Answers
Answer:
B
Explanation:
A flame test is used to identify an unknown sample by its emission spectrum. The correct answer is option B.
Flame tests are used to identify the presence of certain metal ions in a sample based on the color of the flame that is produced when the sample is heated.
When a metal ion is heated in a flame, it absorbs energy from the flame and becomes excited. As the metal ion returns to its ground state, it releases energy in the form of light, which causes the flame to emit a characteristic color.
The color of the flame is specific to the metal ion that is present and can be used to identify the metal ion based on a color chart.
Therefore option B. "to identify an unknown sample by its emission spectrum" is the correct answer.
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Related Questions
John Snow studied cholera in London in the 1800s. He determine that the source of this epidemic was a contaminated well. In this example, the contaminated well was the
carrier.
host.
reservoir.
pathogen.
Answers
Answer:
C -- Reservior
Reservior -- a supply or source of something.
Apple seeds contain a compound that forms cyanide when it comes into contact with enzymes in the
digestive system. According to the CDC, a fatal dose of cyanide for humans is 1. 8mg/kg BW. You measure
2. 0mg of cyanide in a single, crushed-up apple seed. How many apple seeds would you need to ingest to
reach this level the threshold dose? Hint: Don't forget to include your body weight in kg in your calculations). (50 kg weight)
Answers
[tex]\tt \dfrac{2}{50}\times x=1.8\\\\x=\dfrac{1.8\times 50}{2}=45~apple~seeds[/tex]
the atomic number tells you the number of _______ in one atom of an element. It also tells you the number of ______ in a neutral atom of that element. The atomic number gives the "identity" of an element as well as its location on the Periodic Table. No two different elements will have the _____ atomic number.
Answers
Answer:
Protons, electrons, same in that order is the answer.
Explanation:
this has to do with the periodic table information.
Protons, electrons and the same are answers to the blanks.
What is a proton?A proton is a subatomic particle found in the nucleus of every atom.
The atomic number tells you the number of Protons in one atom of an element. It also tells you the number of electrons in a neutral atom of that element. The atomic number gives the "identity" of an element as well as its location on the Periodic Table. No two different elements will have the same atomic number.
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How many moles are in 8.30 X 10^23 molecules of KCI?
Answers
approx. 1.37 moles.
Explanation:
No. of moles = no. of given molecules/NA
No. of moles = 8.3 × 10^23 / 6.023 × 10^23
= 1.3780 moles
Answer:
No. of moles = no. of given molecules/NA
No. of moles = 8.3 × 10^23 / 6.023 × 10^23
= 1.3780 moles
Explanation:
What is the effective nuclear charge for magnesium?.
Answers
Answer: Heyo Kenji Here! Here's your answer- Mg =1s2 2s2 2p6 3s2 = [Ne]3s2, therefore magnesium has 10 core electrons from its 1s2, 2s2, 2p6 orbitals. Magnesium is element 12, so it has 12 protons and a nuclear charge of 12.
Explanation: Hope this helps!
Have a nice day!
- Kenji ^^
Imagine that a single cell below goes through four cell divisions. How many cells are produced? To find out, draw the parent cell and cells present after each division. Then write the number of cells in the space below each drawing. (Hint: the number of cells doubles with each division.)
How many cells will be present after 10 divisions?
Answers
16 cells are produced from a single parent cell after fourth division of cell.
How many cells will be present after 10 divisions?During mitosis type of cell division, one parent cell is divided into two daughter cells. In this way, in the first division two cells are produced from single parent cell, in the second division four daughter cells are produced. In the third division, 8 cells are produced from 4 parent cells and in the fourth division 16 cells are formed from 8 cells.
So we can conclude that 16 cells are produced from a single parent cell after fourth division of cell.
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Answer:
16
Explanation:
I'm doing the exact assignment we are in the same school
How many grams of potassium sulfate must be added to make 200. mL of a 0.200 M potassium sulfate solution
Answers
Answer: 6.97 g
Explanation:
Grams of potassium sulfate must be added to make 200. mL of a 0.200 M potassium sulfate solution are 6.96.
What is Molarity?Molarity of a given solution is known as the total number of moles of solute per litre of the solution. A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.
