Write a report to the FBI in which you explain whether or not the jars were most likely left by the unknown criminal or a copycat criminal. It is very important that you use your experimental results to justify your jar assignments. This means that you need to speak about each individual jar and justify each choice.
Answers
These are the following experimental results which justifies the jar assignments.
What is Zinc?
It is a transition metal with atomic number 30. It is represented as Zn. It belongs to group 12 , period 4 , d block.
What is Sand?
It is a granular material composed of finely divided rock and mineral particles.
What is Salt?
It is a substance produced by the reaction of an acid with a base.
The data collected by group 1 tells about the presence of zinc, sand and salt. They simply mentioned about their presence but there is no scientific evidence whether the metal they saw is zinc. It also doesn't explain which salt it is.
Group 2 recorded it by saying yes. Thus they only know that there are three substances inside the jar. They did not try to separate the three by any scientific methods.
The data collected by group 3 shows that they put forward a step to separate the components .But it was not perfect. In the findings they mentioned that they separated sand but the method of separation is not clear. Moreover they mentioned about water and its evaporation. Where did the water come from? We can assume that they added water for the separation.
There is only one difference between group 4 and group 2. Here they made a tabular chart and mentioned yes.
Group 5 did all the experiments correctly. The tabular chart mentions about the observation, experiments , result and final conclusion about the three components. They separated them successfully. If it is understood that the three components are zinc, sand, salt then their try was perfect
Group 6 presented a simple finding and like the group 3 they could not find any salt.
Thus we can conclude that group 5 did all the experiments correctly
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Related Questions
if atom contain types of alpha heavy particle ,how can the two positive alpha particle penetrate the atom?
Answers
The alpha particle can penetrate through small distances and up to a certain range and penetrate the materials.
The alpha particles are mainly used (in very small amounts) in materials such as smoke detectors. Also, alpha particles have a very less ability to penetrate other materials. In other words, these particles of ionizing radiation can be blocked by a sheet of paper, skin, or even a few inches of air.They are relatively heavy, and only travel about an inch in air. Alpha particles can easily be protected by a single sheet of paper and cannot penetrate the outer dead layer of skin, so they pose no danger when their source is outside the human body.
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Please explain and answer
Answers
To have only two significant figures we must have to add a decimal point and two zeros.
What are significant figures?The term significant figures refers to the figures that we could assign a place value. These are the figures that could be assigned a place in a string of digits. The nonzero values to which it is possible that we could give a place can be called a significant figure.
Having established that, we can see that the number 52 has two significant figures. The number 5.209 has three significant figures. If we want the value 52 to retain having only two significant figures then we have to add a decimal point and two zeros.
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At what temperature (in °C) would a 0.00570 M solution of glucose in
water exhibit an osmotic pressure of 0.150 atm?
Answers
The temperature (in °C) that a 0.00570 M solution of glucose in water for an osmotic pressure of 0.150 atm is 522.33 C
The temperature of the glucose solution is c=0.00230 M
Osmotic pressure in the solution is 0.150 atm
Glucose is non dissociable so i=1
The osmotic pressure is as follows;
π=icrt
T=0.150/1×0.0023x0.082
T=795.33 K
T=522.33 C
The temperature of solution is 522.33 C
Osmotic pressure is defined as the minimum pressure which needs to be applied to a solution to stop the inward flow of its pure solvent across a semipermeable membrane.The osmotic pressure of a solution is proportional to the molar concentration of the particles of solute in the solution.To learn more about osmotic pressure visit:
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What conditions would be predicted based on the information in the weather map? A. The advancing mass of cold air creates a low pressure area. B. The cold front advances without bringing any change in the weather. C. The high pressure causes cold air to move toward the low pressure areas. D. The cold front advances from an area of high temperature to an area of low pressure.
Answers
Answer:
Explanation:
The high pressure causes cold air to move toward the low pressure areas
So c
Which layer of the Earth has plasticity?
Answers
Answer:
The mantle is the thickest layer of Earth, making up about 85% of Earth's volume. The lower mantle is pretty solid stuff, while the upper mantle moves around like silly putty. This movement of rock without breaking is called plasticity, and the liquid part of the mantle is referred to as the asthenosphere.
Explanation:
upper mantle
Brainliest please
The layer of the Earth that has plasticity is the asthenosphere, located in the upper part of the mantle.
The asthenosphere is the upper mantle underneath the lithosphere. Its partially molten, ductile nature gives it flexibility.
High temperatures and pressure make the asthenosphere plastic. Under extreme heat and pressure, these rocks distort and flow slowly over time. The asthenosphere's plasticity lets Earth's tectonic plates move.
