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
-BARSIC- [3]
2 years ago
6

During an investigation, students dropped a tarnished penny into a solution of acetic acid and sodium chloride. Tiny bubbles for

med around the penny, and the penny was less tarnished after two minutes of soaking in the acetic acid and sodium chloride solution. The student inferred that a chemical reaction occurred.
What evidence supports the student’s inference?
The penny experienced a color change, and a gas was produced.
The penny experienced a color change, and a precipitate was formed.
The penny experienced a color change and is in a new state of matter.
The penny experienced a color change and produced light.
Chemistry
1 answer:
pogonyaev2 years ago
6 0
A. The penny experienced a color change, and a gas was produced.
The penny was less tarnished (color change), and tiny bubbles formed around the penny (due to a gas being produced).
You might be interested in
Write balanced molecular equation for the reaction between nitric acid and calcium hydroxide.
serg [7]
2HNO3 + Ca(OH)2 --> 2HOH + Ca(NO3)2

7 0
3 years ago
What is the splitting of the signal in the 1H NMR spectrum for the methyl protons of 1-bromo-2-methylpropane?
Arada [10]

Answer:

doublet

Explanation:

Proton MNR is used for the determination of no. of equivalents protons in a molecule

In the molecule, single NMR signal is produced for each set of protons.

Signal splitting is called spin-spin coupling and the splitting of signals depends upon the no. of neighboring proton.

The no. of signal for a proton is equal to n+1, where n is neighboring protons.

In 1-bromo-2-methylpropane, neighboring proton for both methyl protons are one. But the chemical environment of both the methyl protons are different.

Neighboring proton for methyl protons = 1

No. of signal for methyl protons = 1+1 =2

Hence, two doublets will be generated for each set of methyl protons. protons.

3 0
3 years ago
12
VARVARA [1.3K]

Answer:

B

Explanation:

the number of protons never changes even if the atomic mass changes

5 0
2 years ago
Cu20(s) + C(s) - 2Cu(s) + CO(g)
Romashka-Z-Leto [24]

Answer:

That means Cu2O is limiting reagent and C is excess reagent

Explanation:

Based on the reaction, 1 mole of Cu2O reacts per mole of C. The ratio of reaction is 1:1.

To solve this question we need to convert the mass of each reactant to moles. The reactant with the lower amount of moles is limiting reactant and the excess reactant is the reactant with the higher number of moles.

<em>Moles Cu2O -Molar mass: 143.09 g/mol-</em>

114.2g Cu2O * (1mol / 143.09g) = 0.798 moles Cu2O

<em>Moles C -Molar mass: 12.01g/mol-</em>

11.1g C * (1mol / 12.01g) = 0.924 moles C

<h3>That means Cu2O is limiting reagent and C is excess reagent</h3>

<em> </em>

<em />

6 0
2 years ago
A student in your class suggests that when most people watch exciting sporting events on television , their pulse rates increase
pashok25 [27]
DO STUFF!!! XD but really you would record there heartbeat per minute and record there normal rate and the rate watching sports!
5 0
3 years ago
Other questions:
  • A 44% wt/wt solution of H2SO4 has a density of 1.343g/ml. What mass of H2SO4 is 60ml of this solution?
    8·1 answer
  • Which example best represents an interaction of atmosphere and hydrosphere. A clouds form, b sunlight is reflected off the upper
    8·1 answer
  • Write the autoionization reaction for methanol, ch3oh.
    5·1 answer
  • If a nitrogen atom has a -3 net charge, how many electrons does it have?
    11·1 answer
  • When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any ti
    9·1 answer
  • The world's tallest artificial Christmas tree measured a mammoth 5.20 x 103 cm. How tall is the tree in kilometers?
    6·2 answers
  • Slkjflsdfjsfjlsm d dd dd dld dld dd;s dpd<br><br>.
    9·1 answer
  • A gas balloon has a volume of 106.0 liters when the temperature is 45.0 °C and the pressure is 740.0 mm of mercury. What will it
    7·1 answer
  • Which of these travels fastest in vacuum?
    9·2 answers
  • A 4-inch, f/5 telescope has a 1-inch eyepiece focal. Its magnifying power is:
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!