Answer:
Gunshot residue is important to forensic scientists because it can help measure the firing distance of a weapon, or if someone has fired a weapon lately based on what's on their hands. The potential complications of this evidence include it being uncertain if the residue is from another firing. This type of evidence can also be uncertain in a courtroom when firing distance is drawn into question.
Explanation:
which of these is true about the total amount of energy in a closed system?
Decreases
Destroyed and created
Increases
Remains the same
Answer:
It remains the same
Explanation:
Isotopes have the same number of ________with different numbers of ________.
My choices
electrons, neutrons, protons
Answer:
electrons, protons i think
Explanation:
I didn’t get any help my recent question so I’m posting it again to see if anybody sees it this time
Question!!!
Determine half life exploration of isotopes
The example of water boiling away is used to illustrate that water
is not always soluble.
is an unstable substance.
lacks thermal properties.
can change from solid to gas.
Answer:
change from solid to gas
Hii!! I believe the correct answer is D. can change from solid to gas. ((:
Can someone plz help I also mark braniliest!
Answer:
D. The chemical formula
Explanation:
For example, in the compound KCl, we know that there are two elements present because you can see it in the chemical formula. We know that KCl consists of potassium and chloride ions.
EASY
QUICK
What’s the molecular mass of Calcium Carbonate ?
Answer:
100.0869 g/mol
The molar mass of CaCO3 is 100.0869 g/mol. We need to add the molar masses of calcium (40.078 g/mol), carbon (12.0107 g/mol) and three oxygen atoms
Explanation:
Which phrase best describes bronze?
o a pure metal
o a copper-tin alloy
o a mineral ore containing copper and tin
an ionic compound of copper and tin
Answer:
o A copper-tin alloy
Explanation:
Bronze is composed by copper and tin. This means it is not a pure metal.Bronze cannot be mined, so it is not a mineral ore.An ionic compound of copper and tin could also be theoretically used to describe a non-solid ionic compound of copper and tin. However bronze is solid.Hence the answer is A copper-tin alloy.If someone trys to lur u into a car with candy...say NO. and run away
-THE MORE U KNOW
_NINI
Answer:
as u should. candy ain't even that tempting >^<
Answer:
How about free hoodies and chocolate.....Jkjkjk.....that happened to me once then I got rap edh
Explanation:
5. Elmer really likes to cook with onions and he puts onions into almost everything he makes. He usually starts dinner every day around 5:00 p.M. As he is cutting the onions, the grandfather clock chimes five times because it is 5:00 p.M. Elmer is also crying because cutting the onions makes his eyes water. One evening he is at a friend's house because they are going out to dinner later. He and his friend are watching TV and the clock chimes five times when it is 5:00 p.M. Elmer's eyes start to water.
Answer and Explanation:
A) Unconditioned Stimulus- The onion
B) Unconditional Response- Crying
C) Conditioned Stimulus- Chiming clock
D) Conditioned Response- Crying
In the above scenario( an example of classical conditioning), Elmer has been conditioned by the continuous iterations of having to cook everyday by 5pm. He cooks with onions by 5pm around the same time his uncle's clock chimes five times. He cries/has teary eyes(unconditioned response) because of the response to the onions(unconditioned stimulus) around the same time the clock chimes five times thereby conditioning his response so that even when the onions isn't there/he isn't even cooking, he tears up to the clock chimes around 5pm. The clock is therefore a conditioned stimulus and there is a conditioned response of crying.
The unconditioned response to an unconditioned stimulus happens naturally(an instinct) because it is a biological response to the onions, not conditioned.
Deposits of gold can be found in the deep ocean. true?
Answer:
yes that should be true
Answer:
true
Explanation:
One study found there is only about one gram of gold for every 100 million metric tons of ocean water in the Atlantic and north Pacific
A karyotype can be used to determine the number of ____________________ (alleles, chromosomes) in a person’s cells.
Answer:
Chromosomes
Explanation:
A karyotype is an individual's collection of chromosomes
Hope this helps!
