Which of the following is used to represent each element?

formula

equation

symbol

O

coefficient

Electrons have almost no mass. True False

Which best represents the law of conservation of mass? mass of reactants > mass of products mass of reactants < mass of products mass of reactants = mass of products mass of reactants → mass of products

Which of the following is a major concern of nuclear energy usage in the United States? A. not enough electricity can be produced B. the cost per energy unit is too high C. disposal of the waste products continues to be a problem

Which correctly defines a basic solution?

Many metals react with oxygen gas to form the metal oxide. for example, calcium reacts as follows. 2 ca (s) + o2 (g) → 2 cao (s) you wish to calculate the mass (g) of calcium oxide that can be prepared from 4.23 g of ca and 2.87 g of o2.

Only producers perform ... A) photosynthesis B) respiration C) both A & B D) neither A or B

A steel cylinder containing 25 kg of CCl2F2 in the form of liquid and vapor is set outdoors on a warm day 25 degrees celsius. What is the approximate pressure of the vapor in the cylinder?

Which of these observations would be classified as a physical property A:lemon juice cleans a penny B: A candle burns brightly C: baking soda in vinegar forms bubbles D: a cube of gold is hammered into a thin sheet

Target tissues of hormones are always near the glands that release the hormones. true or false

What four things affect the tides