What were most of the elements discovered when Mendeleev developed his original periodic table?

a. gases

b. radioactive

c. liquids

d. solids

Imagine that you have collided carts on an air-track to investigate conservation of momentum. Your results show that momentum after a collision is usually a little less than the momentum before.

Which stress management technique can reduce tension in your muscles? A. sleep B. exercise C. healthy eating D. manage your time

Compare and contrast the benefits of various physical activities

Which element is metalloid

What forces are acting apon a still soccer ball on a flat field

A scientist pours grape juice on three identical white shirts He then uses three different cleaning products on the shirts and measures how clean they get what is the independent variable in this experiment

What part of the atom does nuclear radiation come from?

Why should scientists write reports and give oral presentations of the steps and results of their in investigations?

Which of these rocks are formed by volcanic activity? select the two correct answers. a. marble b. basalt c. limestone d. granite e. sandstone

Which source is most likely an authority on the subject? Dr. Vale, a pediatrician, discusses electrical circuitry on her home-improvement website. Jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches.