Chemistry 1010

Flashcards I made cuz my teacher wont teach me ANYTHING. I take the dual enrollment course & this is from the beginning of the year, just randomized cuz I have a test soon.

Matter

Anything that has mass and takes up space

What charge do protons have?

Positive

What charge do electrons have?

Negative

What charge do neutrons have?

Neutral/no charge

Which particles are found in the nucleus of an atom?

Protons and Neutrons

Which particles have the same number as each other in a neutral atom?

Protons and Electrons

The mass number is determined by which particles?

Protons and Neutrons

The atomic number is identified by ___

The number of protons

In an endothermic reaction, ____

heat goes into the system

In an exothermic reaction, ___

heat leaves the system

An endothermic reaction ___ heat and products have ___ energy than the reactants did

take in : more

An exothermic reaction ___ energy and products have ___ energy than the reactants did

release : less

Which two particles of an atom have nearly identical masses?

Protons & Neutrons

Rutherfolds gold foil experiment determined that ___

most of the space in an atom is empty except for a concentrated area called the nucleus

What fundamental force is responsible for holding together the subatomic particles of an atomic nucleus?

Strong nuclear force

Calculate the mass number for an atom of Calcium containing 20 protons and 28 neutrons

48

Which scientist developed the nuclear model of the atom?

Ernest Rutherford

Determine the atomic number for an isotope where the mass number is 70 and the number of neutrons is 38 per atom

32

A theory is another word for a(n) ___

model

An irregularly shaped piece of Aluminum (Al) has a mass of 52.1 g. What is the volume, in cm³, of this piece of aluminum if its density is 2.70g/cm³?

19.3 cm³

What is the term for a statement that summarizes many prior observations and can be used to predict future ones?

scientific law

Which of these is an exact number?

2235 protons, 100 cm in 1 m

The measurement 0.0003870 written in scientific notation is:

3.870 × 10^-4

How many significant figures are in the number 36,700?

3

The value of this calculation, rounded to proper significance, is:

3.84 / (0.058 × 14.3)

4.6

Which of these are physical changes?

A. ripening of a tomato

B. digesting a meal

C. frost forming on a windshield

D. olive oil gets very hot in a pan

E. scratching a gold ring

C, D, and E

How would you classify brass and stainless steel?

mixture — homogeneous

Which state(s) are essentially not compressible?

solids and liquids

The energy stored in the chemical bonds of a carbohydrate is:

potential energy