Answer:
[tex]\boxed {\boxed {\sf 75 \ radioactive \ nuclei}}[/tex]
Explanation:
Radioactive decay occurs in unstable atom nuclei. The ratio of protons to neutrons is off, causing the instability. The nuclei release particles and radiation to change into different atoms.
The half-life is the time it takes for half of the nuclei to decay. We don't know the half-life of the sample, but we know it undergoes 3 half-lives. Therefore, the number of radioactive nuclei halves every time the sample undergoes a half-life.
We can divide the number of nuclei in half 3 times to find the amount left after 3 half-lives.
1st half-life: 600/2 = 300 2nd half-life: 300/2 = 150 3rd half-life: 150/2= 75After 3 half-lives, 75 radioactive nuclei remain undecayed.
what will happen to the atoms or sbstance when it freezes
Explanation:
Freezing is the process that causes a substance to change from a liquid to a solid. Freezing occurs when the molecules of a liquid slow down enough that their attractions cause them to arrange themselves into fixed positions as a solid.
Explain the process of obtaining Crystals of sugar from hot super saturated sugar solution
Answer:
A supersaturated solution is unstable—it contains more solute (in this case, sugar) than can stay in solution—so as the temperature decreases, the sugar comes out of the solution, forming crystals. The lower the temperature, the more molecules join the sugar crystals, and that is how rock candy is created.
Answer:
A supersaturated solution is unstable—it contains more solute (in this case, sugar) than can stay in solution—so as the temperature decreases, the sugar comes out of the solution, forming crystals. The lower the temperature, the more molecules join the sugar crystals, and that is how rock candy is created.
. If 980,000 J of energy are added to 6200 g of water at 291 K, what will the final temperature of the water be? The specific heat of water is 4.18 J/(g x oC)
Answer:
Final temperature = T₂ = 328.815 K
please help me with my question
Answer:
D
Explanation:
17^0 has extra electon
Draw the expanded structural formula for the condensed formula (CH3)2CHCH2OCH2CH3 . Draw all hydrogen atoms
We have that the Complete Expanded Structure of (CH3)2CHCH2OCH2CH3 is given in the attachment below
From the Question
(CH3)2CHCH2OCH2CH3
Generally for the condensed formula (CH3)2CHCH2OCH2CH3
We consider that this is a single bond connecting them
We consider
Hydrogen H(1)
Oxygen(8)
Carbon(6)
In conclusion
The Complete Expanded Structure of (CH3)2CHCH2OCH2CH3 is given in the attachment below.
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Ethanol had a boiling point of 78.4°C. Propane has a boiling point of -42°C. Suggest why.
Answer:
Chemical compounds all have different melting points.
Explanation:
chemical compounds all have different freezing and boiling points. Different chemical compounds means they will have different chemical structures.
What are the properties of the aluminum in the can? Check all that apply.
A. It conducts electricity well.
B. It is solid.
C. It is brittle.
D. It does not react easily with water or air.
E. It is less dense than water.
Answer:it’s E cause it yeshp
A hot sun warms the surface of a lake on a calm day. What will happen to the cold water at the bottom of the lake?
A: The cold water at the bottom will rise up and mix with the warm water at the top.
B: The warm water at the top will sink down and mix with the cold water at the bottom.
C: The cold water will remain at the bottom and won't mix very much with the warm water at the top.
D: Both A and B are true.
Answer:
C:the cold water will remain at the bottom and won't mix very much with the warm water at the top because warm and cold water don't mix
Answer:
the answer is is the warm water at the top will sink down and mix with the cold water at the bottom
What is the difference between criminology and forensic science?
Criminology analyzes how crime affects the community or society as a whole, while forensic science analyzes individual crimes and evidence
O Criminology is an applied Science, while forensic science is an academic science
O Criminologists work closely with law enforcement, while forensic scientists work with academic institutions
o Criminology is a type of forensic science
Answer:
pick the second one I've done that test
Answer:
Criminology analyzes how crime affects the community or society as a whole , while forensic science analyzes individual crimes and evidence.
What are miscible liquids?
Answer:
ones that can be mixed together
Explanation:
like water or ethanol
Answer:
miscible liquids are harder to separate as they dissolve in each other
Explanation:
hope this helps!
How to separate thumb tacks and plastic beads?
How to separate color components of a leaf?
Explanation:
Add ethanol ( or whichever you choose) into the mixture.
Use a filter to separate the salt from mix.
Evaporate the ethanol/petroleum spirit -sugar mix to get the sugar by itself.
Done!
Answer: 1) a) Use a magnet, or b) add to water abd scoop off the floating plastic beads
2) Grind the leaf and solubilize what you can in water, then use filter paper as a chromatograph to separate the colors.
Explanation:
1) Look for any property between the two substances that has a large enough difference to provide an avenue for separation. Density is good, particle size also can be used, solubility, and magnetic properties, among others.
2) https://www.britannica.com/science/paper-chromatography
Is every mixture also a solution? Is every solution also a mixture? Explain.
Answer:
Not all mixtures are solutions. A solution is a specific term that describes an even or homogeneous mixture of a solute, the substance being mixed, in a solvent, the substance that is in a greater amount in which the solute dissolves. All solutions are mixtures because it is two or more substances mixed together.
