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
storchak [24]
3 years ago
9

Which changes are evidence of a chemical reaction? drag each item to the appropriate bin?

Chemistry
1 answer:
mr Goodwill [35]3 years ago
8 0
<span>Two clear solutions are mixed and form a cloudy solution, A beaker of water becomes hot to touch upon adding detergent powder to it, Bubble formation on chalk added to acid. These are the evidence of a chemical reaction.</span>
You might be interested in
if an unknown gas has one third the root mean squarevspeed of H2 at 300 K, what is the molar mass of the gas?​
Viefleur [7K]

The molar mass of the gas : 18 x 10⁻³ kg/mol

<h3>Further explanation</h3>

Given

An unknown gas has one third the root mean square speed of H2 at 300 K

Required

the molar mass of the gas

Solution

Average velocities of gases can be expressed as root-mean-square (V rms)  

\large {\boxed {\bold {v_ {rms} = \sqrt {\dfrac {3RT} {Mm}}}}

T = temperature, Mm = molar mass of the gas particles  , kg/mol

R = gas constant 8,314 J / mol K  

v rms An unknown gas = 1/3 v rms H₂

v rms H₂ :

\tt v_{rms}=\sqrt{\dfrac{3\times 8.314\times 300}{2.10^{-3}} }\\\\v_{rms}=1934.22

V rms of unknown gas =

\tt \dfrac{1}{3}\times 1934.22=644.74

\tt 644.74^2=\dfrac{3\times 8.314\times 300}{M_{gas}}\\\\M_{gas}=18\times 10^{-3}~kg/mol

7 0
3 years ago
Can someone help me pls
juin [17]
I know that computer engineering has a shortage of workers still
5 0
3 years ago
true or false, Discovering which of two materials can scratch the other is a way to compare the hardness of the materials
Shkiper50 [21]
True, the hardness of all materials in relative <span />
7 0
3 years ago
Read 2 more answers
How much heat has been lost when a 78 g piece of copper is placed into a calorimeter and cools from 120°C to
lora16 [44]

The amount of heat lost by the copper is 2402.4 J.

To Calculate the amount of heat lost, we use the formula below.

<h3>Formula:</h3>
  • Q = cm(t₂-t₁)................. Equation 1

<h3>Where:</h3>
  • Q = Amount of heat lost
  • c = specific heat capacity of copper
  • m = mass of copper
  • t₂ = Final temperature
  • t₁ = Initial temperature

From the question,

<h3>Given:</h3>
  • m = 78 g
  • c = 0.385 J/g°C
  • t₂ = 120°C
  • t₁ = 40°C

Substitute these values into equation 1.

  • Q = 78(0.385)(120-40)
  • Q = 2402.4 J

Hence, The heat lost by the copper is 2402.4 J

Learn more about heat here: brainly.com/question/13439286

3 0
2 years ago
Which two elements on the periodic table are in the same period?
emmainna [20.7K]

Answer:

Platinum and Gold ig.

6 0
3 years ago
Other questions:
  • Hydrogen is prepared commercially by the reaction of methane and water vapor at elevated temperatures. CH4 (g) + H2 O(g) ⇌ 3H2 (
    8·1 answer
  • some students believe that teachers are full of hot air. If I inhale 3.5 liters of gas at a temperature of 19 degrees Celsius an
    8·1 answer
  • HELP 30 Points !
    5·2 answers
  • Down syndrome is caused by the presence of an extra copy of chromosome 21. how would a karyotype identify a person with down syn
    10·1 answer
  • In most animals, combinations of various tissues make up<br> functional units<br> called
    14·1 answer
  • What gas has formed when bubels form when water is boiled?
    10·1 answer
  • The standard cell potential (e°) of a voltaic cell constructed using the cell reaction below is 0.76 v: zn (s) + 2h+ (aq) → zn2+
    6·1 answer
  • When a person ingests alcohol which organ metabolizes most of the absorbed alcohol
    15·1 answer
  • What is the definition of a radical​
    15·2 answers
  • 50 Two chemicals are mixed and sold in a plastic bag The bag begins to inflate and becomes hot to the touch. what evidence suppo
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!