3. When trying to spear a fish in water, a person needs to take into account the way light bends as it moves from water into air. The bending of light as it passes from one medium into another is known as — reflectionrefraction diffractionpolarization

4. The pitch of a sound made by plucking a guitar string is determined by the – strength of the plucking force distance between the strings frequency of the vibration produced shape of the guitar body

5. A pipette is filled with 19.4 ml of a 35% NaOH solution. The solution is at 22°C and has a density of 1.23 g/mL. According to this information, what is the mass of this NaOH solution? 23.9 g3.88 g 15.7 g24.6 g

6. Elements in Group 17 of the periodic table usually- act like metals solidify at room temperature form large molecules gain an electron when bonding

7. According to the following information, what is the chemical formula for magnesium phosphate? Mg 2+ PO 4 3- MgPO 4 Mg 3 (PO 4 ) 2 Mg 2 (PO 4 ) 3 Mg 2 PO 4

8. In this apparatus, the seawater is an example of a - weak acid strong electrolyte nonelectrolytestrong base

9. An unknown silvery powder has a constant melting point and does not chemically or physically separate into other substances. The unknown substance can be classified as- an element a mixturean alloy a compound

10. Hydrogen (H 2 ) is an example of – an alloy a salt a moleculea mixture

11. Pain medications can be made as powders or tablets. The tablets tend to work slower than powder with the same ingredients because a tablet- dissolves slower in solution than powder is easier to swallow than powder has more total mass than powder travels through the bloodstream more easily

12. Which factor makes water an effective solvent? The presence of molecular oxygen Its lack of covalent bonds The polar nature of its molecules Its abundance on Earth’s surface

13. The table shows temperature and pressure in four containers holding the same amount of water: According to the table, in which container can the most sodium chloride be dissolved in the water? QR TS ContainerTemperature (°C) Pressure (kPa) Q10204.5 R20204.5 S30101.3 T40101.3

14. The moon’s surface becomes hot during the long lunar day because the sun transfers heat to the moon. This heat transfer is accomplished almost entirely through the process of — convectionrefraction radiationconduction

15. A certain commercial product used for cleaning ovens must be handled with rubber gloves. The product is slippery and turns litmus paper blue. It probably contains an acida base a saltan isotope

16. During an investigation, students accelerated boxes using different forces and then determined the masses of the boxes. What is the mass of a box that requires 0.1 N to make it accelerate 2 m/s 2 ? 0.05 g50 g 20 g0.02 g

17. What is the efficiency of a machine if there is a work input of 320 J and a work output of 80J? 25%4% 400%240%