How are elements usually found?

The dimmer star in a two-star system passes in front of the brighter star. Which phenomenon does this describe? -nebular cluster -global cluster -wobbling binary -eclipsing binary

What are some ways population size is limited within an ecosystem?

What strongly affects the movement of air masses along the earth's surface

If you held a syrup bottle upside down, it would take a long time for it to come all the way up. Explain why by using the words, viscosity, adhesion, and cohesion.

Consider the exothermic reaction 2C2H6 (g) + 7O2 (g) →4CO2 (g) + 6H2O (g) Calculate the standard heat of reaction, or ΔH∘rxn, for this reaction using the given data.

Tiffany leaves balloons filled with helium gas inside her car in on a sunny day when she returns to her car some some of the balloons are much larger and a few have popped explain what happened

If the pH indicator bromothymol blue was added to the nitric acid solution, it's colour would be?

Which statement describes a chemical reaction? Atoms in the products are rearranged to form new substances. Atoms in the reactants are rearranged to form new substances. Atoms in the products change into new atoms to form new substances.

The gases CO₂ (g) and NH₃ (g) can be liquefied at 20°C by compressing them to sufficiently high pressures. A student claims that NH₃ (g) can be liquefied at a lower pressure than CO₂ (g) can be liquefied.

Which is a pure substance A) mixture B) solution C) element