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WorksheetsMid 9 Chem. most missed
Total questions: 10
Worksheet time: 5mins
The average distance from Earth to the Moon is 384,401 km. How is the distance from Earth to the Moon expressed in scientific notation
384 x 10^3 km
3.84 x 10^3 km
3.84 x 10 ^5 km
3.84 x 10^6 km
A student places 8 milliliers of silver nitrate solution into each of two test tubes. The student then adds 2 grams of copper shavings to Test Tube A and does not add any coppoer to Test Tube B. Which is the best explanation for placing copper only in Test Tube A?
To reduce the number of variables being tested
to predict how air alone affet the silver nitrate
to observe what happens to copper when exposed to air
to use the other test tube as a control for the experiment
An atom of chromium has 24 protons, 28 neutrons, and 24 electrons. How many subatomic particles are in the nucleus of a chromium atom?
24
28
48
52
Mercury are gold are both metals. Unlike gold, mercury cannot be used to make jewelry because it is a liquid at room temperature. The difference in the state of matter of the two metals is an example of a/n __ property
nuclear
electrical
chemical
physical
An atom in tin has an atomic number of 50 and a mass number of 119. How many protons, electrons and neutrons are found in one neutral atom of tin?
50 protons, 69 electrons, 50 neutrons
50 protons, 50 electrons, 69 neutrons
69 protons, 50 electrons, 69 neutrons
69 protons, 69 electrons, 50 neutrons
How is Modern Model of an atom different from the Bohr Atomic model?
The arrangement of the electrons are different
the number of electrons are different
the shape of the nuclei are different
the masses of the atomic particles are different
A group of science students used water, filter paper and a hot plate to separate a mixture of salt and sand. Which of the following did the students most likely do first?
shake the mixture until the sand settles on the bottom
pour the mixture through the filter paper
heat the mixture on the hot plate
dissolving the salt by adding water to the mixture
When a base is mixed with an acidic solution, neutralization occurs because the .....
acid evaporate
mass of the solution increases
base reaches absolute zero
base chemically reacts with the acid
What is the volume
20ml
20.4ml
24ml
23ml
An unknown substance with mass of 56.5 grams is placed in a graduated cylinder.
What is the identity of the unknown substance?
aluminum
gold
iron
lead
