chem chapter 1-5 conceptual questions

gas (separated not touching; no fixed volume)

The molecules in this state of matter spread out until they fill the container and take on the size and shape of the container. The molecules are separated, not touching. Which state is it? a. liquid b. solid c. gas

Sulfur (S) and Copper (Cu)

Which of the following are a pure substances ? hint: a pure substance contains only one type of element or compound. It is not a mixture. A pure substance always has the same properties, no matter where you find it. A) cherry soda B) mayonnaise C) Jell-O desert D) gasoline E) sulfur F.) milk G) copper H.) flour I) olive oil

Dishwashing detergent

Which of the following is a mixture? A) sodium B) calcium C) dishwashing detergent D) water, H2O E) hydrochloric acid

hydrogen (H2)

Which of the following is a pure substance? A) seawater B) wood C) Hydrogen, H2 D) milk E) apple pie

A and C

Which of the following is a substance? A. Sodium hypochlorite B. Aqueous solution C. Selenium D. Milk

pure substance

Which of the following is not a state of matter? a. pure substance b. liquid c. gas d. solid

Plagiary

Which of these is not a step of the scientific method? Hypothesis Experiment Plagiary observing data

c

Which of these represents a physical change? a. milk turns sour b. sugar, when heated, becomes brown c.water, when heated, forms steam d. apples, when exposed to air, turn brown

A (A mixture CAN made from pure substance. Eg Water and Sugar)

Which statement is FALSE? a. A mixture can never be made out of pure substances b. A mixture is made of pure substances mixed together c. An element is one kind of pure substance d. A mix of salt, sugar and water is NOT a pure substance

C

A chemist is given an unknown sample. Which of her observations is not a physical property? A) The sample is a colorless liquid. B) The sample has an odor similar to gasoline. C) The sample is flammable. D) The sample size is 55 mL. E) The density of the liquid is 0.789 g/mL.

An educated guess

A hypothesis is observing data An Answer An Educated Guess An Experiment

B

All the following are characteristic properties of phosphorus. Which ONE is a chemical property? a. Red phosphorus and white phosphorus are solid forms of the element. b. When exposed to air, white phosphorus will combine with oxygen spontaneously to make a new kind of chemical, but red phosphorus will not. c. The white form is soluble in liquid carbon disulfide but is insoluble in water. d. The red form melts at about 600°C, and the white form melts at 44°C. e. The red form of phosphorus is insoluble in both water and carbon disulfide.

a teacup saucer (Moon is too big. Quarter is too small. Ice rinks are different, therefore unknown)

a circle has a diameter of 130mm. What has about the same radius? (Radius is half a diameter) Moon, quarter, teacup saucer, an ice rink

A

which is a chemical change? a. Copper reacts with chlorine to form copper (iii) b. tearing a balloon into a 100 pieces c. popping a balloon(did any new substance form) d. water boils at 100degree Celsius

cheese

which of the following is a mixture? calcium, sodium, cheese, water, hydrochloric acid