List the signs that indicate a chemical change has taken place. What does the presence or absence of these signs tell you about a chemical change?

In the Lewis dot structure for H2CCH2, how many bonds are between the carbon atoms? 3 4 1 2

A gas has a volume of 10.0 L at 250.0 K and has a pressure of 303.9 kPa, what must the temperature be when the volume changes to 30.0 L and the pressure changes to 101.3 kPa?

0.0200 L of 0.144 M HNO3 is required to neutralize a 0.0150 L sample of KOH exactly. How many moles of HNO3 reacted?

How would you describe the behavior of particles in a solid? A. They don't move very much and do not change position. B. They crash into each other and bounce all around. C. They move very quickly and across great distances. D.

Which is not the same as 5.63 grams

Given the equation 4Al + 3O2 - -> 2Al2O3 if 325 grams of Al2O3 are to be formed, determine the mass of aluminum that must be reacted with excess oxygen. Question 4 options: 101.77g Al 26.9g Al 171.80g Al 6.38g Al

Which statement describes the redox reaction that occurs when an object is electroplated? A. It is spontaneous and requires an electric current. B. It is spontaneous and produces an electric current. C.

How many grams are in 0.21mol sample of ethyl alcohol?

How is the evidence from a fire scene collected? What should be avoided?

What is covalent compound?