Chemistry Middle School
Answers
Answer 1
Even though it may still form compounds with other elements, iodine is the least reactive and most electropositive halogen. Iodine quickly transforms into a purple mist when heated. Iodine is only marginally soluble in water, however it dissolves in other solvents, such as carbon tetrachloride.
What is iodine ?
Chemical element iodine has the atomic number 53 and the letter I in its symbol. It is the heaviest stable halogen and is present as a non-metallic, semi-lustrous solid. It is not a chemical reaction to heat purple iodine crystals to create purple gas.
The lighter halogens' fluorine, chlorine, and bromine are comparable to iodine chemically. But it has a totally different physical look. It is a steel-gray solid that, when heated, transforms into lovely purple vapors.
It is added to supplements and various salt seasonings in addition to occurring naturally in some meals. The thyroid hormones thyroxine and triiodothyronine, which help in the production of proteins and enzyme function as well as controlling normal metabolism, are made from iodine.
Thus, Iodine quickly transforms into a purple mist when heated.
To learn more about iodine, follow the link;
brainly.com/question/16867213
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Answer 2
Answer:
Crystals are a mastallic gray.It dissolves and alcohol.It forms a violet-colored gas.
Explanation:
Related Questions
WHAT IS THE FORMULA FOR QUICK LIME
Answers
CaO is the chemical formula for quick lime
The website of a popular stargazers club notes that on Wednesday the moon will rise at 6:23 PM and set at 6:12 PM on Thursday. What is a mistake in this information? A)The moon sets before 6:00 PM everyday
B)The setting time should have been 6:12 AM
C)The moon rises only after 9:00 PM everyday
D)It is difficult to predict when the moon would set
Answers
Answer:
the answer is B
Explanation:
It's C that's correct because it's very true...
Conc. H2SO4 has a density 1.9g/ml and is 99% H2SO4 by weight. Find molarity of solution
Answers
Answer: The molarity of the solution comes out to be 19.19 M.
Explanation:
We are given:
99% m/m . This means that 99 grams of sulfuric acid is present in 100 grams of solution.
Density of solution = 1.9 g/mL
To calculate the volume of the solution, we use the equation:
Density of solution = 1.9 g/mL
Mass of solution = 100 g
Putting values in above equation, we get:
To calculate the molarity of a solution, we use the equation:
Given mass of sulfuric acid = 99 g
Molar mass of sulfuric acid = 98g/mol
Volume of solution = 52.63 mL
Putting values in above equation, we get:
Hence, the molarity of the solution comes out to be 19.19 M.
What is monobromoalkane
Answers
Answer:
Monobromoalkane is also known as alkene, or C=524. It has an undecided structure.
2) Which of the following is a synthesis reaction? (1) Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
(2) 2Cu +02→ 2Cuo
(3) CucoO3 → CuO + CO2
(4) CuO + H2 → Cu + H2O
Answers
Answer:
(4) CuO + H₂ → Cu + H₂O.
Explanation:
(1) Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag.
It is considered as a single replacement reaction that Cu replaces Ag in its salt AgNO₃.
(2) 2Cu + O ₂ → 2CuO.
It is a combustion reaction that Cu reacts with oxygen results CuO.
(3) CuCO₃ → CuO + CO₂.
It is a decomposition reaction that CuCO₃ is decomposed to CuO and CO₂.
(4) CuO + H₂ → Cu + H₂O.
It is considered as a synthesis reaction that two reactants CuO and hydrogen are reacted to produce Cu and H₂O.
So, the right choice is: (4) CuO + H₂ → Cu + H₂O.
Answer:
The reaction (4) CuO + H₂ → Cu + H₂O is considered as a synthesis reaction because CuO and hydrogen H₂ are reacted to produce Cu and H₂O.
Explanation:
A synthesis reaction occurs when two different atoms or molecules interact to form a different molecule or compound.
The general form for this type of reactions is:
A + B __ AB
A and B are two different chemical substances that combine to form a new product (AB). In a synthesis reaction the chemical bonds between the reagents are broken and new bonds are formed, giving rise to a different compound.
In this case, the reaction CuO + H₂ → Cu + H₂O is considered as a synthesis reaction because CuO and hydrogen H₂ are reacted to produce Cu and H₂O.
On the other side:
- (1) Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
A simple substitution reaction or simple displacement reaction, called single-displacement reaction, is a reaction in which an element of a compound is substituted by another element involved in the reaction. The general form of a simple substitution reaction is:
AB + C __ A +BC
where C and A are pure elements; C replaces A within compound AB to form a new co, placed CB and elementary A.
This is the type of reaction that happens in this case.
- (2) 2Cu +02→ 2CuoO
Combustion reactions are reactions where oxygen intervenes as a reagent. Oxygen has the ability to combine with various elements to produce oxides, where then oxidation is the combination of oxygen with another substance. There are oxidations that are extremely slow, but when oxidation is rapid it is called combustion.
This is the type of reaction that happens in this case.
- (3) CucoO3 → CuO + CO2
In a decomposition reaction, a single substance decomposes, producing two or more different substances. The atoms that form a compound are separated to give the products according to the formula:
AB → A + B
This is the type of reaction that happens in this case.
Help please ❤️ When O2 is added to the melted candy mixture once it has cooled. Why would it not be beneficial to add the CO2 after it is first melted?
Answers
it wouldnt have an effect?
WILL BE THE BRAINIEST GUARANTEED. Emily wants to show that she knows the shapes of galaxies. She takes a tennis ball and makes a small cut in it to release the air inside. She then takes it and tries to flatten it our on the table by pressing down on it. What type of galaxy is she trying to model?
Spiral
Elliptical
Irregular
None of the above
Answers
Answer:
Elliptical
Explanation:
Elliptical galaxies are a type of galaxy with an ellipsoidal shape and a smooth image with little to no features. Ellipsoidal shapes look like slightly squished spheres, just like a compressed tennis ball would look like.
Answer: She is trying to model an elliptical galaxy
Explanation:Elliptical galaxies are football shaped, fat in the center and tapered toward the ends. Stars in an elliptical galaxy spread out evenly from the galaxy's center. The largest galaxies in the universe are giant elliptical galaxies which may have more than 1 trillion stars. Some elliptical galaxies are as much as 20 times bigger than the Milky Way.
Elliptical galaxies appear reddish, indicating that they are formed by stars which are older and cooler than our own sun.
Elliptical galaxies, such as M87 (left), have very little gas and dust. Because gas and dust are found in the clouds that are the birthplaces of stars, we should expect to see very few young stars in elliptical galaxies. In fact, elliptical galaxies contain primarily old, red stars (also known as Population II stars).
Elliptical galaxies vary widely in size. Both the largest and the smallest known galaxies are elliptical. Very large elliptical galaxies can reach 300 million light years in diameter. Dwarf ellipticals, which are very common, may contain only 1/100,000th as many stars as the Milky Way!
MAKE ME THE BRAINLIEST
Science has determined with some certainty where the ______ are within the nucleus of an atom. A: electrons
B: protons
C: protons and neutrons
D: protons and electrons
Answers
Answer:
C. Protons and neutrons. They are located in the nucleus f an atom while the electrons orbit the nucleus.
An air-filled balloon has a volume of 225 L at 0.940 atm and 25 °C. Soon after, the pressure changes to 0.990 atm and the temperature changes to 0 °C. What is the new volume of the balloon?
Answers
Answer:
The right choice is V₂ = 195.7 L
Explanation:
- We can use the general law of ideal gas: PV = nRT.
where, P is the pressure of the gas in atm.
V: is the volume of the gas in L.
n: is the no. of moles of the gas in mol.
R: is the general gas constant,
T: is the temperature of the gas in K.
If n is constant, and have different values of P, V and T:
(P₁*V₁) / T₁ = (P₂ * V₂) / T₂
Knowing that:
V₁ = 225 L , P₁ = 0.940 atm
T₁ = 25 °C + 273 = 298 K
V₂ = ??? L, P₂ = 0.990 atm
T₂ = 0 °C + 273 = 273 K
applying in the above equation
(P ₁* V₁) / T₁ = (P₂ * V₂) / T₂
(0.940 atm * 225 L) / 298 K= (0.990 atm * V₂) / 273 K
V₂ = (0.940 atm * 225 L * 273 K) / (298 K * 0.990 atm)
V₂ = 195.7 L
So, the right choice is:
V₂ = 195.7 L
Provide the expressions for the equilibrium constant Keq:
CH4(g) + 2H2SE(g) ⇄ 4H2(g) +CSe2(g)
Answers
Answer:
Keq = [H₂]⁴[CSe₂]/[CH₄][H₂Se]².
Explanation:
- The equilibrium constant expression is the ratio of the concentrations of the products over the reactants.
- For the reaction:
CH₄(g) + 2H₂Se(g) ⇄ 4H₂(g) + CSe₂(g).
∴ Keq = [products]/[reactants] = [H₂]⁴[CSe₂]/[CH₄][H₂Se]².
Is CSe2 a gas or liquid?
Answers
Answer:
Liquid
Explanation:
CAN SOMEONE REWRITE/SHORTEN THIS FOR ME PLEASE? I'LL GIVE BRAINLIEST Genetically modified organisms/ GMOs can be defined as organisms in which the genetic material (DNA) has been altered in a way that does not occur naturally by mating and/or natural recombination. The technology is often called “modern biotechnology” or “gene technology”, sometimes also “recombinant DNA technology” or “genetic engineering”. It allows selected individual genes to be transferred from one organism into another, also between nonrelated species. Foods produced from or using GM organisms are often referred to as GM foods.
GM foods are developed and marketed because there is some advantage either to the producer or consumer of these GM foods. This is meant to translate into a product with a lower price, greater benefit ,or both. GM seed developers wanted their products to be accepted by producers and have concentrated on innovations that bring direct benefit to farmers and generally the food industry.
One objective for developing plants based on GM organisms is to improve crop protection. The GM crops currently on the market are mainly aimed at an increased level of crop protection through the introduction of resistance against plant diseases caused by insects or viruses or through increased tolerance towards herbicides.
Resistance against insects is achieved by incorporating into the food plant the gene for toxin production from the bacterium Bacillus thuringiensis. This toxin is currently used as a conventional insecticide in agriculture and is safe for human consumption. GM crops that inherently produce this toxin have been shown to require lower quantities of insecticides in specific situations, where pest pressure is high. Virus resistance is achieved through the introduction of a gene from certain viruses which cause diseases in plants. Virus resistance makes plants less susceptible to diseases caused by such viruses, resulting in higher crop yields.
Answers
Answer:
Here you go! 50% of your writing piece
Explanation:
Foods produced from or using GM organisms are often referred to as GM foods.
GM foods are developed and marketed because there is some advantage either to the producer or consumer of these GM foods. GM seed developers wanted their products to be accepted by producers and have concentrated on innovations that bring direct benefit to farmers and generally the food industry.
One objective for developing plants based on GM organisms is to improve crop protection. The GM crops currently on the market are mainly aimed at an increased level of crop protection through the introduction of resistance against plant diseases caused by insects or viruses or through increased tolerance towards herbicides.
Resistance against insects is achieved by incorporating into the food plant the gene for toxin production from the bacterium Bacillus thuringiensis. GM crops that inherently produce this toxin have been shown to require lower quantities of insecticides in specific situations, where pest pressure is high.
PLZZZZZ HELP ME DECIDE IF THIS TRUE OR FALSE (Flvs) * worth 15 points * An Arrhenius base increases the concentration of hydrogen ions when dissolved in solution. True or False
Answers
Answer:False
Explanation:
Answer:
False
Explanation:
Can someone give me periodic table till 30?
Answers
1. H (Hydrogen)
2. He (Helium)
3. Li (Lithium)
4. Be (Beryllium)
5. B (Boron)
6. C (Carbon)
7. N (Nitrogen)
8. O (Oxygen)
9. F (Fluorine)
10. Ne (Neon)
11. Na (Sodium)
12. Mg (Magnesium)
13. Al (Aluminium)
14. Si (Silicon)
15. P (Phosphorus)
16. S (Sulfur)
17. Cl (Chlorine)
18. Ar (Argon)
19. K (Potassium)
20. Ca (Calcium)
21. Sc (Scandium)
22. Ti (Titanium)
23. V (Vanadium)
24. Cr (Chromium)
25. Mn (Manganese)
26. Fe (Iron)
27. Co (Cobalt)
28. Ni (Nickel)
29. Cu (Copper)
30. Zn (Zinc)
A gymnast jumps from a great height onto a sealed mat filled with air. what happens to the gas particles inside the mat during the impact?
A) the gas particles undergo a chemical reaction
B) the gas particles squeeze closer together
C) the gas particles become smaller
Answers
The gas particles squeeze closer together
B) the gas particles squeeze closer together.
What does the mixture of hot and cold air have to do with the formation of a tornado? (It’s not a multiple choice)
Answers
hot and cold air do not mix well in the sky it separates hot and cold air and just goes in circles and over time it get bigger and stronger
How do scientists test their ideas
Answers
Answer:
They test it using the scientific method.
By actually testing the ideas
Which of the following is not true of chemical changes? (2 points) Flammability and decomposition are examples of chemical changes.
Chemical changes involve a rearrangement of atoms to form new substances.
Chemical changes can often be identified by the formation of a gas or a solid or the release of heat.
Nothing is altered at the molecular level during a chemical change.
Answers
A chemical change means that a new substance was formed. Different from what it was before the change took place.
Flammability and decomposition are examples of chemical changes.
How many grams of H2 are needed to produce 13.33g of NH3?
Answers
The reaction to form NH3 is : N2 + 3H2-> 2NH3 12,33g NH3 is 12,33/17,03=0,3 =0,724 moles of NH3 moles NH3. So you need 1,5*0,724 = 1,086 moles H2 1,086*2,016 = 2,189 g of H2 is needed ro form 12,33 g NH3
Which of the following is the correct formula for nitrogen trifluoride
Answers
Answer:NF3 is the correct formula for nitrogen trifluoride.
Explanation: