Ice melts to form water. And water freezes to form ice. Choose the TRUE statement about these changes.
A. Both melting and freezing are physical changes.
B. Both melting and freezing are chemical changes.
C. Melting is a physical change while freezing is a chemical change.
D. Melting is a chemical change while freezing is a physical change.
Answer:
A. Both freezing and melting are physical changes.
Explanation:
Even if you were to freeze water, the molecules are still water molecules, and vise versa with melting it.
Answer: Option A) Both melting and freezing are physical changes.
Explanation:
A physical change is one which is easily reversible and in which no new substances are formed.
Hence, since ice melts to form water (melting), and water freezes to form ice back (freezing), both melting and freezing are easily reversible and do not form new products.
Thus, both melting and freezing are physical changes.
1. What is a physical change?
(10 Points)
O
A. A new substance is formed.
O
B. A substance is altered in size, shape or form.
O
C. Something has to break.
O
D. Something has to be folded.
What aboaieloben
Answer B
Explanation:
A Physical change is a change in one or more physical properties of matter without any change in chemical properties. For example physical change include changes in the size shape of matter.
4. A simple sugar's properties result from
a. Its ratio of amylose to amylopectin
b. How atoms are arranged in its molecules
C. The type of plant that produced it
d. The degree of crystallization
Answer:
b. how atoms are arranged in it's molecules
What determines the size of an ocean wave?
a. the wave's color
b. the wave's temperature
c. the wave's speed
d. the wave's energy
20 pts :p will mark brainliest too.
I = Increase.
D = Decrease.
With the grass it'll decrease because more rabbits means more grass being eaten. With the animals the more rabbits there are the more food there is for them which means they more they can feed children and keep repopulating. And halving the rabbit population would be opposite I'd assume.
According to the chart, which substance has the lowest OH' concentration?
A)
urine
lemon juice
tomato juice
D)
black coffee
Answer:
lemon juice
Explanation:OH is in bases and lemon juice is an acid
Why does a noise sound fainter as you move away from its source?
Answer:
Uhh..Because as you get farther away then you cant hear the sound waves i think
Explanation:
Answer:
because the sound waves can only travel so far and if there is things near the source the waves bounce off of it. Ex: the speaker in the class room wouldn't be quiet, its like the noise went away as i walked down the halls, maybe the walls were blocking the noise
Explanation:
If the Dry bulb reads 25 degrees Celsius and the wet bulb reads 22
degrees Celsius. Is the relative humidity high or low? How do you know?
Answer:
Relative humidity is low .
Explanation:
The wet bulb reads low temperature because due to low humidity of atmosphere , evaporation of water takes place from the wet bulb which makes the bulb cool and therefore it reads lower temperature . In the process of evaporation , heat equal to latent heat of vaporization is taken from the bulb and it loses temperature.
3.25 * 10 ^ 24 molecules of dinitrogen pentoxide would be how many moles?
Answer: 5.4 moles
Explanation:
Dinitrogen pentoxide has a chemical formula of N2O5
Now, based on Avogadro's law:
1 mole of any substance has 6.02 x 10^23 atoms
So, 1 mole of N2O5 = 6.02 x 10^23 molecules
Z moles of N2O5 = 3.25 x 10 ^ 24 molecules
To get the value of Z, cross multiply:
(3.25 x 10^24 molecules x 1mole) = (6.02 x 10^23 molecules x Z moles)
3.25 x 10^24 = (6.02 x 10^23 x Z)
Z = (3.25 x 10^24) ➗ (6.02 x 10^23)
Z = 5.4 moles
Thus, there are 5.4 moles of Dinitrogen pentoxide.
Answer:
5.39
full answer: 5.396878114
Explanation:
divide 3.25*10^24 over 6.022*10^23(which is a mole of anything in particles)
What net ionic equation describes the reaction that occurs when AI2(SO4)3(aq)andNa3PO4(aq)are mixed together?
