Recent questions in Chemistry

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What amount of Carbon-14 is left after 25,000 years? (Remember, you start with 100% of Carbon-14.)

Osahon asked Dec 15, 2024

by Osahon

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207k views

Determine the mass in grams of 2.90 x 10^21 atoms of chromium. (The mass of one mole of chromium is 52.00 g.)

Issachar asked Dec 15, 2024

by Issachar

7.9k points

1 answer

1 vote

149k views

Which of the following is an example of something that is made of cells? A flower A ball A sock A television

Raphael Amoedo asked Dec 15, 2024

by Raphael Amoedo

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5 votes

63.8k views

What is the mass percent of a solution prepared from 15 g of NaCl in 45 g of H₂O?

Feldur asked Dec 15, 2024

by Feldur

7.8k points

1 answer

2 votes

60.1k views

Acetylsalicylic acid is the active ingredient in aspirin. It took 35.17mL of 0.5065M NaOH to react completely with 3.210g of acetylsalicylic acid (which has one acidic hydrogen). What is the molar mass

Ryan Mills asked Dec 15, 2024

by Ryan Mills

8.2k points

1 answer

2 votes

185k views

What type of fingerprint would be left on a glass?

TalL asked Dec 15, 2024

by TalL

8.5k points

1 answer

3 votes

96.4k views

Fill in the blanks the sp² hybridized carbon atoms of alkenes and benzene rings are ____________ and absorb ____________ .

Fragmentedreality asked Dec 15, 2024

by Fragmentedreality

7.8k points

1 answer

5 votes

72.4k views

17. What kinds of rocks are oil deposits most commonly found in?

Schmop asked Dec 15, 2024

by Schmop

7.9k points

1 answer

3 votes

24.0k views

Which of the following gas samples have the greatest average molecular speed at 25°C? A) Kr B) CH₄ C) N₂ D) CH₂CI₂ E) CO₂

PVoLan asked Dec 15, 2024

by PVoLan

7.9k points

1 answer

2 votes

191k views

Explain ozone depletion resulting from CFC molecules in the air

Cyrilchampier asked Dec 15, 2024

by Cyrilchampier

8.1k points

1 answer

3 votes

221k views

What is the isotope notation for a nucleus with 56 protons and 117 nucleons?

Noiaverbale asked Dec 15, 2024

by Noiaverbale

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1 answer

5 votes

185k views

Describe the similarities and differences between glycogen and starch. a) Both are polysaccharides with alpha linkages b) Glycogen is found in plants, starch in animals c) Starch is branched, glycogen

Martijn Brouwer asked Dec 15, 2024

by Martijn Brouwer

8.2k points

1 answer

0 votes

93.1k views

Choose the aqueous solution with the lowest vapor pressure. These are all solutions of nonvolatile solutes, and you should assume ideal Van't Hoff factors where applicable. Options: a) 0.120 M C₂H₆O₂ b)

Gabriel Belingueres asked Dec 15, 2024

by Gabriel Belingueres

7.8k points

1 answer

1 vote

135k views

At equilibrium at 1200°C, [I2] = 9.5 ×10^(-2) m and [I] = 3.2 × 10^(-2) m. What is the value of Keq for this system? a. 3.4 × 10^(-1) b. 1.1 × 10^(-2) c. 1.1 d. 93

Cassius asked Dec 15, 2024

by Cassius

7.6k points

1 answer

1 vote

87.1k views

1. Calculate the number of moles in positive and negative ions in 2,25 moles of calcium fluoride (CaF). Show your work. 2. What is the mass in grams of 2.94 moles of lead(II) nitrate (Pb(NO))? Show your

Jlavallet asked Dec 15, 2024

by Jlavallet

8.0k points

1 answer

5 votes

113k views

What is the [H₃O⁺] of a solution with: a. pH = 8.37 b. pH = 1.55

Amr Elsehemy asked Dec 15, 2024

by Amr Elsehemy

8.3k points

1 answer

0 votes

118k views

Where are electrons released in an electromechanical cell? a. the anode b. the cathode c. the entire cell d. the salt bridge

Dmitry Pavlov asked Dec 15, 2024

by Dmitry Pavlov

9.0k points

2 answers

2 votes

16.8k views

Which event provides evidence that matter can reflect waves? A. An audience member covers her ears during a loud concert. B. A performer makes shadow puppets on a wall. C. A laser beam bounces off a series

Petmez asked Dec 15, 2024

by Petmez

8.1k points

1 answer

2 votes

118k views

The reaction CH₃–CH₂–NO₂+OH–→CH₃–CH–NO₂+H₂O obeys the rate law for pseudo first order kinetics in the presence of a large excess of hydroxide ion. If 1% of nitro ethane undergoes reaction in half a minute

Winton Hou asked Dec 15, 2024

by Winton Hou

8.7k points

1 answer

4 votes

28.7k views

Use valence bond theory to explain the bonding in F2, HF, and ClBr. Sketch the overlap of the atomic orbitals involved in the bonds. a) F₂: σ bond - head-on overlap of 2p orbitals; HF: σ bond - head-on

MLavrentyev asked Dec 15, 2024

by MLavrentyev

7.8k points

1 answer

0 votes

76.2k views

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