Show:
Physical vs
Chemical
SI Units
Sig Figs
Accuracy & Precision
Atom and Math
100

This type of change alters a substance's form (state) but not its composition.

What is a Physical Change? 

100

Time

What is seconds (s)

Other SI Units?

100

Number of Sigs Figs 123.84

5

( What is the rule?)

100

If repeated measurements are tightly grouped together, they are:

What is precise

(Let's Talk about Accuracy)

100

Subatomic particles with no charge are located in the ( blank) 

What is nucleus? 


(Positive charge? Location?

Negative charge? Location?)

200

When iron rusts, this type of change occurs because new substances form.

What is a chemical change? 


(what is the difference between chemical and physical change on a molecular level?)

200

Units for Density

What is mass/ volume or kg/m3 

200

Number of sigs figs 0.00836

3

( What is the rule?)

200

A scale gives the weights 25.1 g, 25.1 g, 25.2 g, 25.1 g25.1 g, 25.1 g, 25.2 g, 25.1 g, but the true weight is 24.6 g24.6 g. These measurements are:

  • A. Accurate and precise
  • B. Accurate but not precise
  • C. Precise but not accurate
  • D. Neither accurate nor precise

What is C. Precise but not accurate


(What does neither accurate nor precise look like?)

200

Substance 1: 18 protons, 23 neutrons

Substance 2: 18 protons, 25 neutrons

These are 

What are isotopes? 


(What is the element?)

300

Formation of gas, color change, and temperature shift are indicators of...

What is a Chemical change or reaction? 

300

Length

What is a meter (m)?

300

Number of Sigs Figs: 12,000

2

(What if the comma was a decimal point?)

300
  1. A thermometer gives readings 98.4∘, 101.2∘, 99.8∘, 100.1∘98.4∘, 101.2∘, 99.8∘, 100.1∘ for a true temperature of 100.0∘100.0∘. These measurements are:
  • A. Accurate and precise
  • B. Accurate but not precise
  • C. Precise but not accurate
  • D. Neither accurate nor precise
  •  What is B. Accurate but not precise


(What about accurate and precise?)

300

 

An element has the following natural abundances and isotopic masses:

  • 72.15% abundance with 63.00 amu

  • 27.45% abundance with 65.00 amu

  • 0.40% abundance with 66.00 amu

Calculate the average atomic mass of this element.

What is 63.56 amu?

(Steps?)

400

Melting ice and burning wood both involve temperature changes, but only one changes chemical identity.

What is burning wood?

400

Amount of substance

 What is mole (mol)?

400

Number of sig figs:1004

4

(What is the rule?)

400

If a balance is not zeroed correctly before use, this is (blank) 

what is a systemic error

400

A bag of sugar weighs 2.5 lb. How many grams of sugar are in the bag?

1 lb=16 oz.  1 lb=454 g


What is 1135 g? 


(Steps?)