hsc exam 5

6. If you started with 7.25 bsh, how many bgt is equal to this?

2 What is reservior in environmental chemistry? What are O1D (O singlet D) and O3P( O priplet P)? Not sure if it's written in this way.

Answer all Direction. Read the questions carefully. Write the letter of the correct answer. 1. Water exists in three states of matter and continuously moving through a cycle on Earth. At which stage in the water cycle does water transform from a gas to a liquid? a.evaporation b. condensation c. precipitation d. Sublimation 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…

1. Give at least 2 significant examples of chemical reactions that falls on change in intrinsic properties and production of light. 2. Enumerate chemical reaction that may bring benefit or harm to life as well as to environment. Give 1 example for beneficial and 1 for harmful 3. Given the statements, write the chemical equation and label the reactant and product a. Aluminum (Al) reacts to oxygen (O2) to form Aluminum oxide (Al2O3). b. The reaction of sulfuric acid (H2SO4) and sodium hydroxide to produce sodium sulfate (Na2SO4) and water

24. ĮThere are highly active chemicals to be shipped by trucks. Environmental regulations stipulate that two chemicals cannot be shipped in the same truck if the two chemicals react explosively. In the table below, an X in a specific row and column indicates that the chemical of the row reacts explosively with the chemical of the column. If we have one canister of each chemical, how many different trucks must be used to ship the chemicals and what chemicals can be shipped together? Chemicals A B D E F G A X X B X X X X X E X X F X X X X G X X Number of trucks: Chemicals that can be in each truck together: :::

In relating the existing concepts about 'cigarette smoking' in Chemistry and Science-related RRL, what is/are that chemical(s) which is/are ALSO present in the 'product side' of a clean combustion chemical reaction equation?  a. carbon monoxide and carbon dioxide b. carbon c. carbon dioxide and water d. nicotine and tar Choose only one answer. Clue: Letter d is not the answer

In relating the existing concepts about 'cigarette smoking' in Chemistry and Science-related RRL, what is/are that chemical(s) which is/are ALSO present in the 'product side' of a clean combustion chemical reaction equation?  a. carbon monoxide and carbon dioxide b. carbon c. carbon dioxide and water d. nicotine and tar *Choose only one answer

Based on this chart write an balanced chemical equation for number 18 only!!! Which is cocl2 and ca(oh)2

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.

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…

Please help me.......

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

What is Environmental chemistry? What is Stoichiometry? What are the types of chemical reactions? Include sources and cite references.

(A) if both sentences are true, (B) if both sentences are false, (C) if the first sentence is true but the second is false, and (D) if the first sentence is false but the second is true. 1. Radioactive wastes, like uranium, must be handled and disposed of according to special regulations designed to protect people and the environment. Nuclear power plants produce too much greenhouse gases due to the burning of uranium. 2. In the experiment on determining the dissolved oxygen concentration of a water sample, the compound used to acidify the sample was hydrochloric acid. An acidic solution will have a pH greater than 7. 3. Pure water has a slight blue coloration that goes deeper as the thickness of the sample increases. Water follows the temperature of its surrounding. 4. The solubility of oxygen in water increases at colder temperatures, and decreases at higher temperatures. DO can be measured in milligrams of oxygen (O2) per liter of water.  5. An atom is composed of three subatomic…

How are halogens detected in an organic sample? Describe at least two procedures for detecting halogens and their  positive results.

Q29 Santa Monica Big Blue Bus operates a fleet of CNG buses, which run on compressed natural gas (CNG), natural gas that has been compressed into a much smaller volume in the fuel tank. A newly designed CNG vehicle carries about several thousand cubic feet of compressed natural gas which contain 72 kg (kilograms) of carbon. If all of the natural gas is burned, how many kilograms of carbon dioxide will be emitted into the atmosphere? Assume no residue remains and the carbon dioxide is the only product in the combustion. If you are presenting this question, please explain the following: The steps in the calculation process O Please write out the steps involved in the conversion process including the units O Please explain how to operate on the units Please explain how to manipulate the powers of ten by hand (e.g. product rule and the quotient rule) How to apply the appropriate rule to the calculation: O addition-subtraction rule ("the decimal places rule"), OR multiplication-division…

PLEASE DON'T WRITE YOUR ANSWER ON A PAPER. I CAN'T UNDERSTAND HANDWRITTEN. 2. It is 3:00 in the afternoon, and you want to drink a cup of coffee. When you went to the kitchen, you have found out that there is no available instant coffee, only coffee beans. How would you make a cup of coffee using this coffee beans? Explain your answer. 3. In number two, if you are going to put sugar in your coffee, which kind of sugar will you use, sugar in a cube, or fine sugar? Explain your answer.