Unlike the asthenosphere, the lithosphere—the crust and part of the topmost mantle—is hard and brittle. Tectonic plates interact and migrate over the asthenosphere.
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A student wants to measure out a 0.163 mol sample of barium fluoride (BaF2). How many grams of is this?
Additional Information:
If needed, Molar Mass of BaF2 is 175.34 g/mol
If needed use 6.022 x 1023 for Avogadro's number.
Format your answer:
With three significant figures
Include the correct unit.
Answers
Answer:
28.6 grams BaF₂
Explanation:
To find the amount of BaF₂ in grams, you need to multiply the given value (moles) by the molar mass. The molar mass is a ratio which describes the mass (g) of BaF₂ per every 1 mole. It is important to arrange the ratio in a way that allows for the cancellation of units (moles should be in the denominator).
Molar Mass (BaF₂): 175.34 g/mol
0.163 moles BaF₂ 175.34 grams
---------------------------- x ----------------------- = 28.58042 = 28.6 grams BaF₂
1 mole
age
The correct symbol for Cl with 20 neutrons and 12 electrons is
Select one:
O a. 1737 C1³+
O b.
17³5 CI+
17³5 Cr
1737 C15+
O c.
O d.
O e. 17³5 Cl
Next page
Answers
The correct symbol for Cl with 20 neutrons and 12 electrons is 37/17 C1⁵+ (option D).
What is atomic number?Atomic number is the number of protons in an atom. The number of protons and electrons in a neutral atom is the same i.e. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral.
The charge on an atom is related to its valence electrons or oxidation state.
The overall charge of an atom is determined by the number of protons and electrons in the atom. For example; an atom with more protons will be positively charged while an atom with more electrons eill be negatively charged.
According to this question, a chlorine atom has 20 neutrons and 12 electrons. The proton number of chlorine is 17.
This means that the mass number of chlorine is 20 + 17 = 37 and the charge is 17 - 15 = 2+.
Therefore, the correct symbol for Cl with 20 neutrons and 12 electrons is 37/17 C1⁵+.
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express the number 0.000114 in scientific notation.
Answers
1.14 x 10^-4
its correct
What is the relationship between KMT and Sea Level Rise?
CER format
3-4 sentences
Answers
Sea level may rise as a result of the expansion of seawater and the melting of land-based ice due to a warming environment.
What is the sea level?The sea level is the fundamental level for calculating height and depth on Earth. Since the ocean is one continuous body of water, its surface tends to seek a constant level. The sea surface is not actually level due to winds, currents, river discharges, fluctuations in gravity, and temperature.
Why is sea level important?People are impacted by sea level changes through flooding, the inability of rivers to empty into the ocean due to the sea being too high, and the surge of seawater onto the land during storms. Our drinking water and the ability to cultivate crops could be harmed if sea water gets into farms and reservoirs.
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Which of the following statements is FALSE in regards to herpes?
A. A symptom of herpes is flu-like symptoms.
B. Herpes simplex symptoms will occur in about a week of contraction.
C. Only herpes simplex I affects the face as a cold sore and herpes simplex Il affects the genitals.
D. There is no cure for HSV.
Answers
Answer:
B. is false
Explanation:
-there is no cure for hsv,
-herpes simplex I does affect the face as a cold sore, and herpes simplex II does affect the genitals
- a symptom of herpes can be flu like symptoms, everyone is different, some people don't even have any symptoms at all
would you expect an atom to have a charge?
Answers
Answer:
An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral.
A patient is in the dental office to begin a preparation for veneers on teeth #6,#7,#8,#9, and #10. the dental assistant has set up the operatory for the procedure and has all the correct armamentarium ready to start the preparation. After reviewing the patients medical history, the dental assistant notices that the patient has had four heart surgeries. what changes should be made in the setup of this procedure and why
Answers
The changes which should be made in the setup of this procedure is the reduced lacing of the gingival retraction cords with racemic epinephrine.
Who is a Dentist?These are healthcare professionals who are trained and specialize in the care of the oral health of individuals.
In the Veneer preparations , a dental impression which has to be made which is the reason why gingival retraction cords with racemic epinephrine has to be used for effective results. Ina scenario where the patient has had four heart surgeries the the epinephrine should be reduced or other options used because it could increase heart pressure and lead to complications.
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Pls help its urgent?What is the relationship between KMT and Sea Level Rise?
CER format
3-4 sentences
Answers
The relationship between KMT and sea level rise is 760 nm as the sea level rises because the gas level is increasing.
