A student is designing a device that can be used for communication. Which TWO waves on the electromagnetic spectrum should the student use?

gamma rays

X-rays

ultraviolet waves

microwaves

radio waves

Why is concentrated sulphuric acid is weak acid

Which of the following best describe an atomic number? An element identity is defined by its atomic number this means it represents the number of

The process by which water changes from state to state on earth is called the

A reaction was set up to convert an alcohol to a carbonyl. Samples of the reaction mixture were checked by infrared spectrometry every couple of minutes.

Which unit is most commonly used for measuring pressure? a. m^3 b. bar c. N/m^3 d. Celsius

What are elements and how do they differ?

Write the structire of the salt that forms when diethylamine is mixed with hydrochloric acis

The heat of combustion of propane, C3H8, is 2220 kJ/mol. The specific heat of copper is 0.385 J/g°C. How many grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.

Which is an example of Temporal Isolation? A. Flowers that bloom in different months. B. Birds that have different mating calls C. Fruits flies that mate in different locations. D. Squirrels that have different fur colors

A chemical reaction can start when enough activation energy is added to the reactants. Do you think the activation energy for chemical reactions in living things is high or low / Explain your answer