Mid 9 Chem. most missed

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

Tags

NGSS.MS-PS1-4

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

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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

Tags

NGSS.MS-PS1-2

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

Tags

NGSS.MS-PS1-2