Science Quiz on Density and Atoms

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Questions and Answers

Why does a raw egg sink in water but rise in salt water?

Due to a chemical reaction with salt (correct)
Because egg whites are lighter than the water
Because of the egg's size
Due to the increased density of salt water

Which statement accurately describes a neutral atom?

It has more electrons than protons
It is positively charged
It has more protons than electrons
It has no charge (correct)

What happens when salt is crumbled?

It transforms into a new substance
A chemical change occurs
It represents a physical change (correct)
It causes an increase in temperature

How would you describe the formation of water from hydrogen and oxygen?

<p>It is a chemical change (D)</p> Signup and view all the answers

What is the relative density of milk if its density is 1030 kg/m³ and the density of water at 4°C is 1000 kg/m³?

<p>$1.03$ (C)</p> Signup and view all the answers

Flashcards

Raw egg sinking/floating in water

Eggs sink in plain water due to higher density than water, but float in salt water because the salt water's density is increased, making it higher than the egg's density

Neutral atom

An atom with an equal number of protons and electrons, having no overall charge.

Density calculation

Density = Mass / Volume. To calculate mass given density and volume, use the formula Mass = Density x Volume.

Relative Density

Relative density is the density of a substance divided by the density of a reference substance (often water).

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Physical change

A change in a substance that does not change its chemical composition, only its physical properties, such as shape or state. It involves no new substance being formed.

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