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3 years ago

Need help asap!!!(SCIENCE)

1 answer:

7 0

The correct answer is C because diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration.

HOPE THIS HELPS!
HAVE A GR8 DAY ;-)

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Analysis of a rock sample shows that it contains 6.25% of its original uranium-235. How old is the rock? How do you know?

nadya68 [22]

Answer:

$2.82\cdot 10^9 y$

Explanation:

A radioactive isotope is an isotope that undergoes nuclear decay, breaking apart into a smaller nucleus and emitting radiation during the process.

The half-life of an isotope is the amount of time it takes for a certain quantity of a radioactive isotope to halve.

For a radioactive isotope, the amount of substance left after a certain time t is:

$m(t)=m_0 (\frac{1}{2})^{\frac{t}{\tau}}$ (1)

where

$m_0$ is the mass of the substance at time t = 0

m(t) is the mass of the substance at time t

$\tau$ is the half-life of the isotope

In this problem, the isotope is uranium-235, which has a half-life of

$\tau=7.04\cdot 10^8 y$

We also know that the amount of uranium left in the rock sample is 6.25% of its original value, this means that

$\frac{m(t)}{m_0}=\frac{6.25}{100}$

Substituting into (1) and solving for t, we can find how much time has passed:

$t=-\tau log_2 (\frac{m(t)}{m_0})=-(7.04\cdot 10^8) log_2 (\frac{6.25}{100})=2.82\cdot 10^9 y$

5 0

4 years ago

When C2H4(g) reacts with H2O(g) to form CH3CH2OH(g) according to the following equation, energy is released into the surrounding

kirill [66]

Answer:

Exothermic

General Formulas and Concepts:

Chemistry

Thermodynamics

Exothermic - releases heat as a product
Endothermic - absorbs heat as a reactant

Explanation:

We are given that the reaction takes place between C₂H₄ (g) and H₂O (g) to form CH₃CH₂OH (g) and is releasing heat.

This means that heat would be product as it is being released during the reaction.

Therefore, we have an exothermic reaction.

3 0

3 years ago

Which arrow in the diagram represents the burning of fossil fuels? Choose 1 answer: Choose 1 answer: (Choice A) A arrow 1 (Choic

Alona [7]

Answer: arrow 4

Explanation:

7 0

3 years ago

Which element can only form one ion?

stich3 [128]

I think it's hydrogen. Hope this helps :)

5 0

3 years ago

Classify each of the following as an observation, a law, or a theory. (a) All matter is made of tiny, indestructible particles c

umka21 [38]

Explanation:

An observation is defined as the process which explains how it is happening (qualitative) and and quantitatively able to measure something about the process.

A law is defined as a verified statement that will remain true under the mentioned circumstances as it is based on the past observations that are carefully tested.

A theory is defined as the explanation of an aspect of natural world that can be tested, modified or rejected as a result of further experiments.

Hence, the given statements are classified as follows.

(a) All matter is made of tiny, indestructible particles called atoms - Theory

(b) When iron rusts in a closed container, the mass of the container and its contents does not change - Observation

(c) In chemical reactions, matter is neither created nor destroyed - Law

(d) When a match burns, heat is evolve - Observation

8 0

4 years ago