The radioactive substance which she is most likely measuring is cobalt-60
The correct answer choice is c
From the analysis given, this means that Juliet is measuring cobalt-60 as it was decreasing in mass from 200g to 50g. In addition to this, it is a synthetic radioactive material.
What are radioactive substances?Radioactive substances are those substances which undergoes radioactive decay. That is, the nucleus of these materials changes from an unstable to stable form by disintegrating.
However, these substances usually, frequently and most of the time used for diagnosis and also treatment of diseases. They are also used to study certain structures in the thebody.
So therefore, the radioactive substance which she is most likely measuring is cobalt-60. The correct answer choice is c
Complete question:
Juliet started working with a radioactive substance. In 1997, she started with 200 g. When she measured again in 2002, she had 100 g left. In 2007, she had 50 g. Which substance is she most likely measuring?
A. rubidium-91
B. iodine-131
C. cobalt-60
D. carbon-14
Read more about radioactive substances:
https://brainly.com/question/1581557
#SPJ1
PLEASE HELP
What is the frequency of a photon whose energy (E) is 7.48 x 10 -6 J?
Answer:
1.128*10¹⁹ [GHz].
Explanation:
1) the initial formula is
E=hν, where ν - required frequency,
2) according to the formula above
[tex]\nu=\frac{E}{h};\\ \nu=\frac{748*10^{-8}}{663*10^{-36}}=1.128*10^{28}[Hz][/tex]
Consider the reaction, 2 C3H8O(g) + 9 O2(g) → 6 CO2(g) + 8 H2O(g).
a. When 12 mol O2(g) react, how many moles of CO2(g) form?
When 12 moles of O₂ (g) react with C₃H₈O (g) then 8 moles of CO₂ (g) is produced. This is the chemical combustion reaction of propanol producing vapor of CO₂.
How to calculate the amount of CO₂ produced?Alcohols undergo combustion reaction in the presence of oxygen gas to produce vapor of CO₂ and water.
In the given equation,
2 C₃H₈O (g) + 9 O₂ (g) → 6 CO₂ (g) + 8 H₂O (g)
To calculate the number of moles of CO₂ produced, first we have to balance the equation:
Divide the equation by 2
C₃H₈O (g) + 9/2 O₂ (g) → 3 CO₂ (g) + 4 H₂O (g)
Calculate the number of moles of CO₂ (g) produced with 1 mol of O₂ (g)
9/2 O₂ (g) → 3 CO₂ (g)
1 O₂ (g) → 3÷9/2 CO₂ (g) = 0.66 mol CO₂ (g)
For 12 mol of O₂ (g),
12 × 0.66 = 8 mol CO₂ (g)
Therefore, 8 mol of CO₂ (g) is produced from 12 mol of O₂ (g).
Learn more about Combustion reaction here:
https://brainly.com/question/14335621
#SPJ1
Between periods at a hockey game, a machine called an ice resurfacer is used
to smooth down the ice. Explain how this affects the speed of the players on
the ice and why it has that effect.
HELP PLSSS
Oscar left a partially deflated balloon in his hot car for a couple of hours. When he returned the balloon seemed to be fully inflated. Somehow the volume of the balloon increased without anyone adding more air! Explain how this happened.
Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Zn2+, Al3+, Br−, S2−
The required empirical formula
Zn2+ ---> ZnBr2Al3+ --->ZnSBr− ---->AlBr3S2− ----> Al2S3This is further explained below.
What is the empirical formula?Generally, The empirical formula of a chemical compound is the most straightforward representation of the atom counts in the molecule as whole numbers.
As a straightforward illustration of this idea, consider the empirical formula of sulfur monoxide, which is denoted by the symbol SO, and compare it to the empirical formula of disulfur dioxide, which is denoted by the symbol S2O2.
Zn2+ ---> ZnBr2Al3+ --->ZnSBr− ---->AlBr3S2− ----> Al2S3Read more about the empirical formula
https://brainly.com/question/14044066
#SPJ1
An exothermic reaction is a
reaction that produces heat.
Which would describe this
type of reaction?
A. A physical change
B. A chemical change
C. A solution change
An exothermic reaction is a reaction that produces heat this type of reaction is a chemical change.
The correct option is B.
What is an Exothermic Reaction?Exothermic reactions are chemical in nature and are distinguished by the release of energy in the form of heat or light. One instance of this kind of reaction, when the release is in the form of both heat and light, is lighting a match. An exothermic reaction causes the release of heat, which raises the temperature of the surrounding area. An exothermic process process that absorbs heat cools the environment.
