Answer: CS and F
Explanation:
...ck-12
The pair of elements that would most likely undergo a violent reaction if combined with each other is; Choice D: Cs and F
According to the question;
We are required to determine the pair of elements would most likely undergo a violent reaction if combined with each other.Conventionally, alkali metals and halogens react violently.
More specifically; Caesium and Flourine react most violently because they are highly reactive members of the Alkali metals and halogens group respectively.
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The structures of TeF4 and TeCl4 in the gas phase have been studied by electron diffraction (S. A. Shlykov, N. I. Giricheva, A. V. Titov, M. Szwak, D. Lentz, G. V. Girichev, Dalton Trans., 2010, 39, 3245).
a. Would you expect the Te i X (axial) distances in these molecules to be longer or shorter than than Te i X (equatorial) distances? Explain briefly.
b. Which compound would you predict to have the smaller X(axial) i Te i X(axial) angles? The smaller X(equatorial) i Te i X(equatorial) angles? Explain briefly.
Answer:
See explanation
Explanation:
Two structures are pictured in the image attached, structure 2 is a more stable structure for TeF₄ or TeCl₄ since the lone pair in the structure is present at an equatorial position. Note that the structure of the compound is based on a trigonal bipyramid but of the structure type AX4E, where the lone pair could be positioned at axial or equatorial positions as shown in the images attached.
As a result of repulsion between electron pairs, the bond distance between Te - X(axial) is greater than Te-X (equatorial). This implies that the Te - X(axial) bonds are longer than Te - X(equatorial) bonds.
In answering the question, we must take cognisance of the fact fluorine is more electronegative than chlorine. This implies that fluorine will draw more electron density towards itself than chlorine and this shortens the bond length.
The structures of the both compounds are based on a trigonal bipyramid with a bond angle of 90° for axial position and 120° for the equatorial position.
Owing to the greater electo negativity of fluorine, both the fluorine F-axial and F-equatorial bonds of TeF4 are shorter than the Cl-axial and Cl-equatorial bonds of TeCl4. Hence the axial and equatorial angles in TeF4 are smaller than the axial and equatorial bond angles in TeCl4 due to the greater electro negativity of the fluorine atom.
What is the enthalpy change for the reaction
Use the trends in ionization energy and electron affinity to explain why sodium bromide has the formula NaBr and not Na2Br or NaBr2. Which one of the following is the correct statement?
a) All metals form 1+ ions and sodium is a metal.
b) Sodium only has one electron, so it has only one to lose.
c) Sodium has only one valence electron which can be lost relatively easily; removing a second electron would be more difficult because it would have to be a core electron.
You discover some bones that have roughly %s as much carbon-14 in them as
they initially possessed. How long ago did the animal live?
Answer:
150 years i guess so? im nkt sure
Answer:
If a fossil bone is found to contain 1/8th as much Carbon-14 as the bone of a living animal, what is the approximate age of the fossil?(half-life of C-14 = 5800 years)
Explanation:
What kind of technology helps us locate likely places to find fossils?
Answer:
Artificial Intelligence has helped us find fossils faster than ever. Before this technology, finding fossils was based on luck although scientists could make an educated guess. These robots are called paleobots. These robots use various techniques like scanning the location and some robots can also help with excavation.
Answer:
NASA technology, Remote Sensing, the search can be narrowed. Remote sensing techniques use satellites to help observe and measure objects from a distance. One part of remote sensing involves taking pictures. With images like the ones from NASA's LandSat Satellites, paleontologists use remote sensing to locate areas in the Gobi where fossils are most likely to be found. LandSat sensors measure different wavelengths of reflected sunlight and emitted thermal radiation. The data are beamed back to Earth, where they can be made into images. Paleontologists analyze these images, looking for rock formations most likely to yield fossils.
Explanation:
Gaseous hydrogen and oxygen can be prepared in the laboratory from the decomposition of gaseous water.
