HESI chemistry

If an element has a mass number of 14 and contains 8 neutrons what is the atomic number?

6. Mass number= protons + neutrons

Different isotopes have the same number of _________and different number of _________

Protons ; neutrons

What is the systematic name of ammonia, NH3?

Nitrogen Trihydride

What subatomic particles are found in the nucleus and are without a charge?

neutrons

What term describes urine sample with a pH of 5.5

acidic

What term describes the region in space where there is a high probability of finding an electron?

atomic orbital

Bacon grease is solid at room temperature vegetable oil is liquid at room temperature both are examples of_________

Lipids

What is the chemical formula of copper cyanide

CuCN

What term means the substance the solute is dissolved into?

Solvent

What is the molecule weight of ethanol, C2H5OH? The atomic masses are?

Carbon 12.01

Hydrogen 1.01

Oxygen 16.00

Answer= 46.08 multiple the atomic weight of each element by the subscript that follows the element

So 12.01x2= 24.02

1.01 x 5= 5.05 +

O=16.00 + H 1.01 = 46.08

What term describes the attraction of two ions for the opposite charge

Electrostatic forces

What term best describes NaOH in this reaction?

NaOH is a reactant

What is the oxidation number of magnesium in any compound

+2

Which statement regarding atomic size is true

Neutral K is larger than K+

What type of bio chemical molecule contains two or more amino acids joined by peptide bonds

Protein

What type of bond is caused by the electrostatic attraction between a metal and a nonmetal

Ionic bonds

The state of water at room temperature is

liquid

Which statement is correct about an element

Iron is a transition metal

the Strongest intermolecular forces are

hydrogen bonds

The lower the pH the more

acidic

Which is true of compounds and mixtures

A compound can be separated chemically but cannot be separated physically

The law of conservation of energy states that energy

Can change forms but cannot be created or distorted

an element has a mass number of 7 and contains 3 protons how many neutrons does it have?

4 Mass= mass - protons

What is the term meaning the amount of energy necessary to raise the temperature of 1 gram of a substance by 1°C

Specific heat capacity

A _________ has a fixed composition and distinct properties

Compound

__________occurs when hydrogen and hydroxide ions are combined in equal concentration

Neutralization

What is the fraction 3/260is scientific notation figures

3/260= 1.15x 10^-2

The sub atomic particle with the least mass is the

Electron

What do we call protons electrons and neutrons as a group

Subatomic particles

What statement is correct about an element

Iron is a transition metal