Answer:
%C= 42.1
%H=6.5
%O=51.4
Explanation:
Mass%=(mass/total)× 100%
What happens to the average speed of gas molecules as the temperature increases? Why?
Answer:
Average speed increases because average kinetic energy increases.
Explanation:
Temperature is the measure of the average kinetic energy of a system. As temperature increases, so will kinetic energy. As kinetic energy increases, speed increases.
are you doing work when u are cleaning your teeth
Answer: Yes you are.
Explanation:
A deep teeth cleaning can remove a buildup of plaque and tartar on your teeth, reducing gum inflammation and improving gum health. Plaque is a sticky film that forms on teeth. It contains bacteria and develops when food particles mix with saliva. You can remove plaque, which collects on teeth daily, by brushing your teeth.
True or false: The phenolphthalein indicator changes colour close to the point of neutralization which shows the end-point of the titration.
Answer:
True
Explanation:
A titration can be defined as the experiment where the volume of known con concentration is mixed into another solution whose concentration is not known.
Most of the titration are acid-base titration. When performing titration the indicator which is used is usually phenolphthalein. The end point of the titration is the point where the indicator changes its color.
In case of acid base reaction, the end point is achieved when the phenolpthalein turns faint pink in color from transparent.
Hence, the given statement is correct, the indicator changes its color close to the end point of titration.
A bag contains 3 red marbles, 3 blue marbles and 1 green if a marble is drawing from the bag at random what is the chance of the marble being blue
Answer:
three-seventh
Explanation:
HELP!!!!
please omg
Answer:
I believe it's A. to reduce air bubbles. Tbh, it's been a while
ASAP!!!
As current flows through a system, what happens to the voltage available at each load?
Answer:
The relationship between Voltage, Current and Resistance forms the basis of Ohm's law. In a linear circuit of fixed resistance, if we increase the voltage, the current goes up, and similarly, if we decrease the voltage, the current goes down.
True or false? To prepare 20.0 mL of 2.00 M solution of hydrochloric acid from a 10.0 M stock solution, you should take 4.00 mL of the stock solution and add 20.0 mL of water.
False. To prepare 20.0 mL of 2.00 M solution of hydrochloric acid from 10.0 M stock solution, 4.0 mL of the stock solution and 16.0 mL of water would be needed.
Recall the law of diffusion that:
C1V1 = C2V2, where C1 = initial concentration, V1 = initial volume, C2 = final concentration, and V2 = final volume.
In this case, if C1 =10.0 M, V1 = ?, C2 = 2.00 M and V2 = 20.0 mL
V1 = 2 x 20/10
= 4.0 mL
Hence, 4.0 mL of the stock solution would be taken. Since the final volume is 20.0 mL, only 16.0 mL of water would need to be added and not 20.0 mL.
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The leaves of African violets develop roots and form new
plants when they are placed in water or moist soil. Any leaf
'on the African violet plant shown can produce a new
African violet plant.
Which two terms best describe this kind of reproduction?
O A. Sexual reproduction
B. Vascular reproduction
O O O O
C. Vegetative reproduction
D. Asexual reproduction
Help pls
Answer:
vegetative reproduction and asexual reproduction
Explanation:
Answer:
Asexual and vegetation reproduction
Explanation:
just help frllllllllllllllllllllllllllllllllllll
Answer: 2 The Proximity toward the ocean
Explanation:
May i plz have brainiest
How many grams are in 26 moles of
magnesium hydroxide?
1,516.31168 grams of Magnesium Hydroxide
Which of the following compounds, sodium bicarbonate or water, should be used to extinguish a grease fire?
Answer:Douse the fire with baking soda: The chemical compound sodium bicarbonate, commonly called baking soda, is effective for extinguishing this type of fire. It takes a lot of baking soda to smother a grease fire, so pour it on while the flames are still small for the greatest effect
Explanation:
The grease fire has been put down by the addition of sodium bicarbonate as the extinguisher.
