Answer:
Speed = frequency x wavelength 50 cm/s = Freq x 10cm
Explanation:
What’s different about ionic bonding and covalent bonding ? (Help I need the answer ASAP)
The least active of the following five elements in the Halogen Family is
a. 53I
b. 9F
c. 85At
d. 35Br
e. 17Cl
Answer:
c
Explanation:
Answer:
C. c c. ccccccccccc
Explanation:
cccccccccc
What is the difference between the spectrum of hydrogen and the spectrum of sunlight
will mark brainliest
Answer:
The hydrogen spectrum is an important piece of evidence to show the quantized electronic structure of an atom. ... It results in the emission of electromagnetic radiation initiated by the energetically excited hydrogen atoms. The hydrogen emission spectrum comprises radiation of discrete frequencies.
The spectrum starts with red light, with a wavelength of 700 nanometers (7,000 angstroms), at the top. ... It spans the range of visible light colours, including orange and yellow and green, and ends at the bottom with blue and violet colours with a wavelength of 400 nm (4,000 angstroms).
Explanation:
Hydrogen molecules are first broken up into hydrogen atoms (hence the atomic hydrogen emission spectrum) and electrons are then promoted into higher energy levels. Suppose a particular electron is excited into the third energy level. It would tend to lose energy again by falling back down to a lower level.
The spectrum of the Sun appears as a continuous spectrum and is frequently represented as shown below. This type of spectrum is called an emission spectrum because what you are seeing is the direct radiation emitted by the source.
which statement best describes the result of meiosis?
A. it produces body cells
B. It causes alleles to deform.
C.It prevents genetic mutation
D. it produces reproductive cells.
In Latin, the word arthropod means jointed foot.
Beside jointed legs and segmented body , what other characteristic is common to arthropods?
Answer: a pair of antennae
Explanation:
1. What is the theoretical
yield of C6H5Br in this reaction when 30.0 g of C6H6
reacts with excess Br2? If the
actual yield of C6H5Br was 56.7
g,
what
is
the
percent
yield?
Answer:
The theoretical yield in grams is 60.292 grams, and in moles the theoretical yield is 0.384. The percent yield is 94%.
Explanation:
The theoretical yield of bromobenzene is 60.3 grams and the percent yield of the reaction is 94.0%.
Explanation:
The percentage yield of the reaction is given by :[tex]Yield(\%)=\frac{\text{Actual or experimental yield}}{\text{Theoretcial yield}}\times 100[/tex]
Experimental yield is the amount of product produced after the carrying out the reaction practically.Theoretical yield is the amount of product calculated mathematically by using the amount of reactant.Given:
Mass of benzene = 30.0 g
The actual yield of bromobenzene = 56.7 g
To find:
Theoretical yield and percent yield of the reaction.
Solution:
Mass of benzene = 30.0 g
Moles of benzene =[tex]\frac{30.0 g}{78.11 g/mol}=0.384 mol[/tex]
[tex]C_6H_6+Br_2\rightarrow C_6H_5Br+HBr[/tex]
According to reaction, 1 mole of benzene gives 1 mole of bromobenzene, then 0.384 moles of benzene will give:
[tex]=\frac{1}{1}\times 0.384 mol=0.384 \text{mol of bromobenzene}[/tex]
Mass of 0.384 moles bromobenzene:
[tex]=0.384 mol\times 157.02g/mol=60.3 g[/tex]
The theoretical yield of bromobenzene = 60.3 g
The actual yield of bromobenzene = 56.7 g
The percent yield of the reaction:
[tex]Yield(\%)=\frac{56.7 g}{60.3 g}\times 100=94.0\%[/tex]
The theoretical yield of bromobenzene is 60.3 grams and the percent yield of the reaction is 94.0%.
Learn more about the percent yield of reaction here:
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4. Identify each substance in the following word equation as a reactant or a product
limestone heat lime + carbon dioxide.
5. What is the difference between an exothermic and endothermic reaction?
6. Sodium salicylate is made from carbon dioxide and sodium phenoxide. Identify each
of these substances as a reactant or a product.
