Chemistry College

To determine the density of an irregularly shaped object, a student immersed the object in 22.2 mL of water in a
graduated cylinder, causing the level of the water to rise to 37.8 ml. If the object had a mass of 22.4 g, what is the
density of the object?

Answers

Answer 1

Answer:

Explanation:

The density would be 4.

Related Questions

The small intestine is over 30 feet in length! Why do you think the small intestine is so long

Answers

because intestines are gross

Answer:

Explanation:

Better digestion!!

A teacher asks students to describe the physical properties of 10 mL of vinegar and 10 mL of milk. When the students finish listing the physical properties in their science notebooks, the teacher pours the vinegar and milk into the same beaker. The students are surprised to see a white solid substance form within the beaker as the two substances are combined.

What occurs within the beaker as the teacher mixes the vinegar and milk?
1. A chemical change that produces a precipitate
2. A physical change that creates a new substance
3. A physical change that produces a precipitate
4. A chemical change that produces no new substances

Answers

Answer:

1. A chemical change that produces a precipitate

Explanation:

A solid substance that is formed from a liquid phase is called a precipitate.

A reaction that produces a precipitate is called a precipitation reaction.

Precipitation reactions are an example of a chemical change.

Thus the correct answer is option 1: A precipitate was formed when vinegar and milk were mixed (as there were no solid substances when they were apart).

If 240.0 g NaOH reacts, how many grams of Cu(OH)2 should precipitate out in the reaction? Show work

Answers

Answer:

292.7 g

Explanation:

Note: the reaction is missing but I looked it up on the web and found it.

Step 1: Write the balanced equation

CuSO₄(aq) + 2 NaOH(aq) → Cu(OH)₂(s) + Na₂SO₄(aq)

Step 2: Calculate the moles corresponding to 240.0 g of NaOH

The molar mass of NaOH is 40.00 g/mol.

240.0 g × 1 mol/40.00 g = 6.000 mol

Step 3: Calculate the moles of Cu(OH)₂ formed from 6.000 moles of NaOH

The molar ratio of NaOH to Cu(OH)₂ is 2:1. The moles of Cu(OH)₂ formed are 1/2 × 6.000 mol = 3.000 mol.

Step 4: Calculate the mass corresponding to 3.000 moles of Cu(OH)₂

The molar mass of Cu(OH)₂ is 97.56 g/mol.

3.000 mol × 97.56 g/mol = 292.7 g

The enthalpy of combustion of gasoline (C8H18) is 5471 kJ mol-1. How much heat will be produced by burning 1 gallon of gasoline at 25°C? (Density of gasoline = 0.703 g/mL; 1gallon = 3.78 L) Show your work clearly.

Answers

Answer:

127529 KJ

Explanation:

Since 1gallon = 3.78 L= 3780 ml

The density of C8H18= 0.703 g/mL

Density = mass/volume

Mass= Density × volume

Mass= 0.703 g/mL × 3780 ml

Mass= 2657.34 g

Molar mass of C8H18= 114 g/mol

Number of moles= mass/molar mass

Number of moles= 2657.34/114

Number of moles= 23.31 moles

Since 1 mole evolved=5471 kJ

23.31 moles = 5471 kJ × 23.31 = 127529 KJ

1. What kinds of metals are REALLY reactive? why?
2. What kinds of non-metals are REALLY reactive? why?
3. What group on the periodic table doesn’t react at all? why?

Answers

Answer:

1. Alkali metals (group 1)

2. halogens (Group 17)

3. noble gasses (group 18)

Explanation:

1. alkali metals only have one valence electron meaning that they really want to lose that one valence electron to get a full octet.

2. halogens have 7 valence electrons meaning that they just need to gain 1 to get a full octet.

3. Nobel gasses already have a full octet meaning that they don't want to react. (atoms only react to get a full octet)

I hope this helps.  Let me know if anything is unclear.

Other Questions
Can somebody plz help me wit my work its due December 22.How did colonists use their knowledge of geography?How did other countries help?How did Washington show skilled leadership? Christinedans la salle de classe de Monsieur Dupont. HELP ILL GIVE BRAINLIEST AND POINTSFind the percent decrease. Where necessary round to the nearest tenth of a percent1. from 60 to 482. from 180 to 1083. from 64 to 244. from 6.5 to 4.85. The average cost of a gallon of gasoline was $1.29 in 1997 and $1.12 in 1998. Find the percent of decrease. Read the following excerpt from the article "Volunteers Count Every Street Tree in New York City." As you read, think about which statements are opinions and which ones are facts.Did you know? Over 80 percent of the U.S. population lives in cities or metropolitan areas, making urban trees more important than ever. Trees bring many benefits to human health--they filter air pollution, release oxygen, reduce mental stress, and absorb rainwater and noise. Trees in cities connect rural forests and parks to the urban landscape, creating habitat linkages for wildlife species like migratory birds. These are some of the many reasons the U.S. Forest Service supports trees in urban areas, and why the City of New York has been recruiting residents to count its trees for decades.Which of these statements is an opinion?a. "Trees in cities connect rural forests and parks to the urban landscape. . . ."b. "[U]rban trees [are] more important than ever."c. "Over 80 percent of the U.S. population lives in cities or metropolitan areas. . . ."d. "Trees bring many benefits to human health. . . ." Ton papa ________ intelligent. a. es b. est c. tes d. suis Line segment pq shown on the graph below, is rotated 90 counterclockwise about point q to form pq A student records the sexes and breeds of a dog in animal shelter. Which kind of data is the student recording Do all sociological studies on issues such as health conditions report thesame outcomes?A. Yes, because sociology is a precise scienceB. No, because it is the responsibility of sociologists to disproveestablished theoriesC. Yes, because sociologists are trained to view things from anobjective perspectiveD. No, because sometimes a sociologist's personal background willaffect the interpretation of the dataSUBMIT What is the slope of the line that passes through the points (a, b) and (c, b)? When someone donated 14 gallons of paint to Rosendale Elementary School, the fifth grade decided to paint a mural. They split the gallons equally among the four classes.b. how much paint will three classes use?c. If 4 students share a 30-square footwall equally, how many square feet of the wall will be painted by each student?d. what fraction of the wall will each student paint? What characteristic of the US government is drawn from Athenian democracy? The government is all powerful. The people run the government. The president runs the government. States govern themselves separately. What are the zeros of the function ILL GIVE BRAINLIST Question 6 of 10Which of these lines from "Service" most accurately indicates Jeff's basicpersonality?A. "Jeff was a self-proclaimed expert on everything, and the hero ofall his stories."B. "Jeff was restocking the milk refrigerator."C.""... tightening the rubber band around his greasy ponytail."D. "They were too afraid he'd stop telling them."SUBMIT What is the slop of a line that passes through (2,10) and (1,6) Which of the following is a property of metals?1. Olow melting point2. O good electrical conductor3. O good thermal insulator4. O cannot bend without breaking 20%= ?/50. What is the question mark?7/47/110/43/2 in your mouth, the food mixes with saliva and is mechanically broken into smaller pieces. We call this process Ill give brainliestAt Silver Gym, membership is $25 per month, and personal training sessions are $40 each. At Fit Factor, membership is $55 per month, and personal training sessions are $30 each. In one month, how many personal training sessions would Sarah have to buy to make the total cost at the two gyms equal? What check does the U.S. Senate have on the president?A appointing state judgesB. refusing to ratify treatiesC. Overriding presidential vetoesD. declaring laws unconstitutional Explain why the scientific process is important when learning about diseases