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Homework Help: Science: Scientists

Recent Homework Questions About Scientists

Science
1. The current atomic model would be revised if 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...

history
1. What is allocation by need? (1 point) pricing goods based on want rather than need giving or selling goods only to people who most need them giving or selling goods to whoever will stand in line the longest pricing goods so that even the most vulnerable members of society ...

Chemistry
A scientist studying the reaction between decaborane (B10H18) and oxygen mixed 1.00 x 10^2 grams of decaborane with 2.75 x 10^2 grams of oxygen. Compute the masses of all substance present after the reaction went ot completion, generating B2O2 and water as the only products.

Chemistry 2
A scientist studying the reaction between decaborane (B10H18) and oxygen mixed 1.00 x 10^2 grams fo oxygen. Compute the masses of all substances present after the reaction went to completion, generating B2O3 and water as the only products.

Chemistry
A forensic scientist is given a white substance that is thought to be cocaine. The substance is found to have a percent composition: 49.48% C, 5.19% H, 28.85% N, and 16.48% O. What is the empirical formula for this substance? Is it cocaine?

EMpirical and Molecular Formula
A forensic scientist is given a white substance that is thought to be cocaine. The substance is found to have a percent composition: 49.48% H, 5.19% H, 28.85% N, and 16.48% O. What is the empirical formula for this substance? Is it cocaine?

art
In what way is a conservator similar to a scientist? A:Both conservator and scientist relish doing research for extended periods of time. B:a conservator experiments with conservation materials just as a scientist experiments with different hypothesis. C:conservators and ...

science
The work of which scientist(s) helped to explain light's ability to propagate through a vacuum? A. Maxwell ==B. Davisson and Germer C. Fresnel, Fraunhofer, and Arago D. Newton An object that has a height of 0.4 meter is placed at a distance of 0.7 meter from a concave ...

Physics
Could you please check these? The work of which scientist(s) helped to explain light's ability to propagate through a vacuum? ++A. Maxwell B. Davisson and Germer C. Fresnel, Fraunhofer, and Arago D. Newton An object that has a height of 0.4 meter is placed at a distance of 0.7...

chemistry
Robin the Research scientist prepares 100 mLs of a solution of 100 mM of Tris HCl. What is the pH? and part two for this question Calculate the pH when the scientist adds 100 ul of 50% NaOH

Chemistry
Robin the Research scientist prepares 100 mLs of a solution of 100 mM of Tris HCl. What is the pH? and part two for this question Calculate the pH when the scientist adds 100 ul of 50% NaOH I am confused since we do not know the conjugate base concentration so how to solve for...

Chemistry
Robin the Research scientist prepares 100 mLs of a solution of 100 mM of Tris HCl. What is the pH? I am confused since we do not know the conjugate base concentration so how to solve for the pH

Science
By using different types of technology like satellites, radar, and river gauges, scientist can reduce flood damage and loss of life A:Models B:Automated weather systems C:Nonpoint sources D:Advanced warnings I think the answer is D. Thank you for your help.

english
(b) Choose two of the scientists you read about in the Stories of Scientists unit. Compare and contrast these scientists. Answer this question in no fewer than two paragraphs. Be sure to include specific details about each scientist’s life, career, and personality in your ...

science questions please answer at least 45minutes
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
A scientist observes two colonies of bacteria. The first grows at a rate of 2.2 x 10^6 bacteria per hour. The other grows at a rate of 6.3 x 10^5 bacteria per hour. Which grows faster? How do you know?

science
If a scientist wished to to determine the effect of a certain herbicide on wee growth he would include a control in the investigation. Suggest a suitable control in this case.

MATH
A scientist needs 80 liters of a 30​% acid solution. He currently has a 20% solution and a 60% solution. How many liters of each does he need to make the needed 80 liters of 30​% acid​ solution?

Algebra 1 Please help
A scientist is studying the growth of a particular species of plant. He writes the following equation to show the height of the plant f(n), in cm, after n days: f(n) = 8(1.05)n Part A: When the scientist concluded his study, the height of the plant was approximately 11.26 cm. ...