Answer: chemical reaction
Explanation:
Al3+(aq)+PO4^3-(aq)+3SO4^2-(aq0 --> 3AlPO4(s)+3Na+(aq)
Can someone please answer at least a few or something.I struggling out here since I’m dumb
Answer:
3. Group
5. Valence electron
6. The atomic number tells you the presence of proton and electron.
Explanation:
The electrons which are present in the last shell or orbit is called valence electron and the shell is valance shell. When you go from left to the right side of the periodic table, number of shells remains the same but number of electron increases while when we go from top to bottom of periodic table, number of shell increases but the number of valance electrons remains the same.
Which term identifies a factor that will shift a chemical equilibrium?
Answer:
Temperature
Explanation:
Temperature is identified as a factor which will result in a shift in the chemical equilibrium.
What is Chemical equilibrium?This is defined as the point in which the concentrations of reactants and products remain constant with time.
Temperature could result in shifting the equilibrium to the left or right depending on factors such as nature of reactant etc.
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An enthusiastic car owner checks his tire pressure religiously and makes note that his tire pressure is 220 kPa in 80 degrees Fahrenheit (26.7 degrees Celsius). A strong cold front comes in and later in the week the temperature has dropped to 36 degrees Fahrenheit (2.2 degrees celsius). How can the car owner use gas laws to calculate the new tire pressure (in kPA units)?
Answer:
202 KPa
Explanation:
Step 1:
Data obtained from the question.
Initial Pressure (P1) = 220 kPa
Initial temperature (T1) = 26.7°C
Final temperature (T2) = 2.2°C
Final pressure (P2) =?
Step 2:
Conversion of the Celsius temperature to Kelvin temperature.
Temperature (Kelvin) = temperature (celsius) + 273
T1 = 26.7°C + 273 = 299.7 K
T2 = 2.2°C = 2.2°C + 273 = 275.2 K
Step 3:
Determination of the new pressure.
The new pressure of the tire can be obtained as follow:
P1/T1 = P2/T2
220/299.7 = P2/275.2
Cross multiply to express in linear form
299.7 x P2 = 220 x 275.2
Divide both side by 299.7
P2 = (220 x 275.2)/299.7
P2 = 202 KPa
Therefore, the new pressure of the tire is 202 KPa
When the temperature drops to 2.2 degrees Celsius, the tire pressure will decrease to approximately 202.1 kPa.
We can use the combined gas law which is derived from the ideal gas law. The combined gas law relates pressure, volume, and temperature without needing to know the quantity of gas, and is expressed as (P₁/T₁) = (P₂/T₂), where P₁ and T₁ are the initial pressure and temperature, and P₂ and T₂ are the final pressure and temperature.
To do so, we first convert temperatures to Kelvin by adding 273.15. Then we rearrange the formula to solve for P₂:
P₂ = P₁ x (T₂/T₁)P₂ = 220 kPa x (275.35 K / 299.85 K)P₂ = 202.1 kPaTherefore, the tire pressure will decrease to approximately 202.1 kPa.
- Which theory was the natural beginning of a Big Bang theory?
Well, the big bang theory was that the universe started to expand at and extrmly fast rate. We're talking several billion kilometers in less than a second. People think that our univers was pretty much shot out into space in a ciertain direction. During this, the univers has expanded and widen't to unimaginable size. but we really don't know what happend, and we may never find out. Who knows?
According to the traditional Big Bang theory, the universe's creation involved a singularity, a region of infinite density and temperature whose nature is difficult for humans to comprehend.
What is big bang theory ?A physics theory called the Big Bang event explains how the cosmos grew from a highly dense and hot starting condition. The evolution of the observable universe from the earliest known times through its succeeding large-scale form is explained by several cosmological models of the Big Bang.
Everything in the cosmos was compressed into a singularity, a point of infinite heat and density, around 13.7 billion years ago. Our cosmos suddenly began to expand explosively, expanding faster than the speed of light.
Belgian Catholic priest, theoretical physicist, mathematician, astronomer, and professor of physics Georges Lemaître is credited with developing the theory itself. The notion was initially supported by Hubble's Law of the universe's expansion.
Thus, in the traditional Big Bang theory, the universe's creation involved a singularity.
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Which of the following is a chemical change?
A.)Butter melts
B.)Metal rusts.
C.)Water boils.
D.)Things dissolve.
Answer:
B.) Metal Rusts.
Thank You ☺️ ☺️.
☆ ★ Make It Brainlist Answer Please.....what ions represent an acid? What ions represent a base?
Explanation:
acid - An acid is a substance or compound that releases hydrogen ions (H+) when in solution. ...
A base is a substance that releases hydroxyl ions (OH-) when in solution. ...
Figure 2.4. ...
pH is a unit of measurement of the concentration of hydrogen ions (H+) and hydroxyl ions (OH-) in an aqueous (water) solution
base - H 3O + is called a hydronium ion, and it makes things acidic. OH - is called a hydroxyl ion and it makes things basic.
Which equation represents a fission reaction?
Superscript 14 subscript 7 upper N plus superscript 1 subscript 1 upper H right arrow superscript 15 subscript 8 upper O.
Superscript 235 subscript 92 upper U plus superscript 1 subscript 0 n right arrow superscript 140 subscript 55 upper C s plus superscript 94 subscript 37 upper R b plus 2 superscript 1 subscript 0 n.
Superscript 9 subscript 4 upper B e plus superscript 4 subscript 2 upper H e right arrow superscript 12 subscript 6 upper C plus superscript 1 subscript 0 n.
Superscript 239 subscript 93 upper N p right arrow superscript 239 subscript 94 upper P u plus superscript 0 subscript negative 1 e.
Answer:
B
Explanation:
on edge
The second equation represents a fission reaction because a large atom splits into many smaller atoms along with energy.
What is nuclear fission reaction?Fission reaction occurs when a larger atom split into two smaller atoms with the release of a tremendous amount of energy.
So we can conclude that the second equation represents a fission reaction because a large atom splits into many smaller atoms along with energy.
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If a dolphin is producing a vocalization with a frequency of 35 Hz, traveling at 1470 m/s, what is the wavelength of the sound?
Answer:
42
Explanation:
Divide the distance by the time.
If a dolphin is producing a vocalization with a frequency of 35 Hz, traveling at 1470 m/s, then wavelength of sound is 42m.
How do we calculate wavelength?Wavelength of sound will be calculated by using the below formula as:
λ = υ / f, where
υ = velocity or speed of sound = 1470 m/s
f = frequency of wavelength = 35 Hz
On putting values we get
λ = 1470 / 35 = 42m
Hence resultant wavelength of sound is 42m.
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Megan prepares a pitcher of lemonade by adding a quarter cup of granular sugar to the mixture. Which action should she take so the sugar dissolves in the lemonade faster?
A) Increase the amount of sugar.
B) Add a small amount of powdered sugar.
C) Stir the water continuously.
D) Cool the pitcher.
E) Reduce the original quantity of water.
ANSWER: C - Stir the water continuously ;)
Answer:
C. Stir the water continuously
Explanation:
stirring allows the solvent to continuously stick to the solvant
Question 1 (1 point)
HOW MANY moles of Neon would be contained in 4.0 L of neon gas at 560 kPa and 127 C?
Answer:
0.674 mol
Explanation:
Step 1:
Data obtained from the question.
Volume (V) = 4 L
Pressure (P) = 560 kPa
Temperature (T) = 127°C
Number of mole (n) =?
Step 2:
Conversion to appropriate unit.
For pressure:
101.325 KPa = 1 atm
Therefore, 560 kPa = 560/101.325 = 5.53 atm
For temperature:
Temperature (Kelvin) = temperature (celsius) + 273
temperature (celsius) = 127°C
Temperature (Kelvin) = 127°C + 273 = 400K
Step 3:
Determination of the number of mole of Neon.
The number of mole of Neon can be obtained by using the ideal gas equation as follow:
Volume (V) = 4 L
Pressure (P) = 5.53 atm
Temperature (T) = 400K
Gas constant (R) = 0.082atm.L/Kmol
Number of mole (n) =?
PV = nRT
5.53 x 4 = n x 0.082 x 400
Divide both side by 0.082 x 400
n = (5.53 x 4) /(0.082 x 400)
n = 0.674 mol
The number of mole of Neon is 0.674 mol
To find the number of moles of Neon in 4.0 L of neon gas at 560 kPa and 127 °C, the ideal gas law is used, and approximately 0.674 moles of Neon are found.
