Answer : The correct option is, (B) bonding and unshared pairs around central atom.
Explanation :
Lewis-dot structure : It shows the bonding between the atoms of a molecule.
When we are determining the shape of a molecule then it is important to draw a Lewis-dot structure and for drawing a Lewis-dot structure we should know that how many total number of valance electrons present in a given compound or a molecule.
For example:
The given molecule is, [tex]H_2CO_3[/tex]
As we know that hydrogen has '1' valence electrons, carbon has '4' valance electrons and oxygen has '6' valence electron.
Therefore, the total number of valence electrons in [tex]H_2CO_3[/tex] = 2 + 4 + 18 = 24
Now we have to determine the hybridization of carbon in [tex]H_2CO_3[/tex]
Number of bond pairs = 3
Number of lone pairs = 0
Number of atomic orbitals around carbon atom = 3 + 0 = 3
So, hybridization will be [tex]sp^2[/tex] and the shape is, trigonal planar.
Hence, it is important to draw a Lewis Dot structure first in order to see the total number of bonding and unshared pairs around central atom.
What is the molar mass of Na2SO4?
Answer:
142 g / mol
Explanation:
Molar mass of Na=23
S=32
O=16
Total Molar mass: 23*2+32+16*4
=142g / mol
A student completes a titration by adding 12.0 milliliters of NaOH(aq) of unknown concentration to 16.0 milliliters of 0.15 M HCl(aq). What is the molar concentration of the NaOH(aq)?
1)5.0 M
2)0.20 M
3)0.11 M
4)1.1 M
12×C(NaOH)=16×0.15
C(NaOH)=(16×0.15)÷12=0.2
Answer: 2) 0.20M
Is the concentration of 25 cm3 solution same as 250 cm3 solution?
Answer:
it can be
Explanation:
because the concentration of a solution will not affect the volume of it
A person is standing on the steps at the shallow end of the pool. What wave property explains why his/her feet appear closer to the surface then they really are? reflection interference diffraction refraction
Answer:
Diffraction
Explanation:
When light enters water at an angle, it is bent downward by diffraction. However, our brain sees the underwater image as if it were on a straight line.
Thus, the bottom of the pool appears to be shallower than it actually is.
A is wrong. If all the light were reflected from the surface, we wouldn't be able to see the person's feet.
B is wrong. if all the light rays interfered with each other, we wouldn't be able to see anything.
D is wrong. Refraction is the bending of light as it passes the edge of an object.
Answer:
refraction
Explanation:
5. How can you decrease the pressure of a gas in a container without changing the volume of the gas?
Answer:
By increaing the size of container
Explanation:
Gay-Lussac Law:
This law states that pressure of the gas is directly proportional to the temperature of the gas at constant volume.
Mathematically,
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex] (at constant volume )
where,
[tex]P_1\text{ and }T_1[/tex] are the initial pressure and temperature of the gas.
[tex]P_2\text{ and }T_2[/tex] are the final pressure and temperature of the gas.
So in order to decrease the pressure of the gas in container decrease the temperature of the gas present in the container due to which pressure of the gas will also get decrease as per as Gay-Lussac law.
Which of the following describes a compound? (Hint: Carbon and oxygen bo
A.
a piece of pure carbon, containing only carbon atoms
B.
oxygen gas surrounding a solid piece of carbon
c.
a substance made of two oxygen atoms for each carbon atom
carbon and oxygen atoms mixed without being bonded together
A compound is a substance formed when two or more different elements bond together chemically. In the options provided, 'a substance made of two oxygen atoms for each carbon atom' describes a compound, specifically carbon dioxide (CO2).
Explanation:In chemistry, a compound is a substance formed when two or more different elements are bonded together. For the options provided in your question, the choice 'a substance made of two oxygen atoms for each carbon atom' most accurately describes a compound. This describes the compound carbon dioxide (CO2), where each molecule includes one carbon atom bonded to two oxygen atoms. Remember, a substance that consists of two or more elements that are chemically combined is regarded as a compound.
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3. Describe a possible danger that can occur if you put food, soda, coffee, pencil erasers, etc. in your mouth while conducting your chemistry experiments.
Answer:
It is possible for the object/food to have been infected/contaminated
Explanation:
If you where to be eating while doing chemistry, it is possible that some of the things you are experimenting with might have gotten on some of the things around, or come off your hands onto the thing.
Answer:
While performing chemistry experiments one should not eat food while performing the experiments as harmful chemicals can be ingested into mouth along with the food.
There are various types of chemical and substances present in lab which might be harmful for person performing experiment.
