Answer:
The Group 7A elements have seven valence electrons in their highest-energy orbitals (ns2np5). This is one electron away from having a full octet of eight electrons, so these elements tend to form anions having -1 charges, known as halides: fluoride, F-; chloride, Cl-, bromide, Br-, and iodide, I-.
...
Group 7A — The Halogens.
(7)
(8)
(9)
(10)
Explanation:
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1. What branch of chemistry is foundational to the other
areas of chemistry?
Answer:
Physical, Inorganic, Biochemistry, Analytical, and Organic
Physical chemistry deals with applying physics to the study of matter. It's also probably the most important branch. Inorganic chemistry deals with stuff that is chemically composed of elements other than carbon. The branch of Biochemistry concerns itself with living things. Analytical chemistry deals with analyzing and finding out what substances are present in a particular material and how much of each substance is present. Finally, organic chemistry deals with substances that are compounds of carbon.
Explanation:
Which of the following are covalent compounds? Select all that apply.
CaO
CO2
KBr
NO
Answer
CO2 and NO are covalent
Explanation:
Which of the following are covalent compounds? Select all that apply.
CaO
CO2
KBr
NO
the atoms ib covalent compounds share electron pairsO
CaO and KBr are ioinic
CO2 and NO are covalent
The covalent compounds are [tex]CO_2[/tex] and [tex]NO[/tex].
The covalent compounds are bonded to each other by the mutual sharing of electrons between them referred to as the covalent bond in the structure.
Covalent bonds are chemical bonds formed when two atoms share electrons to achieve a stable electron configuration. In covalent bonding, atoms combine by sharing their outermost electrons to achieve a full valence electron shell.
Covalent bonds typically form between nonmetal elements that have similar electronegativities.
The rest of the compounds are held by the ionic forces of attraction and hence referred to as the ionic compounds. An ionic compound contains a metal and a non-metal to be bonded to each other.
Therefore, the covalent compounds provided in the list are [tex]CO_2[/tex] and [tex]NO[/tex].
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The crystal size of an igneous rock is described as its _____.
Explanation:
The crystal size of an igneous rock is described as it's texture
What forms of energy are emitted from stars? (Select all that apply.) invisible light chemical heat sound visible light
Answer:
electromagnetic radiation
Explanation:
heat sound and invisible light
Please help me out !!
How would you gather data to in order to determine the density of a marble
The average mass of a marble can be determined by dividing the total mass of the marbles by the total number of marbles: average mass of a marble.
To find the density of any object, you need to know the Mass (grams) of the object, and its Volume (measured in mL or cm³). Divide the mass by the volume in order to get an object's Density.
Use the formula p=m/V, or density (p) is equal to mass (m) divided by volume (V).
To determine the density of a marble, we must know its mass and volume.
In order to determine the density of any substance we need to know its mass and volume.
Let's understand "Density".
The density of a substance is its mass per unit volume. It is represented with "ρ" this symbol.It can be given by the formula which is shown below: ρ= [tex]\frac{m}{V}[/tex] where m is the mass of the substance and V is the volume.Density indicates how much of a substance occupies a specific volume at a defined temperature and pressure. The density of a substance can be used to define the substance.Learn more:
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Your private gas collection consists of the four following gases, with each gas in a separate container, and exactly 1.0 g of each gas: CO2(g). Ne (g), Cl2
(g), and H2S (g). Which of your prized gases occupies the smallest volume at standard temperature and pressure (STP)?
H2S (g)
CO2 (g)
Cl2 (g)
Ne (g)
Answer:Cl2
Explanation:each gas is 1 gm and has the same P andT. The gas with the highest molar mass will have the lowest volume with least moles. Cl2 wins the prize
chemists use solution concentration units to
Spirit of Australia, a hydroplane boat, made speed records by traveling 239 miles in 0.75 hours (45 minutes). What is its record- breaking speed?
Answer:
the answer is 319 mph
Explanation:
you do 239/.75 (45 minutes will get you a different answer)
When hydrogen sulphide is burnt in oxygen to form sulphur(is) oxide and what. How does the oxidation number of sulphur change?
Answer:
Explanation:
Hydrogen sulphide burns in air to form sulphur dioxide: 2H2S + 3O2 → 2H2O + 3SO2. In this reaction, the sulphur is oxidized from -2 to +4. In the reaction H2S + 2O2 → H2SO4 + 790 kJ/mol, the oxidation is from -2 to +6.
When hydrogen sulphide is burnt in oxygen to form sulphur dioxide and water (H₂O), the oxidation number of sulfur changes from -2 in H₂S to +4 in SO₂.
When hydrogen sulfide (H₂S) is burnt in oxygen (O₂) to form sulfur dioxide (SO₂) and water (H₂O), the oxidation number of sulfur changes from -2 in H₂S to +4 in SO₂.
The balanced chemical equation for the reaction is:
2 H₂S + 3 O₂ → 2 SO₂ + 2 H₂O
In hydrogen sulfide (H₂S), sulfur has an oxidation number of -2 because hydrogen has an oxidation number of +1, and the overall molecule is neutral (since it is uncharged).
