Answer:
It was the fifth radioactive element discovered, and is typically a colorless gas that puts off an insane glow when frozen.
A science teacher places a sealed microwave bag of popcorn on a balance and measures its mass.
She microwaves the popcorn and finds the mass again before opening the bag. The masses are nearly the same.
Which scientific law does this BEST demonstrate?
Law of Conservation of Energy
Law of Thermodynamics
Law of Conservation of Volume
Law of Conservation of Matter
Answer:
D.) The Law of conservation of Matter
Explanation: The popcorn goes into the microwave and since matter cannot be created or destroyed the mass stays the same.
Answer:
aki you there how are you
Explanation:
Will give lots of points if answered correctly. Determine the kb for chloroform when 0.793 moles of solute in 0.758 kg changes the boiling point by 3.80 °C.
Answer: The value of [tex]K_{b}[/tex] for chloroform is [tex]3.62^{o}C/m[/tex] when 0.793 moles of solute in 0.758 kg changes the boiling point by 3.80 °C.
Explanation:
Given: Moles of solute = 0.793 mol
Mass of solvent = 0.758
[tex]\Delta T_{b} = 3.80^{o}C[/tex]
As molality is the number of moles of solute present in kg of solvent. Hence, molality of given solution is calculated as follows.
[tex]Molality = \frac{no. of moles}{mass of solvent (in kg)}\\= \frac{0.793 mol}{0.758 kg}\\= 1.05 m[/tex]
Now, the values of [tex]K_b[/tex] is calculated as follows.
[tex]\Delta T_{b} = i\times K_{b} \times m[/tex]
where,
i = Van't Hoff factor = 1 (for chloroform)
m = molality
[tex]K_{b}[/tex] = molal boiling point elevation constant
Substitute the values into above formula as follows.
[tex]\Delta T_{b} = i\times K_{b} \times m\\3.80^{o}C = 1 \times K_{b} \times 1.05 m\\K_{b} = 3.62^{o}C/m[/tex]
Thus, we can conclude that the value of [tex]K_{b}[/tex] for chloroform is [tex]3.62^{o}C/m[/tex] when 0.793 moles of solute in 0.758 kg changes the boiling point by 3.80 °C.
Para que sirven los modelos atómicos
Answer:
mi no speak espanol
Explanation:
The molar mass of copper (I) carbonate is
Answer:
[tex]\huge\colorbox{violet}{✏﹏ \: ᴀɴsᴡᴇʀ \: }[/tex]
➳The molar mass of copper (I) carbonate is 187.1 g/mol
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How many joules are required to change 40 grams of water to steam at the boiling point?
Answer:
2260 J
Explanation:
For water at its boiling point of 100 ºC, the heat of vaporization is 2260 J g-1. This means that to convert 1 g of water at 100 ºC to 1 g of steam at 100 ºC, 2260 J of heat must be absorbed by the water.
It takes a season to create a hybrid, and about 15 years to create a_____.
•It takes a season to create a hybrid, and about 15 years to create a Plant variety.
may this helps you
hope it's correct
bye
Why does the chloride ion have a charge of -1
Explanation:
As we know that chloride ion is halogen. So it has seven valence electrons in its valence shell. Hence it gains one electron from others during chemical reaction to be stable. So Chloride ion have a negative charge of -1.
Hope it will help :)❤
2.5 liters of gas is stored at a pressure of 100 atm, if the volume were increased to 4 liters, what would be the new pressure?
a. 250 atm
b. 1000 atm
c. 62.5 atm
d. 160 atm
Answer:
62. 5
Explanation:
Use P1V1=P2V2
100 × 2.5 =250 /4=62.5
Make up a short story to explain jays speed and acceleration change throughout his walk. Make sure to address parts A-D
Answer:
Speed of jays increases first, again increases, decreases and then increases.
Explanation:
The speed of jays increases while moving from rest to point A and no acceleration due to constant speed. From point A to point B, the speed is continues to increase and no acceleration. From point B to point C, the speed of jays decreases and acceleration is produced in the journey due to change of speed and from point C to point D, the speed of jays again increases and acceleration is produced due to increasing the speed.
