Answer:
Trigonal planar
Explanation:
If a hypothetical molecule XY3 has three electron domains as shown and no lone pairs, the molecule will be trigonal planar in shape.
From the valence shell electron pair repulsion theory, the shape of molecules is dependent on the number of electron domains in a molecule and weather those electron pairs are lone pairs or bond pairs.
Since lone pairs cause more repulsion and take up more space around the central atom than bond pairs, bond pairs cause the bond angle and molecular geometry to deviate from that predicted on the basis of the valence shell electron pair repulsion theory.
Finally, remember that in a molecule, electron pairs are placed as far apart in space as possible to minimize repulsion.
A man is walking in the park at night when he sees a shadow suddenly dart across his path. Which glands will be responsible for controlling his “fight or flight” reaction? Check all that apply.
adrenal
thymus
pancreas
hypothalamus
Answer:
Adrenal and Hypothalamus!
Explanation:
Hope this helps!
Answer:
A man is walking in the park at night when he sees a shadow suddenly dart across his path. Which glands will be responsible for controlling his “fight or flight” reaction? Check all that apply.
Adrenal and Hypothalamus
A woman goes to the doctor for blood tests because she has not been feeling well. Tests show that the sugar levels in her blood are too high. In which gland does she most likely have a problem?
Pancreas
Explanation:
I want to know how I do excess reactant and limiting reactant. Image provided below.
Answer:
Limiting Reactant is going to be NaOH or HCl with given lowest moles. Excess will be the ones with more.
Explanation:
Excess and Limiting reactants are based on the amount you could make in an ideal reaction. M (molarity) is the concentration of the given solutions where moles in the amount (the important part) you have of each. If you only have 0.0100 mol NaOH while you have 0.0400 mol HCl the most a reaction has the potential to use is that 0.0100 mol NaOH, thus making it the limiting reactant as it is limiting the possible amount made. The excess here is 0.0300 mol HCl.
Easy Points
Given the electron configuration: 1s22s22p63s23p64s23d104p65s24d4
Select the correct element
A. Mo
B.Cr
C. Y
D.Sc
Answer:
A. Mo
Explanation:
The given electron configuration: 1s22s22p63s23p64s23d104p65s24d4 shows 42 electrons and Molybdenum has atomic number 42.
But the correct electronic configuration of molybdenum is [Kr]4d5 5s1, and not [Kr]5s24d4 which is based on the diagonal rule.
The diagonal rule states that a half full 5s subshell and half-full 4d subshell are more stable than a full 5s subshell and 4d filled with four electrons.
Hence, the correct element is "A. Mo".
Which of the following indicates the most basic solution?A. [H+] = 1 × 10-10 MB. pOH = 6.7C. [OH-] = 7 × 10-5 MD. pH = 4.2
Answer:
The most basic solution is A
Explanation:
In order to solve the problem, we can compare the pH of the solutions. The most basic solution is the one with the highest pH.
A. [H⁺] = 1 × 10⁻¹⁰ M
pH = - log [H⁺] = - log (1 × 10⁻¹⁰) = 10
B. pOH = 6.7
pH = 14 - pOH = 14 - 6.7 = 7.3
C. [OH⁻] = 7 × 10⁻⁵ M
pOH = - log [OH⁻] = -log (7 × 10⁻⁵) = 4.15
pH = 14 - pOH = 14 - 4.15 = 9.8
D. pH = 4.2
According to this, solution A has the highest pH (pH=10), thus this is the most basic solution.
If an atom has a neutral charge, it must have *
A. More Neutrons than protons
B. More protons than neutrons
C. Same number of electrons and protons
D. Same number of electrons and neutrons
Answer:
C
Explanation:
a cube measures 1.0cm on each side. what is the volume of the cube? if this cube i dropped into 28.0ml of water, what will be the new volume reading on the gratulated cylinder?
3. Unscramble the name of internal organs nesintites
Answer:
intestines?
