Answer: Iodine 131 is a radioisotope with a very short half-life of 8.02 days, making it highly radioactive.
Explanation:
what is percipatation
Answer:
Water that falls from the clouds.
Explanation:
PLEASE HELP I'LL GIVE U BRAINLIEST
Answer:
files
Explanation:
i had to answer the same question
How many atoks are in each element sampke? 16.5 g Sr, 26.5 g Fe, 7.73 g Bi, 36.4 g P
Answer:
16.5gm of Sr(strontium) has 1.12 x10^23 atoms...26.5 gm of Fe(iron) has 2.84 x10^23.... 7.73 gm of Bismuth has 2.22 x10^22.....36.4gm of Phosphorus has 7.06 x10^23
Explanation:
by the formula,
Moles=[tex]\frac{no of atoms}{Avogadro's No}[/tex]
you could find moles by
Moles = given mass/atomic mass
Put the value of moles and multiply it by Avogadro's no you will get the following answers
6. How is energy transferred to the earth?I
Answer:
Energy is transferred between the earths surface and atmosphere.Energy move place to place
what is extremely lightweight and exists in a cloud orbiting the nucleus
Answer:
atomic particles
Explanation:
electrons are extremely lightweight and exist in a cloud orbiting the nucleus period the electron cloud has a radius 10,000 times greater than the nucleus according to the Los Alamos national laboratory.
What is a Physical reaction?
If I walk 10 meters down the hallway, then 2 meters into a classroom, what is my total distance walked in meters(write the number)
Answer:
12 meters
Explanation:
Elements in group 16 of the periodic table usually
Answer:
The oxygen family, also know as the chalcogens, consists of the elements found in Group 16 of the periodic table and is the main group elements.
Elements: oxygen, sulfur, selenium, tellurium and polonium.
Hope this helps! :D
Identify and give an example of at least two molecular properties that could be used to separate a substance from a mixture.
Answer:
Two molecular properties that could be used to separate a substance from a mixture are - Filtration and Chromatography .
Explanation
Molecular property -Molecular properties include the chemical properties, physical properties, and structural properties of molecules, including medicines. Typically, molecular properties do not include a chemical compound's pharmacological or biological properties.
Filtration -: Using a filter medium that allows the fluid to move through but not the solid, filtration is a method used to distinguish solids from liquids or gases. The term 'filtration' refers whether the filter is mechanical, chemical, or physical. The filtrate is considered the fluid that flows through the filter. A surface filter, which is a solid that traps solid particles, or a depth filter, which is a bed of material that traps the solid, may be the filter medium.Usually, filtration is an imperfect operation. On the feed side of the filter or embedded in the filter media, some fluid remains and some tiny solid particles make their way through the filter.
example - Filters containing fibers that trap particulates are used by many aquariums.
Chromatography -: A laboratory method for the isolation of a mixture is chromatography. The mixture is dissolved in a fluid called the mobile phase (gas, solvent, water) that carries it through a device (a column, a capillary tube, a plate, or a sheet) on which a material called the stationary phase is fixed. For the stationary step, the different constituents of the mixture have different affinities.Chromatography can be analytical or preparatory. Preparative chromatography is intended to isolate the components of a mixture for subsequent use and is therefore a method of purification. Analytical chromatography is usually conducted with smaller quantities of material and is intended to assess the presence of analytes in a mixture or to measure their relative proportions. Both are not limited to each other.
An example of chromatography is when a chemical reaction is used to separate each of the various sized molecules on a piece of paper in a liquid compound into their own pieces.
Hence , the answer is filtration and chromatography .
A science teacher heated liquid ethanol for an experiment. When he turned up the temperature, the ethanol quickly disappeared, and a strong aroma filled the room. What happened to the ethanol?
Answer:
Heating the particles in the ethanol energized them, and they escaped to fill the room as a gas
Explanation:
Ethanol reacted and bonded with the gases in the air and so after heating the ethanol ,it quickly disappeared and a strong aroma was filled in the room .
What do you mean by ethanol ?Ethanol is a primary alcohol that is ethane in which one of the hydrogens is substituted by a hydroxy group.
Ethanol is an important industrial chemical; it is used as a solvent, in the synthesis of other organic chemicals.
Ethanol produced either by fermentation or by synthesis is obtained as a dilute aqueous solution and must be concentrated by fractional distillation.
Ethanol reacted and bonded with the gases in the air and so after heating the ethanol ,it quickly disappeared and a strong aroma was filled in the room .
Learn more about ethanol ,here:
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The number of protons in an element can be found by looking at the
symbol
atomic number
O average atomic mass
O name
Answer:
atomic number if it's a answer
Answer:
I think its the average atomic mass.
Explanation:
Na + HCI → H2 + NaCl
what do you think would be a good science fair project for an 8th grade advanced class?
Answer:
maybe something about planets or the solar system and they have to make them
Explanation:
Answer:
create a rainbow of flames or build an infinty mirror
Explanation:
Structural differences between different chemicals can be represented in models of the particles. Which drawing best represents a compound?
Answer:
this is about that.
