Substance Abuse

Science
4.)When two or more atoms of the same of the same element are in a chemical bond, the substance is called a(n)________ A.)Compound B.)Molecule C.)Nucleus D.)Particle*** Am I'm correct? BUT My mom disagree's and says C?, isn't she wrong?

Chemistry
Pyridine, a substance used as a catalyst in some synthetic reactions is a very weak base its degree of ionization is equal to 0.03% in solution 0.02 mol L -¹. Determine the ionization constant.

Chemistry1
The questions asks to write a word equation and a balanced chemical equation for a reaction between aqueous copper (ii) sulfate and solid iron. Assume that iron forms the Fe2+ ion.) Include proper states of matter after each substance (s, l, g, aq). Here is what I got ANSWER: ...

Health (can someone plz check my answers??)
1. The functions of the respiratory system are... (there are two answers) A. To pump blood to the body B. To deliver oxygen to the body*** C. To remove carbon dioxide from the body*** D. To absorb nutrients 2. The dome-shaped muscle that lies below the lungs and is important ...

Health
1. The exchange of carbon dioxide and oxygen takes place in the A. alveoli** B. asthma C. bronchi D. diaphragm 2. ________ is a substance in tobacco smoke that reduces the blood ability to carry oxygen A. Tar B. Nicotine C. Asthma D. Carbon monoxide** Check

Health
1. The functions of the respiratory system are (choose 2) A. to pump blood to the body** B. to deliver oxygen to the body** C. to remove carbon dioxide from the body D. to absorb nutrients 2. ______ is a substance in tobacco products that causes stained teeth and skin A. ...

Health and Physical Ed
If you choose to smoke, your body will use this substance less efficiently. 1:microorganisms 2:carbon dioxide 3:plasma 3:oxygen I think it is #3

science
a 54-gram sample of an unknown material has a volume equal to 20cm3 what is the identity of the substance

Math
An unknown radioactive substance has a half-life of 124 years. How long will it take a 67 grams sample to degrade to 18 grams?

science
construct a heating curve for a substance that is heated to 150 deg centigrade. The substance is originally solid at 35 deg c, melts at 75 deg c and boils at 126 dec c

Science
The diagram below shows the structural formula and 3D model of the same substance. Which substance is represented by the diagram above? A. H2O ? B. OH C. H2O2 D. OH2 PLZ HELP ASAP @miss sue

chemistry
Limestone rock contains solid calcium carbonate that can react with acid to give products. In one experiment, 1.452 g of limestone rock is pulverised and then treated with 25.00 mL of 1.035 M HCl solution. After the reaction is completed, the resulting mixture is still acidic...

Sciences
What is a substance that cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting? A crystalline solid A sublimation A pure substance •• An amorphous solid Correct me if I'm wrong

health help plz
1. the exchange of carbon dioxide and oxogen takes place in the A. alveoli**** B.asthma C.bronch D.diaphragm 2. _______ is a substance in tabacco products that causes stained teeth and skin. A.nicotine B.carbon monoxide**** C.tar D.menthol 3. _______ is a substance in tabacco ...

Health-Please Help!!!
1. The functions of the respiratory system are (select all that apply) A. to pump blood to your body B. to deliver oxygen to the body C. to remove carbon dioxide from the body D. to absorb nutrients 2. The dome-shaped muscle that lies below the lungs and is important in the ...

Math
I need help in algebra 1. I have 4 questions, I already answered 3 of them, but I need help with the other Andrew measures the amount of a very unstable substance to be 100 moles. The half-life of this substance is 3 days (after 3 days, half is gone). 1. Write an exponential ...

Chemistry
Construct a cooling curve (looks the same as a heating curve) for a substance with a molar mass of 200 that has a gas phase specific heat capacity of 2.9J/g K, a boiling point of 525 K,a liquid phase specific heat capacity of 3.24 J/g K, a freezing point of 352 K, a solid ...

Chem
For a substance to look red, describe how it interacts with white light?

Chemistry
a. Calculate the expected freezing-point depression of a 0.200 m KNO3 solution. b. Will the value you calculated match the actual freezing-point depression for this solution? Why or why not? a). -0.372 degrees Celsius b). Possibly because not all of the substance ionizes 100% ...

criminal justice
Schlomo occasionally drinks beer with friends. His drinking doesn’t interfere with his job or personal obligations. He gets a pleasant “buzzed” feeling from two beers and doesn’t feel a need to drink more. Alcohol has not caused him any physical or psychological ...