Explanation:
apparently my answer needs to be 20 words long so I'ma write all this so i can answer
The initial concentration of A in the first order reaction A→3B+2C is 0.535 mol L−1. Given that the rate constant is 0.450 s−1, what is the half-life of the reaction, in seconds? Remember to use correct significant figures in your answer (round your answer to the nearest hundredth).
Answer:
Half life = 1.540 s
Explanation:
A → 3B+2C
Initial concentration = 0.535 mol L−1
rate constant k = 0.450 s-1
half life t1/2 = ?
Since the reaction s a first order reaction
Half life is given by;
t1/2 = 0.693 / k
t1/2 = 0.693 / 0.450 = 1.540 s
An atom has the electron configuration shown below. How many valence electrons are in this atom?
Captionless Image
2
3
4
6
What charge would you expect on an ion of this fictitious atom?
Captionless Image
+3, cation
+5, cation
-5, anion
-3, anion
Which occurrence explains why noble gases are essentially unreactive?
Dipole Interactions
VSEPR Theory
Dispersion Forces
Octet Rule
A covalent bond occurs when ________ are shared between two atoms.
electrons
protons
neutrons
dipoles.
A substance conducts electricity well and has a boiling point of 1478 °C. Is this likely an ionic or covalent substance?
Not enough information to answer.
ionic
covalent
Select all the compounds listed below that are covalent compounds.
B
C
D
A
Captionless Image
A
B
C
D
Captionless Image
Trihocus Dipocus
Dihocus Tripocus
Hocus (II) Pocus
Hocus (III) Pocus
Two nonmetal Halloween elements react to form the compound TriTrick DiTreat. What is the formula? Trick = X and Treat = Y
C
D
B
A
Write the formula for Candycorn Pumpkinate. Candycorn (Cc) has a charge of +3 and pumpkinate (PkO) a charge of -2.
A
B
C
D
Which statement best describes the atomic structure of metals?
Valence electrons packed in a lattice arrangement around cations.
Valence electrons packed in a lattice arrangement around anions.
Closely packed cations with loosely held valence electrons.
Loosely packed cations with tightly held valence electrons.
Which of the following properties is NOT explained by metallic bonding?
Crystalline structures
Malleabilty
Ductility
Thermal conductivity
What is the ionic charge of element X in the compound XP? Phosphorus is in group 15 on the periodic table.
1+
1-
3+
3-
_____________is not reactive with only 2 electrons in its valence shell.
Krypton
Helium
Neon
Xenon
How many electrons are shared in the double bonds in the structural formula shown below?
Captionless Image
2
4
6
8
Option 5
How many lone PAIRS are shown in the molecule below?
Captionless Image
none
2
4
8
A molecule of XY (2 nonmetals) is polar because
X is a metal so exhibits magnetic properties.
X and Y are both ions.
it is ionic and all ionic bonds are polar.
the X atom is able to attract the shared electrons more strongly than a Y atom.
Answer:
question no 4 answer is electrons
For the reaction CzHg + 50, 3CO2 + 4H20, how many moles of carbon dioxide will be produced for each mole of propane (C3Hg) reacted?
O 3
04
05
HELP ME
2) Calculate the volume of a liquid with a mass of 143 grams and a density of 2.3 g/cm”.
Answer:
62.174
Explanation:
volume = mass/density
143/2.3 = 62.174
We are studying Mole and Molar Mass of Elements and Compounds and i need help please thank you!!!
Explaining the concept:
Molar mass of an element is the mass of 6.022*10²³ atoms of that element
a group of 6.022*10²³ atoms or molecules is called 1 mole of that specific element or compound
this number is so large that even though atoms are very small, 6.022*10²³ of them weigh several grams depending on the element the atom belongs to.
