Answer:
radio and sound
Explanation:
Because they are waves in motion
Valence electrons are important when drawing molecular structures because
a. They are closest to the nucleus of the atom and do not participate in chemical
bonding
b. They are closest to the nucleus of the atom and participate in chemical
bonding
c. They are farthest away from the nucleus of the atom and do not participate in
chemical bonding
d. They are farthest away from the nucleus of the atom and participate in
chemical bonding
Answer:
d
Explanation:
Valence electrons are in the outermost shell. They form chemical bonds with other elements, not any other electrons. Hope this helps!
What happens to the intensity of light emitted from stars the further away the star is from us?
Answer: stars vary in their effective temperature and colour. A hot star radiates more energy per second per metre surface area than a cooler star. Does this then mean that a hot star is going to appear brighter to us than a cooler one? The answer to this actually depends on a few factors
Explanation: pa brainiest po
What is the limiting reactant in a reaction where 10.0 mol of iron is treated with 12.0 mol of bromine? The product that forms is FeBr3. First, write and balance the chemical equation. Next, calculate the moles of FeBr3 that can be made from 10.0 mol of Fe. Then calculate the moles of FeBr3 that can be made from 12.0 mol of bromine. The smaller amount of FeBr3 reveals the limiting reactant.
Answer: The limiting reagent in the reaction is bromine.
Explanation:
Limiting reagent is defined as the reagent which is completely consumed in the reaction and limits the formation of the product.
Excess reagent is defined as the reagent which is left behind after the completion of the reaction.
Given values:
Moles of iron = 10.0 moles
Moles of bromine = 12.0 moles
The chemical equation for the reaction of iron and bromine follows:
[tex]2Fe+3Br_2\rightarrow 2FeBr_3[/tex]
By the stoichiometry of the reaction:
If 3 moles of bromine reacts with 2 moles of iron
So, 12.0 moles of bromine will react with = [tex]\frac{2}{3}\times 12.0=8moles[/tex] of iron
As the given amount of iron is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.
Hence, bromine is considered a limiting reagent because it limits the formation of the product.
Thus, the limiting reagent in the reaction is bromine.
On a graph showing distance versus time, a horizontal line represents an object that is
moving at a constant speed.
increasing its speed.
decreasing its speed.
not moving at all.
Answer:
the anwser is; B: increasing its speed
what is neutralisation reaction? why is it named so? give one example.
Answer:
In chemistry, neutralization or neutralisation is a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution.Neutralization reactions are the reaction between acid and base. The products formed are water and salt. It is called so because the acid and base neutralize each other to form water and salt.Hint: The neutralization reaction is the one in which an acid reacts with an equimolar amount of base to give salt and water. The example could be a reaction between any strong acid and a base. The sodium chloride formed is a result of neutralization reaction.
Trust me mark me as brainliest trust me
_______ reach the surface first during an earthquake.
Rayleigh waves
P waves
Love waves
S waves
Different between organic fertilizer and inorganic fertilizer
Organic fertilizers are made from mined rock minerals, and natural plant and animal materials. They include ingredients like manure, guano, dried and powdered blood, ground bone, crushed shells, finely pulverized fish, phosphate rock, and wood.
Inorganic fertilizer is synthetic, comprised of minerals and synthetic chemicals. Most of the minerals in inorganic fertilizer are mined from the earth, and balanced inorganic fertilizers are high in all three macronutrients and can contain ammonium sulfate, magnesium sulfate, and potassium chloride.
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is carbon dioxide from a fire extinguisher a physical or chemical change?
Answer:
Fire is a chemical reaction between oxygen and the fuel. If you want to put out a fire, just get rid of one of those three things – fuel, oxygen or heat. ...It also prevents oxygen from reaching the fuel. Most fire extinguishers work by separating the fuel from the oxygen.
Explanation:
Answer:
It is a chemical change
Explanation:
Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points
Answer:
chlorine is larger so the symbol is <
Explanation:
6. Which of the following represent kinetic energy? *
(1 Point)
the water behind a dam
O a boulder hug from a net over a pit
a calculator falling to the floor
the string on a bow before being released
Answer:
weter
Explanation:
Which statement explains why catalysts are important for living
organisms? *
Catalysts increase the amount of product formed from limited reactants.
