Answer:
D a substance that increases the rate of a reaction without being used up itself in a reaction.
Explanation:
Examples are
ammonia synthesis ==> iron
sulfuric acid manufacture ==> nitrogen(II) oxide, platinum
cracking of petroleum==> zeolites
hydrogenation of unsaturated hydrocarbons ==> nickel, platinum, or palladium
I hope it helps
Answer:
Hey there!
The correct answer would be D. "a substance that increases the rate of a reaction without being used up itself in a reaction."
Hope this helps :)
What is the correct way to represent the ionic compound sodium fluoride?
Answer: I don't know how to add a picture, so I might not explain this well.
Explanation: You put Na in the first box. Then you put F in the center of the second box because it gained one electron from Na. Then in the third box you put Na [+] because it lost one electron so it's now an cation(has a positive charge) because it lost a valence electron. In the last box you would put F [-] because it gained one electron so it's now an anion( has a negative charge) because it gained a valence electron. F now has 8 valence electrons and Na has 8 as well therefore they're both balanced.
The final method of sodium fluoride is NaF. An ionic compound is formed with the aid of the complete transfer of electrons from a steel to a nonmetal and the ensuing ions have achieved an octet.
what is the ionic compound for sodium fluoride?The chemical formula of sodium fluoride is NaF and its molar mass is 41.99 g/mol. it's miles an easy ionic compound, made from the sodium (Na+) cation and fluoride (F-) anion. The strong salt exists as cubic crystals just like the crystal structure of sodium chloride (NaCl).
what is sodium fluoride?Sodium fluoride is synthetic via the response of hydrofluoric acid with sodium carbonate or sodium hydroxide with the formula NaF. The most inexpensive chemical to be had for fluoridation is sodium fluorosilicate, formerly referred to as sodium silicofluoride.
Learn more about sodium fluoride here: https://brainly.com/question/15684463
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name all the period 2 elements in mendeleevs periodic table
Answer:
beryllium, magnesium, calcium, strontium, barium, radium
Explanation:
glad to help
Below are 5 sets of potential solutes for you to compare. Both members of each pair are very soluble in water. If you had equal molar concentrations of each solution, which member of each pair would theoretically be the better conductor of electricity?
A. CsCl, CaCl2.
B. CaS, Li2S.
C. KBr, AlCl3.
D. AlCl3, MgC2.
E. KI, K2S.
Answer:
Option D. AlCl₃, MgC₂
Explanation:
We need to dissociate all the salts, to determine the i. (Van't Hoff factor).
The salt who has the highest value, will be the better conductor of electricity
CsCl → Cs⁺ + Cl⁻ i = 2
CaCl → Ca²⁺ + Cl⁻ i = 2
CaS → Ca²⁺ + S⁻² i = 2
Li₂S → 2Li⁺ + S⁻² i = 3
KBr → K⁺ + Br⁻ i = 2
AlCl₃ → Al³⁺ + 3Cl⁻ i = 4
MgC₂ → Mg²⁺ + 2C⁻ i = 3
KI → K⁺ + I⁻ i = 2
K₂S → 2K⁺ + S⁻² i = 3
The biggest i, is in pair D.
Answer:
Look at the Screenshot!!!
Explanation:
Got it right on Odessyware ;) Have a nice day!!!!!
which materials are included in the hydrosphere that are not in liquid form A. ice caps B. lakes and rivers C. rainforest and lakes D. rocks and minerals
Answer:
The correct answer is option A, that is, ice caps.
Explanation:
The part of the planet Earth covered by water or ice is known as the hydrosphere. It comprises lakes, oceans, rivers, polar ice caps, and glaciers. The polar ice caps and glaciers are the only elements of solid found in the hydrosphere.
The other options, that is, lakes and rivers are also a part of hydrosphere but they are in liquid form. While rainforest and rocks and minerals are the parts of the lithosphere, not hydrosphere.
Answer:
A. Ice Caps
Explanation:
I Got It RIght On The Test
Which of these elements have the smallest 1st ionization energy
Answer:
Ionization energy increases as you go across a period, and increases as you move up a group. So, elements with the smallest ionization energy would be at the bottom left corner of the periodic table. Examples of elements with small ionization energy: Francium (Fr), Cesium (Cs), Radium (Ra).
The ability of a material to burn (its flammability) is an indication of the materials reactivity with oxygen. Does the information you found about flammability agree with the general trend that noble gases are fairly unreactive? Explain your answer
Answer:
Yes, this theory supports the inert nature of noble gases.
Explanation:
Noble gases already attain octet state stability, by having their outer shells completely filled with electrons. This makes them unable to take part in chemical reaction (by lose, gain or sharing of electrons).
Flammability occurs when matter burns through combination with oxygen, and changes to a different substance.
I hope this explanation is clear, let me know if I can be of further assistance.
Acetic acid only partially ionizes in water. A solution contains a large quantity of acetic acid dissolved in water. How can this acid solution best be described?
Answer:
The acid solution is a concentrated solution.
Explanation:
Acetic acid is a weak acid, because it ionizes partially in water as shown below:
CH3COOH + H2O —> H3O+ + CH3COO-
A solution containing a larger quantity of acetic acid is termed concentrated solution.
This is so because a concentrated solution is a solution that contains more of the solute than the solvent.
A solute is the substance which dissolves in the solvent.
A solvent is the substance which dissolves a solute.
In this case, acetic acid is the solute and water is the solvent.
Solution is simply the combination of solute and solvent
Solution => Solute + Solvent
More solute + Less solvent => Concentrated solution
Therefore, a solution containing a higher quantity of acetic acid ( i.e the solute) in water (i.e the solvent) is called a concentrated solution.
25g ice crystals are taken in a beaker and inserted a thermo meter into it and slowly heated. Answer the following questions based on the above experiment.
a) At what temperature ice starts melting?
b) At 50 0 C is reached, what is the physical state of ice?
c) At 100 0 C is reached the boiling point of substance is not rising for some time. What is the reason for it?
d) What is the boiling point of the substance?
e) What is physical state of the substance above 100 degree C?
Answer:
a) 0°C
b) liquid
c) The energy supplied at 100°C is utilized in breaking the intermolecular forces in the liquid.
d) 100°C
e) gas
Explanation:
There are three States of matter; solid, liquid and gas. If we start heating 25g of ice in a beaker with a thermometer inserted into it, the ice will change from solid to liquid and finally to gas as the temperature increases.
At 0°C, the solid ice begins to melt and remains liquid between 0°C-100°C. This is called the liquid range of water. At 100°C, the heat supplied does not lead to further rise in temperature. The energy supplied is rather utilized in breaking the intermolecular forces in the liquid. This is known as the latent heat of vaporization. Above 100°C, the liquid is changed to vapour. Water vapour is commonly called steam.
what is a conjugate acid
THE conjugate acid, within the acid–base theory, is a chemical compound formed by the reception of a proton by a base—in other words, it is a base with a hydrogen ion added to it, as in the reverse reaction it loses a hydrogen ION.
The intake stroke of a positive displacement compressor is most similar to that of a
A. thermostatic expansion valve.
B. auxillary electric water pump.
C. one-stroke variable displacement compressor.
D. two-stroke cylinder engine.
Answer:
D. two-stroke cylinder engine.
Explanation:
Two-stroke cylinder engine: In chemistry, the term "two-stroke cylinder engine" is described as one of the types of "internal combustion engine" that tends to complete a single "power cycle" possessing two different strokes of the "piston" during a particular "crankshaft revolution".
It generally consists of two different strokes that are being often known as power or exhaust and suction stroke.
In the question above, the given statement signifies the "two-stroke cylinder engine".
I'm a scientist working on a very high-class operation in a classified area, we experienced some very strange encounters with the people we test on, like trying to bite us,attack us causing harm i think we discovered something.