Atoms with a larger atomic number have more protons and neutrons than atoms with small atomic number; more protons and neutrons means that they have more matter and hence, more mass
that's why elements with a large atomic number are heavier
for example:
the molar mass (mass of 1 mole or 6.022*10²³ atoms) of hydrogen is approximately '1' grams per mole
whereas,
the molar mass of Carbon (C), (which has only 5 electrons more than hydrogen) is 12 grams per mole
Solving the question:
Finding the number of Moles:
We are given 5.4 grams of Boron (B)
the molar mass of boron is 11 grams per mole
To calculate the number of moles of an element, we divide the given mass by the molar mass
Number of moles = Given mass / Molar mass
Number of moles = 5.4 / 11
Number of moles = 0.5 (approx)
Finding the number of Atoms:
Now that we have the number of moles, we can easily find the number of atoms by dividing it by 6.022*10²³ (since a group of 6.022*10²³ atoms is 1 mole)
Number of Atoms = Number of moles * 6.022*10²³
Number of atoms = 0.5 * 6.022*10²³
Number of atoms = 3.011 * 10²³
Write the formula for each compound that contains a polyatomic ion. potassium bicarbonate: aluminum phosphate: copper(II) hydroxide:
Explanation:
A polyatomic ion refers to an ion that contains more than one atom.
Potassium Bicarbonate contains the Potassium ion and bicarbonate ion.
The formula is given as; KHCO₃
Aluminium Phosphate contains the Aluminium ion and Phosphate ion.
The formula is given as; AlPO4
Copper(II)hydroxide contains copper ion and hydroxide ion.
The formula is given as; Cu(OH)₂
A sample of Ar gas has a pressure of 1.20 atm at 125°C and a volume of 1.00 L. What would the temperature be (°C) with a pressure of 1.80 atm and constant volume?
Answer:
597K
Explanation:
Given parameters:
Initial pressure = 1.2atm
Initial temperature = 125°C = 125 + 273 = 398K
Initial volume = 1.00L
Final pressure = 1.80atm
Final volume = 1.00L
Unknown:
Final temperature = ?
Solution:
To solve this problem, we must understand that at constant volume, the pressure of a given mass of gas varies directly with the absolute temperature.
Mathematically;
[tex]\frac{P_{1} }{T_{1} }[/tex] = [tex]\frac{P_{2} }{T_{2} }[/tex]
where P and T are the pressures
1 and 2 are the initial and final states
Now insert the parameters and solve;
[tex]\frac{1.2}{398}[/tex] = [tex]\frac{1.8}{T_{2} }[/tex]
T₂ x 1.2 = 398 x 1.8
T₂ = 597K
The electronegativity of manganese is 1.6, sulfur is 2.5, oxygen is 3.5, chlorine is 3.0, and bromine is 2.8. With which element will manganese
react to form ionic compounds?
A. sulfur
B. oxygen
C. chlorine
D. bromine
1.
(02.01 LC)
Modern atomic theory states that atoms are neutral. How is this neutrality achieved? (3 points)
Equal number of neutrons and protons
More electrons than protons
Equal number of protons and electrons
More neutrons than electrons
How many gold atoms are present in 4.0 x 10-10 mol of gold?
Answer:
2.408 x 10^14
Explanation:
Which of the following is NOT a property of all metals?
a. conduct electricity b. shiny
c. does not conduct heat d. malleable when solid
Answer: Shiny
Explanation:
A piston is holding 125 mL of gases at a temperature of 300 K and a pressure of 2.39 atm. What is the volume of the gases if the temperature is increased to 500K and the pressure falls to 2.15 atm
Answer:
231.59 mL
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 125 mL
Initial temperature (T₁) = 300 k
Initial pressure (P₁) = 2.39 atm
Final temperature (T₂) = 500 k
Final pressure (P₂) = 2.15 atm
Final volume (V₂) =..?
The new volume of the gas (V₂) can be obtained by using the combined gas equation as shown below:
P₁V₁ /T₁ = P₂V₂ /T₂
2.39 × 125 /300 = 2.15 × V₂ /500
Cross multiply
300 × 2.15 × V₂ = 2.39 × 125 × 500
645 × V₂ = 149375
Divide both side by 645
V₂ = 149375/645
V₂ = 231.59 mL
Therefore, the new volume of the gas is 231.59 mL
Is electrons positive or negative?
