Answer:
B. Precipitation
Explanation:
Precipitation is the scientific term for rain
6. A leprechaun requests 1 g of Rainbowium-214, which has a half-life of 20 minutes. How
many grams of Rainbowium-214 must be prepared if the shipping time is 1 hour?
Answer:
i am unsuree
Explanation:
Answer:
1 1/2 Grams
Explanation:
If one gram of Rainbowium-214 has a half-life of 20 minutes, it takes 40 minutes for all of the grams to disappear. 2 grams of Rainbowium-214 will take 1hr and 20 minutes, but we only need to keep 1g safe for 1hr. If we used 1 1/2 grams, it would last a full hour, making the correct answer option 1 1/2 grams.
what are three disadvantages of making and using plastic?
Which of the following bonds has the greatest polarity?
P4
Br-Br
Te-F
CI-F
Bond polarity and ionic character go hand in hand: We can say that polarity and ionic character are positively correlated. The classical way to determine either is to compare the electronegativity difference (ΔEN) between the bonding atoms. The greater the difference in electronegativity, the larger the dipole moment, the greater the polarity, and the greater the ionic character of the bond.
The Pauling electronegativity scale, which should be provided in most chemistry texts and is certainly available online, can be used to determine ΔEN. As a very general rule of thumb, an ΔEN that is equal to 2.0 or greater indicates an ionic bond. We don't have to worry about that here, though, since we're only interested in polarity. But this is just some conceptual relation to consider; indeed, ionic bonds can be seen as very polar covalent bonds (or covalent bonds with significant ionic character).
There is no known bond that has a 100% ionic character (ΔEN = 4), i.e., a purely ionic bond. But there are many bonds that we know of with 0% ionic character (ΔEN = 0), i.e., a completely nonpolar bond. We can think about this logically without even knowing specific electronegativity values: If the difference in electronegativity between two bonding atoms is 0, then the two atoms must have equivalent electronegativities. And when can this be the case? Well, atoms from the same element have the same electronegativity. So one case of completely nonpolar bonding would be covalent bonding between atoms of the same element.
In the question given, there are two such cases: P4 and Br-Br. P4 is a tetrahedral molecule composed of four covalently bonded P atoms, each one bearing a lone electron pair and bonded to the other three. With each P having the same electronegativity (ΔEN = 0), no P-P bond in P4 has a dipole moment, and the P4 molecule itself is nonpolar. Br-Br is how bromine is found naturally (as diatomic Br₂); since this is a covalent bond between the atoms of the same element, the ΔEN = 0 and there is no dipole moment. A bromine molecule is completely nonpolar.
Fluorine (F) has the greatest electronegativity among the elements, so whether the Te-F or the Cl-F bond has the greater polarity (i.e., the greater ΔEN) really depends on the electronegativity of Te and Cl.
But let's think about this first. Both Cl and F are halogens; Cl is in the period right below F, and, following periodic trends, Cl itself is quite electronegative. Generally, nonmetals don't form ionic bonds with each other (the underlying reason is complicated and not relevant here, but that notion agrees with ΔEN between any two nonmetals being less than 2.0). Nonmetallic elements can form very polar covalent bonds whose ΔEN is very close to 2.0, however.
Tellurium (Te) is a metalloid that is three periods below F. Electronegativity generally decreases as you go down a group. Even though Te and Cl are not in the same group, the fact that Te is two periods below should give a strong presumption that Te has a lower electronegativity than Cl. Moreover, electronegativity increases you move left to right on the periodic table (that is, as the group number increases); Te is in a group to the left of fluorine's and chlorine's. So, using periodic trends alone, we know that Te is in a group to the left of and below that of Cl, both of which trend toward decreasing electronegativity. Thus, it would be reasonable to assume that Te would have a smaller electronegativity than Cl. And so, the ΔEN of Te-F > ΔEN of Cl-F, which means the Te-F bond should have the greater polarity. And, indeed, this is true using the Pauling scale: The EN of F is 4.0; the EN of Cl is 3.0; and the EN of Te is 2.1.
In all, given that the ΔEN of P-P = 0; ΔEN of Br-Br = 0; ΔEN of Te-F = 1.9; and ΔEN of Cl-F = 1.0; the Te-F bond has the greatest polarity.
2. Which of these items would allow one scientist to reproduce the experiment of another scientist.
A.
B.
a strong hypothesis
a detailed scientific Journal
well-drawn graphs of the data
a complete list of all materials used
C.
D.
Answer:
answer us A I hope it helps u
copper(II) carbonate undergoes thermal decomposition. One of the pro
al decomposition is copper(II)oxide.
State the colour change of the solid seen during the reaction
start colour
end colour
Write a chemical equation for the thermal decomposition of copper(II) carbona
Answer: The green copper (II) carbonate [tex](CuCO_3)[/tex] changes to black copper oxide [tex](CuO)[/tex]
[tex]CuCO_3(s)\stackrel{\Delta }\rightarrow CaO(s)+CO_2(g)[/tex]
Explanation:
Decomposition is defined as the chemical reaction in which a single compound gives two or more simple substances. It requires energy to break the bonds between reactants, thus is an endothermic process.
Thermal decomposition uses heat for decomposition.
The chemical equation for thermal decomposition of copper (II) carbonate is:
[tex]CuCO_3(s)\stackrel{\Delta }\rightarrow CaO(s)+CO_2(g)[/tex]
The green copper (II) carbonate [tex](CuCO_3)[/tex] changes to black copper oxide [tex](CuO)[/tex]
Which of the following statements is
incorrect about heat and
temperature?
Which occurs when a warm fluid cools down?
A) Energy is released into the environment
B) Energy is absorbed from the environment
C) The density of the fluid decreases
D) The mass of the fluid decreases
THE CORRECT ANSWER IS A!
#edge2021 unit review 100%
Answer:
option A is correct answer of this question
hope it helps and your day will be full of happiness
The answer is A ¬ω¬
hope it helps and have good day (yes it's late and yes i do not care I'm doing it for points ×°×)
78.0 g of H2O will react with Fe to produce _______ formula units of FeO2
Please help
Answer:
1.306 × 10^24 formula units.
Explanation:
The chemical equation of this qkrstios as follows:
Fe + 2H2O → FeO2 + 2H2
Based on the reaction, 2 mole of H2O produces 1 mole of FeO2
Using the formula as follows;
Mole = mass/molar mass
Molar mass of H2O = 1(2) + 16 = 18g/mol
mole = 78/18
mole = 4.33moles
If 2 mole of H2O reacts to produce 1 mole of FeO2
4.33 moles of H2O will produce 4.33/2 = 2.17moles of FeO2.
To convert moles to formula units, we multiply number of moles by Avagadro number (6.02 × 10^23 units)
= 2.17 moles × 6.02 × 10^23 units
= 13.06 × 10^23
= 1.306 × 10^24 formula units.
Explain why carbon dioxide is a gas, water
is a liquid, and salt is solid at room temperature based on how the particles
are held together.
Answer:
Carbon dioxide is a gas because the particles surrounding it are more spread out and free from each other. Water is a liquid because the particles are partially spread out and have a medium space to move around. And due to the room temperature, salt's particles can either be hot and move rapidly, or be cold and not move rapidly.
Explanation:
Which of the statements below are TRUE, knowing what we know about forces and motion?
Choose ANY that are TRUE.
A. Objects at rest need a force to keep them at rest.
B. A net force causes objects to accelerate.
C. If forces acting on an object are balanced, the object can change its velocity.
D.Inertia means that an object will keep its same state of motion.
Mass and weight are the same thing and are both forces.
Answer:
b
Explanation:
if there is a net force acting on an object, the object will have an acceleration and the objects velocity will change
this is when an organism like insects or plants become trapped in amber
thats very nice lol, things stuck in amber are very cool
What contribution did Niels Bohr make to atomic theory?
O A. He made a model of the atom called the plum-pudding model.
B. He performed an experiment that determined the charge of the
electron.
C. He made a model of the atom, with electrons circling the nucleus.
D. He discovered that the photoelectric effect was caused by light
shining on metal.
Answer:
C
Explanation
His greatest contribution is the atomic model
Many people wear reading glasses, which allow for better near vision.
What type of lenses are on these glasses?
Answer:
Convex
Explanation:
8 guess not sure cause light rays should be converging to meet to their eye
How many grams of oxygen are required to react with 2.05 g
g
of dihydrogen sulfide?
Answer:
38 g
Explanation:
I think thats the answer in your question
Which of the following is an indication of a chemical reaction?
freezing
melting
release of heat
all of the above
Answer:
C
Explanation:
A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.
CHEMISTRY HELP PLEASE
how do you determine what unit to put k in (rate law)?
I think the first option
Explanation:
Sorry If I was wrong.
The upper part of the mantle is
Hard
OR
Soft
Answer: Hard
Explanation:
The upper part of the mantle is hard as it contains thick rock layers. The mantle's upper layer and the crust make up a brittle and rigid rock that's referred to as the Lithosphere.
The upper mantle starts below the Earth crust and then stops at the start of the lower mantle. We should note that the upper mantle results in the movement of the tectonic plates.
Enter your answer in the provided box.
A gas initially at 5.48 L, 1.34 atm, and 61 °C undergoes a change so that its final volume and temperature are 1.32 L and 31 °C. What is its final pressure? Assume the number of moles remains unchanged.
atm
Answer:
5.06atm
Explanation:
Using the combined gas law equation;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (Litres)
V2 = final volume (Litres)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
P1 = 1.34 atm
P2 = ?