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Jayla
What is base unit used to measure volume?
Answer:
SI unit
Explanation:
the base unit of volume in the SI system is the cubic meter
Answer:
wasdwsdwasdasdhjkgchkhjck
Explanation:
gkghkghklhjljkxfjy iuipfghjgykjhgklj
A student was assigned to take water samples from a lake his home . He measured the pH of one of the water samples to be 6.0 . Which of the following best describes this sample of water ?
-highly avid
-slightly acid
-highly basic
-slightly basic
Answer: I'm guessing but I think this is the answer and also what I put in mine sorry if wrong
Explanation: I think it's "B.- Slightly Acidic" srry if it's too late-
Which statement best describes what happens when a person sees an orange t-shirt?
The t-shirt absorbs orange light from human eyes.
Human eyes reflect orange light back to the t-shirt.
Orange light reflected from the t-shirt enters human eyes.
Orange light absorbed by the t-shirt is perceived by the human eyes.
Answer:
The correct answer is - Orange light reflected from the t-shirt enters human eyes.
Explanation:
Human eyes and brain are altogether able to detect the color of the object by translating the light which is reflected by the object and transmitted by the light receptors in the eyes ad brain translate light to color.
The objects are able to absorb some colors and reflect others on the basis of their wavelength, The reflected colors are detected by our eyes and brain and objects appear to be a particular color. like here, the orange color is reflected by the t-shirt and enters in human eyes.
Answer:
its c
Explanation:
How many total chlorine atoms are in the formula 4NaCl
Answer:
4 Chlorine atons
Explanation:
4 molecules of NaCl
In NaCl we have only 1 atom of Cl
Therefore in 4 molecules, we have 4 atoms of Cl.
please mark brainliest
There are a total of 4 chlorine atoms in 4 NaCl.
ATOMS:
Atoms is the smallest indivisible particle of an element. An element consists of the same type of atom. To get the number of atoms in an element or compound, we multiply the the number of moles in the element or compound by the number of atoms of the specific element. NaCl consists of sodium and chlorine elements. 4NaCl means there are 4 moles of sodium chloride (NaCl). This means that there are 4 × 1 = 4 atoms of chlorine.Learn more at: https://brainly.com/question/657632?referrer=searchResults
Lithium-6 is 7% abundant and Lithium-7 is 93% abundant. What is the average atomic mass with the correct significant figures?
O 7 amu
O 6.9 amu
O 6.93 amu
O 6 amu
Answer:
Average atomic mass = 6.93 amu.
Explanation:
Given data:
Percent abundance of lithium -6 = 7%
Percent abundance of lithium - 7 = 93%
Average atomic mass of Li = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (7×6)+(93×7) /100
Average atomic mass = 42+ 651 / 100
Average atomic mass = 693/ 100
Average atomic mass = 6.93 amu.
Calculate the pH of substance one if it has an [OH-] that is equal to 3.2* 10^-8
Answer:
pH = 6.5
Explanation:
Given data:
pH of substance = ?
[OH⁻] concentration = 3.2×10⁻⁸
Solution:
pOH = -log[OH⁻]
pOH = -log[3.2×10⁻⁸]
pOH = 7.5
we know that,
pH + pOH = 14
pH = 14- pOH
pH = 14 - 7.5
pH = 6.5
How did Thomson's discovery of neon's isotopes lead to the discovery of neutrons?
Answer:
Neon consisted of atoms of two different masses but chemically alike. ... Movement of electrons between energy levels in atom must absurb just a certain amount energy to move to higher level can't hover between levels.
the forces that moves against movement
Answer:
Friction
Explanation:
Al(s) + HCl(aq)→AlCl3(aq) + H2(g) Balance the equation.
Answer:
2Al(s) + 6HCl(aq)→2AlCl3(aq) + 3H2(g)
Hey ima Girl What event is Caused by Gravity
Answer:
D. The water enters an aquifer through infiltration.
Explanation:
Hope it helps you:)
would you like to be my friend?:)
which three statements giving brainluiest
Answer:
will you be my Gf?:)
I am ready to be your gf:)
What did sewage treatment in Ancient Rome and 19th century London have in common? How effective was this strategy and why?
