Answer:
0,1 mol
Explanation:
We know that the formula of concentration is C= moles of solute/ volume
0,4 M= moles of solute/ 250 mL
Convert mL to L 250 mL =0,25 L
0,4 M x 0,25 L= moles of solute
0,1 moles= moles of solute
a rock that can float if placed in water
Answer:
Anything that has less density than water will float on water.
Explanation:
Come on! It's basic knowledge!
What type of reaction is shown below? Check all that apply. 2Mg+O2—> 2MgO
Answer:
Reaction types are :
Combination(Mg and O combine)Oxidation (O added to Mg)Exothermic (light and heat released)Answer:
Synthesis and Combustion
Explanation:
For edge
e
Coal and petrol are called non-renewable sources of energy,why
Answer:
because they take thousands or even millions of years to naturally replenish or replaced , which is not the average human lifetime
if 600.0 ml of air is heated from 293 k to 333 k what volume will it occupy
Answer:
Explanation:
V1= 600.0 mL
T1= 293 K
V2 unknown
T2= 333K
Charles law V1*T2=V2*T1
where V1 and T1 are the initial volume and temperature. V2 and T2 are the final temperature and volume.
V2=(V1*T2)/T1 = ( 600.0*333)/293= 682 mL (with significant figures)(681.911 mL before signifcant figures.)
5.2 G of HCl are dissolved in 25 mL of solution. What is the molarity?
A) 0.21 M
B) 210 M
C) 0.0057 M
D) 5.7 M
Answer:
0.21 M
Explanation:
Molarity is the calculation of the solution in which the number of solute per liter of the solutions. It is the most common measurement unit that is used to measure the concentration of the solution.
The molarity is the unit that is used to measure or calculate the volume of the solvent. The amount of solvent is used in the chemical reaction.
The amount of the two solvent in the same quantity is measured by the formula called c1v1 and c2v2.
Which is an example of a beneficial mutation? ANSWERRRR HELPPP !!!
choices : one that changes the color of a rabbit, allowing it to hide from predators.
one that results in lighter flower petal colors without changing the plant’s ability to reproduce
one that causes a person’s body to produce thick mucus that clogs the lungs
one that makes it easier for a corn plant to contract a disease
Answer:
A
Explanation:
Mutation can be defined as the change in the genetic sequence that is hereditary. The example of beneficial mutation can be the change of rabbit color to help him hide from the predators.
What are mutagens?The mutation can be caused by the exposure of the gene sequence to the mutagen that cause the hereditary change.
The mutagens can be UV radiation, high energy, radiation, chemicals, or environmental factors.
The beneficial mutation can be given as the mutation in which the organism has been benefitted. The change in the color pf rabbit benefit him in hiding from the predators. Thus, option A has been the example of the beneficial mutation.
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describe the light spectrum of a star
Answer:
The visible light spectrum is the section of the electromagnetic radiation spectrum that is visible to the human eye. Essentially, that equates to the colors the human eye can see. It ranges in wavelength from approximately 400 nanometers (4 x 10 -7 m, which is violet) to 700 nm (7 x 10 -7 m, which is red).
(Hope this helps) Sky
Gasoline is used to power most of the cars in the United States and worldwide. The average fuel economy for a gasoline powered car is about 32 miles per gallon. The average car in the U.S. Is driven about 15 000 miles (24 000 kilometers) per year. Calculate the number of gallons of gasoline that are combusted by the average car in the U.S. Each year.
Answer:
469 gallons
Explanation:
From the question given, we were told that:
For every 32 miles, 1 gallon of gasoline is consumed.
With the above information, we can obtain the number of gallon of gasoline consumed by a car per year i.e 15000 miles
This is illustrated below:
If 32 miles consumed 1 gallon of gasoline,
Therefore, 15000 miles will consume = 15000/32 ≈ 469 gallons of gasoline.
Therefore, 469 gallons of gasoline is consumed by the average car each year
The
which statement correctly describes a scienfic theory
Answer:
B) It is based on repeated investigations.
Explanation:
If this is your question:
Which statement correctly describes a scientific theory?
A) It is accepted as true indefinitely.
B) It is based on repeated investigations.
C) It is equivalent to a scientific law.
D) It is accepted as false.
Test
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Which planets are terrestrial? Select three options.
Jupiter
Mars
Mercury
Uranus
Venus
Mark this and retum
Save and Exit
Nex
Answer:
mercury, mars, venus
Explanation:
Mixtures are made up of what substances.
