PHYSCI

Question 1

The theory that the universe began in a hot, dense state and has since expanded and cooled.

Answer 1

Big bang theory

Question 2

the process by which elements are formed within stars.

Answer 2

Stellar nucleosynthesis

Question 3

NOT a part of Nucleosynthesis

Answer 3

EXO nucleosynthesis

Question 4

Refers to the formation of the heavy elements by fusion of lighter nuclei within stars

Answer 4

Nuclear fusion

Question 5

the fundamental particles of all matter.

Answer 5

electron, proton, neutron

Question 6

The former are elements with atomic numbers beyond lawrencium 1(Z=103)whllett latter are synthetic elements with atomic numbers higher than that of uranium (Z=92)

Answer 6

transuranic elements and super heavy elements differ

Question 7

type of nuclear synthesis is believed to be the origin of the production of heavy elements

Answer 7

Supernova nucleosynthesis

Question 8

They have low surface tension

Answer 8

Non polar

Question 9

-It has linear shape

Answer 9

Carbon dioxide a non polar substance

Question 10

The presence of polar covalent bonds, The presence of non-polar covalent bonds, The shape of the molecule

Answer 10

factors determine the polarity of a molecule

Question 11

Zn+2HCI-> ZnCl + H₂

Answer 11

Increase the HCI concentration

Question 12

• It increases the number of effective collisions among reactants, thus increasing the reaction rate

Answer 12

effect of temperature rise in a chemical reaction

Question 13

NOT a represent ratio of the coefficients in a balanced chemical equation

Answer 13

Moles

Question 14

• In a chemical equation, the coefficients tell you the number of molecules of each reactant used, and the number of nuclear fusion

Answer 14

.refers to the formation of the heavy elements by fusion of lighter nuclei within stars
molecules of each product made.

Question 15

O²+Fe-> Fe² O³

Answer 15

unbalanced equations shows rust, Fe_{2}O_{3}, forming when oxygen, O_{2}, reacts with iron, Fe

Question 16

2 NaBr + 1 Cl² →

Answer 16

2 NaCl + 1 Br²

Question 17

factor cannot help to determine the limiting reactant

Answer 17

Pressure given

Question 18

The reactant that is used up first and prevents more product from being made.

Answer 18

Limiting reactant

Question 19

used to create methane and alcohol which are fuels useful in energy production and in powering automobiles

Answer 19

Biomass

Question 20

includes hydrocarbons such as coal, oil, and natural gas that comes from organic remains of prehistoric organisms

Answer 20

Fossil fuels

Question 21

is NOT the reason why we use solar thermal energy systems

Answer 21

the amount of sunlight varies depending on location, time of day, season of the year, and weather conditions

Question 22

Two most common types of biofuels

Answer 22

ethanol and biodiesel

Question 23

Hot water from hydrothermal vents is collected into a heat exchanger. The heat from the water is transferred to another fluid (e.g.isobutane) which evaporates and drives the turbines to generate electricity

Answer 23

Hydrothermal energy

Question 24

renewable energy sources can be harnessed all the time

Answer 24

Solar energy

Question 25

basic pH of a certain products.

Answer 25

Ph greater than 7

Question 26

compounds has no hydrogen

Answer 26

carbon tetrachloride-

Question 27

conversion of energyof pants to carry out.

Answer 27

Radiant to chemical

Question 28

contain only the elements carbon, hydrogen and oxygen

Answer 28

Carbohydrates and lipids

Question 29

Blueprint of life

Answer 29

DNA

Question 30

Fats

Answer 30

are solid at room temperature and contain saturated fatty acid.

Question 31

Oils

Answer 31

are liquid at room temperature and contain unsaturated fatty acids

Question 32

- It makes lower energy pathways available

Answer 32

catalyst can speed up a chemical reaction

Question 33

states that reacting substances must encounter enough activation energy and correct orientation

Answer 33

Collision

Question 34

The surface area of the reactants increases the number of collisions among particles increase surface area

Answer 34

rate of a chemical reaction increase

Question 35

intermolecular force exists between polar molecules

Answer 35

Dipole dipole

Question 36

if the electronegativity difference between 2 atoms is greater than 0.4 but less than 2.1

Answer 36

- covalent and polar

Question 37

Tend to attract one another

Answer 37

Polar molecules

Question 38

if Viscosity is higher, Solubility is greater

Answer 38

intermolecular forces of a molecule are stronger-

Question 39

Finding the central atom of a molecule, Determining the electron pair orientation using the total number of atoms

Answer 39

shape or molecular geometry of a substance using VSEPR-

Question 40

Attraction between an ion and a polar molecule

Answer 40

Ion dipole attraction

Question 41

It has zero net dipole moment.

Answer 41

H²S has a bent geometry

Question 42

NH, and H₂O

Answer 42

Hydrogen bond

Question 43

building block of protein

Answer 43

Amino acid

Question 44

Zn + 2HCl ---> ZnCl2 + H2

Answer 44

Increase the HCI concentration

Question 45

.

Answer 45

.

Question 46

Active ingredients of cleaning agents

Answer 46

Cleaning agents contain active ingredients such as surfactants, enzymes, solvents, acids, alkalis, bleaching agents, and fragrances. These ingredients work together to remove dirt, stains, and germs from surfaces, ensuring effective cleaning results. Understanding these active ingredients helps in choosing the right cleaning agent for specific cleaning tasks, maintaining cleanliness and hygiene in various environments.