The question relates to Blood Splatter Analysis and relates to both law and Forensic science.
What are the three key dates in Blood Splatter History?
The three key dates in Blood Splatter History and what those dates mean to evidence today are:
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The vertical columns on the periodic table are known as:.
Answer:
groups
Explanation:
In chemistry, the vertical columns are known as groups and the horizontal columns are known as periods.
sodium chloride procedure
Answer: Dissolve approximately 3 mg of Sodium Chloride in 2 mL of water.
Add 0.4 mL of silver nitrate TS and acidify with diluted nitric acid.
Please answer this
The compound CO2(s) sublimes readily at 25°C. Which properties are usually associated with a compound that undergoes this kind of change?
1. High vapor pressure and high intermolecular attractions
2. High vapor pressure and low intermolecular attractions
3. Low vapor pressure and high intermolecular attractions
4. Low vapor pressure and low intermolecular attractions
4. Compare and contrast the 2 reactions below and balance the reactions. Which reaction is
endothermic and which reaction is exothermic?
The first reaction is exothermic reaction because it release energy whereas the seocond equation is endothermic reaction due to absorption of energy.
Endothermic Reaction
The energy is absorbed from the surrounding environment in susch type of reaction. Energy is absorbed in the form of heat.
Exothermic ReactionThe energy is released from the reaction to its environment in this type of reaction. Energy is released as heat, electricity, light or sound.
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A chemist combines 300 mL of a 0.3 M Na2SO4 solution with 200 mL of 0.4 M BaCl2 solution. How many grams of precipitate form
The mass of the precipitate, BaSO₄ obtained from the given reaction is 18.64 grams
How to determine the mole Na₂SO₄Volume of Na₂SO₄ = 300 mL = 300 / 1000 = 0.3 LMolarity of Na₂SO₄ = 0.3 MMole of Na₂SO₄ =?Mole = Molarity x Volume
Mole of Na₂SO₄ = 0.3 × 0.3
Mole of Na₂SO₄ = 0.09 mole
How to determine the mole of BaCl₂Volume of BaCl₂ = 200 mL = 200 / 1000 = 0.2 LMolarity of BaCl₂ = 0.4 MMole of BaCl₂ =?Mole = Molarity x Volume
Mole of BaCl₂ = 0.4 × 0.2
Mole of BaCl₂ = 0.08 mole
How to determine the limiting reactantBalanced equation
Na₂SO₄(aq) + BaCl₂(aq) —> BaSO₄(s) + 2NaCl(aq)
From the balanced equation above,
1 mole of BaCl₂ reacted with 1 mole of Na₂SO₄.
Therefore,
0.08 mole of BaCl₂ will also react with 0.08 mole of Na₂SO₄.
From the above illustration, we can see that only 0.08 mole of Na₂SO₄ out of 0.09 mole given is neede to react completely with 0.08 mole of BaCl₂.
Therefore, BaCl₂ is the limiting reactant
How to determine the mass of the precipitate (BaSO₄) formedBalanced equation
Na₂SO₄(aq) + BaCl₂(aq) —> BaSO₄(s) + 2NaCl(aq)
From the balanced equation above,
1 mole of BaCl₂ reacted to produce 1 mole of BaSO₄.
Therefore,
0.08 mole of BaCl₂ will also react to produce 0.08 mole of BaSO₄.
The mass of BaSO₄ can be obtained as follow
Mole of BaSO₄ = 0.08 mole Molar mass of BaSO₄ = 137 + 32 + (16×4) = 233 g/mol Mass of BaSO₄ =?Mass = mole × molar mass
Mass of BaSO₄ = 0.08 × 233
Mass of BaSO₄ = 18.64 g
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The pH of a solution prepared by dissolving 0. 350 mol of solid methylamine hydrochloride (CH3NH3Cl) in 1. 00 L of 1. 10 M methylamine (CH3NH2) is ________. The Kb for methylamine is 4. 40 ⋅ 10-4. (Assume the final volume is 1. 00 L. )
For the pH of a solution prepared by dissolving 0. 350 mol of solid methylamine hydrochloride, the pH is mathematically given as
pH = 11.14
What is the pH value of a solution prepared by dissolving 0. 350 mol ?Generally, the equation for the pKb is mathematically given as
pKb = -logKb
Therefore
pKb of CH3NH2 = -log(4.40×10-4)
pKb of CH3NH2= 3.36
Hence
pKa= 14 - pKb
pKa= 14 - 3.36
pKa= 10.64
In conclusion, using
pH = pKa + log([A-]/[HA])
pH = 10.64 + log(1.10M/0.350M)
pH = 11.14
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Which describes isotopes? check all that apply. isotopes have the same atomic mass. isotopes have the same atomic number. isotopes are always stable. isotopes are always radioactive. isotopes are stable or radioactive. isotopes have different mass numbers.
Answer:
See below
Explanation:
Isotopes:
are atoms of the same element.have same number of electrons and protons.have different number of neutrons.have same atomic number.have different mass number.are either stable or reactive.Example:
Hydrogen has three isotopes, protium, deutrium and tritium.Chlorine has two isotopes, Chlorine-35 and chlorine-37.[tex]\rule[225]{225}{2}[/tex]
Any group of an element's isotopes will always contain an equal amount of protons and electrons. Their individual nuclei's capacity for holding neutrons will vary. The correct options are B, D, and F.
A set of atoms with the same atomic number but differing masses is known as an element's isotope. This indicates that the number of protons in each atomic nucleus and the number of electrons in the electron cloud of each isotope of an element is the same.
Some isotopes experience radioactive decay because of their unstable atomic nucleus. These isotopes are known as radioisotopes (or radionuclides) because they are radioactive by nature. Carbon-14, tritium (hydrogen-3), chlorine-36, uranium-235, and uranium-238 are a few examples of radioactive isotopes.
Thus the correct options are B, D, and F.
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Martin makes new cereal flavors for a major corporation. Which type of research tool would BEST help him to determine if people enjoy the new flavors?
Answer:
Surveys
Explanation:
Martin can make an interaction with people and take surveys to know whether people likes the new flavors.
What are surveys?Surveys are research techniques used to gather data from a designated group of respondents in order to learn more and acquire insights into a range of interesting topics. Depending on the methodology chosen and the objective of the study, they can be conducted in a variety of methods and serve a variety of objectives.
Direct questions to clients are the best approach to get information from them. Surveys are a good way to achieve it if you have a well-thought-out strategy.
Companies can use surveys to gather data to develop strategies and maintain the satisfaction of their employees and consumers while looking for solutions based on the results.
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The pictures show different organisms. Which characteristic do all organisms share?
A- All organisms are made of cells.
B- All organisms have cells with cell walls.
C- All organisms have cells with a nucleus.
D- All organisms can make their own food.
gIAnswer: It b
Explanation:
(9) Which is true from the following ?
(A) Size of A1+ < Size of Al (B) Size of A1+ > Size of Al
(C) Size of F < Size of F (D) Size of Nat = Size of Na
(10) For which element the highest shielding effect for outermost electron is observed ?
(A) Element of group 13 and period 2 (B) Element of group 13 and period 3
(C) Element of group 13 and period 4 (D) Element of group 13 and period 5
(11) Which one is the descending order of atomic radius of elements of third period.
Na(Z = 11), Mg (Z = 12), Al (Z = 13) and Si(Z = 14) ?
(A) Si > Al > Mg > Na (B) Na > Mg > Al > Si
(C) Na < Mg < Al < Si (D) Na > Al > Mg >Si
(12) Which order is true with reference to size of species ?
(A) Pb < Pb2+ < Pb++
(B) Pb4! > Pb2+ > Pb
(C) Pb > Pb2+ > Pb4+
(D) Pb2+ < Pb < Pb4+
Answer:
The correct answer is A and D.
Explanation:
Please I want brainliest.
Reason:
The size of the ions follows the order:
Negatively charged ion > Neutral atom >
Positively charged ion
This is because of the size of ions increases when the electrons are added to the outermost shell of an atom.
This happens due to the increase in
electron-electron repulsion.
Moreover, when the electrons are removed from an atom, then the affective nuclear charge that is experienced by the outermost electron increases.
Thus the size of the positively charged ion is least.
What is the apparent brightness of a star?
How bright it actually is
How bright it is compared to the sun
How bright it is from Earth
How bright it is from a certain distance
Answer:
it's bright where you can see it it's not that bright compared to the sun from Earth it's really not so bright
If a solute has really strong bonds between its particles, would you expect it to form a solution that gets hold or cold? Explain your reasoning.
Answer:
The temperature of the solute/solvent without any external effect would decrease.
Explanation:
As the bonding between the solute particles is really strong, therefore a large amount of energy is required to overcome these forces. So that the new bonding between the solute and solvent is created.
In order to achieve this, there will be a lot of energy required and that is through the heating process. So the solution will require energy so the solute will dissolve fully either by provision of external force i.e stirring or by heating.
Explanation:
A solution contains 5. 120 moles of Li2SO3 with a molarity of 6. 750 M. What is the volume of this solution
Answer: 0.759 L
Explanation:
molarity = moles of solute / liters of solution
so, 6.750 = 5.120 / liters of solution
liters of solution = 5.120/6.750 = 0.759 L
Which of these elements is the odd one out? Li Na Mg K Rb Cs
For the reaction below , label each reactant as an electron pair acceptor or electron pair donor and as a Lewis acid or a Lewis base. AlCl 3 +Cl^ -; AlCl 4 ^ -
Since the reaction shown in the question is an acid - base reaction in the Lewis sense; the Lewis acid here is AlCl3 while the Lewis base here is Cl^- .
