Q2. Which of these is a mixture?

1. chlorine

2. sodium chloride solution

3. sodium

4, sodium chloride

Which of the following statements is a part of John Dalton's atomic theory? Every compound is composed of atoms of a single element. All atoms of all elements are exactly alike and have the same mass.

An atom has a mass number of 52. if there are 27 neutrons in the atom, then the atom must be:

Which components do all circuits have in common? Check all that apply. - energy source - voltmeter - wires - ammeter - device that needs electrical energy

Which of the following is an example of a chemical change? Select one: a. pounding gold into a coin b. a puddle of water evaporating c. paint fading d. ice melting

Why indicators are important?

Which statement is true for a pure compound but NOT true for a pure element?

Which one is uncelluar and which is multicelluar? crab or pond organism

An atom of lithium loses an electron. What is the effect of this event? Group of answer choices The atom of a different element is formed. The atom of lithium acquires no charge. The atom of lithium becomes a positively charged ion.

Water interacts with polar substances like - OH groups but not with non-polar substances like methyl (-CH3) or ethyl groups (-CH2). Using this information, select the molecules that will easily dissolve in water based on polarity not on size.

Which of the following statements is not considered weather? The wind is blowing 20 miles per hour right now in Kansas. It is raining in Seattle. It is usually humid in Florida. It is snowing in Colorado.