Why is human waste hazardous when it enters the water system?
Where does the material that enters a septic system end up and why?
What is now done to wastewater that was not done until more recently?
In what way are the two ways of treating sewage really just ways of recycling?
Yea pretty much
Explanation:
why can molecules made of three atoms have a bent or linear shape?
Answer:
Bent = Linear but bent due to the Lone Pairs that it contains, the more Lone Pairs the greater the bent and the smaller the degree. It is 3 atoms total.
The discussion on bent/linear shape, and its further calculation can be defined as follows:
Linear form molecules containing atoms arranged inside a straight line.Molecules having linear electron-pair geometries have sp hybridization so at central atom.Bend molecular geometry, often called angular or V-shaped, relates to molecules that have a non-collinear organization of 2 adjacent bonds.Bent = Linear however bent given the presence of Lone Pairs; more the Lone Pairs, then higher the bent as well as the smaller its degree. This consists of 3 atoms in total.Learn more:
brainly.com/question/2871827
Which elements likely conduct electricity well ?
Check all that apply
Chromium
Iodine
Carbon
Calcium
Osmium
Answer:
Chromium, calcium, and osmium
Explanation:
These elements are metals, considering this, these elements electron shells(orbitals) are further away from the nucleus, with this, their attractions are not as strong as non-metals, so some of their electrons are able to move freely.
When you accumulate many atoms, these metals can form a "sea of electrons" because they all have loose electrons interacting with each other. This allows easy conduction of heat and electricity.
Answer:
Chromium
Calcium
Osmium
Explanation:
The elements likely conduct electricity well are chromium, calcium and osmium. As these are metals and are observed to be good conductors of heat and electricity. They have extra electrons to donate and hence flow of electrons cause them to be a good conductor of electricity. Rest iodine is a non-metals which is not good conductors of electricity. Carbon is not itself a good conductor but one of its allotrope which is graphite is a good conductor of electricity.
In glucose (C6H12O6)
The simplified ratio of C atoms to H atoms is...
__:__.
Answer:
1:2:1 or just 1:2
The molecular formula is C6H12O6 because one molecule actually contains 6 C, 12 H, and 6 O atoms. The simplest whole-number ratio of C to H to O atoms in glucose is 1:2:1,
Explanation:
What is true of boric acid?
PLEASE HELP
Be sure to answer all parts.The equilibrium constant Kc for the reaction below is 61.5 at a certain temperature. H2(g) + I2(g) ⇆ 2HI(g) If you start with 0.155 M hydrogen iodide, what will the concentrations of H2, I2, and HI be at equilibrium?
Answer:
[tex][I_2]=[H_2]=0.0157M[/tex]
[tex][HI]=0.124M[/tex]
Explanation:
Hello!
In this case, for the undergoing chemical reaction, we can write the equilibrium expression as shown below:
[tex]Kc=\frac{[HI]^2}{[I_2][H_2]}[/tex]
However, since the reactions starts with 0.155 M hydrogen iodide, we need to invert the reaction as well as the equilibrium expression:
[tex]2HI\rightarrow I_2+H_2[/tex]
[tex]\frac{1}{Kc}=0.0163 =\frac{[I_2][H_2]}{[HI]^2}[/tex]
And each concentration at equilibrium in terms of the reaction extent is:
[tex][I_2]=[H_2]=x[/tex]
[tex][HI]=0.155-2x[/tex]
Thus, plugging in the new expression we write:
[tex]0.0163 =\frac{x*x}{(0.155-2x)^2}[/tex]
Which has the following valid solution for [tex]x[/tex]:
[tex]x=0.0157M[/tex]
Because the other solution is negative. Therefore, the concentration of hydrogen, iodine and hydrogen iodide at equilibrium turns out:
[tex][I_2]=[H_2]=0.0157M[/tex]
[tex][HI]=0.155-2(0.0157)=0.124M[/tex]
Best regards!
