CHEMISTRY HIGH SCHOOL

(02.03 LC)
What term is used to describe the lowest energy level of a particle? (5 points)

Answers

Answer 1
Answer:

Explanation:

Answer and Explanation: Photon is the basic unit of light. The excited state refers to the state when any specified electron gained some energy from surrounding. In the ground state, the electron carries no energy and this refers to its lowest energy level.

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Green plants use light from the sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas form aqueous glucose and oxygen gas. Calculate the molecules of water needed to produce ___ of oxygen. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.

Answers

Photosynthesis is the process in which green plants and some other organisms that makes use of the energy from the sun, converts carbon dioxide and water into glucose (a sugar) and oxygen.

Equation

6 CO2 + 6 H2O → C6H12O6 + 6 O2

The number of moles of oxygen that can be obtained from 25g of water is

= 25g/ 6( (2*1)+(16) )= 25/108

= 0.23mol

Therefore 0.23moles of water yields 0.23 moles of oxygen

No one's even answering, so i'll just uh leave this here

Answers

Answer:

answering what???

Explanation:

Answer:

I answered

Explanation:

If an ice cube melts at 0oC but water also freezes at 0oC, what is the difference between melting and freezing in terms of (a) the energy involved in the phase changes and (b) particles of the substances during the phase changes?

Answers

The energy involved in melting in freezing is heat, At 0 degrees Celsius ice is at an equilibrium where the heat energy absorbed during melting (endothermic) and heat energy dispersed during freezing (exothermic). When ice melts its absorbs heat energy to change states, when water freezes to ice it dispersed heat energy so that the particles can move slow enough to be almost frozen, but still very small vibrations throughout the ice. Particles in the frozen state are packed tightly and help together by a crystal lattice and IMF's, liquid is free flowing with free floating particles that can move freely from one another particle. 

Which of these processes indicates that smelting copper is a chemical changea)it involves melting copper to form liquid metal
b)it involves heating charcoal to high tempuratures
c)it involves drawing copper into long wires
d)it involves breaking molecular bonds between copper compounds

Answers

The correct answer is D:


it involves breaking molecular bonds between copper compounds .


The explanation :


-when we melt a copper it is a physical change because the substance is still copper and have the same shape.


- but for example Burning a copper it is a chemical change. Fire activates a chemical reaction between copper and oxygen.


-The oxygen in the air reacts with the copper and the chemical bonds are broken.


- the chemical change is changing the other compound bonded to the copper atoms.


So, the correct answer is D
Answer is d. The material can be phsycal changes into a differnt shape or state (gas, liquid, solid) and its will still be essentially copper. A chemical change is changing what other elements or compound is bonded to the copper atoms

The true color of water isa. clear.
b. greenish blue.
c. sky blue.
d. green. E. white.

Answers

a. clear.
Water is transparent. 

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.

Answers

If the pen is 10.5cm long, it is 0.105 meters. This can be worked out by considering that there are 100cm's in 1 meter, so you need to divide 10.5 by 100. You then move the decimal place 2 places to the right (because of the two zeros), which leads you to your answer of 0.105.

A pen measuring 10.5 cm long is equivalent to 0.105 meters.

Further Explanation

Length  

  • Length refers to a measurement of distance. It is the distance between two points.

S.I units  

  • The S.I. units of lengths. However, length can be measured using other units such as millimeters, centimeters, kilometers, etc.

Metric system unit of measurement  

  • It is a system of measurement that uses units such as gram, liter, and meter to measure mass, capacity and length respectively.
  • This system measures length based on meters, such that all the other units of lengths are based on an inter-conversion of units in meters.

Conversion of units measuring length

1 centimeter = 10 millimeters  

1 meter = 100 centimeters  

1 meter = 1000 millimeters  

1 kilometer = 1000 meters  

1 kilometer = 1000000 centimeters, and so forth.

Conversion of larger units to small units  

  • To convert larger units of measurement to smaller units we multiply we multiply the number of larger units by the appropriate conversion factor.

Conversion of smaller units to larger units

  • When converting smaller units of measurements to larger units of measurements we divide the number of smaller units by the appropriate factor.
  • For example, to convert cm to m, we divide the number of cm by 100.

In the question;

The pen measures 10.5 cm  

But, 1 meter = 100 centimeters

Thus;

10.5 cm will be equivalent to;

= 10.5 cm/100 cm  

= 0.105 meters

Therefore, a pen measuring 10.5 cm in length is equivalent to 0.105 meters.

Keywords: Length, meters, centimeters, metric unit system  

Learn more about:  

Level: Middle school  

Subject: Mathematics  

Topic: Metric system of measurements  

Sub-topic: Units of measuring length  
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