Based on dalton's atomic theory, which of the following is true about all atoms of the same element?
a. they have different masses
b. they have the same properties.
c. they can be divided into molecules.
d. they are composed of visible matter.

2. which of the following is a compound?
a. ne
b. n2
c. naci
d. o2

3.which of the following indicates that an endothermic reaction has occurred?
a. heat is released
b. water is formed
c. salt is produced
d. temperature decreases

4. what is a homogeneous mixture called when microscopically insoluble particles are suspended throughout another substance?
a. colloid
b. compound
c. emulsion
d. solution

5. which particle moves around the nucleus?
a. electron
b. molecule
c. neutron
d. proton

6. two different sub-atomic particles are described below:

particle x: no charge
particle y: outside the nucleus

which statement is true?
a. x is a neutron and y is an electron
b. x is a neutron and y is a proton
c. x is a proton and y is an electron
d. x is an electron and y is a proton.

Based on Dalton's atomic theory, which of the following is true about all atoms of the same element?
A. They have different masses (atoms are identical #2)
B. They have the same properties.(supported by point #2)
C.They can be divided into molecules. (point #5 proves this choice is incorrect.)
D.They are composed of visible matter. (atoms are too tiny to see with the naked eye #1)

- Dalton's atomic theory(5 points)
1. Elements are made of tiny particles called atoms
2. all atoms in an element are identical
3. Atoms of one element are different from atoms of another.
4. Atoms of one element can combine with atoms of a different element in order to form compounds.
5. Atoms are indivisible by chemical reactions. They can rearrange, but cannot be broken down into smaller parts chemically.

2. Which of the following is a compound?
A. NE - "E" is not an element on the periodic table. This is not a chemical compound.
B. N2(This is an example of an pure element because There is only one leter in the formula. This is pure elemental nitrogen)
C. NaCI- This is a combination of a sodium atom(Na) and Chlorine atom(Cl) to form the compound NaCl, this is also commonly known as table salt.
D. O2- (again like answer choice B. this is a pure element and not a combination of different atoms.)

3.Which of the following indicates that an endothermic reaction has occurred? 
A. Heat is released (exothermic reactions EXhale(releases) heat)
B. Water is formed
C. Salt is produced
D. Temperature decreases (endothermic reactions require energy to take place. This energy is usually heat energy that is absorbed by the recation. Therefore, temperature would decrease.

4. What is a homogeneous mixture called when microscopically insoluble particles are suspended throughout another substance?
A. Colloid
B. Compound- a substance made when different atoms combine together to form one substance
C.Emulsion- droplets of one liquid dispersed in another liquid in which it is not soluble
D. Solution- a solute is disolved by a solute ex:salt water

5. Which particle moves around the nucleus?
A.Electron
B. Molecule- too big to revolve around a nucleus
C.Neutron- found inside the nucleus
D. Proton- found inside the nucleus

6. Two different sub-atomic particles are described below:

Particle X: No charge neutron (neutrons are NEUTRALLY CHARGED)
Particle Y: Outside the nucleus Electron (orbits the nucleus)

Which statement is true?
A. X is a neutron and Y is an electron
B. X is a neutron and Y is a proton
C. X is a proton and Y is an electron
D. X is an electron and Y is a proton. 

 Hope this helped you out :)