Answer: He is modeling the condensation process in the water cycle.
Which substances are bases? Check all that apply.
NaOH
KOH
H3BO3
NaCl
Ca(OH)2
Fe2O3
Answer:
Which substances are bases? Check all that apply.
NaOH ✔️
KOH ✔️
H3BO3
NaCl
Ca(OH)2 ✔️
Fe2O3
so (a) (b) and (e)
Explanation:
What would be the balanced chemical equation for the complete combustion of butane ( C4H10 .)
Select one:
a. 2 C4H10 + 5 CO2 --> 8 NiO2 + 5 H2O
b. 2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O
c. 2 C4H10 + 13 CO2 --> 8 O2 + 10 H2O
d. 4 C4H10 + 6 H2O --> 8 CO2 + 5 O2
The balanced chemical equation b. 2 C₄H₁₀ + 13 O₂ ⇒ 8 CO₂ + 10 H₂O
Further explanationGiven
Butane (C₄H₁₀)
Required
Balanced equation
Solution
Formula
Hydrocarbon combustion reactions (specifically alkanes)
[tex]\large {\box {\bold {C_nH _ (_2_n _ + _ 2_) + \dfrac {3n + 1} {2} O_2 \rightarrow nCO_2 + (n + 1) H_2O}}}[/tex]
In the combustion process, the compound in the reactants is Oxygen (O₂)
If the oxygen needed for combustion is sufficient (or excess) then the combustion results are in the form of CO₂ and H₂O, but if not enough, CO and H₂O will be obtained.
The only answer that contains O₂ in the reactants is option B
Two elements are studied. One has atomic number X and one has atomic number X+2. It is known that element X is a halogen. To what group does the X+2 element belong?
Answer:
Group 1 (or IA)
Explanation:
If element X is a halogen, then it belongs to the group 17 (or VIIA, under a different notation).
For each extra unit of atomic number, the group number increases by 1. That means that the X+1 element would belong to the group 18 (or VIIIA). The X+2 element would thus belong in the group 1 (or IA) one period higher (higher as in numeric value, not as in position in the periodic table).
What is the difference between a physical property and a chemical property?
Answer/Explanation:
Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change. Any characteristic that can be determined only by changing a substance's molecular structure.
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%.
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Which of the follow statements about isotopes is NOT correct?
A- Isotopes are the same element but with different masses
B- Isotopes are often used for dating artifacts and fossils
C- Isotopes have different numbers of electrons
D- Isotopes are often radioactive
Answer: B- Isotopes are often used for dating artifacts and fossils is incorrect.
Explanation: I hope that helped
Answer: C
Explanation: Edge
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.
Budeme stát na lodi s plachtou, na klidné hladině bez větru a někoho napadne foukat velkým větrákem do plachet lodi.
Answer:
english?
Explanation:
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.
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What’s different about ionic bonding and covalent bonding ? (Help I need the answer ASAP)
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:
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.
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:
Which statement below best describes the current model of the atom based on Rutherford’s gold foil experiment?
Answer:
where are the statements??
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
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.
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 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
Nitrogen has two isotopes. One has an atomic mass of 14.003 amu and a relative abundance of 99.63% while the other isotope has an atomic mass of 15.000 amu and a relative abundance of 0.37%. What is the average atomic mass for nitrogen?
Answer:
Average atomic mass = 14.0067 amu.
Explanation:
Given data:
Abundance of 1st isotope = 99.63%
Atomic mass of 1st isotope = 14.003 amu
Abundance of 2nd isotope = 0.37%
Atomic mass of 2nd isotope = 15.000 amu
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (99.63×14.003)+(0.37×15.000) /100
Average atomic mass = 1395.119 + 5.55 / 100
Average atomic mass = 1400.67 / 100
Average atomic mass = 14.0067 amu.
pls help ill give brainliest
Answer:
The could watch for a Millard reaction (if the pie is cooked enough) and an endothermic reaction (if the pie burns)
Explanation:
How many grams of water, H20 are needed if 88
grams of CO2 gas are produced?
Answer:
Explanation:
If one mole of carbon monoxide has a mass of 28.01 g and one mole of carbon dioxide has a mass of 44.01 g , it follows that the reaction produces 44.01 g of carbon dioxide for every 28.01 g of carbon monoxide.
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
88.
88.0g C3H8 x (1 mol C3H8 / 44.0g C3H8) x (4 mol H2O / 1 mol C3H8) x (18.0g H2O / 1 mol H2O) = 144g H2O.
How many moles are in 88 grams of CO2?total mass co2 is 44 mass of given co2 is 88 in such a way nom of moles we get is 2. CO2 - ATOMIC MASS - 12 + 2 x 16 = 44 .
How many grams of C2H6 are required to produce 88 grams of CO2 when it is burned in the excess of oxygen?How many grams of C2H6 are required to produce 88 grams of CO2 when it is burned in the excess of oxygen? Explanation: 1 gram mole of C2H6 = 2 gram moles of CO2. Explanation: The number of each element is equal on both sides. 9.
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Please help fast I will give brainliest if correct
Answer:
the answer you marked is correct
Explanation:
Answer:
the answer you marked is correct
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!
For the following incomplete combustion reaction, what are the coefficients necessary to balance the equation:
___ CH4 + ___ O2 → ___ CO2 + ___ H2O + ___ C + ___ CO
Select one:
a. 4,6,1,8,1,2
b. 4,8,1,2,1,6
c. 8,1,1,2,4,6
d. 6,1,8,2,1,4
Answer: A
Explanation:
what the freak help me, I will give branliest for fast answers and correct
Which equation correctly represents the ionization process?
a. element + ionization energy --> ion+1 - 1 electron
b. element + ionization energy --> ion-1 + 1 electron
c. element + ionization energy --> ion+1 - 1 electron
d. element + ionization energy --> ion+1 + 1 electron
Explanation:
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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
Which phase of matter resists compression the most?
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
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
What is the name and formula of Calcium & Antimony
Answer:
Ca3Sb2Antimony--calcium (2/3) | Ca3Sb2 - PubChem.Explanation:
I hope it's help