What four exothermic reactions are examples?Polymerizations, combustion, thermite reactions, mixing potent acids and bases As an everyday example, hand warmers exploit the exothermic reaction brought on by iron oxidation.
To know more about exothermic reaction visit:
https://brainly.com/question/10373907
#SPJ9
What are some of the ways that the features of carbon-to-carbon bonds influence the stability and 3-D structure of organic molecules?
Answer:
In order to draw the 3-D structure of an organic compound, we can use wedge-dash representation.
Forensic scientist Samantha Monzon is collecting physical evidence at a crime scene where someone was murdered. What does this process MOST likely involve?
A.
She will place all items in an airtight, plastic container.
B.
She will have to leave weapons such as guns and knives at the scene.
C.
She will need to obtain a search warrant before she collects anything.
D.
She will collect anything that could be related to the crime.
The process which most likely involves collecting physical evidence at a crime scene is she collecting anything that could be related to the crime and is denoted as option D.
What is Crime?This is referred to as unlawful behavior which is punishable by the law of an area or country and examples include theft, murder etc.
When crime takes place such as in the case of a murder, a professional who is referred to as a forensic scientist is invited to the scene so as to collect anything that could be related to the crime as this will help in the investigations by the appropriate bodies and ensure that justice is served.
Read more about Crime here https://brainly.com/question/24855448
#SPJ1
Answer: D. She will collect anything that could be related to the crime.
Explanation:
A(n) ___ is equal to the mass of a proton.
electron
nucleus
neutron
electron cloud
Answer:
neutron
Explanation:
A proton is one of three main particles that make up the atom. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms.
A 39.2 g sample of copper took
up the 4.4 cm3 of space.
What is the density of the
copper piece in g/cm3?
[?] g/cm³
A 39.2 g sample of copper took up the 4.4 cm³ of space , so the Density of the copper sample is 8.9 g/cm³.
What is density?Density is the ratio of the mass of a substance and the volume occupied by that substance. Density measures how tightly-packed the particles in a substance are the more tightly packed the particles are, the denser the substance will be.
The formula for calculating the density of a substance is given below as:
Density = mass/volume
Given :
The mass of the copper sample = 39.2 g
The volume of the copper sample = 4.4 cm³
Hence, the density of the copper sample will be:
The density of copper sample = 39.2 g/4.4 cm³
The density of copper sample =8.9 g/cm³
Therefore, the density of the copper sample is 8.9 g/cm³
To learn more about density, refer to below link:
https://brainly.com/question/15164682
#SPJ1
Answer: 8.9
Explanation: sample of 39.2 grams sample of copper took up to 4.4 centimeters of space. And then you will get the density of the copper piece in g/cm3.
A piece of chalk (mainly calcium carbonate) is placed in 250. mL of 0.468 M HCI.
All the CaCO3 reacts, releasing carbon dioxide gas and leaving 250. mL of a clear solution.
20.00 mL of the solution is pipetted into another flask.
29.8 mL of 0.0576 M NaOH is required to titrate the HCI remaining in this 20.00-mL portion.
What was the original mass of CaCO3 in the piece of chalk
To calculate mass of CaCO3, individual mass of the elements is taken (Ca= 40.1g/mol, C= 12.0g/mol, O=16.0g/mol). So, 40.1+12.0+48.0 = 100.1gmol. Therefore, 100.1 g/mol is the answer.
What is calcium carbonate?Calcium carbonate is a source of calcium in the supplemental form. It is also present as a part of exoskeleton in certain animals. It is also found as a component in eggshells.
It is obtained from carbon resources. Calcium carbonate is industrially used in production of limescale and in plaster of paris for roofing. It is often used to treat hyperacidity and given as an antacid.
Thus, calcium carbonate has wide range of chemical applications.
Learn more about calcium carbonate, here:
https://brainly.com/question/13565765
#SPJ1
Alien data statements
Why are nutrient molecules important?
Nutrient molecules are important because the body breaks down nutrient molecules into absorbable molecules that can produce energy in the body for carrying out daily tasks.