Answer:
A mixture is a material composed of two or more simpler substances in chemistry.
Explanation:
What is the total number of hydrogen atoms in a molecule of heptyne?
Answer:
12
Explanation:
alkyne formula is CnH2n-2
heptyne = 7
The total number of hydrogen atoms in a molecule of heptyne is twelve (12).
What is heptyne?Heptyne belong to alkyne family with one triple bond and the molecular formula can be determined as follows;
CₙH2ₙ-2
Heptyne contains 7 carbons
C7H[2x 7 - 2] = C7H12
Thus, we can conclude that, the total number of hydrogen atoms in a molecule of heptyne is twelve-12.
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The equation for photon energy, E, is E=hcλ where h = 6.626×10−34 J⋅s (Planck's constant) and c = 2.99×108 m/s (the speed of light). What is the wavelength, λ, of a photon that has an energy of E = 4.61×10−19 J ?
Answer:
9.133×10^-6 m
Explanation:
A photon is the smallest discrete amount or quantum of electromagnetic radiation. It is the basic unit of all light. Photons are always in motion and, in a vacuum, travel at a constant speed to all observers of 3 x 10^8 m/s.
From the question, the following details were supplied;
Energy of the photon (E) = 4.61×10^−19 J
Speed of light (c) = 2.99×10^8 m/s
Plank's constant (h) = 6.626×10^−34 J⋅s
Wavelength of the photon (λ)= ??? The unknown
From
E=hc/λ
λ= hc/E
Substituting values
λ= 6.626×10^−34 × 2.99×10^8/ 4.61×10^−19
λ= 91.33×10^-7 m
λ= 9.133×10^-6 m
true or false applied chemistry does not have a specific goal or application
Answer:
False. The goal of chemistry is to accumulate knowledge. Sometimes true. Biochemistry involves ... Sometimes true. Applied Chemistry is used to attain specific goals ... Applied Chemistry.
Explanation:
I really hope this helped :)
Give the formula for the alkane containing 100 hydrogens.
Answer: The alkane containing 100 hydrogens will be [tex]C_{49}H_{100}[/tex]
Explanation:
Saturated hydrocarbons are defined as the hydrocarbons in which a single bond is present between carbon and carbon atoms.These are called as alkanes. The general formula for these hydrocarbons is [tex]C_nH_{2n+2}[/tex]
As given number of hydrogen atoms is 100, therefore the value of (2n+2) = 100
2n = 98
n = 49
Thus the formula for the alkane containing 100 hydrogens will be [tex]C_{49}H_{100}[/tex]
The formula for the alkane containing 100 hydrogens is [tex]C_{49}H_{100[/tex]
Saturated hydrocarbons:It refers to hydrocarbons where a single bond is present that lies between carbon and carbon atoms. These are known as alkanes. The general formula for these hydrocarbons is [tex]C_nH_{2n+2}[/tex]
Since the given number of hydrogen atoms is 100, so the value of (2n+2) = 100
So,
2n = 98
n = 49
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If oxygen, which has an electronegativity of 3.5, bonds with hydrogen, which
has an electronegativity of 2.1, the bond between the two atoms will be classified as a polar BLANK
bond.
Answer: covalent bond
Explanation: Yeah that's the answer
what substances have an arrhenius base?
If anyone is good at figuring out the amount of heat released in chemistry PLS HELP!!!!!
Answer:
Option (3) 334J.
Explanation:
The following data were obtained from the question:
Mass (m) = 1g
Heat of fusion (ΔHf) = 334J/g
Heat (Q) =?
The heat released can be obtained as follow:
Q = m·ΔHf
Q = 1 x 334
Q = 334J.
Therefore, the heat released when 1g is converted to ice is 334J.
largest electronegativity element
Answer:
Fluorine (F)
Explanation:
As you move to the right across the periodic table, the electronegativity increases. As you move up a group, the electronegativity increases.
This means that the most electronegative element is fluorine.
give two sources of energy that can cause ocean waves
Explanation:
Thermal energy from the sun's heat, and mechanical energy from previous tides and waves. Oceans are one of the largest solar collectors.
In this group, which percentage does the green seed
represent?
25%
50%
75%
100%
Answer:
ITS A 25% trust me
Answer:
I think it is 25%
Explanation:
If 50g of calcium carbonate is heated, what mass of calcium oxide is formed
Answer:
22 g of CO2 are obtained from decomposition of 50 g of CaCO3
Explanation:
A gas has a pressure of 25 atm at 303 K . What is the temperature if the pressure drops to 20 atm?
