Answers
The flame colour produced by metal ions is due to electrons returning to lower energy levels after being excited to higher energy levels.
Cu2+ ions gives a deep green coloured flame.Na+ ions give a golden yellow-coloured flame.Li+ ions gives a red-coloured flame.Ca2+ ions gives a brick red-coloured flameWhat is a flame test?A flame test is a test used to identify metal ions in solution due to the characteristic colour the flame produces.
Flame colors are produced when the electrons in the metal ions present in the compound move between energy levels after excitation.
The difference in the colour of the flame depends on the difference in the energy levels of the electrons moving.
A solution of Cu(NO3)2 contains Cu2+ ions.
Cu2+ ions gives a deep green coloured flame.
A solution of Na2SO4 contains Na+ ions.
Na+ ions give a golden yellow-coloured flame.
A solution of Li3PO4 contains Li+ ions.
Li+ ions gives a red-coloured flame.
A solution of Ca(C2H3O2)2 contains Ca2+ ions
Ca2+ ions gives a brick red-coloured flame
Therefore, the colour of the flame produced by metal ions is due to electrons returning to lower energy levels after being excited to higher energy levels.
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Related Questions
MOS LEWIS Sand
Avanc YOUISBEB
Lewis Structure - Exceptions
A
Acellus
This Lewis structure
is an example of an
exception.
B
odd
electron
incomplete
octet
expanded
octet
Answers
Answer B
Explanation:
trust
Ammonia, NH3, is made in the direct reaction between nitrogen and hydrogen. If 280. grams of nitrogen are used,
how many grams of hydrogen are also used?
Answers
Answer:
The answer is 60 grams of hydrogen.
Explanation:
Assuming hydrogen is a non-limited substance, we can calculate the number of mols of nitrogen that are used.
Molar mass of N = 14 grams/mole
280g of N / (14 g / mol) = 20 mols of N
They react in a 1 to 3 ratio. For every 1 nitrogen atom, there are 3 hydrogen atoms.
The molar mass of hydrogen is 1 g / mol.
Because we have 20 mols of Nitrogen and we know we need three times the amount of hydrogen as we do nitrogen, there must be 60 mols of hydrogen.
60 * 1 = 60
The answer is 60 grams of hydrogen.
How many grams of Oxygen are in 152.21grams of CO2?
Answers
Answer:
5.3⋅10 - 23 g
(-23 has to be small numbers above)
According to stoichiometry and molar mass concept, there are 55.34 g of oxygen in 152.21 grams of CO₂.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.
According to stoichiometry , if 44 g of carbon dioxide has 16 g of oxygen then, 152.21 g of carbon dioxide will have 152.21×16/44=55.34 g.
Thus there are 55.34 g of oxygen in 152.21 g of CO₂.
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Identify the situations that have an unbalanced force. Check all that apply.
A- A baseball speeds up as it falls through the air.
B- A soccer ball is at rest on the ground.
C- An ice skater glides in a straight line at a constant speed.
D- A bumper car hit by another car moves off at an angle.
E- A balloon flies across the room when the air is released.
Answers
Answer:
A baseball speeds up as it falls through the air.
Yes. Forces on the balloon are unbalanced.
The balloon is speeding up, so we know that the downward force
of gravity is stronger than the upward force of air resistance.
A soccer ball is at rest on the ground.
No. The ball is not accelerating, so we know that the forces on it
are balanced.
The downward force of gravity on the ball and the upward force
of the ground are equal.
An ice skater glides in a straight line at a constant speed.
No. The skater's speed and direction are not changing, so he is not
accelerating. That tells us that the forces on him are balanced.
A bumper car hit by another car moves off at an angle.
Yes. The direction in which the car was moving changed.
That's acceleration, so we know that the forces on it are unbalanced,
at least at the moment of impact.
A balloon flies across the room when the air is released.
Yes. The balloon was not moving. But when the little nozzle was
opened, it started to zip around the room. So its speed changed.
And, as it goes bloozing around the room, its direction keeps changing too.
There's a whole lot of acceleration going on, so we know the forces on it
are unbalanced.
How many valence electrons do the noble gases possess?.
Answers
Answer:
8, they have a full valence shell
Explanation:
How many grams of iron (Fe) would be needed to generate 5.25 g of hydrogen gas (H2)?
