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
asambeis [7]
3 years ago
15

Based on the results of this lab, write a short paragraph that summarizes how to distinguish physical changes from chemical chan

ges. Physical changes occur when the properties of a substance are retained and/or the materials can be recovered after the change. Chemical changes involve the formation of a new substance.
Chemistry
2 answers:
kolbaska11 [484]3 years ago
8 0

Answer:

g

Explanation:

gtyjtyj

qwelly [4]3 years ago
3 0

Answer:

what were the results

Explanation:

You might be interested in
Write the half-reactions as they occur at each electrode and the net cell reaction for this electrochemical cell containing tin
mojhsa [17]
  The  half  reactions    as  they  occur   at  each  electrode

is  as  follows

at  the  anode  Sn(s)  =sn^2+(aq)  +  2e  -
at  the  cathode  2  ag^+(aq)   + 2e -  =  2Ag (s)

net  cell  reaction  =   Sn (s)  +  2Ag^+(aq)  =  sn^2+ (aq) +  2  Ag  (s)
8 0
3 years ago
List the number of significant figures for the following numbers:
Dennis_Churaev [7]

Answer:

a) 2

b) 1

c( 1

d( 4

according to the picture

3 0
3 years ago
How does an increase in temperature affect the equilibrium concentration of the underlined substance and K for each of the follo
Darya [45]

Explanation:

Due to the positive value of the change in temperature, this is an endothermic reaction.

Since the forward reaction is endothermic, increasing the temperature increases the equilibrium constant (k).

In an equilibrium system, the position of the equilibrium will move in a way to annul the change made to the system. An increase in temperature for an endothermic reaction would favour the reaction, leading to increase in amount of products and decrease in amount of reactants.

3 0
3 years ago
A. Clearly draw the Lewis structure for the PBr4- ion. Show your math where
Nataliya [291]

Answer:

   Br

    |

Br-P-Br

    |

   Br

Explanation:

To calculate the valance electrons, look at the periodic table to find the valance electrons for each atom and add them together. P is in column 5A, so it has 5, Br is in column 7A, so it has 7 (multiply by 4 since there are 4 Br atoms to give 28) and there is a 1- charge, so add one more electron. 5+28+1=34, so there are 34 electrons to place. P would be the central atom, so place it in the middle. Place each Br around the P (as shown above) with a a single line connecting it. Each line represents 2 electrons, so 8 total have been place, leaving 26 remaining. Place 6 electrons around each Br (2 on each of the unbonded sides), which leaves 2 electrons remaining. The remaining pair of unbound electrons will be attached to the P between any two Br atoms. Phosphorus doesn't have to follow the octet rule, so it actually ends up with 10 valance electrons.

4 0
2 years ago
Read 2 more answers
How can one describe the bond between the two atoms of hydrogen to the one atom of oxygen within a molecule of water (h2o)?
Digiron [165]

There are O-H bonds in H2O. They have the intramolecular force of polar covalent bond.

4 0
3 years ago
Other questions:
  • How do particles tend to move in solids? Please explain your answer
    9·2 answers
  • Materials with air pockets that decrease their density and prevent energy transfer are called:
    5·1 answer
  • What isotope has 13 protons and 14 neutrons? Enter the name of the element followed by a hyphen and the mass number (e.g., urani
    9·1 answer
  • How many electrons does phosphorus have in its valence shell and neutrons in its nucleus, respectively?
    8·1 answer
  • Describe two situations in which you observed or performed an energy transformation. For each situation, name the starting form
    11·1 answer
  • HELP !!! urgent
    13·1 answer
  • Please hurry!!! And help!!
    15·2 answers
  • How many moles are in 3.0x10^24 molecules of water​
    5·2 answers
  • Describe the energy of the products in comparison to the energy the atoms had when the were wandering around the room free.
    6·1 answer
  • What type of reaction is <br> CH 4 (g)+2O 2 (g) CO 2 (g)+2H 2 O(g)
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!