Catalysts cause gases to be produced at a slower rate, so cells don't burst.
Catalysts are used up during chemical reactions, so organisms must constantly make
new ones.
Catalysts allow chemical reactions to occur at temperatures at which the organism
lives.
Answer:
Catalysts allow chemical reactions to occur at temperatures at which the organism lives.
Explanation:
Catalysts are molecules that speeden the rate of chemical reaction by lowering the activation energy of the reaction. In a living system, the catalyst are ENZYMES, which help to hasten up many biochemical reactions.
Another function of catalyst in living systems is that it allows chemical reactions to occur at temperatures at which the organism lives.
What is the uses of seawater as a source of renewable energy?
Explanation:
Desalination of seawater is considered a renewable source of water, although reducing its dependence on fossil fuel energy is needed for it to be fully renewable.
Método científico: El trabajo científico se caracteriza por ser planificado, con objetivos iniciales y que habitualmente se dan en un cierto orden.1) Indica cuáles son los pasos del método científico explicando brevemente cada uno de ellos.2) Los siguientes son dos modelos : *Un estudiante pensando en la competencia, desarrolla un proyecto en el sótano de su casa. *Un grupo de personas con diferentes aptitudes cooperan para resolver un problema. ¿Cuál de ellos es mejor para el trabajo científico? ¿Por qué?
Answer:
Ver explicación
Explanation:
El método científico se refiere al patrón establecido de resolución de un problema científico. Los siguientes son pasos importantes en el método científico;
Haz una observación.
formular preguntas relevantes.
elabore una hipótesis que pueda ser probada.
Diseña un experimento.
Prueba la hipótesis usando tu diseño experimental.
Teniendo en cuenta ambos escenarios, el último caso en el que estudiantes de diferentes capacidades trabajan juntos para resolver un problema refleja mejor el método científico porque pueden hacerse preguntas entre sí y llegar a hipótesis comprobables que pueden demostrarse como verdaderas o falsas mediante experimentos.
Make a flow chart on uses of metals and non metals
you have to make flow chart with explanation
Answer:
Metals:
1. Metals are strong than non metals
2. Metals can be formed in wires, thin sheets, utensils and any other heavy meachinary for industries.
3. Metals are used for building construction and used in many other manufacturers
Non Metals:
1. Non metals are less stronger than metals.
2. Non metals can be used for manufacturing bottles, toys, bags, files etc.
3. Non metals are used in making of bottles, jars, chairs etc.
Thank you.....
Have a good day.....
Which will boil faster distilled water or salt water and why?
Answer:
The distilled water will be boiled faster as it does not contain any non - volatile solute.
- The salty water contains different non - volatile salts in it.
- Due to the presence of these salts, its vapour pressure will be decreased and boiling point will be elevated.
- So, salty water will take more time to boil.
- On the other hand, distilled water does not have any such solute and due to this its vapour pressure will not be affected.
- Hence, it will boil fast than salty water.
Detecta cuál de las siguientes fórmulas estructurales no cumple con la tetravalencia del carbono (formar cuatro enlaces)
El ejercicio completo con las formulas es el siguiente:
cuál de las siguientes fórmulas no cumple con la tetravalencia del átomo de carbono.
a. CH3-CH2-CH2-OH
b. CH3-CH=CH2
c. CH3-CH2=CH2
d. CH3-CH2-CH3
Answer:
La respuesta correcta es la opción C
Explanation:
En la formula C, podemos ver claramente que no se cumple con la tetravalencia del carbono pues al sumar el total de las valencias del carbono nos da 5
CH3 - CH2 = CH2 = Total de valencias del carbono 5
1 + 2+ 2 = 5
Para que la formula sea correcta debe eliminarse un hidrogeno quedando la formula de la siguiente manera:
CH3 - CH = CH2
1 + 1 + 2 = 4
A child sits on a partially filled balloon and decreases the volume by half. What happens to the pressure inside of the balloon?
It increases
It decreases
It stays the same
**Check for proof photos at the bottom.**
**Answers are in bold.**
__________________________________________________________
A child sits on a partially filled balloon and decreases the volume by half. What happens to the pressure inside of the balloon?
A. It increases
For the same balloon, how does the density inside the balloon change?
