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hjlf
3 years ago
10

3. What do the most abundant elements in Earth's atmosphere have in common?​

Chemistry
1 answer:
Advocard [28]3 years ago
8 0

Answer:

They all have: nitrogen :780,900 755,100

oxygen: 209,500 231,500

argon 9,300 12,800

carbon dioxide

386 591

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Myra wants to measure the pH of a sample of drinking water as accurately as possible. What method should she use?
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7 0
3 years ago
instrucions classify the following reactions as synthesis, decomposition,single replacement, double replacement, or combustion.
My name is Ann [436]

Answer:

There are no specific equations but here what i can give you:

1. Synthesis -- A synthesis reaction is a chemical change in which two or more substances react to form a single new substance.

In all synthesis reactions, there is a single product that is a compound!

2. Decomposition -- A decomposition reaction is a chemical change in which a single compound breaks down into two or more simpler products. (This is the opposite of synthesis reactions!)

Most decomposition reactions require energy in the form of heat, light, and electricity.

3. Single Replacement -- A single-replacement reaction is a chemical change in which one element replaces a second element in a compound. You can identify a single-replacement reaction by noting that both the reactants and the products consist of an element and a compound.

4. Double Replacement -- A double-replacement reaction is a chemical change involving an exchange of positive ions between two compounds.

For a double replacement reactions to occur, one of the following is usually true:

- One of the products is only slightly soluble and precipitates from solutions.

- One of the products is a gas.

- One product is a molecular compound such as water.

5. Combustion -- A combustion reactions is a chemical change in which an element or a compound reacts with oxygen, often producing energy in the form of heat or light.

A combustion reactant always involves oxygen as a reactant. (If the supply of oxygen is limited, then the combustion will not be complete.)

The other reactant is a hydrocarbon, which is a compound composed of hydrogen and carbon and the complete combustion of a hydrocarbon produces CO2 and H2O.

Hydrocarbons include methane, propane, and butane.

I really hope this helps you!

3 0
3 years ago
Looking at the periodic table, which of these elements has the smallest atomic radius?
Sauron [17]
Helium
Remember: electron filling of atomic shell  ...
 The element which have electron in the lowest quantum shell will have the smallest atomic radius\

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H:1s2   (hydrogen)
8 0
3 years ago
HELP WILL GIVE BRANLIEST
klio [65]

Answer:

A

Explanation:

Sucrose and water are both compounds made up of more than one type of atom.

Water(H2O)= Hydrogen and Oxygen

Sucrose(C12H22O11)= Carbon Hydrogen & Oxygen

8 0
3 years ago
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Natasha2012 [34]
They are unicellular organisms with flagella.
They do not have a cell wall.
They have a thick outer covering, known as pellicle, that is composed of protein and gives them both strength and flexibility.
They are eukaryotes.
7 0
3 years ago
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