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
vlada-n [284]
2 years ago
12

Research the compositions of Pennies. What was the composition of each of your Pennies prior to treatment

Chemistry
1 answer:
LenKa [72]2 years ago
7 0

Answer:

History of composition

Years Material Weight (grains)

1944–1946 gilding metal (95% copper, 5% zinc) 48 grains

1947–1962 bronze (95% copper, 5% tin and zinc) 48 grains

1962 – September 1982 gilding metal (95% copper, 5% zinc) 48 grains

October 1982 – present copper-plated zinc (97.5% zinc, 2.5% copper) 38.6 grains

You might be interested in
What is the composition of 'Clean dry air'<br><br> - Idk what subject its just science
Luba_88 [7]
Dry air is a mixture of nitrogen, oxygen, carbon dioxide etc.
air is a mixture of gases 78% nitrogen an 21% oxygen and other components.
7 0
3 years ago
Entropy change in an internally reversible isothermal process is _______ to the temperature of the system.
alukav5142 [94]

Answer:

Internally reversible is the answer.

Explanation:

3 0
3 years ago
The equation to calculate mean rate of reaction g/s
tatyana61 [14]

amount of product formed or amount of reactants used / time

8 0
3 years ago
Basic substances have a gritty texture.
crimeas [40]
<h3>1.<u> Answer;</u></h3>

False

<h3><u>Explanation;</u></h3>

Bases have some of the following properties;

  • They have a bitter taste
  • They have a slimy, or soapy feel on fingers
  • Most bases react with acids and precipitate salts.
  • Strong bases may react violently with acids.
  • Bases turn red litmus paper blue

<h3>2. <u>Answer;</u></h3>

An acid

<h3><u>Explanation;</u></h3>
  • When acids are dissolved in water, the concentration of the acid decreases and it becomes dilute.
  • It dissociates in water to give H+ ions or hydrogen ions.
  • All acidic solutions contain more hydrogen ions than hydroxide ions, therefore when added to water it increases the concentration of H+ ions in water, as water is a neutral substance whose concentration of H+ ions is equal to OH-.
5 0
3 years ago
What is the formula for photo synthesis
pshichka [43]

6CO2 + 6H20 + (energy) → C6H12O6 + 6O2

aka

Carbon dioxide+water+energy(from light)=glucose and oxygen

6 0
3 years ago
Read 2 more answers
Other questions:
  • consideras util conocer las propiedades extensivas e intensivas de los insumos utilizados para la elaboración de producto ¿por q
    14·1 answer
  • Describe how cells are organized into larger and larger groups to help living things survive
    15·1 answer
  • Given that the mass of an electron is 5.486×10−4amu, and the mass of a proton is 1.007 amu, calculate how many times heavier a p
    11·1 answer
  • Please help ill medal and fan!
    8·1 answer
  • PLZ HELP ASAP !!!!!!
    13·2 answers
  • On what is the geologic time scale based?
    8·2 answers
  • The complete combustion of acetylene, C2H2(g), produces 1300. kJ of energy per mole of acetylene consumed. How many grams of ace
    8·1 answer
  • Which of these observations is not an example of a physical property of matter? A. The density of sea water is measured to be 1.
    6·2 answers
  • What is the molarity of a solution that contains 50.0g of NaOH (molar mass = 40 grams/mole) in 2.0L of solution?
    9·2 answers
  • Calculate the number of different atoms in 0.2 mol ethene​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!