Answer:
D
Explanation:
From periodic table : proton number 19 corresponds to K (potassium)
which is very reactive with water
current is created by the movement of what subatomic particle?
Answer:
I believe the answer is electrons.
Explanation:
Protons can't move and neurons don't have a charge so it would be electrons.
What dynasty came after China's Five Dynasties and Ten Kingdoms?
Answer:
The Five Dynasties and Ten Kingdoms (907-960) is a period of great division in Chinese history, and is also the collective name for the Five Dynasties and the Ten Kingdoms.
The Five Dynasties refer to the five regimes located in the Central Plains that were successively replaced after the fall of the Tang Dynasty, namely Later Liang, Later Tang, Later Jin, Later Han and Later Zhou. At the end of the Tang Dynasty, the Five Dynasties and the beginning of the Northern Song Dynasty, there were many separatist regimes outside the Central Plains, among which more than ten separatist regimes such as the former Shu, the latter Shu, and the Northern Han were collectively referred to as the Ten Kingdoms.
Explanation:
Answer:
Mongol Yuan dynasty.
Explanation:
Why is electron configuration important
because it's provide insight into the chemical behaviour of elements by helping determine the valence electrons of an atom
that's my answer
differentiate between positive and negative deviation ~
[tex] \\ [/tex]
ty! :)
Answer:
positive deviation from raoults law means when the vapour pressure is higher than the solution is expected to exhibit e.g of one is the mixture of acetone and ethanol
negative deviation means that it is opposed to the total vapour pressure of the solution
Which of the following is a nonrenewable resource: A- Hydropower, B- Biomass, C- Solar, and D- Petroleum
Answer:
D-Petroleum
Explanation:
because it takes millions of years to form petrol and it cannot be renewed again
What is the molarity of Na, SO, if you have 5 mol in 2.5 L?
47. Which of the following statements about the
bonds in the reactants and products is most
accurate?
(A) The sum of the bond enthalpies of the bonds
in the reactant is greater than the sum of the
bond enthalpies of the bonds in the
products.
(B) The sum of the bond enthalpies of the bonds
in the reactant is less than the sum of the
bond enthalpies of the bonds in the
products.
(C) The length of the bond between carbon
and oxygen in CH3OH is shorter than the
length of the bond between carbon and
oxygen in CO.
(D) All of the bonds in the reactant and products
are polar.
Answer:
a
Explanation: because the sum of the bond enthalpies of the bond in the reactant is greater than the sum.
Clarence grew three bearded iris plants. He put one in direct sunlight, one in
the shade, and one in the dark. The plant in the sun grew the most quickly and
looked the healthiest. Clarence concluded that bearded iris plants grow best
in the sun.
How would you evaluate Clarence's conclusion?
A. His conclusion is valid because his experiment included a control.
B. His conclusion is flawed because it is based on the appearance of the plants
C. His conclusion is flawed because he did not perform enough trails
D. His conclusion is bailed because he tested only one variable
contribution of chemistry in medicines
Answer:
Chemistry in Medicine
Explanation:
Major contributions to health care have been made by chemistry. The development of new drugs involves chemical analysis and synthesis of new compounds. Many recent television programs advertise the large number of new
drugs produced by chemists.
BRAINLIEST MEEEE PLSS
A tank (not rigid) contains 2.3L of
helium gas at 25°C. What will be the
volume of the tank after heating it
and its content to 40°C temperature
at constant pressure?
Given:
Unknown:
Formula:
Solution:
Final Answer:
Convert
Temp to Kelvin25°C=298K40°C=313KApply Charles law
V1T2=V2T12.3(313)=298V2719.9=298V2V2=2.4LAnswer:
See below ~
Explanation:
Q1
Given :
V₁ = 2.3LT₁ = 25°C = 298 KT₂ = 40°C = 313 KUnknown :
V₂Formula :
V₁/T₁ = V₂/T₂ (Charles Law)Solution :
2.3/298 = V₂/313V₂ = 313/298 x 2.3V₂ = 1.05 x 2.3V₂ = 2.42 LFinal Answer :
2.42 LQ2
Given :
P₁ = 1.01 atmV₁ = 6 LV₂ = 3 LUnknown :
V₂Formula :
P₁V₁ = P₂V₂Solution :
1.01 x 6 = P₂ x 3P₂ = 1.01 x 2P₂ = 2.02 atmFinal Answer :
2.02 atmWhich one of the following statements is NOT
applicable to molecular solids?
1. Molecular solids are usually excellent conductors of electric current.
2. Molecular solids have relatively low melting points.
3. Molecular solids are soft compared to covalent solids.
Answer:
1. Molecular solids are usually excellent conductors of electric current.
Explanation:
Molecular solids are actually insulators (prevent electricity).
