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
Sauron [17]
2 years ago
5

Question 4

Chemistry
1 answer:
ruslelena [56]2 years ago
7 0

Answer:

Physical change

Explanation:

Brainliest would be appreciated

You might be interested in
When silver coins are found in ancient shipwrecks, they are coated with a black crust. What question could you ask to help you d
Aleks04 [339]
You could ask whether the black crust is a new substance formed from silver underwent a chemical change because a chemical change produces a new substance.
5 0
2 years ago
In order to produce CO2, a student put a sample of calcium carbonate in a flask and added hydrochloric acid using the following
Lady_Fox [76]

Answer:

82.9% Is the percent yield

Explanation:

First, we need to balance the equation.

Ca(CO3) + 2HCl → H2O + CO2 + CaCl2

Since the problem tells you that the excess reactant is Ca(CO3), we just need to Stoichiometry to solve for the theoretical yield.

\frac{200g HCl}{1} x \frac{1 mole HCl}{36.46gHCl} x \frac{1 mol CO2}{2molHCl} x \frac{44.01CO2}{1molCO2} =120.707 g (theoretical yield)

Take your actual yield of 100g, divide that by 120.707, then multiply that decimical by 100.

4 0
3 years ago
What is the rate constant of a reaction if rate = 0.2 (mol/L)/s, [A] and [B] are each 3 M, m = 1, and n = 2?
tino4ka555 [31]
M= 1 and n = 2
( m+ n =  1 +2  = 3)

rate = K [A] [B]^2

0.2  = K *  3  * 3 ^2
0.2 =  K  *  3 * 9 
 K =    0.2   / 27 
K =   7.408 *  10 ^ -3  m^-2  s^-1

4 0
3 years ago
Read 2 more answers
What is always included in a comparative investigation?
Taya2010 [7]

Answer:

the answer is scientific question

Explanation:

6 0
2 years ago
Read 2 more answers
Julia wants to find out which color fabric will heat up the fastest when put under a direct light.
drek231 [11]
NO the answers wont be valid.
3 0
2 years ago
Read 2 more answers
Other questions:
  • A car driving east along the freeway at 60 m/s hits some traffic and after 7 seconds is
    9·1 answer
  • The secondary structure of a protein refers to the ___________.a. three-dimensional folded structure of the protein. b. configur
    6·1 answer
  • PLSSS help with this question ​
    10·2 answers
  • I need help with this so try to help me out please
    11·1 answer
  • How is water treated for human use​
    10·2 answers
  • After air enter the body through the nose or mouth it then goes to the <br> what?
    10·1 answer
  • How many moles of O2 are produced in the decomposition of 24 g of water in the
    11·1 answer
  • TRUE OR FALSE: Chromosomes are made up of proteins joined together like beads on a string.
    8·2 answers
  • When a species cannot respond to environmental changes, members of that species begin to die. When the last member of a species
    7·1 answer
  • What is the smallest whole-number coefficient for h₂s when the equation h₂s mno₄⁻ → mn²⁺ so₄²⁻ is balanced in acidic solution?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!