Pllssssssssssssss
Explanation:
4. limestone heat lime + carbon dioxide
The reactants in this expression above is limestone
The products of the reaction is carbon dioxide and lime
Reactant is the species that gives the product and it is usually found on the left hand side of the expression.
The product is the substance on the right hand side of the expression that forms through the experiment.
Heat is used to facilitate the reaction.
5. An exothermic reaction is a reaction in which heat is given off.
An endothermic reaction is a reaction in which heat is absorbed in the process.
An exothermic reaction is always warmer after the reaction whereas an endothermic reaction is colder at the end of the reaction.
6. Sodium salicylate is made from carbon dioxide and sodium phenoxide.
The reactants are:
Carbon dioxide and sodium phenoxide
The product is:
Sodium salicylate
A student visits the beach during a very hot day. She steps on the sand and jumps because it is so hot.
Which type of heat transfer is demonstrated by the sand in this example?
transmission
radiation
conduction
convection
This is science but I didn't see it where it says to choose subject.
Answer:
conduction
Explanation:
because she touched it with her foot
A train travels 200 km/hr. How much distance will the train be from the station in 2.5 hours?
Answer:
500
Explanation:
200 multiplied by 2.5
Answer:
500 km
Explanation:
2x200 is 400. 0.5 of 200 is 100, 400+100=500
Which two types of chemical reactions do not always occur? What, specifically, do you need to do to see if they occur or not
Answer:
Molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. Molecules must collide with the proper orientation. A collision that meets these two criteria, and that results in a chemical reaction, is known as a successful collision or an effective collision.
What is this and please explain why it is :)
Answer:
it's A
Explanation:
It's a because you started with electricity as your source of energy and the new turn it into magnetical energy
Which statement below best describes the current model of the atom based on Rutherford’s gold foil experiment?
Answer:
where are the statements??
WILL MARK BRAINLIEST! PLEASE HELP!!
Heterogeneous mixtures for Liquid in liquid, liquid in solid, gas in gas, solids in gas.
Homogeneous mixtures for gas in solid, gas in gas, solid in gas.
Answer:Concrete is a heterogeneous mixture of an aggregate: cement, and water.
Sugar and sand form a heterogeneous mixture. If you look closely, you can identify tiny sugar crystals and particles of sand.
Ice cubes in cola form a heterogeneous mixture. The ice and soda are in two distinct phases of matter (solid and liquid).
Salt and pepper form a heterogeneous mixture.
Chocolate chip cookies are a heterogeneous mixture. If you take a bite from a cookie, you may not get the same number of chips as you get in another bite.
*Soda is considered a heterogeneous mixture. It contains water, sugar, and carbon dioxide, which forms bubbles. While the sugar, water, and flavorings may form a chemical solution, the carbon dioxide bubbles are not uniformly distributed throughout the liquid.
An example of homogenization is homogenized milk, which is processed so that the milk components are stable and don't separate.
In contrast, natural milk, while it might appear homogeneous when shaken, isn't stable and readily separates into different layers.
I hope that helped!
Determine the number of atoms in 3.54 mol Mn.
2.13x10²⁴ atoms are the number of atoms in 3.54 mol of Mn. The atom serves as the fundamental unit of chemistry.
What is atom?The smallest unit of matter that may be divided without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.
Space makes up the majority of an atom. The rest is made up of a cloud of electrons with negative charges surrounding a positive charge nucleus made up of protons and neutrons.
Number of atom = number of mole × 6.022×10²³
Number of atom = 3.54 × 6.022×10²³
= 2.13x10²⁴ atoms
Therefore, 2.13x10²⁴ atoms are the number of atoms in 3.54 mol of Mn.
To know more about atom, here:
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if you have 5235 pennies how many grams would they weigh
An empty beaker and watch glass has a mass of 120.15g. Exactly 25.00 mL of an unknown liquid was added to this beaker and the mass was found. The mass of the beaker, liquid, and cover was 145.50g. What is the density of the liquid?
Answer:
1.014g/mL
Explanation:
Given parameters:
Mass of beaker and watch glass = 120.15g
Volume of unknown liquid = 25mL
Mass of beaker + liquid + cover = 145.50g
Unknown:
Density of the liquid = ?
Solution:
Density is the mass per unit volume of a substance.
It is mathematically expressed as:
Density = [tex]\frac{mass}{volume}[/tex]
Mass of liquid = Mass of beaker + liquid + cover - Mass of beaker and watch glass
Mass of liquid = 145.50g - 120.15g = 25.35g
So;
Density = [tex]\frac{25.35}{25}[/tex] = 1.014g/mL
Budeme stát na lodi s plachtou, na klidné hladině bez větru a někoho napadne foukat velkým větrákem do plachet lodi.
Answer:
english?
Explanation:
Need help with 6th grade science homework PLZ HELP ASAP
Answer:
whaa is it
Explanation:
Answer:
There's nothing. What do you need help with?
Explanation:
I need help ASAP pls
Answer:
it should be option D
Explanation:
Because the frequency of a wave is directly proportional to the energy of a wave
What’s the answer? Lol
Answer:
its in your- your- it- your- ITS IN YOUR IMAGINATIONNNNNNNNNNNNNNNNNNNNNN
Explanation:
Answer:evaporates.
Explanation:Due to this absorption of energy the hydrogen bonds connecting water molecules to one another will break. The molecules are now in the gaseous state; this is called water vapour. The phase change from liquid to vapour is called evaporation. During evaporation a molecule of water absorbs latent heat.
how does a swamp act as a natural water treatment plant which humans should preserve
The corn crop in an area is prone to infestation by larvae from moths that feed on the cornstalks and ears of corn. The techniques used by two farmers to protect the corn crop are described below.
Technique A: Sprayed his corn crop with an insecticide. The insecticide is known to kill all honeybee, butterfly, and moth larvae.
Technique B: Used a genetically modified variety of corn. The plant produces an insecticide which selectively kills only the moth larvae as it feeds on the corn.
Which technique is likely to have less of an impact on the environment?
Technique B because it preserves the harmless insects and targets only the moth larvae
Technique A because insecticide use is better for preserving the environment
Technique B because it may help humans who consume corn to fight bacA genetically engineered corn plant is approved for agricultural use.
Technique A because it kills a broader variety of insects to protect the corn
Answer:
a
Explanation:
3. List three structures found in
plant cells that are not in ani-
mal cells. (7.1.b)
Which one of the following sodium compounds produces a gas when treated with dilute
sulphuric acid?
A sodium carbonate
B sodium chloride
С sodium fluoride
D sodium iodide
Answer:
A. Sodium in Carbonate
Explanation:
Carbon dioxide is the gas that is produced. This is achieved according to the equation below.
CaCO3+2HCl → CaCl2+CO2+H2O
What was the biggest obstacle for the theory of continental drift to overcome?
1. no answer for how the continents moved
2. Wegener wrote all his work in a language no one could read
3. land bridges had better evidence
4. there was no concrete evidence for continental drift
PICK ONE
Answer: The answer Is A: No answer for how the continents moved.
A cell is a system of parts that work together to carry out basic life processes. An animal is also a system of parts that work together to carry out basic life processes. Match each organ or organ system with the cell part that has a similar function.
Answer: the cell wall is the skeletal system
The nucleus is the brain
The mitochondria is the digestive system
The cell membrane is the skin
Explanation:
Tuliskan persamaan tetapan kesetimbangan untuk reaksi-reaksi berikut a. Fe3+(aq) + SCN– (aq) ↔ FeSCN3+(aq) b. 3Fe(s) + 4H2O(g) ↔ Fe3O4(s) + 4H2(g)
Answer:
a. [tex]K_c = \dfrac{[ FeSCN^{3+}_{(aq)}] }{[Fe^{3+}_{(aq)}] [SCN^-_{(aq)}]}[/tex]
b. [tex]K_p = \dfrac{[H_2]^4}{[H_2O]^4}[/tex]
Explanation:
Untuk semua jenis reaksi umum:
[tex]aA + bB\iff cC + dD[/tex]
Konstanta kesetimbangan [tex]K_c = \dfrac{[C]^c [D]^d}{[A]^a[B]^b}[/tex]
Dari pertanyaan yang diberikan:
a. [tex]Fe3^+_{(aq)} + SCN^-_{ (aq)} \iff FeSCN^{3+}_{(aq) }[/tex]
Konstanta kesetimbangan:
[tex]K_c = \dfrac{[ FeSCN^{3+}_{(aq)}] }{[Fe^{3+}_{(aq)}] [SCN^-_{(aq)}]}[/tex]
b. [tex]3Fe_{(s)} + 4H_2O_{(g)} \iff Fe_3O_4_{(s)} + 4H_{2(g)}[/tex]
Konstanta kesetimbangan untuk tekanan parsial [tex]K_p[/tex]
[tex]K_p = \dfrac{[H_2]^4}{[H_2O]^4}[/tex]
Karena Fe3O4 (s) hadir sebagai padatan.
En la siguiente ecuación se observa la obtención de oxígeno y cloruro de potasio a partir del clorato de potasio 2KClO3------>2KCl + 3O2 de la ecuación puede deducirse
Answer:
Ver respuesta mas abajo
Explanation:
Tu pregunta no es muy clara pero te expondré lo que se puede deducir de esa ecuación solo con esos datos.
Primero, anotemos nuevamente la ecuación:
2KClO₃ --------> 2KCl + 3O₂
Asi como está escrita la ecuación se deduce lo siguiente:
1. Es una ecuación de descomposición. Esto significa que un compuesto o molécula se descompuso o se separó, en sus moléculas o átomos elementales para producir 2 o más átomos y/o moléculas. En esta ecuación claramente vemos que el clorato de potasio, se separó en dos moléculas distintas, pero conservando sus mismos elementos, por un lado el cloruro de potasio (KCl) y por el otro oxígeno molecular. Ahora bien, una reacción de descomposición no se da por si solo; generalmente este tipo de reacciones se dan a lugar en presencia de calor o electricidad. Y esto da a lugar a la siguiente deducción.
2. Es una reacción de tipo endotérmica. Es decir, una reacción que absorbe calor para llevarse a cabo. El KClO₃ por si solo y colocado en un simple beaker o recipiente cualquiera no se va a descomponer, si no tiene influencia de algún tipo de catalizador o agente externo que permita su descomposición. En ese sentido, el calor o la electricidad son dos agentes que influyen mucho en la descomposición de este compuesto, y al usar el calor como agente para que la reacción ocurra, el compuesto lo absorbe y se descompone. Por ende es una reacción endotérmica.
3. El radio de moles entre reactivo y un producto es el mismo. En este caso podemos observar como 2 moles de reactivo inicial (KClO₃) se descompone y genera otros 2 moles de producto, en este caso, KCl, lo que significa que el radio molar entre estos dos compuestos es 2:2 o 1:1, lo que significa que para efectos de calcular moles prácticos a partir de cierta masa, este dato nos puede ayudar a determinar los moles de los productos y posteriormente la masa.
Si necesitas alguna otra deducción o completar la pregunta si hace falta algo, posteala en una nueva pregunta.
Espero te ayude.
Balance the Chemical Equations
MgF2 + Li2CO3---> MgCO3 + LiF
Please Help
Answer:
see explanation
Explanation:
Given: MgF₂ + Li₂CO₃ => MgCO₃ + 2LiF
simple balance ... just add coefficient of '2' before LiF
Which of the following atom(s) always exists in pairs (never alone) and is considered a
diatomic molecule? Choose all that apply.
Answer:
Diatomic molecules consist of two atoms bonded together. In contrast, monatomic elements consist of single atoms (e.g., Ar, He). Many compounds are diatomic, such as HCl, NaCl, and KBr. Diatomic compounds consist of two different elements. There are seven pure elements that form diatomic molecules.
