How Size Of An Atom Is Expressed

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introduction  chemistry

1. Heat is an energy transit that flows from _________________.

Ask: 1. Heat is an energy transit that flows from _________________.
A. hot object to cold object C. hot object to hotter object
B. cold object to hot object D. cooler object to cool object
2. As the temperature of a substance increases, atoms and molecules move
A. faster C. with medium speed
B. slower D. faster and then slower
3. What happens to the kinetic energy of atoms and molecules as the temperature
becomes lower?
A. increases C. decrease and then increase
B. decreases D. increases and then decreases
4. A security guard in a mall scanned the temperature of a girl using an infrared
thermometer. The registered temperature is 101 0F. If the normal body temperature
is below 37.50C, what does it show?
A. She has a fever. Her temperature is 38.3 0C.
B.She has a fever. Her temperature is 37.3 0C.
C.She does not have a fever. Her temperature is 38.3 0C.
D.She does not have a fever. Her temperature is 37.4 0C.
5. Which of the following statements is NOT true about heat?
A. Heat is expressed in terms of Joules or calories.
B.Heat is the average movement of molecules in a substance.
C. Heat pertains to the energy transferred when there is a difference in the
temperature of two bodies.
D.Heat is an energy that flows from substances with fast-moving molecules to other
substances with slow-moving molecules.
6. Which of the following is NOT an effect of heat?
A. The lowering of temperature
B. The rusting of the metal plate of a car
C. The increasing size of the metal gate
D.The subliming of naphthalene balls after some time.
City of Good Character 25
7. Which of the following requires heat loss to change the phase of an object?
A. Boiling of water C. Subliming of dry ice
B. Melting of butter D. Freezing an ice cream
8. When Linda was about to eat her soup, the online delivery arrives. She had to attend
to the delivery and left her food on the table for quite some time. What will most
likely happen to the temperature of her soup?
A. Nothing will happen because the temperature remains the same.
B. The food will become hotter as she lets her food expose to cooler surroundings.
C. The food will become colder than before and will meet thermal equilibrium with
the surroundings.
D. There are not enough details to answer this question.
9. In terms of temperature effects, why do we need to close the door of an airconditioned room?
A. The air inside the room might rush outside if the door is open.
B. The air outside the room might worsen the quality of the air inside.
C. The warm air inside the room might sink and the cooler air rises.
D. The air outside the room might increase the temperature of the cooler air inside
the room.
10. Which of the following will most likely happen if water in its liquid phase is boiled
at a very high temperature in several minutes?
A. The temperature will rise only.
B. The temperature will rise, and it will expand.
C. The temperature will rise, the water molecules will move faster, and it will change
into a gaseous state.
D. The temperature will rise, the water will expand, it will change into a gaseous
state, and, it will become colorless.
11. The boiling point of water on the Celsius scale is 100 0C. What is its equivalent in
the Kelvin scale?
A.0 K B. 2.73 K C. 173.15 K D. 373.15 K
12. The specific heat is defined as the quantity of heat required to change the
temperature of a unit mass of the substance by a Celsius degree. Which unit is
NOT for specific heat?
⁄ ∙ ℃ B.

∙ ℃ C.

⁄ D.

City of Good Character 26
13. Which of the materials listed below has the highest specific heat?
A. Lead B. Metal C. Water D. Silver
14. How much heat is needed to melt 0.25 kg butter in a pan from 2 0C to 40 0C?
(specific heat of butter is 2.04 kJ/ kg °C).
A.1.94 kJ B. 19. 38 kJ C. 193.8 kJ D. 1938 kJ
15. How much is the change in temperature of 2 kg aluminum can if 3000 J of heat is
applied to it? (Note: specific heat capacity of aluminum is 921.096 J/kg0C)
A. -1157.81 C0 B. 1157.81 C0 C. 0.61 C0 D. 1.63 C0

















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sana makatulong!

