Answer:
–156 °C
Explanation:
The following data were obtained from the question:
Initial temperature (T1) = –20 °C
Initial volume (V1) = 140 mL
Final volume (V2) = 65 mL
Final temperature (T2) =?
Pressure = constant.
Next, we shall convert –20 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T1) = –20 °C
Initial temperature (T1) = –20 °C + 273 = 253 K.
Next, we shall determine the new temperature of the gas as follow:
Initial temperature (T1) = 253 K
Initial volume (V1) = 140 mL
Final volume (V2) = 65 mL
Final temperature (T2) =?
V1/T1 = V2/T2
140/253 = 65/T2
Cross multiply
140 × T2 = 253 × 65
140 × T2 = 16445
Divide both side by 140
T2 = 16445 /140
T2 = 117 K
Finally, we shall convert 117 K to celcius temperature. This can be obtained as follow:
T(°C) = T(K) – 273
T2 = 117 K
T2 = 117 K – 273
T2 = –156 °C
Thus, the new temperature of the gas is –156 °C
In chemical reaction atoms are what?
Answer:
In chemical reaction atoms are reactantsis the second one or the fourth one?
Answer:
D. Light waves travel fastest through a vaccumm
Explanation:
"In a vacuum , light waves move their fastest: 186,000 miles per second (300,000 kilometers per second). This is also the fastest that anything in the universe moves. But when light waves move through air, water or glass, they slow down."
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Hopefully I could help! Good luck.
How does conduction happen?
Answer:
Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules. ... The fire's heat causes molecules in the pan to vibrate faster, making it hotter. These vibrating molecules collide with their neighboring molecules, making them also vibrate faster.
Explanation:
Calcium is an element. What is the smallest particle of calcium that has the same chemical properties of calcium?
A. an atom of calcium
B. a proton from a calcium atom
C. an electron from a calcium atom
D. a molecule that contains calcium
Answer:
A. An Atom
Explanation:
An atom is the smallest particle of an element, having the same chemical properties as the bulk element.
An atom of calcium is the smallest particle of calcium that has the same chemical properties of calcium.
What is an atom ?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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what is the correct equation for water gas
Answer:
Water-gas A mixture of carbon monoxide (CO) and hydrogen (H2) produced by passing steam over red-hot coke using the endothermic reaction C + H2O # CO + H2.
Explanation:
1. What is the flame color of sodium?
yellow-orange
purple
green
blue-green
Orange is the color of Sodium
A mixture of 10.0 g of Ne and 10.0 g Ar have a total pressure of 1.60 atm. What is the partial pressure of Ar
Answer:
0.53 atm
Explanation:
First we have to obtain the number of moles of each gas.
Number of moles of Ne = 10g/20g/mol = 0.5 moles
Number of moles of Ar = 10 g/40 g/mol = 0.25 moles
Total number of moles = 0.5 moles + 0.25 moles = 0.75 moles
Partial pressure of Ar = number of moles of Ar/Total number of moles * total pressure
Partial pressure of Ar = 0.25 moles/ 0.75 moles * 1.60 atm
Partial pressure of Ar = 0.53 atm
find the percent yield,if 6.0g of Licl are actually produced and the theoretical yield is 35.4g of Licl.
Answer:
Percent yield = 17%
Explanation:
Given data:
Actual yield of lithium chloride = 6.0 g
Theoretical yield of lithium chloride = 35.4 g
Percent yield = ?
Solution:
Formula:
Percent yield = (actual yield / theoretical yield )× 100
Now we will put the values in formula.
Percent yield = (6.0 g/ 35.4 g)× 100
Percent yield = 0.17 × 100
Percent yield = 17%
An observation that deals with numbers is a(n)
A. Prediction
B. Quantitive observation
C. Evaluation
D. Qualitative observation
Answer:
B (Quantitative)
Explanation:
a clever way to remember the difference between quantitative and qualitative is that there is a n in quantitative which is the first letter to the word number. So quantitative is an oberservation with numbers
According to the atomic model for matter when atoms are heated they move faster. This causes the rate of reaction to change because the atoms
become larger.
have a better chance of colliding with other atoms.
multiply.
stop moving.
B.) have a better chance of colliding with other atoms.
what is the potentual energy of 7 kg object, 12 m off the ground?
Answer:
823.2 J
Explanation:
PE = mgh
= (7 kg) (9.8 m/s^2) (12 m)
= 823.2 J
Answer:
Required Answer:-Mass=m=7kg
Height=h=12m
Gravitational force=g=10m/s^2
As we know that[tex]{\boxed{\sf Potential\:energy{}_{(P.E)}=mgh}}[/tex]
Substitute the values[tex]{:}\longmapsto [/tex][tex]\sf P.E=7×12×10 [/tex]
[tex]{:}\longmapsto [/tex][tex]\sf P.E=84×10[/tex]
[tex]{:}\longmapsto [/tex][tex]\sf Potential\:energy=840Joule [/tex]
What is the enrgy change when the temperature of 14.4 grams of solid alumnum is decreased from 39.5°C to 23.0°C?
Answer:
[tex]Q=-213.84J[/tex]
Explanation:
Hello!
In this case, since energy involved when a substance undergoes a temperature change due to heat addition or removal is computed as shown below:
[tex]Q=mC\Delta T[/tex]
As the aluminum has a specific heat of 0.900 J/g°C and 14.4 g underwent such temperature decrease, the energy change is:
[tex]Q=14.4g*0.900\frac{J}{g\°C}(23.0\°C-39.5\°C)\\\\Q=-213.84J[/tex]
Which is an outlet energy flow.
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10. For each of the following pairs of ionic compounds, state which would be expected to have the higher (more negative) lattice energy.
a. LiF or KBr
b. NaCl or MgS
c. MgO or RbI
Answer:
C I belive
Explanation:
The higher lattice energy in option a is for LiF. Similarly, MgS have higher lattice energy that NaCl and MgO have higher lattice energy than RbI.
What is lattice energy?Lattice energy of a compound is the energy required to convert one mole of that compound into its constituent gaseous ions. Lattice energy increases as the size of the ion decreases. As well as, higher the charge of the ions higher will be the lattice energy.
In LiF and KBr, Li and F are the smaller ions and is having higher lattice energy. In the case of NaCl and MgS, Mg and S are having +2 charge and are smaller causes MgO higher in lattice energy.
Similarly in the case of MgO and RbI the same concept can be applied. Rb⁺ and I⁻ are bigger ions where as Mg²⁺ and O²⁻ are comparatively smaller and have higher charge result in higher lattice energy.
Thus compound which have higher lattice energy in option a is LiF, in option b is MgS and in option C is MgO.
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Human blood has a molar concentration of solutes of 0.30 M. What is the osmotic pressure of blood at 25°C?
Answer:
π = 7.33atm
Explanation:
Osmotic pressure is defined as the pressure that must be applied to stop the mass transfer when a semipermeable membrane separates it of pure water. The equation is:
π = M×R×T
Where P is osmotic pressure
M is molar mass = 0.30M
R is gas constant = 0.082atmL/molK
And T is absolute temperature = 25°C + 273.15 = 298.15K
π = 0.30M×0.082atmL/molK×298.15K
π = 7.33atmOsmotic pressure of human blood at 25 degree C or at absolute temperature is equal to 7.33 atm.
What is osmotic pressure?
It is defined as the minimum pressure exerted on the solution, which is required to stop the flow of pure solvent from low concentration to high concentration through the semi permeable membrane.
Osmotic pressure can be calculted as :
P = M × R × T
Where, P = Osmotic pressure
M = Molar mass = 0.30 M (given)
R = Universal gas constant = 0.082 atmL/molK
T = Absolute temperature 25 degree C = 25⁰C + 273.15 = 298.15 K
Putting all these values in the given equation, we get:
P = 0.30 × 0.082 × 298.15 = 7.33 atm
Hence, 7.33 atm is the osmotic pressure of blood at 25⁰C .
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Luca made the following chart for Earth’s four basic movements. What needs to be correct on his chart? Rotation Speed Revolution Speed Solar System Speed Milky Way Speed 0.3 miles/sec 18.5 miles/sec 370 miles/sec 150 miles/sec The solar system speed and Milky Way speed should be switched. The rotation speed and revolution speed should be switched. The revolution speed and solar system speed should be switched. The rotation speed and Milky Way speed should be switched.
Answer:The Solar System speed and Milky Way speed should be switched
Explanation:
The Milky Way speed and solar system speed should be switched with each other. Therefore, option (A) is correct.
What is the speed of the earth's revolution and rotation?The rotation of the earth can be described as the spinning of the Earth around its own axis. The axis has an angle of 23(1/2)° and it is perpendicular to the plane of the orbit of the earth. The northern and southern hemispheres lean in a direction away from the Sun because Earth is tilted on its axis. The rotation speed of the earth is 0.3 miles/sec.