Grease fire has been defined as the fire that has been started with the over heating of the cooking oil at home. The fire has been started with the burning of the flammable liquids.
Extinguishing Grease fireThe fire in the cooking oil has been controlled with the addition of the sheet over the fire and turning off the flame.
The addition of water to grease fire results in the splashing of water over the fire and the spreading, resulting in the hazardous effects.
The sodium bicarbonate or baking soda has been used to put down grease fire.
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If 3.91 moles of H2 were used, how many moles of NH3 would be made?
HELP PLEASE ASAP
N + H2 → NH3
balance the equation
2N + 3H2 → 2NH3
3H2 → 2NH3
3 : 2
3.91 ÷ 3 = 1.303 mol
1.3 × 2 = 2.606 mol
Para solucionar el ejercicio primero se debe conocer el número atómico de los elementos para determinar cuantos electrones tiene cada uno N: número atómico 7, tiene 7 electrones Nivel 1: 2 electrones Nivel 2: 5 electrones P: número atómico 15, tiene 15 electrones Nivel 1: 2 electrones Nivel 2: 8 electrones Nivel 3: 5 electrones Cl: número atómico 17, tiene 17 electrones
Answer:
El número atómico se refiere al número de protones o electrones de un átomo.
Explicación:
El número atómico se refiere a la cantidad de protones o la cantidad de electrones que giran alrededor de las capas u órbita de un átomo, por lo que el número atómico 7 representa que el átomo tiene 7 electrones o protones mientras que, por otro lado, el número atómico 17 muestra el número de electrones o protón. Solo hay dos electrones que entran en la primera órbita y en el resto de las capas tiene espacio para 8 electrones por lo que los átomos pierden o agregan electrones en su capa más externa para obtener estabilidad.
Aliyah found a tarnished silver dollar and recalled that tarnish results when metals react with oxygen or sulfur compounds in the air. She polished the silver dollar to remove the tarnish until it was shiny again. She also polished a copper bracelet and a gold ring. What physical property of these metals makes them shiny?
A. conductivity
B. ductility
C. luster
D. malleability
Answer:
C.
Explanation:
Luster
Can someone balance this equation
CH₄ + 2O₂ = CO₂ + 2H₂O
What is the mass of an atom with 8 protons, 8 electrons, and 8 neutrons?
Answer:An oxygen atom usually has 8 protons, 8 neutrons, and 8 electrons. Looking at the periodic table, oxygen has atomic number 8 and atomic weight 15.999.
Explanation:
The mass of the atom with 8 protons, 8 electrons, and 8 neutrons would be approximately 16 atomic mass units as the number of electrons has an almost negligible contribution to the mass of the atom.
What is atomic mass?It is the sum of the mass of all the protons as well as the neutrons that are present inside the nucleus.
Atomic mass = total number of protons present in the nucleus + total number of neutrons present in the nucleus of an atom,
As given in the problem we have to find the atomic mass of the atom with eight protons, eight electrons, and eight neutrons,
This given specified atom clearly represents the oxygen atom as it has eight electrons protons and neutrons each.
Thus, the atomic mass of the given atom would be 16.
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2) Why do some earthquakes cause more damage than others?
Answer:
Earthquakes are more intense the faster the planet's crust slams together, which explains why the shaking causes so much damage in some of the most populated areas around mountain chains. ... One reason for this connection is that when two plates come together quickly, the area over which an earthquake occurs is larger.Explanation:
Below are is a before and after particle diagram that shows the process of
condensation. Choose the statement below that best describes how the
particles changed in their arrangement during this process.
Attempt d
2 Minute
Before: Gas 100 C
After: Liquid 30 C
Answer:
It must first melt to become a liquid and then evaporate to become a gas
Explanation:
What happens to the limiting reactant during the course of the chemical reaction?
Answer: The limiting reactant is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.
