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3 years ago

Describe the motion of molecules in an ice cube and in a radiator in winter

Chemistry

1 answer:

Sergio039 [100]3 years ago

7 0

Answer:

Molecules in an ice cube have lower kinetic energy than molecules in a radiator. Molecules in an ice cube move more slowly than molecules in a radiator. They collide with less force than molecules in a radiator.

Explanation:

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The use of fertilizers in agriculture has significantly altered several nutrient cycles including:

Lana71 [14]

Answer:

potassium, nitrogen and phosphorous cycle

Explanation:

A fertilizer is a substance which is applied on the plants by farmers to increase the supply of nutrients for the plants. Fertilizers have known to be toxic in many ways such as they alter the potassium, nitrogen and phosphorus cycles. Nitrogen, potassium and phosphorus are present in abundant amounts in the fertilizers. Draining of these fertilizers into rivers and ponds is toxic for the aquatic life. Hence, the use of fertilizers disrupts the natural cycles and is toxic for many aquatic plants and animals.

4 0

3 years ago

lead is a toxic metal that affects the central nervous system. a pbpb-contaminated water sample contains 0.0013 %pb%pb by mass.

Rus_ich [418]

0.0013% = 0.0013 g/100 ml water, or 1.3 mg/100 ml water

so for 145 mg, you need 145×100/1.3 = 11154 ml water or 11.154 L of water. Lead is a toxic metal that affects the central nervous system.

Extensively talking, the frightened gadget is organized into essential parts, the central nervous system(CNS) and the peripheral nervous system (PNS). The CNS is the processing center of the frame and includes the mind and the spinal cord. Both of these are protected through 3 layers of membranes referred to as meninges.

The principal anxious gadget is the frame's processing center. The brain controls most of the capabilities of the frame, inclusive of cognizance, movement, thinking, speech, and the five senses of seeing, listening to, feeling, tasting and smelling. The spinal twine is an extension of the mind.

The brain is what controls all the frame's features. The spinal twine runs from the brain down via the again. It carries threadlike nerves that department out to each organ and frame part. This network of nerves relays messages from side to side from the mind to distinctive parts of the body.

Learn more about central nervous system here:- brainly.com/question/2114466

#SPJ4

7 0

1 year ago

A 1.2516 gram sample of a mixture of caco3 and na2so4 was analyzed by dissolving the sample and completely precipitating the ca

Dennis_Churaev [7]

Answer:

0.009725 moles of H2C2O4

0.009725 moles CaCO3

Mass percentage = 77.77%

Explanation:

Step 1: The balanced equation

2MnO4- +5C2H2O4+6H+ →2Mn2+ +10CO2+8H2O

We can see that for 2 moles of Mno4- consumed , there is 5 moles of C2H2O4 needed and 6 moles H+ to produce 2 moles Mn2+, 10 moles of CO2 and 8 moles of H2O

Step 2: Calculate moles of MnO4-

Molarity = Moles/volume

Moles of Mno4- = Molarity of MnO4- * Volume of Mno4-

Moles of Mno4- = 0.1092M * 35.62 *10^-3 L

Moles of MnO4- = 0.00389 moles

Step 3: Calculate moles of H2C2O4

Since there is needed 5 moles of C2H2O4 to consume 2 moles of MnO4-

then for 0.00389 moles of MnO4-, there is 5/2 *0.00389 = 0.009725 moles of H2C2O4

Step 4: Calculate moles of CaCO3

moles of H2C2O4 = moles CaCO3, therefore, 0.009725 moles H2C2O4 = 0.009725 moles CaCO3

Step 5: Calculate mass of CaCO3

Molar mass of CaCO3 = 100.09 g/mole

Mass of CaCO3 = moles of CaCO3 * Molar mass of CaCO3

Mass of CaCO3 = 0.009725 moles * 100.09 g/mole = 0.9734 g

Step 6: Calculate percentage by weight of CaCO3

Mass of CaCO3 = 0.9734g

Mass of original sample = 1.2516g

Mass percentage = 0.9734/1.2516 *100% = 77.77%

6 0

3 years ago

1. What is the colour of FeSO4.7H20 crystals?How does this colour change upon heating? Give balanced

svet-max [94.6K]

1. What is the colour of FeSO4.7H20 crystals?How does this colour change upon heating?

Melanterite or FeSO4.7H20 is green in color
2FeSO4 ---> Fe2O3 + SO2 + SO3

2. a. What are redox reactions?
It is a type of chemical reaction that involves a transfer of electrons between two species.

b.Why is the reaction between MnO2 and HCl a
redox reaction?
Because there are atoms that are reduced and are oxidized.

c.Identify the substance oxidized and the
substance reduced in the above reaction.

MnO2 + 4 HCl ---> MnCl2 + 2H2O + Cl2
Mn was reduced and Cl was oxidized

5 0

3 years ago

Predict what might happen if the human body did not have specialized cells, tissues, organs, and organ systems to maintain homeo

bekas [8.4K]

We would be dead. No heart, brain or blood flow

3 0

2 years ago

Read 2 more answers