I need help please help
Answer:
I don't know the help you are talking about.
Mercury-203 undergoes beta minus decay. the subscript in the nuclide notation, hg, is . 203 ? hg →? the element symbol produced is . it has a mass number and an atomic number . 203 80 hg → 203 81 ti ?
When Mercury-203 undergoes beta minus decay, the nucleus that is formed is 203/81Tl.
What is beta emission?A parent nucleus is said to undergo beta emission when only when an electron is lost to form the daughter nucleus. This would make the atomic number of the daughter nucelus to increase by 1.
Hence, when Mercury-203 undergoes beta minus decay, the nucleus that is formed is 203/81Tl.
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Answer:
Mercury-203 undergoes beta minus decay. The subscript in the nuclide notation, Hg, is ____80______
The element symbol produced is __TI__ . It has a mass number __203__ and an atomic number ___81____
80
Explanation:
Which best explains the relationship between evaporation and temperature?
A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed as easily from the liquid’s surface.
A liquid evaporates faster at lower temperatures because the attractions are decreased and more particles can escape the surface of the liquid.
A liquid evaporates slower at higher temperatures because the vapor pressure of the liquid is higher, so fewer molecules can escape the surface.
A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Answer:
A liquid evaporated slow at higher temperature bz the vapour pressure of the is higher so few molecule can escape the surface
Answer:
The correct answer is D. A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Explanation:
I just got it right on Edge.
Hope this helped!
Brainliest would be greatly appreciated :D
Which group of compounds tastes bitter and are usually slippery when placed in water?.
Answer:
Bases
Explanation:
Soap is a common example of a base. They taste bitter (try tasting soap or shampoo) and are slippery (that is why a wet bar of soap flies out of your hands)
Shaila is collecting data to calculate the density of a piece of wood. First, she
places the wood on a triple beam balance; its mass is 63.85 g. Then, she fills a
graduated cylinder with 50.0 mL of water. She places the wood in
graduated cylinder with the water and notes that the water level rises to 125.0
mL. Calculate the density of the wood given that D = m/V. i need some1 to explain this
Answer:
Explanation:
Remark
You have 2 facts that you got from the experiment. The first is that the mass of the wood is 63.85 grams and the volume can be calculated.
From there, the desity can be found.
Givens
m = 63.85 grams
vo = 50 mL
vf = 125 mL
Solution
Volume = vf - vo
Volume = 125 mL - 50 ml. This gives you the amount of water that has been moved aside (called displaced)
volume = 75 mL
D = 63.85 grams/ 75 mL
D = 0.851 grams / mL
Some woods actually do have a density less than 1 which is the density of water. These woods float.
A 100-gram sample of material requires 1220 calories of heat energy to raise its temperature from 20 0C to 80 0C. What is the specific heat capacity of the material?
Taking into account the definition of calorimetry, sensible heat and latent heat, the specific heat capacity of the material is 0.203 [tex]\frac{calories}{gC}[/tex].
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
The amount of heat a body receives or transmits is determined by:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
Specific heat capacity of the materialIn this case, you know:
Q= 1220 caloriesc= ?m= 100 gΔT=Tfinal - Tinitial= 80 C - 20 C= 60 CReplacing in the definition of amount of heat:
1220 calories= c× 100 g× 60 C
Solving:
c= 1220 calories÷ (100 g× 60 C)
c= 0.203 [tex]\frac{calories}{gC}[/tex]
Finally, the specific heat capacity of the material is 0.203 [tex]\frac{calories}{gC}[/tex].
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What is the molar concentration of HBr if 25 mL of the acid is titrated 15.3 mL of 0.5 M KOH?
Round answer to 2 decimal places.
What kind of property is melting point? an atomic property , , , an atomic property , , a physical property , a physical property , , an acidic property , an acidic property , , a chemical property
Answer:
physical property has a melting point
Fill In the
476 nm = 4.76 x 10^? Cm
Recall that 1 nm 1 x 10 m and 1 cm = 1 x 10-2 m. You will want to memorize the metric conversion factors and those covered in this lesson!