1.) How many elements are there in set A if

Ask: 1.) How many elements are there in set A if it is a set of letters from the word “misunderstanding”
2.) The Primary Subsets of the Set of Real Numbers is Irrational Numbers and____?
3.) Numbers ending in zeros are always a perfect square True OR False
4.) The square root of a number is a rational number, if and only if, the radicand is___?
5.) 7 + (-10)
6.) The approximate size of an atom of an element is said to be 7.4 x 10^(-11) m. Express this in standard (decimal) notation
7.) Division of fraction involves dividing the dividend by the reciprocal of the divisor, True Or False
8.) What is the LCD if 1/2 is added to 1/5
9.) The complement of a set is the set of elements from the universal set that are not in the given set
10.) If the principal root of a number is 5, what is the number?


1. True

2. True

3. False

4. True

5. True

6. False

7. True

8. True

9. False

10. True


Step-by-step explanation:

1. Which of the following activities causes respiratory and circulatory

Ask: 1. Which of the following activities causes respiratory and circulatory diseases?

A. eating nutritious food
C. eating cigarette
B. exercising
D. cigarette smoking

2. What activity can help you to prevent diseases in the respiratory and circulatory systems?
A. balanced diet
B. regular exercise
C. Adequate rest
D. all of the given choices

3. What happens to the diaphragm when a person breathes in?
A. The diaphragm contracts.
C. The diaphragm relaxes.
B. The diaphragm goes upward.
D. The diaphragm becomes bigger.

4. In what part of the respiratory system first enters the oxygen during inhalation? A. nose
B. nasal passages
C. trachea
D. esophagus

5. What is the correct equation that will show the function of the oxygen in the body?
A. CO2 + O2 = energy
C. O2 + energy = CO2
B. O2 + nutrients = energy
D. energy + nutrient = O2

6. The energy is stored in the .
A. cell
B. nutrients
C. water
D. oxygen

7. What type of blood circulation is described as the movement of blood through the tissues of the heart?
A. systemic circulation
C. coronary circulation
B. pulmonary circulation
D. none of the given choices

8. What should be the pulse after exercise? It becomes .
A. faster
B. slower
C. stop
D. nothing happens

9. The heart is a hollow muscular organ, about the size of your .
A. hand
B. arms
C. fist
D. tooth

10. How does singing from the diaphragm, instead of throat, help improve the voice quality of a singer?
A. Singing the diaphragm supports proper breathing and avoids voice straining.
B. The vibration of sounds while singing is in the diaphragm already instead of in the throat.
C. Because this was what coach Lea in the ‘The Voice Kids’ told her mentees.
D. None of the above.

11. DNA contains the genetic blueprint for making ___________.
A. proteins
B. atoms
C. energy

12. Which of the following is considered the basic unit of heredity?

13. Which structure in a cell are chromosomes be found?
A. cell membrane

14. What is the relationship among DNA, a gene, and a chromosome?
A. A chromosome contains hundreds of genes, which are composed of DNA. B. A chromosome contains hundreds of genes, which are composed of protein.
C. A gene contains hundreds of chromosomes, which are composed of protein.
D. A gene is composed of DNA, but there is no relationship to a chromosome.

15. Describe the location of genes in chromosomes?
A. The genes on each chromosome are arranged in a particular sequence.
B. Each gene has a particular location on the chromosome called its locus.
C. Many genes are located in the chromosome which is made of DNA.
D. All of the above

16. The location of a particular gene on a chromosome is in the ______?
B. q arm
C. genetic locus
D. nucleus

17. Which of the following theories does NOT explain the chromosomal basis of inheritance?
A. Genes are located in the chromosomes. B. Chromosomes and their related genes undergo segregation during meiosis C. Mendel’s laws of inheritance do not relate to the behavior of chromosomes in meiosis.
D. Chromosomes and their related genes undergo independent assortment in the formation of gametes.

18. A type of chromosome pair that has similar structure and shape and has genes that codes for proteins which expresses the same trait.
A. Heterozygous chromosome C. Homologous chromosome
B. Homozygous genes.
D. Inheritance trait

19. Which sequence of DNA bases would pair with this partial strand: ATG TGA CAG?

20. The part of the nucleotide that contains the “genetic code.”
A. deoxyribose sugar C. phosphate group
D. nitrogenous bases

FYI seryosong sagot. Kaya malaking points binigay ko. Kc seryoso Din yung mga cnasagot ko sa tanong nyo. ​


1. A



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MULTIPLE CHOICEDirections: Read carefully then choose which letter would be


Directions: Read carefully then choose which letter would be the best answer. Put only the letter on the space provided before each number.