Molarity = (No. of moles of solute ÷ Volume of solution in liters)
The unit of molarity is mol L⁻¹.
Molarity is temperature dependent because as temperature changes, volume of the solution also changes.
No. of moles of solute = 0.04
Mass of potassium sulfate = 174.2 × 0.04
Mass of potassium sulfate = 6.96 grams
Therefore, Grams of potassium sulfate must be added to make 200. mL of a 0.200 M potassium sulfate solution are 6.96.
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If it is 9 am in San Francisco, is it also 9 am in New York? Why or why not?
PLEASE HURRY PLEASE
Answers
Answer:
It wouldn't be 9am in New York because San Francisco is 3 hours behind of New York
Explanation:
if you mix baking soad with vinegar what will happen DONT CHEAT will it be a cheimcal reaction or a Physical reation
Answers
Answer:
Chemical Reaction
Explanation:
because one is a base and the other is an acid. Baking soda is a basic compound called sodium bicarbonate.
How many aluminum atoms are found in 8.57 moles of aluminum?
Answers
Answer:
1.02 10 to the 23 power(or 100,000,000,000,000,000,000,000)
atoms of AL
Explanation:
ive had this question before
WILL GIVE BRAINLIEST
A balloon contains 6.5 L of helium and has a pressure of 1.5 atm. If the balloon expands to a volume of 10.0 L, what would the pressure be in the balloon?
Answers
Answer:
The pressure of the balloon is 0.98 atm
Explanation:
Using the equation P1V1 = P2V2, you can solve for the value of V2, which is 0.98 atm.
(P1V1)/P2 = V2
Plug in the numbers:
(6.5*1.5)/10.00
=0.975 atm
=.98 atm
A Fine grained texture and a Coarse grained texture.
B. How is each texture related to the cooling rate?
Please helppp!
Answers
Explanation:
Slow cool rate in coarse
Fast cool rate in fine
A student wants to test an unknown chemical solution. What test should they perform to determine whether the chemical is an acid or base?
A.
Test the solution by testing its conductivity
B.
Test the solution by increasing its temperature.
C.
Test the solution by tasting it.
D.
Test the solution's pH by using litmus paper.
Answers
Answer: D
Explanation:
The litmus paper will help determine the pH, and thus if it is an acid or a base.
2. When a person gets too cold, his or her body will begin
Shiver
until the body's temperature is back to
normal. In sentences explain why this is an example of
homeostasis.
Answers
Answer:
The body will react because your body needs warmness to survive and coldness can make you sick and even kill you.
Which of these words best describes conditions on the moon?
A - dry
B- windy
C- hot
D- rocky
E- bumpy
Answers
the conditions on the moon are most likely bumpy
You are asked to perform an experiment. When you perform the experiment you notice the vessel is warming. What type of reaction is taking place
Answers
Exothermic type of reaction is taking place because this type of reaction generates heat energy.
What is exothermic reaction?Exothermic reactions refer to those chemical reactions that produce heat energy and release that heat energy to the surrounding environment.
So we can conclude that exothermic type of reaction is taking place because this type of reaction generates heat energy.
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Which is the simplest amino acid?
Alanine
Tyrosine
Serine
Glycine
Answers
Answer:
Glycine
Explanation:
Glycine is the simplest amino acid and most commonly found in animal proteins.
Hope this helped! Have a nice day!
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Cregan is a creep!
-Jaron, King of Carthya.
What is the carbon load (g CO2 per mil fuel) of Gas
Answers
Answer:
Mass =116.16 g
Explanation:
Given data:
Moles of CF₄ = 1.32 mol
Mass of CF₄ = ?
Solution:
Molar mass of CF₄= 88 g/mol
Formula:
Number of moles = mass/ molar mass
Number of moles × molar mass = Mass
Mass = 1.32 mol × 88 g/mol
Mass =116.16 g
A toxin that binds specifically to voltage-gated sodium channels in axons would be expected to.
