CHEMISTRY MIDDLE SCHOOL

Which organism is an herbivore?A.
grass

B.
bacterium

C.
spider

D.
grasshopper

Answers

Answer 1
Answer: Herbivores eat plants (producers) grass is a producer, spiders eat meat from bugs (carnivore) bacteria is idk. The answer is grasshopper because they eat plants.
Answer 2
Answer: answer is d. a grasshopper

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There are many sources of air pollution in the united states and around the world. Some are natural sources, and other come from human activities. Which of these examples is a natural source of air pollution?A.) car exhaust fumes
B.) methane gas from cow manure
C.) dust from fertilizers used on crops
D.) smoke from the burning of fossil fuels

Answers

B should be your best guess

Which of these was most important in forming the solar system A-darkness
B-evaporation
C-cooling
D-gravity

Answers

D. Gravity because the solar system wouldn’t stay together without the gravity pulling the planets together.

A car uses stored chemical energy in gasoline to move. The engine changes chemical energy into heat and ____ energy to power the car.light
sound
wind
mechanical

Answers

Mechanical energy. Otherwise potential into kinetic would work also.

mechanical energy is your answer :)

differentiate benzene and cyclohexane

Answers

• Benzene has the formula of C6H6 whereas cyclohexane has the formula of C6H12.

Benzene is an aromatic compound but cyclohexane is not aromatic.

Benzene is an unsaturated molecule, but cyclohexane is saturated.

Carbon atoms in the benzene ring have sp2 hybridization where carbon atoms in the cyclohexane have sp3 hybridization.
 
Benzene has a planar structure whereas cyclohexane has chair conformations.

Assume that each tablet's mass was 1,000 mg, and remember that you used 0.200 L of water each time. Compute the reaction rate to the nearest whole number using the formula below.

Answers

Answer:

For every temperature you use the formula given by the question.

at 3°C you have:

Reaction rate = (1000/0.2)/138.5 = 36 mg/L/sec

at 24°C you have:

Reaction rate = (1000/0.2)/34.2 = 146 mg/L/sec

at 40°C you have:

Reaction rate = (1000/0.2)/26.3 = 190 mg/L/sec

at 65°C you have:

Reaction rate = (1000/0.2)/14.2 = 352 mg/L/sec

Explanation:

Answer:

see below

Explanation:

3°C: 36

24°C: 146

40°C: 190

65°C: 352

Full table: 145

Eight pieces: 173

Tiny pieces: 216

What’s the molar mass of Lead-208

Answers

Lead is a basic metal and almost 11 isotopes of Lead are reported. The isotopes with greater natural abundance are as follow;

1) ²⁰⁸Pb with abundance 52.4 %

2) ²⁰⁶Pb with abundance 24.1 %

3) ²⁰⁷Pb with abundance 22.1 %

4) ²⁰⁴Pb with abundance 1.4 %

Molar mass of ²⁰⁸Pb:

Molar mass of any element is the total of number of protons, neutrons and electrons.
As, number of protons in Lead are 82 then in ²⁰⁸Pb isotope number of neutrons are...

# of Neutrons  =  M.mass - # of protons

# of Neutrons  =  208 - 82

# of Neutrons  =  126

Result:

Molecular Mass of Lead (²⁰⁸Pb) is 208 amu.

# of Protons in ²⁰⁸Pb  = 82

# of Neutrons in ²⁰⁸Pb = 126
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