One can also get disturbed and might spill chemicals on himself which can be harmful.
Which contains more soda a 2 liter bottle or a 2 quart bottle
Answer:
the 2 liter contains more soda
8. How much enthalpy/heat is transferred when 0.5113
gof ammonia (NH3) reacts with excess oxygen according
| to the following equation:
4NH3 +502 - 4N0+ 6H20
AH = -905.4J
When 0.5113 g of ammonia react with excess oxygen, -6.795 J of heat are released.
What is enthalpy?Enthalpy, a property of a thermodynamic system, is the sum of the system's internal energy and the product of its pressure and volume.
Step 1. Write the thermochemical equation.4 NH₃(g) +5 O₂(g) ⇒ 4 NO(g) + 6 H₂O ΔH = -905.4J
Step 2. Convert 0.5113 g of NH₃ to moles.The molar mass of NH₃ is 17.03 g/mol.
0.5113 g × 1 mol/17.03 g = 0.03002 mol
Step 3. Calculate the heat released by the reaction of 0.03002 moles of NH₃.According to the thermochemical equation, -905.4 J are released upon the reaction of 4 moles of ammonia.
0.03002 mol × (-905.4 J/4 mol) = -6.795 J
When 0.5113 g of ammonia react with excess oxygen, -6.795 J of heat are released.
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How much heat is released when 15.0 g of water vapor is condensed and then cooled from 100.0 C to -32.0 C?
Show work please ❤️
Answer:
46.85kJ
Explanation:
The specific latent heat of vaporization of water is =2.3 x 10⁶ J kg-1.
The specific heat capacity of water = 4.2×10³J/kgK
The latent heat of fusion of water= 3.36×10⁵ J/kg
The specific heat capacity of ice=2.108×10³ J/kgK
The heat of lost due to cooling of ice is calculated as follows by adding the heat lost during condensation of water vapor to the heat lost during cooling the water to freezing point plus the heat lost during freezing plus the heat lost during cooling the ice to -32.0°C
=MLv+MCΔT(water)+MLf+MCΔT(ice) where Lv=latent heat of vaporization of water , and Lf is the latent heat of fusion ice.
=(0.015kg×2.3 x 10⁶ J/kg)+(0.015kg×4.2×10³J/kgK×100K)+(0.015kg×3.36×10⁵ J/kg)+(0.015kg× 2.108×10³ J/kgK)×32K
=34500J+6300J+5040J+1011.84J
=46851.84J
=46.85kJ
What happens in a reaction if it is at chemical equilibrium?
a.there are no reactants in the system.
b. all of the products are used up.
c. the amount of the reactant is constantly decreasing.
d. the rate of the forward reaction equals the rate of the reverse reaction.
Answer: The answer is D
Explanation:
In a chemical equilibrium, the forward and reverse reactions occur at equal rates, and the concentrations of products and reactants remain constant. A catalyst speeds up the rate of a chemical reaction, but has no effect upon the equilibrium position for that reaction.
In a chemical reaction at equilibrium, the rate of the forward reaction equals the rate of the reverse reaction. This results in constant concentrations of the reactants and products, even though individual molecules continue to react.
Explanation:The question is dealing with the concept of chemical equilibrium in chemistry. First, let's understand that this condition refers to a state where the concentrations of the reactants and products remain constant over time. Specifically, the correct option is 'd'. the rate of the forward reaction equals the rate of the reverse reaction'. This means that for a reaction at equilibrium, while there may still be reactants and products present, and reactions are still happening, they are occurring at the same rate in both directions. Therefore, there is no net change in the concentrations of the reactants or products, even though individual molecules are continually reacting. This does not mean that there are no reactants left in the system (a), all the products are getting used up (b), or that the amount of the reactant is constantly decreasing (c). It strictly implies that the forward and reverse reactions have the same rate.
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How does large change in temperature or pH affect proteins?
(a) They eliminate all of their essential amino acids
(b) They lose their acid sequence
(c) They come apart or lose their shape
(d) They change their amino acids into fatty acids
Answer:
(c) They come apart or lose their shape
Explanation:
Heat and temperature disrupt the attractions of the groups in the side chains that give the protein its characteristic shape.
(a) and (b) are wrong. The proteins do not lose their amino acids or their sequence.
(d) is wrong. The amino acids do not change into fatty acids.
2Cu(NO3)2=2CuO+4NO2+O2
What would you observe when copper(II) nitrate is heated?
Upon heating copper(II) nitrate, black-colored copper(II) oxide forms as a solid residue; brown fumes of nitrogen dioxide are released, and oxygen gas is also evolved.
