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4 years ago

Which is a biological effect of the hydrogen bonding between molecules of water

1 answer:

6 0

<span>Hydrogen bonding between water molecules is the foundation of multiple properties of water such as cohesion, adhesion, surface tension, water's high specific heat, three states, and low freezing point which all contribute to water sustaining life. The three states of water coupled with the low freezing point allows organisms living in aquatic systems in cold climates to be protected from the freezing air temperatures by the layer of ice that forms across the surface of lakes and rivers. The high specific heat of water allows it to be a wonderful cooling agent for people, the water molecules can absorb large quantities of heat before evaporating of our skin when we sweat carrying the heat away as well. The cohesion and adhesion properties of water allow the tips of the tallest trees in the Amazon and Sequoia National Park to still receive water.</span>

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Classify metals based on more reactive, moderate and less reactive

Alex17521 [72]

more reactive metals:

potassium (highest reactivity)

sodium

calcium

magnesium

moderate reactive metals:

aluminium

zinc

iron

lead

least reactive metals:

copper

mercury

silver

gold (least reactivity)

5 0

4 years ago

MAY SOMEONE HELP ME PLZZ

makkiz [27]

Answer: Rubber source, temperature, thinkness, thread design, driving pattenrs, weather, etc.

Explanation: There are many variables. Here are a few I would include in a tire lifetime study:

1. Type of rubber, including source

2. Thickness of tire

3. Design of tire thread

4. Life as a function of average speed and road surface

5. Expected outside temperature and wet conditions

6. Driving conditions of speed and both acceleration and deceleration parameters (e.g., tire life when slamming on the brakes or accelerating quickly)

5 0

3 years ago

The charge on the most stable ion of zinc

Natalija [7]

Zinc (Zn) always has a +2 charge. It is one of the exceptions.

8 0

3 years ago

You take three compounds consisting of two elements and decompose them. To determine the relative masses of X, Y, and Z, you col

miss Akunina [59]

Answer:

a) LAW OF MULTIPLE PROPORTIONS

b) 0.095g, 0.71g, 0.285g respectively

c) X2Y, YZ15, X6Y

d) hence mass of compound X = 21 x 0.045 = 0.95g

mass of compound Y = 21 x 0.955 = 20.05g

Explanation:

a) The assumptions made in solving this questions is the application of the LAW OF MULTIPLE PROPORTIONS. The Law of multiple proportions states that if two elements A and B combine together to form more than one compound, then the several masses of A which chemically combine with a fixed mass of B is in a simple ratio.

for example, copper forms two oxides ; copper(I) oxide (CuO) and copper(ii) oxide(Cu2O), it is possible for the two samples of the oxides to be reduced to Cu by reacting with Hydrogen gas. as such, certain masses of oxygen combine separately with a fixed mass of Cu. then the ratios of Cu are then determined.

b) To calculate the relative masses, we take note of the three compounds given, they all have some amount of Y in them, hence we can use Y as our relative mass, this implies that the relative mass of Y = 1g

mass of X = 0.4g

mass of Y = 4.2g

amount of X in 1g of Y = 0.4 x 1 /4.2

= 0.095g

for compound 2;

mass of Y = 1.4g

mass of Z = 1.0g

amount of Z in 1g of Y =1.0 x 1 /1.4

= 0.71g

for compound 3;

mass of X = 2.0g

mass of Y = 7.0g

amount of X in 1g of Y = 1 x 2/7

= 0.285g

c) Applying the law of multiple proportions; since elements X and Z combine with a fixed mass of Y, they must bear a simple ratio;

compound 1/compound 3 = 0.095/0.285

= 1/3

compound 1/compound 2 = 0.095/0.71

= 2/15

compound 2/ compound 3 = 0.71/0.285

= 5/2

formular for compound 1 = X2Y

formula for compound 2 = YZ15

formular for compound 3 = X6Y

d) from the formular X2Y, we can get the amount of each product in XY using the ratios

%of compound XY in X = mass of compound X / total Mass

= 0.2/4.4 = 4.5%

as such in a 21g of compound XY, %of compound Y = 1 - %of compound X = 95.5%

hence mass of compound X = 21 x 0.045 = 0.95g

mass of compound Y = 21 x 0.955 = 20.05g

5 0

3 years ago

What happens when an oceanic plate collides with a continental plate?

Fynjy0 [20]

What happens when an oceanic plate collides with a continental plate?

C. The oceanic plate moves under the continental plate

6 0

3 years ago