CHEMISTRY HIGH SCHOOL

According to the work of the Curies, which action would increase the radioactivity of polonium?a. Dissolve the polonium in a solvent.
b. Heat the polonium until it becomes a gas.
c. Expose the polonium sample to light.
d. Increase the amount of polonium.

Answers

Answer 1

Answer:

Answer;

Increase the amount of Polonium

Explanation;

Pierre and Marie Curies are known for their work in the study of radioactivity that led to the discoveries of new radioactive elements radium and polonium. Polonium was named after Marie's home country, Poland.
Polonium is a rare natural element, it may be found in uranium ores which is uneconomical to extract. Therefore, it is obtained from the bombarding of bismuth-209 with neutron to get bismuth-210, which then undergoes radioactive decay to form Polonium.
According to Curies increasing the amount of polonium would increase the radioactivity of Polonium element. Polonium undergoes alpha decay to emit alpha particle and is therefore used as a source of alpha particles.

Answer 2

Answer: Of Course D) Increase the amount of Polonium.
You want "Increase" the Radioactivity, And since Polonium is himself radioactive, you need to increase its amount.

Hope this Helps :)

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Explain how the scientific definition of work is different from the everyday meaning

Answers

In every day life work is a job while in scientific terms the work is a change in energy due to applied force and displacement.

Work(Job) -

In every day life, work means an specific job that is assigned to people.

For example: I work as account assistant in the company.

Work:

In scientific terms the work is a product of applied force and displacement. It is measured in Joule.

For example- the engine did the 10 J of work.

Therefore, in every day life work is a job while in scientific terms the work is a change in energy due to applied force and displacement.

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EveryDay Work(Job) - A job is like something that someone or something does to get payed for doing thatspecific job they have

Ex: I work at Family Dollars it's my job(That's my everyday working job)

Work(Scientific Term) - Means when force acting on body to break it down in simpler terms, Lets say that you have a marker in your hand and you drop it you've just done work as as said before "Force acting on a body".

Enter the symbol of a sodium ion, Na+, followed by the formula of a sulfate ion, SO42−. Separate the ions with a comma only—spaces are not allowed. Express your answers as ions separated by a comma.

Answers

Sodium and sulfate are known to form the anion and cation by the gain and loss of electrons. Sodium forms a cation, Na⁺ and sulfate form anions, SO₄²⁻.

What are anions and cations?

Anions and cations are ions formed as charged entities formed by losing and gaining electrons from the valence shell. They completely transfer their electrons to form the ionic bond.

The cation is formed by the loss of electrons from a neutral atom when there are more electrons in the valence shell. Sodium form cations as,

Na (neutral atom) - e⁺ → Na⁺ (cation)

The anions are formed by gaining electrons from a neutral atom when there is less number of electrons in the valence shell. Sulfate form anions as,

SO₄ (neutral atom) + e⁻ → SO₄²⁻ (anion)

Therefore, ions are Na⁺, SO₄²⁻.

Learn more about cations and anions, here:

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#SPJ2

The respective symbols of sodium and sulphate ions are $\boxed{{\text{N}}{{\text{a}}^ + },{\text{ SO}}_4^(2 - )}$ .

Further explanation:

The species that are produced after loss or gain of electrons are known as ions. Since ions are charged entities, these can be either positively charged or negatively charged. The positively charged ions are formed by the loss of electrons from the neutral atom and are known as cations. The negatively charged ions are called anions and are formed by the gain of electrons to the neutral atom.

The formation of anion occurs as follows:

${\text{A}}\left( {{\text{Neutral atom}}} \right) + {e^ - } \to {{\text{A}}^ - }\left( {{\text{Anion}}} \right)$

The formation of cation occurs as follows:

${\text{C}}\left( {{\text{Neutral atom}}} \right) - {e^ - } \to {{\text{C}}^ + }\left( {{\text{Cation}}} \right)$

The atomic number of Na is 11 so it has a configuration of $1{s^2}2{s^2}2{p^6}3{s^1}$ . It easily loses its 3s electron to form ${\text{N}}{{\text{a}}^ + }$ whose configuration becomes $1{s^2}2{s^2}2{p^6}$ . These ions are beneficial for heart activity, regulation of blood and body fluids and in transmission of nerve impulses. The formation of ${\text{N}}{{\text{a}}^ + }$ occurs as follows:

${\text{Na}}\left( {1{s^2}2{s^2}2{p^6}3{s^1}} \right) - {e^ - } \to {\text{N}}{{\text{a}}^ + }\left( {1{s^2}2{s^2}2{p^6}} \right)$

${\text{SO}}_4^(2 - )$ is a polyatomic ion that involves a central sulphur atom surrounded by four oxygen atoms and has a charge of -2 on it. These ions are used as cleansing agents in soaps and shampoos.

Learn more:

Balanced chemical equation: brainly.com/question/1405182
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Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic compounds

Keywords: ions, cations, anions, loss, gain, electrons, Na, Na+, A, C, A-, C+, atomic number, configuration, formation.

In the same science fair,Tina ask the question "does caffeine increase the heart rate of an earthworm?" In test 1,she measures the heart rate by looking at the earthworm under a microscopes, the heart rate if 50 beats per minute. In test 2,she places a few drops of caffeine on the earthworms skin and measures the rate again.in this test the heart rate is 68beats per minuteWhat is the independent variable in this experiment
What is the dependent variable in this experiment
Tina's experiment should have included a hypothisis .in a complete sentence,suggest a hypothesis for Tina's experiment

Answers

The independent variable is the one that does not change depending on other variables - so here it would be the presence or the absence of caffeine - this is dependent on Tina's actions, but not on other variables in the experiment. The dependent variable is the heart rate - it is assumed to depend on the presence or absence of caffeine. A hypothesis could be that "Caffeine causes an increase of heart rate in earthworms" - and this hypothesis is what the experiment is testing.

Which element is likely to be the most brittle

Answers

Answer : Selenium

Explanation :

The complete question is attached in the attachment.

Out of the given options, Selenium is the one which is most brittle element.

As selenium is a metalloid or a crystalline non metal which is lustrous and is ductile in nature and is highly brittle in nature.

Selenium is the most brittle out of all the other elements

A stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge? A. 313.6 meters B. 78.4 meters C. 1,254.4 meters D. 39.2 meters

Answers

The correct answer is letter A. We use the formula, v=vo + at to get the answer.

v=vo + at
v=0 + (9.8)(8)
v=78.4

y=1/2(vo + v)t
y=1/2(78.4)(8)
y=1/2(627.2)
y=313.6m

The answer will be A 313.6

Which period is older than the Triassic period? Cambrian Cretaceous Jurassic Paleogene.

Answers

The Triassic period is one of the geological periods and is the shortest of the Mesozoic era. Cambrian is the older era than the Triassic period.

What is Cambrian and triassic period?

The Triassic period existed 250 -200 million years ago and started after the vastest and most extreme devastation ever. It is the 1st period of the Mesozoic and is known for the movement of the Dinosaurs on the land, flying pterosaurs and swimming plesiosaurs and ichthyosaurs.

The Cambrian is the period of the Paleozoic era and is the most important period because of the appearance of many animals. In this period, the temperature raised on the planet and the ice sheets melted at a very dangerous rate leading to mass devastation.

Therefore, option A.Cambrian is older than the Triassic period.

Learn more about Cambrian and Triassic periods here:

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Answer:

A: Cambrian!

Explanation:

got it right on ed :)

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