Answer:
Explanation:So if a neutron or two is added or removed from the nucleus, then the ... For example Cl–35 has an atomic mass of 35 u (17 protons and 18 neutrons), while Cl–37 ... Calculate the mass contribution of chlorine–35 to the average relative atomic mass ... Which of the following are isotopes of 3517Cl? 1735Cl. 3517Cl. 3717Cl.
14. Compare between the plasticity of edge and screw dislocations in BCC metals 15. Why does a screw dislocation in a BCC metal needs high thermal activation to move?
Answer:
14) The edge dislocation is more plastic than the screw dislocation
15) So as to form kinks that are fast moving
Explanation:
14) Edge and screw dislocations are the two main types of mobile dislocations
The three dimensional core of the screw dislocation prevents the slipping of the layers (one over the other) in a BCC metal such that kinks are required to be formed first by thermal activation (heating) in order. The kinks are edge dislocation that move such that the screw dislocation moves forward
Hence, the edge dislocation is more plastic than the screw dislocation
15) The three dimensional structure of a screw dislocation acts like a wedge which resists the slipping of the layers in the BCC structure such that the screw dislocation needs to be highly thermally activated forming kinks before the surrounding layers can move.
what is upthrust? name the factor that affect the upthrust.
The upthrust keeps a ship afloat. The upthrust keeps swimmers on top of the water. Things weigh less in water.
The upward force exerted on a body by the fluid in which the body is submerged is called the upthrust or buoyant force. The property of liquid to exert an upward force on a body immersed in it is called buoyancy. Being a force upthrust is measured in newton or kgf in the system of international units. Examples Pushing an empty can into water experiences the buoyant force. Pushing a cork into water into water experiences the buoyant force. Reason for Upthrust The thrust ating on on the sides of walls of the body get neutralised because they are equal in magnitude and opposite in the directions. There is a pressure difference between the lower and upper faces of block. Since force is the product of pressure and area, The difference in pressure due to liquid is on th two faces of causes a net upward force called upthrust on the body immersed in the fluid.
Answer: upthrust an upward force exerted by a fluid that opposes the weight of an immersed object.It is the force that pushes an object up. ... the upward force that a liquid or gas exerts on a body floating in it.
When a body is placed in water, Up thrust = V x d x g
From the above formula we can say that the following are the factors that affect up thrust:
Acceleration due to gravity - (g)
Density of the liquid - (d)
Volume of the body submerged in the liquid - (V), or volume of the liquid displaced (v)
Explanation:
Which is the correct skeleton equation for water + sodium sod hydroxide + hydrogen ?
Answer:
H₂O + Na → NaOH + H₂
Explanation:
Firstly, a skeleton equation does not reflect the relative amount of reactants and products. A skeleton reaction only identifies the reactant and product by their chemical formula but it does not quantify them. A skeleton chemical equation is simply described as an unbalanced equation.
The question asked for the correct skeleton reaction of water and sodium to produce sodium hydroxide and hydrogen.
Let us represent them with their chemical formula
Water → H₂O
Sodium → Na
Sodium hydroxide → NaOH
Hydrogen → H₂
The skeleton reaction will be
H₂O + Na → NaOH + H₂
How did plastics become the material of choice for so many varied applications?
Answer:
people as: it Is less expensive. easy to carry
Which of these does not describe the process the Wright brothers used to
create the first airplane?
A. The Wright brothers figured out how to outfit the plane with wings
that flapped, similar to birds' wings,
B. The Wright brothers used wind-tunnel tests to evaluate their
designs
C. The Wright brothers used the engineering process to come up
with its design.
D. The Wright brothers tested several model planes with similar
designs
Answer: A. The Wright brothers figured out how to outfit the plane with wings that flapped, similar to birds' wings,
Explanation: A p e x
Answer:
A
Explanation:
A p e x
10 moles of carbon dioxide has a mass of 440 g. What is the relative formula mass of carbon dioxide?
Answer: 44g
Explanation: The formular for finding Moles is ;
Moles = Mass / Molar Mass or Formular Mass.
Base on this question; Moles = 10, Mass = 440g, and Formular Mass = ?
Making 'Formular Mass', subject of the formular; we thus have;
Formular mass = Mass / Moles = 440/ 10 = 44g
what element has a proton number of 79?
