Explanation:
Sublimation describes a solid turning directly into a gas. Melting, on the other hand, occurs when a solid turns into a liquid. Water can, under the right circumstances, sublimate, though it usually melts at temperatures above 0 degrees Celsius or 32 degrees Fahrenheit. Carbon dioxide (CO2), however, is very different. The conditions that determine whether CO2 melts or sublimates are both temperature and atmospheric pressure.
Which of the following is the best way to make a conclusion?
A. The experiment must be manipulated until the results show what you want
B. Estimate results to where they should be
C. Choosing the results you like
D. Comparing data from the experiment to the prediction of the hypothesis
What happens to the water molecules when water at 24°C is cooled to 0°C
and freezes?
pls help its due tmr
giving brainliest
You read a primary source and a secondary source that discuss the same
experiment. There is a difference in the conclusions made by these two
sources. Which should you trust more, and why?
A. The primary source, because it is more confusing
B. The secondary source, because it is published in a well-respected
newspaper
C. The secondary source, because it is easier to read
D. The primary source, because it is written by the scientist who did
the work
Answer:
i think it's D tbh, just cus it was the scientist who did the work
Answer:
It depends on secondary sources and references of that secondary source. If it references just that primary source I would compare both of them and see the difference between them. Generally primary sources are more reliable but this situation is different.
Why is it important for some skateboarding ramps to be tall? Use the terms "potential energy" and "kinetic energy" in your answer. plsssssss help meeee Plzzz in kids words
Explanation:
Yw ❤
Shorter people have a lower center of gravity. Taller people have a higher center of gravity. A lot of skateboarding tricks depend on the center of gravity.
What is kinetic energy?
Kinetic energy is a form of energy it possess when any object or person is in motion . It can be defined as the work needed to be done to produce a motion in a object from rest position.
If we want to acceleration in an object then we must apply a force on a object to give motion so we can say that we required to do work for acceleration and then we can say that required is equal to kinetic energy.
Mathematically
Kinetic energy =1/2mv^2
Where
m = mass of object.
v = velocity of object
Kinetic energy is vector quantity it means that it have both i.e magnitude and vector.
S.I unit of Kinetic energy is Joule.
Therefore, Shorter people have a lower center of gravity. Taller people have a higher center of gravity. A lot of skateboarding tricks depend on the center of gravity.
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how would you measure out five moles of a gas?
How many moles of titanium are in a sample containing 2.8 x 10^24 atoms?
1) 1.69 x 10^48
2) 4.65 x 10^43
3) 4.65
4) 0.0465
5) 48
Answer:
4.65 moles
Explanation:
To calculate this, we can use Avogradro's Number: 6.022*10^23
[tex]2.8*10^2^4*\frac{1mole}{6.022*10^2^3} =4.65mol[/tex]
So, there are 4.65 moles in 2.8*10^24 atoms of Ti
How many levels are in the classification system?
A: 7
B: 2
C: 4
D: 6
Answer:
7
Explanation:
There are seven major levels of classification: Kingdom, Phylum, Class, Order, Family, Genus, and Species.
So, the answer is option A.
Please please help me
Answer:
I agree with Omar because it depends on what the charge of the object and magnet is. If the magnet is negative and the object is positive, they will pull together. If the magnet is negative and the object is negative then they will pull apart.
Explanation:
Gallium (Ga, 69.723 g/mol) is a metalloid obtained from its salts during the smelting of ores of other elements, like Zinc, Ga has broad applicability in the electronics industry. It is also used as a safe replacement for mercury in thermometers as it melts at 29.8 oC and has a heat of fusion of 5.59 kJ/mol. What is the entropy change of of gallium in as it melts when placed on a surface at 29.8 oC?
Answer:
4.255 J/ K
Explanation:
Given data :
mass of Gallium = 16 gm
molar mass = 69.723 g/mol
hence no of moles = 16 / 69.723 = 0.23 moles --------- ( 1 )
Δh ( heat fusion ) = 5.59 KJ/mol
Temperature = 29.8°C = 302.8 k
Determine the entropy change of gallium
Δs ( entropy change ) = heat fusion / temperature
= ( 5.59 * 1000) J/mol / 302.8 = 18.46 J/k*mol
Hence entropy change of gallium
= Δs * no of Gallium moles
= 18.46 * 0.23 = 4.255 J/ K
I need this like NOW
An area on the map where we might see strong winds is:
Question 5 options:
near Maine
near California
near Washington D.C.
