Stull_Lab#4

rmal text BIUA Arial 17.2 + . 1. . 2. | 3 | 4 in blue ink using complete sentences. 1. How is a physical change different from a chemical change? 2. How do you know a chemical reaction has happened? 3. Give an example of a chemical change. 4. How do you know this chemical reaction has taken place? 5. Name three different properties you can test before and after a chemical reaction to determine if a new substance was formed. 6. What does a catalyst do in a chemical reaction? 7. Are the number of atoms before and after a chemical reaction the same? Why? 8. What are two ways you can tell that the steel wool in the video underwent a chemical reaction? Support | Schoology Blog | PRIVACY POLI

Suppose that you heated the hydrated copper (II) sulphate in a test tube, instead of a beaker. How might this affect your results? 4 MAY 19 ... MacBook Pro & * %23 $ 2 3 4 5 6 7 E Y U G H J K C V M MOSISO command option command レー

> Learning states. Experiment 2: Write the balanced chemical equation for the decomposition of copper(II) carbonate hydroxide. Include physical

Part A Look at the three bottles. What evidence is there that a chemical reaction took place? Part B Compare bottles 1 and 2. How do the amounts of the reactants compare? How do the amounts of the products compare? For these two bottles, does the amount of product appear to be proportional to the amount of ammonia used? Part C Compare bottles 2 and 3. How do the amounts of the reactants compare? How do the amounts of the products compare? For these two bottles, does the amount of product appear to be proportional to the amount of ammonia used? Part D Compare your answers in parts B and C. If your answers to those questions are different, explain why they’re different. Part E Imagine mixing 1 tablespoon of Epsom salt with 2 cups of ammonia. How much precipitate would be produced? Describe the amount of precipitate by comparing it with the amount in bottle 1, 2, or 3. Explain your prediction. i need them all answered please

CHCASE Dashboard Item 3 A student modek four types of land use in a city. Each model has the same amounts of soil, pebbles, and gravel. A bottle is placed under each model to represent an aquifer, as showWn. Item 4 Item 5 Item 6 Item 7 Aqulfer Aquifer Item 8 Model P Model Q Item 9 Item 1 Item Item Aquifer Aquifer Model R Model S Which model represents land use that will recharge groundwater in a city the most, and why? O Model P; it has green spaces with grass and plants. O Model Q; it has neighborhoods with large front yards. O Model R; it has buildings near paved roads and parking lots. O Model S; it has houses near large trees with deep roots.

pour it 2. Still sleepy from a late night studying, you take the milk out of the refrigerator and pour it on your lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation for the fact of coagulated milk onto your cereal. The last time you saw milk coagulate like that was when you added breakfast cereal. Unfortunately, by the time you notice the funny smell you have already poured clumps lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation foea added that spoiled milk coagulates.

Students react zinc with hydrochloric acid to produce zinc chloride and hydrogen gas in a test tube. They weighed the reactants, the flask, and the balloon that captured the hydrogen gas. The zinc was added to the acid and the balloon attached across the mouth of the flask. The table shows the data each group collected. Zinc Zinc & Chloride Hydrochloric & |Group acid Hydrogen gas 155.67 g 155.65 g 2 157.80 g 157.78 g 3 148.22 g 146.54 g 4 155.93 g 155.92 g 169.42 g 169.43 g Explain how the data supports the Law of Conservation of Mass is followed.

What would the balance reaction be?

1. A candle is placed on one pan of a balance, and an equal weight is placed on the other pan. What would happen if you lit up the candle and waited for a while? Suppose the candle was placed in a large, sealed jar that allowed it to burn for several minutes before running out of oxygen. The candle and jar are balanced by an equal weight. In this situation, what would happen if you lit up the candle and waited?

Chemical Reaction Experiments: Coke and Mentos 1. The first bottle has 100 ml of coke and 1 piece of mentos. 2. The second bottle has 100 ml of coke and 3 pieces of mentos. 3. The third bottle has 100 ml of coke and 10 pieces of mentos. Give your observations and why chemical reactions occurred.

- Search 5:50 PM Tue Jun 15 +?L 90% Edited - Complete this.pdf VIRTUAL CHEMISTRY LAB STOICHIOMETRY PART A: WATCH THE VIDEO to fill in the blanks and answer the questions. Cake Recipe 1 cup of sugar 1 cup of flour 2 eggs % cup of milk Stoichiometry is a method of calculating the amounts of products or reactants bascd on a chemical equation. It is very similar to baking 1. Complete table I by adjusting the recipe (image I) so that the missing ingredients align with the data that is already filled in. Image 1: Cake Recipe Table 1: Adjusting the cake recipe Sugar (cups) Flour (cups) Number of Eggs Milk (cups) Number of Cakes 2 2 1/2 2 4 4 2 6. Sugar (cups) Flour (cups) Number of eggs Milk (cups) Number of cakes 1 4. 6. 2. How many grams of NH, are produced when 890.1 grams of N, gas react according to the following balanced chemical equation. Show your work for full credit. N, + 3H, -→ 2NH, 2.