The equation for the reaction is
2H2O(g)⟶2H2(g)+O2(g)
Calculate how many grams of O2(g) can be produced from 58.9 g H2O(g).
Answer:
Mass of oxygen = 52.32 g
Explanation:
Given data:
Mass of water = 58.9 g
Mass of oxygen produced = ?
Solution:
Chemical equation:
2H₂O → 2H₂ + O₂
Number of moles of water:
Number of moles = mass/ molar mass
Number of moles = 58.9 g/ 18 g/mol
Number of moles = 3.27 mol
Now we will compare the moles of water with oxygen from balance chemical equation.
H₂O : O₂
2 : 1
3.27 : 1/2×3.27 = 1.635 mol
Mass of oxygen produced:
Mass = number of moles × molar mass
Mass = 1.635 mol × 32 g/mol
Mass = 52.32 g
The ability of a substance to dissolve in another is called
Answer: Solubility
Explanation:
Answer:
Solubility i believe
Explanation:
is coffee and water a heterogeneous?
Answer:
It is homogeneous
Explanation:
A 2.50M solution of NaOH is diluted from a volume of 0.890L to a volume of 2.00L, What is the new molarity?
O 2.78011
O 1.11M
O 5.62M
O 4.5M
Answer:
1.11 M
Explanation:
M₁V₁ = M₂V₂
Step 1: Define
Molarity₁ = 2.50 M
Volume₁ = 0.890 L
Molarity₂ = unknown
Volume₂ = 2.00 L
Step 2: Substitute and Evaluate for M₂
(2.50 M)(0.890 L) = (M₂)(2.00 L)
2.225 = M₂(2.00 L)
M₂ = 1.1125 M
Step 3: Simplify
We are given 3 sig figs.
1.1125 M ≈ 1.11 M
Is oxidation an example of an extensive property or an intensive property? Explain.
write the balanced redox reaction equation?
Answer:
see the image below
Explanation:
oxidation is losing of electrons
reduction is gaining of electrons
to an atom.
Neutrons add only
a. mass
b.ions
C. positive charge
d. negative charge
Please select the best answer from the choices provided
A
В
С
D
Pls help fast due in 10 mins!!! :(((((((( ughhh please!
Answer:
The answer is A, Neutron adds only mass
One _____ is the amount of energy needed to apply a force of 1 Newton over a distance of 1 meter. (Spell out your answer.)
The answer is joule
The Lewis structure of an oxygen atom should have _____________ dots drawn around the symbol .The Lewis structure of a calcium atom should have ____________ dots drawn around the symbol Ca. The Lewis structure of a nitrogen atom should have ___________ dots drawn around the symbol N. The Lewis structure of an aluminum atom should have ___________ dots drawn around the symbol Al. The Lewis structure of a fluorine atom should have _________ dots drawn around the symbol F.
Answer:
Oxygen- 6
Calcium-2
Nitrogen-5
Aluminum-3
Flourine-7
Explanation:
A Lewis structure or dot electron structure is a representation of an atom in which the valence electrons on the outermost shell of the atom are represented as dots.
These dots show the number of valence electrons as well as the group to which the atom belongs in the periodic table.
