Question

(any 10)

1) Three sources of chemical energy?

2) What is ecosystem?

3) What is acid?

4) What is respiration?

5) What is veins?

6) What is galaxy?

7) What is bases?

8) Write any three chemical

9) What is dam?

3) planet

name?

10) What is blood circulation?

11) What is heartbeat?

12) What are the methods of classification of changes?​

Answer 1

Answer:

1. Examples of matter containing chemical energy include: Coal: Combustion reaction converts chemical energy into light and heat. Wood: Combustion reaction converts chemical energy into light and heat. Petroleum: Can be burned to release light and heat or changed into another form of chemical energy, such as gasoline.
2. An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. ... Ecosystems can be very large or very small.
3. in chemistry) a liquid substance that can dissolve metal and may burn your skin or clothes. Acids have a pH value of less than 7
4. a process by which living things produce energy from food. Respiration usually needs oxygen
5. Veins are vessels of the circulatory system that support circulation by conveying blood to the heart. Blood flowing through the circulatory system transports nutrients, oxygen, and water to cells throughout the body
6. A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity. We live on a planet called Earth that is part of our solar system. ... A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems.
7. A base is a substance that can neutralize the acid by reacting with hydrogen ions. Most bases are minerals that react with acids to form water and salts. Bases include the oxides, hydroxides and carbonates of metals. ... Bases have a slippery feel and taste bitter. Bases are defined as proton (H+) acceptors.
8. a wall built across a river to hold back the water and form a lake (reservoir) behind it

Answer 2

Answer:

1

Wood. Wood is an easily available source of chemical energy. ...

Coal. The most basic source of chemical energy is coal. ...

Gasoline. The gasoline that we use in cars is also a source of chemical energy. ...

2

An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. Biotic factors include plants, animals, and other organisms.

3

An acid is a molecule or ion capable of donating a proton, or, alternatively, capable of forming a covalent bond with an electron pair. The first category of acids are the proton donors, or Brønsted–Lowry acids

4

process by which living things produce energy from food. Respiration usually needs oxygen

5

Veins are a type of blood vessel that return deoxygenated blood from your organs back to your heart. These are different from your arteries, which deliver oxygenated blood from your heart to the rest of your body. Deoxygenated blood that flows into your veins is collected within tiny blood vessels called capillaries.

6

the system of stars that contains our sun and its planets, seen as a bright band in the night sky

7

In chemistry, there are three definitions in common use of the word base, known as Arrhenius bases, Brønsted bases and Lewis bases. All definitions agree that bases are substances which react with acids as originally proposed by G.-F. Rouelle in the mid-18th century.

8

ethyl

Boric acid

Trihydrooxidoboron

9

wall built across a river to hold back the water and form a lake (reservoir) behind it

10

The blood circulation is the physiological transport process of arterial and/or venous blood through the vascular system and the heart chambers. It is driven by the heart's pump function.