When copper(II) nitrate is heated, you would observe the compound decomposing into copper(II) oxide (CuO), nitrogen dioxide (NO₂), and oxygen (O₂). Copper(II) oxide is a solid with a black color and would be visible as a residue. Nitrogen dioxide is a gas with a characteristic brown color, which would be noticeable as brown fumes evolving from the reaction mixture.
Additionally, you might see the release of oxygen gas, though it is colorless and would not be visibly noticeable without testing for its presence (such as by introducing a glowing splint, which would re-ignite in the presence of oxygen).
A distance of 2 kilometers is equal
Answer:
1.24274 miles; 3.2186818249471 kilometer; 3218.6818249471002673 meters; 321868.18249471002491 centimeters; 3218681.8249471001327 millimeters; 3218681824.9471006393 micrometers; 3218681824947.1000977 nanometers; 2.18722240048120917 yards; 6.56166720144 feet; 7.87400064173235 inches; 1.079911535 nautical mile.
Answer:
2000 meters
Explanation:
because 2 kilometers equals 2000 meters
What is the compound name for the formula [Ru(en)2Cl2]2+ and [Co(en)Cl2Br]-
Answer:2C12
Explanation:because if u divide the the equation by 2 u well get the same answer you can multiply but that will take longer with the invisible zeros and stuff like that but the answer is 2c12 and on the real FSA u can pull out ur phone and cheat just make sure the teacher is not watching just playing with you DONT DO THAT YOU WILL GET IN SERIOUS TROBLE KIDS DO NOT DO THIS KN THE REAL DAY OF THE FSA PLEASE DONT DO IT YOU WILL GET IN SERIOUS TROUBLE WELL THATS IT FOR TODAY SO HAVE A GREAT DAY THIS IS TO PUT PRESSURE ON YOU
An industrial chemist is studying a sample of an
unknown metal. Describe two ways he could
change the metal physically and two ways he could change the metal chemically to try to identify
ANSWER!!!
Heat the metal until it melts (physical change).
Attempt to react the metal with oxygen (chemical change).
Stretch the metal into a wire (physical change).
Attempt to react the metal with acid (chemical change).
Answer:
the above
Explanation:
heat the metal until it melts
react it with o2
stretch it
react it with acid
Answer:alloy
Explanation:
He can use alloy to change the metal.An alloy is the mixture of two or more metal.
Given [H3O+] = 1.00 x 10-7M
Is this acidic, basic or neutral?
How do you know?
Answer:
This solution is neutral.
Assumption: the solution is under room temperature, such that [tex]K_w = 10^{-14}[/tex].
Explanation:
For a solution in water,
[tex]\mathrm{[H_3O^{+}] \cdot [OH^{-}]} = \mathnormal{K_w}[/tex].
In other words, if [tex]K_w[/tex] is given, knowing the concentration (in [tex]\rm M[/tex], or equivalently [tex]\rm mol\cdot L^{-1}[/tex]) of either [tex]\rm H_3O^{+}[/tex] or [tex]\rm OH^{-}[/tex] will imply the concentration of the other ion.
Under room temperature,
[tex]K_w \approx 10^{-14}[/tex].
The question states that for this solution,
[tex]\mathrm{[H_3O^{+}]} = \rm 1.00\times 10^{-7}\; M[/tex]
As a result, the concentration of [tex]\rm OH^{-}[/tex] in this solution will be
[tex]\displaystyle \frac{K_w}{\mathrm{[H_3O^{+}]}} = \frac{10^{-14}}{1.00\times 10^{-7}} = 10^{-7}[/tex].
A solution is acidic if [tex]\mathrm{[H_3O^{+}] > [OH^{-}]}[/tex].A solution is basic if [tex]\mathrm{[H_3O^{+}] < [OH^{-}]}[/tex].A solution is neutral if [tex]\mathrm{[H_3O^{+}] = [OH^{-}]}[/tex].In this case, [tex]\rm [H_3O^{+}] = 10^{-7}\; M = [OH^{-}][/tex]. In other words, this solution is neutral.
how much energy is required to vaporize 2 kg of copper?
A 4730 kj
B 207kj
C 9460 kj
D 414kj
The Answer is 9460 kJ (C)
The other answer is cap
Which of the following will cause an increase in the acceleration of an object? increase force decrease force increase mass decrease mass
Answer:
Mass and distance affect the gravitational attraction between objects.
Explanation:
Answer:
Its Mass
Explanation:
You have a 15.0 gram sample of gold at 20.0°C. How much heat does it take to raise the temperature to 100.0°C?