Answer:
The speed of jay's walk increases first, again increases, then it decreases and then increases due to his acceleration walk during parts A-D.
Explanation:
how many molecules of CO2 would 700g be?
Answer:
13
Explanation:
Consider the combustion of pentane (C5H12)
a. Write the complete, balanced equation:
b. Determine the limiting reactant if 62.5 grams of pentane combine with 107 L of oxygen gas at STP.
c. If 54.6 L of CO2 gas is produced in the experiment, what is the percent yield?
Explanation:
C5H12 + 8O2 → 5CO2 +6H2O
balanced✓
stable✓
Which element has the highest electronegativity?
Answer:
fluorine
Explanation:
Answer:
The element with the highest electronegativity is fluorine with a score of 4.0 (which is the highest possible)
Explanation:
I personally haven't gotten this question yet so I hope this helps you!
hello guys,
differentiate between vapourisation and evaporation
Answer:
vapourisation can occur from solid or liquid into a gas but evaporation is straight from a liquid and is often below boiling temperature while vapourisation is often above boiling temperature
Answer:
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Differences between Vaporization & Evaporation:-[tex]{\huge\pink{\fbox{{࿐αɴѕωєя࿐}}}}[/tex]
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DefinitionTransition of stateSpeed of processEffect areaMovement of molecule[tex] \huge\purple{ \mid{ \underline{ \overline{ \tt VAPORIZATION: }} \mid}}[/tex]
It is defined as the transitional phase of a compound or an element at the boiling temperature.It changes the state of matter from a solid or liquid to a gas.It is generally happening at a fast pace and also it needs less amount of energy.During the vaporization process, all of the water turns into a gas.During vaporization, molecules may come from below the surface of liquid also.[tex] \huge\orange{ \mid{ \underline{ \overline{ \tt EVAPORATION:}} \mid}}[/tex]
It is nothing but a special kind of vaporization and mostly occurring at the temperature below the boiling point.It changes the liquid state of the matter directly into a gas.It is generally a slower process that needs more energy.During the evaporation process, only the top level of water turn into gas.During evaporation, molecules vaporize from the surface of liquid only.➳ ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
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Why is CaCl, called "calcium chloride" but SCl, is called sulfur
dichloride?
Answer:
because Sulphur is written as S₂
Explanation:
What volume of 1.50 M KBr is fromed ,using 15.6 mL of concentrated KBr with a molarity of 9.65 M?
Answer:
100.4mL
Explanation:
Using the following formula:
C1V1 = C2V2
Where;
C1 = initial concentration (M)
C2 = final concentration (M)
V1 = initial volume (mL)
V2 = final volume (mL)
According to the information in this question,
C1 = 1.50M
V1 = ?
C2 = 9.65 M
V2 = 15.6 mL
Using C1V1 = C2V2
V1 = C2V2/C1
V1 = (9.65 × 15.6) ÷ 1.5
V1 = 150.54 ÷ 1.5
V1 = 100.36 mL
Approximately, V1 = 100.4mL
what is the physical change of a liquid to a solid by the removal of heat?
A team of scientists claim that they have discovered a new experimental
method for determining percent composition. Which of the following is
necessary for the claim to be considered valid?
A. The method must support the law of conservation of mass.
B. The percent compositions for any two compounds made from the
same elements must be the same.
C. Each atom must contribute the same mass to the compound.
D. All scientists using the new method must get the same results.
Answer:
Option C
Explanation:
The new method must support the law of definite proportions which means that if one mole of compound is distributed percentage wise then the sum of % share of each element must be equal to one mole of compound and this percentage distribution always remains the same in all conditions
Hence, option C is correct
9. The verb corrode means 'wear away gradually, usually by a chemical reaction." A metal
that is prized for its "resistance to corrosion" has what property?
A metal that is prized for its resistance to corrosion has what property?
Answer:
The metal has a high resistance to corrosion, meaning it is more durable and will nor rust easily.
Explanation:
The verb "corrode" means the condition of being damaged easily. In other words, it means that the metal or item gets worn out easily and is not long-lasting.
