10.The Internet has been used as a rapid means to obtain information, including
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10.The Internet has been used as a rapid means to obtain information, including scientific ideas, but generally is less reliable than print media because A) at present, the Internet is less regulated than broadcast and print media. b) anyone can post scientific information, regardless of hether the information is misleading or not true. C) individuals and/or groups may post information to promote their own personal interests rather ideas that have been tested through the scientific process. D) All of the above are correct. 11.Which of the following characteristics applies to both living organisms and nonliving things? A) are made up of matter C) have the ability to store energy for later use B) are capable of reproduction D) are capable of growth E) are made up of cells 12. Which are the characteristics of living things only? A) Made up of cells B) Require energy and raw materials D)Respond to external environment AB)A-E C)Maintain homeostasis E) Grow and reproduce 13.Isotopes of an element have the samebut different A) number of electron shells, numbers of protons B) atomic number, atomic masses C) number of neutrons, numbers of protons D) atomic mass, atomic numbers E) name, chemical symbols 14. Which of the following is true regarding water? A) Each molecule of water consists of two atoms of hydrogen and one atom of oxygen covalently bonded to B) The oxygen side of the water molecule is partially positive. C) Water is a type of ion. D) Electrons are shared equally between the atoms of water E) Water molecules are attracted to each other by ionic bonds. 15. Which of the following is true concerning hydrogen bonds? A) They are weak bonds that form between water molecules in liquid form. B) The bonds break when water enters a vapor state and remain broken as long as water molecules remain in the gas phase. C) Hydrogen bonds hold strands of DNA together All of the above are correct. 16. Which of the following is a very important source of energy for cells? A) cellulose C) starch D) glucose E) ribose 17-22.Fill in the blanks [You can bubble two letters in your scantrons] A) electron E)lons B) proton AB) ionic bond C) covalent bond D) neutron 17. The nucleus of an atom is made up of and protons. 18. The atomic number of an element is the number of_which are positively charged. 19.Chemical bonds form when elements share, donate or accept 20form when atoms gain or lose electrons. 21.The bond that results in the sharing of electrons 22.The bond that forms between positive and negative ions as in table saltExplanation / Answer
10.- (d) all the above are correct.
because people on internet can copy other person work or write their own which is not a scientific approach. they can give any type of data and can say that they are scientific data from studies.
and today interent is less regualted anyone can make its own platform on various social mdia account and can give fake information very easily.
11.- (a)-are made up of matter.
as we known all the things are made up of small subatomic partical like proton,electron and neutron as our body is made by various combination of elements,proteins ,enzymes and all these are made up of atoms.
12.(d)- respond to external environment
apart of all the options this is the most important characteristic of living being because living things responds to change in light,heat ,sound and chemical.
on the other hand non living things can grow like a mountain and some couples are not able to reproduce but they are living being.
but no non living thing can response to external stimuli. therfore correct answer is (d)
13- (b)- atomic number,atomic masses
not all atoms of an element are identical-atoms of the same element can have different number of neutron. these different versions of the same elements are called isotopes.
isotopes are atoms with same number of proton but have a different number of neutrons.since the atomic number is equal to the numbers of protons and the atomic mass is the sum of protons and neutron.
14-(a)- each molecule of water consists of two atoms of hydrogen and one atom of oxygen covalently bonded to each other.
in water molecule ,two water molecules are bonded by hydrogen bond but the bond between two H-O bonds within a water molecule are covalent.
15-(d) all of the above are correct
hydrogen bond is a not a covalent or ionic bond it is just a weak bond between two molecules resulting from an electrostatic attarction between a proton in one molecule and an electronegative atom in the other.
in liquid state the molecules of water are held together by hydrogen bond as the liquid state changes into gas the bond disapper as in the gaseous state distance between the molecule gets increases.
16- (d) glucose
as all the cell abosorbs only glusose as a source of energy wether it is a plant cell or animal cell . and all the protiens fats ,etc finally breaks into glucose and cell absorbs glucose to form ATP for the functioning of cell. and cell also used to store glucose.
17- neutron
as we known all the things are made up of atoms and combiantions of atom and atom has two part a shell and a nucleus.
shell contains a electron which is continously revolves around nucleus and nucleus is made up of proton and neutron which contributes to the mass of atom.
18- proton
the number of protons in the nucleus of an atom,which is characteristic of a chemical element and determines its place in the periodic table.
19- electrons
chemical bonds are formed due to share, donate or accept of electrons which is negatively charged as electron is present in the shell so it can transfer from one molecules to other in chemical bond or can be shared between the two molecules in their orbitals.
20- ions
ions forms when atom gain or lose electron. since their is change is neutrality of atom as a result charge develop upon it. if a atom recives a electron so the element becomes negatively cherged or if it losses electron it will become positive.
ions are of two types i cations- positively charged species. ii-anions - negatively charged species.
21-is covalent bond
a covalent bond,is a chemical bond that involves the sharing of electron pairs between atoms.
22- ionic bond
the bond present in the table salt i.e(NaCl) is ionic bond.
ionic bond is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions,and is the primary interaction occuring in ionic bonds.
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