Art 6

In the table below, there are descriptions of an experiment on samples of three different chemical elements. Decide whether the element is a metal or nonmetal, if you can. If there is not enough information to decide, choose can't decide in the third column. element description metal or nonmetal? ? Element 1 is a moderately soft silvery-gray solid. A 5 cm x 5 cm square of it, only 1 mm thick, is twisted using two pairs of pliers. The sheet breaks in the middle. The freshly broken edges are lighter colored than the surface. metal 1 nonmetal (can't decide) Element 2 is a shiny silvery-gray solid. A 10. g cube of it is set on a hot plate. After 10 minutes, the temperature of the top of the cube has risen by less than 1 °C. metal 2 nonmetal (can't decide) Element 3 is a hard silvery-gray solid. Wires are fastened to each side of a 2 cm slab of it, and an ordinary household 9 V battery is hooked up so that it can feed electricity through the slab to an LED. The LED glows brightly. metal…

Percentage Abundance. The element rubidium consists of two isotopes, one having an isotopic mass of 84.912 and the other having an isotopic mass of 86.920.  Determine the percentage abundance of the lighter isotope.  Record the answer to the correct number of significant figures. Show the numerical set-ups.  Include units and the correct number of significant figures in the set-up.

Please use this word bank to fill in the blanks of the first 5 questions. Atom 1. S is a/an 2. Sg is a/an (Yes! You can use more than one per blank spot!) element molecule Homogenous mixture 3. MgSO4 is a/an 4. A sample of filtered seawater containing Li+, Na+, K+, SO42, NO3¹, and Cl is a/an 5. A grey sample of basalt riddled with golden cubes of pyrite (FeS₂) is a/an 6. What is the state of S8 (s) at room temperature? compound Heterogeneous mixture 7. Give the full atomic symbol of S. 8. Give the subatomic particles of S.

The element rubidium consists of two isotopes, one having an isotopic mass of 84.912 and the other having an isotopic mass of 86.920.  Determine the percentage abundance of the lighter isotope.  Record your answer, to the correct number of significant figures, in the box below; do not include the units of your final answer.  Then show your numerical set-up(s) in the next question.

In the table below, there are descriptions of an experiment on samples of three different chemical elements. Decide whether the element is a metal or nonmetal, if you can. If there is not enough information to decide, choose can't decide in the third column. element description metal or nonmetal? Element 1 is a hard silvery-gray solid. Wires are fastened to each side of a 2 cm slab of it, and an ordinary household 9 V battery is hooked up so that it can feed electricity through the slab to an LED. The LED glows brightly. metal 1 nonmetal (can't decide) Element 2 is a moderately soft silvery-gray solid. A 5 cm × 5 cm square of it, only 1 mm thick, is pressed into a dish-shaped mold under high pressure. When the press is lifted up, the sample has been crushed to a powder. metal 2 nonmetal (can't decide) metal Element 3 is a moderately soft silvery-gray solid. A 5 cm x 5 cm square of it, only 1 mm thick, is twisted using two pairs of pliers, giving it a slight curve. 3 nonmetal (can't…

You're competing on a Great British television game show, and you need to bake a cake. The quantity for each ingredient is given in grams, but you haven't been given a kitchen scale. Which of these properties would correlate with the mass of a baking ingredient like eggs or milk? Check all that apply. depth of color viscosity volume density

Write the chemical formula for each compound described. magnesium chloride (1 Mg ion, 2 Cl ions): sodium oxide (2 Na ions, 1O ion): App Store ame MAR 29 MacBook Air DII DD 80 F8 F9 F10 F11 F7 F6 F3 & # $ 7 8 9 delet %3D 3 4 6 { } E T Y U | F H J K > с V command option and + II .. .. リ V - B. R

Two or more substances in variable proportions, where the composition is constant throughout are a compound. an element. a heterogeneous mixture. a homogeneous mixture. a crystalline solid.

In water molecules from ice cores, the ratios of isotopes, 2H/¹H and 180/¹60 depends upon temperature of the water that precipitates from an air mass, and thus on average climatic temperatures. This allows climatologists to determine historical temperatures from analysis of the isotope ratios of hydrogen and oxygen in water molecules from ice cores. As temperature increases, the 180/160 ratio [Select] and the 2H/¹H ratio [Select]

student found a bottle of unknown origin in the basement of an "CAUTION—contains С₁H₁O.” No other A old house. The bottle was labelled information was given, but inside the bottle were some white crystals. The student took the bottle to a chemistry laboratory, where she analyzed the crystals with the help of the laboratory staff. C₁2H₁6O reacted with Br₂ in CCl4 adding one mole of Br, and forming C₁₂H₁OB2₂. When a sample of C₁₂H₂O was reacted with O3 followed by Zn/H₂O, two different samples, J and K, were obtained. Compound J had a molecular formula of C.HgO₂, and its NMR is shown below. Compound K had a molecular formula of C₂H₂O, and it could be oxidized to compound L, with a molecular formula of C₂H₂O₂. The IR spectrum of L showed a very wide, strong band centred around 3000 cm*¹. The NMR spectrum of L showed only two different absorptions: a doublet (6H) at 0.9 ppm and a septet (1H) at 3.6 ppm. There was also a singlet (1H) off the scale at 11.8 ppm. students, deduce possible…

State the number of protons in Ag^+. Express your answer as an integer.   State the number of electrons in Ag^+. Express your answer as an integer.

Please answer question 17 Part A

Manganese makes many different compounds with oxygen—six that are stable in air and others that are not. The mass of manganese per gram of oxygen in three of those compounds is given in the table below. Show that these masses are consistent with the law of multiple proportions. Compound Grams Mn per Gram O a 2.2892 2 2.5753 iii 0.98107

Mixture is a combination of two or more substances that are not chemically combined. The substances are formed together but no new substance is formed. A mixture can be of any form. It may be solid, liquid or in gaseous form. Mixtures can be classified according to their appearance. Uniform mixtures or Homogenous Mixtures have substances that cannot be recognized because solutes completely dissolve in the solvent while Nonuniform or heterogeneous mixtures have components which can be identified easily. EXPERIMENT: Forming Mixtures A. Materials: Three glasses, water, teaspoon, flour, food color/soy sauce, cooking oil, pebbles/small stones B. Procedure: 1. Half-fill the four glasses with water. 2. Put the food color/soy sauce in one glass. Stir. Label it as "Set A. 3. Put a teaspoon of flour in the second glass. Stir. Label it as "Set B". 4. Put a teaspoon of cooking oil in the third glass. Stir. Label it as "Set C". 5. Put the pebbles/small stones and the flour in a plate or petri dish…

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Suppose you need 6.0 m of Grade 70 tow chain, which has a diameter of 3/8" and weighs 2.16 kg/m, to tow a car. How would you calculate the mass of this much chain? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols. mass of chain- 0.0 X H 0²

There are four sketches below. The first sketch shows a sample of Substance X. The three sketches underneath it show three different changes to the sample. You must decide whether each of these changes is possible. If a change is possible, you must also decide whether it is a physical change or a chemical change. Each sketch is drawn as if the sample were under a microscope so powerful that individual atoms could be seen. Also, you should assume that you can see the entire sample, and that the sample is in a sealed box, so that no matter can enter or leave. Sample of Substance X Change 1 Change 1 is O impossible O O a chemical change a physical change Change 2 Change 2 is: impossible O a physical change O a chemical change Change 3 000 000 Change 3 is: O impossible O a physical change O a chemical change X

There are four sketches below. The first sketch shows a sample of Substance X. The three sketches underneath it show three different changes to the sample. You must decide whether each of these changes is possible. If a change is possible, you must also decide whether it is a physical change or a chemical change. Each sketch is drawn as if the sample were under a microscope so powerful that individual atoms could be seen. Also, you should assume that you can see the entire sample, and that the sample is in a sealed box, so that no matter can enter or leave. Sample of Substance X Change 1 Change 2 Change 3 Change 1 is: Change 2 is: Change 3 is: O impossible O a physical change O a chemical change O impossible O a physical change O a chemical change O impossible O a physical change O a chemical change

There are four sketches below. The first sketch shows a sample of Substance X. The three sketches underneath it show three different changes to the sample. You must decide whether each of these changes is possible. If a change is possible, you must also decide whether it is a physical change or a chemical change. Each sketch is drawn as if the sample were under a microscope so powerful that individual atoms could be seen. Also, you should assume that you can see the entire sample, and that the sample is in a sealed box, so that no matter can enter or leave.

There are four sketches below. The first sketch shows a sample of Substance X. The three sketches underneath it show three different changes to the sample. You must decide whether each of these changes is possible. If a change is possible, you must also decide whether it is a physical change or a chemical change. Each sketch is drawn as if the sample were under a microscope so powerful that individual atoms could be seen. Also, you should assume that you can see the entire sample, and that the sample is in a sealed box, so that no matter can enter or leave.

There are four sketches below. The first sketch shows a sample of Substance X. The three sketches underneath it show three different changes to the sample. You must decide whether each of these changes is possible. If a change is possible, you must also decide whether it is a physical change or a chemical change. Each sketch is drawn as if the sample were under a microscope so powerful that individual atoms could be seen. Also, you should assume that you can see the entire sample, and that the sample is in a sealed box, so that no matter can enter or leave.

A standard curve for absorbance vs. concentration has an equation of y = 2.0x.  If an unknown compound has an absorbance of 0.856, what is its concentration? Units not required. Report your answer to the correct number of significant figures.

Assume the observable Universe is charge neutral, and that it contains n nuclei (hydrogen plus helium nuclei, ignoring other elements).  Take the helium mass fraction as 1/4.  How many electrons are there in the observable Universe?  Enter your answer in scientific notation with one decimal place.   n = 7*10^80

The law of constant composition can be used to find the answer  A sample of the chemical compound "lysine" is synthesized in a lab in its pure form by a chemist. The chemist analyzes her sample and finds it contains 9.77 grams of carbon and 19.9 grams of hydrogen. Another chemist does experiments and isolates a sample of lysine from a fish and then finds that in his purified sample he has 17.4 grams of hydrogen. How many grams of carbon are there in the lysine sample that was isolated from a fish?