In order to sustain life and promote growth and health, our bodies need nutrients that are chemical components that can be found in food. Nutrients must come from our diet because the human body is unable to produce them.Three primary roles that nutrients play in the body include: supplying energy, supporting bodily structure, and controlling chemical reactions.Our body needs a variety of nutrients, including carbohydrates, protein, fat, minerals, vitamins, roughage, etc.Macronutrients are nutrients that must be present in large quantities. The three types of macronutrients are proteins, lipids, and carbohydrates. These might be metabolically converted into cellular energy.The body needs micronutrients in smaller levels, yet they are still necessary for performing basic activities. All of the necessary minerals and vitamins are considered micronutrients.Therefore, nutrient molecules are important for overall growth of our body.
Learn more about Vitamins here:
https://brainly.com/question/1913673
#SPJ9
How would you prepare 1.00 L of a 0.50 M solution of each of the following?
NiCl2 from the salt NiCl2. 6H2O
1. To prepare 0.5 M NiCl₂ solution, dissolve 64.8 g of NiCl₂ in 1 L of water
2. To prepare 0.5 M NiCl₂.6H₂O solution, dissolve 118.8 g of NiCl₂.6H₂O in 1 L of water
How to prepare solution1. How to prepare 0.5 M NiCl₂ solution
We'll begin by obtaining the mole of NiCl₂. This can be obatined as follow:
Volume = 1 LMolarity = 0.5 MMole of NiCl₂ =?Mole = Molarity x Volume
Mole of NiCl₂ = 0.5 × 1
Mole of NiCl₂ = 0.5 mole
Finally, can obtain the mass of NiCl₂ needed to prepare the solution as follow:
Mole of NiCl₂ = 0.5 moleMolar mass of NiCl₂ = 129.6 g/molMass of NiCl₂ =?Mass = mole × molar mass
Mass of NiCl₂ = 0.5 × 129.6
Mass of NiCl₂ = 64.8 g
Thus, to prepare 0.5 M NiCl₂, dissolve 64.8 g of NiCl₂ in 1 L of water
2. How to prepare 0.5 M NiCl₂.6H₂O solution
We'll begin by obtaining the mole of NiCl₂.6H₂O This can be obatined as follow:
Volume = 1 LMolarity = 0.5 MMole of NiCl₂.6H₂O =?Mole = Molarity x Volume
Mole of NiCl₂.6H₂O = 0.5 × 1
Mole of NiCl₂.6H₂O = 0.5 mole
Finally, can obtain the mass of NiCl₂.6H₂O needed to prepare the solution as follow:
Mole of NiCl₂.6H₂O = 0.5 moleMolar mass of NiCl₂.6H₂O = 237.6 g/molMass of NiCl₂.6H₂O =?Mass = mole × molar mass
Mass of NiCl₂ = 0.5 × 237.6
Mass of NiCl₂.6H₂O = 118.8 g
Thus, to prepare 0.5 M NiCl₂.6H₂O dissolve 118.8 g of NiCl₂.6H₂O in 1 L of water
Learn more about molarity:
https://brainly.com/question/15370276
#SPJ1
How many moles of ammonia would be required to react exactly with
0.230 moles of copper(II) oxide in the following chemical reaction?
2 NH3(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)
Answer: 0.1533 moles of NH3
Explanation: The reaction need 2 moles of ammonia and 3 moles of copper oxide to take place. If you have 0.230 moles of copper oxide you need:
0.230/3=0.0767*2=0.1533 moles of NH3
How many significant figures are in 0.20L
You mix 500.0 mL of 0.250 M iron(III) chloride solution with 475.0 mL of 0.350 M barium chloride solution. Assuming the volumes are additive, what is the molarity of chloride ion in the mixture
0.74 mol/lit
You mixed 500.0 mL of 0.250 M iron(III) chloride solution with 475.0 mL of 0.350 M barium chloride solution
As per given in the above statement,
volume of fecl3 = 5oo.ml
fecl3 = 0.250 M
= 0.250 mol/litre
volume of Bacl2, = 175.0mL
Bacl2 = 0.350M
= 0.350 mol/litre
we need to calculate moles of fecl3 and
Bacl2
first :
fecl3= 0.250 mol/litre (Molarity)
moles of FeCl3, = molarity * volume
= 0.250 * 500 ml
= 0.125 moles
moles of fecl3 = 0.125 moles
now, bacl2 = 0.350M
moles of bacl2 = molarity * volume
= 0.350 * 175/1000
= 0.061 moles
furthermore:
one mole of bacl2 will give one mole of ba^+2 and 3 moles of cl-
0.125 moles of fecl3 = 3 * 0.125 cl-
= 0.375 moles of cl-
similarly :
one mole of bacl2 will give one mole of ba^+2 and 2 mole of cl-
= 0.061 moles of bacl2 = 2 * 0.061
= 0.122 moles of cl-
total volume of solution :
= 500 ml + 1750 ml
= 0.675 litre
total number of moles of cl-
= 0.375 + 0.122
= 0.497 moles
now,
molarity of cl- = total moles of solute / volume of solution
= 0.497 moles/ 0.675 litre
= 0.74 mol/lit
molarity of cl- = 0.74 mol/lit
To know more about molarity visit :
https://brainly.com/question/8732513
#SPJ9
Arrange the following compounds in the order indicated below
and explain carefully the factors that lead to each other.
