Recent questions in Chemistry

Question

When sugar dissolves in water in an open system, the mass is unchanged. When Alka-Seltzer is placed in water with a fizzing reaction in an open system, the mass becomes less. Explain how both can be correct,

Rahul Jangra asked Dec 21, 2024

by Rahul Jangra

8.5k points

1 answer

3 votes

231k views

In terms of ionization energy, which of these has the highest? A. Ca B. Al C. Cl D. Ne E. Ba

Pscl asked Dec 21, 2024

by Pscl

8.3k points

1 answer

5 votes

215k views

What force is it when there are no ions present, but there are polar molecules and H atoms are bonded to N, O, or F atoms?

Yatendra asked Dec 21, 2024

by Yatendra

8.8k points

1 answer

3 votes

220k views

Draw the lowest and highest energy conformers of 2,3-dimethylbutane.

Samir Kape asked Dec 21, 2024

by Samir Kape

7.5k points

1 answer

3 votes

159k views

Which conditions suggest that a bond will be covalent A. Atoms are both from the nonmetal groups. B. The difference in electronegativity between the two atoms is above 1.7. c. The difference in electronegativity

Jamex asked Dec 21, 2024

by Jamex

8.4k points

1 answer

5 votes

133k views

A 12.721 g piece of metal is submerged in boiling water for 5 minutes and then quickly transferred to a constant pressure calorimeter containing 40.0 mL of water at 22.7∘C. The final temperature of the

MaPo asked Dec 21, 2024

by MaPo

8.7k points

1 answer

2 votes

109k views

Which of the following has the greatest number of atoms? a) 1.0 mol He b) 0.60 mol H2 c) 20 g Potassium d) 8.5 mL H2O (density of H2O = 1 g/mL) e) 22.6 g KMnO4

Semenbari asked Dec 21, 2024

by Semenbari

8.5k points

1 answer

0 votes

223k views

2 C H2O + 1502 --> 10 CO2 + 12 H2O C Н 0

Jeroen Moors asked Dec 21, 2024

by Jeroen Moors

8.5k points

1 answer

3 votes

132k views

Calculate the amount of thermal energy required to increase the temperature 0f 25.0 g of silver from 50.0 c to 80.0

Raanan W asked Dec 21, 2024

by Raanan W

8.7k points

1 answer

0 votes

142k views

Use the information below to determine the volume and density of water. 1. Volume (mL) 20.2 mL 2. Mass of beaker 150.802 g 3. Mass of beaker + liquid 171.223 g

Zed asked Dec 21, 2024

by Zed

8.2k points

1 answer

3 votes

128k views

Based on molecular geometry, which of the following molecules could have net dipole moments if all bonds present were polar? A. CS_2 B. SeS_2 C. PCl_3 (P is the central atom) D. ClNO (N is the central

Yana asked Dec 21, 2024

by Yana

8.1k points

1 answer

3 votes

214k views

Calculate the value of the equilibrium constant, keq, for the reaction at 25°C.

Brainray asked Dec 21, 2024

by Brainray

7.6k points

1 answer

1 vote

224k views

How many CHO grams should you be taking in per day?

Duketwo asked Dec 21, 2024

by Duketwo

8.0k points

1 answer

4 votes

136k views

A chemical which supplies its own oxygen, and which helps other combustible materials burn more readily is ____________

Muhammed Shevil KP asked Dec 21, 2024

by Muhammed Shevil KP

8.0k points

1 answer

0 votes

180k views

A solution containing 10 mmol of CO₃²⁻ and 5.0 mmol of HCO₃⁻ is titrated with 1.4 MHCl. What volume of HCl must be added to reach the first equivalence point?

IDanil asked Dec 21, 2024

by IDanil

7.7k points

1 answer

4 votes

151k views

which of the following statements is incorrect?deviations from ideal gas behaviour are most significant at very high temperatures.for real gases, the observed pressure of a gas is usually lower than the

Barani R asked Dec 21, 2024

by Barani R

7.9k points

1 answer

4 votes

172k views

An aqueous buffer solution of volume 100 cm3 consists of 0.20 M CH₃COOH and 0.20 M NaCH₃CO₂. pKa value of CH₃COOH is 4.75. Predict the pH value of this solution.

Robbpriestley asked Dec 21, 2024

by Robbpriestley

8.2k points

1 answer

5 votes

129k views

What are the 4 colors of quartz?

Ty Savercool asked Dec 21, 2024

by Ty Savercool

7.6k points

1 answer

2 votes

6.4k views

x is used to obtain y which is used to remove permanent hardness of water what are salts like y generally known as ______

Borjab asked Dec 21, 2024

by Borjab

8.1k points

1 answer

1 vote

204k views

what micronutrient enhances non-heme iron absorption? a. copper b. potassium c. sodium d. vitamin c e. all of the above

Lashone asked Dec 21, 2024

by Lashone

8.4k points

1 answer

5 votes

45.4k views

Page:

« prev
1
...
85
86
87
88
89
90
91
...
1000
...
next »

Ask a Question

Recent questions in Chemistry

Other Questions