Answer:
+1
Explanation:
Need help ASAP!!!!
Which of the following represents a chemical change?
A. Rocks being smoothed by rapid water movement
B. The pink color of a rose
C. Iron's attraction to a magnet
D. Decomposition of stone due to acid rain
Answer:
D.
Explanation:
Decompostion of stone due to acid rain
Answer:
D
Explanation: the rest are either traits or physical changes
D is a chemical reaction
Which expressions are equal to 675? 700 – 25 O 700 – 75 O 600 + 75 O 634 + 31 500 275
Answer:
30
Explanation:
Answer:
The first one, The third one.
700-25, 600+75!
Explanation:
Liquid Mercury has a density of 13.55 g/cm3 at room temperature (20.0 ° C).
You are trying to design a container to hold a 3.40 X 104 mg sample of mercury.
This mercury expands at 1.11 μl (microliter) per degree it is heated.
What is the minimum volume ( in liters) of the container if you want the sample to be able to be heated to 200.0 ° C? (Assume that the sample starts at room temperature.)
If this was in a sealed tube with a diameter of 0.550 cm, how tall(in cm) would the tube need to be to hold the mercury through these temperature changes? [ V= π r2h (cylinder) ] Please show your work!
Answer:
A long glass tube with one end open and the other end sealed was completely filled with mercury, then it was stood on end with the open end in a container filled with mercury.
If the tube is relatively short, it will still be filled with mercury all the way to the top. If it's long enough, the column of mercury will not reach the top. The air pressure on the surface of the mercury pool that the tube sits in is what supports the mercury. When the weight of a 1 cm^2 column of mercury is greater than the air pressure per cm^2, it can't be supported by that pressure. The top of the tube will have an almost perfect vacuum, with only a tiny amount of mercury vapor in it.
The height of a column of water or mercury that can be supported by air pressure depends on, and is proportional to, the density of the water or mercury.
How you're supposed to get the answers depends on what units are used to define 1 bar of pressure. Your textbook or lecture notes should give you the value and units of a bar. If you're supposed to look it up, you'll find a variety of different combinations, including 750.06 mm of Hg or 1019.72cm of H 2 O. That would actually give you the answers directly.
750.06 m m ≈ 0.75 m of H g
1019.72 c m ≈ 10.20 m of water
If you're supposed to calculate everything, you'll need to use 1 bar = 1 x 105 N / m 2. Then you'll have to look up the g r a v i t a t i o n constant and calculate the weight of a column of mercury or water. Note that g rams and k i l o g r a m s are units of mass, not weight, which is a force. The unit of force in the m e t r i c system is the N e w t o n. This is confusing because we measure weight in pounds, which is a force. Most of the rest of the world measures "weight" in k i l o g r a m s, which is really mass.
How is 1 bar defined for you?
If it's m m H g, just multiply that by 13.6 to get the height for a column of water.
If it's a force per unit area:
We can calculate the force (weight) of H. g using the g r a v i t a t i o n constant and the given density, then go from there."
Explanation:
I do not own this information
What is the molar mass for dinitrogen trioxide, N₂O₃?
(note molar mass of N =14 g/mol and O =16 g/mol
A reversible reaction is a reaction that takes place in the ___________________
. If the reaction were to _________________, the rate of the forward reaction would equal that of the reverse reaction.
Answer:
A reversible Reaction is a reaction that takes place in the (Reactants)
If the reaction Were to (Equal), the rate of the forward reaction would equal that of the reverse reaction
Explanation:
A reversible reaction is a reaction that takes place in the both direction.
If the reaction were to equilibrium, the rate of the forward reaction would equal that of the reverse reaction.
What is reversible reaction?A reversible reaction can be identified as one in which the reactants, , as well as products, react together to return the reactants to their previous form.
What is equilibrium?The phase of chemical equilibrium occurs if both reactants, as well as products, products, are occupied in concentrations that do not alter with time.
Therefore, A reversible reaction is a reaction that takes place in the both direction. If the reaction were to equilibrium, the rate of the forward reaction would equal that of the reverse reaction.
To know more about reversible reaction and equilibrium
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Which statement best helps to explain the observation that NH3(1) boils at -28°C, whereas PH: (1) boils at -126°C?
A
The dispersion forces in NH3 are weaker than the dispersion forces in PH3.
B
The dispersion forces in NH3 are stronger than the dipole-dipole forces in PHz.
С
NH3 has hydrogen bonding that is stronger than the dipole-dipole forces in PH3
D
NH3 has hydrogen bonding that is weaker than the dipole-dipole forces in PH3.
Answer:
C.
Explanation:
2. The following are representative particles of matter: which among them
represents a covalent compound?
A. atom
B. ion
C. molecule
D. particle unit
Individual solute particles are broken apart from the solid by these particles. * a Solution b Insoluble c Solvent d Compounds
Answer:
Individual solute particles are broken apart from the solid by the;
c. Solvent
Explanation:
A solution is the homogeneous mixture that is made up of two or more substances formed by dissolving a substance which can be a solid, liquid or gas in another substance known as the solvent which normally the larger part of the fraction of the solution than the solute and can also be a solid, liquid or a gas
In a solution the solvent particles serves to brake of and disperser parts of a solid solute to form a more or less homogeneous mixture
Therefore, the solute particles are broken by the solvent particles in a solution
Which star type has the shortest life span?
1. Massive blue stars
2. Supermassive blue giants
3. Medium orange stars
4. Low mass white stars
What does the word photosynthesis mean?
PIC IS BELOW!
Please help I will mark brainliest!!!
Answer:
In the order goin left to right:
kinetic energy, grav pot. energy, deceleration, speed, acceleration, potential
Explanation:
Give an example of an amorphous solid.... PLS HELP ON THIS
Macoy Inda
ns: Read and analyze each item carefully and choose and encircle the letter of the correct answ
Tven.
Which of the following is NOT a special product?
12x + 5)(2x - 5)
B. (m + 3) (m + 3)
(m. 5)(
m5)
D. (x-2)(x-2)(x-2)
What is the product of squaring the binomial (5x + 4)??
А. ЛОх2 + 16
B. 25x2 + 16
C. 25x2 + 40x + 16
D. 25x2 + 20x + 16
One of the factors of x2 + 2x – 15 is (x + 5). What is the other factor?
Arx+3)
B. (x-3)
C/(x-5)
D. (x + 5)
Which of the following gives a product of 9y2 – 16?
A. (3y + 4) (3y + 4)
B/(3y + 4) (3y - 4)
C. (3y-2)(3y - 8)
D. (3y + 2)(3y + 8)
Which of following is the product of (n-3) (n - 3)(n-3)?
. n3 – 27
B.n
3-9n2 + 27n + 27
C. n3 + 27
D. n3 + 9n2-27n - 27
Find the missing terms: (x + _) (x + _) = x2 + 18% + 81.
B. -9,-9
D. 9,9
C.) 4,4
The area of the square is t? – 18t + 81 square units. Which expression represents the ler
-4, -4
Answer:
? the question isn't clear
Explanation:
What happens when Mg forms an ionic bond?
o it gains one electron and becomes a -1 anion
o it loses one electron and becomes a +1 cation
o It loses 2 electrons and becomes a +2 cation
It shares electrons with the other atom in the bond
Look at picture
ASAP please will mark as brainlist don’t got much time
Answer:
it gains one electron and become a -2 anion...
it is the right answer..
above answer is right explanation
Why is Pepe the frog sad?!?!?!
Answer:
pepe needs kisses.
Explanation:
you want to kiss pepe. you want to soooo bad.
Answer:
his dad left to get milk and his mother commited toaster bath
Explanation:
1. Calculate the energy of interaction between a lithium ion and a magnesium ion at a distance of 4,55/10^-10m
Explain why the elements in group 7 have 7
valence electrons.
Answer:
The periodic table was made that way by the scientists who created it
Explanation:
to make things easier for the users.
Which of the following models a single replacement reaction?
Using the amount of each element you calculated in part A, calculate the ratios of the elements to each other to determine the empirical formula.
