Which of an atom's electrons are involved in chemical reactions? a. The electrons farthest from the nucleus of the atom b. The electrons that make one isotope different from another c. The electrons that determine the atomic number of the atom d. The electrons closest to the nucleus of the atomSeen 1 years ago linadea 2 answers
Change Worksheet answer the following questions. The graph was drawn from data collected as a substance was heated at a constant rate. Use the graph to 180 160 Phase Change Diagrarn 140 120 Temperature (°C) 100 D B स 80 60 40 2 4 6 8 16 18 20 22 10 12 14 Tim e (minutes) At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has Deontz_ volume and __ha2_shape. With each passing minute, is added to the substance. This causes the molecules of the substance to me more rapidly which we detect by a t2 Maturise in the substance. At point B, the temperature of the substance is __°C. The solid begins to_A At point C, the substance is completely or in a mate state. Material in this phase has_Det volume and shape. The energy put to the substance between minutes 5 and 9 was used to convert the substance from a 3D This heat energy is called the latent heat of fusion. (An interesting fact.) to a to a Between 9 and 13 minutes, the added energy increases the du of the substance. During the time from point D to point E, the liquid is By point E, the substance is completely in the phase. Material in this phase has volume and shape. The energy put to the substance between minutes 13 and 18 converted the substance from a state. This heat energy is called the latent heat of vaporization. (An interesting fact.) Beyond point E, the substance is still in the phase, but the molecules are moving as indicated by the increasing temperature, Substance Melting point Boiling point Bolognium 20°C 100 °C Which of these three substances was likely used in this Unobtainium 40°C 140 °C phase change experiment? Foosium 70 °C 140°C ONUS: For water, the value for the latent heat of vaporization is 6.8 times greater than the latent heat of fusion. Imagine we were ding heat at a constant rate to a block of ice in a beaker on a hot plate, and it took 4 minutes for the ice to melt completely. How uld it take, after the water started boiling, for the beaker to be completely empty (the liquid water totally converted to water vanSeen 1 years ago Dottyillie 1 answers
KI + Pb(NO3)2 → Pbl2 + KNO3 This chemical reaction represents the reaction of potassium iodide (KI) and lead nitrate (Pb(NO3)2) to form lead iodide (Pbl2) and potassium nitrate (KNO3). When correctly balanced, the coefficient for lead iodide will be_________. Select one: 3 6 2Seen 1 years ago ym65hvwzme 1 answers
Layla is helping to clean car parts with a single chemical, but it isn't working. She washes her hands and tries a different chemical, which also does not work. She resumes with the first chemical without washing her hands. This time, the cleaning process works, but she begins to get dizzy and nauseated. What can Layla infer about the possible reason for her illness? It is an acute effect of two toxins with a synergistic relationship. It is a chronic effect of the second toxin she used to clean the parts. The first chemical has an antagonistic relationship with the second. The second chemical causes acute affects, and the first causes chronic affects.Seen 1 years ago Reefwblackford 1 answers
What was the main reason why Alfred Wegener’s theory about the movement of the continents was dismissed in 1912? Question 8 options: His map of the ocean floor did not support his theory His theory was the first to observe the continents fit together His theory explained the Earth was expanding as the plates moved He didn’t know about plate tectonics to explain how the plates movedSeen 1 years ago andresjohnston 1 answers
HELPPP In Ernest Rutherford's gold foil experiment, he directed a beam of alpha particles at a thin sheet of gold foil. Why didn't all of the alpha particles pass through the gold? Select one: Some of the alpha particles came into contact with the electrons. Some of the alpha particles came into contact with the relatively massive nucleus. Some of the alpha particles came into contact with the electron cloud. Some of the alpha particles came into contact with other alpha particles.Seen 1 years ago ym65hvwzme 1 answers
The forces exerted on an object are shown.help asap!!!!! (i will mark brainliest)A box has an arrow pointing down labeled F and an arrow pointing up labeled 5 N.Which of the following happens when F is less than 5 N?The object moves up.The object moves down.Balanced forces keep the object stationary.Balanced forces keep the object's speed constant.Seen 1 years ago jeannie3902 2 answers
Which statements support the student's claim that the matter and energy o the instant hot pack are conserved even though the temperature of the instant hot pack changed? Select the two correct statements. The mass of the instant hot pack did not change because the A same amount of matter was present. e The mass of the instant hot pack did not change because the total amount of energy was conserved. Matter was conserved because it flowed from the hot pack to С the jar, as shown by the temperature data. Energy was conserved because it flowed from the instant hot D pack into the jar causing the jar to warm, as shown by the temperature data. The instant hot pack transferred energy as cold flowed from the jar into the hot pack and changed the temperature of the jar, until both were at the same temperature.Seen 1 years ago nevaeh9394 1 answers
A. Explain why similar rock sequences and ages support the claim that the continents have moved over time. B. Look at the map of the location of continents 200 million years ago. Based on the map, identify which continent would be the most likely place to find rock sequences and ages similar to these, and explain why.Seen 1 years ago deibimunguia4 1 answers
Which statements accurately describe the rock cycle? Check all that apply. Any type of rock can change into any other type of rock by weathering and erosion. Rocks change from one type to another in a definite order. Rocks change slowly over time. The rock cycle shows how the three rock types relate to one another. Rocks last forever.Seen 1 years ago Ariannambballer19 1 answers
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