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
oee [108]
3 years ago
5

What important result did Becquerel observe when he placed the uranium salt crystals and unexposed photographic film in a drawer

?
-The crystals phosphoresced within the drawer and exposed the film.
-The crystals did not phosphoresce within the drawer but did expose the film.
-The crystals phosphoresced within the drawer but did not expose the film.
-The crystals did not phosphoresce within the drawer and did not expose the film.
Chemistry
2 answers:
vovangra [49]3 years ago
7 0

The correct answer is "The crystals did not phosphoresce within the drawer but did expose the film."

Becquerel  is credited to have discovered radioactivity. Becquerel was studying the properties of x-ray using naturally fluorescent minerals. Uranium shows radioactive decay. It is the high energy invisible radiation from uranium that exposed the photographic film.

nexus9112 [7]3 years ago
4 0
<span>B) The crystals did not phosphoresce within the drawer but did expose the film</span>
You might be interested in
Why is salt water intrusion a big problem in florida?
Schach [20]

Its leading to contaminated drinking water.

7 0
3 years ago
Read 2 more answers
Arsenic produces a blue flame when heated. Calcium produces an orange-red flame. Which of these best explains why this differenc
MrMuchimi

Flame colors are produced from the movement of the electrons in the metal ions present in the compounds. When you heat it, the electrons gain energy and can jump into any of the empty orbitals at higher levels Each of these jumps involves a specific amount of energy being released as light energy, and each corresponds to a particular color. As a result of all these jumps, a spectrum of colored lines will be produced. The color you see will be a combination of all these individual colors.

6 0
3 years ago
Heat is transferred directly from a heat reservoir at 200 C to another heat reservoir at 5C. If the amount of heat transferred i
Daniel [21]

Answer:

ΔS=0.148  KJ/K

Explanation:

Given that

Q = 100 KJ

T₁=200°C

T₁=200+273 = 437 K

T₂=5°C

T₂=5 + 273 = 278 K

Reservoir 1 is rejecting heat that is why it taken as negative while the reservoir 2 is gaining the heat that is why it is taken as positive.

So the total change in entropy given as

ΔS=  - Q/T₁ + Q/T₂

ΔS=  - 100/473 + 100/278  KJ/K

ΔS=0.148  KJ/K

4 0
3 years ago
Calculate the number of ATP generated from one saturated 10 ‑carbon fatty acid. Assume that each NADH molecule generates 2.5 ATP
larisa86 [58]

Answer:

Total ATP molecules produced = 66 molecules of ATP

Explanation:

A 10-carbon fatty acid when it has undergone complete oxidation will yield 5 acetyl-CoA molecules and 4 FADH₂ and 4 NADH molecules each. Each of the 5 acetyl-CoA molecules enters into the citric acid cycle and is completely oxidized to yield further ATP and  FADH₂ and NADH molecules.

The total yield of ATP in the various enzymatic step is calculated below:

Acyl-CoA dehydrodenase = 4 FADH₂

β-Hydroxyacyl-CoA dehydrogenase = 4 NADH

Isocitrate dehydrogenase = 5 NADH

α-Ketoglutarate dehydrogenase = 5 NADH

Succinyl-CoA synthase = 5 ATP (from substrate-level phosphorylation of GDP)

Succinate dehydrogenase = 5 FADH₂

Malate dehydrogenase = 5 NADH

Total ATP  from FADH₂ molecoles = 9 * 1.5 = 13.5

Total NADH molecules = 19 * 2.5 = 47.5

Total ATP molecules produced = 13.5 + 47.5 + 5

Total ATP molecules produced = 66 molecules of ATP

6 0
3 years ago
What is the difference between physical and chemical properties? Give 3 examples of each.
IceJOKER [234]

Explanation:

1.A physical property is an aspect of matter that can be seen or measured without changing its chemical composition. Examples of physical properties include color, molecular weight, and volume.

A chemical property is observed only by changing the chemical identity of a substance. In other words, the only way to detect a chemical is to perform a chemical reaction.

2.This property measures the ability of chemical change. Examples of chemical properties are reactivity, flammability, and oxidation state.

The physical properties of a substance do not involve any chemical reaction. These include density, color, mass, hardness, freezing points, electrical properties, and the like.

Chemical properties include the reaction of chemicals with other substances. These reactions lead to the disappearance of the raw material and the appearance of new materials that have different physical and chemical properties.

3.Chemical properties can be compared to physical properties; On the contrary, they are recognizable without changing the structure of matter. However, for many properties in the field of physical chemistry and other disciplines at the boundary between chemistry and physics, the distinction can be a matter for the researcher's point of view. The properties of materials, both physical and chemical, can be seen as metaphysical; This means that it is secondary to the principle of tangible reality. Multiple metamorphic layers are also possible.

7 0
3 years ago
Other questions:
  • _____ waves are the p and s waves of an earthquake that shake the rocks beneath the surface as they travel along
    8·1 answer
  • Identify the component required for the electrolysis of molten nacl
    15·1 answer
  • What are the rows of the periodic table of the elements also called?
    14·2 answers
  • Help plz I will give brain
    12·1 answer
  • 20 POINTS!! please helps me with this word bank!! due today!! you can use a word more than once please help
    14·2 answers
  • Butane C4H10 (g),(Hf = –125.7), combusts in the presence of oxygen to form CO2 (g) (Delta.Hf = –393.5 kJ/mol), and H2O(g) (Delta
    6·1 answer
  • Na2SO4(aq) +CaCl2(aq) — CaSO4(s) + 2NaCl(aq) Ionic Equation: 2Na+ (aq) + S02-(aq) + Ca2+(aq) + 2C1- (aq) CaSO4(s) + 2Na+ (aq) +
    6·1 answer
  • How do you find the oxidation numbers for H3PO4
    5·1 answer
  • In many species, a transition metal has an unusually high or low oxidation state. Write balanced equations for the following and
    5·1 answer
  • consider this reaction at equilibrium at a total pressure: 2h2o(g) o2(g) 2h2o2(g) suppose the volume of this system is twice its
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!