Answer:
is 2K(s)+2H2O(l)→2KOH(aq)+H2(g).
Explanation:
Answer:
pls explain better so we understand
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.
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
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
chemists use solution concentration units to
The chart below lists data on four different projects designed to restore a wetlands habitat destroyed by human activity and a recent hurricane.
The project that will be chosen will have to be low in cost, benefit the greatest number of species, and be popular with the local citizens whose taxes will sponsor it. Based on the data and the criteria given,which project will be chosen?
Answer:
Project 3.
Explanation:
Project 3's anticipated cost is 12 to 17 million dollars. It is a lower anticipated cost than Project 2 and Project 4, but higher than Project 1 by one million dollars at maximum cost anticipation. Additionally, the percentage of wildlife to benefit is 70-80%, which is second to the most wildlife to benefit which is Project 4 at 75-80%.
And finally, for community support for Project 3 - the chart lists it as high. This outclasses Project 2 and Project 4, but balances with Project 1. However, Project 1 costs 13 to 16 million dollars and only benefits 15-25% of wildlife.
Which of the following is a compound? *
A. aluminum
B. carbon
C. oxygen
D. sugar
Answer:
C. OXYGEN
Explanation:
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:
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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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
What does the “2” in H2 represent?
Answer:
Chemical Formulas If we want to represent two atoms of hydrogen, instead of writing H H, we write H2. The subscript "2" means that two atoms of the element hydrogen have joined together to form a molecule.
Answer:
the number of that type molecule there is..
like H²O is
Hx2
Ox1
Two hydrogen one Oxygen,
or in other words, water!!
Explanation:
Calculate the number of moles in 400g of Tio2
Answer:
5.01 moles
Explanation:
Calculate the number of moles in 400g of Tio2
first, write the formulas correctly
Calculate the number of moles in 400g of TiO2
capitalize the first letter of your elements
the molar mass of TiO2 is
47.88 +2X16.00 =47.88 +32.00 = 79.88 gm/mole
(to 3 sig fig = 79.9 gm/mole
400 gm/79.9 gm/mole = 400/79.9 mole gm/gm =
400/79.9 moles = 5.01 moles
The city council of a small town wanted to add fluoride to their water so that all the residents would have healthier teeth. The mayor had read that ionic compounds must be used to get the fluoride into water. He looked up fluorine-containing compounds and came up with the following list.
NaF NF3 SiF4 CaF2 NH4F
Using academic vocabulary in paragraph form, discuss the following:
Explain which compound(s) could produce fluoride ions in the water. In your response, be sure to include:
° which of the listed compounds are ionic and which are covalent.
° how ionic and covalent compounds are different.
° why only ionic compounds would produce fluoride in water.
Answer:NaF is ionic. NF3 is covalent. SiF4 is ionic. CaF2 is Ionic and NH4F is also ionic. Ionic compounds transfer electrons whereas covalent compounds share electrons hence the word "co". Also, ionic compounds are formed with metal and nonmetal. Where a covalent is with 2 nonmetals. Only ionic compounds would produce fluoride in water because ionic compounds can dissolve in water and covalent compounds cant.
The compounds that can be used for the release of fluorine in water are NaF, [tex]\rm SiF_4[/tex], [tex]\rm CaF_2[/tex], and [tex]\rm NH_4F[/tex].
The ionic compounds are formed by the transfer of electrons between the atoms of the compounds. The ionic bonds are weaker and are easy to dissociate in the aqueous solution.
The covalent compounds are formed by the sharing of electrons between the atoms. Since there is sharing, there has been a strong bond, that has been hard to dissociate.
The Mayor has to release Fluoride in the water, thus ionic compounds are preferred that have the easy release of fluorine.
From the given compounds:
NaF = Ionic compound[tex]\rm NF_3[/tex] = Covalent compound[tex]\rm SiF_4[/tex] = Ionic compound[tex]\rm CaF_2[/tex] = Ionic compound[tex]\rm NH_4F[/tex] = Ionic compoundThus the compounds that can be used for the release of fluorine in water are NaF, [tex]\rm SiF_4[/tex], [tex]\rm CaF_2[/tex], and [tex]\rm NH_4F[/tex].
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Which of these is a ball and stick model?
C subscript 2 H subscript 4.
2 overlapping large black spheres each with 2 small blue spheres overlapping it.
2 medium sized black spheres connected by 2 grey sticks. Each black sphere has 2 small blue spheres connected to it by 1 grey stick.
2 C's connected by 2 black lines. Each C has 2 H's connected to it each by 1 black line.
The ball and stick model of C subscript 2 H subscript 4 is described as Option C: Each C has 2 H's connected to it each by 1 black.
This means the same as the 3D structure image of ethylene (C2H4) and means 2 C's connected by 2 black lines.
line.
The structure of ethylene is made up of 2 carbon atoms and 4 hydrogen atoms.
The carbon atoms are located at the middle position and the hydrogen atom surrounding the carbon atoms with two hydrogen atoms connected to each carbon atom. The two black lines connecting the carbons are the double bonds.
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Answer:
C
Explanation:
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
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."--
What is the total number of moles of solute in 0.7 liters of a 4.4 M solution of NaCl
Answer:
answer will be 3.08 mol ig.....
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
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:
describe why silver cookware tarnishes, especially in the present of sulfer-containing food such as eggs
Answer:
The result of a chemical reaction between the silver and sulfur-containing substances in the air. The silver is actually combining with sulfur and forming silver sulfide. When a thin coating of silver sulfide forms on the surface of silver, it darkens the silver.
hope u liked the answer, pls mark me as the brainliest
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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What is the mass of 0.5 moles of hydrogen gas
Answer:
1G
Explanation:
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)
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 me out !!
Will you be my Magnesium, Silver, Nitrogen but "9.8m/s²" is silent?
Please help me here
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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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
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:
Engineering chemistry
Answer:
it wont let me see it
Explanation:
