a Correct Answer 210⁄84 Po → X + 4⁄2 He

a. 206/82 Pb

b. 214/86 He

c. 218/84 At

d. 214/86 Pb

B Correct Answer White blood cells contain many _________ because they need to dispose of harmful intruders such as bacteria and viruses. Which of the following options correctly completes the statement above?

a. Mitochondria

b.lysosomes

c.ribosomes

d.Golgi

B Correct Answer What is the hypothesis proposed in the experiment above?

a. UV-Vis spectroscopy is used to measure the concentration of naproxen in water after samples are treated with hydrogen peroxide (H2O2).

b.In this paper, H2O2 is proposed to oxidatively degrade the anti-inflammatory drug, naproxen when it is dissolved in water.

c.Experiments were conducted to test the influence of H2O2 concentration, reaction time, and temperature on the degradation of naproxen.

d. Thus, we can conclude that hydrogen peroxide can be used to degrade naproxen in wastewaters.

C Correct Answer The primary function of the ________________ is to deliver blood to the brain.

a. Subclavian artery

b.aorta

c. carotid artery

d. brachial artery

C Correct Answer The molecular formula for baking soda is NaHCO3 This molecule is made up of 6 ____ and 4 __________?

a. atoms; electrons

b. elements; atoms

c. atoms; elements

d. electrons; atoms