Which of the following is an example of chemistry in forensic science?
Estimating the trajectory and impact of bullet
Calculating the force needed for a body to have fallen at a specific location Using blood spatter patterns to establish how a body was stabbed
Extending DNA strands to match samples

Answers

Answer 1

Answer:

Extending DNA strands to match samples


Related Questions

3. Are the gates working and can be easily opened in case of
emergency?

Answers

Answer:

Yes, I think.

Explanation:

You cannot make an emergency door if you cannot open it easily. So if there is an emergency you need to be able to go threw it fast. So if there is a fire and you needed to just get out of there through the emergency door, just open it and you can get out.

The gates of an emergency exit must be easily opened in case of an emergency to let people out of the building.

It is required that building ought to have an emergency exit. The emergency exit is a door that can easily be opened so that people can leave via that door.

Hence, the gates of an emergency exit must be easily opened in case of an emergency to let people out of the building.

Learn more about emergency exit: https://brainly.com/question/4206267

How many moles of OH−(aq) (hydroxide ions)are present in the balanced redox reaction?
NO3−(aq) + ClO−(aq) + H2O(l) → NO(g) + ClO2−(aq) + OH−(aq)

Answers

There are 4 moles of (aq) showed in the reaction i think

Chemistry question balance equations

Answers

Answer:

I don't understand this question

Give an example of a model used in Earth science. Explain why models are particularly important to this field.

Answers

Answer:

Some examples include maps and globes. Conceptual Models - These models serve as a tool to piece together a variety of concepts together so that we can better conceptualize the phenomena under investigation.

Scientific models are used to explain and predict the behaviour of real objects or systems and are used in a variety of scientific disciplines, ranging from physics and chemistry to ecology and the Earth sciences

Imagine the following scenario involving marbles as "radioactive isotopes".

Let's say the half-life of green marbles is 1 million years.

In one hand, you're holding 2 green marbles. In your other hand, you're holding 500,000 green marbles.

Hypothetically, noting that we have two different starting amounts of "isotopes", how long will it take for half of each amount to decay?

Answers

Answer:

1 million years

Explanation:

The half life of a radioactive isotope refers to the time it takes for the radioactive isotope to decay to half of its original amount.

The half life of a radioactive isotope is independent of the amount of starting material. Hence, whether the amount of starting material is small or large, the half life of the substance remains the same.

Hence the half life of 2 green marbles and 500,000 green marbles is 1 million years.

Help i just need people to answer the question today

Answers

Answer:

1) Hydrogen

2) Methane

3) Carbon

4) Structural isomer

5) Ethene also known as ethylene

6) Hydrocarbons are widely used as fuel

7) Crude oil

Explanation:

what is the major organic product obtained from the following sequence of reactions Br Li Et2O CH2I2 Zn(Cu)

Answers

Answer: Hello the complete question showing the sequence is attached below

answer : Option C ( cyclopropane )

Explanation:

The Major organic product obtained from the following sequence of reactions attached below is : cyclopropane

from the sequence of reactions the first product will be lithiated alkaline and it will react with Cu to form Gilman reagent while the Gilman reagent will now react with alkene iodide to form cis alkene . major organic product that would be obtained when cis alkene reacts with Simmons smith reagent will be Cyclopropane

attached below is the detailed description of the products and the major organic product

An alternating current complete 100 cycles in 0.1s. it's frequency is​

Answers

Answer:

The frequency is 1000 cycles/s

Explanation:

An alternating current is an electrical current in which the current changes its magnitude and the sense cyclically. The frequency of this current is defined as the cycles that the current completes in one second.

As the current completes 100 cycles in 0.1 seconds, the frequency is:

100 cycles / 0.1s = 1000 cycles /s

The frequency is 1000 cycles/s

A change In which properly of light will have no effect on whether or not the photoelectric effect occurs

Answers

Answer:  intensity is the answer. Intensity has no affect on whether or not the photoelectric effect occurs.