near Kansas City
Help please
Lunar eclipses happen when the _____.
moon passes between the Earth and the sun
Earth passes between the sun and the moon
sun passes between the Earth and the moon
Answer:
mook passes between the earth and sun
PLZ HELP NO LINKS
What cell structure is necessary for photosynthesis?
xylem
chloroplasts
cell walls
roots
heat is the movement from areas of ___ temperature to areas of ___ temperature
Answer:
heat is the movement from areas of high temperature to areas of low temperature
Experimental Data
Enter the data shown in the video for Unknown Sulfate #23 below or where required, calculate the value from your data:
Mass of empty 250-mL beaker (from video) =129.536g
Mass of 250-mL beaker and unknown sulfate (from video) =129.840g
Mass of unknown sulfate (calculated) =0.304g
Mass of empty crucible (from video) =10.320g
Mass of crucible and barium sulfate (from video) =10.723g
Mass of barium sulfate =0.403g
Calculations and Conclusions
Calculate the mass of sulfate in the unknown sample:
Mass of sulfate in unknown =_______g
Calculate the percentage by mass of sulfate in the unknown sample:
Mass percent of sulfate in unknown =
%
The cation in the unknown sulfate is one of the following:
Al3+ Na+ Ni2+ K+ NH4+ Cd2+
For each of these six cations, write the formula of its sulfate, and calculate the percentage mass of sulfate in the compound.
Formula of aluminum sulfate =
Mass percent of sulfate in aluminum sulfate =
%
Formula of sodium sulfate =
Mass percent of sulfate in sodium sulfate =
%
Formula of nickel(II) sulfate =
Mass percent of sulfate in nickel(II) sulfate =
%
Formula of potassium sulfate =
Mass percent of sulfate in potassium sulfate =
%
Formula of ammonium sulfate =
Mass percent of sulfate in ammonium sulfate =
%
Formula of cadmium sulfate =
Mass percentage of sulfate in cadmium sulfate =
HELP!
The law of conservation of energy states:
A. Energy increases exponentially with times
B. Total energy decreases due to energy output.
C. Energy cannot be created or destroyed.
D. Energy always remains in the same form.
Answer:
C
Explanation:
energy cannot be created or destroyed like solar energy for instance. it is already energy because it comes from the sun and for other reason.
Hope this helps!
he image shows two air fronts moving in a region. The cold front is moving faster than the warm front.
Which will likely happen if the cold front continues to advance faster than the warm front?
Cold air will pass over the warm air, causing dry weather in the region.
Cold air will pass over the warm air, causing dry weather in the region.
Cold air will push up the warm air, resulting in heavy rainfall in the region.
Cold air will push up the warm air, resulting in heavy rainfall in the region.
Cold air will push up the warm a
Answer:
Cold air will push up the warm air, resulting in heavy rainfall in the region.
What is the concentration of kl solution if 20.68g of solute was added to enough water to form 100ml solution?
Answer:
1.25 M
Explanation:
Step 1: Given data
Mass of KI (solute): 20.68 g
Volume of the solution: 100 mL (0.100 L)
Step 2: Calculate the moles of solute
The molar mass of KI is 166.00 g/mol.
20.68 g × 1 mol/166.00 g = 0.1246 mol
Step 3: Calculate the molar concentration of KI
Molarity is equal to the moles of solute divided by the liters of solution.
M = 0.1246 mol/0.100 L= 1.25 M
A 59.7 g piece of metal that had been submerged in boiling water was quickly transferred into 60.0 mL of water initially at 22.0 °C. The final temperature is 28.5 °C. Use these data to determine the specific heat of the metal. Use this result to identify the metal.
Which part of the body transports molecules from food and air to the cells of the body
Answer:
Molecules from food and molecules of oxygen move from the mouth and the nose to cells of the body through a series of blood vessels, including veins, arteries, and microscopically small blood vessels (capillaries), that extend throughout the body.
Explanation: This is right
How many mL of isopropyl alcohol solution (40% v/v) would contain 2.5 mL of isopropyl alcohol? Report your answer in mL
Answer:
[tex]V_{solution}=6.25mL[/tex]
Explanation:
Hello there!