KMT is described as the behavior of gases and also it is used to explain the macroscopic properties of a gas such as pressure and temperature.
Sea level rise is an increase in the level of the world oceans due to the effects of global warming and burning fossil fuels is one of the causes of global warming because it releases carbon dioxide and other heat-trapped gasses into the atmosphere.
So, the relationship between kinetic molecular theory (KMT) and sea level rise is the distance between sea level and KMT which is 760nm as the sea level is rising because the gas level is increasing.
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The specific gravity of granite is 2.80. If the weight density of water is 62.4 lbs/ft3, what is the weight density of granite?
Answers
Based on the specific gravity of granite, the weight density of granite is 174.72 lbs/ft³.
What is specific gravity?The specific gravity of a substance is the ratio of the density of the given substance to that of the ratio of a reference substance usually water.
Specific gravity is also known as relative density of that substance.
Specific gravity is dimensionless since it is the ratio of two similar quantities.
Considering the given data:
The specific gravity of granite is 2.80.
This means that the ratio of the weight density of granite and that of water is 2.80.
The weight density of water = 62.4 lbs/ft³
The weight density of granite = ?
2.80 = weight density of granite/ weight density of water
The weight density of granite = 2.80 * weight density of water
The weight density of granite = 2.80 * 62.4 lbs/ft³
The weight density of granite = 174.72 lbs/ft³
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You have 30.33 g of limestone that decomposes by heat to give 25.53 g of solid calcium oxide and some amount of carbon dioxide gas. Predict the mass of carbon dioxide gas that must be produced.
Answers
The mass of carbon dioxide gas that must be produced is 1.6 grams.
What is carbon dioxide?Carbon dioxide is a gas that is made up of carbon and oxygen.
Given, that the mass of limestone is 30.33 g
The mass of solid calcium oxide is 25.53 g
The molar mass of 56.0774 g/MOL
The number of moles = 25.53 / 56.0774 = 0.4552 mol
The mass of carbon dioxide will be
Say you have 1 mole of CO2.
The molar mass of CO2 is the mass of 1 mole of carbon atoms, i.e. 12 grams plus the mass of 2 moles of oxygen atoms,
16 × 2 = 32 grams.
Thus, the mass of carbon dioxide is 1.6 grams.
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Which of the following is an intensive property of a sample of water?
A. Mass
B. Molar mass
C. Number of moles
D. Volume
Answers
Molar mass is an intensive property of a sample of water.
The molar mass of a certain chemical entity is its mass per unit quantity (symbol M, SI unit kgmol1). Always identify the chemical in question in accordance with the definition of the mole. A substance's molar mass is the volume of the material that contains one mole of the substance. Its basic definition is the weight of a single mole of a substance. The atomic mass of each substance is multiplied by the subscript of that element in the chemical formula to determine the molar mass.
One mole of a specific compound or material has a mass of 1 molar. We are aware that the number of moles in a compound (n) can be expressed as the ratio of the compound's given mass to its molar mass. This is measured in g mol1, the standard unit. However, the SI unit, kg mol 1, is quite uncommon. The amount of particles in 1 mole of the substance is equal to the number of atoms present in 12g of the 12C isotope.
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Which of the following structures can differentiate between plant and animal cells
Answers
Name 3 sources for ions in seawater
Answers
12.24 cm (wavelength of a microwave oven)
Answers
The question is incomplete, however, 0.245 x 10^10 s^ -1 is the frequency of 12.24 cm (wavelength of a microwave oven).
we have given, λ= 12.24 cm, in the statement,
ν = c / λ where c is the velocity of light , i.e 3 x 10^10 cm/s
So, putting the value of c and λ= 12.24 cm,
we get,
ν = 3x 10^10 cm s^-1 / 12.24 cm
= 0.245 x 10^10 s^-1
Frequency is the quantity of full oscillations generated by a wave particle in a unit of time.When a wave travels from one place to another, its frequency describes how frequently a medium particle vibrates. The frequency of a wave may be calculated mathematically by counting how many full oscillations are produced during its propagation in one unit of time. The number of waves passing a given location in a unit of time may thus be used to characterize it.To know more about frequency visit : https://brainly.com/question/14316711
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suppose that you and a friend see brightly colored pigeons like these at a nature park. because pigeons are usually gray and white, you both wonder where these colors came from suddenly, your friend says i have a theory these birds must get their colors from eating food that has the same colors
Answers
The correct answer is no. The explanation given by my friend is not a scientific theory, that's why it is not correct.
