What are some signs that a chemical change takes place when a firework explodes? Matter is destroyed Light is produced Heat is produced The chemical composition is not changed

How has the scientific community addressed the safety of chemicals?

Draw a venn diagram and fill in the characteristics of the states of matter

A phase is a part of a system with what type of composition? gaseous liquid different uniform

The organisms living together in a community are interdependent upon one another. Look at the food web below. In which of the following ways is a puffin dependent upon salmon? A. Puffins have a commensalistic relationship with salmon. B.

2. Which of the following is unique for any given element? A its mass number B the number of its neutrons C its atomic number

If a 860. ml of linseed oil has a mass of 680 g, what is the density of the oil

Without any force to change it, an object at rest stays at rest and an object in motion stays in motion. This demonstrates which of Newton's Laws? Question 3 options: (A) Newton's First Law (B) Newton's Second Law (C) Newton's Third Law

You are examining the DNA sequences that code for the enzyme phosphofructokinase in skinks and Komodo dragons.

Scientists are often interested in knowing the molar heat of combustion the heat released during the combustion of one molar of a substance use a periodic table to find molar masses. How many moles of ethanol are present in the sample? ? Mol

Which of the following is not a source of air pollution related to human activities