Answers
Hi, I hope this helped :)
classify the reaction MgCO3(s) → MgO(s) + CO2(g)
Answers
40 POINTS!! AND IF YOU DONT GET IT RIGHT IMMA REPORT YOU AND PLEASE HELP ME
Once upon a time, a mother duckling sat on her eggs with great impatience. How long would it be before they hatched? Finally, one summer day, the mother duckling watched as the eggs cracked, and her cute, yellow ducklings waddled into the world. She was filled with joy until she noticed that one egg, which was larger than all of the others, remained. After many hours, the egg cracked. A large, gray duckling emerged. The mother duck was horrified at the duckling's appearance. The mother duck's only comfort was that the ugly duckling could swim and dive under the water.
As the ugly duckling grew, many animals in the pond criticized him. His feathers were too dark, his neck was too long, and his body was too big. His fellow ducklings refused to recognize that underneath the feathers, the ugly duckling was kind, good, and gentle. The ugly duckling shed many tears because none of the other animals would play with him.
One day, the ugly duckling decided to run far away and find a place where the animals would look past his appearance and be kind and friendly. He came to a pond and sighted three beautiful swans. Their white feathers, long necks, and kind eyes made them look like royalty. The ugly duckling sighed in disappointment. He believed that the swans would never be his friends and looked down into the pond in despair. Then, his eyes opened wide, for he saw his reflection. To his great astonishment, the ugly duckling discovered that he was a beautiful, royal swan! The swans welcomed their new friend, whose lovely appearance was matched only by his kind heart. He now felt like he belonged.
Read the fairy tale The Princess and the Pea.
Once upon a time, there was a handsome prince. The prince lived with his mother and father in a luxurious castle that overlooked a valley of wildflowers and a distant forest. As the prince grew up, he began to long for a princess. However, the prince wanted to be sure that the princess was a real princess. The queen and king searched far and wide for a real princess, but the prince always found something wrong with the princesses they found.
One evening, there was a terrible storm. The wind howled, thunder shook the stone walls, and lightning filled the dark night sky. Through the pelting of the rain, there came a knock at the door. When the king opened the door, he saw a bedraggled girl, soaked to the skin and covered in mud. He ushered her into the castle so that she could warm herself by the fire.
"Why is a young servant girl like you wandering about on such a ferocious night?" queried the king.
The disheveled maiden looked at the king in disbelief. "I am a princess, come to see the prince," she explained, all the while shivering.
The king summoned his wife, the queen, for advice. The queen looked at the hideous creature in disbelief, thinking that no princess would ever allow herself to be found in such a state. She thought quickly and came up with a clever plan. The queen put a small pea at the bottom of a bed and piled twenty mattresses on top of it. When the girl arrived at the room, she had to climb a ladder to reach the top of the bed, where she collapsed in exhaustion.
Bright and early the next morning, the king and queen arrived at the girl's bedchamber. The queen asked the girl how she had slept the night before.
"Absolutely terribly!" bemoaned the maiden. "I have spent the entire night tossing and turning. I don't know whether there is something hard in the bed, or your mattresses are rocks, but my body is black and blue."
The queen and the king stared at the maiden in astonishment. Only a real princess would have such delicate skin that she could feel a pea under twenty mattresses. The queen and king brought her to the prince, who was thrilled to meet a real princess with such an independent spirit.
How do the authors use similar and different events in each fairy tale to illustrate the theme that people should not be judged based on their appearances? Use complete sentences and evidence from the text to support your answer.
Answers
Answer:
MAIN IDEA
What the authors meant is not to judge people by their looks.
_____________________________________________________________
THE UGLY DUCKLING
The ugly duckling doesn't fit with the other ducklings and grows up, to be a fabulous bird. In the beginning, he is teased because of his looks, in a quote, "As the ugly duckling grew, many animals in the pond criticized him. His feathers were too dark, his neck was too long, and his body was too big. His fellow ducklings refused to recognize that underneath the feathers, the ugly duckling was kind, good, and gentle. The ugly duckling shed many tears because none of the other animals would play with him."
Near the end, however, it states, "He believed that the swans would never be his friends and looked down into the pond in despair. Then, his eyes opened wide, for he saw his reflection. To his great astonishment, the ugly duckling discovered that he was a beautiful, royal swan! The swans welcomed their new friend, whose lovely appearance was matched only by his kind heart. He now felt like he belonged." Throughout the course of the story, the other birds' views change since now they realize how awful they felt for mistreating the ugly duckling.
