Does earth core have more iron than earths crust?

What is the difference between Alkane and alkene.

Explain how the understanding of atomic emission spectrum led to development of the atomic theory

Living organisms all contain fats that are called ... protiens, lipids, carbohydrates, nucleic acids?

When you go down the food chain by asking the question "what does it eat" at what Category of living things do you always end up Subject: mystery science chapter: food chains

Fe + h2SO4>fe (SO4) 3+H2

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.

Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of the moon around the Earth The speed of the Earth around the sun The alignment of the planets

At which temperature would atoms of a He (g) sample have the greatest average kinetic energy? (1) 25°C (3) 273 K (2) 37°C (4) 298 K