Which method of moving materials in and out of a cell requires energy?
active transport
passive transport
osmosis
diffusion
Answer:
Active Transport
Explanation:
As the name suggests, in active transport you need energy to move materials in and out. Similar to how if you want to be active you need energy, same goes with movements in our cells as well.
What's the molarity of the solution containing 10 g of NaCN in 250 mL of solution?
Answer:
0.816
Explanation:
1 mole of NaCN is
Na = 23
C = 12
N = 14
Total = 49 grams / mole (just add 23 + 12 + 14)
moles when only 10 grams of NaCN are used.
moles = grams/molar mass
grams = 10
molar mass = 49
moles = 10 / 49
moles = 0.204 moles
Volume in Liters
250 mL = 250mL/1000 mL / Liter = 0.25 Liters
Molarity
M = m/V
M = 0.204/0.25 = 0.816
If 12.5 grams of strontium hydroxide is reacted with 150 mL of 3.5 M carbonic acid, identify the limiting reactant.
Answer:
Sr(OH)₂ will be the limiting reagent.
Explanation:
First of all, you should know the following balanced chemical equation:
2 H₂CO₃ + 2 Sr(OH)₂ → 4 H₂O + Sr₂(CO₃)₂
The balanced equation is based on the Law of Conservation of Mass, which says that matter cannot be created or destroyed. Therefore, the number of each type of atom on each side of a chemical equation must be the same.
The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
To determine the limiting reagent, it is possible to use the reaction stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction). By stoichiometry the following amounts in moles react:
strontium hydroxide: 2 molescarbonic acid: 2 molesNow, you know the following masses of the elements:
Sr: 87.62 g/moleO: 16 g/moleH: 1 g/moleSo the molar mass of strontium hydroxide is:
Sr(OH)₂= 87.62 g/mole + 2*(16 g/mole + 1 g/mole)= 121.62 g/mole
You apply the following rule of three, if 121.62 grams of hydroxide are present in 1 mole, 12.5 grams in how many moles are they?
[tex]moles of strontium hydroxide=\frac{12.5 grams*1 mole}{121.62 grams}[/tex]
moles of hydroxide= 0.103 moles
On the other hand, you have 150 ml of 3.5 M carbonic acid. Since molarity is the concentration of a solution expressed in the number of moles dissolved per liter of solution, you can apply the following rule of three: if in 1 L there are 3.5 moles of carbonic acid, in 0.150 L (being 1 L = 1000 mL, 0.150 L = 150 mL) how many moles of acid are there?
[tex]molesofcarbonicacid=\frac{0.150 L*3.5 moles}{1 L}[/tex]
moles of carbonic acid= 0.525 moles
Finally, to calculate the limiting reagent, you can use a simple rule of three as follows: if by stoichiometry 2 mole of strontium hydroxide reacts with , how much moles of carbonic acid will be needed if 0.103 moles of strontium hydroxide react?
[tex]molesofcarbonicacid=\frac{0.103 moles of strontium hydroxide*2 moles of carbonic acid}{2 moles of strontium hydroxide}[/tex]
moles of carbonic acid= 0.103 moles
But 0.525 moles are available. Since more moles are available than you need to react with 0.103 moles of strontium hydroxide, Sr(OH)₂ will be the limiting reagent.
which indicator has to be used in order to get an emerald green color at a pH of 9?
a) universal indicator
b) methyl orange indicator
c) thymol blue indicator
d) cyanidin
Answer:
D) Cyanidin indicator
Explanation:
Cyanidin indicator has to be used in order to get an emerald green color at a pH of 9.
What is an indicator?Indicators are substances that change colour when they are added to acidic or alkaline solutions.
In nature, cyanidin is a reddish-purple (magenta) pigment. It is the major pigment in berries [4] and other red-coloured vegetables such as red sweet potato and purple corn. It appears as a blue-reddish or purple pigment in the plant.
Cyanidin indicator has to be used in order to get an emerald green colour at a pH of 9.
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Which characteristic gives the most information about what kind of element
an atom is?
A. The atomic number
B. The atomic mass
C. The number of electrons
D. The number of neutrons
Answer:
A. The atomic number
the anwer is B.The atomic mass because atoms may be similar atomic mass ,number of electron,proton,and neutron by the presence of isotope but no two atoms have the same atomic number
49 grams of sulfuric acid, H2SO4, is dissolved in 1 liter of solution. Determine the molarity (M).
Answer: .5m
Explanation:
In a chemical reaction equation, which side of the arrow is the reactant?
