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3 years ago

PLEASE HELP

2 answers:

7 0

The answer is A) Water has surface tension.
This is the correct answer because water allows animals and really light items to rest upon the top of the water.
Hope This Helps! If you could mark me as the brainiest answer, that would be amazing. I want others to read this answer and know it is accurate. If you need help with another question, just ask. :)

Iteru [2.4K]3 years ago

3 0

Answer: a) Water has surface tension

Explanation: Surface tension is the property of a liquid to acquire spherical shape due to a net downward force acting on the molecules present on the surface of the liquid.

Presence of strong hydrogen bonds between the molecules of water increases the forces of attraction and thus water membrane acts like a stretched membrane due to which they acquire a spherical shape.

b) Hydrogen and Oxygen form covalent bonds as they are joined by sharing of electrons.

c) Water is a versatile solvent due to its high dielectric constant.

d) The specific heat of water is quite high due to presence of hydrogen bonds.

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In the lab you find four bags; each contains 5.00 g of a different gas at STP. The gases are O2, CH4, CO2, and He. Which bag has

hichkok12 [17]

Answer:

lesser the molar mass of the gas higher the no. of moles included in a certain mass sample. ie at STP more volume is required for the gas having less molar mass.

He has the smallest molar mass.

Therefore bag of He is the biggest.

4 0

3 years ago

An aqueous solution of calcium hydroxide is standardized by titration with a 0.112 M solution of hydrobromic acid. If 15.2 mL of

TiliK225 [7]

Answer:

0.0457 M

Explanation:

The reaction that takes place is:

2HBr + Ca(OH)₂ → CaBr₂ + 2H₂O

First we calculate how many moles of acid reacted, using the HBr solution's concentration and volume:

Molarity = Moles / Volume

Molarity * Volume = Moles

0.112 M * 12.4 mL = 1.389 mmol HBr

Now we convert HBr moles to Ca(OH)₂ moles, using the stoichiometric ratio:

1.389 mmol HBr * $\frac{1mmolCa(OH)_{2}}{2mmolHBr}$ = 0.6944 mmol Ca(OH)₂

Finally we calculate the molarity of the Ca(OH)₂ solution, using the given volume and calculated moles:

0.6944 mmol Ca(OH)₂ / 15.2 mL = 0.0457 M

7 0

3 years ago

How is the jet stream Influencing the weather conditions depicted on the map?

Sauron [17]

Answer:

B. The jet stream is causing cold fronts to move from east to west

Explanation:

I hope this helped!

4 0

2 years ago

Tap water at room temperature has a pH of 7.2 and carbonate alkalinity of 200 mg/L (= 40 mmol/L). What is the concentration of b

UNO [17]

Answer:

the concentration of bicarbonate is [HCO₃⁻] = 0,03996 M and carbonate is [CO₃²⁻] = 3,56x10⁻⁵ M.

Explanation:

Carbonate-bicarbonate is:

HCO₃⁻ ⇄ CO₃²⁻ + H⁺ With pka = 10,25

Using Henderson-Hasselbalach formula:

pH = pka + log₁₀ $\frac{[CO_{3}^{2-}]}{[HCO_{3}^-]}$

7,2 = 10,25 + log₁₀ $\frac{[CO_{3}^{2-}]}{[HCO_{3}^-]}$

8,91x10⁻⁴ = $\frac{[CO_{3}^{2-}]}{[HCO_{3}^-]}$ (1)

Also:

0,040 M = [CO₃²⁻] + [HCO₃⁻] (2)

Replacing (2) in 1:

[HCO₃⁻] = 0,03996 M

Thus:

[CO₃²⁻] = 3,56x10⁻⁵ M

I hope it helps.

4 0

3 years ago

for 2Na (s) +Cl2(g)->2NaCl(s) how many grams of sodium chloride will be made from 115 g of sodium metal when when reacted wit

alexandr1967 [171]

The grams of sodium chloride that will be made is 292.5 g

calculation

2Na +Cl₂ → 2NaCl

step 1: calculate the moles of Na

moles = mass/molar mass

From periodic table the molar mass of Na = 23 g/mol

moles = 115 g/23 g /mol = 5 moles

Step 2 : use the mole ratio to determine the moles of NaCl

Na:NaCl is 2:2 = 1:1 therefore the moles of NaCl is also= 5 moles

Step 3: find the mass of NaCl

mass= moles x molar mass

The molar mass of NaCl = 23 + 35 .5 =58.5 g/mol

mass= 5 moles x 58.5 g/mol =292.5 g

5 0

3 years ago