How many grams of ethylene (C2H4) are needed to produce 140 grams of carbor

dioxide?

All measurements have some degree of uncertainty. True False

As a chemical reaction occurs, the thermometer in the container records a decrease in temperature. What is true of the reaction?

1) Chemical analysis of a gaseous compound show its composition to be 36.4% carbon, 57.5% fluorine, and 6.1% hydrogen. A sample of 1.00 L of this gas has a mass of 2,96 g.

Why is a high tempertature needed to melt poptassium iodide

You are asked to smell a solution in a beaker. what is the best way of doing this?

The SI unit for current is: joules volts ohms amps

In chemical reactions, there is a conservation of what?

If the temperature of water increases as you heat it, the temperature is the independent variable. True False

Which is made by weathering? A. sediments B. minerals C. ash D. magma

Which Of These Is An Indication That A Chemical Reaction Has Occurred? A. Freezing Of A Substance B. Melting Of A Substance C. Boiling Of A Substance D. Formation Of A Gas