3. Which of the following processes is best described as a chemical change? Upon heating, mercury (II) oxide forms mercury metal and exygen gas. A Evaporation of rubbing alcohol. Deposition of iodine vapor on a surface. d. Grinding rock salt. c.

2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the following would supply evidence to propose a chemical change has taken place? a. The granules dissolve completely. c. The volume of the liquid increases. b. The liquid gives off heat. d. The granules become smaller. 5. Which of the following does NOT indicate a chemical change is occurring? a.…

Ⓒ Macmillan Learning Classify each chemical reaction as endothermic or exothermic. C 20 $ 4 2 H₂(g) + O₂(g) → 2 H₂O(1) + heat 4 Al(s) + 3 0₂(g) + heat → 2 Al₂O3(s) R F T V Endothermic reactions % 5 G Search or type URL T G stv B 6 MacBook Pro Y H 2 C₂H₂(g) + 5O₂(g) 4 CO₂(g) + 2 H₂O(1) + heat & 7 N U ☆ Answer Bank J * 8 00 M - + ( 9 K < H O 1 Exothermic reactions ) O CH₂O(1) + heat →→→→ CO(g) + 2 H₂(g) O P . - : ; { [ I command option + 21 O 11 I I } 1 delet

duction to MasteringChemistry - Attempt 1 duction to Vocabulary Questions Reset Help maple 1. Hardwoods reproduce using flowers and have broad leaves; hardwoods include trees such as pine cedar elm and pine mango 2. Conifer leaves are generally thin and needle-like, while seeds are contained in cones. Conifers cedar include pine and elm elm 3. Deciduous trees lose their leaves seasonally and include trees such as mango and maple 4. Evergreens are plants that maintain their leaves in all seasons and include trees such as elm pine and cedar Submit Previous Answers Request Answer Introduction to Ma. fa トト」 トI fo fo ins prt sc 8% 8 9 10

This is not graded. Do # 12 and 13.

FINAL Experiment 1- January 2021_-789644623 - Saved Layout Review View Table A friend of yours went panning for gold last weekend and found a nugget that appears to be gold. With your newfound scientific prowess, you set out to determine if it is really gold. Your tests show that the nugget has a mass of 7.6 g. Immersing the nugget in water raised the volume from 7.22 mL to 8.06 mL. The density of gold is 19.32 g/cm3. What will you tell your friend? acer

← X g 單 0 Priva Tern C My Account - MySam - Sam Hou X Content X Q mathway calculator - Search https://shsu.blackboard.com/ultra/organizations/_202946_1/cl/outline LI Lets start with the medical components. We need to determine how many units of the syringe connections can be made out of one metric ton of PEI, or around 2205 lbs of the plastic. X M Mathway | Basic Math Problem S X + 1 metric ton = 2205 lbs Starting material - PEI 1 metric ton ≈ 2205 lbs Calculation for number of units of each component: total weight of starting material PEI X Products Medical components Stopcock with Luer Connection, 1-way, male lock unit weight 2.72 g = 3/500 lbs 1 unit of medical component 1 weight of unit of component This calculation assumes all starting material is used during the production of the components. Medical components Products Stopcock with Luer Connection, 1-way, male lock unit weight 2.72 g 3/500 lbs Female Luer Lock 3/16" unit weight 0.63 g 7/5000 lbs Units = If necessary round to the…

*** this is not a graded assignment, I am double checking my answer key please. A vessel of calcium chloride solution (CaCl2) (2 Ca ions and 4 Cl ions represent a .1 M solution)  is mixed with  potassium carbonate (K2CO3) which should be drawn as .2M .Draw the reactant with the appropriate amount of K2CO3 particles in an empty box. The product calcium carbonate (CaCO3) forms a precipitate. Draw the appropriate example of the precipitate and the ions that remain in the solution. Add two water molecules around each ion in the solution.

Multiple Choice. Read the statements carefully and answer the following questions.4. Which is not a physical change?a. Melting of candle      c. breaking a glassb. Digestion of food     d. boiling of waterFor no. 5 & 6 refer to the given equation: Zn + Cu SO4 ----------→ Zn SO4 + Cu5.What are the products in the equation?a. Zn and Cu b. Zn and Cu SO4 c. Zn SO4 and Cu d. Zn only6. What are the reactants in the equation?a.Zn and Cu b. Zn and Cu SO4 c. Zn SO4 and Cu d. Cu only

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