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
dezoksy [38]
3 years ago
5

Carbon-14 is the typical radioisotope used to date materials; however it has limitation to 40000 years a scientist who wants to

date materials older than 40000 years would most likely use
A. Uranium- 238
B. Rubidium- 91
C. Iodine- 131
D. Cobalt- 60
Chemistry
1 answer:
ycow [4]3 years ago
6 0

Answer:

The answer would be Uranium-238

Explanation:

It's the only one that lasts longer than 40,000 years

You might be interested in
True or false 12,785.000 has five significant digits.
Yuki888 [10]

Answer:

True

Explanation:

Significant digits include non-zero digits (unless the zero is between two non-zero numbers)

In 12,785.000, there are 5 non-zero digits:

1 2 7 8 5

4 0
2 years ago
Read 2 more answers
The combustion of ethene in the presence of excess oxygen yields carbon dioxide and water: c2h4 (g) + 3o2 (g) → 2co2 (g) + 2h2o
meriva

Answer:

\boxed{-267.5}

Explanation:

You can calculate the entropy change of a reaction by using the standard molar entropies of reactants and products.

The formula is

\Delta_{r} S^{\circ} = \sum_n {nS_{\text{products}}^{\circ} - \sum_{m} {mS_{\text{reactants}}^{\circ}}}

The equation for the reaction is

                        C₂H₄(g) + 3O₂(g) ⟶ 2CO₂(g) + 2H₂O(ℓ)

ΔS°/J·K⁻¹mol⁻¹   219.5      205.0         213.6         69.9

\Delta_{r} S^{\circ} = (2\times213.6 + 2\times69.9) - (1\times219.5 + 3\times205.0)\\\\= 567.0 - 834.5 = \boxed{-267.5 \text{ J}\cdot\text{K}^{-1} \text{mol}^{-1}}

3 0
3 years ago
For the reaction below, initially the partial pressure of all 3 gases is 1.0atm. . 2NH3(g)--> N2(g) + 3H2(g) K, 0.83 1. When
erma4kov [3.2K]

Answer:

The reaction would shift toward the reactants

When the reaction reach equilibrium the partial pressure of NH3 will be greater than 1atm

Explanation:

For the reaction:

2NH₃(g) ⇄ N₂(g) + 3H₂(g)

Where K is defined as:

K = \frac{P_{N_{2}}*P_{H_2}^3}{P_{NH_3}^2} = 0.83

As initial pressures of all 3 gases is 1.0atm, reaction quotient, Q, is:

Q = \frac{1atm*{1atm}^3}{1atm^2} = 1

As Q > K, <em>the reaction will produce more NH₃ until Q = K consuming N₂ and H₂.</em>

Thus, there are true:

<h3>The reaction would shift toward the reactants</h3><h3>When the reaction reach equilibrium the partial pressure of NH3 will be greater than 1atm</h3>

<em />

4 0
3 years ago
Use these images to identify each state of matter.
rewona [7]

Answer:

Just too clarify its actually

A: gas

B: solid

C: liquid

4 0
3 years ago
HELP IT’S ABOUT TO BE DUE!
Vinil7 [7]
The answer is b
Explanation:
7 0
3 years ago
Other questions:
  • Finally, it is time to return to Earth and review how scientists here classify organisms:
    9·1 answer
  • An unknown metal has a density of 10.51 g/ml and a mass of 287.8 g. What is the
    12·2 answers
  • What kind of change is burning paper​
    10·2 answers
  • A galvanic cell is based on the following half-reactions at 279 K: Ag+ + e- → Ag Eo = 0.803 V H2O2 (aq) + 2 H+ + 2 e- → 2 H2O Eo
    14·1 answer
  • Iron Choose one: A. is alloyed with carbon and chromium to make stainless steel. B. was the first of the common metals (iron, al
    8·1 answer
  • Help!
    9·1 answer
  • What is the relationship between the electronic configuration, group and period numbers?
    10·1 answer
  • In diamond, each carbon atom is covalently bonded to four other carbons in a
    9·1 answer
  • Which of these is an example of chemical change
    12·1 answer
  • How are atoms connected to Electricity
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!