Answer:
Beta decay
Explanation:
Radioactive decay changes one nucleus to another. The type of decay that a particular nucleus undergoes depends on the number of neutrons and protons present in such nucleus.
Radioactive decay tends to lead to the attainment of a stable neutron/proton ratio.
The decay mode for cesium-137 is beta decay. The beta decay of cesium-137 yields Barium-137.
Beta decay decreases the neutron - proton ratio.
A plastic rod that have just been rubbed with a fur and kept near a negatively charged ballon that is freely suspended. The charged balloon moves away from the plastic. What does this explain you ?
Explanation:
that both the plastic & balloon have the same charge
In a calorimeter that contains water and an unknown metal, 100 grams of water
absorbs 4562.3 J of heat energy. How much heat energy does 15 grams of the metal
transfer to the water
a 4562.4 j
b 68434.5 j
c not enough info given
d 5244.5
An aqueous solution contains 0.30 M potassium cyanide. One liter of this solution could be converted into a buffer by the addition of:
Answer:
Hydrocyanic acid, HCN.
Explanation:
A buffer is defined as the aqueous mixture of a weak acid and its conjugate base. Or a weak base and its conjugate acid. In the problem, we have a solution of potassium cyanide. The conjugate acid of potassium cyanide is hydrocyanic acid. A weak acid with pKa = 9.89.
That means, to convert the solution into a buffer we must add:
Hydrocyanic acid, HCN.if you were conducting an experiment with pepsin which has an optimal enzymatic actigity at ph 2.3, wat buffer would be the best choice
Answer: One with a pKa of 1.9
Hope this helps <3
P.S Fun Fact~~
There are only two words in the English language that have all five vowels in order: "abstemious" and "facetious."!
Answer:
Explanation: Is there choises? H3PO4 / NaH2PO4 buffer with equal concentrations would form a buffer solution pH = 2.15
Describe how to test your unknown salt mixture for the presence of
Na3PO4.12H2O.
Na3PO4*12H2O + BaCl2*2H2O = Ba3(PO4)2 + NaCl + H2O
add barium chloride to your Na3PO4.12H2O a white precipitate of Ba3(PO4)2 will be formed wrt salt(NaCl) and water(H20) if Na3PO4.12H2O. will be there.
A metal has a mass of 35.4 g and volume 3.11 ml. Find the density of this metal
Answer:
11.4
Explanation:
Density = Mass / Volume
Density = 35.4 / 3.11
Density = 11.38263666
As there are more number of digits after the decimal, you can round it to 3 significant figure.
Now, your value will be:
Density = 11.4
Which of the following is the correct set up AND answer to convert 6.25 x
1032 atoms of Copper to grams of Copper?
Answer:
Explanation:
How many mols do you have?
1 mol = 6.02 * 10^23 atoms
x mol = 6.25 * 10 ^32 atoms
1/x = 6.02*10^23 / 6.25 * 10^32 Cross multiply
6.02 * 10^23 * x = 1 * 6.25 * 10^32 Divide by 6.02 * 10^23
x = 6.25 * 10*32/ 6.02 ^10^23
x = 1.038 * 10^9 mols which is quite large.
Find the number of grams. (Use the value for copper on your periodic table. I will just use an approximate number.)\
1 mol of copper = 63 grams.
1.038 * 10^9 mols of copper = x
1/1.038 * 10^9 = 63/x Cross multiply
x = 1.038 * 10^9 * 63
x = 6.54 * 10^10 grams of copper.
1) If a chemist has a 5.50 M solution of HCl, how many mL of acid will they need to add to how many mL of water in order to create 20.0 mL of 1.5 M HCl
Answer:
5.4 mL of acid need to be added to 14.6 mL of water.
Explanation:
We can calculate how many mL of acid are needed by using the C₁V₁=C₂V₂ formula:
5.50 M * V₁ = 1.5 M * 20.0 mLV₁ = 5.4 mLThen we calculate how many mL of water have to be added in order to reach 20.0 mL:
20.0 mL - 5.4 mL = 14.6 mLThus, 5.4 mL of acid need to be added to 14.6 mL of water.
What is the pH of a solution with a hydrogen ion concentration of 1.3X10^-11?
-11.1
-0.11
-10.9
-1.3
Answer:
11,1
Explanation:
-log(1.3x10^-11)
The pH of a solution with a hydrogen ion concentration of 1.3X10^-11 is -11.1. Therefore, option A is correct.
What do you mean by the pH ?The potential of hydrogen ion concentration is referred to as pH. a way to gauge how basic or acidic a material is. The pH scale represents from 0 to 14.
A pH value of 7 is considered neutral on this scale, which implies it is neither acidic nor basic. It is more than acidic if the pH value is below seven, and more basic if the pH value is above seven.
The pH can control the presence of nutrients, biological processes, microbial activity, and chemical behaviour.
Given:
Hydrogen ion concentration = 1.3X10^-11
pH = -log [H+]
pH = -log(1.3x10^-11)
pH = -11.1
Thus,-11.1 is the pH of a solution with a hydrogen ion concentration of 1.3X10^-11, option A is correct.
To learn more about the pH, follow the link;
https://brainly.com/question/15289741
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What is the specific heat of a metal if 17.5 g metal has a temperature increase of 26.8 °C when 570.4J of energy are added to it?
Answer:
1.22 J/g.°C
Explanation:
Step 1: Given data
Mass of the metal (m): 17.5 gTemperature increase (ΔT): 26.8 °CAdded energy (Q): 570.4 JStep 2: Calculate the specific heat of the metal (c)
A metal absorbs heat and, as a consequence, its temperature increases. We can calculate its specific heat using the following expression.
c = Q / m × ΔT
c = 570.4 J / 17.5 g × 26.8 °C = 1.22 J/g.°C
What kind of phase transition will occur when energy is continuously supplied to a solid sample?
A. Freezing
B. Ionization
C. Melting
D. Evaporation
Answer:
melting
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Electronegativity _____ from top to bottom on the periodic table.
No links please :)
PbO2 + 4HCl --- PbCl2 + Cl2 + 2H2O who buys electrons and who loses electrons?
Answer: Electrons are taken up by [tex]PbO_2[/tex] and they are lost by [tex]HCl[/tex]
Explanation:
Redox reaction is defined as the reaction in which oxidation and reduction take place simultaneously. It is also called the reaction where the exchange of electrons takes place.
An oxidation reaction is defined as the reaction in which a chemical species loses electrons takes place. In this reaction, the oxidation state of a substance gets increased.
A reduction reaction is defined as the reaction in which a chemical species gains electrons takes place. In this reaction, the oxidation state of a substance gets reduced.
For the given chemical reaction:
[tex]PbO_2+4HCl\rightarrow PbCl_2+Cl_2+2H_2O[/tex]
The half-reactions for this redox rection follows:
Oxidation half-reaction: [tex]2HCl\rightarrow ClO_2 + 2e^-[/tex]
Reduction half-reaction: [tex]PbO_2+2e^-\rightarrow PbCl_2[/tex]
Hence, electrons are taken up by [tex]PbO_2[/tex] and they are lost by [tex]HCl[/tex]
1. What is the relationship between pressure and volume?
Answer:
An increase in pressure would cause less volume and vice versa. They are inversely proportional.
Explanation:
This is due to Boyle's Law (and because an increase in pressure would increase the force on the container, however, if it's a closed container, it would burst)
Feel free to mark it as brainliest :D
From the following data ,determine of formation for diborane(B2H2(g), at 25
B2H2(g) 3O2(g)(B2O3(S)3H2O(g) ,=-1941kJ
2B(s) O2(g) (B2O3(s) ,=-2368 kJ
H2(g) O2(g) (H2O(g) , =-241.8 kJ
When water and alcohol are mixed, the final volume is less than the total of volume of alcohol plus water added due to .......
Answer:
molecules take up more space
Give an example where handpicking is used for separation. (1)
Answer:
If you want to separate black grapes from the mixture of black and green grapes, then you will simply pick black grapes using your hands from the mixture. In this way you are actually using handpicking separation method.
Explanation:
Calculate the pH of a solution whose H3O+ concentration is 2.1 x 10-3 M. Is the solution acidc, basic, or neutral?
a
The pH of the solution is 2.7 and the solution is acidic.
b
The pH of the solution is 13.3 and the solution is acidic.
c
The pH of the solution is 13.3 and the solution is basic.
d
The pH of the solution is 2.7 and the solution is basic.
Answer:
Option A, The pH of the solution is 2.7 and the solution is acidic
Explanation:
As we know,
pH = - log [H3O+]
Substituting the given values, we get
pH = - log [2.1 x 10-3 M]
pH = - (-2.678)
pH = 2.678 or 2.7
The solution is acidic as pH value is less than 7
Hence, option A is correct
200 grams of iron (III) chloride reacts with ammonium carbonate [(NH4)2CO3] in the following equation.
FeCl3 + (NH4)2CO3 ---------> NH4Cl + Fe2(CO3)3
_ mole(s) of iron (III) carbonate [Fe2CO3)3] is/are produced in the balanced equation.
a
4
b
1
c
3
d
2
Answer:
0.616 moles of Fe₂(CO₃)₃ are produced when 200 g of FeCl₃ react
b. 1.
Explanation:
The balanced reaction is:
2FeCl₃ + 3(NH₄)₂CO₃ → 6NH₄Cl + Fe₂(CO₃)₃First we convert 200 grams of FeCl₃ into moles, using its molar mass:
200 g ÷ 162.2 g/mol = 1.23 mol FeCl₃Then we convert 1.23 moles of FeCl₃ into moles of Fe₂(CO₃)₃, using the stoichiometric coefficients of the balanced reaction:
1.23 mol FeCl₃ * [tex]\frac{1molFe_2(CO_3)_3}{2molFeCl_3}[/tex] = 0.616 mol Fe₂(CO₃)₃The closest answer would be option b. 1.
Explanation:
[tex]FeCl₃ + (NH₄)₂CO₃ → NH₄Cl + Fe₂(CO₃)₃[/tex]
first balance the chemical equation
[tex]2FeCl₃ + 3(NH₄)₂CO₃ → 6NH₄Cl + Fe₂(CO₃)₃[/tex]
2 mole. 3 mole. 6mole. 1mole
2*162g of FeCl₃ produce 236 g of Fe₂(CO₃)₃
200g of of FeCl₃
produce 236/(2*162)*20=145.68 g of Fe₂(CO₃)₃
1 mole of Fe₂(CO₃)₃=236g
145.68g of Fe₂(CO₃)=1/236*145.68=}0.61mole
closest answer is b 1
b.1mole(s) of iron (III) carbonate [Fe2CO3)3] is/are produced in the balanced equation
which is best illustrated by Watson and Crick's ball and stick model of dna
Answer:
Here is your Answer.......
Explanation:
The Watson and Crick's ball-and-stick model of DNA best illustrates the role of creativity in scientific discovery
Which or the following will most likely happen if the pancreas does not produce sufficient insulin?
Answer:
C. Blood sugar increases b/c insulin lowers blood sugar when it rises too high
Explanation:
Insulin is highly needed by body to regular sugar levels (primarily to lower it when sugar levels rise up). I remember it like this "in" sulin means this hormones "pushes" the sugar inside the cells so that sugar level in the blood comes back to normal.
Therefore, if there is not enough insulin produced by pancreas, blood sugars will rise which can be fatal. That's why some diabetic patients take insulin shots to regulate their blood glucose levels.
Consider four different samples: aqueous LiBr, molten LiBr, aqueous LiF, and molten LiF. Current run through each sample produces one of the following products at the anode: liquid bromine, fluorine gas, or oxygen gas. Match each sample to its anodic product from aqueous LiBr, Molten LiBr, aqueous LiF, and molten LiFA. Liquid bromine,
B. Fluorine gas,
C. oxygen gas
Answer:
Following are the solution to the given question:
Explanation:
Please find the matching in attached file.
During the electrolysis of Molten LiBr : Li is reduced and Br are oxidized .
Lithium Metal is produced at the Cathod during the electrolysis of Molten LiBR .
In the aquous LiBr : In aquous LiBr potential of Li is greater than the of water then Li is reduced to produce solid Li ion. As well As aqueous LiF ( electrolysis)and Molten LiF electrolysis produce the gas.
aqueous LiF: Oxygen gas.
Molten LiF : Flourine gas.
Which of these is NOT a producer in the coral reef ecosystem? *
1. phytoplankton
2. sea grass
3. microalgae
4. coral
Answer:
option number 4. 'coral'
Explanation:
-
define photo electric effect
Photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.
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PPLEASSEEE HELLPPP!!
Answer:
1.8 × 10² J
Explanation:
Step 1: Given data
Mass of the rock (m): 20 gInitial temperature: 10 °CFinal temperature: 29 °CSpecific heat capacity of granite (c): 0.48 J/g.°CStep 2: Calculate the amount of heat absorbed (q)
We will use the following expression.
q = m × c × ΔT
q = 20 g × 0.48 J/g.°C × (29 °C - 10 °C) = 1.8 × 10² J
BRAINIEST AND POINTS
Which option below accurately describes the relationship between frequency and energy level?
A. Higher frequency means higher energy level.
B. Lower frequency means higher energy level.
Hdhduhdhdudbbdhhdhdhdhdjjdhdhduuxhxuxuxuxuux
Answer:
dfdgfhgjghfdgsfdaafsgdhfjgkfjdgsasfdgfhghjgfdsafg
im 100% sure
Explanation:
How many liters of wine can be held in a wine barrel whose capacity is 22.0 gal?
Question 2 options:
0.172 L
5.81 L
5810 L
83.3 L
0.000172 L
Answer:
83.3 L
Explanation:
Step 1: Given data
Capacity of the wine barrel (V): 22.0 gal
Step 2: Calculate how many liters of wine can be held in the barrel
To calculate the number of liters of wine that can be held in the barrel, we need to convert 22.0 gal to liters. We will use the conversion factor 1 gal = 3.79 L.
22.0 gal × 3.79 L/1 gal = 83.3 L
I have added 15 L of air to a balloon at sea level (1.0 atm). If I take the balloon with me
to Denver, where the air pressure is 0.85 atm, what will the new volume of the balloon
be?
Answer:17.65 or 18 L
Explanation:
13. Which of the following correctly provides the names and formulas of polyatomic ions?
chromate: Cro42 -; dichromate: Cr2O7 2 -
O nitrite: NO -; nitrate: NO2
sulfite: S 2-; sulfate: SO3
O carbonate: HCO3 -; bicarbonate: C03