Std 4 - 1st 19 questions

1. Std 4 - 1st 19 questions Grade: «grade» Standard 4 - Gas Laws Subject: «date» Date:

2. ANSWERS ARE ON THE LAST PAGE OF THIS FILE ANSWERS ANSWERS ANSWERS

3. 1 4.a.) students know the random motion of molecules and their collisions with a surface create the observable pressure on that surface. What causes the pressure on the inside walls of the container? A charge of the gas molecules in the container B temp. of the gas molecules in the container C collision of the gas molecules on the container D weight of the gas molecules on the container

4. 2 How do the properties of the gas differ from those of a liquid? A gas molecules have a greater random motion than liquid molecules B gas molecules have less energy that liquid molecules C gas molecules have more mass than liquid molecules D gas molecules put more pressure on the walls of a container than liquid molecules

5. 3 What does the random motion of molecules and their collisions with a surface produce? A mass B phace change C pressure D weight

6. 4 What causes a balloon to hold its shape? A random motion of the gas molecules B collision of gas molecules against balloon's walls C weight of the gas molecules inside of a balloon D energy held by each gas molecule within the balloon

7. 5 4.b.) Students know the random motion of molecules explains the diffusion of gases Which causes the addition of colored gas to change the color of all the gas in a container? A diffusion B mass C pressure D tempreture

8. 6 Diffusion is the term used to describe the movement of one material through another. The diffusion of gases can be explained by A relative molar masses B differences in volume C evaporation D random motion

9. 7 Which is example of diffusion? A disappearance of a puddle sunlight B smell of ratton egg acoss a room C filled balloon that shrinks over time D balloon that shrinks when it becomes cold

10. 8 Which is not example of diffusion? A boiling of watar B smell of food cooking C colored gas moving throughout a room D poisonous gas leaking from an open container

11. 9 4.c.) Student know how to apply the gas loss to relations between the pressure, temperature, and volume of any amount of ideal gas or any mixture of ideal gases Charles's law explains the relationship between the temperature and volume of a gas. Which graph best represents this relationship? A C B D

12. 10 How are pressure and volume of a gas related? A as pressure decreases, volume increases B as pressure increases, volume increases C as pressure decreases voplume decreases D pressure and the volume are not realted

13. 11 Which of this decreases as the given volume of gas increases? A number of gas particles B temperature C pressure D kinetic energy

14. 12 There are two containers of two different gases at the same tmperature and pressure. Each statement below can be assumed except A when the temperature increased, the volume of both containers will increases B when th pressure is increased, the volume of both containers will decreases C both containers contain the same number of gas particles D when the pressure is decreased, the temperature of both containers will increase

15. 13 4.d.) Students know the values and meanings of standard temperatures and pressure (STP). Standard temperature and pressure (STP) helps scientists to A compare gases B compare liquids C calculate ionic changes D calculate entropy

16. 14 Standard temperature and pressure (STP) occurs at A 32oF B 100oF C 273 oF D 373 oF

17. 15 Standrad temperature and pressure (STP) occurs at A 273 oC B 273 K C 0 oF D 100 F

18. 16 Standard temperature and pressure (STP) occurs at A 76 atm. B 76 mm Hg. C 760 atm D 760 mm Hg.

19. 17 Standard temperature and pressure (STP) occurs at A 14.7 atm B 14.7 mm Hg. C 14.7 psi. D 14.7 torr.

20. 18 4.e) students know how to convert between the Celsius and Kelvin temperature scales How do the units in the Kelvin scale and the Celsius scale compare? A the kelvin units are smaller than the Celsius units B the kelvin units are larger than the celsius units C the units are equal for both scales D the scales are 100 units apart

21. 19 What is freezing point of water in kelvins? A 32K B 100K C 212K D 273K

23. ANSWERS: 1. C 2. A 3. C 4. B 5. A 6. D 7. B 8. A 9. B 10.A 11. C 12. D 13. A 14. A 15. B 16. D 17. C 18. C 19. D