Answer:
The most important first realization is to find out if the patients are deceased and their bodies are acting under an outside volition such as a virus reanimating the body through the use of the brain stem. If they are still living then they are what would be called infected if dead they are the undead naturally enough. Keep them contained as best you can but knowing scientists they will get free. When facing an infected they can die to any injuries that a normal human can they just won't react to pain so don't shoot for the head blast that thing in the chest then hit it in the head while it's down. Forget hand to hand combat or most close-ranged weapons unless absolutely necessary because close contact means exposure to fluids from the zombie they don't have to bite you to turn you. There is so much more to be said about this I recommend picking up the ZAS zombie survival book I recently got it and have not yet finished it but have learned a great deal.
Explanation:
Yes I fully understand this is not real and I simply felt like answering in a detailed manner for fun and that book is a serious recommendation.
Answer:
The most significant first acknowledgment is to see whether the patients are expired and their bodies are acting under an outside volition, for example, an infection vivifying the body using the cerebrum stem. On the off chance that they are as yet living, at that point they are what might be called tainted if dead they are the undead normally enough. Keep them contained as well as can be expected however knowing researchers they will get free. When confronting a tainted they can bite the dust to any wounds that an ordinary human can they just won't respond to torment so don't go for the head shoot that thing in the chest at that point hit it in the head while it's down. Disregard hand to hand battle or most close-extended weapons except if completely fundamental since close contact implies introduction to liquids from the zombie they don't need to nibble you to turn you. There is quite a lot more to be said about this I suggest getting the ZAS zombie endurance book I as of late got it and have not yet completed it yet have taken in a lot.
Explanation:
How does altitude affect climate patterns in a region? [Hint: relationship of altitude and temperature]
Answer:
Higher in the atmosphere temperature changes
Explanation: The tops of tall mountain might have ice or snow because it’s cooler in higher parts of the atmosphere.
Answer:
put the answers plz
Explanation:
according to Bohr atomic model
Answer:
A small positively charged nucleus surrounded by revolving negatively charged electrons in fixed orbits
Cuantos gramos de sulfato de plomo (II) se requieren para preparar 200mL una solución de esta sal a una concentración de 100 ppm. Si se toma una muestra de 30 mL de la disolución anterior y se diluye en 1000 mL de agua, ¿cuál es la concentración de la disolución?
Answer:
0.020g de sulfato de plomo se requieren
La concentración de la solución diluida es de 3ppm
Explanation:
Las partes por millón (ppm) son definidas como:
miligramos soluto / 1L solución.
Si deseas preparar una solución a 100ppm de sulfato de plomo (II) necesitas 100mg de este sulfato en 1L. En 200mL = 0.200L vas a necesitar:
0.200L × (100mg / 1L) = 20mg de sulfato de plomo (II).
Como 1000mg = 1g,
20mg × (1g / 1000mg) = 0.020g de sulfato de plomo se requieren.
Ahora, se van a tomar 30mL de esta solución y se diluirán a 1000mL. Se diluye la solución:
1000mL / 30mL = 33.33 veces.
Como la solución inicial es de 100ppm, esta dilución genera una solución de concentración:
100ppm / 33.33 = 3ppm
Which products are the same in both the copper carbonate and the calcium carbonate if they react with hydrochloric acid in different reactions (shown above
Explanation:
the carbonate and the hydrochloric acid are the same in both reactions as products
The _____ of an element is the total number of protons and neutrons in the ___ of the atom
Answer:
Mass number
Nucleus
Explanation:
The combined number of protons and neutrons is the mass number in atomic notation.
The atomic number is just the number of protons alone.
The nucleus holds both neutrons and protons.
Electrons circle around the nucleus.
Answer: atomic mass I did it
Explanation:
A scuba diver’s air tank contains oxygen, helium, and nitrogen at a total pressure of 205 atmospheres. The partial pressure of nitrogen is 143 atmospheres, and the partial pressure of helium is 41 atmospheres. What is the partial pressure of oxygen in the tank?
answer is 20
explanation: total Pressure = 205
partial pressure of N = 143
partial pressure of He = 41
total pressure = partial pressure of N + partial pressure of O + partial pressure of He
partial pressure of O = 205 - 185 = 20
Answer:
20
Explanation:
WHAT IS THE UNBALCNED EQUATION OF Methane burns in oxygen to produce carbon dioxide and water
Answer:
[tex]\boxed{CH_{4}+O_2 --> CO_2 + H_2O}[/tex]
Explanation:
Part 1: Naming compound formulas given the namesStep 1. Methane's formula is [tex]CH_4[/tex].