What is a scientific theory?A scientific theory is a well-organized explanation that frequently includes a scientific hypothesis and scientific principles to explain a collection of facts or events in the natural world.
Scientists use the word "theory" a little differently than the public, according to Jaime Tanner, a biology professor at Boston's Emerson College. Most people use the word "theory" to describe an opinion or hunch, but in science, the term relates to how we interpret the data.
A scientific theory is a phenomenon that has been observed and verified. For a declarative assertion to be elevated to the status of a theory, it must first have been tested in the form of experiments by several researchers and found to be accurate. A statement can be considered a hypothesis if it is stated on the basis of perception, with little or no experimental evidence to back it up. A theory is something entirely different.
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4. The following precipitation reaction can be used to determine the amount of copper ions dissolved in solution.
A chemist added 5.00 × 10−2 L of a solution containing 0.173 mol L−1 Na3PO4(aq) to a 5.00 × 10−2 L sample containing CuCl2(aq). This resulted in a precipitate. The chemist filtered, dried, and weighed the precipitate. If 1.21 g of Cu3(PO4)2(s) were obtained, and assuming no copper ions remained in solution, calculate the following:
a. the concentration of Cu2+(aq) ions in the sample solution.
b. the concentrations of Na+(aq), Cl−(aq), and PO43−(aq) in the reaction solution (supernatant) after the precipitate was removed.
Answers
a) In the sample solution, concentration of Cu^2+ ions = 0.191 mol L-1
b) Concentration of Na+ = 0.0865 mol L-1
Concentration of Cl- = 0.1908 mol L-1
Concentraion of PO42- = 0.0199 mol L-1
Reaction of Na3PO4 and CuCl2 gives 1.21 g of Cu3(PO4)2 as a precipitate. But after precipitation, no Cu2+ ions are left which means, the number of moles of Cu2+ present will be 3 × 3.18 mmol = 9.54 mmol ( same for CuCl2 as it contains only 1 Cu+ ion) ( From the formula 1 mole of Cu3(PO4)2 will give 3 moles of Cu2+ ions). the concentration of Cu2+ ions in the sample will be 9.54 × 10^-3/ 5.00 ×10^-2 = 0.191molL-1Now in the final mixture, we have 0.1 L of solvent. ( 5.00 ×10^-2 + 5.00 ×10^-2 ).Number of moles of Na+ = Volume × Molarity = 5.00 × 10^-2 L ×0.173 mol L-1 = 8.65 mmol ( As it is not present in the precipitate, we have to take the initial number of moles)Concentration of Na+ = 8.65 × 10^-3/ 0.1 == 0.0865molL-1Number of moles of Cl - = 2 × 9.54 = 19.08 mmol ( From the formula one mole of CuCl2 gives 2 moles of Cl- )Concentration of Cl- = 19.08× 10^-3 0.1 = 0.1908molL-1 Number of moles of PO42- = Number of moles in Na3PO4 - Number of moles in the precipitate = 8.35 - 2 ×3.18 = 1.99 mmol ( In Na3PO4 there is only one PO42- whereas in the Cu3(PO4)2 there are 2 PO42-Concentration of PO42- = 1.99× 10-³ / 0.1= 0.0199molL-1To know more about Concentration visit : https://brainly.com/question/17639158
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An atom of an element contains 20 protons and 21 neutrons. Which of these is true of the element?
it is a noble gas
it is a transition element
it is a nonmetal
it is an alkaline earth metal
Answers
Answer:
It is an Alkaline earth metal
Explanation:
20 protons meaning the element is 20 on the periodic table-Calcium.
The number of neutrons does not matter
Calcium is not a noble gas, transition metal, and nonmetal.
Calcium is in the 2nd group meaning it is an alkaline earth metal.
What is the mass of phosphorus in a 45 kg person?
Answers
Answer:
Mass of phosphorus = (435kg)(0.01) = 0.45 kg
Which of these is a way to tell if something is a compound?
Answers
Answer:
Answer: Image 3 is a compound.
Explanation: A compound is something that consists of two or more different elements bonded chemically.
A molecule is formed when two or more elements combine chemically.
An element is described as something which cannot be broken down by any chemical means.
We are given 4 images.
Image 1 is an element as it is showing the shell structure of Oxygen (O) element.
Image 2 is an element as only 1 element is known that is Magnesium (Mg).
Image 3 is a compound as in the structure 2 elements are shown which is bonded together. Elements present in this are Carbon (C) and Oxygen (O).
Image 4 is a molecule as in the structure 2 H-atoms combine chemically, but it cannot be considered as compound as the two elements are not different.
Explanation:
How many oxygen atoms are in 4.00 g of quartz?