Explanation:

Pure gold has a density of 19.3 g/cm³. if it is made into a crown. what will be the density of the crown? how can you find out if the crown is indeed made of pure gold and nothing else?​

Answers

Answer:

19.3g cm^3

If it deviates from the original 19.3g cm^3

CHEMISTRY HELP ASAP
Use this balanced equation for the two questions below:
2KClO3(s) → 2KCl(s) + 3O2(g)
9. How many moles of KClO3 are used to produce 9.9 moles of O2?

10. How many moles of O2 are produced from 11.2 moles of KClO3?

PLS SHOW WORK TOO THX

Answers

Answer:

1 mole of KClO_3 contains 3 moles of O.

10 moles of O_2 contains 20 moles of O.

You need 20/3 moles of KClO_3 to produce 10 moles of O_2

Explanation:

sana makatulong

The molar mass of two equally sized samples of unknown gaseous compounds is shown in the table.

Molar Mass Comparison
Gas Molar Mass
X 28 g/mol
Y 44 g/mol
At STP, which describes the density and effusion of both gases? (4 points)

a
Gas X has a higher density and effuses faster than Gas Y.

b
Gas X has a higher density and effuses slower than Gas Y.

c
Gas X has a lower density and effuses slower than Gas Y.

d
Gas X has a lower density and effuses faster than Gas Y.

Answers

Answer:

D.  Gas X has a lower density and effuses faster than Gas Y.

Explanation:

I took the test.

Lower Density = effuse/ diffuse fasterLower Molar Mass = effuse/ diffuse faster

Gas X has a lower density and effuses faster than Gas Y. Hence, option D is correct.

What is density?

Density is the amount or the number of entities that can be contained in an area. It is denoted by ρ and is calculated as,

ρ = Mass ÷ Volume

Diffusion is the process of movement of a substance from the area of higher concentration to the area of lower concentration.

Effusion  is the process of a gas being poured out through a hole diametrically smaller than the structural exit of the container.

The gas with a smaller mass will diffuse slower in rate than the gas with a higher mass.

Hence, Gas X has a lower density and effuses faster than Gas Y.

Learn more about density here:

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#SPJ5

Which is the limiting reactant?

Answers

Answer:

Explanation:

The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.

the limiting recsntjce is the size of the left colum

What determines the degree of polarity in a bond?

Answers

Answer:

The relative electronegativity of the two bonded atoms determines the polarity of a bond. If the difference in electronegativities between the two atoms is less than 0.4, the bond is nonpolar covalent. ... If the difference in electronegativities between the two atoms is more than 2.0, the bond is ionic.

The molecular weight (MW) of CuSO4 is 250g/mol. How many grams of CuSO4 are needed to make a 10 ml solution that has a molarity of 2.0 M?

Answers

Answer:

Explanation:

(The MW of CuSO4 is 250 g/mol).

Answer:

5 grams of CuSO4

Explanation:

First you make a stoichiometric relationship between the molarity and liters. So there is 2 mols per every liter. Then you put in the moleculur weight( for every mol there is 250 g). Then you have to get rid of the liters, so you times the equation by 0.01(this was found by 10ml converted into liters). After all of that you should end up with 5 grams of CuSo4

Propose a mechanism and predict the products for the solvolysis of 2-bromo-2,3,3-trimethylbutane in methanol.

Answers

Answer:

See explanation and image attached.

Explanation:

Solvolysis is a reaction in which the solvent is also the nucleophile. The reaction occurs by SN1 mechanism since it yields most stable carbocation. The SN1 mechanism predominates since a weak nucleophile/base is used.

The major product as shown is the image attached to this answer. The first step is the loss of the bromide ion followed by nucleophillic attack of the solvent. Loss of H^+ completes the mechanism.

Every force has a what?

Answers

Answer:

What do you mean Every force has a what?

Answer:

The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. ... The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.