Science
A scientist is studying a plant species in which the flower color genes are codiminant. The scientists crosses a plant with red flowers. The offspring will most likely have A. Red flowers B. White flowers C. Pink flowers D. Red flowers with white patches

spanish
what can scientist learn from studying the forest around the crater in the Poas Volcano?

U.s History
1.Which statement best describes an effect of William Penn's actions on colonial America? A)Cash-crop agriculture became more profitable in the Southern colonies. B)Many immigrants came to the Middle colonies seeking religious freedom.*** C)Several northern colonies decided to...

Science
What is a scientist who studies humans???

yhsh
A scientist determined that the bones from a mastodon had lost 79.579.5​% of their​ carbon-14. How old were the bones at the time they were​ discovered?

English
My answers are *** 10.   The author of “My Brother’s Keeper” emphasizes Jamie’s conflict by  (1 point) A. describing the car accident in detail. B. detailing Jamie’s physical appearance and good grades. C. flashing back to earlier events with his brother Ted.*** ...

Science
1.) Why is it important to have a quiet study space? It is easier to concentrate in a quiet space, and concentration is needed to learn. * It is easier to leave all your study material in a quiet study space so you can find it. A quiet study space prevents incorrect ...

science(check my answers)
1. Which of most likely to be a part of an ionic bond? A.an atom with no valence electrons b.an atom with one valence electrons** c.an atom with two valence electrons d.an atom with three valence electrons 2.to form oxygen molecule(02), two oxygen a share two pairs of ...

Science Check my work PLS
Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly**** Scientists use models of natural systems because they like to use art in science. ...

Science
How do scientist work

Please help do by 10:00 Science
1. Convert 4.0 kilometers (km) to meters (m). (1 point) 0.04 m 40 m 400 m 4,000 m 2. For his science project, Austin wants to determine if the pH of standing rainwater changes over time. He collects a jar of rainwater and places it indoors in a spot that does not receive a lot...

Science 7th Grade
How do i solve this. Atomic Theory Date (year) Name of Scientist(s) Contribution to the Theory Source 5th century BC Leucippus and Democritus They proposed that all matter is composed of tiny particles called atoms that can’t be split into smaller pieces and that attach to ...

ela
1. Which of the following is not part of the rising action in "Raymond's Run"? (1 point) A. Squeaky and Raymond confront Mary Louise and her friends on Broadway. *** B. Mr. Pearson hints to Squeaky that she should consider letting the new girl win. C. Squeaky is responsible ...

Language Arts
1. Which of the following is not part of the rising action in "Raymond's Run"? (1 point) A. Squeaky and Raymond confront Mary Louise and her friends on Broadway. B. Mr. Pearson hints to Squeaky that she should consider letting the new girl win. C. Squeaky is responsible for ...

Chemistry
A scientist used 21.0g of NaHCO3. How many miles of NaHCO3 were in this sample?

Sciences
scientist are often eager to learn more about the world around them. what is this attitude called? Curiosity •• Honesty Creativity Ethics

Science
Q1: Why do scientist use models? A.) Scientist use models to learn about things that are too small, too late, or too complex to observe directly. B.) Scientist use models because doing so is always part of the scientific method. C.) Scientist use models because they always ...

8th Grade Science
Why do scientist use standered units of measurements? A.) Because their tools only measure in units B.) Because their units are either too small or too large to work with C.) So they can communicate findings without confusion D.) So that people who are not scientists can ...

Check answer for la please!!
In which sentence is the word periscope used correctly? A. Excited about her finding, the scientist used a periscope to view the organisms in the water sample. B. On the night of the full moon, we used the periscope to look at the sky. C. Sitting behind the tall stone walls, ...

