Answer:
The answer is "Strontium iodide and [tex]SrI_2[/tex]".
Explanation:
In the flames test, two ionic metals give red fire. It was calcium (Ca, which gives a red brick flame) and strontium (Sr, which gives a persistent red flame). Both Ca and Sr respond to insoluble carbonate with ammonium carbonate. Ca and Sr produce insoluble ammonium phosphate phosphates. Even then, the water is reactive with calcium sulfate (CaSO4) whereas the strontium sulfate (SrSO4) is illiquid. Because the metal ion formed 3 precipitates, they can't get Ca, and we have Sr as its metal.
The hexane of its halide gives a violet color which would be typical of iodide (I-).
Strontium iodide is the chemical name of the unknown ionic compound.
Strontium iodide's chemical formula is [tex]SrI_2[/tex].
Which formulas represent ionic compounds and which represent covalent compounds?
Covalent compound:
CsF
Na o
CHN
PCI,
Cao
CHO
NH
WO
lonic compound:
Cs
CdBr,
N
SOS
Answer:
See answer below
Explanation:
This is pretty easy to solve. First you need to understand that an ionic compound is usually formed between a metal and a non metal. This usually happens between elements from group 1 through group 10 or 11 of the periodic table. A covalent compound is always given in non metal elements from the periodic table, and it's usually the elements from group 13 through group 17.
Some compounds there are missing some atoms, but I manage to find this question and saw the atoms missing, so, in my answer you will see the corrected compound. so don't be surprised.
According to what I state above, then the covalent compounds are:
C₆H₅N
PCl₃
C₂H₄O
NH₃
N₂
SO₄²⁻
The ionic compounds are:
CaO
CdBr₂
WO₂
Na₂O
CsF
Hope this helps
7. A number of reactions that take place on the surfaces of catalysts are zero order in the reactant. One example is the decomposition of ammonia on hot tungsten. In one experiment, the partial pressure of ammonia decreased from 21 kPa to 10 kPa in 770 s. (a) What is the rate constant for the zero-order reaction
Answer:
14.29 Pa/s
Explanation:
Given that, for a zero order reaction;
[A] = [A]o - kt
[A] = pressure at time =t
[A]o = initial pressure
k = rate constant
t = time taken
10 * 10^3 Pa = 21 * 10^3 Pa - 770k
10 * 10^3 Pa - 21 * 10^3 Pa = -770k
-11* 10^3 = -770k
k = -11* 10^3/-770
k = 14.29 Pa/s
Write the balanced equation and draw the particulate representation of the following chemical reaction: sodium metal reacts with chlorine gas to produce sodium chloride.
Draw the complete decomposition of 4 molecules of hydrogen peroxide (H2O2) into water and oxygen gas.
Complete the particulate representation of the combustion of methane (CH4) with oxygen to form carbon dioxide (CO2) and water.
Answer:
2Na + Cl2 ------> 2NaCl
4H2O2 --------> 4H2O + 2O2
CH4 + 2O2 -------> CO2 + 2H2O
Explanation:
The balanced chemical equations for the given chemical reactions are given serially i) 2 Na+Cl₂[tex]\rightarrow[/tex] 2 NaCl ii) 4 H₂O₂[tex]\rightarrow[/tex] 4 H₂O + 2 O₂ iii)CH₄ +2 O₂[tex]\rightarrow[/tex]CO₂ +2 H₂O
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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How many grams of O2 are formed from 13.34 moles of KClO3? Provide your final answer rounded to two decimal places.
2 KClO3 → 2 KCl + 3 O2
Answer:
640.32 g
Explanation:
2KClO₃ → 2KCl + 3O₂
First we convert KClO₃ moles to O₂ moles, using the stoichiometric coefficients:
13.34 mol KClO₃ * [tex]\frac{3molO_{2}}{2molKClO_{3}}[/tex] = 20.01 mol O₂Then we convert O₂ moles to grams, using its molar mass:
20.01 mol O₂ * 32 g/mol = 640.32 gSo 640.32 g of O₂ are formed from 13.34 moles of KClO₃.
Describe the breeding place, type of fertilization, and development of the
embryo of the selected animals listed in the table below.
Table 2. Reproduction and Development in Selected Animals
help help
patulong po
Answer:
Breeding is defined as the process of mating or sexual reproduction between two organism to produce an offspring.
Fertilization is the process in which eggs and sperm fuse together to form a zygote.
After fertilization, embryo development takes place inside females body and form a whole new organism or plant.
In the given examples:
Milkfish:
Breeding place land or water: water
Fertilization external or internal: internal
Development of embryo (outside or inside) the female's body: outside
Cat:
Breeding place land or water: Land
Fertilization external or internal: internal
Development of embryo (outside or inside) the female's body: inside
Frog:
Breeding place land or water: Land
Fertilization external or internal: inside
Development of embryo (outside or inside) the female's body: outside
Duck:
Breeding place land or water: Land
Fertilization external or internal: Internal
Development of embryo (outside or inside) the female's body: Outside
Cow:
Breeding place land or water: Land
Fertilization external or internal: internal
Development of embryo (outside or inside) the female's body: inside
Liquid hexane CH3CH24CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose 4.3 g of hexane is mixed with 25.8 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round your answer to 2 significant digits.
Answer:
13g of CO₂ is the maximum amount that could be produced
Explanation:
The reaction of hexane with oxygen is:
C₆H₁₄ + 19/2O₂ → 6CO₂ + 7H₂O
Where 19/2 moles of oxygen react per mole of C₆H₁₄
To solve this question we need to find theoretical yield finding limiting reactant :
Moles C₆H₁₄:
4.3g C₆H₁₄ * (1mol / 86.18g) = 0.0499 moles
Moles O₂:
25.8g * (1mol / 32g) = 0.806 moles
For a complete reaction of 0.0499 moles of C₆H₁₄ are needed:
0.0499 moles of C₆H₁₄ * (19/2 mol O₂ / 1mol C₆H₁₄) = 0.474 moles of O₂.
As there are 0.806 moles, O₂ is in excess and C₆H₁₄ is limiting reactant
In theoretical yield, the moles of hexane added = 6Moles of CO₂ produced. Moles of CO₂ are:
0.0499 moles C₆H₁₄ * (6mol CO₂ / 1mol C₆H₁₄) = 0.299 moles CO₂
In grams:
0.299 moles CO₂ * (44.01g / mol) = 13g CO₂
13g of CO₂ is the maximum amount that could be produced
Observation of balloon rub with cloth?
Answer:
When rubbing a balloon with a wool cloth, it puts negative charges on the balloon. Negative charges attract to positive charges. ... When both balloons are rubbed with the wool cloth, the both receive negative charges, so they will repel each other.
what was the area of the himalayas like 40 million years ago
Answer:
yeskkfslszv
Explanation:
frgkkfsssssssss
Answer:
They were relatively flat.
How is a magnetic field produced?
O when an electromagnetic field interacts with a magnet
O when a current runs through a conductor
O when an object has an electric charge
O when electrons move through a circuit
Answer:
A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. ... Magnetic fields are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin.
Answer: when an electromagnetic field interacts with a magnet
Explanation:
Over an interval of 2.0 s the average rate of change of the concentration of C was measured to be 0.0540 M/s. What is the final concentration of A at the end of this same interval if its concentration was initially 2.000 M
Answer:
Explanation:
the average rate of change of the concentration =
( initial concentration - final concentration ) / time
Initial concentration = 2.000 M
the average rate of change of the concentration = .0540 M/s
time = 2 s
Putting the values
.0540 = (2.000 - X ) / 2
0.108 = 2.000 - X
X = 1.892 M .
Final concentration = 1.892 M .
1. How many grams are there in 1.5 x 10^25 molecules of CO2?
Answer: 1.1 kg
Explanation:
Mw CO2 is 44g —> 6.02214076*10^23 molecules
1.5*10^25 molecules —> 1.1 kg
what information is given on a material safety data sheet?
Answer:
The MSDS lists the hazardous ingredients of a product, its physical and chemical characteristics (e.g. flammability, explosive properties), its effect on human health, the chemicals with which it can adversely react, handling precautions, the types of measures that can be used to control exposure, emergency and first
Explanation:
just put:- it lists the hazardous ingredints- its effect on human health- how the chemicals react to it- how to hanle- how to control exposuresHOPE THIS HELPS!BRAINLIEST?List the 4 cell structures from largest to smallest
Answer: The smallest structure is the double helix while the largest is the chromosome.
2. G2 phase is the third stage in cellular division wherein the cell prepares itself for the M phase.
3. Interphase comprises of 3 phases, namely, G1 phase, G2 phase, and S phase.
4. Metaphase is known to take less amount of time to complete.
Explanation:
1. The double helix of the DNA or deoxyribonucleic acid, nucleosome, coil, supercoil, and the chromosomes are all linked to the DNA and they vary in their sizes. The nucleosome is known to be the basic unit of the eukaryotic chromosome that is composed of DNA coiled around the histones. The supercoils and coils indicate to the structures which are derived from the folding as well as wrapping of the structure of the DNA. The chromosome refers to the thread-like structure which is made up of nucleic acid and is observed in the nucleus of the living organisms.
2. Cell cycle refers to the cellular division of the cell; it is the series of events which occurs within a cell that results in duplication of the DNA or deoxyribonucleic acid as well as division of the cytoplasm and other organelles in order to generate two daughter cells. This cycle comprises of 4 phases, namely, G1, S, G2, and M phase.
The cell enters the G1 phase wherein the cell synthesizes the proteins as well as mRNA or messenger ribonucleic acid in preparation for the next upcoming phases which lead to mitosis. Next stage is the S phase wherein the synthesis of DNA takes place.
G2 phase is the next phase wherein the cell prepares itself by allowing it to grow as well as generate new proteins needed for the next phase called M phase. Mitosis is the final stage wherein the two identical daughter cells are made from one parent cell.
3. The cell cycle is broadly segregated into 3 phases, namely, interphase, M phase, and cytokinesis. Interphase is the longest stage of the cellular cycle and it comprises of 3 phases, G1 phase, S, and G2 phase. There is a G0 phase or quiescent phase. During the G1 phase, the cell prepares itself for the next phases of cell cycle, S phase involves synthesis of DNA, and G2 is the production of new proteins needed for the M phase.
4. During the mitotic phase, the parental cell segregates and produces 2 identical daughter cells. This phase is further segregated into prophase followed by metaphase, anaphase, and finally telophase. During metaphase, the chromosomes align themselves onto the equatorial or metaphase plate and the centrosomes prepare to segregate the sister chromatids. This phase takes only about 4% of the time needed to finish the entire cell cycle.
Explanation:
Which of the following statements about semi-empirical methods are true?
a. It combines a theoretically sound model of bonding with some experimentally determined parameters.
b. It is faster to calculate than ab initio methods.
c. It can determine precisely both the location and the energy of bonding electrons.
d. It treats bonds simply as springs.
Answer:
a
Explanation:
The correct statement about semi-empirical methods is
It combines a theoretically sound model of bonding with some experimentally determined parameters.
These methods are typically referred to by acronyms which encode some of the underlying theoretical assumptions.
Oxidation of a dithiol such as 2,5-hexanedithiol forms a six-membered ring containing a disulfide group as part of the ring. Draw the structure of this cyclic disulfide (Hint: Draw the starting compound in line structure format first).
Answer:
See picture below
Explanation:
In general terms, oxidation of thiol are rather different than oxidations with alcohols.
A dithiol is a molecule that has two thiols in an organic compound. In the case of the 2,5 hexanedithiol, we have the thiols in the carbon 2 and carbon 5.
When oxidation of thiols occurs, and depending of the number of thiols in the molecule, the final compound will have a sulfide group.
This is because the oxydation makes that the hydrogen atom of the sulfur is substracted. So, in the case of the dithiols, we have that both hydrogen atoms are substracted and then, they are available to join. Therefore, As the thiols are in the same molecule, it will occur a self condensation reaction.
The picture below will show the final product.
Hope this helps
Oxidation of a dithiol such as 2,5-hexanedithiol forms a six-membered ring containing a disulfide group as part of the ring. The structure of the cyclic disulfide that is 2,5-hexanedione is shown below.
Oxidation is a chemical reaction that involves the loss of electrons by a molecule, atom, or ion. This process results in an increase in the oxidation state of the species undergoing oxidation.
The oxidation of 2,5-hexanedithiol is a chemical reaction in which the thiol [tex]\rm (-SH)[/tex] groups of the molecule are converted into disulfide[tex]\rm (-S-S-)[/tex] bonds, resulting in the formation of 2,5-hexanedione. This reaction usually requires an oxidizing agent, such as hydrogen peroxide or nitric acid.Therefore, the structure of cyclic disulfide(2,5-hexanedione) is shown below.
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Given the following steps for a mechanism:
Step 1: O3 + NO = NO2 + O2 (slow)
Step 2: NO2 + O = NO + O2(fast)
Define mechanism.
Explanation:
Prokaryotes have the advantages associated with greater simplicity, including more rapid reproduction, rapid mutation and adaptation to new environments, and more diverse metabolic systems. They also possess an ability to pass on adaptive genes to other bacteria in the form of plasmids.
Which has more calories: table sugar or aspartame?
Hello there!
Aspartame has 4 kilocalories of energy per gram and table sugar has 3.9 kilocalories. They are pretty much same but aspartame is 200 times sweeter than sucrose so probably would be aspartame that has more calories.
Heat will continue to move until the objects or areas have reached the same ______.
Answer: Thermal Equilibrium
Explanation:
Answer:
temperature
Explanation:
I think that's it i'm sorry if i'm wrong
Which is the correct molar mass for the compound h2SO4
Explanation: just add the atomic masses on the periodic table together for each atom.
Answer:Sulfuric acid
Explanation:because I said so
Which group of elements is listed in order of decreasing size? O oxygen, nitrogen, carbon, boron O xenon, krypton, argon, neon O carbon, silicon, germanium, tin O lead, thallium, mercury, gold
Answer:
oxygen, nitrogen, carbon, boron
Explanation:
Racecar driver Keimesha was in a race and accelerated from rest to 39 m/s by the time she reached the finish line. Keimesha’s car moved in a straight line and traveled from the starting line to the finish line in 6.0 seconds. What was the acceleration of the dragster?
Answer:
the acceleration of the racecar is 6.5 m/s²
Explanation:
Given;
initial velocity of the racecar, u = 0
final velocity of the racecar, v = 39 m/s
time of motion, t = 6.0 s
The acceleration of the racecar is calculated as;
[tex]a = \frac{v-u}{t} \\\\a = \frac{39-0}{6} \\\\a = \frac{39}{6} \\\\a = 6.5 \ m/s^2[/tex]
Therefore, the acceleration of the racecar is 6.5 m/s²
Which of the following does not describe a chemical property?
A. Gasoline burns.
B. Gold does not react with oxygen.
C. Bleach is poisonous when swallowed.
D. Lead is more dense than gold.
The one that does not describe a chemical property is bleach is poisonous when swallowed. The correct options are C.
What are chemical properties?Chemical properties are those properties that show the reactivity of an element. These chemical properties are pH, chemical stability, reactivity, radioactive decay, flammability, toxicity, etc.
Gasoline is a chemical compound, its burning will be a chemical property because it shows how it reacts when it comes in contact with another chemical.
Gold is a pure element, its reactivity tendency is a chemical property, and it is not reactive with oxygen. Density is also a property of an element. And lead is denser than gold, which will show a chemical property.
Thus, the correct options are C. Bleach is poisonous when swallowed.
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Rearrange each jumbled letters
1. EMITNGL IPTNO
2. USLTBIAOMNI
3. RZFENIGE OTPNI
4. ENSODIOTIP
5. ETHA
Answer:
1. MELTING POINT
2. SUBLIMATION
3. FREEZING POINT
4. DEPOSITION
5. HEAT
Explanation:
i need help with this science pls
Answer:
1)40n
2)25n
Explanation:
subtract the numbers if its on the opposite sides and add if its on same side
thank u hope it helps
Please explain to me!!!
Answer:
nice handwrtting
Explanation:
Please answer this. List the three most abundant minerals in this bottle of mineral water.
What is a net ionic equation?
A. An equation that shows all substances as compounds
B. An equation that is balanced on both sides
C. An equation showing only what is involved in the reaction
D. An equation that shows all dissolved compounds as ions
Answer:
I think it will option D hope it helps
what is the atomic number for meitnerium
Answer:
"Meitnerium/Atomic number""109"Explanation:
Meitnerium, the topic of this podcast, with the symbol Mt and atomic number 109, sits in the middle of this band in group 9 underneath cobalt, rhodium and iridium.
Hope this is fine for youwhat is a arieal animals?
A student increases the temperature of a 200 cm balloon from 60°C to 120°C.
What will the new volume of the balloon be?
A)100cm^3
B)200cm^3
C)263cm^3
D)400cm^3
Answer:
236 cubic cm
Explanation:
We are given that
Initial volume, V1=200 cubic centimeter
Initial temperature, T1=60 degree Celsius=60+273=333 K
Final temperature, T2=120 degree Celsius=120+273=393 K
Kelvin temperature=Celsius temperature+273
We have to find the new volume of the balloon.
We know that
Charles's law
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
Using the formula
[tex]\frac{200}{333}=\frac{V_2}{393}[/tex]
[tex]V_2=\frac{200\times 393}{333}[/tex]
[tex]V_2=236cm^3[/tex]
Hence, the new volume of the balloon will be 236 cubic cm.