Answer:
A gas cylinder contains exactly 15 moles of oxygen gas (02)
I might honestly fail miserably on my chemistry final tomorrow. Would anyone be able to give some last-minute advice?
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the PH of a solution with a [H+] of 1x10^9 is ?
Answer:
9
Explanation:
pH = -log[H+] = -log(1x10^9) = 9
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.
¡A que clasificación corresponden las sustancias que están formadas por un mismo tipo de átomos, es homogénea y no puede descomponerse por medios químicos?
Answer:
Elementos.
Explicación:
Los elementos son las sustancias puras que están formadas por el mismo tipo de átomos, es homogéneo y no se puede descomponer por medios químicos. El elemento tiene el mismo tipo de átomos que son similares en tamaño y forma. Es un tipo de materia pura que tiene solo un tipo de átomos y no se puede descomponer más porque no está hecha de dos sustancias, es solo una sustancia, por eso no se puede descomponer por medios químicos.
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.
Un gas ocupa un volumen de 358L a 152°C y 470 mmHg ¿Qué volumen ocupara el gas, si la temperatura aumente a 500 K y 6 atm?
Answer:
42 L
Explanation:
de los parámetros en la pregunta;
V1 = 358L
T1 = 152 ° C + 273 = 425 K
P1 = 470 mmHg × 1 atm / 760 mmHg = 0.6atm
V2 =?
P2 = 6 atmósferas
T2 = 500 K
P1V1 / T1 = P2V2 / T2
P1V1T2 = P2V2T1
V2 = P1V1T2 / P2T1
V2 = 0,6 × 358 × 500/6 × 425
V2 = 107400/2550
V2 = 42 L
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:
Describe the method to make pure, dry crystals of magnesium sulfate from a metal oxide and dilute acid.
Answer:
H2SO4(aq) + MgO(s) → H2O(l) + MgSO4(aq)
Explanation:
We must recall that the oxides of metals are bases. These metal oxides can react with dilute acids to yield salt and water.
Bearing that in mind, we want to obtain magnesium sulfate from a metal oxide and dilute acid.
In this case we need magnesium oxide and dilute sulphuric acid. The reaction occurs as follows;
H2SO4(aq) + MgO(s) → H2O(l) + MgSO4(aq)
4 NH3 + 7 O2 → 4 NO2 + 6 H2O What is the mole ratio between oxygen and nitrogen dioxide? 7 moles to 6 moles 4 moles to 6 moles 7 moles to 4 moles 4 moles to 4 moles
Answer:
7:4
Explanation:
O2 : NO2
7 : 4
hope this helps :)
How many grams are in 2.000 moles of Cl2
Answer:
141.8g
Explanation:
because n(cl)=m(cl)/M(cl)
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
You are given 3 unknown solutions with pH value as 6, 8 & 9.5 respectively. Which solution will contain maximum OH ion
URGENT !!!
Which of the following pairs lists a substance that can neutralize Ca(OH)2 and the salt that would be produced from the reaction? (3 points)
HCl and CaCl2
HClO and CaHClO
H2O and Ca(OH)3
H3PO4 and Ca(PO3)2
HCl and CaCl2
I took the test and it wright
The correct pair that lists a substance that can neutralize [tex]\rm Ca(OH)_2[/tex] and the salt that would be produced from the reaction is HCl and [tex]\rm CaCl_2[/tex].
A reaction is a process that involves the transformation of one or more substances into one or more different substances.
When HCl (hydrochloric acid) reacts with [tex]\rm Ca(OH)_2[/tex] (calcium hydroxide), they undergo a neutralization reaction. The HCl donates a hydrogen ion ([tex]\rm H^+[/tex]) to the [tex]\rm Ca(OH)_2[/tex], resulting in the formation of water ([tex]\rm H_2O[/tex]) and [tex]\rm CaCl_2[/tex] (calcium chloride).
The reaction can be represented as follows:
[tex]\rm 2HCl + Ca(OH)_2\rightarrow 2H_2O + CaCl_2[/tex]
Therefore, HCl is an acid that can neutralize [tex]\rm Ca(OH)_2[/tex] and the salt produced from this reaction is [tex]\rm CaCl_2[/tex].
Learn more about reaction here:
https://brainly.com/question/16737295
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How many grams of NaOH are needed to make 250mL of a 0.1M NaOH solution?
Answer:
To make 250 ml of 0.1 M NaOH, you dissolve 1 gram NaOH in enough water to make a final volume of 250 mls.
Explanation:
Your welcome! :)
Balance the equation above please
Answer:
Balanced Equation:-Al2(CO3)3. ---heat---> Al2O3 + 3 CO2
Answer:
everything can be found in the picture
Which of the following has kinetic energy?
Answer:
c ) a gymnast doing a cartwheel. ........
hope you like ☺️
whats the net ionic and total ionic equations? include the ions and states pls:
NiCl2 + Na2CO3 = 2NaCl + NiCO3
Answer:
Total ionic equation = Ni²⁺ + 2Cl⁻¹ + 2Na⁺ + CO₃⁻² → 2Na⁺ + 2Cl⁻¹ + NiCO₃ (s)
Net ionic equation = Ni²⁺ + CO₃⁻² → NiCO₃ (s)
NiCl₂ (aq) + Na₂CO₃ (aq) → 2NaCl (aq) + NiCO₃ (s)
First, we'll need to expand the complete chemical equation into a total ionic equation (to determine whether a chemical is aqueous or solid, use a solubility chart until the rules are memorized).
