electrolyte in batteries, for mineral processing, to produce fertilizers and gasoline and as additives in food and beverages. Bases are used primarily in cleaning as dishwashing and laundry detergents, oven cleaners and stain removers.
Here are some differences! Hope this helps, sorry I couldn't think of anything else. ;(
Make a claim about why scientists might have two ways for thinking about Earth's layers. Summarize evidence to support the claim and explain your reasoning.
Answer:
Direct evidence from rock samples and indirect evidence from seismic waves may account for why scientists have two ways of thinking about earth's layers
Explanation:
Scientists who study about the earth's structure and components called geologists have two main types of evidence to learn about Earth's interior namely
1. direct evidence from rock samples
2. indirect evidence from seismic waves
Direct evidence From Rock Samples
Scientists examine rocks from inside the Earth and these rocks give them clues about Earth’s structure. Some scientists have drilled holes as much as 12 kilometers into Earth and bring up samples of rock. From these samples, they can make inferences about conditions deep inside Earth, where these rocks formed. In addition, forces inside Earth sometimes blast rock to the surface from depths of more than 100 kilometers. These rocks from deep within the Earth provide more information about the interior.
Indirect evidence From Seismic Waves
Since scientist cannot look inside Earth, they have devised an indirect methods of observation by using seismic waves. When earthquakes occur, they produce seismic waves. Scientists record the seismic waves and study how they travel through Earth. The speed of seismic waves and the paths they take reveal the structure of the planet. Using data from seismic waves, scientists have learned that Earth’s interior is made up of several layers with each layer surrounding the layers beneath it.
Name three ways in which unicellular organisms can move. Describe one of them.
Answer:
Unicellular organisms achieve locomotion using cilia and flagella. By creating currents in the surrounding environment, cilia and flagella can move the cell in one direction or another.
Explanation:
Unicellular organisms are the smallest and simplest of all living beings, they are composed of a single cell, and they do not form any type of tissue.
They move through appendages of the membrane that allow movement which are:
Flagella, these are long and thin appendages that serve as locomotion organelles and are responsible for the majority of mobile bacteria being able to move in liquid media. Cilia are mobile extensions of the plasma membrane that cover the surface of its membrane and have the function of facilitating metabolism by producing movements and currents in the liquid of the cellular environment.Pseudopods are extensions of the protoplasm area used in a similar way to cilia and flagella.Amoebas, unicellular protists, are characterized by their irregular shape and their movements based on pseudopods, that is, tentacular extensions of their cytoplasm that allow them to engulf (engulf) food and incorporate them through their cell membrane.
Therefore, we can conclude that the 3 ways unicellular organisms can move are through fragelli, cilia, and pseudopods.
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please help
1. State the relationship between atomic radius and metallic reactivity down group 2. Explain in terms of atomic structure why this relationship occurs. as atomic radius down group 2
Answer:
Atomic radius is directly proportional to Metallic reactivity in group 2.
Explanation:
Atomic radius is directly proportional to Metallic reactivity in group 2.
As we move down the group in group 2 which is called as the alkaline earth metals, the atomic number increases due to which the subshell increases. And the outermost shell's electron are less tightly held to the nucleus of the atom. Since the electrons are loosely held that means they can easily participate in reactions and that what makes it reactive down the 2nd group. Therefore alkaline earth metals with higher atomic number are more chemically reactive.
where would earth's be positioned during autumn if you lived in the southern hemisphere
Answer:
Autumn is one of the four basic seasons of the year in the temperate climate zone. It is characterized by moderate air temperatures with a decreasing daily average, and relatively high annual precipitation. The climate autumn is the period of the year in which the average daily air temperature ranges around 10° C.
Astronomical fall begins at the fall equinox and lasts until the winter solstice, which roughly means in the southern hemisphere between March 23 and June 22 (sometimes these dates are a day earlier or a day later, and in a leap year they may be additionally retracted one day). During astronomical autumn, the day time of the day is shorter than the night time, and moreover, with each successive day of the day it decreases and night increases.
PLEASE HELP!!!!!!!
1. _____ - the phase change in which a substance changes from a liquid into a gas.
Vaporization
Heat of vaporization
Condensation
Evaporation
2. _____ - the process that changes a substance from a liquid to a gas at temperatures below the substances boiling point.
Vaporization
Condensation
Evaporation
Heat of vaporization
3. _____ - the energy a substance must absorb in order to change from a liquid to a gas.
Vaporization
Condensation
Heat of vaporization
Evaporation
4. The arrangement of molecules in water becomes less orderly as water melts and _____ orderly as water freezes.
more
less
Other:
Answer:
1. Vaporization
2. Evaporation
3. Heat of vaporization
4. more
Explanation:
This problem deals with a phase change from liquid to gas. In such a change heat is added to cause the vaporization of the liquid to form gases.
Vaporization is a phase change from liquid to gas. It is achieved by boiling a liquid to the boiling point. Evaporation is one of such form of vaporization attained when a liquid does not reach boiling point. The heat of vaporization is the amount of heat supplied to change a liquid to gas. Molecules of water becomes orderly as it freezes.Answer:
Hey again sissy how you doing?
Explanation:
atom 1 has mass=12 protons=6
atom 2 has mass=14 electrons=6
are these atoms isotopes of each other or different elements
Answer:
Atom isotopes
Explanation:
The number of protons is equal to the number of electrons in elements therefore atom 2 has 6 protons like atom 1. This means that both are the same atom but with different masses which means they are isotopes.
The atoms are isotopes.
Isotopes are atoms having the same atomic number (i.e proton) but different mass number due to the difference in the neutron number of the atoms involved.
For atom 1:Mass number = 12
Proton = 6
For atom 2:Mass number = 14
Proton = Electron = 6 (for neutrao atom)
From the above, we can see that atom 1 and atom 2 have the same number of protons but different mass number.
Therefore, we can conclude that the atoms are isotopes
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Which of the following remains would be most likely only be found as a compression fossil?
a shell
a dinosaur
a mammoth
a leaf
Answer:
A Leaf
Explanation:
Compressions are the way that leaves are fossilized as the leaves are pressed firmly between hard layers of rock.
Answer:
Leaf
Explanation:
Because it is a plant
Energy can be changed from potential to kinetic.
A.True
B.False
Answer:
An object has potential energy (stored energy) when it is not in motion. Once a force has been applied or it begins to move the potential energy changes to kinetic energy (energy of motion).
Therefore, true. (Also would u mind giving brainliest, you don't have to hehe)
Which metalloid is often found in microchips, semiconductors, and sand?a. boron b. arsenic c. germanium d. silicon
Answer:
silicon
Explanation:
Silicon. Silicon is often found in electronic devices, as well as the sand.
hope this helps UwU
10 Lisa lives one block east and one block south of the elementary school. What is the reference point given in this position description? * (7 Points) Lisa's house one block east one block south the elementary school
Answer: the elementary school
Explanation:
which compound is ionic?
1. CaBr2
2. NO2
3. CH4
4. NBr3
options are:
1. Kelvin
2. Grams
3. Degrees Celcius
4. Degrees Fahrenheit
Answer:
1. Kelvin
Explanation:
The standard temperature for scientific report is the kelvin.
According to the SI unit definition, temperatures should reported in Kelvin.
On the kelvin scale, the freezing point of water is 273kThe melting point of water is 373k The kelvin is widely accepted in scientific climes. It is possible to convert from this scale to another.Which has more mass, 2 moles neon or 2 moles nitrogen?
Answer:
two moles noen
so yeah that's my answerA student was assigned to take water samples from a lake near his home. He measured the pH of one of the water samples to be 6.0. Which of the following best describes this sample of water?
Highly acidic
Slightly acidic
Highly basic
Slightly basic
Answer: I'm not sure but I'm making a guess cause that's what I put in mines
Explanation: I think just THINK it's "B.- Slightly Acidic"
how are water and salt regulated at the organ level
Salt and water level is balanced in our body by the proper regulation through hormonal actions. The level of sodium is controlled and the water if needed is reabsorbed from urine. And if the salt concentration is higher it is removed through urine.
What water- salt balance ?In addition to actively holding or releasing water in urine, the body manages its salt and water balance by excreting extra sodium in urine. This method has the benefit of reducing the need on external water sources for the long-term preservation of bodily fluids.
Researchers discovered that the kidney regulates levels of sodium, potassium, and the waste product urea to save or release water. This may be the link between salt consumption and glucocorticoid levels.
A high-salt meal raised glucocorticoid levels, which increased the amount of energy utilized by the liver and muscle to generate urea, which the kidney then used to conserve water.
The maintenance of the body fluids' normal concentration, or the sum of all dissolved chemicals that would exert osmotic pressure against a barrier impervious to them, is known as osmotic control.
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How many moles are in 5.67x10^24 atoms of RbCl?
Answer:
9.42 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.67 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 9.418604...[/tex]
We have the final answer as
9.42 molesHope this helps you