Answer: But Thats Aight
Explanation: 301
Earthquakes occur along the San Andreas Fault in California. Which
statement best describes plate motion in that area during the time between
earthquakes?
a. Plate motion stops; stress and potential energy between the plates
decrease.
b. Plate motion continues; stress and potential energy between plates
increase.
C. Plate motion stops; only the mantle moves.
d. Plate motion reverses; plates return to their original positions.
What is the condensed formula for 2-pentyne??
Answer:
C5H8
Explanation:
The condensed formula is also known as structural formula of a chemical compound which shows a graphical representation of the molecular structure that represents, the arrangement of the atoms in the three-dimensional space.
The condensed formula of 2-pentyne is C5H8.
There is a triple bond between two carbon atoms at second carbon as shown in the figure.
Which resources MAY be used by autotrophs to make their food?
1. oxygen
2. glucose
3. soil
4. carbon dioxide
5. hydrogen sulfide
(A) 1 and 2
(B) 2 and 3
(C) 3 and 4
(D) 4 and 5
Answer:
The answer is C.
Explanation:
Plants get minerals from the soil and take in carbon dioxide from the air to photosynthesize in order to make their food .
The resources that may be used by autotrophs to make their food are soil and carbon dioxide. The (C) 3 and 4
Who are autotrophs?Autotrophs include algae, plants, certain bacteria, and fungi. Autotrophs are the food chain's producers because they make their own energy and nutrients. Like the majority of autotrophs, kelp produces energy through a process known as photosynthesis.
Photosynthesis, the method used by plants and other autotrophic organisms to make food, converts carbon dioxide into glucose and oxygen, both of which are vital for life.
Soil gives nutrition and water to the plant and water is used in the process of photosynthesis and carbon dioxide is also used in the process.
Therefore, the correct option is (C) 3. Soil and 4. Carbon dioxide.
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Why do you think adding water (dilution) changes how acidic or basic the liquid is? Explain your thinking.
Answer:
Diluting an acid reduces the concentration of the H+ ions that cause acidity, while diluting a base reduces the concentration of the OH- ions that cause basicity.
Explanation:
The pH scale covers a range between 0 and 14 pH. A pH of exactly 7 is neutral. pH values greater than 7 are basic, while pH values less than 7 are acidic. The pH scale is logarithmic with a base of 10, meaning each integer pH value is 10 times more acidic or basic than the one preceding or succeeding it respectively. For dilution to decrease the acidity or basicity of a solution, the solvent being used must be less acidic or basic than this solution.
Alternatively, an acidic diluent may be used to dilute a basic solution, or vice versa, in a neutralization reaction. Because of the logarithmic nature of the pH scale, diluting a strong acid or base even slightly causes its respective pH to rise or drop considerably. Weak acids and bases with pH values close to 7 are correspondingly not as affected by dilution.
Dilution decreases the amount of acid or base molecules in the liquid thereby making the liquid less acidic or basic.
How basic or acidic a liquid is has to do with the amount of solute present in the liquid.
Note that the liquid is actually a solution. The acid or base was dissolved in water and two scenarios are possible;
Amount of water greater than the amount of acid or base, in which case the solution is diluteAmount of acid or base greater than amount of water, in which case the solution is concentrated.The more the amount of acid or base present, the more acidic or basic the liquid is.
So, if I add more water in such a way that amount of water exceeds the amount of acid or base present in the liquid, the liquid is now less acidic or basic because it contains less acid or base molecules compared to water molecules.
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A planet's orbit around the sun affect's the planet's ability to support life
true
false
Answer:True i believe
Explanation:
A gas’s pressure is 765 mm Hg at 23°C. At what temperature in celsius will the pressure be 560 mm Hg?
Answer:
216 K
Explanation:
T2=T1P2/P1
Change C to K
A yellow solution of iodine in water is shaken with an equal volume of tetrachloromethane describe and explain what happens
Answer:
See the answer below
Explanation:
When a solution of iodine is mixed with a solution of tetrachloromethane, the mixture turns purple due to the formation of [tex]I_2(CCl_4)[/tex].
Iodine solution dissolves in carbon tetrachloride solution (another name for tetrachloromethane) due to the fact that both solutions are similarly non polar in nature. The equation of the reaction is as shown below:
[tex]I_2 + CCl_4 --> I_2(CCl_4)[/tex]