Hot Student Stories

Chemistry

Which term refers to the speed at which reactants are converted into products? A) reaction rate B) activation energy C) meta stable state D) spontaneous reaction

Megan Page

follow
followin
1 answer
5 views

Which choice is a pair of isomers? view available hint(s) which choice is a pair of isomers? ch3ch2ch2ch3 and ch3ch(ch3)2 ncch3 and ch3cn ch3oh and ch3och3 1-pentene and 2-methylbutane butanol and propene?

Carlton Burgess

follow
followin
1 answer
9 views

We dissolve 2.45 g of sugar in 200.0 g water. what is the mass percent of sugar in the solution?

Zach Chandler

follow
followin
1 answer
5 views

Rust forms when _____ reacts with chemicals in rocks.

William Cain

follow
followin
1 answer
5 views

How many covalent bonds does hydrogen form if each of its unpaired electrons participate in one bond?

Justin Parker

follow
followin
1 answer
5 views

2H2 + O2 --> 2H2O can be classified as what type of reaction? A. Both synthesis and combustion. B. Only synthesis. C. Only combustion. D. It cannot be classified.

Kristi Hammond

follow
followin
1 answer
0 views

What is the formula for copper(ii) phosphate? capitalization and punctuation count!?

Brandon Scott

follow
followin
1 answer
4 views

For work to be accomplished we must have (2 points) a)an action which causes movement and an opposite reaction. b)an action which causes no movement or reaction. c)a force and a movement in the opposite direction of the force. d)a force and a movement in the same direction as the force.

Daniel King

follow
followin
1 answer
5 views

Which pair below describes isotopes of the same element? A) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons B) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons C) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons D) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons

Kristi Hammond

follow
followin
1 answer
6 views

Which solution has the lowest pH? A. 1.0 M HNO2 B. 1.0 M CH3COOH C. 1.0 M HCOOH D. 1.0 M HNO3 E. 1.0 M HPO4–

Amanda Johnson

follow
followin
1 answer
7 views

Make the following conversion. 420 hg = _____ cg 4200000 420000 0.0420 0.00420

Roger Moore

follow
followin
1 answer
13 views

The Ring of Fire is a major belt of volcanic activity circling the Pacific Ocean. true or false

Brandon Scott

follow
followin
1 answer
6 views

A sample of water is being heated over a flame. What happens to the water as it is heated? Select one: a. The volume of the water decreases. b. The water undergoes an endothermic reaction. c. The kinetic energy of the water molecules increases. d. The velocity of the water molecules begins to decrease.

Samantha Barber

follow
followin
1 answer
5 views

The letter "p" in the symbol 4p3 indicates the ____ A spin of an electron. B orbital shape. C principle energy level. D speed of an electron.

Ralph Lopez

follow
followin
1 answer
8 views

Which statement describes the periodic law? Metals are both good conductors of heat and electricity. Atomic masses always increase across a period. Nonmetals are of the most reactive elements. Elements in the same group have similar chemical properties.

Ramon Kelly

follow
followin
1 answer
5 views

Part a how many milliliters of liquid does the smaller graduated cylinder contain? express your answer in milliliters using the proper number of significant figures.

Nicholas Rivera

follow
followin
1 answer
5 views

Which statement about subatomic particles is NOT true? A. Protons and neutrons have almost the same mass. B. Protons and electrons have opposite charges. C. Unlike protons and electrons, neutrons have no charge. D. Protons and neutrons have the same charge.

Ashley Howard

follow
followin
1 answer
5 views

The brackets are indicating a(n) _____ bond. the brackets are indicating a(n) _____ bond. hydrogen polar covalent single (nonpolar) covalent hydrophobic ionic

Timothy Norman

follow
followin
1 answer
5 views

Which type of plate boundary would be most likely to lead to above-ground volcanic activity?

Jennifer Patterson

follow
followin
1 answer
5 views

Which quantity is equivalent to 39 grams of LiF?

Jeffrey Rodriguez

follow
followin
1 answer
5 views

Why is nonpoint source pollution potentially more harmful than point source pollution?a.Nonpoint source pollution disrupts the water cycle.b.Nonpoint source pollution is difficult to regulate.c.Nonpoint source pollution comes from more than one source.d.Nonpoint source pollution is more damaging to living organisms than point source pollution

Daniel King

follow
followin
1 answer
9 views

Food travels directly from the stomach to the

Curtis Rhodes

follow
followin
1 answer
1 view

Which laws can be combined to form the ideal gas law? Boyle’s law and Charles’s law Gay-Lussac’s law and Avogadro’s law Charles’s law, Avogadro’s law, and Boyle’s law Dalton’s law, Gay-Lussac’s law, and Avogadro’s law

Justin Parker

follow
followin
1 answer
7 views

During any type of mineral growth, atoms accumulate on _______.

Theresa Perry

follow
followin
1 answer
8 views

It is best to say the efficient plumbing _______. A. Reduces water pollution by using less water. B. Reduces water pollution by using cleaner water. C. Increases water pollution by using more water D. Reduces water pollution by using dirty water.

Theresa Perry

follow
followin
1 answer
23 views

What is the pressure of 0.540 mol of an ideal gas at 35.5 L and 223 K? Use mc031-1.jpg and mc031-2.jpg. 0.715 kPa 2.45 kPa 28.2 kPa 62.7 kPa

Jodi Brooks

follow
followin
1 answer
16 views

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will. . A. remain stable.. . B. change into a different element altogether.. . C. emit neutral particles and no energy.. . D. none of the above

Carlton Burgess

follow
followin
1 answer
5 views

Explain how the concept of the “survival of the fittest” relates to the theory of evolution.

Ross Pratt

follow
followin
1 answer
5 views

Which category does the ion PO43- belong to?

Kevin Sutter

follow
followin
1 answer
6 views

If the ka of a monoprotic weak acid is 1.2 × 10-6, what is the ph of a 0.23 m solution of this acid?

Carlton Burgess

follow
followin
1 answer
5 views

The molecular mass of the compound is 90 amu. What is the molecular formula for C2H5O?

Jeffrey Rodriguez

follow
followin
1 answer
24 views

Elements that are characterized by the filling of p orbitals are classified as _____. a. Groups 3A through 8A b. transition metals c. inner transition metals d. groups 1A and 2A

Theresa Perry

follow
followin
1 answer
7 views

Which of the following is the most direct method for combating rainforest deforestation? a. ecotourism b. carbon credits c. rehabilitation d. education

Kevin Sutter

follow
followin
1 answer
5 views

Tetraphosphorus decaiodide is represented by which formula? A) P3I10 B) P4I10 C) P3I8 D) P4I8

Kyle Mckinney

follow
followin
1 answer
15 views

Which of the following has the greatest heat capacity? a. 1,000 g of water b. 1,000 g of steel c. 1 g of water d. 1 g of steel

Curtis Rhodes

follow
followin
1 answer
5 views

Which type of chemical reaction occurs in C6H12 + 9O2 mc031-1.jpg 6CO2 + 6H2O?

Ross Pratt

follow
followin
1 answer
12 views

Write the complete balanced equation for the reaction between AlF3 and CaO.

Zach Chandler

follow
followin
1 answer
5 views

Which of the following formulas represents an ionic compound? A.)CS2 B.)Bal2 C.) N2O4 D.) PCI3

Mindee Nelson

follow
followin
1 answer
5 views

Which of the following accurately describes the pH scale? A. The greater the concentration of hydroxide ions, the higher the acidity is.B. The greater the pH is, the lower the acidity is.C. The lower the pH is, the more basic the solution is.D. The lower the concentration of hydrogen ions, the higher the acidity is

Alexa Spicer

follow
followin
1 answer
6 views

Complete the ka1 expression for h2co3 in an aqueous solution.

Dana Keller

follow
followin
1 answer
50 views

The amount of the lighted side of the moon you can see is the same during a. new moon and full moon phase. b. new moon and first quarter phase. c. first quarter and third quarter phase. d. full moon and third quarter phase.

Mindee Nelson

follow
followin
1 answer
4 views

Calculating Lattice Energy? Someone explain please!? 1. Given the following thermodynamic data, calculate the lattice energy of CaBr2(s). Term Value ( kJ/mol) Delta {H}f[Ca(g)] 179

James Washington

follow
followin
1 answer
13 views

Write a balanced chemical equation for the reaction. na2co3 and agno3

Tara Andrews

follow
followin
1 answer
19 views

Write the formula for a complex formed between ni2 and nh3, with a coordination number of 5.

Jennifer Patterson

follow
followin
1 answer
5 views

Which reaction occurs spontaneously? (1) Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq) (2) Cl2(g) + 2NaF(aq)--> F2(g) + 2NaCl(aq) (3) I2(s) + 2NaBr(aq)--> Br2(l) + 2NaI(aq) (4) I2(s) + 2NaF(aq)--> F2(g) + 2NaI(aq)

Karen Wright

follow
followin
1 answer
5 views

How many moles of pcl3 contain 3.68 × 1025 chlorine atoms?

Kaitlin Dean

follow
followin
1 answer
5 views

If a shell can hold a maximum of 32 electrons what is the value of n?

James Washington

follow
followin
1 answer
0 views

The mass number of Fe2+ is 56. How many neutrons are there in a single Fe2+ atom?

Ashley Howard

follow
followin
1 answer
6 views

Which is true about sugar dissolving in water? • sugar is the solute, and water is the solvent. • both sugar, and water are solutes • both sugar, and water are solvents • sugar is the solvent, and water is the solute

Brandon Scott

follow
followin
1 answer
5 views