SCIENCE
1. WHICH OF THE FOLLOWING IS MOST LIKELY TO RESULT IN A SCIENTIST DRAWING WRONG CONCLUSIONS? A. CONDUCTING A DOUBLE-BLIND TEST B. CONDUCTING A CONTROLLED EXPERIMENT C. PREVENTING OPINIONS FROM AFFECTING DATA COLLECTION D. GATHERING DATA FOR A BRIEF PERIOD OF TIME D

geometry
A cylindrical beaker has a height of 5 inches and a volume of 63 cubic inches. A scientist pours a chemical from the beaker to a similar beaker with a height that is 100% greater. What is the volume of the larger beaker?

Science
A scientist studying the effects of gamma rays on marigolds gathered the data shown below. Hypothesis: Marigolds exposed to higher levels of radiation will not grow as well as marigolds that are exposed to less radiation Plant A: Gamma Rays (Rad/day) is 5. Water (mL/week) 50. ...

Science
which of the following describes scientific inquiry? (1 point) a statement that describes what scientists expect to happen in an experiment facts, figures, and other evidence gathered through observation the diverse ways in which scientists study the natural world a well-...

Science
Why might a scientist estimate a measurement?

College Chem.
A scientist adds 1.00 moles of phosphoric acid to a liter of water to make a solution. How many moles of NaOH should be added to ensure that the concentration of H2PO4- is equal to three times the concentration of HPO42? Remember that H3PO4 is a triprotic acid. I don't even ...

Science
3. Which of the following small bodies are the hardest to tell apart because they are made of similar materials? dwarf planets and comets asteroids and comets comets and meteoroids asteroids and meteoroids** A scientist examines a sample of an object from the solar system. ...

Math
If a substance has a half life of 600 seconds. If a scientist begins with an initial amount of 1kg complete the following problems: create an exponential equation using proper variables?

life sciences
Formulate a hypothesis for this investigation? A scientist used biotechnology to clone a cow.over a period of 10 days the clones were monitored carefully and the number of the survived clones were notated.the line graph below presents the results of the survival rate.

Science
Name two types of evidence used to support the theory if evolution. Explain how scientist use each type of evidence to provide support for evolution. Give one example of each

Chemistry
As an eager scientist on a hot summer day you wish to determine how much ice to buy to add to your cooler which is filled with 4.0 × 101 cans of soda which are warm at 82.9°F. Each can has a mass of 378 g and ideally you want the temperature of the drinks to be 40.1°F. If ...

Sri sankara global academy/ Chemistry
A food scientist also tested some ethanoic acid solution. Ethanoic acid is the acid which is found in vinegar.His results are shown below. vinegar ethanoic acid Volume used/Cm3 50 10 volume of NaOH needed to neutralise/cm 30 10 The ethanoic acid solution contained 10 g of acid...

science help please
1. Which of the following best describes the movement of an object at rest if no outside forces act on it? (1 point) It will move due to inertia. Gravity will eventually cause it to move. It will stay at rest due to inertia. It will stay at rest due to gravity. 2. A 2,500 kg ...

Science
1. Which of the following best describes the movement of an object at rest if no outside forces act on it? (1 point) It will move due to inertia. Gravity will eventually cause it to move. It will stay at rest due to inertia. It will stay at rest due to gravity. Physics 2. A 2,...

About Drama
1. Which of these sentences is using appositive phrase correctly? a. The Grand Canal, which is the oldest man-made waterway in the world, is still used today in China. **?? b. The Grand Canal in China is a man-made waterway, still used, that is the oldest in the world. c. The ...

All about DRAMA! P.S. - Please check!
1. Which of these sentences is using appositive phrase correctly? a. The Grand Canal, which is the oldest man-made waterway in the world, is still used today in China. b. The Grand Canal in China is a man-made waterway, still used, that is the oldest in the world. c. The Grand...

Math
A scientist is working with 17 meters of gold wire how long is wire in millimeters

math
A scientist identifying cacti in a certain area of the Mojave Desert has found 46 prickly pears and 76 other cacti so far. What is the experimental probability that the next cactus identified will be a prickly pear? Simplify your answer and write it as a fraction or whole number.

