I think the answer is number (4)
Which statement describes vascular plants?
Answer:
A vascular plant is any one of a number of plants with specialized vascular tissue. The two types of vascular tissue, xylem and phloem, are responsible for moving water, minerals, and the products of photosynthesis throughout the plant.
Explanation:
what is the molecular formula if the emperical formula C2H5 and the molcuar molar mass is 58.14 g/mol0
Answer:
C4H10
Explanation:
Remark
Every periodic table is different. I'm going to use approximate numbers.
Emperical Formula Mass
2C = 2 * 12 = 24
H5 = 5 1 5
Emperical Formula Mass = 29
Solution
To get the molecular Molar Mass, you use
Molecular Molar Mass = number of mol of each constituent * empirical molar mass
Molecular mass = 58.14 rounded to 58
empirical mass = 29
moles = constitutent = ?
58 = 29 * mols constituent Divide by 29
2 = moles constituent
Answer
(C2H5)_2
C4H10
Which group of organisms make their own food?
autotrophs
humans
heterotrophs
animals
What is the balanced equation of Na2S+CuSO4=CuS+Na2SO4?
According to the Bohr model, what period and group would the element be in on the Periodic Table?
Answer:
Group: 16 Period: 2
Explanation:
There are 8 protons, which determine that the element is Oxygen. Oxygen is in group 16 and Period 2.
10. Which of these elements is the most electronetative?
(10 Points)
Nitrogen
Calcium
Bromine
O Aluminum
Think of the different types of reactions you have learned about. How can you tell if they absorb energy or release energy, and at the molecular level, how are they different?
Answer:
Absorbed will be harder to spot than releasing because take this as it's like a tire. A tire will go smaller when it has no air compared to when it has air. But absorbed it the opposite. It gets bigger with more air and etc.
Explanation:
My answer don't copy and paste change it a little.
How many oxygen atoms are in diiodine heptoxide?
Answer:
there are seven oxygen atoms
Explanation:
look look at the prefix hept- to help you answer this question
A 0.25 mol sample of neon gas at 18 °C and 0.799
atm is heated to 49 °C. The new gas pressure is 1.11
atm. What is the change in volume of the neon gas?
Answer: The change in volume is 1.52 L
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 0.96 atm
V = Volume of gas = ?
n = number of moles
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]18^0C=(18+273)K=291K[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{0.25mol\times 0.0820 L atm/K mol\times 291K}{0.799atm}=7.47L[/tex]
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 0.799 atm
[tex]P_2[/tex] = final pressure of gas = 1.11 atm
[tex]V_1[/tex] = initial volume of gas = 7.47 L
[tex]V_2[/tex] = final volume of gas = ?
[tex]T_1[/tex] = initial temperature of gas = [tex]18^0C=(18+273)K=291K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]49^0C=(49+273)K=322K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{0.799\times 7.47}{291}=\frac{1.11\times V_2}{322}[/tex]
[tex]V_2=5.95L[/tex]
The change in volume = (7.47 - 5.95)L=1.52 L
The space occupied by the substance, solution or particle in a system is called volume. The change in volume of the neon gas is 1.52 L.
What is the ideal gas equation?The ideal gas equation is the equation that states the relation between the pressure, volume, temperature, moles and gas constant of the hypothetical gas.
The ideal gas equation of a hypothetical ideal gas can be given as,
[tex]\rm PV = nRT[/tex]
Where,
Pressure (P) of the gas = 0.96 atmThe volume of the gas = VNumber of moles (n) = 0.25 molGas constant (R) = 0.0821 Latm/ KmolTemperature (T) = 291 KFrom the above equation volume can be calculated as,
[tex]\begin{aligned} \rm V &= \rm \dfrac{nRT}{P}\\\\&= \dfrac{0.25 \times 0.0820 \times 291}{0.799}\\\\&= 7.47 \;\rm L\end{aligned}[/tex]
The combined gas equation can be shown as,
[tex]\rm \dfrac{P_{1}V_{1}}{T_{1}} = \dfrac{P_{2}V_{2}}{T_{2}}[/tex]
Where,
The initial pressure of the gas [tex]\rm (P_{1})[/tex] = 0.799 atmThe final pressure of the gas [tex]\rm (P_{2})[/tex] = 1.11 atmThe initial volume of gas [tex]\rm (V_{1})[/tex] = 7.47 LThe final volume of gas [tex]\rm (V_{2})[/tex] = ?The initial temperature of the gas [tex]\rm (T_{1})[/tex] = 291 KThe final temperature of the gas [tex]\rm (T_{2})[/tex] = 322 KSubstituting values in the above equation:
[tex]\begin{aligned}\dfrac{0.799 \times 7.47}{291} &= \rm \dfrac{1.11 \times V_{2}}{322}\\\\&= 5.95 \;\rm L\end{aligned}[/tex]
Volume change of the gas is, [tex](7.47 - 5.95)\;\rm L = 1.52\;\rm L[/tex]
Therefore the change in the volume of the neon gas is 1.52 L.