The Lewis structure of an oxygen atom should have 6 dots drawn around the symbol
The Lewis structure of a calcium atom should have 2 dots drawn around the symbol Ca
The Lewis structure of a nitrogen atom should have 5 dots drawn around the symbol N
The Lewis structure of an aluminum atom should have 3 dots drawn around the symbol Al
The Lewis structure of a fluorine atom should have 7 dots drawn around the symbol F
For Oxygen atomThe oxygen atom has 6 electrons in its outermost shell
Hence, the Lewis structure of an oxygen atom should have 6 dots drawn around the symbol
For Calcium atomThe calcium atom has 2 electrons in its outermost shell
Hence, the Lewis structure of a calcium atom should have 2 dots drawn around the symbol Ca
For Nitrogen atomThe nitrogen atom has 5 electrons in its outermost shell
Hence, the Lewis structure of a nitrogen atom should have 5 dots drawn around the symbol N
For Aluminum atomThe nitrogen atom has 3 electrons in its outermost shell
Hence, the Lewis structure of an aluminum atom should have 3 dots drawn around the symbol Al
For Fluorine atomThe fluorine atom has 7 electrons in its outermost shell
Hence, the Lewis structure of a fluorine atom should have 7 dots drawn around the symbol F
Hence,
The Lewis structure of an oxygen atom should have 6 dots drawn around the symbol
The Lewis structure of a calcium atom should have 2 dots drawn around the symbol Ca
The Lewis structure of a nitrogen atom should have 5 dots drawn around the symbol N
The Lewis structure of an aluminum atom should have 3 dots drawn around the symbol Al
The Lewis structure of a fluorine atom should have 7 dots drawn around the symbol F
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Three quantum numbers for an electron in a hydrogen atom in a certain state are
n = 4, e = 1, me = 1. The electron is located in what type of orbital?
a)4p
b)3p
c)4s
d)4d
The electron will be located in is 4p in a hydrogen atom..
Given:
Three quantum numbers for an electron in a hydrogen atom in a certain state:
n = 4, l=1, [tex]m_l=1[/tex]
To find:
The location of an electron.
Solution:
The principal quantum number is given by n. It tells the energy level or orbit in which the electron is residing.Angular momentum quantum number is given by l. It is the shape of an orbital in an orbit in which an electron is found. Each value of 'l' corresponds to the definite shape of an orbital.The magnetic quantum number is given by [tex]m_l[/tex]. It tells us the orientation of the orbital in which electron is presentThe principal quantum number, n = 4
The angular momentum quantum number = l = 1 = p-orbital
The magnetic quantum number = [tex]m_l[/tex] = -l to +l = -l , 0, +1
The electron will be located in is 4p in a hydrogen atom.
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Which of these molecules is an important source of ENERGY for most organisms?
Question 2 options:
glycogen
table salt NaCl
hydrochloric acid
glucose
Answer:
Glucose
Explanation:
Glucose molecule is the primary source of energy for most organisms where processes such as glycolysis starts and cellular respiration follows. Bodies of organisms can get energy from carbohydrates, proteins and fats with carbohydrates being the main component for energy where they are converted to glucose which is a form of sugar that reacts to affect blood sugar levels within an hour or two hours after eating.
The second answer option, table salt (NaCl) is incorrect because sodium added in food is vital for functioning of nerves and muscles. Additionally, it helps in fluid regulation and control of blood pressure/volume in the body.
The third answer , hydrochloric acid is not correct because presence of hydrochloric acid in the body helps in breaking down, digestion and absorption of nutrients.
The correct answer choices are : A and D.
40.3 degrees Fahrenheit. Each hour the temperature decreases by 2.09 What is the
temperature after 2 hours?
Reactivity of the alkali metals is best described by: *
4 points
increases within the group as you descend down the periodic table
decreases within the group as you descend down the periodic table
depends upon the number of valence electrons that are being removed
increased, then decreases for elements with more valence electrons
none of the above
Answer:
Increases within the group as you descend down the periodic table
Explanation:
Hello,
In this case, since the reactivity of alkali metals increases within the group as you descend down the periodic table due to the fact that it is easier for electrons to be given or taken away due to the atomic size, which increases as much as the period increases.
That is why potassium reacts more heavily with water than sodium.
Best regards.
Which of the following reasons explains why some cooking pors are made of metal, but their handles are made of wood? (4 points)
a
Both wood and metal have low thermal conductivity
Both wood and metal have high thermal conductivity
Wood has low thermal conductivity, and metal has high thermal conductivity
Wood has high thermal conductivity, and metal has low thermal conductivity
с
d
Is chloroform a polar molecule? How do you know?
Answer:
A polar molecule does not have an even distribution of electrons. ... Therefore Chloroform is a polar molecule because it does not have an even distribution of molecules, and one end is more negatively charged (Cl) than another (H).
Explanation:
1. How do you determine how many protons are in a neutral element?
Answer:
The number of protons in an atom is always equal to the atomic number.
Explanation:
What is the chemical name for the compound Sb2O5 ?
Answer: Antimony pentoxide
Hope this helps :)
2. Which of these activities would most likely be carried out by a civil engineer who
specializes in environmental engineering?
A. testing steel beams for a large bridge
B. brainstorming ways to prevent landslides on steep slopes
C. designing a new system for unloading cargo from rail cars
D. developing a robot to search for survivors of natural disasters
Applying physical and scientific concepts to the design, development, and maintenance of both the artificially produced environment as well as the naturally occurring built environment is known as civil engineering. The correct option is B.
What does a civil engineer do?In both the public and private sectors, civil engineers conceptualize, design, develop, supervise, run, and maintain infrastructure projects and systems, such as highways, buildings, airports, tunnels, dams, bridges, and water supply and sewage treatment systems.
Traditionally, civil engineering has been divided into a variety of sub-disciplines. It is defined to separate non-military engineering from military engineering and is regarded as the second-oldest engineering subject after military engineering.
A civil engineer make brainstorming ways to prevent landslides on steep slopes. In some locations, a civil engineer is qualified to do land surveying; in other locations, surveying is only permitted for building purposes without a different licence.
Thus the correct option is B.
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Is the following equation balanced? P + 3O₂ ----> 2P₂O₃
Answer:
4P+ 3(O2)= 2(P2O3)
Explanation:
Need to add 4 infront of P on left hand side to balance number of atoms on both sides
what is circulatory role and funcation
Answer:
Transport of gases and nutrients
Explanation:
The circulatory system includes all the vessels that transport blood around the body as well as the blood itself. Sometimes the heart and lungs are also included as part of the circulatory system.
The vessels of the circulatory system are involved in the transport of blood throughout the body. Blood carries the necessary gases to the cells (oxygen) and waste products (CO2) away. It also carries important nutrients to the cells and transports chemical messengers in the form of hormones to their sites of action.
pavitar has a big cup which can hold 9/10 of total seeds . he is trying to fill it with a small cup which can hold 3/10 of total seeds how many full of small cups are required to fill the bigger cup
Answer:
3 small cups
Explanation:
The correct answer would be 3 small cups.
The big cup can hold 9/10 of the total seeds.
The small cup can hold 3/10 of the total seeds.
3 of the small cup would be equivalent to the big cup such that:
3 x 3/10 = 9/10
Hence, 3 small cups = 1 bigger cup.
Which method is better for determining the identity of an element: flame test or spectroscopy?
Answer:
Flame tests are used to identify the presence of a relatively small number of metal ions in a compound. Not all metal ions give flame colors. For Group 1 compounds, flame tests are usually by far the easiest way of identifying which metal you have got. ... Confirm the colors with the elements on Table 1
Explanation:
How many liters of chlorine gas are present if you have 5 moles of Cl2 at STP?
Answer:
Explanation:
One mole of any gas at STP takes up 22.4 L
1 mole of gas = 22.4L
2.5 moles of gas takes up = ( 22.4 L/ 1 mole ) x 2.5 mole
= 56 L
What type of compound is Calcium phosphide?
Answer:
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Calcium phosphide (CP) is the inorganic compound with the formula Ca3P2. It is one of several phosphides of calcium, being described as the salt-like material composed of Ca2+ and P3−.
Explanation:
Answer:
Inorganic Compound
Check all of the boxes that are true about the electron:
it is outside the nucleus
it has a positive charge
it has no mass
it has a negative charge
it is inside the nucleus
it is the same as the atomic number
it is the same as the number of neutrons
Answer:
1,4,6,7
Explanation:
Electrons have a negitive charge and are outside of the nucleus and have the same atomic number and have the same number os nutrons.