What is an average? What is the formula to calculate an average? science
Answer:
A average is a number expressing the central or typical value in a set of data. add up all the numbers, then divide by how many numbers there are.
Explanation:
Please help me answer this question...
[tex] \begin{gathered} \begin{array}{ |c|c| } \pmb{ \sf{Electrolyte}}& \textsf{ \textbf{Formula of Ions}}\\ \\ \\ \sf sodium \: sulphate& \bf \red{Na_2SO_4} \\ \\ \sf magnesium \: chloride& \red{ \bf MgCl_2} \\ \\ \sf zinc \: sulphate & \bf \red{ZnSO_4} \\ \\ \sf potassium \: iodine& \red{ \bf KI} \\ \\ \sf sodium \: hydroxide& \bf \red{NaOH} \\ \\ \sf Copper(II) \: chloride & \red{ \bf CuCl_2} \\ \\ \sf silver \: nitrate& \red{ \bf{AgNO_3}}\end{array}\end{gathered}[/tex]
[tex]\\\\\\[/tex]
Sodium sulphatevalency:
Sodium - [tex]\sf Na^+[/tex]
sulphate - [tex]\sf {SO_4}^{-2}[/tex]
Magnesium Chloridevalency:
Magnesium- [tex]\sf Mg^{+2}[/tex]
Chloride- [tex]\sf Cl^{-1}[/tex]
zinc sulphatevalency:
zinc- [tex]\sf Zn^{+2}[/tex]
sulphate [tex]\sf SO_4^{-2}[/tex]
potassium iodinevalency:
potassium - [tex]\sf K^{+1}[/tex]
sulphate - [tex]\sf I^{-1}[/tex]
sodium hydroxidevalency:
sodium - [tex]\sf Na^{+1}[/tex]
hydroxide - [tex]\sf OH^{-1}[/tex]
Copper(II) chloridevalency:
Copper(II) - [tex]\sf Cu^{+2}[/tex]
chloride - [tex]\sf Cl^{-1}[/tex]
Silver nitratevalency:
Silver - [tex]\sf Ag^{+1}[/tex]
nitrate - [tex]\sf NO_3^{-1}[/tex]
[tex]\\\\\\[/tex]
Key Points :
Remember metals always have positive valency because lose their electrons from their valence shell to obtain Nobel gas configuration. And bases always have negative valency because they gain electronics to complete their shell and hence to obtain Nobel gas configuration.Metals are always written before basesWhile writing formula if both Ions have same valency then we don't write them in formula.⭑━━━━━━━✵━━━━━━━⭑
❥ωเɳ∂ყ✞ɱเɳƭ࿐In a spacecraft tge carbon dioxide exhaled by the astronaut can be removed by the reaction with lithium hydroxide, LiOH according to the following; CO2(g) + LiOH(g) = LiOH(s) + H2O(l) how many moles of Lithium hydroxide are required to react with 30 moles of CO2, average exhaled by each person
Answer:
30 moles
Explanation:
From the equation it is a one - to - one reaction
What type of reaction is the following?
H₂O ---> H₂ + O
[tex] \boxed{ \frak{Answer }}[/tex]
It's decomposition reaction.
[tex] \sf{Explanation}[/tex]
In decomposition reaction, a compound breaks into simpler form on heating.As, we can see in the above reaction, [tex] H_{2} O[/tex] is broken down into [tex] H_{2} [/tex] and [tex] O_{2} [/tex].
Hence it is a decomposition reaction.[tex] \boxed{ \frak{Be \: Brainly}}[/tex]
[tex] \boxed{ \frak{Keep \: Learning}}[/tex]
How many grams of Copper are in 500grams of Cu2CO3?
Answer:
Explanation:
Calculate the molar mass of Cu2CO3 in grams per mole or search for a chemical formula or substance. Molecular weight of Cu2CO3. ... Copper: Cu: 63.546: 2: 67.927%: Carbon: C: 12.0107: 1: ... it tells us how many grams …
What is the percent composition of Cesium and Fluorine in CsF?
Calculate the [H+], given the pH is 2.5
a
0.31 M
b
0.25 M
c
0.50 M
d
0.003 M
Answer:
D. 0.003
Explanation:
To find [H+] given pH, you do 10^-[pH]
10^-2.5 = 0.003
help me with this one please.
calculate the solubility of AgCl in:
100ml of 4×10^-3M calcium nitrate
(Ksp is = 1.6 ×10^-10)
10. Halothane is a popular inhalation anesthetic. It contains 12.15% carbon, 28.86%
fluorine. .506% hydrogen, 40.5% bromine, and 17.97% chlorine. What is the
empirical formula for this ssubstance?
Answer:
Halothane is a popular inhalation anesthetic. It contains 12.15% carbon, 28.86% fluorine, .506% hydrogen, 40.5% bromine, and 17.97% chlorine.
Explanation:
Are cable wires made of thermoplastic? If so why?
(This is just a doubt that just came into my head)
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Cable wires are usually made of of thermoplastics because, current passing through the wire has heating effects as well, due to collision of electrons in the conducting wire. so to avoid the melting of normal wire which can break the circuit, Thermoplastics are used, that doesn't have much effect of heat on them.
How old is a piece of cotton cloth if the half-life of carbon-14 is 5,730 years, and the carbon-14 composition of the cloth is 22 percent that of living plants?
Question 1 options:
A)
1,813 years
B)
1.21 × 10-4 years
C)
12,517 years
D)
1.21 × 10-4 years-1
The half-life is the time used by the concentration to get half of its initial value. The cotton cloth is 5097 years old.
What is radioactive decay?Radioactive decay is the reduction of the initial concentration to the half value. The exponential decay can be given as:
[tex]\rm N(t) = N_{0}e ^{-\lamda t}[/tex]
The decay constant is calculated as:
[tex]\begin{aligned} \lamda &= \rm \dfrac {ln (2)}{t\frac{1}{2}}\\\\&= \dfrac{\rm ln(2)} {5730}\\\\&= 0.0001209\end{aligned}[/tex]
Solving further:
[tex]\begin{aligned}0.22 &= \rm e^{-0.0001209 \times t}\\\\\rm ln 0.22 &= -0.0001209 \times t\\\\\rm t &= \rm \dfrac{log 0.22}{-0.0001209}\\\\&= 5097 \;\rm years\end{aligned}[/tex]
Therefore, the cotton cloth is 5097 years.
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Select the correct answer.
Which is an intermediate in this reaction mechanism:
step 1: H202 + 1 - H20 + O
step 2: H202 + or - H20 + O2+1"
A. H202
B.I-
C.OI-
D.O2
Answer:
I^-
Explanation:
Usually in these reactions we use palladium (pd) or platinum (pt) or halogens
Intermediate is the elements which runs the reaction.
Here iodine is doing that.
so option B is correct
Which of the following quantities represents the greatest volume?
A) 300 microliters
B) 3.0x106 nanoliters
C) 3.0x104 deciliters
D) 3.0x10-12 kiloliters
E) 3.0 milliliters
The lowest and largest conversion factors are nanoliters and kiloliters, respectively. Among all the given options, the correct option is option C.
What is volume?A liquid, solid, or gas's volume is the amount of three-dimensional space it occupies. Although there are many different units that may be used to indicate volume, the most common ones are liters, m³, gallons, milliliters, teaspoons, as well as ounces.
Gases have a volume equal to the internal capacity of the container since they fill their containers to the brim. Containers with a designated volume or one whose interior form is known are frequently used to measure liquids. Measuring cups, graded cylinders, flasks, as well as beakers are a few examples of the tools used to quantify liquid volume. 3.0x10⁻¹²kiloliters represents the greatest volume.
Therefore, the correct option is option C.
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How many milliliters of a 12% (v/v) propyl alcohol solution would you need to obtain 7.5 mL of propyl alcohol? Answer to the tenth
[tex]\tt \dfrac{7.5}{12}\times 100=62.5~ml[/tex]
You have an unknown compound of Potassium derivatives (KIxOy). This sample contains 17.0g of potassium, and 27.8g of oxygen and 55.2g of iodine. If you prepared another sample, but this time it had 460.0g of potassium periodate, how much oxygen and iodine would you have in your sample?
Answer:
The body temperatures in degrees Fahrenheit of a sample of adults in onle small town are 96.6 99.6 96. 3 97.3 99.8 97.7 97,6 97.9 99.2 Assume body temperatures of adults are normally distributed Based on this data find the 9900 confidence Interval of the mean body temperature of adults in the town Enter Your answer as an Open-interval (i.e. parentheses) accurate to 3 decimal places. Assume the data is from normally distributed population_ 9900 CI = Previewv Tp Enter 4euleie er using intewval notation. Example: [2,5) Uge U fcr unicr to combine interval:, Example: (-00,2] U [4,00} Entet each Faluce nunber (like 33,2.2172) Or 33 calculztion (like 5/3,243 5-4) Enter DNE for ar empty set, Use 00 to enter Infinity. Enter each valze accurate to decial place: Get Help: Points possible: 10 This attempt of 3 Me ye ingtmctor absutthis questin Poelis quesivto 6 EpIC e 6 DeA
Explanation:
(Unsure if this helped but hope it did!)
460 grams of Potassium periodate contains 128 grams of Oxygen and 253.9 grams of Iodine.
What is a compound?A compound is composed of atoms from two or more different elements chemically bonded together in fixed small whole number ratios to each other.
Mass of potassium= 17.0 grams
Mass of Oxygen= 27.8 grams
Mass of Iodine= 55.2 grams.
Mass of Potassium periodate= Mass of Potassium+Mass of Oxygen+Mass of Iodine
Mass of Potassium periodate= 17g+27.8g+55.2g
Mass of Potassium periodate= 100 grams
Therefore, 100 grams of Potassium periodate contains 27.8 grams of Oxygen
1 gram Potassium periodate contains 27.8/100= 0.278 grams of Oxygen
So, 1×460= 460 grams Potassium periodate contains 0.278×460
=128 grams Oxygen
Now,
100 grams of Potassium periodate contains 55.2 grams of Iodine
1 gram of Potassium periodate contains 55.2/100=0.552 grams of Iodine
1×460=460 grams Potassium periodate contains 0.552×460
=253.9 grams of Iodine.
So, 460 grams of Potassium periodate contains 128 grams of Oxygen and 253.9 grams of Iodine.
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Find the empirical formula of a compound containing 26.56% potassium, 34.51% chromium, and the remainder oxygen.
Answer:
K₂Cr₂O₇
Explanation:
Finding % of O
% O = 100% - % K - % Cr% O = 100% - 26.56% - 34.51%% O = 73.44% - 34.51%% O = 38.93%Steps
Change % of each element into grams.Convert grams of each element into moles by dividing grams by molar mass.Divide all moles by the smallest number of moles.If the moles are all whole numbers, then you’re done and that’s your empirical formula.If not, multiply all moles by number such that everything is a whole number.Solving
We have 26.56g of K, 34.51g of Cr, and 39.93g of O
Moles of K, n(K) = 26.56/39.0983 = 0.68 molesMoles of Cr, n(Cr) = 34.51/51.9961 = 0.66 molesMoles of O, n(O) = 38.93/15.9994 = 2.43 molesK = 0.68/0.66 ≈ 1 x 2 = 2Cr = 0.66/0.66 = 1 x 2 = 2O = 2.43/0.66 = 3.5 x 2 = 7The empirical formula is K₂Cr₂O₇
Thermal energy is another name for–
A. sound energy
B. light energy
C. heat energy
D. mechanical energy.
Explanation:
heat energy is another name for thermal energy
-
Solution 1: 0.1 M - Dim Light Solution 2: 0.1M - Bright
Bulb
Which solution from the data table most likely contains a strong acid?
A. Solution 1 is a strong acid due to a large number of dissociated ions.
B. Solution 1 is a strong acid due to a small number of dissociated ions.
C. Solution 2 is a strong acid due to a large number of dissociated ions.
D. Solution 2 is a strong acid due to a small number of dissociated ions.
Answer:
: The conductivity of electrolyte solutions: (a) 0.1 M NaCl (b) 0.05 M NaCl (c) 0.1 M HgCl2. An electrolyte solution conducts electricity because of the movement of ions in the solution (see above). The larger the concentration of ions, the better the solutions conducts. Weak electrolytes, such as HgCl2, conduct badly because they produce few ions when dissolved (low concentration of ions) and exist mainly in the form of molecules.
Explanation:
Using the Equilibrium Solubility Constant
Some carbonate compounds have limited solubility.
MCO3(s) M²+ (aq) + CO3²- (aq)
The solubility constant Ksp for a carbonate compound MCO3, Ksp = 2.5E-7.
A saturated solution of the compound MCO3, is made.
Calculate the concentration of the ions M²+ (aq) and CO32-(aq) in the saturated solution (check the stoichiometry, the
ions will have the same concentration).
Give your answer to three significant figures, using the exponential format, example enter 0.0000382 as 3.82e-5
with no gaps and the -ve e if power is -ve.
Answer:
The solubility product constant (Ksp) describes the equilibrium between a solid and its constituent ions in a solution. The value of the constant identifies the degree to which the compound can dissociate in water. The higher the Ksp, the more soluble the compound is.
Answer:
MCO3(s) M2+(aq) + CO32-(aq) The solubility constant Ksp for a carbonate compound MCO3, Ksp = 2.83E-7. A saturated solution of the compound MCO3, is made.
Explanation: