Chem unit review

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Questions and Answers

Which lab equipment is specifically designed to hold, mix, and heat chemical samples?

Erlenmeyer Flasks

Beakers

Test tubes (correct)

Spot plates

Which of the following is a chemical property?

Density

Color

Boiling point

Rusting (correct)

What is the primary function of a glass stir rod?

Holding small reactions

Measuring the volume of liquids

Mixing solutions (correct)

Heating liquids

Which of the following lab equipment is best suited for performing reactions involving small volumes of chemicals?

Spot plates (A) Signup and view all the answers

Which of these is NOT a chemical change?

Mixing (C), Melting (F) Signup and view all the answers

Which hazard category symbol represents a substance that could potentially cause damage to both metals and skin?

Corrosion Symbol (D) Signup and view all the answers

Which hazard category symbol is associated with substances that may cause damage to the aquatic environment?

Environmental Symbol (C) Signup and view all the answers

Which statement accurately describes why the Safety Data Sheet (SDS) is important to refer to?

The SDS offers detailed information and precautions for handling the substance. (A) Signup and view all the answers

Which hazard category is associated with the potential for an explosion when the substance is exposed to certain conditions?

Exploding Bomb (B) Signup and view all the answers

Which hazard category symbol most likely indicates a substance with a potential for causing serious health effects, possibly leading to death, even with short exposure to small amounts?

Skull and Crossbones (C) Signup and view all the answers

What is a common characteristic of alkali metals?

They are shiny, silvery, and highly reactive. (A) Signup and view all the answers

How are elements in the same group of the periodic table similar?

They share similar chemical properties. (B) Signup and view all the answers

Which of the following statements is true about noble gases?

They are stable and unreactive. (A) Signup and view all the answers

What distinguishes metalloids from metals and non-metals?

Metalloids possess properties of both metals and non-metals. (A) Signup and view all the answers

What are lanthanides and actinides primarily known for?

Their radioactive nature. (A) Signup and view all the answers

Which of the following properties would be most useful in identifying vinegar?

Odour (B) Signup and view all the answers

Based on its position in the Periodic Table, what is the charge of the ion formed by phosphorus?

$-3$ (D) Signup and view all the answers

Which of the following is an example of a chemical property?

The ability of magnesium to burn in air (B) Signup and view all the answers

Which element in the table has the most valence electrons?

Phosphorus (B) Signup and view all the answers

Why are Group 1 elements highly reactive?

They have a single valence electron that they readily lose. (D) Signup and view all the answers

Which option is an example of a chemical change?

A slice of bread is toasted. (C) Signup and view all the answers

Which term describes a substance that allows light to pass through but not clearly?

Translucent (D) Signup and view all the answers

What does a drastic color change in a reaction typically indicate?

A chemical change has occurred. (C) Signup and view all the answers

In ionic bonding, what happens to metals?

They lose electrons to become positively charged. (B) Signup and view all the answers

How many electrons does oxygen typically share with other elements?

2 (B) Signup and view all the answers

What does the subscript in a chemical formula denote?

The number of atoms of an element in the molecule. (A) Signup and view all the answers

What would imply that a mixture is undergoing a physical change?

Dissolving substances. (C) Signup and view all the answers

Which of the following pairs are both classified as a chemical change?

Burning wood and souring milk. (C) Signup and view all the answers

Which observation is NOT considered evidence of a chemical change?

Change in state from solid to liquid. (B) Signup and view all the answers

What is the primary reason for atoms to bond together?

To achieve a full set of electrons. (C) Signup and view all the answers

Which of the following steps in the scientific method is most closely associated with recording data in a structured way?

Analysis (A) Signup and view all the answers

What kind of observation is it when you note that a substance changes color during a reaction?

Qualitative (C) Signup and view all the answers

Consider the following hypothesis: "If I add heat to ice, it will melt." Which step of the scientific method does this statement belong to?

Hypothesis (A) Signup and view all the answers

In scientific method, what is the difference between a hypothesis and a conclusion?

A hypothesis is a prediction, while a conclusion is a summary of findings. (D) Signup and view all the answers

Which of these is an example of an inference rather than a direct observation?

The plant is wilting because it doesn't have enough water. (B) Signup and view all the answers

Which of the following is a characteristic of a chemical change?

Gas is formed (C) Signup and view all the answers

What evidence can indicate a physical change occurred?

Dissolving a sugar cube in water (A) Signup and view all the answers

Which of the following properties describes how a substance can change into a new substance?

Flammability (C) Signup and view all the answers

What key distinction separates a physical change from a chemical change?

A chemical change results in the formation of new substances (D) Signup and view all the answers

Which of these would NOT be classified as a physical property?

Corrosiveness (D) Signup and view all the answers

What does WHMIS stand for?

Workplace Hazardous Materials Information System (A) Signup and view all the answers

Which description corresponds to a symbol indicating 'may cause or suspected of causing serious health effects'?

f) may cause or suspected of causing serious health effects (A) Signup and view all the answers

Which lab equipment is specifically designed for accurate measurement of liquid volume?

Graduated Cylinder (D) Signup and view all the answers

Which hazard symbol represents a substance that could be explosively reactive?

e) dangerously reactive--fire hazard gases under pressure (C) Signup and view all the answers

Study Notes

Lab Equipment and Uses

Rusting is a chemical process, producing a new substance.
Chemical properties are evident during or after a chemical reaction.
Rotting is a chemical change, involving a chemical reaction.
Erlenmeyer flasks hold liquids, possibly releasing gases.
Glass stir rods are for stirring solutions.
Spot plates are for small reactions at a time.
Test tubes hold, mix, and heat chemicals.
Beakers hold liquid or solid samples, or for reactions.
Electronic balances measure the mass of substances accurately.
Beaker, a piece of scientific equipment often used in the lab for mixing chemicals, holding solutions, or even heating substances.
Graduated cylinders are used to measure the volume of liquids.
Funnels are used to pour liquids into containers with small openings.

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Description

This quiz explores various lab equipment and their uses in chemical processes. It covers topics such as rusting, rotting, and the properties of different lab tools. Test your understanding of laboratory practices and the significance of chemical reactions.