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Oliga [24]
3 years ago
5

PLEASE HELP WILL GIVE BRAINLEST

Chemistry
1 answer:
aliina [53]3 years ago
8 0

Answer:

Option A.

Lower air pressure results in a lower boiling point

Explanation:

This is because in an open system, the lower the pressure the lesser the energy that will be required for boiling point. The is little or no collision of air molecules with the surface of the liquid

But if there is increase in pressure, more energy will be required to get to boiling point because there will be strong collision between air molecules and surface of the liquid.

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Match the terms to their definition. 1. element one of the starting substances (ingredients) that is involved in a chemical reac
Kryger [21]

Answer:

1. Element - a substance that is made from only one type of atom

An element is made up of only one type of atoms and known for its unique properties than other elements.

2. Heterogeneous -  composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture

3.Homogenous - even distribution of parts throughout the whole mixture; not easily separated into individual components.

4. Product - the substance created as a result of a chemical reaction

Products are the final substance that created as a result of a chemical reaction.

5. Reactant - one of the starting substances (ingredients) that is involved in a chemical reaction

Reactants are the starting substance that takes part in a chemical reaction.

6. Solute - the substance that is being dissolved.

A Solute is a substance that is being dissolved in the solvent to make a solution.

7. Solvent - the substance that does the dissolving

A solvent is the medium in which the solute is being dissolved to make the solution.

5 0
3 years ago
Is weathering a physical or chemical change, and why?
kumpel [21]
Weathering would be chemical because it's more natural than physical
7 0
3 years ago
How many moles of H2 are needed to react with 4.8 mol of O2 ?
VLD [36.1K]

Answer:

9.6 mol

Explanation:

Start by writing out the balanced equation of the reaction.

2H_{2} + O_{2} ⇒ 2H_{2}O

Here you will see 2 mol of hydrogen for every 1 mol of oxygen. Using this ratio, you can assume the amount of hydrogen will always be double that of oxygen. In this case, 4.8 * 2 = 9.6

5 0
2 years ago
Which elements are rarely found in organic molecules
Marizza181 [45]

Answer:

k

Explanation:

6 0
3 years ago
Radium decays to form radon. *x26Ra 222 Rn + He 86 This type of nuclear decay is called​
mestny [16]

Answer: it's alpha decay (α)

Explanation: mass number of mother nucleus decreases by four and number of protons decreases by two. Smaller nucleus is He-4 nucleus.

3 0
3 years ago
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