Science!!

Science

100

Solution is..... A. chemical compound B. heterogeneous mixture C. homogeneous mixture D.colloid

Homogeneous mixture

200

Valence electrons determine an element's ______? A. electrical charge B. geographical properties C. chemical properties D. physical properties

chemical properties

300

Which of the following is a heterogeneous mixture? A. lava B. salt C. pure water D. sea water

lava

400

Atoms form chemical bonds by sharing _____ from one atom to another. A. nuclei B. protons C. valence electrons D. neutrons

valence electrons

500

How many total numbers of atoms are in a molecule of ammonium chloride? A. 3 B. 5 C. 9 D. 6

3 (NaCl)

Science

100

Homogenous mixtures have the same _____ and properties throughout the mixture. A. composition B. valence electrons C. atomic number D. disposition

composition

200

Electrons that are transferred from one atom to another cause both atoms to become_______. A. electrically dormant B. electrically crystallized C. electrically neutral D. electrically charged

electrically charged

300

The periodic table arranges elements according to _____. A. their atomic number B. their atomic mass C. when the element was discovered D. the letters of the element's chemical symbol

their atomic number

400

Molecules are the smallest unit of _____ that can stand alone. A. mineral B. isotope C. chemical D. matter

Matter

500

Mixtures are a combination of two or more substances that are _______. A. chemically combined B. physically combined C. theoretically combined D. none of the above

physically combined

Science

100

Ninety-eight percent of the Earth's crust is made up of ______ natural elements. A. ten B. eight C. six D. four

eight

200

An atom's atomic mass is the sum of its _______ A. electrons and neutrons B. protons and neutrons C. protons and ions D. electrons and protons

protons and neutrons

300

Subatomic particle: A. the weighed averages of the masses of an element's isotopes (naturally occurring isotopes of course) B. the tinier parts of an atom; protons, neutrons, and electrons C. neutral and human- made substances that cannot be broken down into simpler substances through chemical reactions D. classifying chart for natural and human-,and elements

the tinier parts of an atom; protons, neutrons, and electrons

400

isotope: A. a mixture where substances with the same make up and properties are uniformly blended throughout the mixture B.the attraction that is formed between atoms that share electrons C. atom of an element with the same number of protons but a different number of neutrons as the other atoms D. the number of protons and neutrons in an atom

atom of an element with the same number of protons but a different number of neutrons as the other atoms

500

Atomic number A. just like math, it is the chemical equations that have the same amount of atoms in each element on the left side as it does in that same element on the right side B. the number of protons in an atom's nucleus C. anything that takes up space and has mass D. the neutrally- charged subatomic particle

the number of protons in an atom's nucleus

Science

100

Atomic mass unit (amu): A. the number of protons and neutrons in an atom B. the sum of an atom's protons and neutrons; the best way to label atoms since they are too small to weigh in grams C. a mixture where substances with the same make up and properties are uniformly blended throughout the mixture D. what you use instead of grams when writing the mass of protons and neutrons

What you use instead of grams when writing the mass of protons and neutrons

200

molecule: A. the smallest unit of matter that can stand alone and keep all of a substance's chemical properties B. the attraction that is formed between two oppositely charged ions which happen when electrons are transferred from one atom or atom C. the fast moving electrons that swim around the nucleus of an atom D. the characteristics that tell you how substances react when put together with other substances

the smallest unit of matter that can stand alone and keep all of a substance's chemical properties

300

element: A. natural and human- made substances that cannot be broken down into simpler substances through chemical reactions B. the weighed averages of the masses of an element's isotopes (naturally occurring isotopes of course) C. the natural glue that holds atoms in molecules together D. the attraction that is formed between two oppositely charged ions which happen when electrons are transferred from one atom to another.

natural and human-made substances that cannot be broken down into simpler substances through chemical reactions

400

Solutions are classified as _____ mixtures because two or more substances are uniformly mixed throughout the mixture A. fibrous B. homogenous C. heterogenous D. gelatinous

homogenous

500

The periodic table arranges elements according to _______. A. their atomic mass B. their atomic number C. the letters of the element's chemical symbol D. when the element was discovered

their atomic number

Science

100

Neutrons are sub-atomic particles ____ A. which orbit the nucleus of the atom B. with a positive charge C. that make up most of the volume of atoms D. found in the nucleus of atoms E. with a negative charge

found in the nucleus of atoms

200

The number of ______ in the nucleus of the atom is equal to the atomic number. A. isotopes B. valence electrons C. neutrons D. ions E. protons

protons

300

An electrical attractions between two oppositely charged atoms or groups of atoms is referred to as a(n) _______ A. solution B. covalent bond C. mixture D. ionic bond

ionic bond

400

The needle of a compass points toward the ______. A. geographic North Pole B. geomagnetic North Pole C. either A or B D. neither A nor B

geometric North Pole

500

If you want to determine the meaning of symbols of a map, you study the _____. A. contour interval B. map legend C. map scale D. compass rose

map legend