1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lunna [17]
3 years ago
8

Science problem please help

Chemistry
2 answers:
masha68 [24]3 years ago
8 0
The answer to your question number 5 is b
-Dominant- [34]3 years ago
5 0
Question 5 would be c, and b

You might be interested in
A particular sample of air is 2.5% water vapor express the concentration of water vapor in parts per million
Inessa05 [86]

Answer:

                     25000 ppm

Explanation:

<em>Parts Per Million </em>is defined as the number of parts of a solute per one million parts of a solution.

                  ppm  =  (Weight of Solute / Weight of Solution) × 10⁶   ---(1)

Let us suppose that the air (solution) weights 100 grams, then 2.5 % of water vapors will have following mass,

Mass of Vapors g / 100 g × 100  =  2.5

Or,

Mass of Vapors = 2.5 × 100 / 100

Mass of Vapors  =  2.5 g

Hence, mass of water vapors is 2.5 g.

Now, putting mass of water vapors and air in eq. 1,

                  ppm  =  (2.5 / 100) × 10⁶

                 ppm  =  25000

7 0
3 years ago
Part A. Two containers, one at 305 K and the other at 295 K, are placed in contact with each other. 1. 1 J of heat flows from th
posledela

Answer:

0.00011 JK.

The process does NOT violate the second law of thermodynamics

Explanation:

The following parameters are given which are going to help in solving for the change in entropy of the system. The term "entropy'' simply means the degree of disorderliness of a system.

=> The temperature of container A = 305 K, the temperature of container B = 295 K and the amount of heat generated when the containers are placed in contact with each other = 1. 1 J.

The change in entropy of the hot container = -(1/305) = - 0.00328 J/K.

The change in entropy of the cold container = 1/295 = 0.00339 J/K.

Therefore, the change in the entropy of the system = - 0.00328 J/K + 0.00339 J/K = 0.00011 JK.

Note that the change in entropy of the system gives a positive value. Hence, this process does not violate the second law of thermodynamics.

The process does NOT violate the second law of thermodynamics.

7 0
3 years ago
HELP!
MAVERICK [17]

Answer:

C

Explanation:

energy cannot be created or destroyed like solar energy for instance. it is already energy because it comes from the sun and for other reason.

Hope this helps!

4 0
3 years ago
Is mixing baking soda and vegetable oil a chemical change or physical change and WHY? PLEASE HELP
skelet666 [1.2K]
It’s a chemical change
3 0
2 years ago
Read 2 more answers
Draw a schematic of the hydrogen atom with the single proton in the nucleus, and the n=1, n=2, n=3, and n=4 energy level options
max2010maxim [7]

Explanation:

According to Bohr's postulates, the electron in the present in the lower energy level can absorb energy and exits to higher energy level. Also, when this electron returns back to its orbit, it emits some energy.

Since the hydrogen consists of 1 electron and 1 proton. The lowest energy configuration of the hydrogen is when n =1 or, when the electron is present in the K-shell or the ground state.

The possible transition for the electron given in the question is :

n = 2, 3 and 4

The schematic diagram of the hydrogen atom consisting of these four quantum levels in which the electron can jump (Absorption) and comeback to from these energy levels (emission) .

3 0
3 years ago
Other questions:
  • Reactant X contains 199.3 J of chemical energy. Reactant Y contains 272.3 J of chemical energy. Product W contains 41.9 J of che
    14·2 answers
  • The equation for the reaction between copper and nitric acid is
    5·2 answers
  • What is the volume of .04 mol of a gas at .9 kPa and 20 degrees celsius
    11·1 answer
  • What is the most important role that water plays for living organisms
    12·2 answers
  • How many lithium ions are required to bond with one nitrogen ion? Why?
    12·1 answer
  • Which of the species would be expected to be the most miscible in benzene (c6h6)? 1. decane, c10h22 2. hydrogen fluoride, hf 3.
    9·2 answers
  • HELP ASAP SCIENCE PIC IS BELLOW HURRY (pls) i will mark you brainliest and will give you 17 points
    14·1 answer
  • A balloon with a volume of 0.5L at 293K is cooled to 20K. What is the balloon's new<br> volume?
    7·1 answer
  • Answer the following question:
    8·2 answers
  • Timmyabc19, this is us.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!