Select the correct answer from each drop-down menu to complete the empirical formula.
Answer:
C2H6O1
Explanation:
Divide the number of moles of each element by the smallest number of moles, which is 9.69 moles.
Divide the number of moles of carbon by 9.69:
19.3 mol/ 9.69 mol ≈ 2.
Divide the number of moles of hydrogen by 9.69:
57.5 mol/ 9.60 mol ≈ 6.
Divide the number of moles of oxygen by 9.69:
9.69 mol/ 9.69 mol = 1.
So, the empirical formula of the unknown compound is C2H6O.
I need filling the blank spots
Answer:
have you tried c
Explanation:
the chicken and I don't know if you can make it
please answer fast! Which of the following statements are false?
A: In a chemical change, atoms are rearranged to make new compounds.
B: The same element is present before and after a chemical change.
C: A physical change does not produce an entirely new substance.
D: A chemical property can be observed without changing the identity of the substance.
I believe it is C.
Hope this helps!
What can describe the form of precipitation
Do you have a picture/answer choices?
Some forms of precipitation are rain, sleet, snow, and hail, if that's what you were asking for.
What is the name for the layer of electrically charged particles that allows radio waves to travel across the country and which atmosphere layer is it found in?
Answer:
Electrons are the electrically charged particles u r looking for
Which type of weathering occurred to form the Malham Pavement
Answer:
carbonation
Explanation:Please dont delete my answer again cause its correct, I had the same question on my test so I know its righ!!!!
Help please and thank you
Crest
hope that helps^^
Tori completed an experiment to see what happens to differently charged objects when they come close to each other. Based on the observations that she collected, her teacher told her there is an error in her table. How can Tori correct her table?
A table with two columns. The first row is the headings of the table. The first column is labeled electrically charged objects and the second column is labeled attract or repel. In the first column, second row, there is an image of a beach ball with a negative charge on it and a dress with a positive charge on it. In the second column, second row, is attract. In the first column, third row, there is an image of a t shirt with a negative charge on it and a beach ball with a negative charge on it. In the second column, third row, is attract. In the first column, fourth row, there is an image of a t shirt with a negative charge on it and a glove with a negative charge on it. In the second column, fourth row, there is repel. In the first column, fifth row, is an image of a chair with a positive charge on it and a dress with a positive charge on it. In the second column, the fifth row is attract.
Answer:
A negatively charged T-shirt and a negatively charged beach ball will repel each other, so Tori should change "attract" to "repel" for these objects.
Explanation:
If the concentration of sugar in water is determined to be 45 g/100 ml and 135 g of sugar was used to make the solution how much water was used?
Answer:
300g of water was used to make the solution
Explanation:
In the sugar solution, there are dissolved 45g of sugar in 100mL of water. The conversion factor is 45g Sugar = 100mL water. That means when 135g of sugar are used the amount of water is:
135g sugar * (100mL water / 45g sugar) =
300g of water was used to make the solutionWhat charge would you expect for an formed by P?
O +2
0-2
O +3
O-3 Look at picture
ASAP please will mark as brainlist don’t got much time
Describe what happens inside a CD
player when you listen to an audio CD.
The thing that happens inside a CD player when you listen to an audio CD is that laser beam turns on and scans along a track with the photocell from the CD's center.
What are semiconductors?The electrical conductivity of a semiconductor material is between that of a conductor, such as metallic copper, and that of an insulator, such as glass.
A small photoelectric cell and a smaller laser beam (called a semiconductor diode laser) are found inside your CD player (an electronic light detector). When you hit play, the disc is rotated at a high speed by an electric motor (not visible in this figure) (up to 500rpm).
The laser beam turns on and scans along a track with the photocell from the CD's center to its edge (in the opposite way to an LP record). As the laser/photocell scans from the center to the periphery of the disc, the motor gradually slows it down (as the track number increases, in other words).
Hence laser beam turns on and scans along a track with the photocell from the CD's center.
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What happens to glucose in the body of a healthy person put steps
Answer:
the stomach and small intestine absorb the glucose and then release it into the bloodstream once in the bloodstream glucose can be used immediately for energy