The student has asked how many moles of Neon would be contained in 4.0 L of neon gas at 560 kPa and 127 °C. To answer this question, we will use the ideal gas law, which can be stated as PV = nRT where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature in Kelvin.
First, convert the temperature from Celsius to Kelvin:
T(K) = 127 °C + 273.15 = 400.15 KConvert pressure from kPa to atm:
P(atm) = 560 kPa / 101.325 kPa/atm = 5.528 atmThe ideal gas constant, R, is 0.0821 L·atm/mol·K.
Now, rearrange the ideal gas equation to solve for n (moles):
n = PV / (RT)Plugging the values in, we get:
n = (5.528 atm × 4.0 L) / (0.0821 L·atm/mol·K × 400.15 K)n ≈ 0.672 moles of NeonTherefore, there are approximately 0.674 moles of Neon in 4.0 L of neon gas under the given conditions.
How much heat energy is added to 29.0 g of copper when the temperature changes by 25 degrees
Answer:
The correct answer is 3.0 * 10^3 J.
Explanation:
To solve this problem, we must use the formula q = mcΔT, where q represents the heat energy measured in joules, m represents the mass measured in grams, c represents the specific heat measured in J/°C*g, and ΔT represents the change in temperature, measured in °C.
To solve this problem, we must first plug the given values into the equation.
q = mcΔT
q = (29.0 g)(4.184 J/°C*g)(25 °C)
Now, we must multiply the values together to get our final answer.
q = 3033.4 J
But, we must remember the rules of significant figures, which tell us that since the temperature only had 2 significant figures, the answer must have 2 significant figures as well.
Therefore, the answer is:
q = 3.0 * 10^3 J
Hope this helps!
If only one molecule of sulfurous acid was involved in a chemical reaction, how many sulfur atoms would be in the products?
Answer:
1 atom sulfur
Explanation:
1 molecule sulforous acid = SO2 Thus, 1 atom sulfur and 2 atoms O
If the temperature of a gas changes, but the number of moles and volume remain constant, which of the following values must also change?
Density
Pressure
Number of atoms
Mass
If the temperature of a gas changes, but the number of moles and volume remain constant, Pressure also changed. Therefore, option B is correct.
What do you mean by pressure ?The amount of force exerted per area is defined as pressure. To generate a large amount of pressure, you can use either a large force or a force applied over a small area.
Pressure is a situation that can have serious consequences if you don't perform well; thus, performing under pressure. It appears to be a life-or-death situation: your reputation, a relationship, your success, or your safety are all at stake. Your inability to distinguish between stress and pressure can be detrimental.
Pressure changes when the temperature of a gas changes but the number of moles and volume remain constant.
Thus, option B is correct.
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Oceanic crust is
-
made mostly of granite
made mostly of limestone and salt
thinner than continental crust
thicker than continental crust
Answer:
It is thinner than the continental crust.
Explanation:
The oceanic crust is largely made up of basalt, a dense type of rock that forms from solidified lava, and it is thinner than the continental crust that is mainly composed of granite.
Explanation:The oceanic crust is primarily composed of a type of rock known as basalt. This is a dark, dense igneous rock that forms due to the cooling and solidifying of lava. In contrast to the granitic composition of the continental crust, the oceanic crust's basaltic composition is denser but thinner than the continental crust. Hence, the oceanic crust is not made mostly of granite, limestone or salt, but rather, it is predominantly basalt and it is not thicker but thinner than continental crust.
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How many grams of oxygen gas are there in a 2.3L tank at 7.5 atm and 24° C?
Answer:
22.656 grams of oxygen gas are there in a 2.3L tank at 7.5 atm and 24° C
Explanation:
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law:
P * V = n * R * T
where R is the molar constant of the gases and n the number of moles.
