chemistry difficulties?

Question

1: In 1803 a famous version of the atomic theory was announced by
Dalton
Moseley
Priestly
Rutherford


2: The molecular weight of Mg3(PO4)2 is
189
262
354
448


3: The number of atoms represented by the formula (NH4)2Cr2O7 is
11
18
19
23


4: The symbol for antimony is
A
Sb
Sc
Se


5: The formula Cl2 represents one
atom
ion
molecule
radical


6: A substance having a molecular (formula) weight of 58 is
CaSO4
HCl
KNO3
Mg(OH)2


7: The number of atoms in the ozone molecule is
one
two
three
four


8: The total number of atoms of carbon in the formula K3Fe(CN)6 is
one
six
three
twelve


9: The smallest part of an element taking part in a chemical change is a(n)
molecule
atom
compound
mixture


10: The weight of one atom of oxygen is known as the
atomic weight
valence
charge
combining power


11: The sum of the weights of the atoms of a compound is known as the compound's
valence
combining power
molecule
molecular weight


12: The one or two letters used to represent an atom of an element are called a(n)
atom
symbol
molecule
compound


13: A group of symbols representing one molecule of a substance is called a(n)
atom
formula
equation
subscript


14: Two atoms joined together as in H2 make up a(n)
monatomic molecule
diatomic molecule
equation
none of the above


15: Numbers placed before a formula to represent more than one molecule of a substance are called
subscripts
coefficients
constants
remainder

Answer 1

take home test?

1. Dalton

2. 262

3. 19

4.Sb

5. molecule

6. Mg(OH)2

7. three

8. six

9. atom

10. atomic weight

11. molecular weight

12. symbol

13. formula

14. diatomic molecule

15. coefficients

you're lucky i like chem...wish my chem class was this easy

Answer 2

1) Dalton
2) (24 x 3) + (31 x 2) + (16 x 8)
3) 19
4) Sb
5) molecule
6) Mg (OH)2
7) three
8) six
9) atom
10) atomic weight (mass)
11) molecular weight (mass)
12) symbol
13) formula
14) diatomic molecule
15) coefficients

Answer 3

Don't you have a textbook that can explain these things to you? Then you would actually understand it and do well on the test as opposed to somebody telling you the answers. If you don't have a book, talk to your teacher or look up questions online.

http://www.tps.k12.mi.us/staff/eferwerda/Chem_help_page.htm