plzzzzzzzz helpppp

The half-life of a radioactive isotope is 2.4 minutes. If you started with 100.0 grams, how many grams would be left after 7.2 minutes has elapsed? Explain how you arrived at your answer.

Answers

Answer 1

Answer:

12.5grams would remain after time has elapsed

Plzzzzzzzz HelppppThe Half-life Of A Radioactive Isotope Is 2.4 Minutes. If You Started With 100.0 Grams,

Related Questions

which particle diagram shown above best represents the strongest intermolecular force between two ethanol, c2h6o, molecules?

Answers

The strongest intermolecular bonding in ethanol is hydrogen bonding.

Intermolecular forces are the forces that hold two molecules of a substance together in a given state of matter. For ethanol, the strongest intermolecular force is hydrogen bonding.

Hydrogen bonding occurs when hydrogen is directly linked to a highly electronegative element such as oxygen, nitrogen, fluorine or sulfur. The existence of intermolecular hydrogen bonds accounts for unusual properties such as abnormally high melting and boiling points.

Learn more about intermolecular forces: https://brainly.com/question/17111432

4. Public water supplies are unsafe in some parts of the world because the water
and
may carry

Answers

Answer:

In many parts of the world, water taken directly from wells or public supplies is not safe to drink because it may carry waterborne parasites or other diseases. The water can be sterilized by boiling it, but fuel is needed to do so.

Explanation:

Answer:  Public water supplies are unsafe in some parts of the world because the water may carry bacteria.

Explanation:

How is the polarity of a bond different from the polarity of a molecule?

Answers

Answer:

A polar bond is one where the charge distribution between the two atoms in the bond is unequal. A polar molecule is one where the charge distribution around the molecule is not symmetric. It results from having polar bonds and also a molecular structure where the bond polarities do not cancel.

Explanation:

How does electronegativity change going down and across the periodic table?

Answers

Answer:

On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Explanation:

Answer:

on the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Explanation:

hope this helps!

HELP!! Will give brainliness of answered!!
No links!!!!!!

Why does higher temperature increase the reaction rate?
Select one:
The molecules will have higher kinetic energy for higher velocity collisions.

O b. Increasing the temperature causes the reactant molecules to get hotter.

O c. The activation energy will decrease.

O d. Increasing the temperature causes the potential energy in the bonds to decrease.

Check

Answers

Answer:

a

Explanation:

Answer:

Im pretty sure it's B, almost 100% sure

Explanation:

Name one of the elements that has similar properties with helium

Answers

neon and xenon are the elements that has similar properties to helium

La superficie del sol se encuentra una temperatura de 6000 °C mientras que su núcleo tiene aproximadamente 10,000,000°C.
¿En qué parte del sol las partículas tendrán mayor velocidad?
¿Como será la velocidad de estas partículas comparada con las que están en una limonada a 5 °C?
¿que forma energía está relacionada con la velocidad en las partículas?



AYUDAAAA LO NECESITO YA

Answers

La energía cinética está relacionada con la velocidad de las partículas.

Sabemos que la velocidad de las moléculas de gas depende de la temperatura del cuerpo. La temperatura de un cuerpo es una medida de la energía cinética promedio de las moléculas del cuerpo.

Debemos notar que cuanto mayor es la temperatura del cuerpo, mayor es la velocidad de sus moléculas. Por lo tanto, a una temperatura de 10,000,000 ° C, las moléculas en el núcleo del sol tienen una velocidad mayor que las moléculas en la superficie del sol.

Todas las moléculas, ya sea en el núcleo o en la superficie del sol, se mueven a mayor velocidad que las moléculas de la limonada a una temperatura mucho más baja. La energía cinética está relacionada con la velocidad de las partículas.

Obtenga más información sobre la energía cinética: https://brainly.com/question/11067389

During an investigation, a student mixes two liquids in a beaker. The student recorded the following observations in her science notebook.

I. Both liquids are clear prior to mixing.
II. Both liquids are room temperature prior to mixing.
III. The liquid turned pink when mixed.
IV. The temperature of the liquid increased.
V. Over time, a white solid formed at the bottom of the beaker.

