CHEMISTRY MIDDLE SCHOOL

5)
» A change in
means that a chemical reaction has occurred.

Answers

Answer 1
Answer:

Answer:

C)  the properties and identity of the reacting substances

Explanation:

took the test
Answer 2
Answer:

Answer:

.....

Explanation:

Chemical changes occur when bonds between atoms are broken and new bonds form. As a result, new substances are produced. There are four signs that a chemical reaction has occurred: a change in color, a change in temperature, formation of a gas or formation of a precipitate.

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Zebra mussels have no???

Answers

good question ask your parents :3 hope this helps

How do some deep-water bacteria in the ocean make food?

Answers

Answer:

They make food by using chemosynthesis.

Explanation:

Final answer:

Deep-water bacteria, known as chemoautotrophs, make their own food through a process called chemosynthesis, using chemicals like hydrogen sulfide from hydrothermal vents instead of sunlight.

Explanation:

Some deep-water bacteria in the ocean are known as chemoautotrophs, which can produce their own food by using chemical energy from hydrothermal vents. Unlike plants, they do not use sunlight for photosynthesis. Instead, they rely on chemosynthesis for their energy supply. In this process, bacteria convert chemicals from the vents into usable energy or food. For example, some bacteria use hydrogen sulfide, a chemical abundant in the deep ocean, for chemosynthesis. This biological process allows these deep-water bacteria to thrive in environments where sunlight is not available.

Learn more about Chemosynthesis here:

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Is popping popcorn a physical or chemical change? Explain your answers.

Answers

it would be a physical change because if you were to pop popcorn the popcorn would go from a kernel to a popcorn peice therfore the physical state is alterered/changed\.

1. what type of ion is chlorine ?2. what type of ion is oxygen?
3. what type of ion is
magnesium?
4. what type of ion is silicone?
5. what type of ion is carbonate?
6. what type of ion is nitrate?​

Answers

Answer:

1. Univalent negative ion (Cl-)

2. Divalent negative ion (O2-)

3. Divalent positive ion (Mg2+)

4. Divalent negative ion (S2-)

5. Divalent negative ion (CO3)^2-

6. Univalent negative ion (NO3) ^-
1 . It is formed when the element chlorine (a halogen) gains an electron or when a compound such as hydrogen chloride is dissolved in water or other polar solvents.

What is a magnet? Explain what it is please.

Answers

A magnet is a material usually composed of iron, ore or another metallic alloy that has its component atoms so ordered that the material exhibits properties of magnetism, such as attracting other metal alloy objects or aligning itself in an external magnetic field.

What is the difference between conduction and convection?

Answers

These are both ways heat travel. Conduction is when something is touching something i.e. When you touch a hot pan. Convection is heat rising, then cooling so it sinks and heats back up and rises again repetitively i.e. A convection oven (think circulation of heat)
CONVECTION is the transfer of heat from high temperature to low temperature with movement of mass or medium due to temperature difference in the region. Although, convection is a bit similar to conduction, but convection involves movement of substances. Such as wind system in our planet. Air moves due to temperature difference in every part of our planet. Then, CONDUCTION is the transfer of heat, of course from high temperature to low temperature when two objects (such as metals) are in direct contact (without the movement of metals).
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