Answer:
Negative
Explanation:
Because i learned it in 5th grade
Answer:
negative
Explanation:
When you are missing an electron or two, you have a positive charge. When you have an extra electron or two, you have a negative charge.
Which component is missing from the process of cellular respiration? Glucose + Oxygen → Carbon Dioxide + ________ + Energy (4 points) a Water b Sugar c Oxygen d Carbon
Answer: Oxygen or carbon I’ll say oxygen
Explanation:
A recently reported mutase may generate an intermediate having a free radical. If you studied this reaction, what evidence would you look for in the mechanism that would be characteristic of other mutase reactions?
Answer:
homolytic cleavage of a covalent bond.
Explanation:
Homolytic cleavage: In chemistry, the term "homolytic cleavage" is described as a process that involves breaking of a particular covalent bond in a way that every fragment tends to get "one" shared electrons and it often produces or gives rise to free radicals. It is also referred to as "homolysis" or "homolytic bond cleavage".
In the question above, the given statement represents "homolytic cleavage of a covalent bond".
A solution contains 1.694 mg CoSO4 (155.0 g/mol) per milliliter. Calculate (a) the volume of 0.08640 M EDTA needed to titrate a 25.00-mL aliquot of this solution. (b) the volume of 0.009450 M Zn2 needed to titrate the excess reagent after addition of 50.00 mL of 0.08640 M EDTA to a 25.00-mL aliquot of this solution.
Answer:
the answer is in the screenshot
Explanation:
hope this helps
Moles of any substance is given by the molar mass and the mass. The volume of EDTA required to titrate is 3.16 mL and the volume of zinc required to titrate is 22.8 mL.
What is molarity?Molarity is the property of the solution that gives the concentration of the solute present in the solution.
Given,
Mass of cobalt sulfate = 1.697 gm
The molar mass of cobalt sulfate = 155 g/mol
In the first part, the volume of the aliquot is 25 mL and the molarity is 0.08640 M.
The reaction is shown as:
Co²⁺ + H₄Y → CoH₂Y + 2H⁺
Moles of cobalt: n = 0.001694 ÷ 155 = 0.0000109 moles
In 25 ml aliquot moles of cobalt are, 0.000273 moles.
The volume of EDTA solution is calculated as:
V = moles ÷ Molarity
= 0.000273 mole ÷ 0.0864 mol/ L
= 3.16 mL
Hence, 3.16 mL of EDTA is required.
For the second part, moles of EDTA are calculated as:
n = 0.008640 × 0.050 = 4.32 ×10⁻⁴
In a 25 mL, sample moles of EDTA are 2.16 × 10⁻⁴ moles.
Excess moles of EDTA in the solution:
0.000432 - 0.000216 = 0.000216 moles
The volume of EDTA is calculated as:
V = 0.000216 ÷ 0.009450
= 0.0228 L
Hence, 22.8 mL of zinc is required.
Learn more about molarity here:
https://brainly.com/question/22714469
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Thunderstorms and hurricanes are examples of severe weather. Which of these weather conditions is necessary for the formation of thunderstorms and hurricanes? O Cold rain falling to the ground. O Air masses combining to create a high-pressure area. O Winds spiraling dowrward and away from the center of a storm. O Air moving toward the center of a storm and rising into the atmosphere.
Answer:
O Winds spiraling dowrward and away from the center of a storm.
Explanation:
this is correct
what does it mean atoms form chemical bonds to become happy. what does happy really mean
Answer:
so if an atom needs and electron it will form a bond with another so it will balance out.
Explanation:
1. Where is the Cascade Range found? 2. What does the Cascade Range include?
3. What formed the Cascade mountains?
4. What is a plate boundary?
5. List the three ways plates interact.
6. What is subduction?
7. What is the Ring of Fire?
8. What do colliding plates form?
1. Cascade Range, segment of the Pacific mountain system of western North America. The Cascades extend northward for more than 700 miles (1,100 km) from Lassen Peak, in northern California, U.S., through Oregon and Washington to the Fraser River in southern British Columbia, Canada.
