Science Texas

The Chemical symbol for nitrogen is

• Na

• Ni

• Ne

• N

The chemical symbol Ca represents

• chlorine

• cesium

• carbon

• calcium

Which of the following correctly represents an element?

• Water- H₂0

• Copper- Cu

• Carbon monoxide- CO

• Salt- NaCl

Tags

NGSS.MS-PS1-1

Which of the following do NOT describe an element?

1. A mixture of different chemicals
2. 2.Represented by a symbol that contains one uppercase letter
3. 3.Represented by a symbol that can contain a second uppercase letter
4. 4.Represented by a symbol that can contain a lower case letter
5. 5. A pure substance
6. 6. Can be identified using the periodic table

• 1 and 3

• 1,3 and 4

• 2,3,5, and 6

• 1 and 4

Which of the following is a compound

• Co

• Fe

• H

• CO

Tags

NGSS.MS-PS1-1

Which of the following substances is an element

• CO₂

• NaS

• Co

• KF

Which of the following statements are characteristics of a compound?

I. compounds are made from two or more elements.

II. A compound is a pure substance.

III. Compounds are represented by a chemical symbol.

IV. Compounds are represented by a chemical formula.

• I,III

• I,IV

• I,II,IV

• II,III,IV

Which of the following statements are characteristics of an element?

I. Elements are made from a mixture

II. An element is a pure substance.

III Elements are represented by a symbol.

IV. Elements make up matter on Earth.

• I,III

• I,IV

• II,IV

• II,III,IV

After an investigation, students were disposing of leftover substances. One student poured all of the liquids down the sink drain. A few seconds later, a white cloud formed above the sink, and the student's eyes began to burn.

Which statement accurately describes what caused this occurrence?

• The student did not wait two minutes in between pouring each liquid down the drain.

• The student did not allow water to run in the sink after pouring each liquid down the drain.

• A physical change occurred resulting in the formation of a new substance.

• A chemical change occurred resulting in the formation of a new substance.

Tags

NGSS.MS-PS1-2

Two liquids are mixed together. Which of the following does NOT identify the formation of a new substance?

• A gas is produced.

• One liquid dissolves into the other.

• The temperature changes.

• A solid is formed.

Tags

NGSS.MS-PS1-2