Chemistry Semester 1 Exam Review

Mia is learning about units of measurement in her science class. She needs to identify which of the following is NOT an SI base unit. Can you help her?

• meter

• pounds

• kilogram

• second

Nora is measuring the lengths of three different ribbons for a craft project. The lengths are 5.31 cm, 8.4 cm, and 7.932 cm. Calculate the total length of the ribbons with the correct number of significant figures.

• 22 cm

• 21.6 cm

• 21.642 cm

• 21.64 cm

Nora is measuring the mass of a sample in her chemistry lab, and she records it as 702.0 g. What is the correct representation of this mass in scientific notation?

• 7.020 × 10²

• 7.02 × 10³

• 70.20 × 10²

• 70.20 × 10¹

Anika measured the distance from her house to the school and found it to be 20.070 km. How many significant figures are there in this measurement?

• 2

• 3

• 4

• 5

Olivia is running a race and covers a distance of 4.84 meters in 2.4 seconds. Calculate her speed and round if necessary:

• 2m/s

• 2.0m/s

• 2.00m/s

• 2.017m/s

Tags

NGSS.MS-PS3-1

William is conducting an experiment where he combines 44.6 grams of iron (Fe) with 12.8 grams of oxygen (O₂). What is the mass of the product formed?

• 31.8 grams

• 571 grams

• 3.48 grams

• 57.4 grams

Tags

NGSS.MS-PS1-5

Maya and Daniel conducted an experiment in a closed container where they reacted two elements to completion. They observed that the ratio of their masses in the container remained the same as before the reaction. Which law describes this principle?

• law of random proportions

• law of conservation of mass

• law of chemical equilibrium

• law of indefinite proportions

Tags

NGSS.MS-PS1-5

A percentage determined by the ratio of the masses of each element to the total mass of the compound is called the ____

• molar mass

• percent by mass

• atomic mass

• percent weight

Tags

NGSS.HS-PS1-7

Emma is baking a cake and uses 20.0 g of sugar, which contains 8.4 g of carbon. What is the mass percentage of carbon in the sugar she used?

• 68.00%

• 42.00%

• 27.76%

• 72.24%

Tags

NGSS.MS-PS1-1

During a science class, Isla was asked to identify the negatively-charged particle in an atom. What should she answer?

• neutron

• positron

• proton

• electron