Recent questions in Chemistry

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A pastry taken from the oven with an internal temperature of 165°F is placed in a 35° refrigerator. After 10 minutes, the pastry has cooled to 150 degrees. If the pastry cannot be eaten until it has cooled

Pmqs asked Oct 15, 2024

by Pmqs

8.3k points

1 answer

4 votes

228k views

What effect did the new drying procedure have on the experimental yield?

Igor Luzhanov asked Oct 15, 2024

by Igor Luzhanov

8.1k points

1 answer

4 votes

118k views

A chemist weighed out 101. g of gallium. Calculate the number of moles of gallium she weighed out.

Amagrammer asked Oct 15, 2024

by Amagrammer

7.6k points

1 answer

1 vote

212k views

What has occurred if a test tube increases in temperature from a chemical reaction? O energy was created O energy was destroyed O energy was released (exothermic) O energy was absorbed (endothermic)

Mathter asked Oct 15, 2024

by Mathter

7.9k points

1 answer

4 votes

116k views

Which one or more of the following statements are true? (a) O₂ will effuse faster than Cl₂. (b) Effusion and diffusion are different names for the same (c) The higher the density of a gas, the shorter

Ozan BAYRAM asked Oct 15, 2024

by Ozan BAYRAM

8.4k points

1 answer

4 votes

128k views

How does the addition of heat to a substance at its melting point affect its average kinetic energy?

GlennS asked Oct 15, 2024

by GlennS

8.6k points

2 answers

5 votes

98.2k views

Which of the following are sustainable wastewater methods? I. Graywater used to water yards II. Chlorination and ozonation disinfection III. Use of artificial wetlands A. I only B. II only C. I and III

Robert Elwell asked Oct 15, 2024

by Robert Elwell

8.2k points

1 answer

3 votes

195k views

Which species would be considered a spectator ion based on the following equation? Ba₂⁺ + 2NO₃ + 2Na⁺ + SO₄²⁻ → BaSO₄(s) + 2NO₃ + 2Na⁺ a. Ba₂⁺ b. SO₄²⁺ c. BaSO₄ d. 2NO₃⁻

Aditya Srivastava asked Oct 15, 2024

by Aditya Srivastava

7.8k points

1 answer

5 votes

178k views

How can emulsion systems help bulk polymerisation?

Unix One asked Oct 15, 2024

by Unix One

7.7k points

1 answer

2 votes

211k views

Calculate the mass of butane needed to produce 50.0 g of carbon dioxide.

Vampire asked Oct 15, 2024

by Vampire

8.3k points

1 answer

5 votes

230k views

Find the percentage composition of each compound listed below. In the first ten problems, the correct formula is given. In the next four problems, laboratory data for the compound are presented. 1. FeO

KilledByCHeese asked Oct 15, 2024

by KilledByCHeese

8.0k points

1 answer

4 votes

84.8k views

Generally if a compound is a white chunky substance what type of compound is it? A) ionic B)covalent C)can’t tell

Lendrick asked Oct 15, 2024

by Lendrick

7.4k points

1 answer

2 votes

57.9k views

Where is mercury found in nature?

ThatsJustCheesy asked Oct 15, 2024

by ThatsJustCheesy

8.3k points

1 answer

3 votes

219k views

Alginate: Disinfection can be accomplished by ____.

Mosg asked Oct 15, 2024

by Mosg

7.9k points

1 answer

4 votes

77.4k views

10 grams of calcium-37 remain after 700 milliseconds (0.700 seconds). How much calcium was in the original sample? A) 40 grams B) 80 grams C) 20 grams D) 5 grams

Gwiazdorrr asked Oct 15, 2024

by Gwiazdorrr

8.1k points

1 answer

0 votes

74.0k views

When you have a negative ion of an atom, 0-2 for example, do you have a higher number of protons or electrons? a Number of protons b Number of electrons

Jim Wright asked Oct 15, 2024

by Jim Wright

7.8k points

1 answer

2 votes

134k views

One of the earliest researchers to explore the use of chemicals to kill microbial pathogens was? 1) Koch 2) Hooke 3) Fleming 4) Ehrlich

Traxium asked Oct 15, 2024

by Traxium

7.3k points

1 answer

4 votes

154k views

(15 pts!) Match the following items with the correct descriptions. 1. releases hydrogen ions two 2. accepts hydrogen ions eight 3. poor conductor of electricity base 4. shiny and lustrous acid 5. maximum

Andrew Lobban asked Oct 15, 2024

by Andrew Lobban

9.1k points

1 answer

0 votes

191k views

Which of the following is true about the atoms of the reactants and products in a chemical reaction? A) The atoms in the products have less mass than the reactants but keep the same arrangement. B) The

Edik asked Oct 15, 2024

by Edik

7.7k points

1 answer

0 votes

157k views

Which symbol represents the element that is least reactive with other elements? A) Li B) Fr C) Co D) As E) Rn

EJ Mak asked Oct 15, 2024

by EJ Mak

8.8k points

1 answer

0 votes

54.2k views

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