Answer:
=154.8 J
Explanation:
The rise in temperature is contributed by the change in temperature.
Change in enthalpy = MC∅, where M is the mass of the substance, C is the specific heat capacity and ∅ is the change in temperature.
Change in temperature = 100.0°C-20.0°C=80°C
ΔH=MC∅
The specific heat capacity of gold= 0.129 J/g°C
ΔH= 15.0g×0.129J/g°C×80°C
=154.8 J
In a reaction equation, where are the products located?
A.) above the arrow
B.) to the right of the arrow
C.) to the left of the arrow
D.) below the arrow
This is how a reaction equation is set up:
Reactants ------> Products
This means that the answer is B) Products are located to the right of the arrow (aka the yield)
Hope this helped!
~Just a girl in love with Shawn Mendes
Identify the Lewis acid in this balanced equation:
Ag+ + 2NH3 -> Ag(NH3)2+
A. Ag+
B. NH3
C. Ag(NH3)2+
Lewis acid is a chemical species that is able to accept an electron pair. In this case the silver ion Ag[tex]^{+}[/tex] is a lewis acid because it accepts a lone pair electrons form the ammonia :NH[tex]_{3}[/tex]
Answer:
Your answer is Ag+ have a good day
Explanation:
A gas has an empirical formula CH4. 0.16g of the gas occupies a volume of 240cm^3 What is the molecular formula of the gas???.
Help me anyone who know!!!
Explanation and answer:
The molar volume of a gas is 22.4 L at 0 deg. C.
So the molar mass of the gas is, by proportion,
0.16 g * (22400 mL)/(240 mL) = 14.93 g
The molar mass of (CH4)n = 12+4(1) = 16.
So n = 15.93/16 = 1, or the molecular formula is CH4.
Note: The temperature at which the volume was observed was not given. If 240 cm^3 was observed at 20 deg.C, then the volume at 0 deg.C would be
V=240*(273+0)/(273+20) = 223.6
The molar mass = 0.16*22400/(223.6) = 16.03
which gives n = 16/16.03 = 1 again, but more accurately.
An electron has _____.
far less mass than either a proton or a neutron
more mass than a proton or a neutron
no mass at all
about the same mass as a proton or a neutron
Answer:
Your answer is A. far less mass than either a proton or a neutron
I am 10000% sure this is correct
hope this helps ya
:D plz mark me brainiest
Answer:
the answer is a
why does stirring increase the speed of a solute dissolving in water
Answer:
When you stir a solute, more surface area of the substance is exposed to the solvent.
Explanation:
The higher the surface area in relation to volume is, the faster a solute will dissolve.
Hope it helps
Answer:
Try it and see. My guess is that stirring would increase the rate of dissolution.
Explanation:
So get 2 beakers, fil them up with 10 g salt, and add 100 mL water. Put a magnetic follower in one of the beakers, place it on a stirrer and let it rip. Measure the time, and see if the unstirred beaker still has solute on the bottom.
When can a hypothesis be elevated to the status of a theory?
a) when it is validated by an experiment
b) when data gathered from an experiment precisely fits predictions
c) when it can be proved to be true
d) when it meets the test of repeated experimentation
Answer:
d) when it meets the test of repeated expected experimentation.
Explanation:
A hypothesis is a guess based on observation in the the behavior of nature. This guess is used to formulate the relevant experiments and when the experimental results consistently meet the expected outcomes then the hypothesis graduates into a theory. Theories form the basis of many fields in science as they try to explain the behavior of nature.
Answer:
d) when it meets the test of repeated expected experimentation.
Explanation:
hope this helps
Determine the empirical formula for succinic acid that is composed of 40.60% carbon, 5.18% hydrogen, and 54.22% oxygen.
Answer:
C₂H₂O₃
Explanation:
The empirical formula of a compound is derived bu finding the whole ratios of the constituent elements.
In succinic acid, the ratios of carbon to hydrogen to oxygen is calculated as follows:
% mass
Carbon- 40.60
Hydrogen - 5.18
Oxygen - 54.22
RAM
Carbon -12
Oxygen - 15.994
Hydrogen -1.008
No of moles elements in the compound
Carbon = 40.60/12=3.3833
Oxygen = 54.22/15.994= 3.39
Hydrogen= 5.18/1.008 = 5.1389
Mole ratios of the individual elements we divide by the smallest value of the number of moles.
Carbon: Hydrogen : Oxygen
3.3833/3.3833:3.39/3.3833:5.1389/3.3833
=1:1:1.5
We can multiply the value by 2 to get the whole number ratio.
