FREE AND STUDY GAMES ABOUT 8TH GRADE CHEMISTRY

PDF Download

FREE AND STUDY GAMES ABOUT 8TH GRADE CHEMISTRY

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -78 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: what is atomic mass

Answer:

total number of protons in an atoms's nucleus and is on the periodic table (may not be a whole number- average)

Question 2: what is isotopes

Answer:

are atoms of the same elements that have different number of neutrons than normal. some have many when others have a few.

Question 3: what are neutron relative mass

Answer:

2000

Question 4: how do you change from standard to scientific notation and back

Answer:

2000+10000= 20^6

Question 5: where do electrons live

Answer:

in the orbit or shell or energy levels

Question 6: how many valance electrons do the elements in group 1 have

Answer:

1

Question 7: anions

Answer:

non-metals tend to gain one or more electrons to form negative ions

Question 8: What were the 4 main points of Dalton in the universe

Answer:

• all elements are composed of atoms- they are indivisible and indestructible particle.
• atoms are the same element are exactly alike. 3.atoms are different elements are different.
• compounds are formed by the joining of atoms of two or more elements

Question 9: from what row labeled period 3 taken

Answer:

top starting left and going right

Question 10: what is the periodic table

Answer:

it shows a periodic or repeating pattern of properties of the elements. left space for new elements to be discovered.

Question 11: what are proton relative mass

Answer:

2000

Question 12: what are the elements

Answer:

a substance that cannot be broken down into a simpler substance by ordinary chemical change.

Question 13: what are electrons location

Answer:

orbits the nucleus in the shell

Question 14: what organization model did Mendeleev use?

Answer:

periodic table

Question 15: What are proton

Answer:

positively charged particles- P+

Question 16: group is

Answer:

the elements in a column- family of elements- usually related the atomic size decrease as it moves from left to right

Question 17: which group has a full outer most shell

Answer:

18

Question 18: do electrons closer to the nucleus have higher or lower energy?

Answer:

lower energy closer to the nucleus Question 19: when determining the number of valence electrons in the outermost shell of an atom, you should look at the ______ on the periodic table

Answer:

group (column)

Question 20: what are neutron location

Answer:

nucleus- center of atom

Question 21: how do you organize elements base on reactivity

Answer:

least to greatest (lithium, silicon, argon

Question 22: what is alkali metals

Answer:

very reactive metal, not found as free element in nature, always bonded

Question 23: what is electron charge

Answer:

-1

Question 24: cations

Answer:

metals losing one or more electrons to form positive ions

Question 25: what is matter

Answer:

anything that has mass and takes up space

Question 26: what is an example of isotope element

Answer:

carbon, radon, potassium, uranium Question 27: how do you determine whether an element is going to gain or lose ions.

Answer:

depending if they are 4 or less or 4 or more on the outer shell ring. less than 4 they will lose, 4 or more they will gain.

Question 28: how is the table organized

Answer:

by the atoms of the elements - atomic number (atomic mass is on the bottom)