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NISA [10]
3 years ago
11

What is a substance formed when two or more elements combine and lose their distinct properties

Chemistry
1 answer:
Alisiya [41]3 years ago
5 0
The answer is compound. This a substance shaped when chemical elements (two or more) are chemically joined together. The kind of bonds holding elements in a compound can differ: there are two common kinds namely covalent bonds and ionic bonds. The elements in at all compound are continuously existing in fixed ratios.
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Practice Problem: True Stress and Strain A cylindrical specimen of a metal alloy 49.7 mm long and 9.72 mm in diameter is stresse
amm1812

Answer:

The true stress required = 379 MPa

Explanation:

True Stress is the ratio of the internal resistive force to the instantaneous cross-sectional area of the specimen. True Strain is the natural log to the extended length after which load applied to the original length. The cold working stress – strain curve relation is as follows,

σ(t) = K (ε(t))ⁿ, σ(t) is the true stress, ε(t) is the true strain, K is the strength coefficient and n is the strain hardening exponent

True strain is given  by

Epsilon t =㏑ (l/l₀)

Substitute㏑(l/l₀) for ε(t)

σ(t) = K(㏑(l/l₀))ⁿ

Given values l₀ = 49.7mm, l =51.7mm , n =0.2 , σ(t) =379Mpa

379 x 10⁶ = K (㏑(51.7/49.7))^0.2

K = 379 x 10⁶/(㏑(51.7/49.7))^0.2

K = 723.48 MPa

Knowing the constant value would be same as the same material is being used in the second test, we can find out the true stress using the above formula replacing the value of the constant.

σ(t) = K(㏑(l/l₀))ⁿ

l₀ = 49.7mm, l = 51.7mm, n = 0.2, K = 723.48Mpa

σ(t) = 723.48 x 106 x (㏑(51.7/49.7))^0.2

σ(t) = 379 MPa

The true stress necessary to plastically elongate the specimen is 379 MPa.

6 0
3 years ago
Read 2 more answers
A. Match each type of titration to its pH at the equivalence point.
maks197457 [2]

Answer:answers are in the explanation

Explanation:

(a). pH less than 7 between 1 - 3.5 are strong acid, and between 4.5-6.9 weak acid.

pH greater than 7; between 10-14 is a strong base, and between 7.1 - 9, it is weakly basic.

(b). Equation of reaction;

HBr + KOH ---------> KBr + H2O

One mole of HBr reacts with one mole of KOH to give one Mole of KBr and one mole of H2O

Calculating the mmol, we have;

mmol KOH = 28.0 ml × 0.50 M

mmol KOH= 14 mmol

mmol of HBr= 56 ml × 0.25M

mmol of HBr= 14 mmol

Both HBr and KOH are used up in the reaction, which leaves only the product,KBr and H2O.

The pH here is greater than 7

(C). [NH4^+] = 0.20 mol L^-1 × 50 ml. L^-1 ÷ 50 mL + 50mL

= 0.10 M

Ka=Kw/kb

10^-14/ 1.8× 10^-5

Ka= 5.56 ×10^-10

Therefore, ka= x^2 / 0.20

5.56e-10 = x^2/0.20

x= (0.20 × 5.56e-10)^2

x= 1.05 × 10^-5

pH = -log [H+]

pH= - log[1.05 × 10^-5]

pH = 4.98

Acidic(less than 7)

(c). 0.5 × 20/40

= 0.25 M

Ka= Kw/kb

kb= 10^-14/1.8× 10^-5

Kb = 5.56×10^-10

x= (5.56×10^-10 × 0.5)^2

x= 1.667×10^-5 M

pH will be basic

3 0
3 years ago
A sample of oxygen occupies a volume of 100 mL at a temperature of
Vesna [10]
The answer is 546K. If you need the answer in degrees Celsius you subtract 273 from 546 and get 273 degrees Celsius. I included how I got the answer in the photo below. Hope this helps!
4 0
4 years ago
If 12% of x is equal to 6% of y, then 18% of x will be equal to how much percent of y?
ipn [44]
18 percent of x will be equal to 12 percent of y 
7 0
3 years ago
Convert each of the following lengths to the units requested.
d1i1m1o1n [39]

Answer:The Battle of Bunker Hill in was considered a victory for the Continental army because

the Americans maintained their control of Bunker Hill.

the British army sustained heavy casualties.

the Americans forced British soldiers to retreat to Boston.

the British army was forced to use most of its ammunition.

Explanation:The Battle of Bunker Hill in 1775 was considered a victory for the Continental army because

the Americans maintained their control of Bunker Hill.

the British army sustained heavy casualties.

the Americans forced British soldiers to retreat to Boston.

the British army was forced to use most of its ammunition.The Battle of Bunker Hill in 1775 was considered a victory for the Continental army because

the Americans maintained their control of Bunker Hill.

the British army sustained heavy casualties.

the Americans forced British soldiers to retreat to Boston.

the British army was forced to use most of its ammunition.The Battle of Bunker Hill in 1775 was considered a victory for the Continental army because

the Americans maintained their control of Bunker Hill.

the British army sustained heavy casualties.

the Americans forced British soldiers to retreat to Boston.

the British army was forced to use most of its ammunition.The Battle of Bunker Hill in 1775 was considered a victory for the Continental army because

the Americans maintained their control of Bunker Hill.

the British army sustained heavy casualties.

the Americans forced British soldiers to retreat to Boston.

the British army was forced to use most of its ammunition.The Battle of Bunker Hill in 1775 was considered a victory for the Continental army because

the Americans maintained their control of Bunker Hill.

the British army sustained heavy casualties.

the Americans forced British soldiers to retreat to Boston.

the British army was forced to use most of its ammunition.

4 0
4 years ago
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