Answer:
Frequency of the ultrasonic sound, f=1000kHz=10
6
Hz
Speed of sound in air, V
a
=340m/s
The wavelength (λ
r
) of the reflected sound is given by the relation:
λ
r
=V/f
=340/10
6
=3.4×10
−4
m.
(b) Frequency of the ultrasonic sound, f=1000kHz=10
6
Hz
Speed of sound in water, V
w
=1486 m/s
The wavelength of the transmitted sound is given as:
λ
r
=1486/10
6
=1.49×10
−3
m.
What is the name of the colony shown?
Answer:
The one that is in dark green is (New Hampshire)
if that's not what tell me i will fix it
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Please help me on this question
How exactly are synthetic paint brushes made? Nylon?
Answer:
Synthetic brushes are typically made from nylon bristles. Other times, they're made from plastic#CARRYONLEARNINGBY : EDLYN MORENO
15. The bird flu, also known as influenza A, is caused by a virus. Pneumonia, which can have similar symptoms to
influenza A, is caused by a bacterial infection. Which statement best summarizes the difference between these two
diseases?
O Viruses are living organisms while bacteria are not.
O Viruses are non-living organisms while bacteria are living.
O Bacterial infections are harmless to humans while viruses can be deadly.
Bacterial infections are harmful to humans while viruses can be beneficial.
Which pair of molecules has hydrogen bonding interactions?.
Answer:
Hydrogen bonding is a special type of dipole-dipole interaction that occurs between the lone pair of a highly electronegative atom (typically N, O, or F) and the hydrogen atom in a N–H, O–H, or F–H bond.
When placed in a cloud chamber, a radioactive substance does which of the following?
a. Leaves a trail of condensed water vapor.
b. Produces an electric current.
c. lonizes chemicals on the film present in the chamber.
d. Causes a liquid to reach its boiling point.
Which hydrocarbon is unsaturated?
Convert these pressures:
820 mm Hg =____ atm
206 kPa =
atm
0.6 atm =
kPa
1520 mm Hg = __ kPa
850 kPa =
mm Hg
What happens when a saturated solution is further heated?
Answer:
If a saturated solution is heated to a higher temperature, it becomes unsaturated. Hence, the saturation point of a solution increases with the increase in temperature as there is an increase in solubility of the solute.
Explanation:
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Which functional group is found in methanol? r single bond o single bond r. single bond n h subscript 2 single bond o h. r single bond x.
The functional group found in methanol is as follows: R single bond OH (R-OH). Details about methanol can be found below.
What is functional group?A functional group is a specific grouping of elements that is specific to a class of compounds, and determines the chemical properties of that class.
Each hydrocarbon or organic compound have a specific functional group characteristics of its group.
Alcohol (OH) is the functional group of certain organic compounds like methanol, ethanol etc. Therefore, the functional group found in methanol is as follows: R single bond OH (R-OH).
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Answer:
R single bond O single bond R.
Single bond N H Subscript 2
Single bond O H.
R single bond X.
Explanation:
What is the mass of NaCl required to make 160 grams of a 12% solution of NaCl in water?
18 grams
19 grams
22 grams
24 grams
Answer: 19 grams
Explanation:
percent by mass = (mass of part)/(mass of whole) * 100
this means that in this question, 12 = x/160 * 100, where x is the amount of NaCl.
this means 12/100 = x/160, and thus x = (160)(12/100)=19.2 grams
The closest option is B.
Answer:
Second Option: 19 grams
Explanation:
Total solution weight: 160 grams
percent of NaCl in the solution: 12%
You take these two numbers and multiply them with 12 being over 100:
160 * [tex]\frac{12}{100}[/tex] = 19.2 grams
and then just round to the nearest whole number: 19 grams
Convert these temperatures to Celsius:
a. 303 K
d. 45 K
303K − 273.15 = 29.85°C
45K − 273.15 = -228.1°C
V. What volume of nitric oxide will diffuse out of a porous partition in 10 seconds when 25 ml of methane diffuse out in 4 seconds?
The volume of nitric oxide that will diffuse out of the partition in 10 seconds when methane diffuses is 62.5 mL
What is rate of diffusion?This is defined as the amount diffused per unit time. Mathematically, it can be expressed as
Rate = volume / time
How to determine the rate of diffusion of methaneVolume of methane = 25 mLTime = 4 sRate = ?Rate = volume / time
Rate = 25 / 4
Rate = 6.25 mL/s
How to determine volume of nitric oxideTime = 10 sRate = 6.25 mL/sVolume of nitric oxide = ?Rate = volume / time
6.25 = volume of nitric oxide / 10
Cross multiply
Volume of nitric oxide = 6.25 × 10
Volume of nitric oxide = 62.5 mL
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In order to be healthy, humans must consume a variety of amino acids. any animal product, such as eggs, milk, and meat, contains all of these amino acids. however, consumption of a wide variety of plant products will also supply the necessary amino acids. describe two different meals you could enjoy that contain only plant products. make sure to include at least five different plants in each meal. (10 points) plants produce grains, vegetables, and fruits. meal two
Dish of Cabbage, carrot, pea, cauliflower and brinjal are the meals we could enjoy that contain only plant products.
Describe two different meals you could enjoy that contain only plant products?
Cabbage, carrot, pea, cauliflower and brinjal are the five different plants based meals. In these meals, vegetables are used which are the parts of plant. We know that vegetables are very healthy and nutritive which can be get from plants.
So we can conclude that dish of Cabbage, carrot, pea, cauliflower and brinjal are the meals we could enjoy that contain only plant products.
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The original amount of a radioactive sample should be multiplied by which expression to calculate the amount of the sample that remains after n half-lives have passed? (one half) times n. (startfraction 1 over n endfraction) squared. (one half) superscript n. startfraction 1 over (2 n) endfraction.
The original amount of a radioactive sample should be multiplied by (one half) superscript n to calculate the amount remaining.
What is half-life?This is the time taken for half a substance to decay.
Description of number of half-livesThe number of half-lives a substance has undergone is related to its original amount as and amount remaining according to the following equation:
N = N₀ × (½)ⁿ
Where
N is the amount remainingN₀ is the Original amount n is the Number of half-livesFrom the above equation, we can conclude that the original amount of a radioactive sample should be multiplied by (one half) superscript n
to calculate the amount remaining.
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Answer:
c. (1/2)^n
Explanation:
How many grams of sodium hydroxide, NaOH, are needed to make 355.0 mL of a 4.75M solution? The molar mass of NaOH is 40.00 g/mol
Answer:
4198.97404999
Explanation:
In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.
Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.
If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.
Which of these statements is false? The least reactive elements are in the far right column. Elements at the bottom of a column have more protons than elements at the top of a column. Elements on the left side of a row always have higher atomic mass than elements on the right side of that row. Elements along the steplike line have some properties of metals and some properties of nonmetals.
Answer:
Elements on the left side of a row always have higher atomic mass than elements on the right side of that row.
Explanation:
the answer I have above should be correct because it’s false so it’s the right answer.
what type of rock is the Wave made of?
What type of rock is the wave made of?
Answer: The Wave is a natural formation of ~sandstone rocks~
Name two other substances with giant covalent substances
Answer:
diamond, graphite (types of carbon) and silicon dioxide (silica).
Explanation:
Substances with giant covalent structures are solids with very high melting points. All the atoms are linked by strong covalent bonds, which must be broken to melt the substance.
Balanced chemical equation for the combustion of biodiesel
Answer:
carbon dioxide + water+ energy+ soot+carbon monoxide
what is the answer to this question? i do not know what the names are
The answer is Ethene.
Produced by heating natural gas.
What are some of the benefits of being able to predict natural disasters and knowing when and where they might occur?
What is the compound Cu₂SO4 called?
Answer:
Cu2SO4 is referred to as copper sulphate
At home, your parents replace your house lights with lower-watt bulbs. Is this energy conservation or energy sustainability? Explain
This is actually electricity
The replacing of house lights with lower-watt bulbs represents energy conservation not energy sustainability because energy conservation is the efficient use of energy without wasting it.
What is energy conservation?Energy conservations refer to the practice of using less energy for doing various activities. Turning off the light when you leave the room is the example of energy conservation.
So we can conclude that replacing of house lights with lower-watt bulbs represents energy conservation not energy sustainability because energy conservation is the efficient use of energy without wasting it.
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balance following equation
H2 + _02 → _H20
Answer:
2H2+O2=2H20
Explanation: Since there are 2 Oxygen in the reactants then there must be 2 Oxygen in the products, meaning there is a coefficient of 2 in front of H20 and that makes there be 4 Hydrogen, so adjust the reactants (2 H2)
Balance the following reaction:
C5H8 + _____ O2 ________ CO2. + _______ H2O
How much heat (q) will be released by water, H2O, if 34 grams of C5H8 reacts? Hint: This is a stoichiometry problem, before it’s a thermochemistry problem.
Balanced one
2C_5H_8+13O_2—»10CO_2+8H_2OMoles of Pentyne
Given mass/Molarmass34/680.5molMoles of H_2O
8/2(0.5)4(0.5)2mol1mol releases 241.8KJ
2mol releases 241.8(2)=483.6KJ
What would happen if the student did not stop the development before the solvent reached the top of the paper
Answer:
The solvent would wash away the dye.
Explanation:
The solution will m ove to the top and you would not be able to calculate the Rf value that is com pared to the distance that a com ponent traveled in the stationary phase reached by the solvent.
Answer:
The solvent would wash away the dye.
Explanation:
The solution will m ove to the top and you would not be able to calculate the Rf value that is com pared to the distance that a com ponent traveled in the stationary phase reached by the solvent.
Select the correct answer. which characteristic is a property of water? a. densest as a solid b. low surface tension c. nonpolar molecules d. strong cohesion e. weak adhesion
The statement that is a characteristic of water is strong cohesion. Details about characteristics of water can be found below.
What are the characteristics of water?Water is a unique molecule which is attributed to its unique characteristics or features.
Water is made up of two hydrogen atoms and one oxygen atom that are chemically bonded to one another.
Some of the characteristics of water are as follows:
Water is a very polar moleculeWater is a universal solventWater has high surface tensionWater has high specific heat capacityWater is less dense as a solid than as a liquidWater has strong cohesive and adhesive propertiesWater has high boiling and freezing pointsTherefore, the statement that is a characteristic of water is strong cohesion.
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65. Write an equation for the combustion of octane.
Answer:
2C8H18+25O2→16CO2+18H2O.

which ph value is consistent with the indicator results
The color of the indicator will correspond to the pH values of either acidic or basic substances.
What are pH values and Indications?pH values are values which are obtained from taking the negative logarithm to base ten of the hydrogen ions concentration of a substance.
pH values of acidic substances are less than 7 while the pH of basic or alkaline substances are greater than 7.
An indicator is an organic dye which changes colour according to the pH of a substance.
Examples of indicators are methyl orange and phenolphthalein.
Therefore, the color of the indicator will correspond to pglh values of either acidic or basic substances.
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