Chemistry
Of the following (a through e), which increase and which decrease, as the strength of the attractive noncovalent interactions increases? Explain. a) Deviations from the ideal ga law b) Boiling Temperature c) Sublimation temperature d) Vapor Pressure e) The energy it takes to ...

Physica
Had this question answered answered before but I could not understand the explanation. Can someone else please help me? What is the likely identity of a substance (see Table 10-1) if a sample has a mass of 9.38 g when measured in air and an apparent mass of 8.55 g when ...

Physics
What is the likely identity of a substance (see Table 10-1) if a sample has a mass of 9.38 g when measured in air and an apparent mass of 8.55 g when submerged in water? A)Copper B)Iron or steel C)Aluminum D) Lead E)Concrete F)Gold

Science
if a strong odour is smelt continuously for some time the sensation of smell of that substance weakness why?

Science
Plz correct me!! A student combined water, sugar, and salt in a beaker. Which of the following statements is true? (1 point) The individual substances can be separated by physical means. The individual substances cannot be separated by physical means.* A new substance is made ...

chemistry
Describe the circumstances in which the following processes could be used to separate the components of a mixture. -sublimation -crystallization -evaporation of a solvent from a solution -dissolving of an impure substance in a solvent

chem
How much heat (in kJ) is required to warm 10.0 g of ice, initially at -13.0 ∘C, to steam at 109.0 ∘C? The heat capacity of ice is 2.09 J/g⋅∘C and that of steam is 2.01 J/g⋅∘C. The heat capacity of liquid water is 4.18 J/g⋅∘C. ...

Chemistry
Nicotine is a basic substance and its dissociation constant is about 1.0 x 10-6. To prepare a solution water with 0.01 mol L-1, calculate the PH

Biochemistry
If the same amount of heat is added to equal masses of each of the following substances, which substance will undergo the largest temperature change? Substance Specific heat(j/gC) Al (s) 0.90 Cl2(g) 0.48 C6H6(l) 1.7 H2O (l) 4.2 NaCl(s) 0.87 temp. change = 1/S.H. (specific heat...

Science
Which of the following is pure substance? Chocolates milk Orange juice Seawater Hydrogen peroxide I'm not sure what's the right answer!!

Health connexues academy
when reading a recipe ingredients, which substance make the recipe an unhealthy choice if it is present in a high amount A.fiber B.protein C. trans fat D. unsaturated fat

Chemistry
Would a substance that has a granular appearance, is not soluble, melts under a bunsen flame, and does conduct as a solid or liquid have an ionic, covalent or metallic bond?

Chemistry
Would a substance that is shiny, does not dissolve in water, does not melt under a bunsen flame, and does not conduct as a solid have a covalent, ionic, or metallic bond?

Physics
If the substance of 1kg mass is converted completely into energy then how many kilowatt energy will be produced?

Chemistry
Would a substance that is shiny, does not dissolve in water, does not melt under a bunsen flame, and does not conduct as a solid have a covalent, ionic, or metallic bond?

SCIENCEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
1. The current atomic model would be revised if (1 point) better microscopes were being used to study its structure. better microscopes are invented in the future. new information about an atom’s structure is discovered. a new element is discovered in the future. 2. Melinda...

math
the amount of radioactive substance prsent at anytime is given by q(t)=Q0e-0.1 How will it take for the radioactive substance x to decay to 30% of its original amount?

MATH Precalculus
1) A radioactive substance decays exponentially. A scientist begins with 150 milligrams of a radioactive substance. After 26 hours, 75 mg of the substance remains. How many milligrams will remain after 46 hours? 2) A house was valued at $110,000 in the year 1988. The value ...

Chemistry
Substances A and B, initially at different temperatures, come in contact with each other and reach thermal equilibrium. The mass of substance A is twice the mass of substance B. The specifi c heat capacity of substance B is twice the specifi c heat capacity of substance A. ...

chemistry, physics
How would you be able to utilize a calorimeter to determine the specific heat of substance that has a lower density than water?

maths
The half-life of lead is 22 years. How long will it take for a sample of this substance to decay to 80% of its original amount

Algebra
Use the formula pH = −log[H^+] 9.. The hydrogen ion concentration of a substance is 4.3*10^-6 × moles per liter.Find the pH. Round to the nearest tenth. 10. Find the hydrogen ion concentration of a solution whose pH is 5.3.

