Chemistry DIA 1 Review Part 2

Chemistry DIA 1 Review Part 2

by William Hobson

​Scientific Process

• ​Observations

• ​Hypothesis

• ​Experimentation

• ​Results

• ​Conslusion

Experiments need to be:

• ​Designed based on observations, research, and evidence,

• ​Repeatable

• ​Controlled properly (test one variable).

Multiple Choice

A graduate student is designing an experiment to determine the effect of different fertilizers on a species of radishes. The scientist is using the same amount of water and sunlight for 4 plants of the same radish species, and she is using  different brand of common plant fertilizer. Which statement accurately describes the design of this experiment?

• The experimental control is the different brands of fertilizer; the independent variable is the amount of water and sunlight.

• The experimental controls include the amount of sunlight and water; the independent variable is the different brands of fertilizer.

• The dependent variable is the amount of water and sunlight' the independent variable is the brand of plant fertilizer used.

• The dependent variable is the brand of plant fertilizer used; the independent variable is the plant growth.

Multiple Choice

A scientist studying the hardness of a certain metallic compound. Which choice would best validate the data collected on the hardness of this metal?

• Share data with other researchers

• Repeatedly test the hardness of the metal when exposed to different kinds of aqueous solutions

• Test other properties of the metals other than hardness

• Measure the hardness of other substances

Multiple Choice

Convert the following number to scientific notation:  0.0000000495.

• 4.95 $$\times10^9$$  

• -4.95 $$\times10^{-8}$$  

• 4.95 $$\times10^{-8}$$  

• 49.5 $$\times10^{-9}$$  

Multiple Choice

Vegetable oil floats in water. Why?

• Vegetable oil is less dense than water.

• Vegetable oil is more dense than water.

• They both have the same density

• None of these

Multiple Choice

If an unknown solid object has a density of 6.00 g∕cm³, what is the density of each piece if the object is cut into three identical pieces?

• 2 g $$cm^3$$  

• 3 g/ $$cm^3$$  

• 6 g/ $$cm^3$$  

• 0.500 g/ $$cm^3$$  

Multiple Choice

Density is an intensive property of matter because it does not depend on the size or amount of a substance, but what a substance is made of.

• True

• False

Multiple Choice

An object has a density of 1.65g/cm³ and it is dropped in water, which has a known density of 1.00 g/mL. What will happen if you drop the object in water.

• It will float because it is more dense than water.

• It will sink because it is more dense than water.

• It will sink because it is less dense than water.

• It will float because it is less dense than water.

Multiple Choice

What lab equipment is needed to calculate the density of an irregular solid.

• gradiated cylinder, Bunsen burner, stopwatch 

• balance, Erlenmeyer flask, Bunsen burner

• balance, graduated cylinder, water

• stopwatch, beaker, triple-beam balance

Multiple Choice

Use the chart provided to calculate the mass of the salt.

• 48 g

• 50 g

• 2 g

• 52 g

Multiple Choice

An unkown sample of metal has a mass of 50 g and a volume of 19.2 cm³. Based on the information from the chart provided, identify the substance.

• Gallium

• Gold

• Iron

• Germanium

Multiple Choice

The density of a liquid was calculated to be 3.05 g/mL. You look up the density of this liquid and the actual density is 3.12 g/mL. What is the percent error?

• 2.4%

• 10%

• 12.1%

• 20%

Multiple Choice

You need to measure 4.5 mL of water. Which lab tool is better for this task?

• beaker because it is more accurate

• Erlenmeyer flask because it is more precise

• graduated cylinder because it is more precise

• burets because they are way cool

Multiple Choice

How would you describe this data if the accepted value is 30.45?

• Accurate but not precise

• Precise but not accurate

• High accuracy and high recision

• Neither accurate nor precise

Multiple Choice

How would you describe this data if the accepted value is 20. 

• accurate but not precise

• precise but not accurate

• High accuracy and high precision

• neither precise nor accurate

Multiple Choice

Use the image provided and the densities of each substance to determine where each liquid would be, from the bottom up, if you poured them into a graduated cylinder.

• C, B, A, D

• A, D, B, C

• D, A, B, C

• C, A, B, D