Required:
What are evidence of a chemical reaction?

Answers

Answer:

3, why because most of the time chemicals reacts within eachother to make new compound that's may lead the liquid chemicals to deflect some of the spectrom of light like red,yellow,blue

To solve such this we must know the concept of chemical reaction. There are so many ways to identify the chemical reaction. Therefore the correct options are option 3, 5.

What is chemical reaction?

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved that is mass can nether be created nor be destroyed in a chemical reaction.

There are so many types of chemical reaction reaction like combination reaction, double displacement reaction. The evidence of a chemical reaction are  "the liquid turned pink when mixed" and "over time, a white solid formed at the bottom of the beaker".

Therefore the correct options are option 3, 5.

Learn more about the chemical reactions, here:

brainly.com/question/3461108

#SPJ5

CH4+4S-CS2+2H2S
how many moles of CS2 can be formed by the complete reaction of 10.6 mol of S ​

Answers

Let's check the equation

[tex]\\ \sf\longmapsto {CH_4\atop 1mol}+{4S\atop 4moles}\longrightarrow {CS_2\atop 1mol}+{2H_2S\atop 2moles}[/tex]

4moles of S gives 1 mol of CS21mol of S gives 1/4=0.25mol of CS210.6mol of S gives:-

[tex]\\ \sf\longmapsto 10.6(0.25)=2.65moles\:of\:CS_2[/tex]

1. In drawing Lewis structures, a single line (single bond) between two elements represents: ? a shared electron B. ? B 2 a shared pair of electrons c. ? an octet of electrons D. ? an unshared pair of electrons​

Answers

Answer:

B a shared pair of electrons (2)

Explanation:

In Lewis structures, a single line represents a single pair of electrons. This means that the elements share 2 electrons or one pair of electrons

Hope this helps!

The shared electrons behave as if they belong to both atoms in the bond and bind the two atoms together to form a molecule. The shared electrons are typically depicted as a line (—) connecting the bonded atoms. (A line in a Lewis structure represents two electrons. Therefore, option A is correct.

What is lewis structure ?

Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, are diagrams that depict the bonding between atoms in a molecule as well as any lone pairs of electrons that may exist.

A Lewis structure is based on the octet rule, which states that atoms share electrons in order for each atom to have eight electrons in its outer shell. An oxygen atom, for example, has six electrons in its outer shell.

Gilbert N. Lewis, who introduced the Lewis structure in his 1916 article The Atom and the Molecule, was named after it. Lewis structures expand on the electron dot diagram concept by adding lines between atoms to represent shared pairs.

Thus, option A is correct.

To learn more about lewis structure, follow the link;

https://brainly.com/question/4144781

#SPJ6

5.20763 to three significant figures​

Answers

Answer:

5.21

Explanation: You can only have 3 digits, so you would round to the hundredths place

Please help me find the answer to this question

Answers

Answer:

A tumor

Explanation:

Answer:

It's Cancer

Explanation:

I did this before.

If you run a refrigerator in a closed room with the refrigerator door open,the room temperature willA) increase.B) decrease.C) remain unchanged.

Answers

Answer: A increase

Explanation: The temperature of room will increase. If a refrigerator door is open then more flow rate of coolant is required in order to maintain lower temperature So the compressor will be running continuously also heat exchange happening through condenser increases the room temperature rather than decreasing.

chemistry, giving brainliest !

Answers

the actual yield is i believe 20.03g
i may be wrong and if i am, i am extremely sorry and also sleep deprived

Answer:

20.03g

Explanation:

This is the formula for percentage yield:

Percentage yield = Actual Yield / Theoretical yield

Rearrange it to get the Actual yield, which would be:

Actual yield = Percentage yield (in decimal form) x Theoretical yield

We know that 75% of CO2 is produced as the percentage yield in a reaction and the theoretical yield for the mass we're supposed to find is 26.7 grams.