[tex]3Fe + 4H_2O -\ \textgreater \ 4H_2 + Fe_3O_4[/tex]
A) 109 g Fe
B) 146 g Fe
C) 214 g Fe
D) 2.00 g Fe
Answers
Considering the given reaction, 109 g of Fe are needed to generate 5.25 g of H₂.
What is stoichiometry?Stoichiometry refers to the relationship between the quantities of reactants and products before, during, and following chemical reactions.
Step 1: Write the balanced equation.3 Fe + 4 H₂O ⇒ 4 H₂ + Fe₃O₄
Step 2: Calculate the mass of Fe needed to produce 5.25 g of H₂.We will consider the following relationships.
The molar mass of Fe is 55.85 g/mol.The molar ratio of Fe to H₂ is 3:4.The molar mass of H₂ is 2.02 g/mol.[tex]5.25gH_2 \times \frac{1molH_2}{2.02gH_2} \times\frac{3molFe}{4molH_2} \times\frac{55.85gFe}{1molFe} = 109gFe[/tex]
Considering the given reaction, 109 g of Fe are needed to generate 5.25 g of H₂.
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A continuation of this will have what immediate impact on the local ecosystem?
Answers
Answer:
A continuation of what?
Explanation:
Fill the chart below (23.46.haploid,diploid,gametes, body cells, reproduction, growth/healing”
Answers
Answer:
two daughter cell and chromosome produce a haploid
5 points
12. How many liters of a 4.2 Molar solution of NaCl are needed to make
352 grams of AICI3? *
O A. 0.186 liters
B. 1.86 liters
C. 18.6 liters
D. 352 liters
Answers
Moles of AlCl_3
[tex]\\ \tt\hookrightarrow \dfrac{352}{133}=2.64mol[/tex]
Now
Molarity=Moles of solute/Volume of solution in L[tex]\\ \tt\hookrightarrow 4.2=\dfrac{2.64}{V}[/tex]
[tex]\\ \tt\hookrightarrow V=0.62L[/tex]
Organic molecules are defined as chemical compounds that contain.
Answers
Organic molecules can be defined as carbon-containing molecules found in living things.
What are organic molecules?They are chemical compounds that are mainly made up of carbon atoms.
Characteristics of organic moleculesThey derive their three-dimensional configurations primarily from their carbon skeletons.A major function of these molecules in living systems is to form the structural components of cells and tissues.Therefore, we can conclude that the organic molecules are those that come from living beings, that is, they are compounds of biological origin, which contain carbon.
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what type of energy transfer occurs as a coiled spring is released
Answers
Explanation:
Hope it helps you :)
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Have a good day :)
When a coiled spring is released, the type of energy transfer that occurs is from potential energy to kinetic energy. When the spring is compressed and coiled, it stores potential energy due to the deformation of its structure.
The potential energy is in the form of elastic potential energy. As soon as the spring is released, it starts to expand, and this potential energy is converted into kinetic energy as the spring gains velocity and starts moving. At the maximum expansion (when the spring reaches its natural length), all the potential energy is converted into kinetic energy. The kinetic energy will continue to drive the motion of the spring until it comes to a stop or transfers its energy to another object or system.
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Please helppp me with this question. The question is in the pic that I have uploaded.
Answers
Both melting and evaporating take place over a range of temperatures and pressures.
:
Melting is the temperature at which molecules in a solid can move past each other and form a liquid. The boiling on the other hand involves liquids and gasses, boiling is the temperature at which the gas from the liquid is pushing the air with the same force the air is pushing back.
Hope this helps !
A chemical reaction produces 13.8 mol of CO What volume in liters will that gas occupy at STP
Answers
Answer:
309 liters
Explanation:
A wonderful constant within the gas laws states that 1 mole of any gas occupies 22.4 liters at STP. ANY gas. Make that into a conversion factor you can use at your next social gathering if you want to annoy some friends:
(22.4L/1 mole) for any gas at STP.
Use that factor to find the answer:
(13.8 moles)(22.4L/1 mole) = 309 liters
Martin works in a crime lab, and his job is to create the finished sketches of each crime scene. What does his job MOST likely entail?
A. He uses computer programs to create a detailed representation of the scene,
B. He takes video of every crime scene and turns the video into a drawing
C. He takes a rough sketch and uses his own artistic skill to draw it more clearly
D. He interviews witnesses to make sketches of possible suspects in a crime.
Answers
Answer:
C. He takes a rough sketch and uses his own artistic skill to draw it more clearly
Martin works in a crime lab, and his job is to create the finished sketches of each crime scene. So, He uses computer programs to create a detailed representation of the scene, which is option A.
