The solid form of a substance is usually more dense than its liquid and gaseous forms. Similarly the liquid form is usually more dense than the gaseous form. Which of these breaks this general density rule?
A. ice floating in a glass of water
B. vapor rising from a hot cup of tea
C. cooled magma sinking in a lava flow
D. a hot air balloon falling as the gas inside cools

Answers

Answer 1

Answer: A is the answer.

Ice is solid, however, water is liquid. Yet ice still floats which is less dense than water.

Hope this helps!

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A 115.0-g sample of oxygen was produced by heating 400.0 g of potassium chlorate.2KClO3 Right arrow. 2KCI + 3O2What is the percent yield of oxygen in this chemical reaction?Use Percent yield equals StartFraction actual yield over theoretical yield EndFraction times 100..
Pleaseeeeeeeeeeeeee please helpYou have learned that the atomic number of a chemical is the number of protons found in the nucleus. Atomic numbers can be used to find the number of neutrons and electrons in an atom. In this project, you will practice atomic mass and atomic mass number calculation as well as fill out a chart using the periodic table. Don’t forget to read through the rubric below, so you will know what you will be graded on. When you are ready, upload it replacing the “Lastname” in the saved document name with your last name. Part I: The atomic number of the sodium atom is 11. The atomic mass number can be estimated by rounding the atomic mass to 23. From this information, you can find the number of neutrons: 11 protons plus how many neutrons equals a mass number of 23? The number of neutrons would have to be the difference between 23 and 11, which is 12. This fact can be restated this way: 11 protons plus 12 neutrons equals a mass number of 23. For every proton in the nucleus, an electron revolves around the nucleus. Since 11 protons are in sodium, 11 electrons must be in sodium. Using this information and the Periodic Table from lesson titled Periodic Table fill in the chart below. Element Atomic Number Atomic Mass How many neutrons? How many electrons? How many protons? Sodium 11 23 12 11 11 Chlorine Carbon Lead Iron Magnesium Uranium Cobalt Calcium Platinum Phosphorus
Please help me with this question number 22

Physical activity and exercise typically lead to __________.a. increased stress
b. depression
c. higher energy levels
d. reduced quality of life

Answers

The answer is c - physical activity and exercise typically lead to higher energy levels. The endorphins and hormones released during periods of high activity actually help to combat stress and depression linked to a depletion in serotonin, and therefore can only increase the quality of life. The other possible answers to this question are therefore all incorrect.

the answer is c i just took the test

A sample of matter must be copper if(1) each atom in the sample has 29 protons(2) atoms in the sample react with oxygen
(3) the sample melts at 1768 K
(4) the sample can conduct electricity

Answers

The answer is 1. Copper is an element with sign Cu and atomic number 29 which means that there are 29 protons in this element. It is a soft, flexible, and elastic metal with very extraordinary thermal and electrical conductivity. A newly unprotected exterior of pure copper has a reddish-orange color.

Final answer:

Copper samples must have 29 protons, react with oxygen, melt at 1768 K, and conduct electricity.

Explanation:

In order for a sample of matter to be copper, it must meet certain criteria:

Each atom in the sample must have 29 protons. Copper has an atomic number of 29, which means it has 29 protons in its nucleus.
The atoms in the sample must react with oxygen. Copper undergoes a chemical reaction with oxygen to form copper oxide.
The sample must melt at 1768 K. Copper has a melting point of 1768 K, which is significantly higher than room temperature.
The sample must be able to conduct electricity. Copper is a good conductor of electricity due to its free electrons.

Therefore, if a sample of matter meets all of these criteria, it can be identified as copper.

Learn more about Copper here:

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What is the number of proton in chlorine?

Answers

Answer:

Atomic Number of Chlorine. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure.

Explanation:

The number of protons in chlorine is 17.

Why is it preferable to use Am in smoke detector?Low stable and highly reactive
High stability over long time and source need not be replaced
High penetration and high ionization
A good source of beta radiation and has a half-life of 432 years

Answers

Answer:

Ionization smoke detectors use americium as a source of alpha particles. Alpha particles from the americium source ionize air molecules. This makes some particles positively charged and some negatively charged. ... Because of this shielding, the smoke detector poses no radiation health risk when they are properly handled.

Explanation:

Hope this helped! :D

Commercial fertilizers, which are made by humans, are used to enrich soil for healthier crops. However, erosion may carry the fertilizer chemicals to the oceans. The presence of these chemicals may cause certain kinds of algae to reproduce rapidly. This decreases the amount of oxygen in the water, which can cause organisms that depend on it, like fish, to die.Which statements describe the impact of the use of fertilizers? Select two options.

It improves the growth of crops.
It provides more food for fish.
It causes erosion and washes away soil.
It causes the death of crops.
It harms organisms that live in the oceans.

Answers

The statements that describe the impact of the use of fertilizers are as follows:

It harms organisms that live in the oceans
improves the growth of crops

What is the effect of eutrophication?

Eutrophication is the process that involves the addition of artificial or natural nutrients, mainly phosphates, through detergents, fertilizers, or sewage, to an aquatic system.

According to this question, commercial fertilizers, which are made by humans, are used to enrich soil for healthier crops. However, erosion may carry the fertilizer chemicals to the oceans which leads to eutrophication.

This eutrophication may cause certain kinds of algae to reproduce rapidly, hence, having the following impacts:

It harms organisms that live in the oceans due to reduced oxygen content.
improves the growth of crops due to excessive nutrients

Learn more about eutrophication at: brainly.com/question/13232104

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Answer: 1 and 5

Explanation:

Just took it

A typical neon light contains neon gas mixed with argon gas. If the total pressure of the mixture is 1.63 atm and the partial pressure of the neon is 0.71
atm. What is the partial pressure (atm) of argon?

Answers

the partial pressure of argon is:

1.63-0.71= 0.92 atm

1.63 atm - 0.71 atm = 0.92 atm

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