HISTORY
Greek educators, religious reformers,scientist of intellectual revolution, political philosophers constructed the door through when the pilgrims entered the new world when they arrived. [Critically analyze] who are the Greek educators? who are the religious reformers ? who are...

science
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...

science help
A scientist uses a computer model to understand a widely accepted theory about Earth's surface. The computer model would most likely help the scientist to... A. reduce the intensity of earthquakes B. discover new facts about the theory C. stop the creation of faults during ...

science help
A scientist plans to find out the percent of teenagers who like science. She interviews 500 teenagers leaving a science museum and finds that 450 of them like science. The scientist concludes that 90 percent of teenagers like science. Why is the scientist's conclusion most ...

algebra
A research scientist measures the outside temperature, in degrees Fahrenheit, at various times throughout a 24-hour period and records her findings in the graph below. In this real-world function, the hours represent the input values, and the temperature represents the output ...

science/bioligy
How would a scientist use DNA or protein sequences from three different organisms to construct a cladogram? need help!!! how do I do this??

science/biology (cladogram)
How would a scientist use DNA or protein sequences from three different organisms to construct a cladogram? don't understand this how do I write this???? help!!!!

Chemistry
An atmospheric scientist interested in how NO is converted into NO2 in urban atmospheres carries out two experiments to measure the rate of this reaction. The data are tabulated below. A: [NO]0 = 9.63 × 10-1 M, [O2]0 = 4.1 × 10-4 M t(s) 0/3.0/6.0/9.0/12.0 [O2] 4.1/2.05/1.02/...

Earth science
A scientist wants to determine the age of a rock. The rock contains an index fossil and an ancient relative of a living organism. Which is more useful for dating the rock, and why? Answer: an ancient relative of a living organism would be more useful for dating the rock ...

Science
Which statement best describes the Richter scale? A. It's named after a scientist who studied tornadoes. (B. It's a numerical rating system that measures the largest seismic waves during an earthquake.) C. It's a numerical system that measures the smallest seismic waves during...

PLEASE CHECK IF THEY ARE CORRECT!!! THANKS
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromosphere*************** Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and ...

Science
How do you think a scientist might figure out a person’s identity from bones? My answer I think that depending on the shape and size of the bones are different for every person like you DNA. This is how they know who you are. it is also possible that your bones carry DNA or ...

Math
1. Doug earns $10.50 per hour at a restaurant. On Friday, he's been 1 3/4 hours cleaning, 2 1/3 hours doing paperwork, and one 512 hours serving customers . What were dougs earning? 6. Salid bought 35 feet of window trim at a hardware store. The trim it cost $1.75 per foot, ...

Science
Miss sue can you check these thanks. which of the following describes scientific inquiry? (1 point) a statement that describes what scientists expect to happen in an experiment facts, figures, and other evidence gathered through observation the diverse ways in which scientists...

Science
1.which of the following describes scientific inquiry? (1 point) a statement that describes what scientists expect to happen in an experiment facts, figures, and other evidence gathered through observation the diverse ways in which scientists study the natural world a well-...

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...

Science
1.What information would a scientist need to discover whether a disorder had a genetic cause, an environmental cause, or a combination of the two? 2.How do mutations affect an organism? Why can some mutations have no effect? 3.Which of these traits or behaviors is most likely ...

HELP_ME_PLEASE_VERY FAST
1.What information would a scientist need to discover whether a disorder had a genetic cause, an environmental cause, or a combination of the two? 2.How do mutations affect an organism? Why can some mutations have no effect? 3.Which of these traits or behaviors is most likely ...

Science
What information would a scientist need to discover whether a disorder had a genetic cause, an environmental cause, or a combination of the two?

science
What information would a scientist need to discover whether a disorder had a genetic cause, an environmental cause, or a combination of the two?

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 ...

Science
Imagine that the label on a sunscreen product reads, “Recommended by nine out of ten doctors.” No other information regarding this claim is provided. Why would a scientist tell a consumer to be wary of this statistical claim? A. Sunscreen products are ineffective. B. The ...

biology help please :)
Two chemists measure the densities of an unknown metal sample. They both find that the sample has a density of 8.94 g/mL. Chemist A uses a chart and says that the metal must be copper since the density of copper is exactly 8.94 g/mL. Chemist B says that the metal could be a ...