In sulfur dioxide (SO₂), sulfur has an oxidation number of +4 because oxygen has an oxidation number of -2, and the overall molecule is neutral.
The change in the oxidation number of sulfur can be seen as follows:
H₂S (initial state) → SO₂ (final state)
-2 (initial oxidation number of sulfur) → +4 (final oxidation number of sulfur)
During the reaction, sulfur is oxidized from an oxidation state of -2 in hydrogen sulfide to +4 in sulfur dioxide. This means that sulfur loses electrons during the reaction, leading to an increase in its oxidation number. The oxygen molecules in the oxygen gas (O₂) act as the oxidizing agent, causing sulfur to undergo oxidation and form sulfur dioxide.
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why is there no base unit for volume
Answer: Volume. Litre (L) and millilitre (mL) are non-SI units, but because they are easier to write and pronounce, they are in common use.
Explanation: I think the explanation is the answer also
how does a battery get its power?
Answer:
Batteries get its power from the stored energy inside it- chemical energy- which is then converted into electrical energy. The flow of the electrons allow the electric current to do work.
Explanation:
11. Which is the solubility product expression for Na3PO4(s)?
Answer: B
Explanation: the 3 in Na3PO4(s) belong to the sodium atom (Na). so in any of these equations, the 3 would have to be with Na.
A- the 3 is along w the PO4, which would make it part of that bond
C- there is no 3 at all for Na in this choice, making it incorrect
D- Again, the 3 is placed on the other half of the bond
Hydrogen and nitrogen combine to form ammonia. When nitrogen and hydrogen bond, nitrogen pulls the electrons from hydrogen toward itself. Which statement about the reactants is correct?
A)Hydrogen is oxidized, and nitrogen loses electrons.
B)Hydrogen gains electrons, and nitrogen is reduced.
C)Hydrogen is reduced, and nitrogen is oxidized.
D)Hydrogen is oxidized, and nitrogen is reduced.
The correct option s D.
Because from the reaction of hydrogen and nitrogen to form ammonia, Hydrogen is oxidized, nitrogen is reduced.
Therefore, Nitrogen gas is the oxidizing agent and hydrogen gas is the reducing agent.
This is called a redox reaction
Redox reaction is a chemical reaction in which electrons can move from one atom to another leading to change of oxidation states.
In this reaction nitrogen gas act as an oxidizing agent and hydrogen gas actsas a reducing agent.
N2+3H2 = 2NH3
(g). (g)
From the reaction, oxidation number of nitrogen is 0 on the reactants' side to
3.
The decrease in the oxidation number of nitrogen indicate that it is being reduced.
On the other hand, the oxidation number of hydrogen move from on the reactants' side to +1 on the products' side. This increase in the oxidation number of hydrogen indicate that hydrogen is oxidized.
Therefore, nitrogen gas is reduced to ammonia and hydrogen gas is oxidized to ammonia
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A diver breathes a heliox mixture with an oxygen mole fraction of 0.050. What must the total pressure (in atm) be for the partial pressure of oxygen to be 0.21 atm?
Answer:
4.2 atm
Explanation:
Dalton’s Law of Partial Pressures
PA = XA(PT)
Partial pressure of A = mole factor of gas A x total pressure of all gases
PA = 0.21 atm
XA = 0.050
PT= ?
0.21atm= 0.050(PT)
0.21/0.050 = PT
PT = 4.2 atm
The total pressure of gases must be 4.2 atm for the partial pressure of oxygen to be 0.21 atm.
How to calculate partial pressure?The partial pressure of a gas can be calculated using Dalton's law of partial pressure equation as follows:
PA = XA(PT)
Where;
PA = partial pressure of oxygen XA = mole factor of oxygenPT = total pressure of all gasesBased on the information given in this question;
PA = 0.21 atmXA = 0.050PT= ?0.21 atm = 0.050 (PT)
0.21/0.050 = PT
PT = 4.2 atm
Therefore, the total pressure of gases must be 4.2 atm for the partial pressure of oxygen to be 0.21 atm.
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Why is the spectroscope scale illuminated?
Answer:
The spectroscope scale is illuminated so that one can know exactly where the wavelengths of the lines are falling along.
What happens when white light passes through a blue then a yellow filter
Answer quick
Answer:
At the end, no light passes through.
Explanation:
First, when white light enters a blue filter, only blue light is allowed to pass through, and all the other components of light are absorbed. When blue light then reaches the yellow filter, it absorbs the blue light, because it is designed to allow only the yellow component of the light to pass through. White light consists of the seven rainbow colours: red, orange, yellow, green, blue, indigo and violet.
Choose the names of the substances for reactants of the equation
2H2 + O2—— 2H2O
The names of the substances for the reactants in the chemical equation 2H₂ + O₂ → 2H₂O are; Hydrogen gas (H₂) and Oxygen gas (O₂). Option A and C is correct.
Hydrogen gas (H₂) - This is the molecular form of hydrogen, consisting of two hydrogen atoms bonded together.
Oxygen gas (O₂) - This is the molecular form of oxygen, consisting of two oxygen atoms bonded together.
