Click a card to flip it and reveal the answer.
Task cards — solve, then click to check.
R1 read + count • R2 count sig figs • R3 sig-fig arithmetic. Solve, then click to check.
R1a
Reading? Balance shows between 5.60 and 5.70 g — measure to 0.01 g
ANSWER
5.65 g — 2 decimals; estimate 0.01 | 3 sig figs
R1b
How many sig figs? 0.0305 g
ANSWER
3 sig figs — leading zeros don’t count; 3, 0, 5 count
R1c
Ruler reading between 2 and 3 cm (mm marks) — read to 0.1 cm
ANSWER
2.6 cm — mm marks; estimate 0.1 cm | 2 sig figs
R1d
How many sig figs? 25.000 mL
ANSWER
5 sig figs — trailing zeros after decimal count
R2a
Count sig figs: 1040 m
ANSWER
4 sig figs — interior 0 and trailing 0 count (ambiguous)
R2b
Count sig figs: 0.007 g
ANSWER
1 sig fig — leading zeros don’t count
R2c
Count sig figs: 9.10 s
ANSWER
3 sig figs — trailing zero after decimal counts
R2d
Count sig figs: 2050.0 g
ANSWER
5 sig figs — decimal present: all zeros count
R3a
3.50 + 4.1 = ? (use least decimal places)
ANSWER
7.6 — add: round to least decimal place (tenths)
R3b
2.00 × 3.0 = ? (use least sig figs)
ANSWER
6.0 = 6 — multiply: least sig figs (2)
ANSWER
4.00 — divide: least sig figs (3)
ANSWER
0.4 — subtract: least decimal place: 0.45−0.1=0.35→0.4