Ni²⁺ + 2Cl⁻¹ + 2Na⁺ + CO₃⁻² → 2Na⁺ + 2Cl⁻¹ + NiCO₃ (s)
Now, using the total ionic equation, we can find the net ionic equation. In order to do this, we need to cancel out the aqueous solutions that don't form into solids, as they are extraneous.
Ni²⁺ + 2Cl⁻¹ + 2Na⁺ + CO₃⁻² → 2Na⁺ + 2Cl⁻¹ + NiCO₃ (s)
Ni²⁺ + CO₃⁻² → NiCO₃ (s)
I hope this helped!
what form of energy does a glue gun produce when turned on?
_______ reach the surface first during an earthquake.
Rayleigh waves
P waves
Love waves
S waves
¿Qué tipos de contaminantes identificamos?¿cuál de ellos tiene mayor concentración de los gases?¿Qué sucedió con la calidad del aire en el inicio de la pandemia? Y como va en la esta última semana de la pandemia?
Answer:
Bueno al principio pero empeorando con el paso del tiempo.
Explicación:
La calidad del aire es buena al inicio de la pandemia y hay menos infección en el aire pero con el paso del tiempo la infección se propaga a un ritmo más rápido y la calidad del aire se contamina con la infección que infecta a más personas. La pandemia reduce su intensidad cuando la gente sigue las reglas saludables que previenen la propagación de la pandemia en esa localidad por lo que podemos decir que la última semana de pandemia tiene menor número de pacientes.
If the pH of a solution is 3, its pOH is
Explanation:
If the pH of a solution is 3, its pOH is 14-3= 11
The diagram below represents changes in the types of plants growing in the same area during four different time periods. Different types of plants
have been labeled for each time period.oo
Hardwood trees
Softwood trees
Small plants and
shrubs
Grasses
kanmummimaturday
Time
This change in plant types over time is an example of
Answer:
ecological succession
Explanation:
Answer:
ecological succession
Explanation:
I did this before
Rank them from the smallest to the largest
electrons
protons
atom
compounds
mixtures
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.
Struggling on this problem.
Answer:
4Al + 3O2 ----> 2Al2O3
Explanation:
first blank 4
second blank 3
third blank 2
I. Witch direction does the electric field point at a position directly west of a positive charge
Answer:
The answer is North
Explanation:
The direction of the field is taken to be the direction of the force it would exert on a positive test charge.
Aqueous sulfurous acid decomposes into sulfur dioxide gas and liquid water. Write a chemical equation for this reaction.
Answer:When trying to concentrate the solution by evaporation to produce waterless sulfurous acid it will decompose
Explanation:
Explanation:
here's the answer to your question
El agua de una alberca requiere de 35.8 gramos de desinfectante (NaClO), por cada 1000 L de agua para mantenerse limpia. El día de hoy el cuidador de la alberca no fue a trabajar y dejó al velador encargado de la adición de desinfectante al agua, pero al velador se le olvidó la cantidad y le agregó 65 g.
Answer:
816L adicionales para mantener la concentración
Explanation:
Cuánta agua debe adicionar el cuidador para que se mantenga la concentración del desinfectante?
El desinfectante, NaClO, idealmente debe estar en una concentración de:
35.8g / 1000L = 0.0358g/L
Como el velador agregó 65g de desinfectante, la cantidad de agua necesaria es:
65g * (1L / 0.0358g) = 1816L de agua son necesarios
Asumiendo que el velador agregó 1000L, el cuidador debe agregar:
1816L - 1000L =
816L adicionales para mantener la concentraciónYou are a NASCAR pit crew member. Your employer is leading the race with 20 laps to go. He just finished a pit stop and has 5.0 gallons of fuel in the tank. On the way out of the pits, he asks, "Am I going to have enough fuel to finish the race or am I going to have to make another pit stop?" You whip out your calculator and begin your calculations based on your knowledge of stoichiometry. Other information you know is: The car uses an average of 300.0 grams of O2 for each lap. The formula for fuel is C5H12. The fuel has a density of 700 g/gal. What do you tell the driver? (The density can be used as a conversion factor between grams and gallons)
Answer:
Since there are 3500 g of fuel left in the tank, and he needs only 1687.5 g to complete 20 laps, he has enough fuel to complete the race. I will tell the driver that he does not need to make another pit stop as he has enough fuel to complete the race.
Explanation:
Density = mass / volume
Density of fuel = 700 g/ 1 gal
Therefore, the mass of fuel in 1 gallon = 700 g
The driver has 5.0 gallons of fuel in the tank.
The mass of 5.0 gallons of fuel = 5 × 700 = 3500 g of fuel
Equation of the combustion of fuel, C₅H₁₂ is given below:
C₅H₁₂ + 8 O₂ ---> 6 H₂O + 5 CO₂
1 mole C₅H₁₂ requires 8 moles of O₂
1 mole of C₅H₁₂ has a mass = 72 g
8 moles of O₂ has a mass = 256 g
Therefore, 300 g of O₂ will require 300 × (72/256) g of C₅H₁₂ = 84.375 g of C₅H₁₂
84.375 g of fuel is used by the car per lap;
20 laps will require 20 × 84.375 g of fuel = 1687.5 g of fuel.
Since there are 3500 g of fuel left in the tank, and he needs only 1687.5 g to complete 20 laps, he has enough fuel to complete the race. I will tell the driver that he does not need to make another pit stop as he has enough fuel to complete the race.