(a)
Increasing acid strength, CH,COOH, CH,CH.COOH,
CHFCOOHCH,CHCICOOH, CHCICH CH.COOH.
CHICCI,COOH, CH,CHCICOOH, CHCOOH,
(b) Decreasing base strength: NH,CH,, N(CH),.
(CH,)NH, CHÍNH
Any chemical compound that has carbon-hydrogen or carbon-carbon bonds is considered an organic substance in chemistry. Millions of organic compounds have been identified because of carbon's capacity for catenation.
Arrange the following compounds in the order indicated below
and explain carefully the factors that lead to each other.
The acid gets stronger the more EWG there is. Furthermore, the acid will be more potent if EWG is located closer to the source (COOH).
In sequence of increasing acidity:
(CH 3) 2CHCOOH < CH3CH2COOH < CH3COOH < ClCH2CH2COOH < ClCH2COOH
Similar to R groups, +I groups raise nitrogen's electron density, which raises an amine's basicity (an electron-rich substance is basic). The basic character of the supplied amines is influenced by the number of R groups on nitrogen. Basicity is also influenced by steric obstruction. Less basicity and more steric obstruction.
(CH3)2NH > CH3NH2 > (CH3 )3N > NH3
To know more about organic chemistry, click on the link below:
https://brainly.com/question/1594044
#SPJ9
Can the melting point of a substance be used as its fingerprint?
Answer:
Melting and boiling points are unique to the chemicals just like facial recognition. That does not necessarily means it is like a fingerprints.
Explanation:
please rate as brainliest
A cube of solid aluminum has a volume of 7.91×103 cm3 and a density of 2.699g/cm3. However, the cube was dropped and you were left with a chunk with a volume of 1.81×103 cm3. How many atoms of aluminum did you lose?
The number of aluminum atoms you lost, given the data from the question is 3.67×10²⁶ atoms
How to determine the number of aluminum atomsWe'll begin by obtaining the mass of the aluminum atoms lost. This is illustrated below:
Original volume = 7.91×10³ cm³ Density of aluminum = 2.699 g/cm³Volume remaining = 1.81×10³ cm³Volume lost = 7.91×10³ - 1.81×10³ = 6.1×10³ cm³Mass of aluminum lost =?Density = mass / volume
Cross multiply
Mass = Density × Volume
Mass of aluminum lost = 2.699 × 6.1×10³
Mass of aluminum lost = 16463.9 g
Finally, we shall determin the number of atoms of aluminum lost. This can be obtained as follow:
From Avogadro's hypothesis
1 mole of aluminum = 6.02×10²³ atoms
But,
1 mole of aluminum = 27 g
Thus,
27 g of aluminum = 6.02×10²³ atoms
Therefore,
16463.9 g of aluminum = (16463.9 g × 6.02×10²³ atoms) / 27 g
16463.9 g of aluminum = 3.67×10²⁶ atoms
Thus, 3.67×10²⁶ atoms of aluminum were lost
Learn more about density and number of atoms:
https://brainly.com/question/952755
https://brainly.com/question/28611842
#SPJ1
what is the mass of one sheet of paper in (g) of 500 sheets is 5 pounds? show in conversion factor
Answer:
1/5
Explanation:
1/5×500
=so guess this is the one
what statement can be made about an electrically neutral atom’s number of protons and electrons?
a student investigates the density of an aluminum cola can by submerging it in a measuring cylinder of water. When completely submerged, a full can of unopened cola displaces 337 ml of water. The student then empties the can, she finds that it holds 332 ml of cola and that the mass of the empty can is 13.5g when it's empty. Calculate the density of the aluminum used to make the can.