these are 2 separate questions

A Styrofoam cup was analyzed in a lab and found to contain 92% by mass carbon. How much carbon can be found in a stack of polystyrene cups with a total mass of 569 grams? 0618 grams 520 grams O456 grams 535 grams 575 grams

I am doing multiple ungraded practices on airbags for an upcoming quiz. This is one of the practices i have found online. Read the article i have attached and then answer the questions. Thank you :)   1. What type of reaction occurs initially with sodium azide when airbags initially deploy?2. Write the complete, balanced reaction below.3. What would happen if the manufacturers did not start with the correct amount of sodium azide?4. Based on the article, what is stoichiometry? Why is it important for airbag safety?5. Why is potassium nitrate also in airbags? 6. Write the balanced equation for the reaction between potassium nitrate and sodium below.7. What is the point of silicon dioxide?8. Why are careful stoichiometric calculations important for air bags and safety

Choose the correct option for each question below In case of chemical burns in the laboratory, you should not do one of the following:  1) Cover with dry, clean or sterile material.  2) Rinse the area with large quantities of water.  3) Apply burn ointments or sprays to affected areas.  4) Call emergency services if large areas of victim’s body are affected.

CHM 151 Exp #8 Copper Cycle General Observations: Your instructor has provided pictures and video taken during each of the five different steps (reactions) during this experiment. Please refer to them as you write out your general observations for the experiment. For example: Table 1- General Observations of the Copper Reactions in this experiment Step 1: Cu(s) + 4HNO;(aq) → Cu(NO3);(aq) + 2NO:(g) + 2H;O() Reddish brown gas is produced and the copper dissolves to form a blue solution. The reaction is producing heat (beaker is getting hotter). Since there are five steps in this series there should be general observations written down for each reaction (step) in the series (5). It is important to record observations of color, gas production, precipitate production, dissolving of solids and changes of temperature since these types of general observations are all indicators of a chemical reaction taking place. You will find numbers written in parentheses for the questions placed in the…

Polychlorinated biphenyl (PCBs) are environmental contaminants composed of carbon, hydrogen, and chlorine atoms. A news report states that a new method of disposal of PCBs converts them completely to carbon dioxide and water. The necessary oxygen atoms come from the oxygen in the air. Do you think that this method will work? Please explain.

The compound known as butylated hydroxytoluene, abbreviated as BHT, contains carbon, hydrogen, and oxygen. A 3.751 g3.751 g sample of BHT was combusted in an oxygen-rich environment to produce 11.24 g11.24 g of CO2(g)CO2(g) and 3.680 g3.680 g of H2O(g)H2O(g). Insert subscripts to complete the empirical formula of BHT.

·       A hypothesis about CO2 emissions.

Write a balanced equation for the following by inserting the correct coefficients (if a coefficient = 1, enter "1" in the provided box). BC13(g) + H₂O()- H3BO3(s) + HCl(g)

Your Answers: Assess It! 4. As we look around space we find that most of it is composed of (4). hydrogen combines with carbon which is the basis for all living things. Combining different (6). A group of two or more atoms that are bonded together is called a (7). are combined in a specific way, or ratio, the substance is called a (8). of hydrogen. When the forms a (5)_ 7. together form different substances. 8. _. And when the elements (e.g. water). DELL 5. 6.

5 please help! *urgent* write as many accurate and relevant statements about the picture below. please write more than 5 correct descriptions/statements. please be as descriptive as possible.

1.Explain the slogan about chemical safety " A spill, A slip, A hospital trip" 2.How do you apply 5s(sort, set in order, shine, standardize, sustain) to attain chemical safety at home and in school?. Enumerate

Paragraph 5: Discuss Fractional Distillation of petroleum oil to give the chemical feedstock to make synthetic polymers for commercial use of products in our daily lives and discuss your personal thoughts on incresing US drilling in the Gulf of Mexico or in the Artic. Think about it, every time you go to the grocery store and get a plastic bag which immediately gets discarded. Include your thoughts on mandatory recycling in the US especially for schools, government buildings, etc.

Please help

Scientists have correlated average global temperature with atmospheric carbon dioxide levels for the last 160,000 years using ice cores from Antarctica.  How is the carbon dioxide level determined?   A. By measuring the carbon dioxide concentration in trapped air bubbles in the ice layers   B. By measuring the 18O/16O ratio in the carbon dioxide molecules   C. By extrapolating the carbon dioxide level from the temperature of the ice   D. By extrapolating the carbon dioxide level from the average global temperature