The Revolution of the earth is the movement of the Earth around the Sun in a fixed path. The revolution speed of the earth is 30 Km/s or 18.5 miles/sec. The milky way speed of the earth is 370 miles/sec and the solar system speed of the earth is 130 miles/sec.
But according to Luca's chart, the milky way speed is 150 miles/sec and the solar system speed is 370 miles/sec.
Therefore, the solar system speed and Milky Way speed need to be switched.
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Calculate the mass in grams of 0.0035 mol of NaNO3
Answer:
The Mass in Grams= 0.5145
Explanation:
The atomic mass of Na=23
The atomic mass of No3= 62
we multiply 0.0035×((23×1)+(62×2)) = 0.5145 grams
Why is it necessary to cool a hot , supersaturated solution slowly during a recrystallization?
Answer:
This is because, the is less chance of trapping impurities in the developing crystal lattice
Answer:
injuries
Explanation:
bc it will burn your hands
Which of the following is composed of elements combined in a specific ratio?
Answer:
compound
Explanation:
A yellow line occurs at 572.8 nm in the emission spectrum of phosphorus. What amount of energy, in joules, must be released by an electron in a phosphorus atom to produce a photon of this light?
Answer:
3.47 × 10⁻¹⁹ J
Explanation:
A yellow line occurs at 572.8 nm in the emission spectrum of phosphorus. When an electron undergoes this process, it requires an amount of energy to produce a photon of this light. We can calculate the energy (E) using the following expression.
E = h × c/λ
where,
h: Planck's constant (6.63 × 10⁻³⁴ J.s)c: speed of light (3.00 × 10⁸ m/s)λ: wavelength (572.8 nm = 5.728 × 10⁻⁷ m)E = 6.63 × 10⁻³⁴ J.s × 3.00 × 10⁸ m/s/5.728 × 10⁻⁷ m
E = 3.47 × 10⁻¹⁹ J
SOMEONE PLEASE HELP
Answer:
6. 7870 kg/m³ (3 s.f.)
7. 33.4 g (3 s.f.)
8. 12600 kg/m³ (3 s.f.)
Explanation:
6. The SI unit for density is kg/m³. Thus convert the mass to Kg and volume to m³ first.
1 kg= 1000g
1m³= 1 ×10⁶ cm³
Mass of iron bar
= 64.2g
= 64.2 ÷1000 kg
= 0.0642 kg
Volume of iron bar
= 8.16 cm³
= 8.16 ÷ 10⁶
[tex] = 8.16 \times 10^{ - 6} \: kg[/tex]
[tex]\boxed{density = \frac{mass}{volume} }[/tex]
Density of iron bar
[tex] = \frac{0.0642}{8.16 \times 10^{ - 6} } [/tex]
= 7870 kg/m³ (3 s.f.)
7.
[tex]\boxed{mass = density \: \times volume}[/tex]
Mass
= 1.16 ×28.8
= 33.408 g
= 33.4 g (3 s.f.)
8. Volume of brick
= 12 cm³
[tex] = 12 \times 10^{ - 6} \: m^{3} \\ = 1.2 \times 10^{ - 5} \: m ^{3} [/tex]
Mass of brick
= 151 g
= 151 ÷ 1000 kg
= 0.151 kg
Density of brick
= mass ÷ volume
[tex] = \frac{0.151} {1.25 \times 10^{ - 5} } \\ = 12600 \: kg/ {m}^{3} [/tex]
(3 s.f.)
Vitamin C contains the elements C, H, and O. It is known to contain 40.9% C and 4.58% H by mass. The molar mass of vitamin C has been found to be about 180 g/mol. The molecular formula for vitamin C is _________
Answer:
C₆H₈O₆
Explanation:
First off, the percent of oxygen by mass of vitamin C is:
100 - (40.9+4.58) = 54.52 %Assume we have one mol of vitamin C. Then we would have 180 grams, of which:
180 * 40.9/100 = 73.62 grams are of Carbon180 * 4.58/100 = 8.224 grams are of Hydrogen180 * 54.52/100 = 98.136 grams are of OxygenNow we convert each of those masses to moles, using the elements' respective atomic mass:
C ⇒ 73.62 g ÷ 12 g/mol = 6.135 mol C ≅ 6 mol CH ⇒ 8.224 g ÷ 1 g/mol = 8.224 mol H ≅ 8 mol HO ⇒ 98.136 g ÷ 16 g/mol = 6.134 mol O ≅ 6 mol OSo the molecular formula for vitamin C is C₆H₈O₆
The diagram illustrates the water cycle.
