VERY SHORT QUESTIONS
1. Write different states of matter
2. Which has more density - liquid or solid?
3. What is the melting point ofice?
.
5. Why do gas exert pressure?
6. How do we liquefy the gases?
4 Boiling point of alcohol is 78°C Change it into Kelvin scale?
7. What happens to particles when salt dissolves in water?
8. What is the physical state of water:
(a) at 0°C
(b) 25°C
9. What is the chemical name of dry ice?
Why is heat energy needed to melt a solid ?
10.
Answers
Answer:
jaisi is not an issue of my favorite to do this but not in use it in your area is not an option in your company in the same as last year of the individual 2222nsjsjahsbxvx hai this is not working on this one looks like I said it to a friend and a few weeks and a good idea how do not want me the link for your email and delete the message to be
Answer:
ans 1 the three states of matter are solid , liquid and gas
ans 2 solid has more density
ans 3 that the temperature at which ice melts is called the melting point. The melting point is the temperature at which a solid turns to a liquid. The melting point at which ice — a solid — turns to water — a liquid — is 32°F (0°C).
ans 5 Gas pressure is caused by the force exerted by gas molecules colliding with the surfaces of objects (Figure 1). Although the force of each collision is very small, any surface of appreciable area experiences a large number of collisions in a short time, which can result in a high pressure
ans 6 In general, gases can be liquefied by one of three methods: (1) by compressing the gas at temperatures less than its critical temperature; (2) by making the gas do some kind of work against an external force, which causes the gas to lose energy and change to the liquid state; and (3) by making gas do work against
ans 7 When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules. ... Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together.
ans 8 at 0°C
ans 9 Dry ice is the solid form of carbon dioxide (CO2), a molecule consisting of a single carbon atom bonded to two oxygen atoms.
ans 10 It is an important greenhouse gas and in it's solid state, it's called dry ice. Carbon Dioxide- CO2 is a chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom. ... Carbon Dioxide, CO2, exists as a gas at STP and is generally exhaled by animals and used by plants during photosynthesis