Can someone list the observable changes that indicate a physical change has occurred? Same for chemical change?
Answers
Related Questions
For each cycle,explain how humans actions have altered or disrupted the cyclewater cycle: carbon cycle: nitrogen cycle:
Which methods will help you properly identify pH with indicator paper? Check all that apply. Set a piece of pH paper in front of each solution before testing to keep organized. Dip the pH paper into each test tube and lay it on the table to let it change color. Use a transfer pipet to remove a few drops from the solution to drop onto the paper. Wait a minute or so before reading color. Use the same piece of indicator paper for each solution to conserve paper.
Zinc metal reacts with hydrochloric acid (HCl) to produce hydrogen gas. What best describes this reaction? A single replacement reaction takes place because zinc is more reactive than hydrogen. A single replacement reaction takes place because zinc is more reactive than chlorine. A double replacement reaction takes place because zinc is less reactive than hydrogen. A double replacement reaction takes place because zinc is less reactive than chlorine.
True or False A single replacement reaction is a reaction in which one element replaces a similar element within a compound
Answers
smallest to largest: epoch, period, era, eon
Answers
Alkanes only have single bonds
Final answer:
Alkanes are hydrocarbons with only single bonds between the carbon atoms, therefore, they do not contain any double bonds.
Explanation:
In chemistry, an alkane is a type of hydrocarbon where all of the carbon-carbon bonds are single bonds, meaning they share just one pair of electrons. Double bonds share two pairs of electrons and are typically found in alkenes, a different type of hydrocarbon. Therefore, an alkane does not have any double bonds.
Learn more about Alkanes here:
#SPJ6
Answers
Use dimensional analysis to find the number of cm/min in 5.8 m/hr. Show your work. Be sure to calculate the answer in the correct number of significant figures.
Answers
Answer:
Explanation:
Q1. For assuring accuracy and precision we have to take into account statistical values such as absolut error, relative error and standard deviation. Errors(absolute and relative) are related to accuracy, and they tell you how much you are getting away from the correct answer. Standard deviation tells you how precisa your measure was, that means how many times you hit on the objective.
standard deviation can be added to the result as
Q2.
Q1: sort your numbers into numerical order so you can determine the highest and lowest measured values. and then subtract the lowest measured value from the highest measured value. Now determine that the answer is the precision.
Q2: In one meter there are 100 centemeter. Now you got 5.8 miles per hour which will become 580 centemeter per hour. In addition, there are 60 minutes in an hour. Based on what we know, 580 centemeters per hour will and should become 580/60 cm/min
Answers
B. R
C. O
D. C
Answers
Answer:
B. R
Explanation:
A layer of partially weathered or unweathered rock is present in R soil horizon
Answer: Option (B)
Explanation: The R-layer represents the unweathered rocks that are located below the surface and is the lowest layer in the soil profile. Here, hard rocks are found which are difficult to break, and are breakable with heavy machineries only. This R-layer makes the foundation of the soil profile that supports the entire overlying series of layers.
Thus, the correct answer is option (B).