Identify the numbers in each of the following statements as measured or exact:a. There are 31 students in the laboratory.b. The oldest known flower lived 1.20 * 108 yr ago.c. The largest gem ever found, an aquamarine, has a mass of 104 kg.d. A laboratory test shows a blood cholesterol level of 184 mg/dL.

Q: Explain how you determine the volume of an irregular solid.

A: To Explain: How to find the volume of an irregular object or solid.

Q: By definition, all atoms of carbon have exactly 6 _________, but the number of _________ varies from…

A: Carbon is an element in periodic table. It has the atomic number of 6. Carbon is a nonmetal with…

Q: 9. Who discovered optical activity? a) J. H. van't Hoff b) J. A. LeBel c) L. Pasteur d) Kekule

A: The characteristic of a molecule due to which it is able to rotate the plane-polarized light is…

Q: The radioactive element carbon 14 has a 1/2 life of 5750 years a scientist determined that the bones…

A: let assume the initial concentration of C-14 as Co=100%

Q: Identify the estimated digit and the magnitude of uncertainty in each of the following measurements.…

A: Identify the estimated digit and the magnitude of uncertainty in each of the following measurements.…

Q: Which of the following is a characteristic of all nonmetals ?   Group of answer choices:   a. always…

A: Based on their properties elements can be classified into three types  Metals  Non metals…

Q: A brain scan uses the radioisotope oxygen-15. The recommended dosage is 50 mCi . A supply of 230 mCi…

A: Recommended dosage = 50 mCisupply of 250mCi correspond to 40ml

Q: The radioactive element carbon 14 has a 1/2 life of 5750 years a scientist determined that the bones…

A: According to the question, the radioactive element C has half life of 5750 years.  Lost percentage…

Q: Write the symbols for the following elements:a. oxygen            b. lithium            c. uranium…

A: The arrangement of elements in the tabular form according to the property of increasing order of…

Q: MCQ 19: Particular element posses the same number of electrons hence have the same A. chemical…

A: Interpretation -  For a particular element posses the same number of electron then having the which…

Q: anta has 8 reindeer. How many significant digits are there in this umber? elect one: D a. 0 O b. 1…

A: Number of reindeer Santa have = 8

Q: 12. How many protons, neutrons, and electrons are in the following? a. 1 atom of iodine-127 b. 1…

A: Since we know that  Atomic number = number of proton  Mass number = number of protons + number of…

Q: Which of the following is not an element? O A. Ammonia O B. Silver O C. Aluminum D. Magnesium O E.…

A: A substance that cannot be broken down into simpler substances by chemical means. An element is…

Q: The archeologist collected a sample for testing and learned that the carbon-14 activity was found to…

A:

Q: On a sheet of paper, Illustrate the history of the atom. Indicate the scientist's name, the Time…

A:

Q: So why do we use counting words instead of numbers?

A: Counting words instead of numbers have either advantages or compulsions.  Counting words like pairs,…

Q: Which group of substances contains only elements?   A. salt, copper, aluminum   B. silicon,…

A: There should not be any mixture or molecule or compound in the option.

Q: MCQ 38: Layers of rock under the surface of the carth is present in A. water B. calcium C. crude oil…

A:

Q: Write the symbol of each of the following in the form X a. Carbon-14 b. Chlorine-37 c. Potassium -…

A: The isotopes given are,

Q: Select the correct number of electrons, protons, and neutrons in 25Mg+2 A. 13,12,12 B. 14,12,13 C.…

A: The question is based on concept of atomic structure. we have to write proper electronic…

Q: What career did benjamin franklin learn from his brother

A: Benjamin Franklin was introduced to the art of printing and journalism by his brother James. He…

Q: The car is in motion. a. Newton's First Law Newton's Second Law Newton's Third Law

A: (a.) Newton's first law Newton's first law states that, If a body is at rest or moving at a constant…

Q: If the bottom of the meniscus is on a line, the estimated digit is a OA.O OB. 1 OC. 2 OD.3

A: The curved liquid surface in a tube or cylinder due to surface tension is called a meniscus.A…

Q: Which of the following observations is quantitative in nature? Choose one or more. A. The material…

A: Qualitative analysis: It is the determination of the chemical composition of a sample. Quantitative…

Q: Which of the following measurements has the highest uncertainty? a. 157. 67 b. 340 c. 190 d.…

A:

Q: MCQ 25: Fireworks release energy in the form of A. heat B. light C. sound D. all of above

A: We know that,. Firework happen then three phenomena appear, 1)Heat 2)Light 3)Sound

Q: How would I figure out this problem: A distance of 1.8 x 10^-2m is equal to : A. 0.18 meters B. 1.8…

A: Given,Distance = 1.8*10-2m

Q: How do I find the atomic number (This is bio and chem class)

A: Atom is smallest  unit of matter  and it forms chemical element.

Q: 206 Po? the number of protons is the In number of neutrons is and the number of electrons is

A: The atomic number of Po is 84. The given species has charge of 2- which shows that it has 2 extra…

Q: Select all of the answers that describe an unstable nucleus: (this is a multiple select question,…

A: Atoms contain protons ,neutrons and electrons. Protons are positively charged particles and…

Q: Marie Curie is famous for her study of:  a. hydrogen b. electricity c. radiation d. magnetism

A: Marie Curie was a Chemist and Physicist. She won nobel prize for the discovery of Polonium and…

Q: The numbers of protons, neutrons, and electrons in the 23 Na isotope, respectively, are: 11 اختر…

A:

Q: 3.What is a disadvantage of nuclear energy generation? One answer only. A.Nuclear power plants…

A: Nuclear energy is a source of energy used to generate electricity produced as a result of nuclear…

Q: The radioactive element carbon 14 has alha life of 5750 years a scientist determined that the bones…

A: The given data is as follows: The half-life of radioactive element carbon t12= 5750 years The age of…

Q: 1. Which is the smallest particle of matter? A. Cell B. Atom C. Molecule D. Compound 2. Which of the…

A: Note: Since you have posted a question with multiple subparts, we will solve the first three…

Q: Calculate the number of protons, neutrons, and electrons in: a. Ba b. Po C. £Cd Calculate the number…

A:

Q: How many protons, neutrons, and electrons are present in a singleatom of:a. phosphorus-30 b.…

A: (a) Since the atomic number of phosphorus = 15  Hence number of electrons = Atomic number = 15   And…

Q: change as the volume 5. Which of the options below share the same exte A. 50 kg of concrete. 50 m³…

A: In structure of atom, there is nucleus present inside the atom and electrons are revolving around…

Q: Which of the following is the type of particle that almost never interacts with normal matter?   a.…

A: In this question, we have to find out the correct answer of given problem by the help of the…

Q: D. Choose and draw the elements that will be characters of your cartoons. Show how these elements…

A:

Q: 27 Al 3t 13   what is the number of proton neutron and electron

A: Given, the element is 13Al27.

Q: 1. Ms. Smith left the ice cream out long enough that it melted. She wasn't concerned though as she…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: What is the weight of Amphotec®, an antibiotic preparation for aspergillus infection, necessary for…

A: Given that : Mass of the patient = 135 lbs = 1352.205=61.22 kg   (Since 1 kg = 2.205 lbs) The rate…

Q: Which of the following is not a radioactive element? a. Plutonium b. Thorium C. sulphur d. Uranium

A: The radioactive elements are those which have unstable nuclei and give off atomic radiation to gain…