Math
1.A scientist is studying the growth of a particular species of plant. He writes the following equation to show the height of the plant f(n), in cm, after n days: f(n) = 12(1.03)n Part A: When the scientist concluded his study, the height of the plant was approximately 16.13 ...

Math
1.A scientist is studying the growth of a particular species of plant. He writes the following equation to show the height of the plant f(n), in cm, after n days: f(n) = 12(1.03)n Part A: When the scientist concluded his study, the height of the plant was approximately 16.13 ...

Science
1.)TRUE OR FALSE: Scientific investigations involve testable questions. * True False 2.)Which of the following would not be a reliable place to find research for a scientific investigation? * science journals experts wikipedia textbooks 3.)Why should a scientist reapeat an ...

math
a scientist dropped an object from a height of 200 feet. She recorded thee height of the object in 0.5 second intervals.

Science
Structure, Function, Information Processing Test: Unit2 1. Enzymes are important because they: contain water speed up chemical reactions***** contain genetic material help the cell maintain its shape. 2. Which term refers to the diffusion of water through a membrane? osmosis...

science
a scientist is trying to determine the identity of an element. it highly reactive in water and forms an ionic bond with chlorine. its very shinny. the element is likely? A) from Group 17 B) from group 1 C) from group 15 D) a noble gas

Biology Check my work please
The Hershey-Chase experiment proved that DNA was the hereditary material because. a) radioactive phosphorus in viral proteins was shown not to enter bacterial cells b) radioactive phosphorus in viral DNA was shown to enter bacterial cells **** (my choice) c) radioactive sulfur...

biology check answers please
The Hershey-Chase experiment proved that DNA was the hereditary material because. a) radioactive phosphorus in viral proteins was shown not to enter bacterial cells b) radioactive phosphorus in viral DNA was shown to enter bacterial cells **** (my choice) c) radioactive sulfur...

science help
One scientist discovered a new theory on the evolution of the universe. What is the next step for the scientist to take? A. transform the results of the theory into universal laws of nature. B. inform the scientific community so they can verify the results. C. call a press ...

algebra 1
A research scientist measures the outside temperature, in degrees Fahrenheit, at various times throughout a 24-hour period and records her findings in the graph below. In this real-world function, the hours represent the input values, and the temperature represents the output ...

Science
You are creating a carbon cycle poster. which object could you add to the image as another example of combustion of fossil fuels? A. the sun B.a buzzard eating a dead animal C.a person driving a car D.a scientist digging up fossils My answer is A is that correct

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromospheres Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and helium Hydrogen ...

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromospheres Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and helium Hydrogen ...

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromosphere*************** Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and ...

Science
How did the discovery of the electron change the atomic model? A.It disapproved the earlier idea of an invisible atom. B. It confirmed that atoms are very tiny C. it exposed fraudulent conducted by unqualified scientist D. It proved that atoms are easier to see than once ...

History
1.)Studies conducted in england during the industrial revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely expalanation for this difference in hieghts is a difference in A.)Nutrition B.)Family...

History
1.)Studies conducted in england during the industrial revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely expalanation for this difference in hieghts is a difference in A.)Nutrition B.)Family...

Science
1.)Studies conducted in england during the industrial revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely expalanation for this difference in hieghts is a difference in A.)Nutrition B.)Family...

science
Which of the following is an example of inbreeding? A) a farmer chooses the cos in his or her herd that produce he most milk and breeds only those cows. b) a farmer chooses the cows in his or herd that produces the most milk and breeds them with cows that get sick less often. ...

History
5.)What was the main effect of the 1763 Treaty of Paris A. France gained more Canadian territories. B. Spain lost all its holdings in North America C. Britain gained more land in North America D. Native Americans lost most of their tribal lands A.)France gained more ccanadian ...

Chemistry
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 550 mL of a solution that has a concentration of Na+ ions of 0.600 M ?

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Homework Help: Science

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