In this case, given the by-volume percent and the volume of isopropyl alcohol as the solute, we can compute the volume of the solution via:
[tex]\% v/v=\frac{V_{solute}}{V_{solution}} *100\%\\\\V_{solution}=\frac{V_{solute}}{\% v/v} *100\%[/tex]
Now, we plug in the given data to obtain:
[tex]V_{solution}=\frac{2.5mL}{40\%} *100\%\\\\V_{solution}=6.25mL[/tex]
Best regards!
how many moles are 20 grams of Helium ?
Answer: The correct answer is 5.00 moles
Explanation:
When the following equation is balanced, what is the coefficient of oxygen?
C2H5OH() + O2(g) --> CO2(g) + H2O()
Answer:
The answer is 3
C2H5OH + O2 CO2 +H2O (unbalanced)
C2H5OH +3O2(g). 2CO2(g)+3H2O(balanced)
According to the balanced chemical equation, C₂H₅OH + 3 O₂[tex]\rightarrow[/tex] 2 CO₂ + 3 H₂O the coefficient of oxygen is three.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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The diagram shows the sun's interior Convection are present in the convection zone Which describes how fluids change as they travel through the convection zone? Convection zone Radiation zone Core O They change to solids near the Sun's surface. They change to solids near the Sun's radiation zone O They become more dense near the Sun's surface. O They become more dense near the Sun's radiation zone
Answer:
C: They become more dense near the Sun's surface.
Explanation:
I got it correct on EDG
I hope this helps!!!!!!!!
Can I have a brainliest
According to convection, the statement which describes how fluids change as they travel through the convection zone is that they become more dense near the Sun's surface.
What is convection?Convection works by areas of a liquid or gas heating or cooling greater than their surroundings, causing differences in temperature. These temperature differences then cause the areas to move as the hotter, less dense areas rise, and the cooler, more dense areas sink.
Often the areas of heating and cooling are fixed, and allow convective cycles or currents to become established. For example, a saucepan of water over a flame may develop convective currents as the water is heated from below, rises to the surface, and cools. Once cooled enough, the water then sinks back to the bottom of the saucepan where the cycle is repeated, and the convective overturning continues.
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Help!!
Which of the following tends to have increased solubility from increased pressure?
A gas in a liquid.
a liquid in a solid.
a solid in a gas.
A solid in a liquid.
Answer:
a solid in a gas
Explaination:
because soild will take a long while to dissolve into liquid by heating the soild with gas it will disslove quicker
What is the total pressure of a mixture of gases, with 23 atm, 10 atm, 16 atm, and 30 atm?
Many power plants produce energy by burning carbon-based fuels, which also produces carbon dioxide. Carbon dioxide is a greenhouse gas, so over-production can have negative effects on the environment. Use enthalpy of formation data to calculate the number of moles of CO2(g) produced per megajoule of heat released from the combustion of each fuel under standard conditions (1 atm and 25 °C).
Answer:
2.54 molMJ-1
Explanation:
The formation of CO2 is according to the equation;
C(s) + O2(g) -------> CO2
ΔHreaction = ΔHCO2 - [ΔHO2 + ΔHC]
ΔHO2 and ΔHC = 0 KJ
ΔHCO2 = -393.5 KJ
Hence;
ΔHreaction = -393.5 KJ - 0 KJ
ΔHreaction = -393.5 KJ
1 mol of CO2 yields -393.5 KJ/mol
The negative sign only means that heat was evolved in the process.
nCO2 = 1 mol CO2/393.5 KJ * 1 * 10^3 KJ/1MJ
nCO2 = 2.54 molMJ-1
Which do all cells need in order to function?
oxygen
water
carbon dioxide
offspring
Answer:
oxygen is the correct answer
Explanation:
you need oxygen in order to breath, eat, drink, and many other stuf! hope i helped!
What do you think the biggest risk with genetic engineering is?
Answer:
Harmful toxins from crops have been found in peoples blood.
GM crops can cause allergic reactions in crops
Its dangerous to mess with nature this way when it should be a natural thing.
Explanation:
I'm in both Biology and Chemistry so I know a lot!
how many moles of ag can be produced if 250g of CU are reacted with excess agNo3, according to the equation Cu(s) + 2AgNO3(aq) -> 2Ag(s) + Cu(NO3)2(aq)?
Answer:
[tex]250 \times \frac{1}{63.5} \times \frac{2}{1} = 7.874mol \: ag[/tex]
Need help with chemistry!
Answer:
c
Explanation:
I am not sure but this is the answer I can provide now