What property of water helps living ol2996xepx ,hg m;qfiz rganisms maintain their internal body temperaglx6qif9e xmz ;h2p9,ture?

  Which of the following is not soluble in t is9rfsrs9tafc,4;: water?

  What substances are attracted th h2ew-i4gfi )o water and form intermolecular bonds with water moleculeh4w2 heg) -ifis?

  Which of the following is a reason for the re. xrqm2f ;hpk7 smny;zcg03/xtention of water on Earth?

  What is the most accepted theory for the origin of ))coh obnnu:.*tj4e l water on Earth?

  What intermolecular bond is responsible for wafx83u7 iq(f5cnhj9cq q. z bm,ter's cohesive, adhesive and therma9qmu q .j,ifn 87x3cqcbfh5z( l properties?

1.Outline how hydrogen bonds form betwrk l-3g .4h.a fnwsoy0een water molecules.

2.State one of the ways how hydrophilic substances interact with water.

3.State one of the ways how non-polar molecules interact with water.

4.Distinguish cohesion and adhesion.

  Which property of water enables marine animals wxq+n s5kp;n au,w)ia q8aa8 +such as the ringed seal (Pusa hispida) to +aaaaw ; 588puxnq ,qkwn)is+ stay afloat in water without expending large amounts of energy?

  The cohesive and adhesive propertigv-- uxk3 jlhq)wmd*9es of water allow xylem vessels to transport water inside3w*gj-vq x)-hk 9ldm u plants.

Which of the following are correct descriptions of how these properties are related to water transport in plants?

  Which of the following is a reason that the Earth is conside5qmi z* 7 rd giin8cw+.xkcblk71 ):ytred to be in ‘The Goldi7gq r.xk*58i7 yl:i bwd t+cmcni )1zklocks zone’, but Saturn is not?

  Which of the following s5hatenp*h(,p) 2 oy.y 5eskts+l lc k-tatements about the dipolarity of the water molecule are true?y5 (e5o *s l.thpy)+a-p tkhekn2lc,s
I. Oxygen attracts the shared electrons stronger than hydrogen.
II.Hydrogen atoms are partially negative.
III.The shared electrons spend more time closer to oxygen.

  Which of the following is not a reason that scientists look for tp-mu;ni,k7vko v6(lk; .n v jtv5)o pfhe presence of water on 6l,t.;;o(konpi5 v7 kjv m -p)v kfuvnplanets as a sign of extraterrestrial life?

  Which term to describe a property of water is matched to its correct definitioa06 l a77sfh5 5fndmr1t *usuin? u i05fts5fm7 sh6ar17na dul*

  The image shows a water strider (G. lacustris) on the surface 4bti o.;js.vjjy;y; rof a pond. What property of wa4yor .stjy;.j;;jiv b ter is not depicted in the image?

Below is a picture of a watervekam9 l+lr;4 strider (Gerris sp.).


1.Explain why the water strider (Gerris sp.) does not sink.
2.Describe, using an example, the importance of water as a solvent in living organisms.

The image shows a ringed seal (Pusa hw7o0 qulv :4 0djr kwy0vh v7u dqn6;t11d*qqcispida) that lives in the Arctic Sea.


1.Distinguish between the physical properties of air and water that allow the seal to mostly live in the sea.
2.Ringed seals glide into the water head first from ice shelves, rather like humans diving into a pool head first. Explain the advantage of entering the water in this way rather than ‘belly-flopping’ into the water.

  An investigation was carriev3*c7+pz fr*m k0z56lb lbanrd out into the effects of household detergents on aquatic habitats. Scientists tested the effect of different household detergents on the surface tension of water in order to better understand the impact they may have on organisms living on the sr+ vnpkc 6fb*5rzmb037a*l zlurface.

A paper clip was folded slightly on one side and rested on the surface of the water, maintained at a constant temperature and contained within a water tank. Drops of detergent solution were slowly added to the water tank until the paperclip sank to the bottom. The volume of detergent solution taken to sink the paperclip was recorded.

Detergent solutions were made by adding 5 ml of detergent to 15 ml of water.


1.Describe the relationship between the volume of detergent solution added and the surface tension of water.

2.1.For the Easy Clean detergent, calculate the mean number of drops of detergent needed to sink the paper clip.
Mean =  ml
2.2.Estimate how many drops of Easy Clean detergent solution it would take to sink 5 paper clips.

3.1.State one variable, other than those given, which would need to be controlled in this experiment in order to achieve a valid result.
3.2.Suggest one method that could be used to keep the water at a constant temperature.
3.3.Explain the importance of maintaining water at a constant temperature.
3.4.Identify one potential source of error in the methodology.
4.Suggest why different numbers of drops of detergent solution were needed to sink the paperclip between each type of detergent.

  Which of the following is not a real-life exaxtg;ls.r.i +5 ji:ngm j+ux,z mple of adhesion?

The image shows a cross-sect.o,mn )hio+f,z)(*tsf 9xurnu5rqsgc z ;x f-ion of the vascular tissue of a woody dicot stem, showing the annual rings of qrfntf 5zro+, (-ugsioc*;fnxx)zm , hs9 .u)phloem and xylem.


Explain how the properties of water allow it to be transported in the xylem.
Describe a physical property of water, other than those that are important for the movement of water through the plant, that makes water essential for the survival of plants.
Outline why plants cannot use water to transport lipids.
If the temperature drops to -1$^{\circ}$ for a few hours suggest a reason why the water in xylem may not freeze.

  The black-throated loon (Gavia arc3/zlsg f( u(6obk*)mdtxwnk2 u33k qytica) is a bird that lives near large bodies of water in cold 3kt( n kdmkoysfgqzl 23 xbuw6)/u(*3climates. Which of the following is a correct description of how the properties of water may make winter temperatures more moderate for the black-throated loon?

  Which of the following statemenb97a.;qenkxipdo d9u 615ieb t(s) about the role of water as a solvent is correct.b 16 neb5e;kpxii9daq 9od7u ?

I. Salt can dissolve in water because it is hydrophilic
II. Lipids cannot dissolve in water because they are non-polar
III. Cellulose can dissolve in water, as it is able to form hydrogen bonds

  The micrograph below shows the longitudinal cross-section of a stfayrlrpm/4 2a. r:7wxem from a plant in the Pinus genus. Xylem vessels are clearw a.rf:ylr7 ma2/x4p rly visible.


The xylem is composed of hollow, tube-like tissues that transport water through capillary action. What property of water explains capillary action?

The diagram shows a solar system very similar to ours, where fiveo3 or:6+lckhdx 9i zz8 planets orbit a zx oo9clr +6izdhk: 83central star.


1.Define the term “Goldilocks zone”.

2.1.Label with the letter R the planet that is least likely to have extraterrestrial life present.

2.2Explain reasons for your answer to part (i).

3.1.Some of the planets in this solar system have water present on them. Suggest where this water might have come from.

3.2.Explain why the planets referred to in part (i) have retained water, whereas others in this solar system have not.

4.Suggest one other biological molecule, other than water, that may be a sign of life on a planet.

  Which of the following statements explains how wr 6d-jvlg2-y7 po pb6kater has facilitated the evolution of gyd-676pjl- rbopkv2 life on Earth?