7th Math
I previously posted this today at 5:39 am and I am reposting this because I don't want this to be buried with other unanswered questions and I realized this was the wrong subject. Please check the 2 questions/problems along with my answers. Thank you tutors. Writing Ratios 1. ...

Algebra
Please check the questions/problems along with my answers. Thank you tutors. Writing Ratios 1. Top-of-the-line monster masks are made of rubbery silicone, using a liquid silicone base and a catalyst (substance that speeds up a chemical reaction) in a ratio of 1 to 1. What is ...

Algebra 2
A radioactive substance decays at a rate of y = ae^-0.1483t, where t in in hours. Find the half-life of the substance. How do I solve this problem if I am only given the constant.

Chemistry
A substance undergoes a first-order decomposition. After 40.0 min at 500 degrees C, only 12.5% of the original sample remains. What is the half-life of the decomposition? If the original sample weighted 243 g, how much would remain after 2 hours?

chemistry
Two substance have the same mass and are both initially at 15.0 C. They both absorb 110 J energy. Which substance will have the higher temperature, the one with the higher or lower specific heat? Explain

chemistry
How do you work out the pKa of a substance from the titration curve that has two equivalence points?

HEALTH PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
1. The functions of the respiratory system are (select all that apply) A. to pump blood to your body B. to deliver oxygen to the body C. to remove carbon dioxide from the body D. to absorb nutrients 2. The dome-shaped muscle that lies below the lungs and is important in the ...

Calculus
The amount remaining of a radioactive substance after t hours is given by A(t) = 100ekt. After 12 hours, the initial amount has decreased by 4%. How much remains after 48 hours? What is the half-life of the substance?

Pre-calculus
Initially 600 milligrams of a radioactive substance was present. After 7 hours the mass had decreased by 3%. Construct an exponential model A(t) = A0ekt for the amount remaining of the decaying substance after t hours. Find the amount remaining after 24 hours.

Physical sciences
Should 20 g of aluminium be mixed with 65 g of iron oxide and ignited, which substance will be the limiting reagent?

P.E/Health
1. When consuming fats the healthiest choice is foods high in? A. saturated fats B. unsaturated fats * C. trans fat D. cholesterol 2. The body's main energy source should come from what essential nutrient? A. protein B. fat C. carbohydrate*** D. minerals 3. The essential ...

Physics
Using the data in the table below,determine how many calories are needed to change 100g of solid x at 10degrees celcious to a vapour at 210degrees celcious:thermodynamic constants for substance x: heat of fusion 40,0cal/g heat of vaporization 150,0cal/g melting point 10,0'c ...

Pre Calculus 1
thirty percent of a radioactive substance decays in four years. assuming the decay is exponential, find the half life of the substance. the beginning of 1975 the population of a country was 40 million and growing at a rate of 3% per year. Assume that the growth is exponential...

Chemistry
A 0.120 g sample of a diprotic acid of unknown molar mass is dissolved in water and titrated with 0.1218 M NaOH. The equivalence point is reached after adding 12.4 mL of base. What is the molar mass of the unknown substance?

Chemistry
Calculate the standard enthalpy change for the reaction 2A+B⇌2C+2D Use the following data: Substance ΔH∘f (kJ/mol) A -251 B -403 C 213 D -511 My thoughts: [(2)(-511)+(213)(2)]-[(2)(-251)+(-403)]=​309kJ (but apparently that is not the correct answer) What...

Chemistry Dr. BOB
In many residential water systems, the aqueous Fe3+ concentration is high enough to stain sinks and turn drinking water light brown. The iron content is analyzed by first reducing the Fe3+ to Fe2+ and then titrating with MnO4- in acidic solution. Fe2+(aq) + MnO4-(aq) ? Mn2+(aq...

math
In a science experiment, the temperature of a substance is changed from 42°F to -54°F at an average rate of -12 degrees per hour. Over how many hours does the change take place? **Write as an expression and solve THANK YOU!