_______1. What conditions must be met in order for a chemical reaction to occur?

A. Collision with proper orientation
B. Sufficient activation energy
C. Adding more reactant particles
D. Both collision with proper orientation and sufficient energy

_______2. Which of the following would NOT increase the rate of reaction?

A. Increasing the temperature
B. Adding catalyst
C. Increasing the volume
D. Increasing the concentrations

_______3. Suppose you dissolve Zinc (Zn) in Hydrochloric acid (HCI) and add more acid than usual. Then drop pieces of Zinc. What factor does NOT affect the rate of the reaction?

A. Surface area of the Zinc
B. Concentration of the reactant
C. Temperature of the solution
D. Amount of Hydrochloric acid

_______4. Activation energy is the amount of energy required to

A. Break the bonds between the reacting molecules
B. Make the reacting particles collide
C. Form the bonds between the product molecules D. Convert the reactant to a single product

_______5. Why does a candle burn rnore rapidly when placed in an open jar than in air?
What accounts for this reaction?

A. Higher Oxygen concentration
B. Greater surface area of the jar
C. Increasing the surrounding temperature
D. Length of the candle

_______6. A chemical change that occurs when two or more substances combine to form a new substance.

A. Activation Energy
B. Chemical Kinetics
C. Chemical Reaction
D. Product

_______7. The measure of the change in the concentration of the reactants or product.

A. Activation Energy
B. Activation rate
C. Chemical Reaction
D. Concentration

_______8. The substance or particles that enter into and is altered in the course of a chemical reaction.

A. Catalyst
B. Enzyme
C. Product
D. Reactant

_______9. The number of particles present in a given volume of solution.

A. Catalyst
B. Concentration
C. Product
D. Temperature

_______ 10. The measure Of how fast or slow a reaction happens.

A. Activation Energy
B. Collision theory
C. Particle Size
D. Rate of Reaction

_______ 11. Condition that needs to be met for a chemical reaction to cccur.

A. Substance must be homogeneous.
B. Temperature should be kept constant.
C. Particles should maintain a certain distance to each other.
D. Particles in the substance must collide and have enough energy.

_______ 12. The factor that would NOT affect the rate of chemical reaction.

A. Concentration
B. Humidity
C. Particle Size
D. Temperature

_______13. The factor that will slow down the rate of chemical reaction.

A. Manual stirring of the substance.
B. Placing substance in a hot water.
C. Placing products in iced water.
D. Placing reactants in ice bath.

_______ 14. The factor that does NOT show evidence of chemical reaction.

A. Absorption of heat
B. Change of color
C. Change of size
D. Liberation of heat.

_______15. The measure of the hotness or coldness of a substance

A. Energy
B. Humidity
C. Temperature
D. Thermometer

_______16. The substance formed as a result of a chemical reaction.

A. Product B. Reactant C. Resistance D. Substrate

________17. The measure of how much exposed area a solid object has, expressed in square units.

A. Volume B. Surface C. Surface Area D. Concentration

_________18. The substance that is dissolved in a solution.

A. Solid B. Solute C. Solvent D. Substance

________19. The component of a solution that is present in the geatest amount.

A. Sample B. Solute C. Solvent D. Substance

________20. A form of matter that has definite composition and distinct characteristics.

A. Atoms B. Compound C. Mixture D. Substance


  1. D.
  2. A.
  3. A.
  4. A.
  5. C.
  6. B.
  7. B.
  8. C.
  9. B
  10. D.
  11. C.
  12. B.
  13. A.
  14. C.
  15. C.
  16. C.
  17. B.
  18. C.
  19. A.
  20. B.


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how do we express the size of an atom​

Ask: how do we express the size of an atom​

The Angstrom is widely used in physics, chemistry and biology to express the sizes of atoms, molecules, and the electromagnetic wavelengths.

Not only you can get the answer of how size of an atom is expressed, you could also find the answers of 1. Which of, MULTIPLE CHOICEDirections: Read, 1. Heat is, how do we, and 1.) How many.