Learn more about the ideal gas equation here:
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Helpppppppppppppppppppppppppppppppppppppp
Answer:
Time and Distance
Explanation:
The equation needed to calculate speed is distance ÷ time.
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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If A is the symbol for an element, which of the following is an isotope of 15
7 A?
Is A correct ??
Answer: No It's B
Explanation:
13 = 7 so 15 = ? b because 7 + 8 = 15
I need filling the blank spots
Answer:
have you tried c
Explanation:
the chicken and I don't know if you can make it
Using the average atomic masses given inside the front cover of this book, calculate the number of atoms present in each of the following sample. a. 1.50 g of silver, Ag
b. 0.0015 mole of copper, Cu
C. 0.0015 g of copper, Cu
d. 2.00 kg of magnesium, Mg
e. 2.34 oz of calcium, Ca
f. 2.34 g of calcium, Ca
g. 2.34 moles of calcium, Ca
Answer:
c. 0.0015 g of coopet, cu
Explanation:
1. Calculate the energy of interaction between a lithium ion and a magnesium ion at a distance of 4,55/10^-10m
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
why do reactions go faster at a higher temperature?
Answer:
1. Increasing the temperature increases the average speed of the reactant molecules
2. faster moving molecules in the warm reactants hit each other with more energy
Explanation:
Answer:
Explanation: At higher temperatures the particles can collide more often and with more energy. It makes the reaction take place more quickly.
What gas is taken in by animals in the oxygen cycle?
Answer:
oxygen-carbon dioxide cycle
Animals and plants are connected to each other by the oxygen-carbon dioxide cycle. Plants need the carbon dioxide from animals to live and animals must have the oxygen from plants to survive.
Explanation:
hope this helped !
What type of Star is this?
1. Main Sequence
2. Super Giant
3. Giant
4. White Dwarf
Answer:
#3
Explanation:
not sure but it's close to 5,100
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
2. The following are representative particles of matter: which among them
represents a covalent compound?
A. atom
B. ion
C. molecule
D. particle unit
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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1. Calculate the resistivity of the given material whose resistance is 2Ω, length and area of cross section are 15 cm and 25cm² respectedly
Answer:
0.033 Ω . m
Explanation:
This is a typical problem that can be solved with the resistivity formula.
ρ = R . A / l
where R is the resistance, A is the area and l, length of the object.
We have all the data in the statement but firstly, we need to convert the area and length in m² and m, respectively because units of ρ are Ω . m
15 cm . 1 m/100 cm = 0.15 m
25 cm² . 1m² / 10000 cm² = 0.0025 m²
We replace → R = 2Ω . (0.0025 m² / 0.15) ⇒ 0.033 Ω . m
A conductive object will be more or less resistant according to the resistivity, which increases with length and decreases with area. Furthermore, resistivity is also conditioned to temperature, where as T ° increases, resistivity increases too.
someone help please????
Answer:
A
Explanation:
Your answer is A
Answer:
A is the answer
Explanation:
which scientist made the most important discovery concerning indemnifying the sun as a star
Answer: Isaac Newton
Isaac Newton, an English scientist, lived from 1642 to 1727. In 1665 he realized that it was gravity that held the solar system together.
Explanation:
BUT YOULL NEVER BE ALONEEEE
ILL BE WITH YOU FROM DUSK UNTIL DAWWWNNNNN
ILL BE WITH YOU FROM DUSK TILL DAWN
ILL HOLD U WHEN THINGS GO WRONG
ILL BE WITH U FROM DUSK TIL DAWN
ILL BE WITH U FROM DUSK TIL DAWNNNNN
I NEED HELP WIT QUESTION THREE
Answer: 2.00
Explanation:
2 rounded to the nearest hundredth is 2.00
your welcome :)
answers for all three:
1. 4.00
2. 16.04
3. 2.00
The list shows five processes that occur during digestion.
1. Tearing
II. Grinding
III. Mixing
IV. Churning
V. Rolling
Where do these processes most likely occur?
A
in the mouth
B
in the esophagus
С
in the stomach
D
in the colon
PHET Simulator
2. Add a slice of cheese, How many products are made? What are the leftovers?
Answer:
there is 1 leftover because your adding to 1... I think
Explanation:
BCL PART
<
10 of 25
Fill in the coefficients with the correct numbers to create a balanced equation,
Al + _ Brg _M1Brz
0 1,21
2,3,2
4,6,4
34,3
Answer:
im not sure sorry
Explanation:
Directions: Fill in the blanks with the correct term to complete the statements.
1. Seismic waves are also known as__________
2. When the seismic waves travel deeper into the crust, the quake will__________
3. The waves that travel the fastest are_____________
4. The type of wave that travels only in solid medium is known as______________
5.______________waves, also known as L waves are the slowest waves.
6.____________releases energy that travels through and around the earth
seismic waves.
7._____________are of lower frequency than body waves.
8. One of the types of surface waves is___________which creates more shaking.
9. Primary waves can travel a velocity of
10.___________is the velocity of secondary waves.
who can answer this question correct answer please...get chance point.. and brainlest..
Answer:
1) secondary waves
2)
3) P waves
4)surace waves