AP Chemistry
Hey guys! I have answers, but am confused. Please and thanks for any help! A) Which of the following is false? 1.A spontaneous change occurs by itself without assistance. 2.The greater the statistical probability of a state, the greater is its entropy. 3.A non-spontaneous ...

Chemistry
Oganic solvents are not suited to be heated with one of the followings: Oil Bath Electric hot plate Water bath Bunsen burner flame 2 Which of the following is not an inflammable liquid ? Water Ethanol Kerosine Benzene 3 These are some safety precausions necessary in a ...

Chemistry
an object with a mass of 24g and a volume of 32ml is most likely what substance

chemistry
Can a substance,that cannot be electrolysed,conduct electricity?Why?

math with application
If 12 % of a radioactive substance decays in 7 hours, what is the half-life of the substance? Carry out all calculations exactly, then round the final answer to three decimal places. The half life is what hours?

science
is tap water a pure substance..?

English Comp.
(1) After Sean was arrested for breaking into a pawnshop, I began to wonder. (2) Why did some kids from my neighborhood end up in trouble while most of us didn't? (3) I started out with a question: What causes young people to make bad choices? (4) Now, after two years of ...

phyical science
Which of the following is NOT a pure substance? A. milk B. oxygen C. water D. carbon dioxide

Organic Chemistry
Simple Distillation: What is the molar composition of the vapor in equilibrium with a boiling liquid that has a composition of 60% A and 40% B? I know that the vapor should be richer in the lower-boiling substance, which is A in this case. And: If a sample of the vapor has the...

Science
The half life of Uranium-238 against alpha decay is 4.5*10^9 years.Calculate the number of disintegrations taking place in 1gm of the substance.

Chemistry
A certain substance undergoes decomposition by a first-order reaction which has equal to 30.0 minutes. If the initial concentration of the substance is 1.28 mol/liter, what will its concentration be after 2.50 hours? 1. 0.36 M 2. 0.040 M 3. -0.32 M 4. 0.020 M 5. 0.16 M 6. None...

chemistry
consider the following reaction Ca + 2HCI CaCl2 +h2 identify the substance that is oxidized identify the substance that is reduced identify that is oxidizing agent identify the reducing agent

Chemistry
4.760 g of a substance (containing only C, H, and O) is burned in a combustion analysis apparatus. The mass of CO2 produced is 1.276×101 g, and the mass of H2O produced is 3.134 g. What is the empirical formula of the compound? I keep getting CH5O2, which is incorrect!

chemistry
Predict which pure substance has the following chemical and physical properties: white solid at room temperature, high melting point, soluble in water, highly conductive when dissolved in water, reactive with acids, and high pH. A) zinc oxide B) sodium hydroxide C) molecular ...

Government
I don't know im just confused how this question relates to government. Which of the following would a political party consider a “quality” candidate for national office? Question 3 options: A) An unknown mayor from Alaska. B) A self-employed computer hacker. C) A reality ...

Chemistry
Suppose water contained some harmful volatile substance. How could you easily remove the volatile substance in a laboratory?

Algebra
Each ounce of a substance A supplies 2% of the nutrition a patient needs. Substance B supplies 10% of the required nutrition per ounce, and substance C supplies 16% of the required nutrition per ounce. If digestive restrictions require that substances A and C be given in equal...

Algebra
If 18g of a radioactive substance are present initially and 8 yr later only 9 g remain, how much of the substance will be present after 20 yr?

Chemistry 2
Given the following information at 25C, calculate G at 25 degrees Celsius 2A(g)  B(g) ±£ 3C(g) Substance Hf  (kJ/mol) S(J/molK) A(g) 191 244 B(g) 70.8 300 C(g) -197 164 a. -956 kJ b. 956 kJ c. 346 kJ d. 346 kJ e. -1.03 * 10^3 kJ

Chemistry Help!
When C2H4O2 burns in oxygen, the products are carbon dioxide and water. How many grams of water are obtained from burning 4.76 g of this substance? How would I solve this problem?

ME
Problem 3: Consider water as the substance. (a) Find the specific internal energy (Btu/lbm) when T = 500F and P = 375 psia (b) Find the pressure (psia) when T = 500F and v = 0.02024 ft3/lbm (c) Find the specific volume (ft3/lbm) when T = 500F and h = ...

Biology
Substance X is converted to substance Y in a chemical reaction. What role would a catalyst play in this scenario? A. It would increase the solubility of substance X into the solvent needed to speed up the reaction. B. It would speed up the reaction by becoming part of the ...

chemistry
Oganic solvents are not suited to be heated with one of the followings: Oil Bath Electric hot plate Water bath Bunsen burner flame 2 Which of the following is not an inflammable liquid ? Water Ethanol Kerosine Benzene 3 These are some safety precausions necessary in a ...

chemistry
1 In the reaction of potassium permanganate and iron salt in acidic medium, how many moles of manganese reacted with iron? 2 moles of Mn with 1 mole of Fe 1 mole of Mn with 5 moles of Fe 1 mole of Mn reacts with 1 mole of Fe 5 moles of Mn reacts with 1 mole 2 Which of the ...

chemistry
When chemicals pour on the skin, the laboratory first aid is to ---------------. Apply 1% sodium carbonate Apply 1% boric acid solution Flush the eye with a copious amount of clean lukewarm running water Wash with soap and warm water 2 For cut sustained in the laboratory ...

College Chemistry
A 43.70 g sample of a substance is initially at 24.7 °C. After absorbing 1757 J of heat, the temperature of the substance is 120.5 °C. What is the specific heat (c) of the substance?

Chemistry2
A student pours 200 grams of methanol, a flammable substance into the sink. Another student causes the bad situation to get evern worse by dropping a lit match into the sink. The methanol burns completely with 300 grams of oxygen from the air. What mass, in grams, is converted...

life orientation
Examine how each of the following are responsible for road accidents and propose practical solutions by the community to the competence of the drivers,substance abuse,pedestrians,cyclists and livestock

Chem
A carless chemistry student pours 200 grams of methanol, a flammable substance into the sink. Another careless chemistry student causes the bad situation to get even worse by dropping a lit match into the sink. The metanol burns completely with 300 grams of oxygen from the air...

science
the spectator ions of all substance that are soluble of the reaction

math calculus
Find the half-life (in hours) of a radioactive substance that is reduced by 30 percent in 40 hours.

Chemistry
What can be said about a substance with a triple point above 1atm 1) The liquid state of the substance cannot exist. 2) The gaseous state at 1 atm pressure cannot be condensed to the solid at the triple point temperature. 3) The melting point of the solid must be greater than ...

physics
A person hammered a 0.5 kg something (substance ) with a hammer that its weight is 2.5 kg , with the velocity 65 m /s ,, if one third of the hammer's energy turn into the internal energy to both of the substance and the hammer , then what is the change (increasing ) internal ...

chemistry
1 A metal X that raects with metal Y in a solution of Y but does not react with Z in a solution of Z means that --------------. Metal Y is the least reactive Metal X is the least reactive Metal Z is the least reactive Metal Y and metal Z have equal reactivity 2 Oxidation can ...

chemistry
1 In the reaction of potassium permanganate and iron salt in acidic medium, how many moles of manganese reacted with iron? 2 moles of Mn with 1 mole of Fe 1 mole of Mn with 5 moles of Fe 1 mole of Mn reacts with 1 mole of Fe 5 moles of Mn reacts with 1 mole 2 Which of the ...

chemisrty
1 When chemicals pour on the skin, the laboratory first aid is to ---------------. Apply 1% sodium carbonate Apply 1% boric acid solution Flush the eye with a copious amount of clean lukewarm running water Wash with soap and warm water 2 For cut sustained in the laboratory ...

Physics
The relative density of a solid is 6.5. Find (1)the mass of a solid substance cube of side 20cm. (2) the volume of the substance if the mass is 1.3kg

College Algebra
A radioactive substance decays in such a way that the amount of mass remaining after t days is given by the function m(t) = 9e−0.012t b) How much of the mass remains after 49 days? (Round your answer to one decimal place.)

Math
the half life of a radioactive substance is one day. You have 100 grams. how much of the substance would be left after a week?

College Algebra
A radioactive substance decays in such a way that the amount of mass remaining after t days is given by the function m(t) = 9e−0.012t where m(t) is measured in kilograms. (a) Find the mass at time t = 0.

science
water has a density of 1.0 g/ml, and a test liquid has a density of 1.1 g/ml. If you pour equal portions of the two liquids into a cup,what will happen(assuming that the substance do not mix or create a chemical reaction

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