Answer:
159.09 mmHgExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
From the question we have
[tex]P_2 = \frac{125\times3.50 }{2.75} = \frac{437.5}{2.75} \\ = 159.090909...[/tex]
We have the final answer as
159.09 mmHgHope this helps you
asap help for brainlst
List the 7 diatomic elements in the periodic table.
Question 5 options:
All alkaline earth metals- Be, Mg, Ca, Sr, Ba,Ra.
All elements in the periodic table are diatoms.
H2, N2, O2,F2, Cl2, Br2, I2
All group 16 elements-O, S, Se, Te, Po.
Answer:
Group 2A (or IIA) of the periodic table are the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They are harder and less reactive than the alkali metals of Group 1A. The name comes from the fact that the oxides of these metals produced basic solutions when dissolved in water, and they remained solids at the temperatures available to the ancient alchemists. Like the Group 1A elements, the alkaline earth metals are too reactive to be found in nature in their elemental form.
The alkaline earth metals have two valence electrons in their highest-energy orbitals (ns2). They are smaller than the alkali metals of the same period, and therefore have higher ionization energies. In most cases, the alkaline earth metals are ionized to form a 2+ charge.
The alkaline earth metals have much higher melting points than the alkali metals: beryllium melts at 1287ºC, magnesium at 649ºC, calcium at 839ºC, strontium at 768ºC, barium at 727ºC, and radium at 700ºC. They are harder metals than the Group 1A elements, but are soft and lightweight compared to many of the transition metals.
Salts of the Group 2A metals are less soluble in water than those of Group 1A because of the higher charge densities on the 2+ cations; nevertheless, many Group 2A salts are at least moderately soluble. Some Group 2A salts bond strongly to water molecules, and crystallize as hydrates; among these are Epsom salt, MgSO4·7H2O, and gypsum, CaSO4·2H2O.
Explanation:
Answer:
H2, N2, O2, F2, Cl2, Br2, I2
Explanation:
The 7 diatomic elements in the periodic table are Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine and Iodine.
Correct measurement for solubility
Answer:
g/100g
Explanation:
grams per 100 g of solvent or short term g/100g
Answer:
grams of solute per milliliters of solution
Explanation:
ur welcome
What is the relationship between temp./color and magnitude
(STARS)
Answer:
The surface temperature of a star determines the color of light it emits. Blue stars are hotter
hope this helps :)
What is the molarity of Na+ ions in a 0.02M sodium phosphate solution?
Answer:
.06 M NA+
Explanation:
You go from (.02M Na3PO4 / 1) x (3 mole Na+ / 1 mole Na3PO4) = .06 M Na+
what happens to the size of the an atom when it becomes an negative ion?
Answer
The negative ion is larger than the original atom.
Explanation:
This means that with fewer electrons but the same number of positive protons, the size of the ionic radius will decrease.
I hope this helped!
Match the vocabulary word to its definition.
neutron
the central part of the atom containing
protons and neutrons
proton
a negatively charged particle that orbits
the nucleus of an atom
nucleus
a neutral particle located in the nucleus
of an atom
electron cloud
a positively charged particle located in
the nucleus of an atom
electron
the area of the atom surrounding the
nucleus where electrons can be found
Intro
Done
Answer:
neutron --> a neutral particle located in the nucleus of an atomproton --> a positively charged particle located in the nucleus of an atomnucleus --> the central part of the atom containing protons and neutronselectron cloud --> the area of the atom surrounding the nucleus where electrons can be foundelectron --> a negatively charged particle that orbits the nucleus of an atomThe volume of a gas must be measured at several points during an experiment. Which units should be used to describe the volume of the gas?
liters
centimeters
degrees Celsius
milligrams
Answer:liters
Explanation:
What is the oxidation half-reaction for 2Mg + O2 + 2Mgo?
A. O2 + 4e + 202-
B. 202- → 02 + 4e
C. Mg2+ + 2e → Mg
O D. Mg → Mg2+ + 2e
Answer:
OPTION C is correct
When magnesium burns, it combines with oxygen (O2) from the air to form magnesium oxide (MgO) according to the following equation: 2Mg(s) + O2(g) → 2MgO(s) Magnesium oxide is an ionic compound containing Mg2+ and O2− ions whereas Mg(s) and O2(g) are elements with no charges.
What is the unabbreviated electron configuration for Barium?
Answer:
[Xe] 6s2
Explanation:
hope it helps Electron configuration
Sort the following elements in order from least reactive to most reactive.
A - Sb
B - S
C - F
D - As
Sorting the chemical elements in order from least reactive to most reactive, we have:
1. Fluorine (F).
2. Arsenic (As).
3. Antimony (Sb).
4. Silicon (S).
Given the following chemical elements:
Antimony (Sb).Silicon (S).Fluorine (F).Arsenic (As).Reactivity can be defined as a chemical property which determines how readily a chemical element bonds with other chemical elements, in order to form a new chemical compound.
Generally, the ability of a chemical element to bond with other chemical elements is largely (highly) dependent on the number of valence electrons it has in the outermost shell of its atomic nucleus.
