Classify matter as: homogeneous or heterogeneous; pure substance or mixture; element or compound; metals, nonmetals or metalloids; solution, colloid or suspension.
Compare nuclear reactions including alpha decay, beta decay and gamma decay; nuclear fusion and nuclear fission.
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Q 1/28
Score 0
A child fills a bucket with salt water and sand. How are the contents of the bucket
classified?
30
a compound
a homogeneous mixture
a solution
a heterogeneous mixture
Q 2/28
Score 0
How are the processes of melting and freezing similar?
30
They are both processes that physically change a substance.
They are both processes where heat is released by a substance
They are both processes where heat is absorbed by a substance.
They are both processes that chemically change a substance.
28 questions
Q.
A child fills a bucket with salt water and sand. How are the contents of the bucket
classified?
1
30 sec
PSc.2.1.1
Q.
How are the processes of melting and freezing similar?
2
30 sec
PSc.2.1.2
Q.
Which element is classified as a metal?
3
30 sec
PSc.2.1.1
Q.
Four different liquids will be separately poured into a single beaker. The liquids are ethanol, milk, oil, and water. The density for each liquid at room temperature is listed in the table below. How will the liquids be arranged from bottom to top in the beaker?
4
30 sec
PSc.2.1.3
Q.
The diagram below is the Bohr model of an atom. Which best describes this atom?
5
30 sec
PSc.2.1.4
Q.
How does a piece of paper’s ability to be folded in half compare to its ability to burn?
6
30 sec
PSc.2.1.3
Q.
How many valence electrons are in a neutral atom of nitrogen (N)?
7
30 sec
PSc.2.2.1
Q.
Electrons are being shared between atoms in a certain compound. Which elements could most likely form this compound?
8
30 sec
PSc.2.2.2
Q.
What is the chemical formula for magnesium acetate?
9
30 sec
PSc.2.2.3
Q.
Which represents a balanced chemical equation?
10
30 sec
PSc.2.2.4
Q.
What type of chemical reaction occurs when beryllium (Be) combines with oxygen (O2) to form beryllium oxide (BeO)?
11
30 sec
PSc.2.2.5
Q.
Which equation represents a neutralization reaction?
12
30 sec
PSc.2.2.6
Q.
Which of these elements is the most chemically reactive?
13
30 sec
PSc.2.2.1
Q.
Which compound contains ionic bonds?
14
30 sec
PSc.2.2.2
Q.
This unbalanced equation represents a chemical reaction:
Pb(NO3)2 + NaI → NaNO3 + PbI2
What is the coefficient for NaI once the equation is balanced?
15
30 sec
PSc.2.2.4
Q.
What type of bond will form when an element from group 2 (IIA) bonds with an element from group 17 (VIIA)?
16
30 sec
PSc.2.2.2
Q.
This chart shows the effects of several solutions on litmus paper. Which information can be determined from the litmus paper tests?
17
30 sec
PSc.2.2.6
Q.
A 100-gram sample of cerium-143 has a half-life of 33 hours. How long will it take until there are only 6.25 grams of cerium-143 left?
18
30 sec
PSc.2.3.2
Q.
Thallium-208 has a half-life of 3 minutes. How long will it take 60.0 g of thallium-208 to decay so that 15.0 g of the thallium-208 remains?
19
30 sec
PSc.2.3.2
Q.
Which substance is most likely classified as a colloid?
20
30 sec
PSc.2.1.1
Q.
Atoms of which two elements will form an ionic bond?
21
30 sec
PSc.2.2.2
Q.
Which compound will most likely be formed when lithium (Li) and nitrogen (N) are chemically combined?
22
30 sec
PSc.2.2.3
Q.
Which compound results from covalent bonding?
23
30 sec
PSc.2.2.2
Q.
Why are beta particles able to penetrate objects better than alpha particles are?
24
30 sec
PSc.2.3.1
Q.
This diagram represents a neutral atom of fluorine-19.
Which best describes the structure of fluorine-19?
25
30 sec
PSc.2.1.4
Q.
Which type of chemical bond accounts for the high electrical conductivity in a bar of pure silver (Ag)?
26
30 sec
PSc.2.2.2
Q.
Which equation represents a decomposition chemical reaction?
27
30 sec
PSc.2.2.5
Q.
This unbalanced equation represents a chemical reaction:
HgO → Hg + O2
Which is the correctly balanced chemical equation for this reaction?