Percentage yield in decimal form: 0.75

Theoretical yield: 26.7g

Plug it in the equation

Actual yield = 0.75 x 26.7g

Actual yield = 20.03g

5 grams of sodium bicarbonate, a white powdery solid, is placed in an empty red balloon. 100 grams of acetic acid, a clear aqueous solution, is placed in the plastic bottle. The balloon is carefully attached to the bottle so that no air can get in or out and the powder does not fall into the bottle. Once attached, the apparatus is placed on a balance and the contents are mixed. Bubbles form, the balloon inflated, and the white powder is no longer visible. Which of the these statements would match your observations? A) A chemical reaction has occurred and the mass will increase. B) A chemical reaction has occurred and the mass will decrease. C) A physical reaction has occurred and the mass will decrease. D) A chemical reaction has occurred and the mass will remain the same.

Answers

Answer: im pretty sure its D

Explanation:

Draw a table with two columns labelled physical change and chemical change .Write the following changes in the correct column .

water boiling
a car rusting
petrol burning
beer fermenting
ice cream melting
wind blowing
milk turning sour
seawater evaporating
sugar dissolving in tea
food being digested
bleach cleaning a dirty cloth


Answers

Answer:

Explanation:

P = Physical Change

C = Chemical Change

water boiling                         P

a car rusting                           C

petrol burning                          C

beer fermenting                        C

ice cream melting                   P

wind blowing                               P

milk turning sour                             C

seawater evaporating                 P

sugar dissolving in tea                 P

food being digested                         C

bleach cleaning a dirty cloth                

What does one mole of h20 correspond to

Answers

Answer:

One mole of H2O corresponds to 18 g .

HELP PLEASE ASAP ILL GIVE BRAINLEST

Answers

Answer:

D

Explanation:

braineist pls???????????

Answer:

C

Explanation:

gram is bigger than atom duh

What is produced when you react a metal with oxygen?

Answers

When metal reacts with oxygen, a metal oxide forms

How many moles of CO2 are produced from 15.6 g of NaHCO3?

Answers

Answer:

0.185moles

Explanation:

1mole of bicarbonate produces 1mole of CO2

so 0.185 mole produces 0.185 moles of CO2

Potassium is a silvery-white, solid metal. Chlorine is a greenish-yellow gas. When these two elements react chemically, they yield potassium chloride which is an odorless salt with a crystal structure. Potassium chloride is used in the production of fertilizer.

Required:
Which part of atomic structure is responsible for the reactivity of atoms?

Answers

the number of electrons in the outermost shell deduces it’s reactivity

The electrons present in the valence shell of an atom are responsible for the reactivity of atoms.

What is an atom?

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

Learn more about atom,here:

https://brainly.com/question/13654549

#SPJ2

Carbon-14 emits beta radiation and decays with a half life of 5730 years. Assume you start with 2.5x10^15 grams of Carbon-14, how many grams remain at
the end of 5 half lives?
A. 1.1x10^-10 g
B. 2.5x10^-10 g
C 1.3x10^-10 g
D. 5.0x10^-10 g

Answers

The amount remaining at the end of 5 half-lives is 7.81×10¹³ g

From the question given above, the following data were obtained:

Half-life (t½) = 5730 yearsOriginal amount (N₀) = 2.5×10¹⁵ gNumber of half-lives (n) = 5Amount remaining (N) =?

The amount remaining can be obtained as follow:

N = 1/2ⁿ × N₀

N = 1/2⁵ × 2.5×10¹⁵

N = 1/32 × 2.5×10¹⁵

N = 0.03125 × 2.5×10¹⁵

N = 7.81×10¹³ g

Therefore, the amount remaining after 5 half-lives is 7.81×10¹³ g

Learn more about half-life: https://brainly.com/question/25783920

as the atoms of the elements from atomic number 3 to 9 are considered in sequence from left to right on the periodic table, the atomic radius of each successive atom is

Answers

Answer:

decreasing

Explanation:

from left to right the nuclear effective charge is increasing, attracting with a greater force the electrons and making the atom to reduces itd atomic radius

The atomic radius decreases along a period in periodic table.  Thus, from the third element Li to the 9th element fluorine, atomic radius decreases and F has the lowest radius among them.

What is atomic radius?

Atomic radius is the distance from the  nucleus to the valence shell. The atomic radius decreases from left to right in periodic table. Thus, the higher atomic radius is exhibited by metallic elements.

