Some physical evidence was obtained from a crime scene. For which of these pieces of evidence will forensic scientists conduct an identification test?

A.

a hair strand

B.

a black powder

C.

a glove

D.

bloodstains

A chemical reaction can theoretically produce 137.5 grams of product, but in actuality 112.9 grams are produced. Which is the percent yield for this reaction? a. 82.11% c. 24.60% b. 62.08% d. 17.91%

In this experiment, you will change the temperature and particle size of the antacid tablet and observe how these changes affect reaction. In the space below, write a scientific question that you answered by doing this experiment

How many particles are present in 4.50g of CaCO3

Which molecule would you predict would be more stable: be2 - 2 or be2?

Tungsten carbide is becoming popular for making jewelry. a chemist is examining a sample of tungsten carbide (chemical formula WC). what is the percent composition of tungsten in this compound? round your answer to the nearest whole percent.

Four moles of hydrogen chloride (HCl) gas react with one mole of oxygen (O2) gas to produce two moles of chlorine gas (Cl2) and two moles of water gas (H2O).

what noble gas electron configuration is achieved by the bromine atoms in a molecule of BR2, a diatomic element?

What are facts on osmosis?

If a map of temperature displayed stripes parallel to the equator with equal temperatures at equivalent distances north and south of the equator, it would mean that only blank affected temperature.

What is the term for the amount of salts in water? Evaporation Evaporation Salinity Thermocline Density