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3 years ago

Write the balanced NET IONIC equation for the reaction that occurs when hydrochloric acid and calcium hydroxide are combined.

Chemistry

1 answer:

Oduvanchick [21]3 years ago

5 0

Answer:

The reaction is classified as strong acid+ weak base

Explanation:

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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:

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

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4 years ago

What are some properties of sand paper

Otrada [13]

Rough, tan, grainy, and scratchy are some

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3 years ago

Explain how phosphorus can form a bond with 5 different chlorine atoms. In your answer, explain what

pav-90 [236]

Answer:

Phosphorus can have expanded octet, because it can shift it's lone pair electrons (3s orbital electrons) to empty 3d obital during excited state and thus can form 5 bonds.

Explanation:

hope it helps

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3 years ago

What will the presence of H+ ions in a solution cause?

leva [86]

H+ ions are proton charged ions that are present

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4 years ago

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Find the mass of a single one of the molecules or ionic compounds listed below. You must show your work in the correct format an

Lemur [1.5K]

I don’t really know tho

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3 years ago