What is the basic unit of all matter? O A. neutron O B. atom KDC. electron OD proton NUNE nucleus Reset Next
Answer:
Atom
Explanation:
atom: The basic unit of matter; the smallest unit of an element, having all the characteristics of that element; consists of negatively-charged electrons and a positively-charged center called a nucleus.
what is the dependent variable ?
a
b
c
????
help me lol
Answer:b and c can both be dependent variables, but im going to say that its b
Explanation:
If you go to school for 180 days each school and each day is 7 hours long, how many hours are spent in school in one school year?
Answer:
1260 hours.
Explanation:
Assuming you meant for 180 days each year, it should come out to be the answer I got. :)
180 days × 7 hours per day = 1,260 hours per year
What type of energy is stored in the nucleus of an atom
Answer:
nuclear energy
Explanation:
this holds the nucleus together
Calculate the mass of a solid metal cylinder with a density of 2.6 g/cm", a
diameter of 1.8 cm, and a length of 4 cm.
Answer:
V= π ×r² × h
V = 3.14 × (0.9)² × 4
V = 3.14 × 0.81 × 4
V = 10.1736
Mass = Volume × density
M = 10.1736 × 2.6
M = 26.45136 g
balance the following equation
Fe2O3 + CO ————> Fe + CO2
Answer:
Fe2O3 + 3CO --------> 2Fe + 3CO
1. Describe the difference between an electron and a proton in terms of their charge.
The charge of an electron is -1 while the charge of a proton is +1
Which oh these statements describes a chemical property?
A. Iron melts at 1538 C.
B. Iron is attracted to a magnet.
C. Iron is a solid at room temperature.
D. Iron rusts when exposed to air.
Iron rusts when exposed to air → chemical property
Answer:Iron rusts when exposed to air.
Explanation:Which oh these statements describes a chemical property?
A. Iron melts at 1538 C.
B. Iron is attracted to a magnet.
C. Iron is a solid at room temperature.
D. Iron rusts when exposed to air.
What molecules does a functioning human body get from food and air in its cells.?
total of 3 pts
Answer:
(glucose and amino acids) and molecules from air (oxygen) in its cells.
Explanation:
8.7351 x 10-3 to ordinary notation:
hydrogen bond is an example for? (PLEASE HELP!)
a) ion- dipole Interaction
b)dipole - dipole Interaction
c) dipole - induced dipole Interaction
d) induced dipole- induced dipole Interaction
Answer:
b)
Explanation:
hydrogen bond is a form of dipole-dipole interaction but with more unique properties
How to solve this? Pls help!!
B 1,6,4
D 2, 10,8
Question 2
Magnesium ribbon burns in awyren with the fame to produce a white sold.
magnesium oxide.
2.1 is the reaction between magnesium ribon and anyen a PHYSICAL OF CHEMICAL
change? Give a reason for the answer
2.2 Write down a balanced equation for the reaction between magnesium and oxygen
2.3 Use the law of conservation of mass to show that mass is conserved during the re
In QUESTION 2.2
Question 3
ablet, with a mass of 0.25 g contains mainly calcium carbonate
100g of radioactive mass has a half life of 5 days. Calculate the mass decayed off after 15 days
Answer:
12.5 gm
Explanation:
15 days is three half lives
100 * (1/2)^3 = 12.5 grams
which field or study (organic chemistry or inorganic chemistry) includes the study of the properties and preparation of each of the following substances?
A. Chalk
B. Aspirin (anti - pain)
C. Plastics
D. Urea
Answer:
k
Explanation:
The field which studies the properties of the substances listed is organic chemistry.
Organic chemistry refers to the study of carbon compounds. It covers the scope of all the compounds in which carbon is covalently linked to itself to form long chains.
Many of these compounds are non polar and insoluble in water. Organic chemistry limits itself to the study of other compounds which may not contain carbon. Some inorganic compounds contain carbon atoms that are not linked together to form a chain.
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Please Help!
Classify the following amine as 1°,2°, 3°, or 4° (primary, secondary, tertiary, quaternary).
Answer:
A. primary
Explanation:
Answer:
C.
Tertiary
Explanation:
10. A car gets 27 miles per gallon. How many gallons are required to drive from Sunnyvale to
Berkeley, a distance of 52 miles?
About 2 gallons. (I got 1.92592592593)
Calcula el %m/m de una solución formada por 20g de soluto en 100g de solución
Ayudaaa plizzz con desarrollo para la prueba para pasar el semestre
Por definición de porcentaje masa en masa, el porcentaje masa/masa de la solución es 20%.
En primer lugar, debes saber que una solución es una mezcla homogénea de dos o mas componentes, donde aquel que se encuentra en mayor proporción se llama solvente y las demás sustancias se denominan solutos, que están disueltas en el disolvente.
La relación que existe entre la cantidad de soluto y la cantidad de disolvente recibe el nombre de concentración.
Una de las unidades de concentración usadas es el porcentaje masa/masa. El porcentaje masa/masa (% m/m) indica la masa de soluto por masa de disolución. En otras palabras, el porcentaje en masa (o en peso) de una disolución es el número de gramos de soluto que hay por cada 100 gramos de disolución. Puede calcularse por la siguiente expresión:
[tex]Porcentaje masa en masa= \frac{masa soluto}{masa solucion}x100[/tex]
En este caso,
masa soluto= 20 gmasa solución= 100 gReemplazando en la definición de porcentaje masa/masa:
[tex]Porcentaje masa en masa= \frac{20 g}{100 g}x100[/tex]
Resolviendo:
Porcentaje masa/masa= 20%
Finalmente, el porcentaje masa/masa de la solución es 20%.
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