_____________________________________________________________
THE PRINCESS AND THE PEA
The king and queen didn't believe that she was a princess, so they had her endure the trial of sleeping on twenty mattresses with a pea under the very bottom one. Near the beginning of the story, it states, "The disheveled maiden looked at the king in disbelief. "I am a princess, come to see the prince," she explained, all the while shivering. The king summoned his wife, the queen, for advice. The queen looked at the hideous creature in disbelief, thinking that no princess would ever allow herself to be found in such a state. She thought quickly and came up with a clever plan. The queen put a small pea at the bottom of a bed and piled twenty mattresses on top of it. When the girl arrived at the room, she had to climb a ladder to reach the top of the bed, where she collapsed in exhaustion." This is when the king and queen were in doubt that she was a princess.
However later on it stated, "Bright and early the next morning, the king and queen arrived at the girl's bed-chamber. The queen asked the girl how she had slept the night before. "Absolutely terribly!" bemoaned the maiden. "I have spent the entire night tossing and turning. I don't know whether there is something hard in the bed, or your mattresses are rocks, but my body is black and blue." The queen and the king stared at the maiden in astonishment. Only a real princess would have such delicate skin that she could feel a pea under twenty mattresses. The queen and king brought her to the prince, who was thrilled to meet a real princess with such an independent spirit." As you can see the king and queen believed that she was a princess now because they stated, "Only a real princess would have such delicate skin that she could feel a pea under twenty mattresses."
_____________________________________________________________
CONCLUSION
Both stories focus on how the main character is doubted or mistreated because of how they look, but throughout the stories, the main character proves them wrong.
Explanation:
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Empirical formula of a compound is XY2 if its empirical formula weight is equal to its vapour density calculate the molecular formula of the compound.
Answers
Explanation:
Hope it helps you!!It's #9 Pls help will give 100 points and brainiest
Answers
heating is repeated to ensure all water molecules have evaporated
Mass%
Mass of element/Mass of solution×10025/175+25×10025/200×10025/212.5%Option B
What happens to the concentration of both H3O+ and OH- ions as water is added to an acid?
Answers
Answer
adding an acid to water increases the concentration of the H3O+ ion. decrease in the concentration of the OH- ion.
Explanation/ complete answer
Adding an acid to water therefore has an effect on the concentration of both the H3O+ and OH- ions. Because it is a source of this ion, adding an acid to water increases the concentration of the H3O+ ion. Adding an acid to water, however, decreases the extent to which water dissociates. It therefore leads to a significant decrease in the concentration of the OH- ion.
According to the World Health Organization (WHO), an estimated 240 million people are chronically infected with hepatitis B. This number describes hepatitis B's
incidence.
prevalence.
mortality.
virulence.
Answers
Answer:
A -- incidence -- the occurrence, rate, or frequency of a disease, crime, or something else undesirable.
Explanation:
The form of energy from the sun can be transformed into the energy needed for a tree to grow. What types of energy occur in this transformation?
Question 5 options:
Electromagnetic - mechanical
Potential - kinetic
Light - chemical
Nuclear - thermal
Answers
The form of energy from the sun can be transformed into the energy needed for a tree to grow is light to chemical energy.
What is energy transformation?Energy transformation is a process in which one form of energy is transfered into another form without any loss of energy.
Sun provides solar energy to the earth surface and that will be used by plants and trees for the production of food to grow. So that plants will convert the solar energy means light energy into chemical energy for their use.
Hence conversion of light energy to chemical energy takes place.
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naming ions worksheet
Answers
Answer:
I used to know this stuff but I don't remember it anymore
Acids or bases can be tested by chemical_________
Answers
Answer:
acids or bases can be tested
by chemical indicators
Which type of chemical reaction occurs in c6h12 9o2 right arrow. 6co2 6h2o? synthesis combustion single replacement double replacement
Answers
Balanced chemical reaction: C₆H₁₂ + 9O₂ → 6CO₂ + 6H₂O
Answer: Combustion
Explanation: Edge
How many outer atoms and lone pairs are present in a molecule with a trigonal pyramidal shape?.
Answers
Answer:
There are three nuclei and one lone pair, so the molecular geometry is trigonal pyramidal.
Explanation: