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
Whitepunk [10]
3 years ago
5

PLEASE HELP!

Chemistry
2 answers:
Galina-37 [17]3 years ago
6 0
Answer:
A) A large nail rusting

Explanation:
A nail rusting is a chemical change because the iron has changed into a new substance. It is the iron (Fe) and oxygen (O) combining.

Chemical change:
When a chemical reaction occurs and a new substance is made.
E.g. Burning wood

Physical change:
When matter change form but not chemical identity.
E.g. Melting ice

Hope this helped you!
denis23 [38]3 years ago
5 0

Answer: A. a large nail rusting

Explanation:

You might be interested in
Consider a reaction that has a positive ΔH and a positive ΔS. Which of the following statements is TRUE?A) This reaction will be
Alja [10]

Answer: A) This reaction will be spontaneous only at high temperatures

Explanation:

\Delta G= +ve, reaction is non spontaneous

\Delta G= -ve, reaction is spontaneous

\Delta G= 0, reaction is in equilibrium

Using Gibbs Helmholtz equation:

\Delta G=\Delta H-T\Delta S

Given : \Delta H=+ve

\Delta S=+ve

\Delta G=(+ve)-T(+ve)

\Delta G=(+ve)(-ve)

Thus the value of  \Delta G  is negative and spontaneous when temperature is high.

4 0
3 years ago
Which type of radioactive decay occurs in the following reaction?
ella [17]
This one is beta decay (the -1 subscript tells us that)
7 0
4 years ago
Read 2 more answers
Select True or False: Pi bonds are covalent bonds in which the electron density is concentrated above and below a plane containi
anzhelika [568]

Answer:

True

Explanation:

In pi bonds, the electron density concentrates itself between the atoms of the compound but are present on either side of the line joining the atoms. Electron density is found above and below the plane of the line joining the internuclear axis of the two atoms involved in the bond.

Pi bonds usually occur by sideways overlap of atomic orbitals and this leads to both double and triple bonds.

3 0
3 years ago
What type of model did Rutherford, Thompson and Bohr develop?
motikmotik
The Bohr atomic model, relying on quantum mechanics, built upon the Rutherford model to explain the orbits of electrons.
4 0
3 years ago
QUICK! Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets?
Pani-rosa [81]

Answer:

B. The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.

Explanation:

Got it correct on edge

5 0
3 years ago
Other questions:
  • How many grams of Co are needed to react with an excess of fe203 to produce 156.2 g FE? show your work.
    11·1 answer
  • The main compound used to release energy for metabolism is ________.
    7·1 answer
  • Why is sodium chloride not a mixture?<br> Why is sodium chloride a compound?
    12·1 answer
  • What is the oxidation state of Fe(s)
    9·1 answer
  • 1. Circular movement around an axis​
    5·2 answers
  • 31 Which ion has the smallest radius?<br> (1) O2-(2) S2-(3) Se2-<br> (4) Te2-
    13·1 answer
  • A compound formed with potassium and bromine that can detect blood in a stain by reacting with it to form distinctive crystals
    6·1 answer
  • Which of the following are diatomic elements? Select all that apply.
    8·1 answer
  • During a chemical reaction, heat is absorbed. What kind of reaction occurred?
    10·2 answers
  • How many valence electrons does sr2+ have
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!