# Which set of tools will provide the most precise measurement for calculating the density of an irregular shaped rock?

## Which set of tools will provide the most precise measurement for calculating the density of an irregular shaped rock?

Because they will be using the volume to calculate density, students should record the volume of the sample in cm3. Student groups will not need to measure the mass of the rods. The mass of each rod is the same, 15 grams, and is given in their chart on the activity sheet.

What part of an atom is most directly involved?

The electrons of an atom, in particular valence electrons, are involved in chemical bonding. The reason is that the electrons are the most moveable…

### Which part of an atom is most directly involved in chemical bonding *?

Atoms have a central nucleus with positively charged protons and neutral neutrons; negatively charged electrons circle the nucleus. The electrons that are involved in chemical bonding are those electrons in the outermost orbit, referred to as valence electrons.

Which characteristic of an exothermic reaction differs from that of an endothermic reaction?

All chemical reactions involve the transfer of energy. Endothermic processes require an input of energy to proceed and are signified by a positive change in enthalpy. Exothermic processes release energy upon completion, and are signified by a negative change in enthalpy.

## Is mass or volume more precise?

Units of mass are inherently more accurate than units of volume because they mostly ignore confounding factors, like how tightly an ingredient is packed into a cup or what shape you’ve chopped it into.

Which method of determining volume is more accurate?

A graduated cylinder should be more accurate than a beaker.

### What makes an atom stable?

An atom is stable if the forces among the particles that makeup the nucleus are balanced. An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom’s nucleus may result from an excess of either neutrons or protons.

What are directly involved in forming bonds?

Bonds are formed when valence electrons, the electrons in the outermost electronic “shell” of an atom, interact. The nature of the interaction between the atoms depends on their relative electronegativity.

## Which electrons are most closely involved in bonding?

Key Concepts

• The electrons on the outermost energy level of the atom are called valence electrons.
• The valence electrons are involved in bonding one atom to another.
• The attraction of each atom’s nucleus for the valence electrons of the other atom pulls the atoms together.

What is the biggest difference between an exothermic and endothermic process?

An endothermic reaction occurs when energy is absorbed from the surroundings in the form of heat. Conversely, an exothermic reaction is one in which energy is released from the system into the surroundings.

### What is the biggest difference between an exothermic and endothermic process quizlet?

What’s the main difference between an exothermic and endothermic reaction? An exothermic reaction releases energy and feels warm while an endothermic reaction absorbs energy and feels cool.

Which method of determining density was the most precise?

Archimedes’s principle method is more accurate in the determination of the density.

## How to measure densities of solids?

In this lab, you will compare the accuracy and precision of densities of solids measured by two different techniques: volume displacement and volume calculation using calipers. Mass and linear measurements are basic units in the metric system. In chemistry, mass is measured in grams and length in centimeters.

What is the unit of density in chemistry?

Density is a measure of a substance’s mass-to-volume ratio. For liquids and solids, density is usually expressed in units of g/mL or g/cm3; these are equivalent since 1 mL is exactly equal to 1 cm3.

### How do you find the density of a Metal Slug?

3. Density is defined as mass/volume, and is usually expressed as g/mL (or g/cm3 in the metric system). Calculate the density for each metal slug in two ways: #1 by using the caliper measurements(units of g/cm3), and #2 by using the water displacement (units of g/mL). mass (in g)density =volume (in cm3 or mL)

What is the difference between mass and density?

Density is an intensive property, meaning it does not depend on the size of the object. A 1 mL sample of water, for example, has the same density as 1 gal of water. Mass and volume are extensive physical properties of matter, and vary with the size of the sample.