So, when metal is prized for its resistance against corrosion, it means that the metal is strong and does not wear out easily. It can outstand and withheld the corrosion effect longer. This means that the metal is durable and will not corrode easily.
If 4.04g of h2 gas react with oxygen gas to create 36.36g of water, how many grams of oxygen reacted?
Answer:
gO₂ = 32.32 g
Explanation:
In this case, let's write the general equation:
2H₂ + O₂ -------> 2H₂O
In this case, we can use the 1° law, which is mass conservation. If the product has 36.36 g of water, then in the reactants we should have the same 36.36 g.
According to this, we already have 4.04 of hydrogen, then the remaining to reach the 36.36 g would be:
gO₂ = 36.36 - 4.04
gO₂ = 32.32 gHope this helps
Help please I’m confused
Answer:1 answer number 1
Explanation:
if there is a bottle of grape juice with 20% juice and there is 1000mL of total drink, how many mL of water
is in the bottle?
Answer:
760ml of water
Explanation:
Answer: 800mL
Explanation:
20% of 1000mL is 200. 1000mL - 200mL is 800mL
Annie has a soccer ball and a kickball. She kicks each ball with the same force. The soccer ball accelerates at 3 m/s2, and the kickball accelerates at 5 m/s2. Use Newton’s laws to describe why the kickball has a greater acceleration.
Also sorry its actually science
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Which two types of energy are formed by the transformation shown in the
photo?
O A. Chemical energy - thermal energy
B. Thermal energy - electrical energy
C. Thermal energy - chemical energy
D. Chemical energy - electromagnetic energy
Answer:
D
Explanation:
Hope it helps
#CarryOnLearning
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What type of circuit does this figure represent?
an open series circuit
an open parallel circuit
a closed parallel circuit
a closed series circuit
Electricity and magnetism
Answer:
a closed series circuit
Answer:
An open series circuit
Explanation:
I'm late but for future people...
I took the test.
Explain how the digestive/excretory system is similar to a recycling center
Answer:
The digestive system is a system where our body breaks down food to acquire important nutrients. This is the same as your local recycling center because they collect and breaks the plastic down to be reused into recycled products.
The excretory system is a system where we remove excess unnecessary materials. This can be the same as the recycling center because they remove unnecessary materials (such as trash that is not meant to be recycled).
Which of the following can be classified as a good conductor of thermal energy?
plastic
wood
rubber
copper
9.49.8 grams of Kl is dissolved in 1.00 kg of solvent. What is the molality?
Answer:
Molality = 9.498 mol k g − 1
Explanation:
A final way to express the concentration of a solution is by its molality. The molality ( m ) of a solution is the moles of solute divided by the kilograms of solvent. A solution that contains 1.0 mol of NaCl dissolved into 1.0 kg of water is a “one-molal” solution of sodium chloride.
molality = number of moles of solute/ mass of solvent in kg
number of moles of KI = mass of KI / molar mass of KI
number of moles of KI = 9.49.8 g / 1.00 g m o l − 1
number of moles of KI = 9.498 moles
molality = 9.498 moles / 1kg
molality = 9.498 mol k g − 1
If energy was added to solid, what state would it change to
A. Super solid
B. Plasma
C. Liquid
Answer:
Explanation:
The answer is C Liquid
Wat two common uses for Cadmium
Answer:
Common (industrial) uses for cadmium today are in batteries, alloys, coatings (electroplating), solar cells, plastic stabilizers, and pigments
A solution of KOH is prepared with a [OH-] concentration of 3.3 × 10-2 M. Calculate [H+], pH, and identify whether the solution is acidic, basic, or neutral.
Answer:
[H⁺] = 3.03x10⁻¹³ MpH = 12.52The solution is basicExplanation:
We can first calculate [H⁺] by using the formula:
[H⁺] * [OH⁻] = 1x10⁻¹⁴[H⁺] * 3.3x10⁻² = 1x10⁻¹⁴[H⁺] = 3.03x10⁻¹³ MNow we proceed to calculate pH:
pH = -log [H⁺]pH = -log (3.03x10⁻¹³)pH = 12.52As the pH is higher than 7, the solution is basic.