Step 2: Oxygen is a diatomic molecule (it exists bonded to itself for stability purposes), so by itself in chemical equations, it is written as [tex]O_2[/tex].
Step 3: Carbon dioxide is the molecular compound of one atom of carbon and two atoms of oxygen → [tex]CO_2[/tex].
Step 4: Water is the common name of the compound of two hydrogen atoms and one oxygen atom → [tex]H_2O[/tex].
Part 2: Writing the skeleton equationStep 1: Use the determined formulas for the reactants and plug them into the equation. We are told that methane burns in oxygen -- hinting at a combustion reaction. Therefore, we may infer that these are the reactants that yield the products.
Skeleton equations are written with the reactant(s) on the left -- if there are several, they are separated by an addition symbol (+).
With this information, we may begin our equation: [tex]CH_4 + O_2[/tex], where [tex]CH_4[/tex] is methane and [tex]O_2[/tex] is the diatomic molecule of oxygen.
Step 2: Use the determined formulas for the products and plug them into the equation. We are told that the methane burns in oxygen to produce carbon dioxide and water. Hence, we can separate these two as we did with the reactants.
Now, our products side of the reaction will look like this: [tex]--> CO_2 + H_2O[/tex], where [tex]CO_2[/tex] is carbon dioxide and [tex]H_2O[/tex] is water.
Step 3: Write the final equation. All you must do after determining both sides of the equation is simply push them together. Place the reactant side of the equation on the left and the product side of the equation on the right.
This gives us our final equation, [tex]\boxed{CH_4 + O_2 --> CO_2 + H_2O}[/tex].
Because the problem asks for the unbalanced equation, we do not need to take any further steps of balancing the equation.
Why does fumaric acid have a higher boiling point than maleic acid, even though they both can form hydrogen bonds?
Answer:.
Explanation:
Favorable adaptations build up in a population over many generations due to long-term environmental change. What is the most likely result of this process?
Answer:
The most likely result of this change is the mutation and modification of body parts, properties, and functions to accommodate this change.
Explanation:
When there is a long-term change in an environment, animals develop favorable adaptation over generations to cope with this change. The most likely result of this change is the mutation and modification of body parts, properties, and functions to accommodate this change. A favorable adaptation will lead to the population thriving in this environment even if others die out due to their inability to adapt to these environment. An example is the peppered moth whose black variant now exceeds its white variant due to its ability to blend well unseen on the bark of a pollution darkened tree. The adaptation was necessary to cope with the change in their habitat caused by industrialization.
Answer:
B - speciation
Explanation:
on edge plz mark brainest
Si el elemento "X" tiene 8 protones y el elemento "Y" tiene 11 protones, al reaccionar ¿Qué tipo de enlace pueden formar? Seleccione una: a. Metálico. b. Covalente puro. c. Covalente polar. d. Iónico.
Answer:
D; Iónico
Explanation:
El elemento con 8 protones es oxígeno, mientras que el elemento con 11 protones es sodio.
El sodio es un metal alcalinotérreo, mientras que el oxígeno no es un metal.
En general, cuando tenemos un elemento metálico como el sodio, que se une con uno no metálico como el oxígeno, el tipo de enlace formado como resultado de la transferencia completa de electrones desde la capa de valencia del sodio a la capa de valencia del oxígeno para completar su propia configuración de octeto se denomina enlace electrovalente o, más generalmente, enlace iónico
Water is a compound not a mixture. Justify this statement by giving two reasons.
Answer:
Water is a compound and not a mixture. The reasons are the following:
1) It is held tightly through bonds called chemical bonds which is the characteristic of compound and not mixture.
2) It cannot be separated by physical means but can be separated by chemical means.
Answer:
⇒ Water is formed from a chemical bond, the molecule cannot be separated physically. Water can be separated into hydrogen and oxygen by a chemical reaction.
⇒ Compounds are made up of different elements. Water is made up of hydrogen and oxygen, which are two different elements. Hydrogen and oxygen form a compound known as water.
the outermost shell of an atom in known as ??
