Sounds travels most rapidly in solid objects, especially those that are dense. These objects have closely packed atoms, and energy that is traveling in vibrations (the sound) can easily pass between the touching atoms.
Answer: Summary of Common Properties
- High ionization energies.
- High electronegativities.
- Poor thermal conductors.
- Poor electrical conductors.
- Brittle solids—not malleable or ductile.
- Little or no metallic luster.
- Gain electrons easily.
- Dull, not metallic-shiny, although they may be colorful.
Explanation:
<u><em>May I please have brainiest?</em></u>
Marisa Miller, supermodel and surfer
Actively promotes an ocean-friendly lifestyle: one that eliminates single-use plastic water bottles, and incorporates sustainable seafood choices, as well as products that keep pollutants out of the ocean. Actively works with the Surf Rider Foundation. Marisa Miller is an activist who cares about clean oceans.
James Cameron, Director of Terminator, Titanic and Avatar
Supports ocean conservation and played a key part in getting president Obama to create the world’s largest ocean sanctuary.
Miguel Bosé, singer
Collaborates with Oceana and has participated in the initiative Pristine Seas by National Geographic. He is one of the main Spanish activist celebrities in favor of the oceans and clean oceans and has been key in promoting ocean conservation projects in Ecuador, Colombia and Costa Rica.
Top 10 celebrities that care about the oceans
Adrian Grenier, actor and director
Passionate ocean advocate reducing his use of single use plastics and appeal for everyone to commit to “conscious consumption” through changing personal habits.
Pierce Brosnan, actor
Who can save our oceans if not James Bond? Played a key part in the documentary “Oceans” and activist in saving our oceans and marine life.
Jack Johnson, singer
He contributes in numerous NGOs and initiatives for the planet, including 1% For The Planet, Climate Counts, Heal the Ocean, Live Earth, Waterkeeper Alliance and others. He has recently filmed The Smog of the Sea, a short film that documents a week-long expedition to explore the problem of plastic pollution in the ocean.
Almudena Fernández, model and eco-activist
She has worked with Greenpeace’s campaign to stop the pollution of the seabed and she is Al Gore’s spokeswoman in Spain. She cares about clean oceans.
Top 10 celebrities that care about the oceans
Leonardo DiCaprio, actor
His foundation plays a key role in ocean conservation and informing the public (most recently with the award winning film Before the Flood) about how we can save the world.
Richard Branson, businessman
He is a well-known celebrity in the fight against carbon emissions and keeping the sea levels low, having committed more than $3bn over the next ten years to help combat global warming. Together with James Cameron, he has also started the initiative Ocean Elders to protect, value, and celebrate the ocean and its wildlife.
Jason Mraz, musician
He is active in many ocean conservation projects from organizations such as the Surfrider Foundation and the Natural Resources Defense Council. He was also interviewed for Sea Voices, a book to unite and inspire people around the world for the health of the ocean.
Answer:
The change in enthalpy in the combustion of 3 moles of methane = -2406 kJ
Explanation:
<u>Step 1: </u>The balanced equation
CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g) ΔH = -802 kJ
<u>Step 2:</u> Given data
We notice that for 1 mole of methane (CH4), we need 2 moles of O2 to produce : 1 mole of CO2 and 2 moles of H20.
The enthalpy change of combustion, given here as Δ
H
, tells us how much heat is either absorbed or released by the combustion of <u>one mole</u> of a substance.
In this case: we notice that the combustion of 1 mole of methane gives off (because of the negative number), 802.3 kJ of heat.
<u>Step 3: </u>calculate the enthalpy change for 3 moles
The -802 kj is the enthalpy change for 1 mole
The change in enthalpy for 3 moles = 3* -802 kJ = -2406 kJ
The change in enthalpy in the combustion of 3 moles of methane = -2406 kJ