Martin's job as a crime scene sketch artist most likely entails using specialized computer programs to create detailed and accurate representations of the crime scenes. These programs allow him to accurately depict the dimensions, measurements, and key features of the crime scene. It provides a more precise and professional output compared to traditional hand-drawn sketches. The correct answer is option A.
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I need an explanation on how to balance equations for mole ratio
Answers
Answer:
12. 5
11.
10
10
15. 7
14. 11
2
=
16
16
18. 3
+
11
17
3
4
co
loo
8
Step-by-step explanation:
12. 5
11.
10
10
15. 7
14. 11
Which of the following explains how one of the postulates in John Dalton's atomic theory later became robust knowledge? (5 points)
Group of answer choices
Some scientists found that some atoms of a particular element have different number of neutrons.
Various scientists found that atoms combine in simple whole number ratios to form compounds.
Some scientists found that atoms consist of subatomic particles with varying mass and charge.
Various scientists found that sometimes a fraction of an atom can take part in a chemical reaction.
Answers
The postulates in John Dalton's atomic theory which later became robust knowledge is that some scientists found that some atoms of a particular element have different number of neutrons.
What is an Element?These are substances which can't be broken down into smaller parts and consists only of atoms that all have the same numbers of protons in their nuclei.
Atoms of a particular element must have the same number of protons but can have different numbers of neutrons which makes them unique.
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Which of these is an example of Kinetic energy?
Group of answer choices
Elastic Energy
Potential Energy
Thermal Energy
Chemical Energy
Answers
Answer:
thermal energy is your correct answer mark me brainly
How many millimeters are in 251 centimeters? (1cm=10mm)
Answers
Answer: 2510
Explanation: Hope this Helps
PLEASE HELP 50 POINTSSSSSSSS AND BRAINLIESTT
17. Endothermic and exothermic reactions can also be identified through observation. What might you observe that would help you identify a reaction as endothermic or exothermic? (Remember, observations can be made with any of your five senses.) (2 pts)
Answers
Answer:
•Endothermic and exothermic reactions can also be identified through observation. What might you observe that would help you identify a reaction as endothermic or exothermic?
By comparing the energy used when bonds in the reactants are broken with the energy released when bonds in the products are formed, you can determine whether a chemical reaction releases energy or absorbs energy overall. ... Chemical reactions that absorb (or use) energy are called endothermic.
Explanation:
hope it will help you have a great day bye and Mark brainlist if the answer is correct
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#carry on learning
Answer:
○ Endothermic reaction - a chemical reaction that absorbs energy from the surrounding environment “en-“ means in – it takes heat in – feels cold
○ Exothermic reaction - a chemical reaction that releases energy into the environment “exo-“ means out – sends heat energy out – feels warm or hot
Explanation:
is the release of CO2 proof for a chemical reaction?
Answers
the sublevel d can be filled with 14 electrons
Answers
Answer:
The answer is in my attachment
Explanation:
hope this helped!
How many water molecules are removed to assemble 10 fat molecules by joining glycerol and fatty acid molecules
Answers
There is a group of 10 people who are ordering pizza. If each person gets 2 slices and each pizza has 4 slices, how many pizzas should they order? *
Answers
20/4 = 5 pizzas required
There is always some between any surfaces that are in contact with each other.
Answers
Answer:
pls brain list me :(
Explanation:
Friction. Friction
Do humans depend on photosynthesis? Explain how, why, or why not. (1 point)
Yes, but only those humans that avoid meat depend on plants that produce their own food through photosynthesis.
Yes, but only those humans that avoid meat depend on plants that produce their own food through photosynthesis.
No, humans cannot make food by photosynthesis, so they do not depend on photosynthesis for energy.
No, humans cannot make food by photosynthesis, so they do not depend on photosynthesis for energy.
Yes, all of the food consumed by humans is plants or gets energy from plants, and plants produce their own food through photosynthesis.
Yes, all of the food consumed by humans is plants or gets energy from plants, and plants produce their own food through photosynthesis.
No, humans rely on animals for food, and neither humans nor animals depend on photosynthesis for food.
No, humans rely on animals for food, and neither humans nor animals depend on photosynthesis for food.
Answers
Answer:
Third option
Explanation:
The answer is the third option or "Yes, all of the food consumed by humans is plants or gets energy from plants, and plants produce their own food through photosynthesis." Photosynthesis is the process plants use to obtain their own food. Humans do depend on photosynthesis because not only humans eat plants, but animals. Some animals are herbivores which means they only eat plants. If plants cannot create their own food using photosynthesis, then the plant dies. Neither the human nor the animal can eat that plant.
Many animals rely on plants to eat and if all plants cannot perform photosynthesis, then the animals cannot eat. Us humans eat animals which means if the plants die, the animals who eat the plants die, and then humans die. Humans heavily rely on photosynthesis, so the answer is the third option.
Hope this helps.
Yes, all of the food consumed by humans is plants or gets energy from plants, and plants produce their own food through photosynthesis. Therefore, the correct option is option C.
The light-dependent processes and the light-independent reactions, also referred to as the Calvin cycle, are the two primary stages of photosynthesis. The thylakoid membrane of the chloroplasts in plant cells is where the first stage, the light-dependent processes, take place. In this phase, the pigments chlorophyll and other chloroplast-based pigments absorb solar energy and transform it into chemical energy in the form of ATP and NADPH (nicotinamide adenine dinucleotide phosphate). These chemicals are necessary to drive the following phase of photosynthesis.
Therefore, the correct option is option C.
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how many atoms of hydrogen does 6CO2 + 6H2O have
Answers
Answer:
There are 12 atoms of hydrogen.
Explanation:
In 6H₂O there are 6 molecules of water. It has 2 hydrogens in each one. You multiply 2 by 6 and get 12 atoms of hydrogen in total.
Oxygen and chlorine gas are mixed in a container with partial pressures 5 points
of 601 mmHg and 0.739 atm, respectively. What is the total pressure inside
the container (in atm)?
Answers
Answer:
o.99
Explanation:
predict the products for the reactions and balance the equations
Answers
[tex]\bold{\huge{\blue{\underline{ Answer }}}}[/tex]
Given :-We have given equation Cacl2 + K2CO3Let's BeginWe have ,
[tex]\sf{ CaCl2 + K2CO3 \:gives \:CaCO3 + KCl }[/tex]
Let's balance it
On reactant side,
[tex]\sf{Calcium (Ca) = 1}[/tex][tex]\sf{Chlorine ( Cl = 2 }[/tex][tex]\sf{Potassium (K) = 2}[/tex][tex]\sf{Carbonate (CO3) = 1}[/tex]On product side,
[tex]\sf{Calcium (Ca) = 1}[/tex][tex]\sf{Chlorine ( Cl = 1 }[/tex][tex]\sf{Potassium (K) = 1}[/tex][tex]\sf{Carbonate (CO3) = 1}[/tex]Therefore, Balanced equation will be :-[tex]\sf{ CaCl2 + K2CO3 \:gives\: CaCO3 + 2KCl }[/tex]
The above reaction is Double displacement reaction.Double Displacement reaction :-
Double displacement reaction is a reaction in which the ions of compound on a reactant side exchanges due to the varying reactivity of elements so that they can form new products.Q1. 3000 grams of heptane is combusted with 25000 grams of oxygen. C7H16 + O2 --> CO2 + H2O a) What is the limiting reactant? b) How many grams of carbon dioxide is produced? c) How many grams of excess reactant are left? *
Answers
(a)
Heptane is the limiting factor. as O2 can be found in air.
(b)
balanced equation: C7H16 + 11 O2 --> 7 CO2 + 8 H2O
moles of O2= mass/ mr
moles of O2= 25000/32
moles of O2 = 781.25 moles
According to molar ratio:
11 : 7
moles of carbon dioxide:
(781.25/11) * 7
497.16 moles
using mass = moles * mr
mass of CO2 = 497.16 * 44 = 21875.04 g -- this is mass of CO2
SOMEONE HELP ME PLEASE
Enter answer for number 1
2:00 minutes
8:00 minutes
Answers
Based on factors affecting reaction rate , the time for colouring at cold temperature 5°C will be 8.00 minutes.
How does temperature affect rate of a reaction?The rate of a reaction increases with increase in temperature.
The increase in reaction rate is due to the increase in the kinetic energy of the molecules reacting.
A low temperature lowers reaction rate.
Thus, at cold temperature 5°C, the time for food colouring will be less than at room temperature.
Therefore, the time for colouring at cold temperature 5°C will be 8.00 minutes.
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