Submarines sometimes make a "pinging" sound to determine the depth of an object in the ocean. This process is called

A. sonar.

B. radar.

C. refraction.

D. diffraction

A volume of 75.0 mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water. If the final temperature of the system is 21.

How can I find the answer for this?

Is water an element, molecule, or compound?

how much energy is required to heat 40.0 grams of water from 25°C to 75°C? The specific heat capacity of water is 4.184 J/g.

A graduate student working toward a PhD in Chemistry discovers an efficient, powerful redox reaction involving an uncommon combination of chemicals.

When a chemical reaction takes place, the number of atoms of each element in the reactants

A scientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon dioxide, oxygen, and nitrogen. Which term most likely describes what she is measuring?

How would you expect energy to change during a chemical reaction? A. Energy will be increased. B. Energy will be decreased. C. Energy will be converted into another form. D. Energy will be consumed.

In the formula for the compound xcl4 the x could represent

What is the main function of antibodies? A: "Remembering" the characteristics of germs that have invaded your body in the past B: Creating new white blood cells C: binding themselves to invading antigens D:Signaling your immune system that antigens