Charlene Sci 7.1

<p>Gases are identified using their properties. (D)</p> Signup and view all the answers

<p>Water Vapour (A)</p> Signup and view all the answers

<p>Pink (D)</p> Signup and view all the answers

<p>No change (A)</p> Signup and view all the answers

<p>From colorless to milky (B)</p> Signup and view all the answers

<p>Dry cobalt chloride paper (C)</p> Signup and view all the answers

<p>It turns it from blue to pink (D)</p> Signup and view all the answers

<p>Hydrogencarbonate indicator (C)</p> Signup and view all the answers

<p>To avoid changing its color due to moisture from the hands (D)</p> Signup and view all the answers

<p>From blue to pink (D)</p> Signup and view all the answers

<p>Desiccator (B)</p> Signup and view all the answers

<p>Oxygen supports the burning of fuel. (B)</p> Signup and view all the answers

<p>Cooling machinery. (D)</p> Signup and view all the answers

<p>Oxygen is mixed with a fuel gas to create a hot flame. (C)</p> Signup and view all the answers

<p>Oxygen is required for cellular respiration. (B)</p> Signup and view all the answers

<p>It generates a very hot flame. (D)</p> Signup and view all the answers

<p>Helium is lighter than air (B)</p> Signup and view all the answers

<p>Argon and neon (B)</p> Signup and view all the answers

<p>21% (C)</p> Signup and view all the answers

<p>To ionize the gas and produce light (D)</p> Signup and view all the answers

<p>Nitrogen (D)</p> Signup and view all the answers

<p>They react readily with other elements (B)</p> Signup and view all the answers

<p>0.04% (A)</p> Signup and view all the answers

<p>Lighter gases allow balloons to ascend (C)</p> Signup and view all the answers

<p>They are colorless and odorless, each with unique properties. (B)</p> Signup and view all the answers

<p>Relighting a glowing splint (D)</p> Signup and view all the answers

<p>The paper turns pink from blue (A)</p> Signup and view all the answers

<p>Nitrogen (D)</p> Signup and view all the answers

<p>Glowing splint remains lit (C)</p> Signup and view all the answers

<p>Turning dry cobalt chloride paper blue (D)</p> Signup and view all the answers

Air is made up of various gases, with nitrogen being the main component.

A gas present in air in small amounts (approximately 0.04%).

Gases in air that are present in a small amount (around 0.9%).

Scientists developed tests to identify gases based on their characteristics.

The proportion of gases in air.

A type of paper used to test for the presence of water.

An experiment to detect the presence of water using cobalt chloride paper.

Cobalt chloride paper that hasn't been exposed to water, usually a light blue/pink color.

A sealed container used to keep substances dry by removing moisture from the air.

A tool used to add small amounts of liquid, like water.

Equipment used in a scientific experiment.

Purified water, free from impurities.

A visible change in the color of the cobalt chloride paper when exposed to water.

Dry cobalt chloride paper turns from blue to pink in the presence of water.

Oxygen relights a glowing splint.

Carbon dioxide turns hydrogencarbonate indicator from red to yellow and lime water from colorless to milky.

Dry cobalt chloride paper changes from blue to pink in the presence of water.

A 18th-century scientist who investigated the burning process and discovered oxygen.

Its color is blue in a dry state

Alcohol is flammable and should be handled with care.

Essential for safety when handling alcohol to avoid inhalation of fumes.

The understanding of burning changed over time, from theories like phlogiston to discovering oxygen's role in combustion.

Oxygen was discovered as the essential component for burning, replacing the old phlogiston theory.

Scientists sometimes collaborate to make discoveries, but there can also be competition for credit and recognition.

Advanced technology and tools helped scientists understand burning better by enabling precise experiments.

Oxygen is a colorless and odorless gas vital for breathing and combustion.

Carbon dioxide is another colorless and odorless gas found in the air, important for plants and the greenhouse effect.

Nitrogen makes up most of the air we breathe, though it's not used directly by humans for breathing.

Air is a mixture of gases, primarily nitrogen, oxygen, and a small amount of carbon dioxide and other gases.

Oxygen is needed to support burning. It combines with a fuel to create a flame, producing heat and light.

Oxygen is mixed with a fuel gas in a welding torch. The mixture burns very hot, allowing for cutting and welding metals.

Oxygen is used as an oxidizer to burn fuel in rockets, creating the thrust for liftoff.

Oxygen is essential for humans to survive. We breathe it in to power our bodies and cells.

Oxygen plays a vital role in supporting burning, powering rockets, and enabling human survival. It's a crucial element for various processes on Earth.

A mixture of different gases, primarily nitrogen (78%) and oxygen (21%), with smaller amounts of carbon dioxide, noble gases, water vapor, and other gases.

Helium is less dense than air, which is why helium-filled balloons float.

Neon signs contain gases like argon and neon that emit colored light when electricity is passed through them.

Noble gases like argon and neon are used to fill neon signs, which emit colorful light when electricity is passed through them.

When electricity passes through the tubes filled with gases like argon and neon, these gases give off colored light.

Air is a mixture of gases, including nitrogen (78%), oxygen (21%), carbon dioxide (0.04%), noble gases (about 0.9%), water vapor, and other gases.

Air is composed of various gases, with nitrogen making up the largest proportion (78%), followed by oxygen (21%).

There is no simple test for nitrogen. It extinguishes a flame and doesn't cause any color changes in the indicators used.