Answer:
I gotthe answer
Explanation:
The explanation is This
Now writing the value in sentific term
It would look like
[tex]4.76 \times {10}^{2} \times {10}^{ - 9} [/tex]
[tex]4.76 \times {10}^{2 - 9} [/tex]
4.76
[tex]4.76 \times {10}^{ - 7} [/tex]
Now in centimeter
[tex]4.76 \times {10}^{ - 5} [/tex]
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE
_____2. To eliminate the spattering and aerosolization associated with flaming of loops, char the material before fully inserting the loop into the flame: i. E. , before flaming, hold the loop close to (but not into) the flame. Alternatively, use disposable loops or a micro-incinerator.
The description included refers to safety measurements when using microbiological transfer loops in the laboratory.
What are microbiological transfer loops?These are simple tools used to pick up small samples of microorganisms, which is often used to transfer the microorganisms.
How to use trasnfer loops?Transfer loops can easily contaminate; due to this, it is essential to flame loops. This should be done either by:
Using a micro-incinerator.Holding the loop very close to a flame without inserting it.Learn more about microorganisms in: https://brainly.com/question/6699104
disadvantages of hard water
Answer:
Here are some disadvantages
Explanation:
Hard water does not pose a health threat.
Hard water can contribute to dry skin and hair.
Hard water is unfit for washing as it is difficult to form lather with soap.
Trimming of kettles will take place due to the formation of magnesium and carbonates of calcium.
The Taste/Smell
Lather
Dishwashing Ability
Clothes-Washing Ability
Staining
Limescale Buildup
Corrosion
What is the name of bird W?
Answer:
woodpecker it's easy lil lol
How would the graph below change if a catalyst were added to the reaction?
2
Potential Energy
3
Reaction Progress
A. Part 1 would be higher, and part 2 would be lower.
B. Parts 1, 2, and 3 would be lower.
C. Part 2 would be lower, and parts 1 and 3 would be unchanged.
D. Parts 1 and 3 would be higher, and part 2 would be unchanged.
In an energy profile diagram, part 2 the initiation or activation energy is lowered and parts 1 and 3 would be unchanged; option C.
What is the effect of addition of a catalyst to reaction?A catalyst is a substance which alters the rate of a chemical reaction but is not chemically altered in the reaction.
Addition of a catalyst to a reaction lowers the activation energy of that reaction.
Thus, in an energy profile diagram, part 2 the initiation or activation energy is lowered and parts 1 and 3 would be unchanged.
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In an energy profile diagram, in part 2 the initiation or activation energy is lowered and parts 1 and 3 would be unchanged. Hence, option C is correct.
What is the effect of the addition of a catalyst to the reaction?The addition of a catalyst provides an alternate pathway/mechanism with a lower energy of activation, thus speeding up the reaction.
Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism.
Thus, in an energy profile diagram, in part 2 the initiation or activation energy is lowered and parts 1 and 3 would be unchanged.
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Aspirin is one of the Aesthetic Values of biodiversity
true
false
Answer:
true
Explanation:
Answer:
its true
Explanation:
you know Aspirin is one of the Aesthetic Values of biodiversity is true
hope it help to you and goodluck next time
3 grams of Aluminum was heated from 20 °C to 662 °C while absorbing
1728 I of heat. What is the specific heat of Aluminum?
The specific heat capacity of Aluminum of mass 3 grams that was heated from 20 °C to 662 °C while absorbing 1728 J of heat is 12.5 J/g°C.
What is specific heat capacity?The specific heat capacity of a substance can be calculated using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperatureAccording to this question, 3 grams of Aluminum was heated from 20 °C to 66.2 °C while absorbing 1728 J of heat.
1728 = 3 × c × (66.2 - 20)
1728 = 138.6c
c = 1728 ÷ 138.6
c = 12.5 J/g°C
Therefore, the specific heat capacity of Aluminum of mass 3 grams that was heated from 20 °C to 662 °C while absorbing 1728 J of heat is 12.5 J/g°C.
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PLEASE HELP: You have been given 0.507 moles of cesium fluoride (CsF), determine the mass in grams of cesium fluoride that you have.
Answer:
C because 77.0 CsF
Explanation:
That is the correct answer because I have that homework and i got it right
8) F2(g) + CaBr2(g) -> CaF2(g) + Brz(g)
What type of reaction is shown above?
A) synthesis
B) decomposition
C) single replacement
D) double replacement
What two layers in the atmosphere protect us?
Answer:
The Stratosphere and Troposphere
Answer:
trophosphere and stratosphere protect us from ozone rays
Explanation:
What is the mass of oxygen in 25. 0 grams of potassium permanganate kmno4.
Answer: The mass of oxygen in 25.0 grams of potassium permanganate, KMnO4 is 10.13 grams. molar mass of KMnO₄ = 39 + 55 + 16(4).
Explanation:hope this helps ^^ have a good day xlXCherryColaXlx..(pls mark me brainliest)
To determine the mass of oxygen in 25.0 grams of potassium permanganate (KMnO4), we need to consider the molar mass and the ratio of oxygen atoms in the compound.
What is molar mass ?Molar mass is a term used in chemistry to denote the mass of one mole of a substance. It is expressed in grams per mole (g/mol). Molar mass is calculated by summing up the atomic masses of all the atoms in a molecule, as indicated by its chemical formula.
The molar mass of potassium permanganate (KMnO4) can be calculated as follows:
Molar mass of K = 39.10 g/mol
Molar mass of Mn = 54.94 g/mol
Molar mass of O = 16.00 g/mol (since there are 4 oxygen atoms in KMnO4)
Molar mass of KMnO4 = (39.10 g/mol) + (54.94 g/mol) + (4 * 16.00 g/mol)
= 39.10 g/mol + 54.94 g/mol + 64.00 g/mol
= 158.04 g/mol
Now, we can calculate the mass of oxygen in 25.0 grams of KMnO4 using the molar mass and the molar ratio:
Mass of oxygen = (Molar mass of O / Molar mass of KMnO4) * Mass of KMnO4
= (4 * 16.00 g/mol / 158.04 g/mol) * 25.0 g
= (64.00 g / 158.04 g) * 25.0 g
= 0.4052 * 25.0 g
= 10.13 g (rounded to two decimal places)
Therefore, the mass of oxygen in 25.0 grams of potassium permanganate (KMnO4) is approximately 10.13 grams.
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A solution is prepared by dissolving 17. 1 g of sucrose (C12H220,1) in 275 g of H2O.
a. What is the molar mass of sucrose?
b. What is the molality of that solution?
Answer:
If you know the formula to use you should have no trouble getting the answers.
molality = mols/kg solvent.
mols sucrose = g/molar mass
kg solvent = 0.275 kg.
When determining the cell potential for a hypothetical galvanic cell containing two different materials, how do we determine which substances comprise the anode and which comprise the cathode
To determine the substance that comprises the anode and the cathode in a galvanic cell is by determing ;
The material with the larger (more positive) standard reduction potential that will be the cathode.
Characteristics of a galvanic cellIn a galvanic cell, oxidation which leads to the loss of elctrons occurs at the anode, while reduction ( addition of elctrons ) occurs at the cathode. therefore the materials with a more positive standard reduction potential will be the cathode of the galvanic cell.
Hence we can conclude that The material with the larger (more positive) standard reduction potential will be the cathode.
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Strong nuclear forces inside the atomic nucleus tend to ____ .
a. cause nuclear decay
b. hold the nucleus together
c. make the nucleus unstable
d. push the nucleus apart
Answer: a. cause nuclear decay
Explanation:
Write a question you could ask the scientists who made Graph A (above) to learn more about how their evidence relates to global temperatures?
(Your question should show that you understand how changes in the amount of energy from the sun reaching Earth might affect global temperatures. Hint: use some information from the graph to make up your question.)
Answer:
The hypthesis of the stated thesis, states that the changes in solar irradiance effect surface tempeture of the glove. Why does the suns tempture effects the globes tempture?
Explanation:
The hypthesis of the stated thesis, states that the changes in solar irradiance effect surface tempeture of the glove. Why does the suns tempture effects the globes tempture?
Find the concentration of 0.75 mol.dm-³ AgNO3
The mass concentration of the 0.75 mol.dm-³ AgNO3 solution is 127.5 g/dm³.
What is concentration?Concentration is the amount of a solute present ina a given volume of solution.
Concentration of solutions can either be expressed as:
molar concentration Mass concentration Percentage concentrationThe concentration of 0.75 mol.dm-³ AgNO3 is a molar concentration.
The concentration can be converted to mass. concentration as follows:
Mass concentration = molar concentration × molar massmolar mass of AgNO3 = 170 g/mol
Mass concentration = 0.75 × 170 = 127.5 g/dm³.
Therefore, the mass concentration of the AgNO3 solution is 127.5 g/dm³.
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explain volume and pressure at constant temperature of a gas using the kinetic molecular
Answer:
If the temperature is increased, the average speed and kinetic energy of the gas molecules increase. If the volume is held constant, the increased speed of the gas molecules results in more frequent and more forceful collisions with the walls of the container, therefore increasing the pressure
Explanation:
hope this helps
How many moles of chlorine gas at 120.0 °C and 33.3 ATM would occupy a vessel of 25.5 L?
Temperature (T) = 120°C
= (120+273) K
= 393 K
Pressure (P) = 33.3 atm
Volume (V) = 25.5 L
Gas Constant (R) = PV/T
= (1*22.4)/273
= 0.082 atm.L/K.mol
Law= PV = nRT
= (33.3*25.5)
= (n*0.082*393)
= 849.15
= 32.226n
= 26.349n
= 26.3 mol Cl₂
therefore, the number of moles are 26.3 mol Cl₂.
PV = nRT
P = 33.3 atm
V = 25.5 L
n = ? mol
R = 0.08206 L•atm/K•mol
T = 120.0 °C + 273.15 = 393.15 K
Solve for moles:
n = PV/RT
n = (33.3 atm × 25.5 L)/(0.08206 L•atm/K•mol × 393.15 K)
= 26.3 mol Cl₂
Determine the number of moles of water that could be produce
from 10.0 mols of hydrogen gas and 6.0 mols of oxygen gas.
If 10.0L of hydrogen gas, and 6.0L of oxygen gas were used in
problem 1, how many liters of water vapor would be produced?
PLEASE HELP <3
From the mole ratio of the gases, 10 moles of hydrogen will produce 10 moles of water, and if 10.0 L of hydrogen and 6.0 L of oxygen were used, 10.0 L of water will be produced.
What is the mole ratio of reactants in the formation of water?The mole ratio of the reactants in the formation of water can be shown from the equation below:
[tex]2H_2 + O_2 \rightarrow 2H_2O[/tex]
Mole ratio of hydrogen to oxygen is 2:1
10 moles of hydrogen will require 5 moles of oxygen, therefore hydrogen is the limiting reactant.
10 moles of hydrogen will produce 10 moles of water.
1 mole of a gas has a volume of 22.4 L.
If 10.0 L of hydrogen and 6.0 L of oxygen were used, 10.0 L of water will be produced.
Therefore, the volume ratio of gas equals mole ratio of gas.
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Which is a characteristic of atoms?
O They come in ten major types.
© They are the smallest units of matter
0
They can be found in nonliving things only.
O They cannot combine together.
Answer:
They are the smallest units of matter
Explanation:
Atom are the basic units of a chemical element; the smallest unit of an element that retains the properties of an element
When you calculate the Ksp of calcium fluoride, CaF2, and the concentration of the F- ion is 4.2 x 10-4M, what is the concentration of the Ca2 ion
Calculate its molar solubility in a saturated aqueous solution that is also 0.050 M in fluoride ion, F-. Ksp = (x)(2x + 0.05)2. 2x = 4.210 4
An electric motor in a bike has a voltage of 24 V and produces 240 W of power. How much current does it draw?]
Answer:
Electrical energy is the product of power multiplied by the length of time it was consumed. So if we know how much power, in Watts is being consumed and the time, in seconds for which it is used, we can find the total energy used in watt-seconds. In other words, Energy = power x time and Power = voltage x current.
The amount of current the electric motor having a power of 240 W Will draw from the 24 V supply is 10 A
What is power?This is defined as the rate in which energy is consumed. Electrical power is expressed mathematically as:
Power (P) = voltage (V) × current (I)
P = IV
How to determine the currentFrom the question given above, the following data were obtained:
Voltage (V) = 24 V
Power (P) = 240 W
Current (I) = ?
P = IV
240 = I × 24
Divide both sides by 24
I = 240 / 24
I = 10 A
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