Parts of the water cycle labeled U through Z. U: Water moving from a lake into the clouds. V: Clouds. W: Water falling from clouds as rain and snow. X: Water moving from ground to the clouds. Y: Water flowing down the mountainside into a lake. Z: Underground water going into lake.
Which process occurs at location W?
precipitation
evaporation
condensation
transpiration
Answer:
Precipitation
Explanation:
In the water cycle, water experiences different phase changes from one state to another in nature.
The cycling affords water to in solid, liquid and the vapor form.
From the cycle show, W represents precipitation.
During precipitation, water in the atmosphere begins to fall. U is evaporationX is transpiration. V is the condensation.Answer:
precipitation
Explanation:
In what phase is CO2 at 4 atm and -10°C is liquid, gas or solid? Starting from the same point, 4 atm and −10 °C, what phase change would eventually result from an increase in pressure?
a. vaporization
b. sublimation
c. freezing
d. deposition
e. melting
f. condensation
Answer:
(f).Condensation
CO2 exist as gaseous state at -10degree 4atm pressure and will become liquid upon increasing the pressure
Explanation:
Using The phase diagram of CO2 we observe that
Carbon dioxide at -10degree Celsius and 4atm pressure will be in
Gaseous phase. Starting from the same point, 4atm and -10degree Celsius upon increasing the pressure the Carbon dioxide will change into liquid phase above 5.11atm pressure, this happened due to Condensation.
Therefore CO2 exist as gaseous state at -10degree 4atm pressure and will become liquid upon increasing the pressure till 5.11stm.
The carbon dioxide has been existing in the gaseous state and with condensation, it has been converted to the liquid state. Thus, option F is correct.
The state of the gas at a particular pressure and temperature can be assessed from the phase diagram.
The state of Carbon dioxide at 4 atm and [tex]\rm -10^\circ C[/tex] have been the gaseous state.
The increase in pressure results in the decrease in the volume of the gas, as the pressure has been increased, the molecules will condense and result in the conversion of the gaseous state to the liquid state.
The carbon dioxide has been existing in the gaseous state at 4 atm and [tex]\rm -10^\circ C[/tex]. With the increase in pressure, the state of the gas has been changed to liquid due to condensation. Thus option F is correct.
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11. Which branch of chemistry is concerned with the behavior of substances?
Biochemistry
Physical
Inorganic
O Organic
Answer:
Physical
Explanation:
The density of krypton gas at 1.35 atm and 54.1°C is ________ g/L.
a. 4.21
b. 0.304
c. 8.42
d. 0.0503
e. 0.237
a.
Explanation: I saw it on another website.
How many valence electron does sulfur
Explanation:
Sulfur has 6 valence electron
Valence electron shows group( in column)
A scientist is measuring how quickly different liquids flow
down a ramp. She notices that water flows more easily
than dish soap.
Which property of water is the scientist observing?
A. Viscosity
B. Compression
C. Crystalline structure
D. Surface tension

Answer:
I think its A
Explanation:
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Which process is shown in the diagram?
0,
ing
CO, +H,0
Chloroplast
Mitochondrion
Sugar
Heat
o
ATP
Respiration
The cellular respiration process, which generates ATP as the final result, employs oxygen and sugar as reactants. So, the correct option is A.
What is Cellular respiration?Cellular respiration is the process by which organisms combine oxygen with food molecules, channeling the chemical energy from those resources into life-sustaining activities while eliminating carbon dioxide and water as waste.
Both oxygen and glucose are reactants in the mobile respiratory system. ATP is the primary component of mobile respiration; waste products include carbon dioxide and water.
Oxygen might be present or absent while cells are respiring. Nonetheless, the activity is essentially known as "cellular respiration" because the cell seems to "respire" by consuming molecular oxygen (as an acceptor of electron) and exhaling carbon dioxide (as an end product).
Therefore, the correct option is A.
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Your question is incomplete, most probably the complete question is:
The process shown in the diagram produces oxygen and sugar. Which
process uses oxygen and sugar as reactants?
Chloroplast
Mitochondrion
Sugar
CO, +H,0
ATP
Heat
Respiration
A. Cellular respiration
B. Water cycle
c. Transpiration
D. Photosynthesis
What type of reaction is Cl2+2NaBr=NaCl+Br2
Answer:
Displacement reaction
The equation 2NaNO3 + CaCl2 - 2NaCl + Ca(NO3)2 is balanced. How many atoms
of sodium (Na) are there on either side of the equation?
one
two
four
six
Answer:3
Explanation:
I took the test
the correct answer is two