Answer:
The answer is valance shell.
Valance shell is the outermost shell of an atom which contains valance electrons on it of an atom of an elements.
Hope it helps....
Smaller particles in an atom are called ____________.
Answer:
[tex]\large \boxed{\sf subatomic \ particles}[/tex]
Explanation:
The smaller particles in an atom are called subatomic particles. Subatomic particles include electrons, protons, and neutrons.
A roller coasters velocity at the top of a hill is 21mls. Two seconds later it reaches the bottom of the hill with a velocity of 36mls. What is the acceleration of the roller coasters
Answer:
7.5 m/s²
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 21 m/s
Final velocity (v) = 36 m/s
Time (t) = 2 secs
Acceleration (a) =..?
The acceleration of an object is simply defined as the rate of change of velocity of the object with time. Mathematically, it is represented as:
Acceleration (a) = (final velocity (v) – initial velocity (u)) / time (t)
a = (v – u)/t
With the above formula, we can determine the acceleration of the roller coaster as follow:
a = (v – u)/t
a = (36 – 21)/2
a = 15/2
a = 7.5 m/s²
Therefore, the acceleration of the roller coaster is 7.5 m/s².
Which of the mechanical waves below has the greatest energy?
Answer:
Blue wave.
Explanation:
The energy of a wave depends on its amplitude. A wave having more amplitude will have greatest energy while a wave having small amplitude will have least energy. The given figure shows four waves that are shown with green, orange, blue and red color. It is very clear from the figure that the amplitude of blue wave is greatest of all the wave.Hence, blue wave will have greatest energy.what is an electrolyte? the fastest answer will get bainliest.
Answer:
Electrolytes are substances which undergo chemical change when electricity is passed through them.
For the α anomer of a D-sugar, the anomeric hydroxyl in a Haworth projection Group of answer choices has an upward projection (on the same side as the terminal CH2OH group). has a downward projection (on the opposite side from the terminal CH2OH group).
Answer:
The answer is "choice 2".
Explanation:
Its glycosidic fruit juice facility would be a chromosomal hydrogen bond and an aldehyde (or acetone) team generated from the intramolecular creation of the acetals (or ketal).
Its two heterocycles created at the anomeric core from of the 2 potential stereochemical are named anomers, that's why choice "has a downward projection (from terminal CH2OH party on the opposite side)" is correct.
:3. Give the names of salts tormed when: (a) Sodium metal replaces hydrogen ions of nitric acid. (b) Calcium metal partially replaces hydrogen ion of carbonic acid. (c) Ammonium ion replaces the hydrogen ions of hydrochloric acid. (d) Potassium metal partially replaces the hydrogen on of sulphuric acid.
Answer:
A. Sodium trioxonitrate (V) or sodium nitrat, NaNO3.
B. Calcium hydrogen carbonate, CaHCO3.
C. Ammonium chloride, NH4Cl.
D. Potassium hydrogen sulphate, KHSO4.
Explanation:
A. Sodium metal replaces hydrogen ions of nitric acid.
The equation for the reaction is given below:
2Na + 2HNO3 —> 2NaNO3 + H2
The salt formed is NaNO3 with the name sodium trioxonitrate (V) or sodium nitrate.
B. Calcium metal partially replaces hydrogen ion of carbonic acid.
The equation for the reaction is given below:
2Ca + 2H2CO3 —> 2CaHCO3 + H2
The salt formed is CaHCO3 with the calcium hydrogen carbonate
C. Ammonium ion replaces the hydrogen ions of hydrochloric acid.
The equation for the reaction is given below:
NH3 + HCl —> NH4Cl
The salt formed is NH4Cl with the name ammonium chloride.
D. Potassium metal partially replaces the hydrogen on of sulphuric acid.
The equation for the reaction is given below:
2K + 2H2SO4 —> 2KHSO4 + H2
The salt formed is KHSO4 with the name potassium hydrogen sulphate.
How are the elements arranged in the modern periodic table?
O A. According to atomic number
B. According to atomic mass
C. According to the number of neutrons
O D. According to the number of electrons
Answer:
A
Explanation: