At STP which sample contains the same amount of molecules as 3.0 liters of H2 (g)?1.5 L of NH3 (g)2.0 L of CO2 (g)3.0 L of CH4 (g)6.0 L of N2 (g)
Oxygen constantly diffuses from air or water into an animal's bloodstream. For this to happen, the concentration of oxygen in the blood must be (1 point). .A. -greater than the concentration of oxygen in the air or water.. B.-greater than the concentration of carbon dioxide in the air or water.. C.-lower than the concentration of oxygen in the air or water.. D.-lower than the concentration of carbon dioxide in the air or water.
3 During a flame test, a lithium salt produces a characteristic red flame. This red color is produced when electrons in excited lithium atoms (1) are lost by the atoms (2) are gained by the atoms (3) return to lower energy states within the atoms (4) move to higher energy states within the atoms
What are ionic compounds typically composed of? a metal anion and a nonmetal cation two metal anions a metal cation and a nonmetal anion two nonmetal cations
Which statement defines calorimeter? a device that measures the heat that is gained or lost in a chemical change a device that measures the potential energy of an element a device that is used to measure heat capacity a device that is used to measure temperature
The repeating pattern of a mineral’s particles forms a solid called a(n) a. crystal. b. element. c. compound. d. rock.
Why should carbonated beverages be kept cold? A).Decreased temperature keeps gases like carbon dioxide dissolved. B).Decreased surface area keeps gases like carbon dioxide dissolved. C).Increased agitation keeps gases like carbon dioxide dissolved. D).Decreased surface area keeps gases like carbon dioxide dissolved. E).There is no benefit to keeping the beverage cold.
Most plants and all animals depend on _____ to meet their need for nitrogen. lightning strikes denitrifying bacteria bacteria that break apart cellulose nitrogen-fixing bacteria
Oversteepened slopes often lead to mass movements because A. the angle of their slope is between 50 and 60 degrees. B. plants cannot grow on them. C. the angle of their slope is less than 50 degrees. D. the angle of their slope is greater than 40 degrees.
On Earth, when a body is in motion, there is always __________ to oppose the motion. a. friction c. gravity b. inertia d. acceleration
The rock record indicates that photosynthesis began on Earth about 3.5 million years ago. a. True b. False
Which of the following will not have the same number of valence electrons? carbon silicon lead bismuth
What is the net ionic equation of the reaction of BeCl2 with NaOH? Express your answer as a chemical equation. I have an answer, but everytime I enter it it says invalid format.. :/
At which temperature is the vapor pressure of ethanol equal to 80. kPa?(1) 48°C (3) 80. °C(2) 73°C (4) 101 °C
Classify each process as an endothermic or exothermic process. drag the appropriate items to their respective bins. helpreset exothermic breaking solvent-solvent attractionsbreaking solute-solute attractions endothermic forming solute-solvent attractions
Which is the next logical step in balancing the given equation? CS2(l) + Cl2(g) CCl4(l) + S2Cl2(l) A.) Place the coefficient 2 in front of sulfur dichloride (S2Cl2). B.)Place the coefficient 3 in front of the chlorine molecule. C.)Leave the equation alone as it is already balanced. D.) Place the coefficient 4 in front of carbon disulfide(CS2). E.)Place the coefficient 2 in front of carbon tetrachloride(CCl4).
Iron reacts with oxygen in a chemical hand-warmer. How should this reaction be categorized? A. as an exothermic process because it releases heat B. as an endothermic process because it releases heat C. as an exothermic process because it absorbs heat D. as an endothermic process because it absorbs heat
Which statement best describes electrons?(1) They are positive subatomic particles and are found in the nucleus.(2) They are positive subatomic particles and are found surroundingthe nucleus.(3) They are negative subatomic particles and are found in thenucleus.(4) They are negative subatomic particles and are found surrounding the nucleus.
Which statement defines specific heat capacity for a given sample? A. The temperature of a given sample. B. The temperature that a given sample can withstand. C. The quantity of heat that is required to raise the sample's temperature by 1 degree C (Kelvin). D. The quantity of heat that is required to raise 1 g of the sample by 1 degree C (Kelvin) at a constant pressure.
In WHich sample are the particles arranged in a regular geometric pattern? A.HCI (L) B.I2 (S) C.N2 (G) D.NaCI (aq)
Which statement best describes the formation of a solution? A large amount of solute is dissolved in a smaller amount of solvent. A small amount of solute is dissolved in a larger amount of solvent. A small amount of solvent is dissolved in a larger amount of solute. A large amount of solvent is dissolved in a larger amount of solute.