A polymer called polycarbonate is used to make lenses for safety goggles. Scientists use safety goggles to protect their eyes from exposure to dangerous materials in the lab. Safety goggles are hard and resistant to chemicals. Which microscopic properties likely make up polycarbonate?
metal layers surrounded by an electron cloud
metal layers surrounded by an electron cloud
crystals with atoms held together by ionic bonds
crystals with atoms held together by ionic bonds
long carbon chains cross-linked by covalent bonds
long carbon chains cross-linked by covalent bonds
large covalently bonded molecules cross-linked by hydrogen bonds
large covalently bonded molecules cross-linked by hydrogen bonds
Which describes a material that can conduct electricity? (1 point)
metal ions with positive charges attracted to each other
metal ions with positive charges attracted to each other
metal ions attracted to free-flowing electrons
metal ions attracted to free-flowing electrons
metal atoms and non-metal atoms with ionic bonds
metal atoms and non-metal atoms with ionic bonds
metal atoms covalently bonded to other metal atoms
Why does adding elements such as carbon to flexible metals make the material stronger? (1 point)
The added atoms can form ionic bonds with each other, which allows the metal atoms to slide back and forth easily.
The added atoms can form ionic bonds with each other, which allows the metal atoms to slide back and forth easily.
The added atoms can form ionic bonds with the metal atoms, which allows the metal atoms to slide back and forth easily.
The added atoms can form ionic bonds with the metal atoms, which allows the metal atoms to slide back and forth easily.
The added atoms can form covalent bonds with the metal atoms, which prevents the metal atoms from sliding back and forth easily.
The added atoms can form covalent bonds with the metal atoms, which prevents the metal atoms from sliding back and forth easily.
The added atoms can form covalent bonds with each other, which prevents the metal atoms from sliding back and forth easily.
A substance is made of positive and negative ions that are strongly attracted to each other. Which type of material is this, and what type of bonds are present? (1 point)
an ionic material with metal-metal bonds
an ionic material with metal-metal bonds
an ionic material with metal-metal bonds
an ionic material with metal-metal bonds
an ionic material with ionic bonds
an ionic material with ionic bonds
a metal with metal-metal bonds
Glass is made of silica, a polymer made of silicon and oxygen. Based on this information, what conclusions can be drawn about the properties of silica? (1 point)
Silica is a flexible polymer that does not have cross-linking between layers.
Silica is a flexible polymer that does not have cross-linking between layers.
Silica is a hard polymer that does not have cross-linking between layers.
Silica is a hard polymer that does not have cross-linking between layers.
Silica consists of ionically bonded atoms because silicon is a metal, and oxygen is a nonmetal.
Silica consists of ionically bonded atoms because silicon is a metal, and oxygen is a nonmetal.
Silica consists of covalently bonded atoms because silicon and oxygen are both nonmetals.
please help
15 answers