V1 = 5.48 L
V2 = 1.32 L
T1 = 61 °C = 61 + 273 = 334K
T2 = 31 °C = 31 + 273 = 304K
Using P1V1/T1 = P2V2/T2
1.34 × 5.48/334 = P2 × 1.32/304
7.34/334 = 1.32P2/304
Cross multiply
334 × 1.32P2 = 304 × 7.34
440.88P2 = 2231.36
P2 = 2231.36/440.88
P2 = 5.06
The final pressure is 5.06atm
The molar mass for this compound is 102.1 g/mol.
The molecular formula for this compound is
What is the meaning of reference point?
Answer:
Reference point, or frame of reference, a system of geometric axes in relation to which measurements of size, position, or motion can be made. Reference point, a geometrical point used to define the location of another point
Explanation:
Why is thermal energy from the sun transferred to Earth through electromagnetic waves, instead of any other type of thermal energy transfer?
A) Electromagnetic waves can carry energy through water
B) Electromagnetic waves can travel through empty space.
C) Electromagnetic waves can move through gases faster than other types of energy transfer.
D) Electromagnetic waves can move more energy than any other type of energy transfer.
THE CORRECT ANSWER IS B.
#edge2021
Answer: B) Electromagnetic waves can travel through empty space.
Explanation:
Conduction: This type of heat transfer happens when there is direct contact between the two object. Example: heating a pan on stove.
Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) due to the movement of hot layers to the top and cold layers to the bottom which leads to convection currents. Example: Heating of swimming pool.
Radiation: This type of heat transfer happens when there is direct transfer of energy through empty space.The electromagnetic radiation from the surface of an object which is due to the object's temperature is radiation. Example: Heating of earth's surface.
Which of the following is transferred when a primary consumer in a food web eats a primary producer?
A. energy and matter
B. energy, but not matter
C. solar energy, but not chemical energy
D. solar energy and chemical energy
Answer:
B. energy, but not matter
Calculate the amount in grams in 0.52600 moles of vanadium.
Answer:
26.795229
Explanation:
This is how much it is
What is the best way to ask out a girl you really like but your afraid to ask her out
Answer:
I would say try hinting it to her, not in an obvious way but kind of flirt. Make sure to be yourself!
In which numbered position would a Period 4 element that is a metal with three valence electrons be located?
A) Position 13
B) Position 15
C) Position 20
D) Position 31
The position where a Period 4 element that is also a metal with three valence electrons would be located is: B) Position 15.
What is a periodic table?A periodic table can be defined as an organized tabular array of all the chemical elements, which is typically arranged in order of increasing atomic number or number of protons (in rows).
In Chemistry, a periodic table comprises seven (7) rows and eighteen (18) columns. Also, all chemical elements are arranged (grouped) on the periodic table based on their atomic number (number of protons).
In this context, the position where a Period 4 element that is also a metal with three valence electrons would be located is Position 15 on the periodic table.
Read more on periodic table here: https://brainly.com/question/18384230
Calculate the mass of butane needed to produce 58.8 g of carbon dioxide.
Answer:
19.37g
Explanation:
1 mole CH4 gives 4 mole CO2
so 58 g gives 176 g CO2
(58/176)×58.8 g CH4 gives 58.8 g CO2
Is this the right answer lmk anyone? Please if you know!
Answer:
prototype
Explanation:
don't go right to designing the original thing
(P) has two isotopes : P -31 and P - 32 . Let's say that the percent abundance of P - 31 is 75\% and for P-32 it is 25 %. What is the average atomic mass of phosphorus?
Answer: 2.3% :)
............................
Answer: 34%
Explanation:
Please answer fast thank you!!!
Answer:
okokokokomokokok
Explanation:
njiuuhhhjkjnn
How many moles would be present in 300 liters of dinitrogen monoxide at
STP?
Answer: 13.4
Explanation: i guessed it and got it correct on ck-12
STP is the standard pressure and temperature condition of the ideal gas. 0.13 moles of dinitrogen monoxide will be present at STP.
What is the ideal gas equation?An ideal gas equation is a relation between the pressure, volume with moles, gas constant, and the temperature of the ideal gas. The ideal gas equation is given by,
[tex]\rm PV = nRT[/tex]
Given at STP,
Pressure = 1 atm
Volume = 300 L
Moles = ?
Gas constant =8.3144598 J per mol per Kelvin
Temperature = 273 K
Substituting values in the ideal gas equation we get:
[tex]\begin{aligned} \rm n &= \rm \dfrac{ PV}{RT}\\\\&= \dfrac{1 \times 300}{273 \times 8.314}\\\\&=0.1321\end{aligned}[/tex]
Therefore, 0.13 moles of dinitrogen monoxide are produced at STP.
Learn more about STP here:
https://brainly.com/question/15828565