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
Nostrana [21]
4 years ago
12

Which of the following statements is true? Choose one: A. Bronze was used as early as 4000 B.C.E. to replace less-desirable iron

tools. B. Bronze is harder than copper, so it retains a cutting edge sharper than that of copper. C. Bronze is an alloy of copper and chromium. D. Copper is not easily smelted, because extremely high temperature is required.
Chemistry
1 answer:
Verizon [17]4 years ago
4 0

Answer:

B.Bronze is harder than copper, so it retains a cutting edge sharper than that of copper.

Explanation:

The importance of bronze in the history of the human kind can not be only measured in the durability but the help that it provided to our ancestors, the things they were allowed to do once they dicovered how to mold it, and the tools that they produced and made many every day tasks easier for them and the ability of bronze to mantain the cutting edge longer than copper was one of the main reasons why it took its places in the fabrication of many tools.

You might be interested in
58. A cylinder of a gas mixture used for calibration of blood gas analyzers in medical laboratories contains 5.0% CO2, 12.0% O2,
erica [24]

<em><u>Answer and Explanation:</u></em>

Greetings!

Let's~answer~your~question!

Partial ~pressure ~of ~gas ~can ~be ~directly~ calculated ~by ~multiplying ~the~ percentage\\ of~ pressure~ of~ gases~ to ~the ~total ~pressure.

\boxed{Pgas~ = ~P~total~ * \% ~P ~of ~gas}

<em><u>For % of N2 gas: </u></em>

<em><u /></em>100\% - (5\% + 12\%) = 83\% ~N2<em><u /></em>

<em><u /></em>

<em><u /></em>PN_2 ~= ~146~ atm~ *~ 0.83 ~ = 121.18 ~atm<em><u /></em>

<em><u /></em>PO_2 ~= ~146~ atm~ *~ 0.12~ = 17.52 ~atm<em><u /></em>

<em><u /></em>~PCO_2~ = ~146~ atm ~* 0.05 = 7.3 ~atm<em><u /></em>

3 0
4 years ago
6. What happens to the arrangement of water molecules as ice melts?
miv72 [106K]

Answer:

D. Molecules are able to move as they heat up to melt

Explanation:

3 0
3 years ago
Can someone help me out please ? I am very stuck here
Alex17521 [72]
Hey there!

<span>Atomic Masses :
</span>
H = <span>1.00794  a.m.u
N = </span><span>14.0067  a.m.u
O = </span><span>15.9994  a.m.u

Therefore:

HNO3 = </span>1.00794 + 14.0067 + ( 15.9994 * 3 ) =>  <span>63.0128 g/mol</span>
7 0
4 years ago
Lime is an alkaline substance which is sometimes put onto acidic soils.
VARVARA [1.3K]

Explanation:Your soil is acidic and you would like to change the pH so that it is less acidic. The universal advice is to add lime to the soil ie liming your soil. Lime is alkaline and it will neutralize the acidity of the soil and make it more neutral. Adding lime certainly works

5 0
3 years ago
Compare and Contrast primary and secondary carbon in terms of its bonding?
VLD [36.1K]

Answer:

the answer of this expression is that when i do that no yes but no then do yes that anyway the point that no yes is the answer of the

Explanation:

7 0
3 years ago
Other questions:
  • Which of the following states that an orbital can contain two electrons only if all other orbitals at that sublevel contain at l
    7·1 answer
  • Determine the number of bonding electrons and the number of nonbonding electrons in the structure of SI2. Enter the number of bo
    14·1 answer
  • At what temperature will water freeze if 100g NaCl are dissolved in 500g H2O?
    7·1 answer
  • A molecule with the formula ax3 uses __________ to form its bonds. multiple choice sp2 hybrid orbitals sp hybrid orbitals sp3d2
    13·2 answers
  • Which element in each of the following sets would you expect to have the lowest IE₃?
    12·2 answers
  • Which of the following people believed the atom to be indivisible?
    9·1 answer
  • What is the change in atomic number when an atom emits a beta particle?
    15·2 answers
  • The number of molecules in 1.0 mole of h2o is the same as in one mole of o2.
    9·1 answer
  • Why does atomic radii decrease as you move from the left to right across the period
    13·2 answers
  • How much heat is required to raise the temperature of 1,500 g of water from 25°C to 52°C? The specific heat of water is 4.184 J/
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!