Rain that has a very low pH is called

How many moles of copper Atoms are in 4 moles of Cu3(po4)2

Galina-37 [17]

12 moles, there is 3 moles of copper in one mole of Cu3 (PO4)2, there four multiple 3 by 4 and you get 12

6 0

3 years ago

Ira is working in a lab with a unknown solution. when he inserts the electrical conductivity tester in the in known, the bulb be

valentina_108 [34]

Ira is working in a lab with a unknown solution. when he inserts the electrical conductivity tester in the in known, the bulb begins to glow brightly. which of these would best describe the unknown liquid ?

A) It contains polar molecules that conduct electricity.

B) The water that the solid is dissolved in conducts electricity.

C) It contains a ionic compound that conducts electricity in solution.

D) It contains a covalent compound that conducts electricity in solution.

ANSWER:

C) It contains a ionic compound that conducts electricity in solution.

for usatestprep YW

3 0

3 years ago

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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

What is an example of making an inference to support comprehension? In three to five sentences, explain your answer. 20 points

Elena-2011 [213]

Answer:

For example, a student looking at the picture of the baby could state the obvious by saying the baby is crying. ... When students predict, they guess what will happen next based on what they already know from the text and their background knowledge. When students infer, they make a guess about what is currently happening.

Explanation:

Hope that helps

Have I good day

Can I have brain pls

8 0

3 years ago

Match these people to the discoveries or work that they are known for. Galileo developed geocentric theory Aristotle developed h

vfiekz [6]

Answer:

Galileo: "Father of Modern Science."

Aristotle: Geocentric theory." (The planests revolves around the earth.)

Torricelli: Invented the barometer. (An instrument which measures pressure.)

Copernicus: Heliocentric theory. (Aka, the planets revolves around the sun.)

Vesalius: Examined the inner workings of the human body

Newton: Developed law of universal gravitation.

Nightingale: Founded nursing profession.

Celsius: Developed metric temperature scale

I hope this helps! Thanks:)

7 0

3 years ago