Explanation:
^
The equation A+ BX à AX + B is the general equation for a
Answer: d
Explanation:
took the test
The nucleus of an atom is ______ charged
Answer:
The nucleus of an atom is positively charged.
Explanation:
The nucleus of an atom is positively charged because :
The nucleus is a small dense region at the center of the atom. It consists of a positive protons and neutral neutrons. so, It has an overall positive charged.
Will award brainliest! Between which two ionization energies would you expect to see the biggest jump for calcium? A. 11-12
B. 12-13
C. 13-14
D. 14-15
answer:lettter B that is answer

A solution has a pOH of 5.
What is the pH?
Classify the solution as acid, base, or neutral.
Answer:
pH is the number given to a substance of how powerful it is before 7 or beyond 7.
the solution is an acid.
Explanation:
Pls mark BRAINLIEST
Answer:
August 15, 1971
The nine sheikhdoms still had not agreed on terms of union by 1971, however, prompting Bahrain to declare itself fully independent on August 15, 197
1.A solution has a pH of 5, calculate the pOH, [H+], and [OH-]. Classify the solution as an acid, base, or neutral solution.
it's an acid
Explanation:
I hope that this helps
please ive been stuck on this one forever
Answer:
Melting-Solid-Liquid-Added
Freezing-Liquid-Solid-Removed
Vapourization-Liquid-Gas-Added
Condensation-Gas-Liquid-Removed
Sublimation-Solid-Gas-Added
Deposition-Gas-Solid-Removed
Explanation:
Please help me with this
Answer:
no se
ablar inglés losiento princesa
por que todo me sale en inglés?
Explicación?:
3. The mass percent of nitrogen in NH4Cl is *
O 16.7% nitrogen
0 25.0% nitrogen
0 26.2% nitrogen
O none of these
Answer:
None of these
Explanation:
The mass percent is 35.4% (3 s.f.)
14/4+35.5 = 14/39.5 x 100 = 35.4 (3 s.f.)
Compared with halogens, the alkali metals in the same period has
electronegativity
the same
O larger
O smaller
Write a nuclear equation for each description below.
Stronitum-84 combines with an alpha particle, creating sodium-25 and a daughter nucleus. 4 pts
Answer:
Sr-84 + He-2 -> Na-25 + Pm-61
Explanation:
Which of the following chemical equations follows the law of conservation of mass?
Answer:
The third choice
Explanation:
The law of conservation of mass tells us that the mass of the reactants and products in a chemical reaction will be equal to one another. Equations follow the law of conservation of mass when they are balanced, which means that they have the same number and type of atoms on each side.
When individual atoms are counted, the third choice has the same number and type of atoms on each side: 1 gallium, three cesium and three fluorine.
What does the reaction rate say about a reaction?
O It tells what activation energy the reaction has.
O It tells if a catalyst was used in the reaction.
It tells how quickly products will be made.
It tells what the concentration of reactants is.
Previous
Answer:
It tells how quickly products will be made.
Explanation:
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The reaction rate provides information about how quickly products will be made in a chemical reaction.
The reaction rate is a measure of how fast a chemical reaction proceeds over time. It provides information about the speed at which reactants are consumed and products are formed during a reaction. The reaction rate is typically expressed as the change in concentration of a reactant or product per unit of time.
The reaction rate is influenced by various factors such as the nature of the reactants, concentration of reactants, temperature, surface area, and the presence of catalysts. By measuring the reaction rate, scientists can gain insights into the kinetics of a reaction and understand the factors that affect its speed.
The reaction rate is particularly important because it allows us to predict and control the rate at which products are formed. It is useful in various applications, including industrial processes, pharmaceutical development, and environmental studies. By manipulating the reaction conditions, such as adjusting the concentration of reactants or introducing a catalyst, we can alter the reaction rate to achieve desired outcomes.
In summary, the reaction rate provides valuable information about the speed at which products are formed in a chemical reaction, allowing us to understand and control the kinetics of the process.
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