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Komok [63]
3 years ago
12

chemical properties a. include changes of state of a substance b. include mass and color c. include changes that alter the ident

ity of a substance d. can be observed without altering the identity of a substance
Chemistry
1 answer:
8_murik_8 [283]3 years ago
6 0
C. Include changes that alter the identity of a substance. 
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What is the energy of a single photon of blue light with a wavelength of 488 nm (488 × 10-9 m)?
Vinvika [58]
E = hf

c = speed of electromagnetic wave, c ≈ 3 * 10⁸ m/s, 
Planck's constant h = 6.63 *10⁻³⁴ Js

h = Planck's constnat,  Frquency, f = c/λ = (3*10⁸)/(488*10⁻⁹)

E = hf

E = hc/λ

E = (6.63 * 10⁻³⁴ * 3 * 10⁸) /(488 * 10⁻⁹)

Energy, E ≈ 4.0758 * 10⁻¹⁹  Joules.
3 0
3 years ago
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A gas has a pressure of 3 atm at 350°C. What will its pressure be at 250°C? The volume and amount of gas is constant. Hint: Conv
vichka [17]

<u>We are given:</u>

P1 = 3 atm                  T1 = 623 K <em>(350 + 273)</em>

P2 = x atm                 T2 = 523 K <em>(250 + 273)</em>

<em />

<u>Solving for x:</u>

From the idea gas equation:

PV = nRT

since number of moles (n) , Volume (V) and the Universal Gas constant(R) are constants;

P / T = k   (where k is a constant)

the value of  k will be the same for a gas with variable pressure and temperature and constant moles and volume

Hence, we can say that:

P1 / T1 = P2 / T2

3 / 623 = x / 523

x = 523 * 3 / 623

x = 2.5 atm (approx)

Therefore, the final pressure is 2.5 atm

7 0
3 years ago
Which chemical is oxidized?<br><br> A) Mg<br> B) O2<br> C) MgO
kow [346]

C) MgO aka magnesium oxide

5 0
3 years ago
Sugar is...
Leya [2.2K]

Answer:

B. a type of carbohydrate

Explanation:

Sugar is a type of carbohydrate.

Hope it helped brainiest plz

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3 years ago
What is a picture of homologous pairs of chromosomes and sex chromosomes?
Alecsey [184]

Answer:

allene?

Explanation:

5 0
3 years ago
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