Answer:
C.
Explanation:
A chemist is studying an unknown substance. He can break it into its elemental components only by using chemical means.
Based on this observation, how should the unknown substance be classified?
impure substance
solution
mixture
pure substance
Answer:
C, Mixture
Explanation:
Answer:
the correct answer is actually D pure substance
Explanation:
Which roller coaster
car has the least potential energy due to gravity
Answer:
the roller coaster car with the least potential energy would be the one at the bottom of the roller coaster
Explanation:
Hope this helped
Explain why the gamma rays do not bend.
Use the picture to answer the question.
Name at least three physical properties of the bowling
ball.
Answer:
The physical properties is hardness shape and color, I choose hardness because I have grabbed bowling balls before and they are very hard well there could be different types of bowling balls made of different things but I have never seen one or toughed a bowling ball that is not hard. Another physical property I chose for the bowling ball was shape, The reason I chose shape was because the bowling ball is circle, the actual name for a 3-D circle is sphere. The last physical property for a bowling ball is color because mostly all bowling balls have color for example the one in the picture it is red with a little bit of pink, there is many different bowling balls that have different color different hardness but NOT different shape. That is the physical properties of a bowling ball.
Explanation:
Hope this helps everyone who needed help with this :)
The Periodic Table of elements is arranged by:
O atomic mass
O number of neutrons
O number of electrons
O atomic number
Answer:
atomic number
Explanation:
Answer:
number of electrons and number of neutrons
Which of the following is always involved in a scientific inquiry? A. conducting experiments based on scientific questions B. guessing what would happen instead of doing experiments C. knowing the correct answer before you start D. conducting surveys to ask people's opinions on various subjects
Answer:
I'm pretty sure it's a I'd its wrong I'm sorry
Answer:
developing solutions to questions through scientific research
Explanation:
Scientific inquiry involves coming up with questions based on observation and reasoning, conducting experiments based on scientific questions,and developing solutions to questions through scientific research.
What did you find out from this investigation? Be thoughtful in your answer.
Pieces of inorganic or organic materials that come from rock and are
deposited by wind, water, or ice are called...
1.weathering
2. sediment
3.erosion
4.drought
Answer:
Sediment
Explanation:
A balloon is a sphere with a radius of 5.0 m. The force of air against the walls of the balloon is 45 N.
What is the air pressure inside the balloon?
Surface area = 12.56 × radius²
1 Pa = 1 N/m²
How would one solve this? What is an easy way to remember how to solve this problem or a list of steps to solve?
Answer:
1.4 x 10^-1 Pa
Explanation:
answer is above
Science investigation skills
(I need to have 5 answers )
Answer 1.
Predict
Answer 2.
Use variable
Answer 3.
Plan and conduct investigations
Answer 4.
Draw conclusions
Answer 5.
Hypothesize
Answer 6.
Measure
Answer 7.
Classify and order
Answer 8.
Record and display data
Answer 9.
Use time and space relationships
Answer 10.
Use numbers
Answer:
Explanation:
-------Choices ---------------
Predict
Use variable
Plan and conduct investigations
Hypothesize
Measure
Classify and order
Record and display data
Use time and space relationships
Use numbers
=================
Selection:
These are in approximate order:
Hypothesize: Build an explanation of the observation. The hypothesis should be done after a thorough review of existing information. Library database searches and researcher interviews are suggested.Predict: prediction of what would happen if the explanation were correct. E.g., If an atom is homogenous and has no internal structure, then bombarding it with with neutrons will result in most neutrons going right through the atom, and none would be reflected backwards.Plan and conduct investigations: Design experiments that test the hypothesis. E.g., see if any neutrons are reflected backwards. If they are, the hypothesis needs to be changed.
Measure: Do the work. Calibrate the equipment and record everything.
Record and display data: Publish the results and conclusions for peer review. Seek other's input in order to generate general agreement that the data, procedure, and conclusions are warranted.
===
Use numbers? Nah. Not if they are not required to reach a conclusion.(e.g., the precipitate will be pink or the reaction will stink).
Use Time and Space Relationships: Yes, but only if the hypothesis depends on them.
Classify and Order: OK, especially if you are a biologist, but not always necessary.
Use variable: usually, but what and how depends on the experiment.
Blame: Place blame on the lab partner (Just kidding).
which 2 statements describe a mixture?
1. It includes atoms of different elements.
2. Its parts can be separated using physical means.
3. It can result from chemical bonding.
4. It is a pure substance.
Answer:
It's parts can be separated using physical means.It is a pure substance.43. Why is the geometric structure of a molecule
important, especially for biological molecules?
Answer:
A slight change can change the molecule’s usefulness to the cell.
Explanation:
What effects do mutations have? Check all that apply.
Answer:
A,C,E,F
Explanation:
Which statement best describes a physical change?
Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.
Answer:
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Explanation:
Answer:
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Explanation:
im smart
A basketball weighs approximately 1.35 kg. What is this mass in grams (g)?
step by step
Answer:
1350 g
Explanation: just add a 0
who Organized elements into four groups based on propertie