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3 years ago

What causes a water strider to be able to walk on water?

Chemistry

2 answers:

Lena [83]3 years ago

8 0

Answer:

By repelling water, the tiny water striders stand on the water's surface and the captured airs allows them to float and move easily. so number 2. Surface Tension.

Explanation:

The attraction between water molecules creates tension and a very delicate membrane. Water striders walk on this membrane. ... The legs have tiny hairs that repel water and capture air.

Nina [5.8K]3 years ago

4 0

Answer:

Water striders use the high surface tension of water and long, hydrophobic legs to help them stay above water.

Hope this helps! (:

You might be interested in

Determine the final temperature of a system, if 120 grams had an initial temperature of 80°C and mixes with 3,000 g of water at

frutty [35]

Answer:

The final temperature of the mixture is 22.3°C

Explanation:

Assuming that the 120 g substance at 80°C is water, final temperature of the mixture can be determined using the formula:

Heat lost = Heat gained

Heat = mc∆T where m is mass, c is specific heat capacity of water, and ∆T is the temperature change = Tfinal - Tinitial.

Let the final temperature be T

Heat lost = 120 × c × (T - 80)

Heat gained = 3000 × c × ( T - 20)

Equating the heat lost and heat gained

120 × c × -(T - 80) = 3000 × c × (T - 20)

9600 - 120T = 3000T - 60000

60000 + 9600 = 3000T + 120T

69600 = 3120T

T = 69600/3120

T = 22.3°C

Therefore, the final temperature of the mixture is 22.3°C

4 0

3 years ago

I need help with this one

Oxana [17]

Answer:

Claim 1 is the correct answer.

8 0

2 years ago

Read 2 more answers

A chemist found a 60.00 gram sample containing copper and oxygen. Given the following percent composition, what is the mass of c

Strike441 [17]

The answer should 34.25g of Cu.

6 0

3 years ago

A certain liquid X has a normal freezing point of 7.60 °C and a freezing point depression constant K= 6.90 °C-kg-mol. Calculate

Dmitry [639]

Answer: The freezing point of solution is -5.11°C

Explanation:

Vant hoff factor for ionic solute is the number of ions that are present in a solution. The equation for the ionization of sodium chloride follows:

$NaCl(aq.)\rightarrow Na^{+}(aq.)+Cl^-(aq.)$

The total number of ions present in the solution are 2.

To calculate the molality of solution, we use the equation:

$Molality=\frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ in grams}}$

Where,

$m_{solute}$ = Given mass of solute (NaCl) = 7.57 g

$M_{solute}$ = Molar mass of solute (NaCl) = 58.44 g/mol

$W_{solvent}$ = Mass of solvent (liquid X) = 350.0 g

Putting values in above equation, we get:

$\text{Molality of }NaCl=\frac{7.57\times 1000}{58.44\times 350.0}\\\\\text{Molality of }NaCl=0.370m$

To calculate the depression in freezing point, we use the equation:

$\Delta T=iK_fm$

where,

i = Vant hoff factor = 2

$K_f$ = molal freezing point depression constant = 6.90°C/m

m = molality of solution = 0.370 m

Putting values in above equation, we get:

$\Delta T=2\times 6.90^oC/m.g\times 0.370m\\\\\Delta T=5.11^oC$

Depression in freezing point is defined as the difference in the freezing point of water and freezing point of solution.

$\Delta T=\text{freezing point of water}-\text{freezing point of solution}$

$\Delta T$ = 5.11 °C

Freezing point of water = 0°C

Freezing point of solution = ?

Putting values in above equation, we get:

$5.106^oC=0^oC-\text{Freezing point of solution}\\\\\text{Freezing point of solution}=-5.11^oC$

Hence, the freezing point of solution is -5.11°C

7 0

4 years ago

Which of the following procedures involves a physical change in one of the substances?

defon

Answer:

D. Separating a salt solution by evaporating the water

Explanation:

B. Allowing a nail to rust is a chemical change.

Becuase once the nail rust it turns into flakes and therefore is no longer a nail.

C. building a model rocket propelled by mixing baking soda and vinegar

By mixing baking soda (a powder) into vinegar ( a Acid) it causes a explosion...

the baking soda dissolve into the acid.... This a chemical reaction

A.creating salt by reacting sodium metal and chlorine gas

Sodium is salt but it says.... Sodium metal..... chlorine gas Changes color and it has a strong odor... chlorine gas with sodium metal turns it into salt.... it doesnt stay a metal or a gas it CHANGES.....

so therefore its a Chemical change

When A object or substance changes form or it causes a exsplosion or reaction it is a chemical change.

D. Separating a salt solution by evaporating the water

For a physical change your object may change color or shape but its still the same object.

salt in water ... The salt dont dissolve it just salty water.

So seperating salt by evaporating the water is a physical change.

5 0

3 years ago

Read 2 more answers