CHEMISTRY HIGH SCHOOL

Which of the following materials is useful for making molds because it has a low melting point?A. wood
B. metal
C. clay
D. wax

Answers

Answer 1
Answer: Molds are created to achieve aspecific design of a material. These materials either came from a process ofhaving a higher or lower temperature. Therefore, the molder must have thermalresistant properties. Low melting points means that the material to be shapedcame from a cooler process. Wood and metal have higher thermal conductivity andtherefore can easily be cooled. The wax can turn really hard and can beunbreakable when present in colder materials due to the lipids present in it. Clayhowever can become a mold because of its low melting point.
Answer 2
Answer:

The right answer is wax.

The waxes are of synthetic, natural, animal or plant origin composed of long and branched chains which gives them a microcrystalline structure. This results in a soft, white, non-translucent substance whose melting temperature is arround 70 ° C.

The melt temperature of the clay exceeds 1000 ° C.

It is clear that wood and metal are not used for low temperature molding.

Related Questions

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Explain why the elements of groups 1 and 7 are mostly used in
the form of compound

Answers

Group 1 and group 7 of element group consists of alkali metal, which are generally combined with other elements in nature, so they have properties of compound

A maritime polar air mass is a cold air mass that forms over which two oceans

Answers

Answer:

The correct answer is Pacific and Atlantic oceans.

Explanation:

When an air body of a specific site or region reflects the temperature and other climatic condition of water and land it is known as air mass. The air substitutes heat with the water or the land, till the temperature of the air becomes equivalent to that of the surface underneath it. A maritime polar air mass refers to the air mass, which gets produced over the Northern Pacific oceans and the Northern Atlantic oceans. This is accountable for bringing a mass of cold air into the mentioned oceans.
northern atlantic and northern pacific oceans

7. (1 point) Colligative properties are directly related to the ____. *freezing point of a solute
nature of the solute
nature of the solvent
number of solute particles in a solution
8. (1 point) What is the formula for sulfuric acid? *
H₃SO₄
H₃SO₃
H₂SO₄
H₂SO₃
9. (1 point) Which of the following is an Arrhenius base? *
CH₃COOH
HSO₄⁻
LiOH
NH₄⁺
10. (1 point) A Lewis base is a substance that can ____. *
accept a pair of electrons
accept a hydrogen ion
donate a hydrogen ion
donate a pair of electrons
11. (1 point) Which compound is amphoteric and can act as both a Brønsted-Lowry acid and a Brønsted-Lowry base? *
ammonia
hydrochloric acid
sodium hydroxide
water
12. (1 point) What are the bases in the following equilibrium reaction? CN⁻ + H₂O ⇄ HCN + OH⁻ *
CN⁻ , H₂O
CN⁻, OH⁻
H₂O, HCN
H₂O, OH⁻
13. (1 point) The products of the self-ionization of water are _______. *
H₃O⁺ and H₂O
OH⁻ and OH⁺
OH⁺ and H⁻
OH⁻ and H⁺
14. (1 point) What type of solution is one with a pH of 10? *
acidic
basic
neutral
The type varies depending on the solution.
15. (1 point) The base dissociation constant is only found for ________. *
Concentrated bases
Dilute bases
Strong bases
Weak Bases
16. (1 point) A 18M solution of an acid that ionizes only slightly in solution would be termed_________. *
concentrated and weak
strong and dilute
dilute and weak
concentrated and strong
Short Answer / Essay Questions
Please answer the following with complete sentences If there is math involved please show all of your work -The work is worth at least 1 point.
17. (3 points) If the solubility of a gas is 5.6 g/L at 505 kPa pressure, what is the solubility of the gas when the pressure is 1010kPa? *

18. (4 points) You have your choice of sucrose, C₁₂H₂₂O₁₁, sodium chloride, NaCl, or calcium chloride, CaCl₂ to use to melt the ice on the driveway. Explain why each choice will melt the ice, but also include which is the best choice and why. *

19. (3 points) Calculate the [H⁺] for the aqueous solution in which [OH⁻] is 1 x10⁻⁹. Is this solution acidic, basic or neutral? Show your work *

20. (3 points) What is an acid dissociation constant? When can it not be calculated and why? *

21. (4 points total) Classify each solution as either an acid or a base using the properties that are stated. What are two ways these solutions are similar? Solution A – has a bitter taste and feels slippery Solution B – has a sour taste and feels sticky.

Answers

7. Colligative properties are directly related to the number of solute particles in a solution
8. chemical formula of sulfuric acid is H2SO4
9. the arhenius base in the choices is LiOH
10. A Lewis base is a substance that can donate a pair of electrons
14. basic
15. weak base

What is the 112th element

Answers

Symbol: Cn
Element: Copernicium 
Atomic mass: [277]
Atomic number: 112
The 112th element is found on the periodic table by the name of 'Copernicium'.

Answer: Copernicium

The particles in a ____________________ have an orderly, fixed arrangement.

Answers

The particles in a solid have an orderly, fixed arrangement.

Sheela wants to make a computer model of a land ecosystem. Part of her model simulates the chemical processes of photosynthesis that involve the creation of sugars. Which of these chemical processes are these?A. the light-dependent reactions
B. the light-independent reactions
C. the dark reactions
D. the reactions in the mitochondria

Answers

The correct answer is A, the ligt-dependent reactions. These reactions are responsible for the production of glucose molecules, by the utilization of carbon dioxide, and water along with the sunlight. Glucose is then broken down during resiration process, for the production of ATP in mitochondria.

B. the light-independent reaction is the correct answer in Edgen
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