2.The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, and the notable volcanoes known as the High Cascades.
3.The Cascade Volcanoes were formed by the subduction of the Juan de Fuca, Explorer and the Gorda Plate (remnants of the much larger Farallon Plate) under the North American Plate along the Cascadia subduction zone.
4.What are Plate Boundaries? Plate boundaries are the edges where two plates meet. Most geologic activities, including volcanoes, earthquakes, and mountain building, take place at plate boundaries.
5.Contents
1 Divergent boundaries.
2 Convergent boundaries (subduction zone)
3 Orogenic belts.
4 Transform boundaries.
____________________
6.Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced to sink due to high gravitational potential energy into the mantle. ... Subduction zones are sites that usually have a high rate of volcanism and earthquakes.
7.The Ring of Fire is a major area in the basin of the Pacific Ocean where many earthquakes and volcanic eruptions occur.
8.The impact of the colliding plates can cause the edges of one or both plates to buckle up into a mountain ranges or one of the plates may bend down into a deep seafloor trench. A chain of volcanoes often forms parallel to convergent plate boundaries and powerful earthquakes are common along these boundaries.
a cylinder has a mass of 14.98g and a volume of 2.10 ml. what is the cylinder's density?
Answer:
7.133 g/cm^3
Explanation:
Density = mass ÷ volume
Given,
mass = 14.98 g
Volume = 2.10 ml = 2.10cm^3 [because 1 ml= 1cm^3]
density = 14.98÷ 2.10
density = 7.133 g/cm^3
Answer:
[tex]\boxed {\tt d\approx7.13 \ g/mL}[/tex]
Explanation:
The density of an object can be found by dividing the mass by the volume.
[tex]d=\frac{m}{v}[/tex]
The mass of the cylinder is 14.98 grams.
The volume of the cylinder is 2.10 milliliters.
[tex]m=14.98 \ g\\v= 2.10 \ mL[/tex]
Substitute the values into the formula.
[tex]d=\frac{14.98 \ g}{2.10 \ mL}[/tex]
Divide.
[tex]d=7.13333333 \ g/mL[/tex]
Round to the nearest hundredth. The 3 in the thousandth place tells us to leave the 3 in the hundredth place.
[tex]d\approx 7.13 \ g/mL[/tex]
The density of the cylinder is about 7.13 grams per milliliter.
A certain electromagnetic radiation has a wavelength of 5.4x10-7m. What is the frequency of this
electromagnetic radiation?
O 1.8 x 10-65-1
O 5.6 x 1014 5-1
O 1.6 x 1011 51
O 1.8 x 10-155-1
O 5.6 x 10551
Answer:
5.6 x 10¹⁴m
Explanation:
Given parameters:
Wavelength = 5.4 x 10⁻⁷m
Unknown:
Frequency of the electromagnetic radiation = ?
Solution:
The speed of all electromagnetic radiation is given as 3.0 x 10⁸m/s
So;
Speed = frequency x wavelength
Wavelength = [tex]\frac{speed}{frequency}[/tex]
Insert the parameters and solve;
Wavelength = [tex]\frac{3 x 10^{8} }{5.4 x 10^{-7} }[/tex]
Wavelength = [tex]\frac{3}{5.4}[/tex] x 10⁸⁻⁽⁻⁷⁾
Wavelength = 5.6 x 10⁻¹ x 10¹⁵
Wavelength = 5.6 x 10¹⁴m
in 3 minutes, one half of an original sample of polonium will decay. What happens to the other half?
Which element is classified as a noble gas?
Oz Ō
Xe
Answer:
Group 8A (or VIIIA) of the periodic table are the noble gases or inert gases: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). The name comes from the fact that these elements are virtually unreactive towards other elements or compounds.
Explanation:
its XE