In a chemical equation, the reactants are the substances that undergo a chemical reaction to form new products. In this case, the reactants are hydrogen gas (H₂) and oxygen gas (O₂). The arrow (→) in the equation represents the direction of the reaction, indicating that hydrogen gas and oxygen gas react to form water (H₂O).
The coefficient 2 in front of H₂ and H₂O indicates that two molecules of hydrogen gas react with one molecule of oxygen gas to produce two molecules of water. The balanced chemical equation shows the stoichiometry of the reaction, indicating the number of molecules of each reactant and product involved in the reaction.
Hence, A. C. is the correct option.
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--The given question is incomplete, the complete question is
"Choose the names of the substances for reactants of the equation
2H₂ + O₂ → 2H₂O Options; A) Hydrogen B) Water C) Oxygen."--
classification of animals is done why
Answer:
in order to reduce and simplify the study of the animals
to be able to group animals in their appropriate groups
Explanation:
when we classify organisms that means that we take a large number of organisms and group them to a single and correct group that will help the scientists across the world to identify organisms easily
How does a vaccine impact the individuals who receive it?
O They will likely still develop the disease but will not die from i
O They will not be able to get the disease but can still pass it or
O Their bodies will remember the disease and be able to fight it
O They will become sick with the illness but then recover.
Answer fast pls
Answer:
I want to say (A) but i also want to say (C) but i can be wrong. most likely (C)
Explanation:
hope this helps lol and have a great day
Answer:
honestly this is kind of an opinionanated question because some people think that the vaccine dosen't work. Like I think that, but some other people might think differently so im gonna go with answer c.
Explanation:
1.what are these things made up of? 2.are there changes in these materials? 3.is it useful to the environment when these materials chage? 4.what made them useful to the environment
please help!!!
The sky is blue because blue light is scattered in the sky. What does
scattering mean?
A. dust particles are refracting light
B. dust particles are absorbing light
C. dust particles are transmitting light
D. dust particles are reflecting light
B. dust particles are absorbing light
Explanation:When light travels through a medium, it interacts with the medium and this causes the scattering of light. - Photons are absorbed by molecules in the medium, and this causes the molecules to vibrate and then re-emit the photons. ... - The scattering of light increases with frequency
Answer:
C
Explanation:
the answer is C. dust particels are reflecting light. hope this helps
What is the mass of 0.5 moles of hydrogen gas
Answer:
1G
Explanation:
A radio station has a frequency of 9.09 x 107 Hz. What is the energy of the radio waves the station emits from its radio tower?
Answer:
well it depends of the distance, but u get your frequency and u times it by a round number if im correct
Explanation:
The main difference between a suspension and a colloid is that:
1) In colloids, the solute is permanently dissolved in the solvent.
2) In suspensions the particles eventually settle to the bottom.
3) In colloids the particles eventually settle to the bottom.
Answer:
IThink
Explanation:
i think is optional 2
GIVING BRAINLY
The speed of sound waves in air is 340 m/s. Its frequency is 750 Hz. What is its wavelength ?
Answer:
wavelength is 0.77 m
Explanation:
wavelength is y is equal to FB is equal to 44 0340
What is the mass in grams of 0.0015 mol of aspirin (C9H8O4)
Answer:
116.1 g
Explanation:
Answer:
Answer is 0. 508grams I'm not sure if I'm right but it might be the answer.
Will you be my Magnesium, Silver, Nitrogen but "9.8m/s²" is silent?
Please help me here
A solution of the weak acid HA is prepared by dissolving 2.60 g of HA in 100.0 mL water. The solution is titrated, and the equivalence point is reached after 32.6 mL of 0.500 M NaOH is dispensed. Calculate the molar mass of HA.
Answer:
Dude! this is crazy but ill help
Explanation:
The answer is 76.4 milimeters
The molarity of the weak acid HA can be calculated from the volume and molarity of NaOH by which the number of moles of HA can be calculated. From the number of moles and a weight of 2.60 g, the obtained molar mass 159.50 g/mol
What is molarity?Molarity of of solution is the number of solutes per volume of solution in liters. In a titration, the product volume and molarity of the titrant is equal to the product of volume and molarity of the analyte.
The volume and molarity of NaOH is given 32.6 ml and 0.500 M. The molarity of 100 ml of weak acid HA is calculated as follows:
Molarity of HA = (32.6 ml × 0.500 M) /100 ml
= 0.163 M.
From the molarity the number of moles of HA can be calculated by multiplying molarity with volume in liter.
number of moles = molarity × volume
= 0.163 M × 0.1 L.
= 0.0163 moles.
It is given that the weight of HA is 2.60 g. Thus molar mass can find out by dividing the weight by number of moles.
molar mass of HA = 2.60 g/ 0.0163 moles
= 159.50 g/mol.
Hence, the molar mass of the weak acid HA is 159.50 g/mol.
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Question 1 of 5
An astronaut in orbit squirts water into the air in a
spacecraft. The drops form spheres in the air.
Which property of liquid water is the astronaut demonstrating?
A. High surface tension
B. Low surface tension
C. Low viscosity
D. High viscosity
Answer:
It's A
Explanation:
High Surface Tension