A. increases
A scientist takes a small, partially inflated balloon out of liquid nitrogen (at a very low temperature). As the balloon rests on the table, it begins to grow in size. Which statement(s) best explains why the balloon grows?
B. The air warms and increases particle movement. Increased particle movement leads to increased volume.
C. Increased temperature means increased volume as long as the container is flexible.
__________________________________________________________
Answer the following questions with or without using a calculator.
A balloon contains 1.00 mol helium gas at STP. What will the volume of the balloon be if the pressure increases to 2.00 atm?
✔ 11.2 L
A syringe contains 0.10 mol neon gas at STP. What volume does the syringe indicate?
✔ 2.24 L
A chemist adds 0.10 mol argon gas to the syringe. The pressure and temperature remain constant. What will be the volume on the syringe after the argon is added?
✔ 4.48 L
__________________________________________________________
Acetylene gas (C2H2) reacts with oxygen gas (O2) to produce carbon dioxide (CO2) and water vapor (H2O). How many liters of C2H2 are required to produce 75.0 L of CO2?
37.5 L
What volume of H2O is produced?
37.5 L
What volume of O2 is required?
93.8 L
When making the calculations, did you need to find the number of moles?
✔ no
Liquid carbon disulfide (CS2) reacts with 44.8 L O2 gas to produce the gases carbon dioxide (CO2) and sulfur dioxide (SO2).
What is the mass of carbon dioxide produced?
29.3 g
What is the mass of sulfur dioxide produced?
85.4 g
When making the calculations, did you need to find the number of moles?
✔ yes
__________________________________________________________
Explanation:The child is putting pressure on the balloon, and squishing particles together when he/she sits on it, thus increasing pressure. Since particles are being squished closer together, density also increases.
Inflated objects will grow in size when the air inside is hotter. This is because particles move more rapidly. An example would be bike tires being more inflated under hot conditions.
One mole of any gas at standard temperature and pressure (STP) will occupy 22.4 L. If pressure increases, the volume decreases, and vice versa. If moles decreases, so will the volume, and vice versa.
Here are photos of Edge just incase.
The pressure inside of the balloon will Increase. Hence The correct option is (A).
What is Boyle's Law ?
According to this law, the pressure (p) of a given quantity of gas varies inversely with its volume (v) at constant temperature; i.e., in equation form,
pv = k
Where K = constant.
Initial pressure = P₁Initial volume = V₁Final pressure =P₂Final volume = V₂If we consider that temperature of the gas which filled inside the balloon is constant.
We know that , at constant temperature
P₁V₁ = P₂V₂
Given that
V₂ = V₁ / 2
P₂ = P₁V₁/V₂
P₂ = P₁V₁/V₁/2
P₂ = 2P₁
Therefore, the pressure inside the balloon will become double.Hence The correct option is (A).
Learn more about Gas Law here ;
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existen mas de 10 millones de cmpuestos organicos o inorganicos
so dfhhdjdjjfjfjjdjdjdj
(04.03 MC)
The table shows the nature of the reactants and products formed in a certain type of chemical reaction.
Nature of Reactants and Products
Reactants
lonic compound + lonic compound
Products
lonic compound + lonic compound
Which of the following is true about this type of chemical reaction?
It is a single replacement reaction, and all four compounds are different.
It is a double replacement reaction, and all four compounds are different.
It is a single replacement reaction, and each compound has the same set of ions.
It is a double replacement reaction, and each compound has the same set of ions.
Answer: The given type of chemical reaction is a double replacement reaction, and each compound has the same set of ions.
Explanation:
When two different compounds chemically react with each other and their ions get exchanged with each other then it leads to the formation of two new compounds. This type of reaction is called double displacement reaction.
For example, [tex]KBr + AgNO_{3} \rightarrow KNO_{3} + AgBr(\downarrow)[/tex]
Here, both KBr and [tex]AgNO_{3}[/tex] are ionic compounds that leads to the formation of two new ionic compounds which are [tex]KNO_{3}[/tex] and AgBr.
Thus, we can conclude that the given type of chemical reaction is a double replacement reaction, and each compound has the same set of ions.
identify water resevoirs as usuable or unusuable on their current state
Newton’s Second Law of Motion: The Law of 1. __________(Inertia/Acceleration)
The acceleration of an object is 2. _____________ (directly/inversely)
proportional to the magnitude of the net force acting on it, in the
3. _____________ (same/opposite) direction as the net force, and
4. _____________ (directly/inversely) proportional to the
5. _____________ (mass/weight) of the object.
