2025 Midterm Reflection
Quiz
•
Science
•
11th Grade
•
Practice Problem
•
Hard
Alexis Moreno
FREE Resource
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30 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A radioactive isotope has a half-life of 2.5 years. Which fraction of the original mass remains unchanged after 10. years?
1/2
1/4
1/8
1/16
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Given the balanced equation: 2KI + F₂ → 2KF + I₂ Which type of chemical reaction does this equation represent?
single replacement
synthesis
decomposition
double replacement
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which element is listed with the number of protons in each of its atoms?
silicon, 14
nitrogen, 14
oxygen, 16
phosphorous, 16
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A 1.0-gram sample of NaCl(s) is dissolved in 100. grams of water at 25°C, and another 1.0-gram sample of NaCl(s) is dissolved in 50. grams of water at 25°C. Which property of the two resulting mixtures will be different?
polarity of the components in the mixture
color of the components in the mixture
particle size of the components in the mixture
proportion by mass of the components in the mixture
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which radioisotope requires long-term storage to prevent the risk of biological exposure?
Pu-239
Au-198
K-42
N-16
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A sample is composed of two different substances that can be separated by using filter paper. This sample is classified as
an unsaturated solution
a homogeneous mixture
a heterogeneous mixture
a single compound
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A compound consists of two or more different elements that are
chemically combined in a proportion that can vary
physically mixed in a fixed proportion
chemically combined in a fixed proportion
physically mixed in a proportion that can vary
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