Gustaf observes a chemical reaction between two substances in a glass beaker. While observing the reaction, he touches the beake
r and notices that it feels warm. Why does the beaker feel warm?
a. The beaker absorbed energy that was released by the chemical reaction.
b. The beaker released energy that was absorbed by Gustaf's hand.
c. The beaker absorbed energy that was released from Gustaf's hand.
d. The beaker released energy that was absorbed by the chemical reaction.
a. The beaker absorbed energy that was released by the chemical reaction.
Explanation:
Gustaf was watching an exothermic reaction, so the beaker got hot.
Exothermic reaction is one in which there is release of energy. In this process, energy production persists only through continuous supply of energy.
Gustaf was watching an exothermic reaction between two substances in a glass beaker. This reaction occurs with the release of energy because it is an exothermic reaction. In this way, the glass absorbed energy that was released by the chemical reaction.
The Earth's surface is constantly changing through forces in nature. The daily processes of precipitation, wind and land movement result in changes to landforms over a long period of time. Driving forces include erosion, volcanoes and earthquakes. People also contribute to changes in the appearance of land.
Astronauts use "Astronomical Unit" to measure the distance between planets in our solar system "only". To measure long distances like between 2 galaxies, they use "light years". One Astronomical Unit = Average distance between sun and earth which is equal to 149.6 million kilometers. Ping me if you have any doubt.
