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3 years ago

Outline the two main observations that led Wegener to propose the theory of continental drift.

Chemistry

1 answer:

ArbitrLikvidat [17]3 years ago

8 0

Answer:

for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zone

Explanation:

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Colin is writing a story in which a spy damages a fusion nuclear reactor, the reaction runs out of control, and the reactor expl

Tresset [83]

The phenomenon that releases uncontrolled amounts of energy very fast is fission, and that is what is used in bombs.
The last option is correct.

4 0

3 years ago

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A 0.630 gram sample of a metal, M, reacts completely with sulfuric acid according to:A volume of 291 mL of hydrogen is collected

Lina20 [59]

Answer:

55.0 g/mol

Step-by-step explanation:

Step 1. Partial pressure of hydrogen

You are collecting the gas over water, so

$p_{\text{atm}} = p_{\text{H}_{2}} + p_{\text{H}_{2}\text{O}}$

$p_{\text{H}_{2}} = p_{\text{atm}} - p_{\text{H}_{2}\text{O}}$

$p_{\text{atm}} = \text{756.0 Torr}$

At 25 °C, $p_{\text{H}_{2}\text{O}} = \text{23.8 Torr}$

$p_{\text{H}_{2}} = \text{756.0 Torr} - \text{23.8 Torr} = \text{732.2 Torr}$

===============

Step 2. Moles of H₂

We can use the Ideal Gas Law.

pV = nRT Divide both sides by RT

n = (pV)/(RT)

p = 732.2 Torr Convert to atmospheres

p = 732.2/760

p = 0.9634 atm

V = 291 mL Convert to litres

V = 0.291 L

R = 0.082 06 L·atm·K⁻¹mol⁻¹

T = 25 °C Convert to kelvins

T = (25 + 273.15 ) K = 298.15 K

n = (0.9632 × 0.291)/(0.082 06 × 298.15)

n = 0.2804/24.47

n = 0.011 46 mol

===============

Step 3. Moles of metal

The partial chemical equation is

M + H₂SO₄ ⟶ H₂ + …

The molar ratio of M:H₂ is 1 mol M:1 mol H₂.

Moles of M = 0.011 46× 1/1

Moles of M = 0.011 46 mol M

===============

Step 4. Atomic mass of M

Atomic mass = mass of M/moles of M

Atomic mass = 0.630/0.011 46

Atomic mass = 55.0 g/mol

7 0

4 years ago

Complete the sentence. The atomic number of an element is found by counting the number of _______ in an atom. A. isotopes B. ele

Kipish [7]

D.) Protons............

8 0

3 years ago

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Select the correct answer. What is the number of protons in this carbon atom? A. 12 B. 6 C. 18 D. 24

andrew11 [14]

Answer:

The correct answer is

C. 6 Protons

Explanation:

Carbon is a nonmetallic element that is available in both organic and inorganic compounds.

Carbon belongs to group 14 elements in the periodic table,carbon is a chemical element with the symbol C and atomic number 6, it can form long chains with its own atoms, a feature called catenation.

Two allotropes of carbon available are diamonds and graphites, which have different crystalline structures

The physical properties of carbon vary widely with the allotropic form.

examples are.

Graphite, diamonds and coal are all nearly pure forms of carbon
Diamond is highly transparent. Graphite is opaque and black
Diamond is one of the hardest substances known to man. Graphite is soft and often used as the "lead" in lead pencils
Diamond has a very low electrical conductivity. Graphite is a very good conductor
Very brittle, and cannot be rolled into wires or pounded into sheets

8 0

3 years ago

A voltaic cell is based on the following two half-reactions: ni 2(aq) 2e− → ni(s) e° = −0. 25 v cr 3(aq) 3e– → cr(s) e° = –0. 74

emmasim [6.3K]

The net cell reaction is given as 3 Ni²⁺ (aq) + 2 Cr (s) = 2 Cr³⁺ (aq) + 3 Ni (s), and the cell potential is 0.49 V.

<h3>What is a half-cell reaction?</h3>

A half cell reaction is given as the oxidation or the reduction reaction that takes place at each of the anode or the cathode, forming the net redox reaction.

The cell potential and the half-reactions are:

Ni²⁺ + 2e⁻ = Ni (s) E° = -0.25 V

Cr³⁺ + 3e⁻ = Cr (s) E° = -0.74 V

The anodic reaction is given as:

Cr (s) = Cr³⁺ + 3e⁻ E° = 0.74 V

The cathodic reaction is given as:

Ni²⁺ + 2e⁻ = Ni (s) E° = -0.25 V

Thus, the net reaction of the cell will be:

3 Ni²⁺ (aq) + 2 Cr (s) = 2 Cr³⁺ (aq) + 3 Ni (s)

The cell potential can be calculated as:

E° = E (cathode) + E (anode)

E° = 0.74 + (-0.25) V

E° = 0.49 V

Thus, the net cell reaction is given as 3 Ni²⁺ (aq) + 2 Cr (s) = 2 Cr³⁺ (aq) + 3 Ni (s), and the cell potential is 0.49 V.

Learn more about cell potential, here:

brainly.com/question/1313684

#SPJ4

3 0

2 years ago