Which is the metric root for length?
a. gram
b. liter
c. meter
d. second
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Related Questions
Which statement defines the heat capacity of a sample?
If the Kb of a weak base is 4.6 × 10-6, what is the pH of a 0.32 M solution of this base?
1-How many atoms are present in 4.0mol of sodium?2-Convert 3.01 x 1023 atoms of Silicon to moles of Silicon?
A student determines that according to the reaction N2(g) + 3H2(g) --> 2NH3(g), if 34g of nitrogen gas is reacted with excess hydrogen, 41g of ammonia can be produced. When the actual reaction was complete, only 38g of ammonia formed. Determine the percent yield for the reaction.
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Considering the definition of molar mass, 1.26 moles are in 98.3 grams of aluminum hydroxide, Al(OH)₃.
The given molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
In this case, you know the molar mass of the elements is:
- Al= 27 g/mole
- O= 16 g/mole
- H= 1 g/mole
So, the molar mass of the compound Al(OH)₃ is calculated as:
Al(OH)₃= 27 g/mole + 3× (16 g/mole + 1 g/mole)
Solving:
Al(OH)₃= 78 g/mole
Next, you can apply the following rule of three: if 78 grams of the compound are contained in 1 mole, 98.3 grams are contained in how many moles?
amount of moles= 1.26 moles
1.26 moles are in 98.3 grams of aluminum hydroxide, Al(OH)₃.
Learn more:
Atomic mass (Al)=27 amu
Atomic mass (O)=16 amu
Atomic mass (H)=1 amu
molecular weight= 27 amu+3(16 amu + 1 amu) =78 amu.
Therefore, the molar mass of Al (OH)₃ is 78 g/ mol
Now, we calculate the number of moles in 98.3 g of aluminum hydroxide.
78 g-------------------1 mol
98.3 g----------------- x
x=(98.3 g * 1 mol) / 78 g=1.26 moles.
Answer: 1.26 moles.
O B. conjugate acid to conjugate base
O C. conjugate base to conjugate acid
OD. solute to the amount of solvent in a solution
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Answer:
Option C
Explanation:
A buffer aqueous solution consists of
a) either a weak acid along with its conjugate base
b) or a weak base along with its conjugate acid.
This is used to prevent change in the pH of a solution whenever an acid or a base is added. The pH of a buffer depends upon the ratio of base to acid and this ratio is determined by the Ka value and Henderson-Hasselbalch equation. An ideal buffer has equal amounts of acid and conjugate base
Hence, option C is correct
c. Silverpoint
b. Ink painting
d. Liquid media
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Answer : Option A) Dry media
Explanation : i) Dry media is a media that deposits graphite, charcoal, pastels, ordinary pencils, then moistened with a wet brush to get various painterly effects on the paper fibers.
ii) Silverpoint - Silverpoint media uses red chalk or traces of black pencil on white-coated paper usually the manuscripts,
iii) Ink Painting - Uses various inks on the paper.
iv) Liquid media - uses liquid pigments suspended in some base which in liquid state that soaks the paper.
B. The volume of a gas varies directly with pressure.
C. The temperature of a gas varies inversely with pressure.
D. The temperature of a gas varies directly with pressure.
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That is because temperature has an SI unit of Kelvin, and also deals directly with pressure.
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Answer: Out of all the options presented above the one that cannot be used to define a base is answer choice A) a hydronium ion donor in a reaction. As we already know a base is a compound that is a proton (H¹⁺) acceptor.
I hope it helps, Regards.
B
It changes direction when it passes through an opening
С
It changes its speed and wavelength when it passes through an opening
D
It changes direction when it passes from one medium to another
E
It changes its speed and wavelength from one medium to another.
F
It changes direction when it bounces off of a solid surface.
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If a sound wave refracts,It changes its speed and wavelength when it bounces off of a solid surface,It changes its speed and wavelength when it passes through an opening, and It changes direction when it passes from one medium to another. Therefore, option A, C and D are correct.
What is refraction of sound wave ?
An important case in which sound waves change form or spread out is called refraction. This phenomenon affects the bending of a sound wave owing to changes in the wave's speed.
Refraction is the reason ocean waves near a shore parallel to the beach and why glass lenses can be used to focus light waves.
If the air above the earth is warmed than that at the surface, sound will be change shape back downward toward the surface by refraction. Soundpropagates in all directions from a point source.
Thus, option A, C and D are correct.
To learn more about the refraction of sound wave, follow the link;
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