State one use of alkali metals

In an atomic model that includes a nucleus, positive charge is a. located in the space outside the nucleus. b. spread evenly throughout an atom. c. concentrated at multiple sites in an atom. d. concentrated in the center of an atom.

Electrolysis uses electrical current to break water molecules into oxygen gas and hydrogen gas. How do you know that this is a chemical change?

A characteristic of matter that doesn't change even with a very small or very large simple size

Which of the following does not lead to an increase in phytoplankton reproduction? a. increased nutrient availability b. increased sunlight c. increased oxygen levels d. increased levels of carbon dioxide

Which is most likely an inorganic compound

What the different betwen observe and reference

How many moles are in 12.5 g of H2O

How do the atomic number and the number of protons relate to one another? The atomic number tells us the number of protons The atomic number is protons + neutrons They do not Electron Cloud

Check my work? 150 g of an unknown liquid is heated with 24,975 kJ of heat to form 0°C to 75°C. Identify the unknown liquid. Substance C (J/g-°C) Water (ice) 2.05 Ammonia (liquid) 4.70 Ethanol 2.44 Gasoline 2.22 Water (liquid) 4.18 Water (vapour) 2.

The distance from the sun to the earth is 1.496x10^8 km. How long does it take light to travel from the sun to the earth