Answer:
acceleration
inversly
opposite
directly
mass
Compare the following in the three states of matter
a) inter particle space
b)inter particle force of attraction
c)particle motion
Explanation:
Anything that occupies space and has mass is called matter.
(a) Inter particle space
Solids - Atoms of a solid substance are closely packed with each other due to which there is very less or no inter particle space.Liquids - Atoms of a liquid are little loosely packed due to which there is some inter particle space.Gases - Atoms of a gas are very loosely packed due to which there is large inter particle space.(b) Inter particle force of attraction
Solids - Atoms of a solid are attached to each other by strong force of attraction.Liquids - Atoms of a liquid have slightly less force of attraction as compared to a solid substance.Gases - Atoms of a gas have Vander waal forces. Hence, there is no inter particle force of attraction between atoms of a gas.(c) Particle motion
Solids - There is low or negligible particle motion between atoms of a solid.Liquids - There is high particle motion as compared to that present in a solid.Gases - There is very high particle motion as compared to solids and liquids.I would appreciate some help please ᕕ( ᐛ )ᕗ
3KOH + FeCl3 → Fe(OH)3 + 3KCl
How many grams of KOH are needed to produce 0.500 moles of KCl?
Answer:
dont know, will let uk in 2 mins
Explanation:
Explanation:
hope this helps you to understand:)
What is the molarity if 60.4 grams of hydrochloric acid was added to 505 mL of water?
M
H - 1.0079 g/mol
Cl- 35.453 g/mol
Answer:
3.29 M
Explanation:
Molarity refers to the molar concentration of a solution and it can be calculated using the formula below:
Molarity (M) = number of moles (n) ÷ volume (V)
According to this question, the mass of HCl was given to be 60.4 grams and the volume of water as 505 mL.
Using mole = mass/molar mass to convert mass of HCl to moles
Molar mass of HCl = 1.0079 + 35.453 = 36.4609g/mol
mole = 60.4g ÷ 36.4609g/mol
mole = 1.66mol
Volume of water = 505mL = 505/1000 = 0.505L
Molarity, M = 1.66 ÷ 0.505
Molarity of HCl solution = 3.29 M
How many moles are in 243 grams of Al(OH)3?
Answer:
The answer is 78.003558.
We assume you are converting between grams Al(OH)3 and mole.
You can view more details on each measurement unit:
molecular weight of Al(OH)3 or mol
This compound is also known as Aluminium Hydroxide.
Explanation:
Q.does salt make water boil at a higher temperature?
Answer:
Yes
Explanation:
The salt increases the boiling point, meaning it make water boil at a higher temperature, and it decreases the specific heat capacity, meaning it will heat up quick.
303.8 liters volume will be occupied by 217.0 grams of methane gas at STP.
True
False
Answer:
False
Explanation:
It will occupy 271.7
ANSWER FAST
What is the relationship between Ka and Kb with Kw?
(a) The sum of Ka and Kb equals the auto-dissociation constant for water.
(b) The product of Ka and Kb equals the auto-dissociation constant for water.
(c) The quotient of Ka and Kb equals the auto-dissociation constant for water.
(d)The difference of Ka and Kb equals the auto-dissociation constant for water.
What is the term for the repeating pattern in a crystalline structure?
a) Repeating pattern
b) Base pattern
c) Unit cell
d) Primitive pattern
Answer:
Because a crystalline solid consists of repeating patterns of its components in three dimensions (a crystal lattice), we can represent the entire crystal by drawing the structure of the smallest identical units that, when stacked together, form the crystal. This basic repeating unit is called a unit cell.Aug 12, 2020
What is the pH of a solution with [H+] concentration of 1.86 x 10-5?
a.5.37 x 10-10
b.9.3
c.4.7
d.1.86 x 10-5
Answer:
4.7Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ {H}^{+} ][/tex]
From the question we have
[tex]ph = - log(1.8 \times {10}^{ - 5} ) \\ = 4.7447[/tex]
We have the final answer as
4.7Hope this helps you