" A+B --> AB"
- left
- right
- there are no reactants in equations.
Answer:
Left.
Explanation:
A+B --> AB
reactants product
Cuando los volcanes entran en erupción lanzan al exterior porciones de materia muy variada ¿cuales fueron los productos de la erupción del etna y en que estados de agregación se hallaban
Answer:
The Etna volcano when it previously erupted released a lot of smoke, and then volcanic lava.
Explanation:
The eruption of this volcano was on the Italian island of Sicily.
Where there were large columns of smoke and after that the volcanic magma in a viscoelastic state was released into the external environment.
Some sources claim that the eruption of this volcano reached the areas of Zaffanera.
State two characteristics of matter demonstrated by: (a)-diffusion (b)-brownian motion
Answer:
Explanation:
a) This is to show that particles are in constant motion (and that matter is made of particles) with kinetic energy which enables particles of one matter to intermix with particles of another matter. this is known as diffusion. For example, the fragrance of a burning incense stick could be felt even at the farther end of the room because particles from the incense stick rise and intermix with the particles of air. T hey diffuse and spread all over the room.
b) Brownian motion is a constant zig-zag motion particles undergo. This can be noticed in a colloidal solution. particles of a colloidal solution remain active as they are charged with the same charge (all the particles of a certain solution carry the same charge). This causes each of them to repel from each other thus putting them into constant motion (kinetic energy). Thus, this too shows that particles are in constant motion (and that matter is made of particles).
if a car of 2 kg mass has a force of 8 Newtons exerted on it what is it’s acceleration
a) 16 m/s^2
b) 4 m/s^2
c) 0.25 m/s^2
Answer:
b) 4m/s^2
Explanation:
F=ma
F=8N
m=2kg
a=?
a=F÷m
8/2=4
acceleration=4m/s²
While hiking in Costa Rica, Bert discovers a new species of arthropod. Which characteristics should he look at to determine in which group it belongs?
Answer:
Characteristics outlined below
Explanation:
Anthropods, though they generally possess exoskeleton, segmented bodies and joint appendages, are divided into four (4) groups:
Tracheata (breath through channels in their bodies. E.g. insects)Chelicerata (More than four legs, one pir of chelicerae i.e. claw or pincer. E.g. Scorpions and spiders)Crustaceans (Have a large rigid exoskeletal, without a circulatory system. E.g. Shrimps, crabs)Trilobite (extinct three-headed/lobed marine species)10 grams of sodium hydroxide, NaOH, is dissolved in 0.25 liters of solution. Determine the molarity (M)
Answer:
1M
Explanation:
The molarity of a substance is defined as the number of moles of the substance divided by how many liters the solution is. NaOH has a molar mass of about 40 grams, meaning that 10 grams of it would be 0.25 moles. 0.25/0.25= a molarity of 1.
Hope this helps!
A gas at 127०C and 10.0 L expands to 20.0 L. What is the new temperature in Celcius? (HINT: You need to convert to Kelvins solve then convert answer back to ०C)
Answer:
526.85K
Explanation:
Based on Charles's law, the volume of a gas is directly proportional to absolute temperature. The formrula is:
V₁ / T₁ = V₂ / T₂
Where 1 represents the initial state and 2 the final state of the gas
Using the values of the problem:
V₁ = 10.0L
T₁ = 127°C + 273.15K = 400.15K
V₂ = 20.0L
Thus, replacing in the formula:
10.0L / 400.15K = 20.0L / T₂
T₂ = 800K
In Celsius:
800K - 273.15 = 526.85K
help me with this question please
Answer:
Noble gases b/c its melts quicly that why enjoy
How much is 1 mole of water molecules?
Answer:
Hey mate,
Here is your answer. Hope it helps you.
18 grams.
Explanation:
The mass of one mole of any atom/molecule is equal to its atomic molecular mass in grams.
The molecular formula of water is
H
2
O
The atomic mass of
H
= 1
The atomic mass of
O
= 16
In a sense, the formula means
H
+
H
+
O
So... 1 + 1 + 16 = 18
Therefore, the mass of one mole of water = 18 milliletres
What does “unsaturated” refer to when talking about solutions
Answer:
Not saturated
Explanation:
not saturated; having the power to dissolve still more of a substance. Chemistry. (of an organic compound) having a double or triple bond and capable of taking on elements or groups by direct chemical combination without the liberation of other elements or compounds, as ethylene, CH2 = CH2; undersaturated.
