CHEMISTRY HIGH SCHOOL

What is the change in temperature in a 128g sample of water if it absorbs 2808J of heat energy at a temperature of 2°C?

Answers

Answer 1
Answer:

Given:

128g sample ofwater

2808J of heatenergy

Required:

Change intemperature

Solution:

This can be solvedthrough the equation H = mCpTwhere H is the heat, m is the mass, Cp is the specific heat and T is the change in temperature.

The specific heatof the water is 4.18 J/g-K

Plugging in thevalues into the equation

H = mCpT

2808J = (128g)(4.18 J/g-K) T

T= 5.25 K

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Which state of matter has a definite volume but can change its shape?A.) Solid
B.)gas
C.)liquid

Answers

Answer:

solid

Explanation:

because solid has a definite shape and volume

Answer:

Liquid

Explanation:

This is because the intermolecular forces of attraction are strong enough to hold the molecules together but not so strong as to fix them into definite positions (as in solids). Instead, they possess fluidity and hence no definite shape.

Normal rain has a pH of about 5.5 whereas the most acidic rain measured in Los Angeles had a pH of 1.5. How much more concentrated in H+ is the acid rain than the normal rain?

Answers

pH is used to measure the acidity of a substance and it can be used to calculate the amount of H+ ions in a solution. pH is expressed as:

pH = -log [H+]
For a normal rain:
5.5 = -log [H+]
[H+] = 1 x 10^-5 M

For an acid rain:
1.5 = -log [H+]
[H+] = 0.03 M

the answer is 5.6 !!

Determine the pressure exerted by 0.352 mol of oxygen gas in a 1.75 L container at room temperature (25 degrees Celsius). Show all your work!​

Answers

Answer:

P = 4.92 atm

Explanation:

Given data:

Number of mole of oxygen = 0.352 mol

Volume of gas = 1.75 L

Temperature = 25°C

Pressure exerted by gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

25+273 = 298 K

P × 1.75 L = 0.352 mol  × 0.0821 atm.L/ mol.K   ×298 K

P = 8.61 atm.L /  1.75 L

P = 4.92 atm

Please help!The following gases are at STP. Which one will diffuse the fastest? O2, H2, SO2, NO, NH3
O2
H2
NH3
NO
SO2

Answers

Hydrogen will defuse the fastest because it is the lightest

Where does the equilibrium point occur in a reaction system

Answers

The equilibrium point for a reaction is the point at which the rate of the forward reaction equals that of the reverse reaction.  At this point there will  not be a net change in the amount of products or reactants observed.

I hope this helps.  Let me know if anything is unclear.

Hi! could you help with this (Brainlist + 50 points)

Answers

1. 44 grams

2. KCIO3

3. the third one

hope this helps :)
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