Classify each of the following as an atom, a compound, or a molecule: the smallest possible “piece” of gold (Au) the smallest possible “piece” of quartz (SiO2) water (H2O) what a molecule of CO2 is made of hydrogen gas (H2)

QUESTION POSTED AT 06/12/2019 - 10:28 AM

Answered by admin AT 06/12/2019 - 10:28 AM

Gold is an atom, quartz is a compound, water is a molecule, CO2 is a molecule, H2 is a molecule.
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Related questions

Choose the correct order of classifying organisms in the Linnaean system. kingdom→phylum→ class→ order→ genus→ family → species kingdom→phylum→class→order→family→genus→species species→order→family→genus →class →phylum→kingdom

The correct way to classify organisms is as follows :Kingdom, such as Eukaryote, Phylum such as Animalia, Phylum such as Chordata, class, order, genus and family are mostly used for classification purposes in taxonomy and species, such as Oreochromis mossambicus, which is the mozambique tilapia.

ANSWERED AT 18/01/2020 - 07:25 AM


QUESTION POSTED AT 18/01/2020 - 07:25 AM

A student was given a task to observe a bacterial specimen made from dilute yogurt and sketch the shape of bacteria seen. he drew circular shapes. what kind of bacteria could these be?

The answer is cocci.

There are three basic types of the shape of bacteria:
- Cocci - spheres,
- Bacilli - rods,
- Spirochetes - spirals.

If a student drew a circular shape, this probably represented sphere. Therefore, the shape of seen bacteria was spherical which suggests that the bacteria must be cocci.

ANSWERED AT 18/01/2020 - 07:08 AM


QUESTION POSTED AT 18/01/2020 - 07:08 AM

Which does not describe the relationship between the nucleus and the electron cloud of an atom

The one that does not describe the relationship between the nucleus and the electron cloud of an atom would be : the mass of  the nucleus and electron cloud are balanced.

Ie : The mass of nucleus and electron cloud are always differ from one another

hope this helps

ANSWERED AT 18/01/2020 - 07:07 AM


QUESTION POSTED AT 18/01/2020 - 07:07 AM

Which of the following properties of carbon give it particular importance to life? It's very cohesive and adhesive. It can form polymers like carbohydrates, lipids, proteins, and nucleic acids. It can regulate temperature. Decomposition of molecules can occur readily, releasing needed energy.


It can form polymers like carbohydrates, lipids, proteins, and nucleic acids.

Carbon is one of the most prominent element that exist within biomolecules which serves as the sources for energy and other cellular activities for an organism to survive. Additionally, when these carbo, lipids, proteins and nucleic acids form they require carbon atoms. 

ANSWERED AT 18/01/2020 - 06:58 AM


QUESTION POSTED AT 18/01/2020 - 06:58 AM

Biologists use ball-and-stick models to study complex molecules by representing atoms with balls and bonds with sticks. DNA is a biological molecule that contains millions of atoms. What is a limitation of using a ball-and-stick model for DNA?

Most models can't incorporate all the details of complex natural phenomena. For example, when measuring distances around the Earth it's convenient to model the Earth as a sphere, but this doesn't incorporate variations in distance because of mountain ranges, valleys and other topological features the traveler must traverse. Incorporating these additional details would make the model too complex for easy use. Since models must be simple enough that you can use them to make predictions, they often leave out some of the details.

ALSO.

The conformation of molecules are based on probability. It fails to take into account the electronegativity of individual atoms. And it is ineffective in showing inorganic interactions with metals and such.

ANSWERED AT 18/01/2020 - 06:45 AM


QUESTION POSTED AT 18/01/2020 - 06:45 AM

When cells break down food molecules, energy is?

It is temporarily stored in ATP molecules

ANSWERED AT 18/01/2020 - 06:22 AM


QUESTION POSTED AT 18/01/2020 - 06:22 AM

Plants use pigments to collect or trap A)ATP. B)glucose. C)sunlight. D) water.

The answer is c. sunlight. when plants are making their food, they incorporate carbon dioxide, air and water from the soil. This process is called Photosynthesis The plant uses the sunlight's energy to create food. They are often trapped by the green pigment in the plant called chlorophyll.

ANSWERED AT 18/01/2020 - 06:18 AM


QUESTION POSTED AT 18/01/2020 - 06:18 AM

After population growth, what does the United Nations believe will be the greatest future global problem? a. lack of usable freshwater b. lack of arable land c. excessive levels of air pollution d. excessive water pollution

The answer is letter A) the lack of usable fresh water. Fresh water is very useful for us and to our growing population. It helps generate food, especially in the farming sector where plants rely on water and sun to thrive. If water starts to be scarce, draughts and famines are most likely to occur

ANSWERED AT 18/01/2020 - 06:14 AM


QUESTION POSTED AT 18/01/2020 - 06:14 AM

Water moves between the ocean, atmosphere, and land. In which form does water enter the atmosphere?Select one of the options below as your answer: A. Water in the form of droplets B. Water in the form of vapor C. Water in the form of ice

The answer is B.

Water in the form of vapor enter the atmosphere. The vapor accumulates in the atmosphere to form clouds. Once the clouds are heavy enough, the water in the form of droplets fall towards land or as rain. It could also be in the form of other precipitation such as snow or hail. As the sun hits the waters in the land, it causes the water to evaporate and the cycle continues.

ANSWERED AT 18/01/2020 - 06:10 AM


QUESTION POSTED AT 18/01/2020 - 06:10 AM

Which of the following practices that are needed to run a nuclear power plant has a negative impact on both air and water? a.cooling of the power plant b.mining of uranium c.storage of radioactive waste d.monitoring the reactor

The right answer for the question that is being asked and shown above is that: "c.storage of radioactive waste." The practice that are needed to run a nuclear power plant has a negative impact on both air and water is that c.storage of radioactive waste

ANSWERED AT 18/01/2020 - 05:59 AM


QUESTION POSTED AT 18/01/2020 - 05:59 AM

1. Excretion is the process of (1 point) exchanging carbon dioxide for oxygen. removing metabolic wastes from the body.*** pumping blood throughout the body to supply nutrients and oxygen to cells. breaking food down into nutrients that can be absorbed. 2. Kidneys that can conserve water are essential to homeostasis because (1 point) some animals live in dry or salty environments. some animals drink water. urea is not soluble in water.*** their cells will be unable to convert ammonia into urea if excess water is excreted. 3. Many freshwater invertebrates eliminate ammonia by (1 point) converting it to uric acid and eliminating it with solid wastes. simple diffusion across the gill membranes. converting it to urea and eliminating it in their urine. simple diffusion across the skin.*** 4. Which of the following excretory processes do saltwater and freshwater fishes share? (1 point) They both conserve water by producing small amounts of concentrated urine. They both actively pump salt across their gills.*** They both avoid drinking water. They both produce lots of watery urine. 5. What excretory characteristic does a garden spider share with a sparrow? (1 point) They both convert nitrogenous wastes to uric acid. They both produce lots of diluted urine.*** They both excrete very concentrated salt solutions. They both produce very dry feces.

The right answer for the question that is being asked and shown above is that: (1) removing metabolic wastes from the body; (2) urea is not soluble in water; (3) simple diffusion across the skin; (4) They both actively pump salt across their gills; (5) They both produce lots of diluted urine."

ANSWERED AT 18/01/2020 - 05:54 AM


QUESTION POSTED AT 18/01/2020 - 05:54 AM

Johannes wants to know whether soil, water, or both are needed for plant growth. He chooses to conduct experiments on a willow tree for five years to answer his question. How can his experimental methods be changed to improve his experiment?

Answer : He needs to use a larger sample size to improve his experiment.

Explanation : As Johannes wants to know whether soil, water, or both are needed for plant growth. He chooses to conduct experiments on a willow tree for five years. To get the improvement in his experimental methods he can choose a larger size of the sample and test its results. As larger size will allow him to gauge accurately on the smaller factors and results will be more reliable. Larger sampling will ensure the homogeneity of the test sample, which will yield better and reliable results.

ANSWERED AT 18/01/2020 - 05:53 AM


QUESTION POSTED AT 18/01/2020 - 05:53 AM

Which one of the following human organ systems is mainly made up of glands and hormones? Select one of the options below as your answer: A. Endocrine system B. Excretory system C. Nervous system

The correct answer is a. endocrine system

The endocrine system has a role of creating hormones inside of our bodies and encompasses all glands important for our inside well-being.

ANSWERED AT 18/01/2020 - 05:53 AM


QUESTION POSTED AT 18/01/2020 - 05:53 AM

What was the main function of the protocell’s fatty acid membrane? a.To allow sulfur dioxide to enter into the cell. b.To allow the cells to communicate with each other. c.To allow chemical compounds to enter into the cell.

Answer:

The correct answer is option c.

Explanation:

Protocells refer to the first cell-like compositions, which are generated by self-arrangement of macromolecules in the membrane-bound spheres known as microspheres that possess the tendency to differentiate and proliferate. The protocells comprise the RNA ribozyme and the fatty acid double membrane.  

The prime activity of protocell's fatty acid membrane was to permit the chemical compounds to get within the cell by membrane absorption so that the cells can grow and reproduce with the assistance of these organic components. Afterward these reproducible cells may get selected by natural selection, and they may develop to give rise to prokaryotic cells.  

ANSWERED AT 18/01/2020 - 05:53 AM


QUESTION POSTED AT 18/01/2020 - 05:53 AM

Because of biogeochemical cycling, A. human activity has no effect on elements, chemical compounds, and other forms of matter. B. living organisms are not limited by any one nutrient. C. nutrients are circulated throughout the biosphere. D. many nutrients do not reach toxic concentrations in the biosphere.

The right answer for the question that is being asked and shown above is that: "A. human activity has no effect on elements, chemical compounds, and other forms of matter." Because of biogeochemical cycling, human activity has no effect on elements, chemical compounds, and other forms of matter. 

ANSWERED AT 18/01/2020 - 05:50 AM


QUESTION POSTED AT 18/01/2020 - 05:50 AM

The fatty acids in the tail of a phospholipid molecule are?

Answer:

Nonpolar and Hyrdrophobic

ANSWERED AT 18/01/2020 - 05:49 AM


QUESTION POSTED AT 18/01/2020 - 05:49 AM

An enzyme is which of the following? A- an acid B- an amino nucleotide C- a biological catalyst D- an atom

The answer is C: a biological catalyst

ANSWERED AT 18/01/2020 - 05:38 AM


QUESTION POSTED AT 18/01/2020 - 05:38 AM

What characteristic do the nucleus, the mitochondria, and the vacuoles of animal cells have in common? A. They all create energy while doing their tasks. B. They all contain some of the cell's DNA. C. They are all enclosed by membranes made of phospholipids. D. They are all involved in producing food for the cell.

The correct answer is (c,) They are all enclosed by membranes made of phospholipids. The nucleus, the mitochondria, and the vacuoles of animal all are enclosed by membranes that are made of phospholipids. That is what they all have in common.

ANSWERED AT 18/01/2020 - 05:37 AM


QUESTION POSTED AT 18/01/2020 - 05:37 AM

Which part of the root allows it to grow deep inside the soil in search of water?

The correct answer is root tip. The root tip is the part of the root that allows it to grow deep into the soil in search of water. The gravity is the force that allows the root tip to keep pushing in order for it to grow inside the soil.

ANSWERED AT 18/01/2020 - 05:35 AM


QUESTION POSTED AT 18/01/2020 - 05:35 AM

Which of the labeled structures controls the water balance in the paramecium?

The answer is contractile vacuole it pushes water out of the paramecium to maintain homeostasis

ANSWERED AT 18/01/2020 - 05:31 AM


QUESTION POSTED AT 18/01/2020 - 05:31 AM

When trees transpire, releasing gaseous water into the atmosphere, they can absorb heat from their environment and cool it down. What property of water is responsible for this activity? A) High heat capacity. B) High heat of vaporization. C) Adhesion.

As we already know the biosphere are all living things which include animals and plants. The Geosphere is all the solid earth parts like rocks, mountains, soils and landforms. The atmosphere are all the gases that surround our planet. The way the biosphere facilitates movement of water from the geosphere to the atmosphere is evaporation. The water evaporates from inside the soils through the vegetation and from the revers, lakes and oceans. This evaporated water accumulates as water vapor in the atmosphere and then comes back to the geosphere and biosphere.

Answer: B) High heat of vaporization.

I hope it helps, Regards.

ANSWERED AT 18/01/2020 - 05:21 AM


QUESTION POSTED AT 18/01/2020 - 05:21 AM

Why was modern classification invented? A: traditional classification could not classify all living things. B:scientists realized related organisms do not share similar characteristics. C: Scientists understood that species share a common ancestor. D: modern classification is faster and easier to use.

The correct answer is (c.) Scientists understood that species share a common ancestor. Scientists considered making a modern classification of an organism in order to organize in which these organisms belong to what ancestors. The Modern Taxonomy is the one responsible for classifying each organism.

ANSWERED AT 18/01/2020 - 05:15 AM


QUESTION POSTED AT 18/01/2020 - 05:15 AM