What does the kinetic theory state?
What are some possible sources of error in a titration experiment? Share some tips to minimize errors with your classmates.
Answer:
1. by not avoiding air bubbles from being trapped in the burette or pipette when filling them
2. not cross-checking the burette if it's slanted or vertically clamped
3. forgetting to rinse the pipette or burette with the solution to be used
4. not considering to take readings from the bottom of the meniscus with the eye level
5. finally, adding more than three drops of indicators to the pipetted solution
Explanation:
1. because the air bubbles will be mistakenly considered as part of the amount of the solution taken instead of that actually used up, and a higher titre value would be obtained
2. because if it's slanted, the acid level will be titled to one side and wrong reading will be recorded
3. rinsing to avoid diluting the acid or base with water that wets the burette or pipette
4. to avoid error of parallax and helps you to obtain accurate readings
5. excess burette solution than would normally have been consumed would be used up to change the colour of the indicator
Titration has been defined as the neutralization reaction for the acid and base, resulting in the formation of salt and water. It has been used for the determination of strength of acid and base.
The general source of error in titration has been;
The measurement of volume in burette by at the lower meniscus. It has been corrected with the application of measurement at eye level.The air bubble in the burette results in the incorrect measurement of the volume of burette. It can be corrected by tapping the burette or by slowing adding the solution to remove the bubble.The absence of rinsing the burette before use has been resulted in the water droplets that has been results in the incorrect measurement and dilution of the solution. The correction has been made by the use of dried burette.The titration error has generally being manual error, and can be easily corrected.
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liquids have:
A. fixed size and shape
B. fixed size but not fixed shape
C. neither fixed size or shape
Answer:
Liquids, because they flow, can occupy whatever shape their container has, so they do not have a fixed shape. Because the particles in liquids are very close together (barely further apart than in solids) liquids do not easily compress, so their volume is fixed. hope that helps love!
What is the perecentage yield of a reaction in which 200g PCl3 reacts with excess water to form 128g HCl according to the f.F reaction? PCl3 +3H2O=H3PO3+ 3HCl
Answer:
The percentage yield is 80.36% (see calculations in attachment).
Explanation:
The theoretical yield of the reaction is the amount of product that would result if all the limiting reagent reacted. The theoretical yield is calculated using the balanced equation.
In practice, the actual yield, or the amount of product actually obtained from a reaction, is almost always less than the theoretical yield.
To determine how efficient this reaction is, we need to calculate the percent yield, which describes the proportion of the actual yield to the theoretical yield. It is calculated as follows:
[tex] %yield = actual yield ÷ theoretical yield × 100% [/tex]
First we need to make sure that the equation is properly balanced. In the question they provide the balanced equation.
Since water is in excess, we calculate the theoretical yield using PCl₃.
Balance the following reaction. P4 + 3 O2 → 2P2O5
Answer:
the answer to fill the blank is 5
Explanation:
i just did the lesson :)
Answer:
5
Explanation:
Cunoscându-se că la 25C presiunea oxigenului dintr-un recipient este de 4 atmosfere, să se afle la ce temperatură oxigenul din recipient va avea presiunea de 8 atmosfere
Answer:
The container will have a pressure of 8 atm when the temperature is 50 degrees Celsius
Explanation:
To calculate this temperature, we need a gas law that relates temperature and pressure.
This is the Gay Lussac’s law and we know from it that temperature and pressure are directly related
Thus;
P1/T1 = P2/T2
From the question;
P1 = 4 atm
T1 = 25 degrees celsius
P2 = 8 atm
T2 = ?
Substituting these values, we have;
4/25 = 8/T2
4T2 = 8 * 25
4T2 = 200
T2 = 200/4
T2 = 50 degrees Celsius
A solution of ammonia has a ph of 11.8. What is the concentration of OH- ions in the solution?
Answer: The concentration of [tex]OH^-[/tex] ions in the solution is 0.0063 M
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pOH is calculated by taking negative logarithm of hydroxide ion concentration.
[tex]pOH=-\log [OH^-][/tex]
[tex]pH+pOH=14[/tex]
[tex]11.8+pOH=14[/tex]
[tex]pOH=2.2[/tex]
Putting in the values:
[tex]2.2=-\log[OH^-][/tex]
[tex][OH^-]=[/tex] 0.0063 M
Thus the concentration of [tex]OH^-[/tex] ions in the solution is 0.0063 M