The heat exchange in chemical reactions is due to a change in:

-kinetic energy

-enthalpy

-temperature

-physical properties

Which one of the following is a characteristic of a metal? A. Becomes negative when combined with other elements. B. Changes the color of litmus paper to red. C. Conducts heat readily. D. Reacts with bases to produce salts.

Suppose you have a car traveling down the road at constant speed and not changing direction. It is experiencing gravity, wind resistance and frictional forces from the road. What can be said about the car's acceleration?

Kaylie is describing the physical properties of an orange and a lemon. which two physical properties can she determine without using any measurement instruments

Select all of the answers that apply. Why do some people argue that the Cenozoic era should not be called the "Age of Mammals"? There are no mammals present during this era. Flowering plants are just as common during this era.

In the simple act of lighting a match, chemical energy stored in the match is transformed into heat and light. What is true about this energy transformation? Question 4 options: Most of the energy is lost when the match is struck.

Which planet, when viewed through a telescope, appears as a reddish ball interrupted by some permanent dark regions that change intensity?

A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed? a. 50 mm/s b. 50 hertz's c. 2 mms d. 0 0.50 mms

Suppose you illuminate two thin slits by monochromatic coherent light in air and find that they produce their first interference minima at / pm 35.09 degrees on either side of the central bright spot.

Tala wants to create a sound echo. She can create the echo using a pane of glass or a carpet square. Which one does she choose? Explain.

a the average distance from the Sun to Pluto is approximately 6.10 x 1 0 ^9. how long does it take light from the sun to reach Pluto?