A 36.6-mol sample of Co represents how many atoms?

Answers

Answer:

2.20 x 10²⁵ atoms

Explanation:

Atoms of CO= 36.6-mol sample

From Avogadro's constant, which is

(6.022 × 10^ 23 atoms per mole)

Then

Number of atoms=[ 6.022 × 10^ 23 atoms/mole] × [36.6-mol]

= 2.20 x 10²⁵ atoms

Hence, number of atom is 2.20 x 10²⁵ atoms

Show the work. Convert 150 mm Hg to psi.

pls help me, thanks

Answers

Answer:

2.9 psi

Explanation:

Pressure (mmHg) = 150 mmHg

Pressure (psi) =?

The pressure in pound per square inch (psi) can be obtained as follow:

51.715 mmHg = 1 psi

Therefore,

150 mmHg = 150 mmHg × 1 psi / 51.715 mmHg

150 mmHg = 2.9 psi

Thus, pressure in pound per square inch (psi) is 2.9 psi.

40 POINTS!!! Ice at 0.0 degrees C is combined with 50.0g of water at 75.0 degrees C. Calculate the grams of ice present initially if the entire mixture comes to a final temperature of 25.0 degrees C after the ice melts. Specific heat of water is 4.18 J/goC. SHOW WORK!

Answers

Answer:

mi = 31.28 g

Explanation:

According to the law of conservation of energy:

[tex]Heat\ Gain\ by\ Ice = Heat\ Lost\ by\ Water\\m_iL = m_wC\Delta T\\[/tex]

where,

mi = mass of ice = ?

L = Latent heat of fusion of ice = 334 J/g

mw =  mass of water = 50 g

C = specific heat of water = 4.18 J/g.°C

ΔT = change in temperature of water = 75°C - 25°C = 50°C

Therefore,

[tex]m_i(334\J/g) = (50\ g)(4.18\ J/g.^oC)(50^oC)[/tex]

mi = 31.28 g

Determine the equilibrium constant for the system N204 = 2NO2 at 25°C.
The concentrations are shown here: [N2O4]= 2.48x10-2M, [NO_]=1.41x10-2M.
HURRRYYY

Answers

Answer: K = 8.01 ·10^-3 M

Explanation:   K = [NO2] ² / [N2O4] = (0.0141 M)² / 0.0248 M = 0.00801 M

Because a water molecule has a negative end and a positive end it displays?

Answers

Answer:

A water molecule displays polarity by having negative and positive ends. Due to this charge difference, a water molecule is called a dipole.

Explanation:

Look at the diagram. Which shows the correct arrangement of electrons in water?

Answers

Answer:

Option 4

Explanation:

In water molecule, oxygen has -2 charge on it while the hydrogen has +1 charge and one atom of oxygen combines with two hydrogen atoms. A hydrogen need only two electrons to complete its octet (one electron is its own the second electron is shared by oxygen) and a oxygen needs 8 electrons (It has six of its own and two are shared by two hydrogen atom).

Hence, option 4 is correct

Answer:

Option 2

It's more balanced than the others

A weather balloon has a volume of 200.0 L at a pressure of 760 mm Hg. As it rises, the pressure decreases to 282 mm Hg.

a. Will the volume of the balloon increase or decrease? Why?

b. What is the new volume of the balloon? (Assume constant temperature)

Answers

Answer:

a. Increase

b. 539 L

Explanation:

Step 1: Given data

Initial volume (V₁): 200.0 LInitial pressure (P₁): 760 mmHgFinal volume (V₂): ?Final pressure (P₂): 282 mmHg

Step 2: Calculate the final volume of the gas

The pressure of the gas is inversely proportional to the volume. So, as the pressure decreases, the volume must increase. Assuming constant temperature and ideal behavior, we can calculate the final volume of the gas using Boyle's law.

P₁ × V₁ = P₂ × V₂

V₂ = P₁ × V₁/P₂

V₂ = 760 mmHg × 200.0 L/282 mmHg = 539 L

Which of the following limits a population's growth?

Answers

Answer:

hereeee

Explanation:

Limitations to population growth are either density-dependant or density-independent. Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size.

Answer: environmental factors

Explanation:

1. How is the law of conservation of mass shown by a balanced chemical equation?
A) The subscripts must be the same on both sides of the equation.
B) The total volumes of the substances must be the same on both sides of the equation.
C) The coefficients must be the same on both sides of the equation.
D) The number of each type of atom must be the same on both sides of the equation.

Answers

Answer:

D

Explanation:

hope this helps

Morgan wants to compare the weather conditions at her school each day during the week. She decides to measure and record weather data each day at noon. Which of the following measurements would be least useful to report?


humidity

elevation

wind speed

air temperature

Answers

Answer: Air Temperature

What is the mass in grams of precipitate formed when 250.0 mL of 0.360 M ZnCl₂ is mixed with excess KOH in the following chemical reaction?
ZnCl₂ (aq) + 2 KOH (aq) → Zn(OH)₂ (s) + 2 KCl (aq)

Answers

Answer:

8.95 g

Explanation:

ZnCl₂ (aq) + 2 KOH (aq) → Zn(OH)₂ (s) + 2 KCl (aq)

First we calculate how many ZnCl₂ moles reacted, using the given concentration and volume:

250 mL / 1000 = 0.250 L0.360 M * 0.250 L = 0.090 mol ZnCl₂

Then we convert ZnCl₂ moles into Zn(OH)₂ moles [ Zn(OH)₂ is the precipitate, as it is the solid]:

0.090 mol ZnCl₂ * [tex]\frac{1molZn(OH)_2}{1molZnCl_2}[/tex] = 0.090 mol Zn(OH)₂

Finally we convert 0.090 Zn(OH)₂ moles into grams, using its molar mass:

0.090 mol Zn(OH)₂ * 99.424 g/mol = 8.95 g

The mass of a substance is the product of the molar mass and the moles of the substance. The mass of precipitate formed in the reaction is 8.95 gm.

What is Mass?

The mass of the substance is the weight of the compound or the molecule present in the sample.

The balanced chemical reaction is shown as:

[tex]\rm ZnCl_{2} (aq) + 2 KOH (aq) \rightarrow Zn(OH)_{2} (s) + 2 KCl (aq)[/tex]

Given,

Volume (V) of zinc chloride = 0.250 L

Molarity of zinc chloride (M) = 0.360M

Moles of zinc chloride are calculated as:

[tex]\begin{aligned} \rm moles &= \rm molarity \times volume \\\\&= 0.360 \times 0.250\\\\&= 0.090 \;\rm mol\end{aligned}[/tex]

Moles of zinc hydroxide from zinc chloride are calculated as:

[tex]0.090\;\rm mol \; ZnCl_{2} \times \dfrac{ 1\;\rm mol \;\rm Zn(OH)_{2}}{1\;\rm mol\; ZnCl_{2}} = 0.090 \;\rm mol[/tex]

Mass is calculated as:

[tex]\begin{aligned} \rm mass &= \rm moles \times molar \; mass\\\\&= 0.090 \times 99.424 \\\\&= 8.95 \;\rm gm\end{aligned}[/tex]

Therefore, 8.95 gm precipitate is formed.

Learn more about mass here:

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AN object has a volume
of 77ml and a mass of
429. What is the density
of this object?

Answers

Answer:

4.254320865115cm or simplied 4.25cm

Explanation:

Explain what is meant by a river’s load, and describe how the load is carried.
Please hurry I m timed T-T

Answers

Answer:

A rivers load is gravel and sand. It is carried by being dragged, rolled, and bounced along the bed of the river.

Explanation:

Answer:

the amount of gravel and sand at a river

the load is carried by the moving water

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