The horizontal rows in the periodic table is called periods. Along a period , atomic radius decreases and electronegativity increases. When moving to the right there is no increase in the number of shells and the filling of electrons does not achieve octet except for group 18. Hence, they are electronegative.

From atomic number 3 to 9 atomic number is decreasing. Hence, among these elements, the smallest one is fluorine (Z = 9).

To find more on atomic radius, refer here:

https://brainly.com/question/14544878

#SPJ5

Describe a method you could use to carry out paper chromatography.

Answers

Paper Chromatography Methodology :

paper chromatography, in analytical chemistry, technique for separating dissolved chemical substances by taking advantage of their different rates of migration across sheets of paper..The method consists of applying the test solution or sample as a spot near one corner of a sheet of filter paper.

[tex]\large\sf\red{♡♡}[/tex]

what are 6 uses of filtration?

Answers

Answer:

Coffee Filter.

Tea-bags.

Water Filters.

Sand Filtration.

HEPA Air Filters.

Automotive Filters.

Belt Filters.

Dialysis.

Explanation:

Why is salt a mineral

Answers

Salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in the form of a natural crystalline mineral is known as rock salt or halite. ... Salt is essential for life in general, and saltiness is one of the basic human tastes

HELP ME PLEASE I NEED HELP SO BADLY

Answers

State the given:

Moles of Sulfur = 5 moles

Molar mass of Sulfur = 32.06g/mol

Look through the formulas:

Moles = Mass/Molar Mass

Rearrange the equation:

Mass = Moles x Molar mass

Plug in your given:

5 moles Sulfur   x   32.06g

                                 1 mol

= 160.3g of Sulfur

how many pounds of gold are present in 1 cubic mile of seawater?

Answers

Answer:

38 pounds of gold in cubic mile of seawater.

preventive maintenance on a hot water heater includes:

Answers

A water heater can be regularly maintained by flushing it at least two times in a year.

A water heater is a device that is used to heat up water for home use. There are different types of water heaters but they all serve the same purpose at home. In order to maintain maximum efficiency, the water heater must be maintained regularly.

The following are routine maintenance operations on a water heater;

Inspect the heater regularly to ascertain if there are faults.Flush the heater at least two times each year.The anode rod should be changed after a couple of years

Learn more about water heater;https://brainly.com/question/4751630

A container that can't expand, may explode from the ________ in pressure.

