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
What type of chemical reaction occurs when more energy Is released during the chemical reaction than is needed to start the chemical reaction
Answer:
Explanation:
Exothermic Reactions
Exothermic Reactions
This means that the energy required to break the bonds in the reactants is less than the energy released when new bonds form in the products. Excess energy from the reaction is released as heat and light. Figure: Chemical reaction: A Hermite reaction, which produces molten iron.
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:
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.
so according to bronsted and lowry, the acid is any species that can donate a proton.
How can a proton switch to another atom?
Is that even possible?
Answer:
A Brønsted-Lowry acid is any species that can donate a proton (H+) to another molecule. A Brønsted-Lowry base is any species that can accept a proton from another molecule. In short, a Brønsted-Lowry acid is a proton donor (PD), while a Brønsted-Lowry base is a proton acceptor (PA).
Explanation:
first to answer first gets 10 pts and brainlesit!
Answer:
According to your answers last quarter for number 1
Number 2 waxing gibbous
Explanation:
Which has more mass, 2 moles neon or 2 moles nitrogen?
Answer:
two moles noen
so yeah that's my answerEnergy 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)
Whats the noble gas configuration for platinum?
Answer:
[Xe] 4f14 5d9 6s1
Explanation:
Find the % composition of hydrogen in hydrogen sulphide
Answer:
5.88%
Explanation:
percent composition depends on relative atomic mass.
the percentage of component present in a compound is
(relative formula mass of component
÷
relative formula mass of compound)
⋅
100
%
the relative atomic mass of
H
(hydrogen) is
1
the relative formula mass of
H2 is 2
the relative atomic mass of S (sulphur) is 32.
2+32=34 the compound H2S is known as hydrogen sulphide.
relative formula mass of
H2÷relative formula mass of (H2S)⋅100%=2/34⋅100%=5.88% (2d.p.)
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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please answer this question for me I will answer your questions too I promise!!
Answer:
C
Explanation:
The airplanes speed would decrease
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]
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.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.
Please help me the picture is above, I’ll mark as brainliest.
If 33.4 g of CO2 is produced in the reaction of C2H2 with O2 to form CO2 and H2O how many grams of H2O are Produced in this reaction
Answer:
Explanation:
2C₂H₂ + 5O₂ = 4CO₂ + 2H₂O .
CO₂ formed in moles = 33.4 / 44 = .76 moles
4 moles of CO₂ is formed by 2 moles of C₂H₂
.76 moles of CO₂ is formed by .38 moles of C₂H₂
.38 moles of C₂H₂ were present initially
2 moles of C₂H₂ produces 2 moles of water
.38 moles of C₂H₂ produces .38 moles of water
water produced = .38 moles
= .38 x 18 = 6.84 grams of water .
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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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:
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:
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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Which could be a reason viruses are considered nonliving things?
which could be a reason virus are considered non living things
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:
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
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.
Which bond is the longest?
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
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.
4.85 x 10^-4 tons to cups
1.10 x 10^5 mg to cups
4.85 x 10^-4 tons to cups
please answer i have a project lol
Answer:
2.08753919851 cups
0.464942810185139 cups
2.08753919851 cups
Explanation:
i looked it up
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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Which of the following forms of invisible light, would have the highest wavelength?
Group of answer choices
you snap chatting your friends
a microwave warming up some mac-n-cheese
someone getting dental x-rays taken
a set of U/V (ultraviolet) lights sanitizing the lab safety glasses
Answer:
you snap chatting your friends
Explanation:
The waves that will have the highest wavelength from the given choices is by snap chatting with your friends.
Snap chatting involves the use of radio waves. Radio-waves are a part of electromagnetic waves and they have very long wavelength. It is used in radio communications as in mobile phones. x-rays have the shortest wavelength of all the waves.