(I did 337-332= 5ml 13.5g/5ml= 2.7 g/cm^3 . I think I got it wrong)
The density of the can is 0.041 g/mL.
What is the density?The term density is the ratio of the mass to the volume of an object. We know that the volume is an intrinsic property of the substance. The volume does not change thus, it can be used to identify a substance.
Now we have that the volume of the liquid that the can could hold is 332 ml. This is the real volume of the aluminum can. The mass of the can is found to be 13.5g.
Density = mass/volume = 13.5g / 332 ml = 0.041 g/mL
Learn more about density:https://brainly.com/question/15164682
#SPJ1
Where should Franklin place this property in his table?
Answer:
to the left of his table :)
Which of the following statements is TRUE about graphic scores?
A. Graphic scores can only be written on manuscript paper
B. The performer can interpret the score however he/she wishes
C. Graphic scores cannot show dynamic changes
D. The composer is not allowed to make suggestions regarding the performance
The performer can interpret the score however he/she wishes in a graphic score. The correct option is B.
What is graphic score?A graphic score is simply another method of notating music or sounds on a page, in addition to the more traditional 5-line stave.
They created graphic scores or graphic notation, a new way of visualizing music. Graphic scores are frequently distinct from traditional musical scores.
Graphic scores, as opposed to lines and dots on a musical stave, can use a variety of images and symbols to instruct the performer on what to play.
In a graphic score, the performer can interpret the score however he or she sees fit.
Thus, the correct option is B.
For more details regarding graphic score, visit:
https://brainly.com/question/28814747
#SPJ1
how do you get that 1000g = 1 kg
is a one time explanation of one observation a hypothesis and a scientific theory 100 points
One time explanation of one observation is a hypothesis.
Whenever, an assumption is made juts by observation and without proper testing then that is referred as an hypothesis.
For example- If my friend is late, so I might assume that he or she must have been stuck in traffic. So, this assumption is not tested yet and is made based on my observation. So, this is a hypothesis.
Whenever, a conclusion is given after several experiments and testing after observing something in science is referred as scientific theory.
For example- Atomic theory given by Dalton was based on several experiments. However, theories can also be proved wrong as Dalton's theory was proved wrong later on my JJ Thomson.
To know more about observation here
https://brainly.com/question/3608740
#SPJ1
Unit 3 Problems #2
Write the hobel gas configuration &
Lewis dof diagram for:
Be, O, AI, CI, Ni, Xe, W
An atom's noble gas configuration starts with the elemental symbol of the last noble gas that came before it, then moves on to the arrangement of the remaining electrons.
A Lewis electron dot diagram, also known as an electron dot diagram, Lewis diagram, or Lewis structure, is a diagram that employs dots to represent the valence electrons of an atom. The number of dots corresponds to the atom's valence electron count.
Write the noble gas configuration & Lewis dot diagram for:
Be, O, AI, CI, Ni, Xe, W
The diagrams known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.
Be - [He] 2s 2O - [He] 2s 2 2p4Al - [Ne] 3s 2 3p1Cl - [Ne] 3s 2 3p5Ni - [Ar] 3d 8 4s 2Xe - [Kr] 4d 10 5s 2 5p 6W - [Xe] 4f 14 5d 4 6s 2To know more about noble gas configuration & Lewis dot diagram, click on the link below:
https://brainly.com/question/11628766
#SPJ9
You are boiling vegetables on the stove and notice the lid of the pot moving up and down Why?
Answer:
cause the pot is probably boiling over making a ton of bubbles and foam
Explanation:
Conductivity
If it conducts ____ or ____ it allows heat and electricity to ____ through ____
Based on the concept of conductivity, if it conducts heat or electricity, it allows heat and electricity to pass through it.
What is conductivity?Conductivity is the ability of certain materials to allow heat ad electricity to flow or pass through them easily.
Conductivity is the opposite or resistivity or insulation which is the property of material that makes them restrict the movement of heat or electricity through them.
Materials that allow heat and electricity to flow through them easily are called conductors.
Conductors are mostly metallic objects because metals allow heat and electricity to flow through them easily.
Other conductors are the electrolytes which are substances which when in molten form, allow electricity to easily pass through them.
In conclusion, conductivity denotes the ability of a material to allow heat and electricity to pass through it.
Learn more about conductivity at: https://brainly.com/question/13322537
#SPJ1