Answers

Increased force ....
Other Questions
f(x) is graphed below. If g(x)=f(x+2)-4, what are the roots of g(x)? A boat heading out to sea starts out at Point AA, at a horizontal distance of 968 feet from a lighthouse/the shore. From that point, the boats crew measures the angle of elevation to the lighthouses beacon-light from that point to be 7^{\circ} . At some later time, the crew measures the angle of elevation from point BB to be 3^{\circ} . Find the distance from point AA to point BB. Round your answer to the nearest tenth of a foot if necessary. A set of 6 art books costs $241.25. A copy of one of the books, bought separately, costs $38.25. About how much less is the cost of the 6 books if you buy the set? Sophia drew a scale drawing of the elementary school. The scale of the drawing was 1 centimeter : 4 meters. The schoolyard is 52 meters wide in real life. How wide is the schoolyard in the drawing # I need help with my python code, it won't work, and no matter what I try, I can't get it to run properly. Every time I try top run it, it gives me an error saying:# syntaxError, bad input on line 43, I am not very good at programming, and I just started. I wanted to ask if you guys could help me. # Here's my code, the purpose of it is to be a rock paper scissors game:```import randomdef welcome_prompt(): print ("Rock paper Scissors game") print ("Rules: Rocks beats Scissors, Scissors beats Paper, Paper beats Rock")def get_player_move(): print ('Round ' + str(round)) print ("Please play one of the following") move = raw_input(" 1) [R]ock, 2) [P]aper, 3) [S]cissors:") if get_player_move == ("R"): print ("You used Rock!") return 1 elif get_player_move == ("P"): print ("You used Paper!") return 2 elif get_player_move == ("S"): print ("You used Scissors!") return 3 else: print "Invalid input, please use capitalized initial (R,P,S)" return get_player_move()def get_computer_move(): get_computer_move = random.randint(1,3) if get_computer_move == 1: print ("Computer used Rock!") return 1 elif get_computer_move == 2: print ("Computer used Paper!") return 2 elif get_computer_move == 3: print ("Computer used Scissors!") return 3def compare_moves(get_player_move, get_computer_move): if (get_player_move == 1 and get_computer_move == 1) or (get_player_move == 2 and get_computer_move == 2) or (get_player_move == 3 and get_computer_move == 3): print ("It's a tie!") return 0 elif (get_player_move == 1 and get_computer_move == 3) or (get_player_move == 2 and get_computer_move == 1) or (get_player_move == 3 and get_computer_move == 2): print ("You win the round!") return 1 elif (get_player_move == 1 and get_computer_move == 2) or (get_player_move == 2 and get_computer_move == 3) or (get_player_move == 3 and get_computer_move == 1): print ("You lose the round!") return -1 elif (get_player_move == 4): print ("You didn't put in correct input, computer gets a free win") return -1 player_score = 0 comp_score = 0 round = 0 welcome_prompt() ('Round ' + str(round)) while round< 10: round = round + 1 get_player_move() get_computer_move() compare_moves(get_player_move, get_computer_move) if compare_moves == 1: player_score = player_score + 1 print 'Player Score'+ str(player_score) print 'Computer Score'+ str(player_score) elif compare_moves == -1: comp_score = comp_score + 1 print 'Player Score'+ str(player_score) print 'Computer Score'+ str(player_score) print ("Game Over") read the sentence below and fill in the blanks to make a logical assertions using comparative and superlative construction2. Marcos tiene veintin aos. Consuelo tiene dieciocho aos, Mara tiene quince aos.Marcos es (the oldest of)_____los tres.Mara es (the youngest of)____los tres. Ashleigh went to Cape Canaveral to watch the space shuttle take off. The solid rocket boosters are ejected after the shuttle passes through the threshold of space. This is scheduled to occur when the shuttle reaches a height of 354,200 feet. If Ashleigh is 10 miles from the launchpad, what will be the angle of elevation she has to look up to see the boosters ejected? How is compound interest different from simple interest?O A. Compound interest accrues on the down payment as well as theprincipal.B. Compound interest accrues only on the initial amount borrowed.C. Compound interest accrues daily, monthly, or quarterly rather thanannually.D. Compound interest accrues on the interest, as well as theprincipal. Please please help me (15 points) Critique Reasoning Jamie says that theexpressions 6x - 2x + 4 and 4(x + 1) are notequivalent because one expression has a termthat is subtracted and the other does not. Doyou agree? Explain.a how far would your friend run in 30 minutes? how can I simplify of 9/20:3/5 please explain step by step Help help help help hep Which equation best fits the graphed data?6+4+2++X-6-4- 226N-2+..-4-6+ a web server is a computer that manages files for multiple user on a net work. true or false Find the value of x needed to make the equation true: -8.25x+12-1.75x=10.5x+1.75 8 . 25 x + 12 1 . 75 x = 10 . 5 x + 1 . 75 Please write your answer as a decimalplz help no links real answers is change in color a physical change associative property or commutative property, or identity property or zero property Read the excerpt from The Building of Manhattan.A temporary, small narrow-gauge track system was installed on each floor as it was needed. This enabled the material to be moved from the truck at ground level onto dump carts, raised by elevator to the designated floor, wheeled onto the track, and moved quickly to the exact spot needed. Turntables built into the track allowed the carts to be shifted about in any direction.Which question can be answered only if an illustration accompanies the text?What did turntables built into the track allow?How were dump carts raised to designated floors?When was a track system installed on a floor?What does a turntable built into a track loo PLZZZ HELP, BEST ANSWER GETS BRANLIEST AND ITS DUE IN 5 MINUTESSS, The figure shows two triangles on the coordinate grid:Which of the following statements is true about the three quadrilaterals? (5 points)A and B are similar but not congruent.A and C are similar but not congruent.A and B are similar and also congruent.B and C are similar and also congruent.