Alkaline earth metals Study guides, Class notes & Summaries

CHEM 1020 Exam 1 Questions With 100% Correct Answers 2023 matter any solid, liquid, gas, or plasma that occupies a space and has mass homogeneous mixture mixture that is uniform throughout (solution) heterogeneous mixture mixture that is not uniform throughout atoms smallest unit of an element element many atoms of the same type; most basic building blocks compounds different elements bonded together (pure substance) chemical symbols one or two l...

TCEQ Class D Water Operator License Exam Questions and Answers Latest 2024/2025 (100% Correct) Graded A+. Water covers approximately ________ of Earth's surface. (Ans- 71% Drought is an extended period when a region receives a deficiency in its ________ water supply. (Ans- atmospheric, ground, or surface T/F: Only about 1 gallon of tap water per person/day is used for drinking and cooking (Ans- True Excluding outside water use, the average household uses about _______ gallons of water ...

Lemon juice is acidic, which is an example of a______? a. physical property b. chemical property c. physical change d. chemical change - b. chemical property Which measurement contains four significant figures? a. 0.00k km b. 3400 K c. 20.10 mL d. 0.350 L - c. 20.10 How many significant figures will the answer to the following calculation have? (4.593m - 4.589 m) / 4.489 a. 1 b. 2 c. 3 d. 4 - a. 1 How many meters are in 25 x 10^-3 kilometers? a. 250 meters b. 0.25 meters ...

Hypothesis vs Theory vs Law - Answer-Hypothesis: If, then, because Law: Statement or equation about a relationship - ex: force = mass * gravity Theory: Explains why a law exists Law of Conservation of Mass - Answer-Mass is always constant - Reactant mass = Product mass They are used (upheld) in chemical equations Three common states of matter and their characteristics - Answer-- Solid (s): color - Liquid (aq): melting point, solubility - Gas (g): Difference between Elements, Compounds,...

FSE 114-901 MIDTERM EXAM REVIEW QUESTIONS AND ANSWERS, GRADED A+/ - -•Colorless, odorless, tasteless liquid •Freezes at 0oC and boils at 100oC at standard atmospheric pressure •Heat of fusion: 80 calories/gram •Heat of vaporization: 540 calories/gram •Specific heat: 1 calorie/gram · oC •Very good solvent form many substances •Oxygen does not burn - -Is added to the fuel and enables it to burn more rapidly 0.27 rem - -The average radiation dose per year for a person is a...

Period What do each color in the periodic table represent? Group What do each color in the periodic table represent? Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:00 / 0:15 Full screen Element What is this? Main Group Elements What are the elements shown here in green and red represent? Transition Metals What are the elements shown here in yellow? Inner Transition Metals What are the elements show...

Mendeleev's contribution to the Periodic Table - Answer Arranged known elements into vertical groups according to chemical properties. Arranged known elements in order of increasing relative atomic mass into horizontal periods. subshells - Answer Energy levels within the major shells. orbitals - Answer Region of space in which electrons are thought to move, under the influence of its attraction to the nucleus. Ground state of an atom - Answer The electron configuration of an a...

Polymers of silicon, oxygen, and carbon are called what? Silicones Mineral compounds containing metals and silicon-oxygen groups are called what? Silicates Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:00 / 0:15 Full screen Milk of magnesia is used in stomach antacid and laxatives is a suspension of what? Magnesium hydroxide Epsom salts are used in hot baths to reduce swelling are a hydrate of what? Magnesium sul...

Chapter 03 - Atoms and Elements 1. The most abundant element in the earth's crust by mass is: a. Hydrogen b. Carbon c. Oxygen d. Silicon e. Nitrogen ANSWER: POINTS: 2. Which of these statements about atoms is incorrect? a. Atoms are the smallest visible amount of an element. b. Atoms are composed of protons, neutrons, and electrons. c. Atoms are the building blocks of all matter. d. Atoms are the smallest identifiable unit of an element. e. There are 91 different naturally occurrin...

Catalyst (enzyme) -correct answer A substance that increases the rate of a chemical reaction without being changed itself, lowers the activation energy needed for a reaction Electrolyte -correct answer A substance that is dissolved in solution and some of its molecules split or dissociate into electrically charged atoms or ions Oxidant -correct answer Causes a GAIN of electrons and is REDUCED in a chemical reaction Reductant -correct answer Causes a LOSS of electrons and is OXIDIZED in ...