=2:2:3
The empirical formula will be:
C₂H₂O₃
part of molten rock at mid-ocean ridges
Answer:
Magma
Explanation:
Magma is part of molten rock at mid-ocean ridges.
Hope this helps!
what is the binding energy of a nucleus that has a mass defect of 5.81*10-^29 kg
A 5.23*10-^12 J
B 3.15* 10^12 J
C 1.57*10-3 J
D 9.44*10^20 J
Answer:
Choice A: Approximately [tex]5.23 \times 10^{-29}[/tex] joules.
Explanation:
Apply the famous mass-energy equivalence equation to find the energy that correspond to the [tex]\rm 5.81\times 10^{-29}[/tex] kilograms of mass.
[tex]E = m \cdot c^{2}[/tex],
where
[tex]E[/tex] stands for energy, [tex]m[/tex] stands for mass, and[tex]c[/tex] is the speed of light in vacuum.The speed of light in vacuum is a constant. However, finding the right units for this value can simplify the calculations a lot. What should be the unit of [tex]c[/tex]?
The mass given is in the appropriate SI unit:
Mass is in kilograms.
Thus, proceed with the speed of light in SI units. The SI unit for speed is meters per second. For the speed of light, [tex]c \approx \rm 3.00\times 10^{8}\;m\cdot s^{-1}[/tex].
Apply the mass-energy equivalence:
[tex]\begin{aligned} E &= m \cdot c^{2} \\ &= \rm 5.81\times 10^{-29}\; kg \times {\left(3.00\times 10^{8}\; m\cdot s^{-1}\right)}^{2}\\ &\approx \rm 5.23\times 10^{-12}\;kg\cdot m^{2}\cdot s^{-2} \end{aligned}[/tex].
The unit of energy is not in joules. Don't be alerted. Consider the definition of a joule of energy. One joule is the work done on an object when a force of one newton acts on the object in the direction of the force through the distance of one meter. (English Wikipedia.)
[tex]\rm 1\; J = 1\; N \times 1\; m[/tex].
However, a force of one newton is defined as the force required to accelerated an object with a mass of one kilogram (not gram) at a rate of one meter per second squared. (English Wikipedia.)
[tex]\begin{aligned}\rm 1\; J &= \rm 1\; N \times 1\; m\\ & = \rm \left(1\; kg\times 1\; m\cdot s^{-2}\right)\times 1\; m\\ &= \rm 1\; kg \cdot m^{2}\cdot s^{-2}\end{aligned}[/tex].
In other words, the mass defect here is also [tex]\rm 5.23\times 10^{-12}\; J[/tex].
Answer: 5.23*10^-12 j
Explanation:
How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 Fe (s) + 3 O2 (g) 2 Fe2O3 (s)
Answer:
Depending on the definition of "standard" conditions, the volume of O₂ required here will be either
43.1 L if the STP volume is 22.4 L/mol, or43.7 L if the STP volume is 22.7 L/mol.Explanation:
Relative atomic mass data from a modern periodic table:
Fe: 55.845.How many moles of iron Fe in that 35.8 gram of iron metal?
[tex]M(\mathrm{Fe}) = \rm 55.845\; g\cdot mol^{-1}[/tex].
[tex]\displaystyle n = \frac{m}{M} = \rm \frac{35.8\; g}{55.845\; g\cdot mol^{-1}} = 0.641060\; mol[/tex].
How many moles of oxygen gas will be required?
Consider the ratio between the coefficient of Fe and that of [tex]\mathrm{O_2}[/tex] in the equation:
[tex]\displaystyle \frac{n(\mathrm{O_2})}{n(\mathrm{Fe})} = \frac{3}{1} = 3[/tex].
As a result,
[tex]\displaystyle n(\mathrm{O_2}) = n(\mathrm{Fe}) \cdot \frac{n(\mathrm{O_2})}{n(\mathrm{Fe})} = \rm 0.641060\; mol \times 3 = 1.92318\; mol[/tex].
What's the volume of that [tex]\rm 1.92318\; mol[/tex] of oxygen gas under STP?
One mole of an ideal gas occupies a volume 22.4 Liters under STP (or 22.7 liters in certain textbooks.) The volume of an ideal gas is directly related to the number of moles of particles in this gas. Assume that oxygen acts like an ideal gas under STP. As a result, 1.92318 moles of oxygen will occupy a volume of either
[tex]\rm 1.92318\; mol \times 22.4\; L\cdot mol^{-1} = 43.1\; L[/tex] or
[tex]\rm 1.92318\; mol \times 22.7\; L\cdot mol^{-1} = 43.7\; L[/tex].