silica in class guide 472

Direction: Classify each example below. Write C, if it is chemical, M, if it is mechanical, and B, if it is Biological Weathering. 1.) A seed has found its way into a rock and a plant is beginning to split the small stone. 2.) The pollution has recently been high, and acid rain is destroying some monuments. 3.) A combination of fungi and algae grow upon the surface of a rock slowly "eating it away". 4.) Flooding has caused a landslide and part of the hillside has been affected. 5.) The salty water of the ocean is eating away the concrete support posts of the pier.

What distinguishes substances like salt and sugar from those found in e-waste like lead,mercury, cadmium and arsenic?

2Na + BaCl2 --> Ba + 2NACI is what type of reaction?

Which type of coal has the lowest carbon content? A. anthracite B. lignite C. peat

QUESTION 4 From the Coursebook: What is a useful marker point for the Global Anthropocene? When glacial sediments are replaced by organic sediments When Carbon Dioxide (CO2) and Methane (CH4) first get recorded in rocks and sediment When Carbon Dioxide (CO2) and Methane (CH4) first appeared in the atmosphere Excess of radioactive isotopes such as 14C and 239Pu in rocks and sediments

How many pounds of CO2 would you be responsible for emitting if you took a bus and traveled 164 miles? If that bus got 8 miles per gallon and released 22 lbs of CO2 per gallon of gas, but was carrying 20 Passengers?

what is the Gravimetric analysis? how we can use it to determine the Phosphorus content of commercial plant food?

7. Methylhydrazine is commonly used as a liquid rocket fuel. Its combustion is indicated by the following reaction. N₂H3 CH3(1) + O20) → N2(9) + CO2(g) + H₂O (9) a. Balance this equation. b. Calculate AH for this reaction.

The 24 power plants in Baltimore metro area collectively emit about 40,300 metric tons of CO2 per day (www.carma.org), thereby increasing the level of greenhouse gases in this region. To counter this, environmentalists plan to plant trees in the area. How many moles of CO2 are emitted by these power plants every day? (1 ton =1000kg, molecular weight of CO2 is 44g) If on average 500 moles of glucose are synthesized by a tree each day, how many moles of CO2 can a single tree convert to glucose in a single day? How many trees need to be planted to reabsorb all the CO2 released into the atmosphere every day by these power plants? If a single tree occupies an average of 8.00 x 10-5 sq miles, what percent of the area of Baltimore city needs to be forested to counter the CO2 emitted from power plants alone?  (total area of Baltimore city is 92.00 sq miles)

How is using thamine as a catalyst rather than cyanide an application of green chemistry?

Form a hypothesis that might explain which season is CO2 concentration the highest and which season the lowest and write a brief description explaining why it is the way it is. Hint: Plant photosynthesis reduces the CO2 concentration and decay processes increase

Dynamite consists of nitroglycerine mixed with diatomaceous earth or cellulose. What is another name for dynamite?     KBr     KOH     TNT     C-4     CFC

A typical coal-fired electric generating plant will burn about 3 metric tons of coal per hour. Most of the coal burned in the United States contains 1 to 4 % by weight sulfur in the form of pyrite, which is oxidized as the coal burns: 4FeS2(s) + 11 O₂(9) 2 Fe2O3(s) + 8 SO₂(9) Once in the atmosphere, the SO₂ is oxidized to SO3, which then reacts with water in the atmosphere to form sulfuric acid: If 47.7 metric tons of coal that contains 3.80 % by weight S is burned and all of the sulfuric acid that Hint: 1 metric ton = 1000 kg SO3(g) + H₂O(1)→ H₂SO4(aq) formed rains down into a pond of dimensions 335 m x 285 m x 5.54 m, what is the pH of the pond? (OK to assume 2 mol H3O+ per mole H₂SO4.)

The research group has recently focused on identifying the chemical properties of fluorocarbons, such as CF4 and C2F4. These fluorocarbons display a very different reactivity compared to hydrocarbons. Teflon (C2F4)n is a fluoropolymer. When Teflon is mixed with silica at high temperature, all solid decomposes into gases. Write down the reactions that can take place during the process and explain your reasoning.

Given the following balanced chemical equation, calculate the theoretical yield of carbon dioxide from combusting 32.6 grams of C6H12O6 (glucose) with 57.6 g of oxygen. C6H12O6 + 6 O2 ➞ 6 CO2 + 6 H2O

-> Review A Bookmark Concept S21 / 6 of 16 What is the percentage of metal in the compound Iron (III) Chromate (Fe2(CrO4)3)? O A. 24.30% B. 58.23% C. 55.78% D. 39.79%