mrs. brown's science class is doing an experiment with sound waves. the class tested several different materials to see how quickly a sound wave would travel through each of the mediums. predict the order the materials were placed in if the class put them in order from slowest sound wave to fastest sound wave.

air, water, desk

air, desk, water

water, air desk

desk, water, air

Which position represents spring in the southern hemisphere? a) b) c) d)

Write the formula for the following chemicals. 7. e. trinitrogen tetraoxide a calcium phosphate f. magnesium acetate b. potassium sulfide g nickel(iii) cyanide c carbon dioxide h. silver sulfate d. cobalt(ii) chloride

Select the correct answer from each drop-down menu. describe what happens to a carbon-11 atom when it undergoes positron emission. the decay of a carbon-11 atom _1_, and this causes it to emit _2_.options for 1: > changes a neutron into a proton> changes a proton into a neutron> is hit with a neutron> reconfigures its protons and neutronsoptions for 2: > a negatively charged electron-sized particle> a positively charged election-sized particle> two atoms and several neutrons> two neutrons and two protons