As a general rule, chemical elements that are having fewer number of valence electrons are the most reactive while those having higher valence electrons are least reactive.
Also, chemical reactivity decreases down a group on the periodic table.
Based on the periodic table, the valency for the given chemical elements are:
Antimony (Sb): 5 valence electrons.Silicon (S): 4 valence electrons.Fluorine (F): 7 valence electrons.Arsenic (As): 5 valence electrons.In conclusion, sorting the chemical elements in order from least reactive to most reactive, we have:
1. Fluorine (F).
2. Arsenic (As).
3. Antimony (Sb).
4. Silicon (S).
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Can someone please help me with these questions? I put them on here and some keep getting taken down. I need help asap!
Answer the following questions in complete sentences.
Why do you think that you had to use a thin layer of onion skin, rather than a thick layer for the microscope?
When iodine reacts with starch, it produces a blue-black color. Starch is a white substance which plants use to store food. What structure did you see better because of the iodine? Why did you see this structure better?
From low power to high power, what structures became clearer in the unstained onion tissue?
From low power to high power, what structures became clearer in the stained onion tissue?
What is the shape of an onion cell?
Ques.1: Why do you think that you had to use a thin layer of onion skin, rather than a thick layer for the microscope?
Ans:- It is because, I the onion peel is thick layered, then it will be hard or impossible to see through the microscope.
Ques.2: When iodine reacts with starch, it produces a blue-black color. Starch is a white substance which plants use to store food. What structure did you see better because of the iodine? Why did you see this structure better?
Ans: Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil.
This makes a linear triiodide ion complex with is soluble that slips into the coil of the starch causing an intense blue-black color.
Due to this, we can see the structure better.
Ques.3: From low power to high power, what structures became clearer in the stained onion tissue?
Ans: From lower to higher power, we can see:-
-- Large, rectangular interlocking cells,
-- Clearly visible distinct cell walls surrounding the cells,
-- Dark stained nucleus,
-- Large vacuoles at the center,
-- Small granules may be observed inside the cells (within the cytoplasm)
Ques.4: What is the shape of an onion cell?
Ans: The shape of an onion cell is rectangular or square in shape.
In chemical compounds, covalent bonds form when -
a. the electronegativity difference between two atoms is very large
b. electrons are completely transferred between two metals
c. pairs of electrons are shared between two nonmetal atoms
d. two nonmetal ions are attracted to each other by opposite charges
Answer:
c. pairs of electrons are shared between two nonmetal atoms
Explanation:
Bonding between elements solely depends on their electronegativity. When there is large difference in electronegativity, those atoms form ionic bonds. Covalent bonds form when the difference is minimal, or none at all. When the difference between electronegativities is 0 or very close to 0, then they form pure covalent bonds, or nonpolar bonds. An example of this are diatomic molecules. Diatomic molecules are two of the same atom that form nonpolar covalent bonds because their electronegativy difference is 0, as they have the same electronegativity. When the electronnegativties have bit of difference, they form polar covalent bonds.
how would separate a mixture of lead 2 chloride and sodium chloride
Answer:
lower th
Explanation:
Pb{Cl}_{2})$ is an inorganic
answer:
lower the temperature so the lead chloride settles out of solution
compound which is a white solid under ambient conditions. It is one of the most important lead-based
reagents. It is poorly soluble in water. And it is insoluble in cold water. Sodium chloride is ssolble at all temperature
so lower the temperature
how is the miscibility of two liquids related to their polarity?
Answer:
The more polar the liquid, the more likely that it is miscible with water. The polarity of a liquid does not affect its miscibility with water. The less polar the liquid, the more likely that it is miscible with water. The more polar the liquid, the less likely that it is miscible with water.
Explanation:
hope it helps you
Miscibility of two liquids are directly related to their polarity. The likelihood that a liquid will mix with water increases with its polarity.
What is polarity?Polarity is the arrangement of electrical charge among the atoms connected by a chemical bond. Because both hydrogen atoms in H2 were electrically neutral, bonds among atoms of different elements were electrically inequivalent, as opposed to bonds among identical atoms, which are electrically uniform.
The likelihood that a liquid will mix with water increases with its polarity. Liquid miscibility with water is unaffected by the polarity of the liquid. The likelihood that a liquid will mix with water increases with decreasing polarity. The likelihood that a liquid will be miscible with water decreases with increasing polarity.
Therefore, miscibility and polarity are directly related.
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Which group of nonmetals will react with alkaline earth metals to form a compound in a one-to-one ratio?
Question 3 options:
Group 15
Group 16
Group 17
Group 18
Answer:
Group 17
Explanation:
Group 16 of nonmetals will react with alkaline earth metals to form a compound in a 1 : 1 ratio. Therefore, option (b) is correct.
What is the alkaline earth metals?Alkaline earth metals or Group 2 includes six elements which are Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), and Radium (Ra).
This group contains smooth, silver metals with a less metallic character than group 1. All alkaline earth metals have two valence electrons, giving a valency of 2. These metals easily lose electrons to form compounds via ionic bonds and become more stable.