Answers
Answer:
Rounding for significant figures gives us a final answer of 3.41×1022 atoms 3.41 × 10 22 a t o m s atoms of oxygen.
What is the electron configuration for 1s22s22p63s2
Answers
Answer:
its atomic no is 12
Explanation:
name = MAGNESIUM
Atoms of C-12, C-13, and C-14 have the
same number of protons but a different number of neutrons.
same number of neutrons but a different number of protons.
same number of electrons but a different number of protons.
same number of protons but a different number of electrons.
Answers
Answer:
same number of protons but different number of neutrons.
Help me out with this chem problem please
Answers
Answer:
6.36 x 10²⁰ atoms
Explanation:
To find the number of atoms in the P₂O₅ sample, you need to (1) convert grams to moles (using the molar mass of P₂O₅) and then (2) convert moles to atoms (using Avogadro's number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs like the given value (0.150 g = 3 sig figs).
Atomic Mass (P) = 30.97 g/mol
Atomic Mass (O) = 16.00 g/mol
Molar Mass (P₂O₅): 2(30.97 g/mol) + 5(16.00 g/mol)
Molar Mass (P₂O₅): 141.94 g/mol
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
0.150 g P₂O₅ 1 mole 6.022 x 10²³ atoms
----------------------- x ---------------- x ------------------------------- = 6.36 x 10²⁰ atoms
141.94 g 1 mole
an ant eater can eat 6.9 pounds of ants in a day. if each ant has a mass of 82 mg how many ants do they eat in one day??
Answers
The number of ants the anteater can eat in a day is 39123 ants.
What is the number of ants the anteater can eat in a day?The number of ants the anteater can eat in a day is calculated as follows:
mass of ants the anteater can eat in day = 6.9 lb
mass of ants the anteater can eat in day in g = 6.9 lb* 453.6 g/1 lb
mass of ants the anteater can eat in day in g = 3129.84 g
mass of one ant in g = 80/1000 = 0.08 g
number of ants the anteater can eat in a day = 3129.84 g/0.08 g
number of ants the anteater can eat in a day = 39123
In conclusion, the number of ants the anteater can eat in a day is obtained from the ratio of the mass of ants eaten by the anteater in a day and the mass of one ant.
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For the reaction
Ti(s)+2F2(g)→TiF4(s)
compute the theoretical yield of the product (in grams) for each of the following initial amounts of reactants.
1. 4.0 g Ti , 4.0 g F2
2. 2.2 g Ti , 1.8 g F2
3. 0.225 g Ti , 0.283 g F2
Answers
The theoretical yields in each case are;
1) 13.64 g
2) 5.82 g
3) 0.92 g
What is the theoretical yield ?We know that the stoichiometry of the reaction is the tool that we could use to obtain the parameters that has to do with a given reaction. We have the reaction; [tex]Ti(s)+2F_{2}(g)------- > TiF_{4} (s)[/tex]
1) Number of moles of Ti = 4.0 g/48 g/mol = 0.08 moles
Number of moles of [tex]F_{2}[/tex] = 4.0 g/38 g/mol = 0.11 moles
If 1 mole of Ti reacts with 2 moles of [tex]F_{2}[/tex]
0.08 moles reacts with 0.08 moles * 2 moles/1 mole
= 0.16 moles
[tex]F_{2}[/tex] is the limiting reactant
Mass of [tex]TiF_{4}[/tex]= 0.11 moles * 124 g/mol = 13.64 g
2) Number of moles of Ti = 2.2 g /48 g/mol = 0.045 moles
Number of moles of [tex]F_{2}[/tex]= 1.8 g/38 g/mol = 0.047 moles
If 1 mole of Ti reacts with 2 moles of [tex]F_{2}[/tex]
0.045 moles of Ti reacts with 0.045 moles * 2 moles/1 mole
= 0.09 moles
[tex]F_{2}[/tex] is the limiting reactant
Mass of TiF4 = 0.047 moles * 124 g/mol = 5.82 g
3) Number of moles of Ti = 0.225 g/48 g/mol = 0.0047 moles
Number of moles of [tex]F_{2}[/tex] = 0.283 g/38 g/mol = 0.0074 moles
If 1 mole of Ti reacts with 2 moles of [tex]F_{2}[/tex]
0.0047 moles of Ti reacts with 0.0047 moles * 2 moles/1 mole
=0.0094 moles
[tex]F_{2}[/tex] is the limiting reactant
Mass of [tex]TiF_{4}[/tex]= 0.0074 moles * 124 g/mol = 0.92 g
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