At the equilibrium, the concentration of hydrogen and iodine has been 0.0157 M each, and the concentration of HI will be 0.124 M.
The initial concentration of the reactant has been 0.155 M. From the balanced chemical equation, the ICE table will be:
HI [tex]\rm H_2[/tex] [tex]\rm I_2[/tex]
I 0.155 0 0
C -2x x x
E 0.155 - 2x x x
The value of the equilibrium constant can be given by the ratio of the concentration of products to the reactant.
The equilibrium constant for the reaction will be:
[tex]\rm k_c\;=\;\dfrac{[H_2]\;[I_2]}{[HI]^2}[/tex]
The given constant value has been for the opposite reaction. Thus the constant for the required reaction has been :
[tex]\rm \dfrac{1}{given\;k_c} \;=\;\dfrac{[H_2]\;[I_2]}{[HI]^2}[/tex]
[tex]\rm \dfrac{1}{61.5}[/tex] = [tex]\rm \dfrac{(x)\;(x)}{(0.155-2x)^2}[/tex]
0.0162 = [tex]\rm \dfrac{x^2}{(0.155-2x)^2}[/tex]
By simplyfying the equation,
x = 0.0157 M
At the equilibrium, the concentration of hydrogen and iodine has been 0.0157 M each.
The concentration of HI will be:
HI = 0.155 - 2x
HI = 0.155 - 2(0.0157)
HI = 0.124 M.
For more information about the equilibrium constant, refer to the link:
https://brainly.com/question/10038290
A
student lifts a backpack
straight up with a force of
53.5 N for a distance of 0.65 m.
How much work is done on
the backpack
Answer:
53.5 N?
Explanation:
34.77 Joules of work is done on the backpack.
How work-done is calculated?Work-done on any body can be calculated as:
W = F × x, where
F = force
x = displacement or distance
In the question, given that
Force to lift a backpack = 53.5 N
And distance = 0.65 m
Now work-done is calculated as:
W = 53.5 × 0.65 = 34.77 Joules
Hence, 34.77J of work is done.
To learn more about work-done, visit the below link:
https://brainly.com/question/26369337
A teacher did an experiment to show the movement of particles in solids, liquids, and gases. The experiment is shown below. The teacher pulled the string attached to the stretched balloon, first slowly. Then fast and finally vigorously
Answer:
This question is incomplete. However, the completed question is below
A teacher did an experiment to show the movement of particles in solids, liquids, and gases. The experimental set-up is shown below: An inverted glass jar is shown. Small circles representing foam balls are shown inside the jar. A stretched balloon is shown tied at the mouth of the jar. A string is shown drawn out from the middle of the stretched balloon. A hand is shown pulling the drawn out string. The teacher pulled the string attached to the stretched balloon, first slowly, then fast, and finally vigorously. Which of the following is most likely correct about the pulling of the string and the corresponding state of matter being represented? (a) Gas is represented when pulled fast, solid when pulled slowly, liquid when pulled vigorously. (b) Gas is represented when pulled slowly, liquid when pulled fast, solid when pulled vigorously. (c) Solid is represented when pulled slowly, liquid when pulled fast, gas when pulled vigorously. (d) Solid is represented when pulled vigorously, liquid when pulled fast, gas when pulled slowly.
The correct answer is C
Explanation:
These question has to do with the "freedom" of particles in each state of matter. In solids, the particles are compact and do not move freely within the solid molecule hence the reason for the definite shape of solid. The particles of liquids move more freely than solid but not as much as gases, hence the reason for there free flowing nature. Particles of gases move more fast and rapidly; colliding against one another and the wall of the container.
From the above description, it can be deduced that to illustrate these particles the teacher will have to represent the particles of the solid as been moved slowly, particles of the liquid will be pulled fast and that of gas will be pulled vigorously using balloons. Thus, the correct option is C
Answer:
the correct answer is c!
Explanation:
Solid is represented when pulled slowly, liquid when pulled fast, gas when pulled vigorously.