The valency of calcium is 2 and the valency of the elements of group 16 is also 2. Therefore they can combine 1 : 1 ratio to form a neutral compound.
Ca²⁺ + O²⁻ → CaO
Therefore, the nonmetals of group 16 will react with alkaline earth metal.
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What are the word equations for the following? Please help
Calcium oxide + water
Magnesium + hydrochloric acid
Sodium hydrogen carbonate + citric acid
Iron + salt water
Calcium oxide + water = calcium hydroxide.
Magnesium + hydrochloric acid = magnesium chloride + hydrogen.
Sodium hydrogen carbonate + citric acid = Na3C6H5O7(aq)+3H2O(l)+3CO2(g)
Iron + salt water = 4Fe(OH)3 (rust)
Answer:
1. CaO + H2O _____ Ca(OH)2
Calcium oxide + Water _____ Calcium hydroxide
2. 2 HCI + MG _____ MgCl2 + H2
Magnesium + hydrochloric acid _____ Magnesium Chloride + hydrogen gas
The substances on the left side of a chemical equation are called the:
Select one:
a.
Ingredients
b.
Reactants
c.
Components
The coefficients in a balanced chemical equation directly represent moles of reacting substances. true or false
The statement "The coefficients in a balanced chemical equation directly represent moles of reacting substances." is true.
What is a balanced equation?A balanced equation is one in which there is an equal number of atoms present on both sides of the reaction. When the atoms of elements in the reaction equal the atoms of elements or compounds in the products. The number of moles is similar before and after the reaction.
The chemical equation is the mathematical representation of any reaction, the number written on the front of the element or compound represents the number of atoms of the element present in the reaction. These numbers are called the coefficient of the chemical equation.
Thus, the statement is true, because the coefficients tell the mole of reacting substance.
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If Temperature 25 C and volume is 117.5 cm³. Explain volume temperature relationship using Charles’s law.
(No links or else I'll report.
Don't answer if u dont know.)
Thank You.
Explanation:
According to Charles law : V/T=k (constant).
the volume temperature relationship will be
V/T = 117.5/25 = 4.7
hope this helps you.
que es y que define a los elementos quimicos
Un elemento químico, o un elemento, se define como un material que no puede descomponerse ni transformarse en otra sustancia por medios químicos. Cada elemento se identifica según la cantidad de protones que tiene en su núcleo atómico. Se puede crear un nuevo elemento agregando más protones a un átomo.
_________
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ITZY :)
Explain why ions have a charge on them.
Answer:
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.
How do you find the frequency of a recorder?
Answer:
Modern recorders are most commonly pitched at A=440 Hz, but among serious amateurs and professionals, other pitch standards are often found. For the performance of baroque music, A=415 Hz is the de facto standard, while pre-Baroque music is often performed at A=440 Hz or A=466 Hz.
Explanation:
does anyone know how to find the electron configuration of an element without using a periodic table?? group and period is already given
PLEASE HELP
If an atom has a negative charge, it has ___ protons than electrons.
A) More
B) Less
C) The same amount
Answer:
less
Explanation:
An electron has a charge of -1 so if there are more electrons than protons the overall charge of the atom is going to be negative
Choose the statement that is TRUE. Question 26 options: Outer electrons efficiently shield one another from nuclear charge. All of the answers are true Valence electrons are most difficult of all electrons to remove. Core electrons effectively shield outer electrons from nuclear charge. Core electrons are the easiest of all electrons to remove.
The statement which is true is Core electrons effectively shield outer
electrons from nuclear charge.
Core electrons are those which are in close proximity with the nucleus. The
core electrons repel the outer electrons farther away from the nucleus to
shield it from nuclear charge.
The valence electrons are usually found in the outermost part of the shell
and they are the easiest to remove due to the fact that they have to achieve
a stable octet configuration which makes them easily removed during
chemical reactions.
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Answer: core electrons effectively shield outer electrons from nuclear charge
Explanation:
I have to answer questions about science
Answer:
What Questions?
Explanation:
What Questions?
Answer:
Explanation:
What is the Questions frist ?
Draw the structures of the compounds
1. 2,4-dimethylhexane
2. 3,3-diethyl-4-methyl-5propyloctane
Please I need help
Answer:
Explanation:
2,4 di methyl means that there are 2 methyl groups on the 2 and 4 carbons. hexane means there are 6 carbons in total for the carbon chain
first pic
3,3 diethyl means there are 2 ethyl groups on the 3 carbon chain. 4 mthyl means 1 methyl group on the 4 carbon chain, 5 propyloctane means that there are 1 propylo on the 5 carbon chain. and that the carbon chain is a octane meaning 8 carbons.
second pic
c. 0.0023 moles of CO2
Answer:
0.1gram
Explanation:
mass = no of moles × molar mass
Calculate the molecular mass of the element
They give:H=1,AI=27,S=32,0=16,Cu=64,P=31,Mg=24,N=14,Na=23
Answer:
Cu3 (PO4)2
3×64 + 2×(31+ 4×16)
192 + 2×(31+64)
192 + 2×(95)
192+190
=382g
what element is 1s2 2s2 2p3