Which reason best explains why plasmas are good conductors of electricity? They have mobile charged particles. They are at extremely high temperatures. They are made up of particles in fixed positions. They have slow-moving nuclei that carry electricity.
A cubic meter is about the same as the volume occupied by a _____. basketball arena kilogram of water washing machine cup of milk
Which of these groups includes organisms that are MOST closely related? A) class B) family C) genus D) species
Fill in the Blank. 1. You want to be shielded from all three types of nuclear radiation. If you find shielding that blocks _________________ radiation, then it will most likely also block the other two types. 2. When nuclear radiation enters the tube of a Geiger counter, it ____________________ the atoms of the gas contained in the tube. 3. The particles that make up protons and neutrons and are thought to be basic units of matter are ____________________.
Which of the following metals will react with water to produce a metal hydroxide and hydrogen gas? Mg Li Al Pb
A single atom of an element has 21 neutrons, 20 electrons, and 20 protons. Which element is it? K Zr Ca Sc
Which one of the following substances is a liquid fuel used in rocket engines? a. Potassium perchlorate b. Liquid oxygen c. Ammonia d. Codium nitrate
Which of the following stars is the coolest? Sirius, a type A star Arcturus, a type K star Spica, a type B star Antares, a type M star
When molten rock undergoes crystallization above ground, what type of rock results? a. intrusive igneous rock b. extrusive igneous rock c. metamorphic rock d. sedimentary rock
A space probe identifies a new element in a sample collected from an asteroid. Successive ionization energies (in attojoules per atom) for the new element are shown below. I1 I2 I3 I4 I5 I6 I7 0.507 1.017 4.108 5.074 6.147 7.903 8.294 To what family of the periodic table does this new element probably belong? 1(1A) 2(2A) 13(3A) 14(4A) 15(5A) 16(6A) 17(7A) 18(8A)
Which changes can reach dynamic equilibrium? 1. nuclear changes, only 2. chemical changes, only 3. nuclear and physical changes 4. chemical and physical changes
Which of the following elements does not form a monatomic ion? A.potassium B.sulfur C.chlorine D.xenon
Choose the bond below that is most polar. choose the bond below that is most polar. h-cl h-br h-i c-h h-f
PLEASE HELP MEEEE!!!!!Which three statements about soil formation are true? - The composition of soil depends largely on the composition of the parent rock. - The chemical composition and structure of soil remains constant for millennia. - Soil becomes less fertile when it is mixed with decaying organic matter. - Strong roots of shrubs and trees hold on to soil and protect it from erosion. - Soil formed from local rock is residual soil, and soil formed from distant rock is transported soil.
The job outlook for physical therapists A) is weak to very poor. B) depends on the economy. C) will remain stable. D) will improve over time.
The formula of a compound indicates all of the following except: the symbols for the atoms the number of atoms the ratio of atoms in a compound the arrangement of the atoms in the molecule
Which of the following best describes a pair of elements that will form an ionic bond? C and H: Hydrogen easily loses electrons, and carbon gains them. Li and O: Oxygen easily loses electrons, and lithium gains them. P and Cl: Phosphorus easily loses electrons, and chlorine gains them. Ca and Br: Calcium easily loses electrons, and bromine gains them
Which of the following can be used to neutralize an ammonia (NH3) solution? (3 points) Question 5 options: 1) NaCl 2) H2O 3) HNO3 4) Ca(OH)2
The three men Crassus, Pompey, and Caesar joined together as a __________ to lead the empire. friends Senate Republic triumvirate