What is a Lewis acid?A Lewis acid is a substance that accepts electron pair while a Lewis base donates an electron pair.
Now consider the given reaction; AlCl3 +Cl^- ------> AlCl 4 ^-. The Lewis acid here is AlCl3 while the Lewis base here is Cl^- .
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as star luminosity increases what else increases? (check all that apply)
a) carbon
b) temperature
c) size
d) nitrogen
Answer:
C
Explanation:
As the size of a star increases, luminosity increases. If you think about it, a larger star has more surface area. That increased surface area allows more light and energy to be given off.
In what organelle or membrane are triacylglycerols synthesized and fatty acids elongated?.
1 - In what organelle or membrane are triacylglycerols synthesized and fatty acids elongated?
A - Lysosomes
B - Peroxisome
C - Endoplasmic reticulum
D - Ribosomes
E - Nucleus
The answer is Endoplasmic reticulum
A chemical reaction that has the general formula of ab c → cb a is best classified as a reaction.
Answer:
single replacement
Explanation:
Single replacement is when the molecules switch with each another
for example:
Zn + CuCl₂→ZnCl₂ +Cu
Answer:
replacement
Explanation:
The lithosphere (crust) is broken into sections called ____, which float on top of the asthenosphere.
Answer: Tetonic plates
Explanation: just because
07. 2
Explain why caesium is more reactive than sodium.
You should answer in terms of electrons.
the molar solubility of x2s in pure water us 0.0395
The Ksp shows the extent of dissolution of a solute in solution. The Ksp of the solution is 2.5 * 10^-4.
What is Ksp?The Ksp is an equilibrium constant that is usd to show the extent of solubility of a solute in solution.
The equation for the solution of X2S is;
X2S(s) ⇄2X^+(aq) + S^2-(aq)
Ksp = [2s]^2 [s]
Since s = 0.0395 M
Ksp = 4s^3
Ksp = 4[0.0395 ]^3
Ksp = 2.5 * 10^-4
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Ok take two tell me if u can see it or not it's #9
ANSWER DISCLAIMER; IF DISSATISFIED, REPORT THIS ANSWER AS SOON AS POSSIBLE:
*This may not be an option but this is most definently another way of saying the answer, through this, learning can be improved instead of giving the answer right off the bat.*Answer:
The motion of the gas particles is random and in a straight-line.
Explanation:
According to the kinetic hypothesis, a gas is made up of a huge number of submicroscopic particles (atoms or molecules) that are all in continual, random motion. The swiftly moving particles clash with one another and with the container's walls on a regular basis. The phrase ideal gas refers to a hypothetical gas made up of molecules that adhere to a few rules: The molecules of an ideal gas do neither attract or repel one another. The sole interaction between perfect gas molecules would be an elastic collision when they collided or an elastic collision with the container's walls.
How much energy in Joules is required to convert 10 grams of ice at -10 °C to +10 °C water. s water = 4.18 joule/gram °C, sice = 2.09 joule/gram °C, Hfus 334joule/gram
Answer:
don't know just supporting u
Wind power was first used in the 1970s.
A. true
B. false
Answer:
B. false
Explanation:
Answer:
B (false)
Explanation:
Because, the earliest recorded evidence of wind energy being used dates to around 5000 BC in Egypt, where the sail was invented to catch the wind and propel boats along the River Nile
Balancing _CH4+_CO2=_CCl4+_HCL
Explanation:
the equation is wrong, please make sure you typed it correctly. because there is no way methane and carbon dioxide can give carbon tetra chloride and hydrogen chloride gas. It's impossible, the reactants and products donot match. Re-write the equation correctly again
Which statement best describes how deflating a soccer ball is evidence of matter?
The ball changes shape from round to flat.
The ball increases size and shape.
The mass of the ball has increased.
The temperature outside the ball has changed.
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how do you prepare saturated solution NaCl at 40°c?
use the Gizmo to create a path for carbon that begins and ends in the atmosphere. Fill in the steps in the path below. Then, label each location with the system it represents. Finally, summarize very briefly how the carbon atom got to that location.
What type of substance reacts with limestone (caco3) and produces carbon dioxide gas? a neutral substance a base an acid both an acid and a base
The type of substance which reacts with limestone and produces carbon dioxide gas is an acid.
What is limestone?Limestone is a basic compound with a molecular formula CaCO₃ and it reacts with acid to produce carbon dioxide gas.
Reaction between the limestone and an acid known as hydrochloric acid to produce carbon dioxide gas, water molecule and calcium chloride salt as:
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
Hence required substance is an acid.
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Answer:
c on edge
<3 hope this helps people.
2. Which was the independent variable in the experiment below? *
3 points
A. Amount of light
B. Soil type
C. Temperature
D. Health of plant
Answer:
I think it is C. Temperature, sorry if wrong.