In this case you know:
P= 7.5 atmV= 2.3 Ln= ?R= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= 24 °C= 297 °K (being 0°C=273°K)Replacing:
[tex]7.5 atm* 2.3 L=n*0.082 \frac{atm*L}{mol*K} *297K[/tex]
Solving:
[tex]n=\frac{7.5 atm* 2.3 L}{0.082 \frac{atm*L}{mol*K} *297K}[/tex]
n=0.708 moles
Knowing that oxygen gas is a diatomic gas of molecular form O₂ and its mass is 32 g / mole, you can apply the following rule of three: if 1 mole contains 32 grams, 0.708 moles, how much mass will it have?
[tex]mass=\frac{0.708 moles*32 grams}{1mole}[/tex]
mass= 22.656 grams
22.656 grams of oxygen gas are there in a 2.3L tank at 7.5 atm and 24° C
Answer:
The mass of oxygen gas is 22.66 grams
Explanation:
Step 1: Data given
Volume of tank = 2.3 L
Pressure = 7.5 atm
Temperature = 24.0°C = 273 +24 = 297 K
Step 2: Calculate moles oxygen gas
p*V = n*R*T
⇒with p = the pressure of the oxygen gas = 7.5 atm
⇒with V = the volume of the tank : 2.3 L
⇒with n = the moles of oxygen gas = TO BE DETERMINED
⇒with R = the gas constant = 0.08206L*atm/mol*K
⇒with T = the temperature = 297 K
n = (p*V- / (R*T)
n = (7.5 atm * 2.3L) / (0.08206 L*atm/mol*L * 297K)
n = 0.708 moles
Step 3: Calculate mass of oxygen gas
Mass O2 = moles O2 = molar mass O2
Moles O2 = 0.708 moles * 32.0 g/mol
Moles O2 = 22.66 grams
The mass of oxygen gas is 22.66 grams
If the pressure changes from 1 atm to 3 atm, what does the volume of 30 L change to
Answer: 10L
Explanation:
Given that:
Initial pressure P1 = 1 atm
New pressure P2 = 3 atm
Initial volume V2 = 30 L
New volume V2 = ?
Since pressure and volume are involved, apply the formula for Boyle's law
P1V1 = P2V2
1 atm x 30L = 3 atm x V2
30 atm L = 3 atm x V2
V2 = (30 atm L / 3 atm)
V2 = 10L
Thus, volume changed to 10 liters
where do the words go? please help me ASAP!!!
Answer:
ye
Explanation:
help
Convert 2.70
atm
to
torr
Answer:
2052
Explanation:
multiply the pressure value by 760
To convert atm to torr, we should know 1 atm equals 760 torrs then the conversion exists 2052 torr.
What is meant by pressure conversion?
Torr and atm are the two main pressure units. To convert atm to torr, we should know 1 atm equals 760 torrs.
It exists the manometric pressure unit. It exists described as, the pressure exerted by column of mercury one millimeter high it exists represented by mmHg.
Torr to mmHg conversion:
Both exists equivalent to each other.
1 torr = 1 mmHg
Torr to atm:
Torr exists converted into atm by dividing the torr value 760.
mmHg to atm.
mmHg exists converted into atm by dividing the torr value 760.
Kilopascal:
The kilopascal exists the unit of pressure. It exists denoted by KPa.
Given:
2.70 atm
The conversion exists given by,
1 atm = 760 torr
2.70 atm = 760 × 2.70 torr
= 2052 torr
Therefore, the correct answer is 2052 torr.
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What is the chemical name for the compound If5
Answer:
Iodine pentafluoride
Explanation:
Answer:
Iodine pentafluoride
What is the molality of a solution containing 0.25 g
of dichlorobenzene (C6H4Cl2) dissolved in 10.0 g of
cyclohexane (C6H12)?
Answer : The molality of solution is, 0.170 mole/kg
Explanation : Given,
Mass of dichlorobenzene = 0.25 g
Mass of cyclohexane = 10.0 g
Molar mass of dichlorobenzene = 147.01 g/mole
Formula used :
[tex]\text{Molality}=\frac{\text{Mass of dichlorobenzene}\times 1000}{\text{Molar mass of dichlorobenzene}\times \text{Mass of cyclohexane (in g)}}[/tex]
[tex]\text{Molality}=\frac{0.25g\times 1000}{147.01g/mole\times 10.0g}=0.170mole/kg[/tex]
Therefore, the molality of solution is, 0.170 mole/kg