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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Algal blooms occur due to the presence of an excess amount of nutrients, like phosphorus, in fresh water. How does excess phosphorus get into fresh water? A) The nutrients are added to the water by fishermen to feed the fish. B) The nutrients leak into fresh water from oil refineries in the vicinity. C) The nutrients are a part of the fertilizers that are often washed away into ponds. D) The nutrients are formed by the decomposition of organic wastes dumped into fresh water.

The algal blooms can be defined as the rapid growth of the algae in the water bodies. These algal blooms are a result of the excess amounts of nutrients, such as phosphorus, in the water. These excess nutrients are released in the fresh water bodies as a result of the fertilizers that are washed away from the agricultural fields nearby. The fertilizers are rich in nutrients such as phosphorus to help the plant to grow. When they get washed into the water bodies, they promote the growth of the algae leading to algal bloom.

Hence, the correct answer is 'Option C - The nutrients are a part of the fertilizers that are often washed away into ponds'.

ANSWERED AT 01/04/2020 - 01:35 PM


QUESTION POSTED AT 01/04/2020 - 01:35 PM

Algal blooms occur due to the presence of an excess amount of nutrients, like phosphorus, in fresh water. How does excess phosphorus get into fresh water? A) The nutrients are added to the water by fishermen to feed the fish. Eliminate B) The nutrients leak into fresh water from oil refineries in the vicinity. C) The nutrients are a part of the fertilizers that are often washed away into ponds. D) The nutrients are formed by the decomposition of organic wastes dumped into fresh water.

Answer: Option C

Explanation:

The nutrients that is carried away by the water from the agricultural wastes are part of the fertilizer that is put on to increase the growth of the plants.

The nutrients from the fertilizer is carried away by the water that passed from the field to the nearby freshwater source.

The water carries phosphorus which increases the growth of the algal bloom in water. The algae uses all the oxygen from the water and makes the water deficient of oxygen.

Hence, the correct answer is option C

ANSWERED AT 01/04/2020 - 01:30 PM


QUESTION POSTED AT 01/04/2020 - 01:30 PM

The density of aluminum is 2.70 g/ml. A piece of aluminum foil has a mass of 44 g. What is the volume of this piece of aluminum foil?

Density= mass/volume
2.70 = 44/ volume
44/2.70 = 16.2962963
The volume is 16.3

ANSWERED AT 01/04/2020 - 01:28 PM


QUESTION POSTED AT 01/04/2020 - 01:28 PM

(2006-27) Bivalves, such as clams, are found in salt water. The clam captures food particles from water that flows over its gills. Which of these is the best classification of the clam? a. A chunk feeder b. A decomposer c. A filter feeder d. A grazer

Answer:

c. A filter feeder

Explanation:

  • Filter feeders are those organisms that feed on the food particles by straining them from water and then taking them in.
  • The straining of water takes place through specialized structures which acts as filters.
  • Since in the given case, the bivalves are capturing the food particles that are flowing over their gills, they are performing filer feeding.

ANSWERED AT 01/04/2020 - 01:27 PM


QUESTION POSTED AT 01/04/2020 - 01:27 PM

What clastic rock consists of the smallest grain size?

I think that answer is clay (shale) then the second smallest is silt then the next or third smallest is sand then the next or fourth smallest is pebbels

ANSWERED AT 01/04/2020 - 01:18 PM


QUESTION POSTED AT 01/04/2020 - 01:18 PM

In the earliest stages of development the embryos of a fish, calf, human, and tortoise all look similar. In the next stage the fish looks the most different. What assumption can be made based on this different?

The correct assumption may be that the calf, human and the tortoise are more related to one another as compared to the fishes.

The embryology plays a very important role in determining the common ancestors in the organism. The organisms sharing similar embryological development are more closely related as compared to the others, which do not have the similarity in the embryogenesis. More closely related the organism, the more similar embryonic development would be. Hence, it can be said that the calf, human and the tortoise are closely related to one another as compared to the fishes.

ANSWERED AT 31/03/2020 - 10:43 AM


QUESTION POSTED AT 31/03/2020 - 10:43 AM

What is the differnece between carbon compounds and other compounds?

The presence of a carbon atom; organic compounds will contain a carbon atom (and often a hydrogen atom, to form hydrocarbons), while almost all inorganic compounds do not contain either of those two atoms.

ANSWERED AT 30/03/2020 - 01:31 AM


QUESTION POSTED AT 30/03/2020 - 01:31 AM

The amount of mass in a particular volume of water is _____. A. salinity B. density C. pressure D. temperature

I think the answer is b if you are smart you will go with b because the rest of the answer make zero sense.

ANSWERED AT 29/03/2020 - 06:27 PM


QUESTION POSTED AT 29/03/2020 - 06:27 PM

How can reduced precipitation lead to limited water availability

Answer:

        Let's think in Brazil as an example to answer this question, and the Amazon forest.

Explanation:

        The amazon forest is one of the biggest forests of the whole world, being responsible for a lot of the water distribution there is in Brazil due to a process called flying river. The water vapor that the trees in amazon produce is very high, we can check on that by seeing how the weather in this region works, it rains almost all the time, and then, this vapor water spreads across all the country and other countries too. If there's a problem in amazon such as fires and deforestation, the amount of water that is going to other regions of the country is less than before, and in that way, the water availability will not be enough anymore.

ANSWERED AT 29/03/2020 - 06:14 PM


QUESTION POSTED AT 29/03/2020 - 06:14 PM

Consider this northern site of primary succession following the retreat of a glacier. As we move from left to right, describe some improvements in the abiotic factors that support plant growth. A) change in climate over time B) less competition for water resources due to biodiversity C) improved soil quality: increased humus and water retention D) increased population density resulting in decreased pathogens

Answer: C. improved soil quality: increased humus and water retention.

Explanation:

An ecological succession brings change in the type of living species residing in an ecosystem with respect to changes that occur in the abiotic (non-living factors) with respect to time.

A region affected by a retreating glacier will not be suitable for the growth of living species. The soil may be lacking minerals and will be in the permafrost condition. So for the initiation of succession the improvement in soil an important abiotic factor is required. The improved soil quality will allow the accumulation of organic and inorganic minerals by physical and biological processes. This will help in formation of humus and water retention.

ANSWERED AT 28/03/2020 - 12:55 PM


QUESTION POSTED AT 28/03/2020 - 12:55 PM

What might happen if your body couldn't process glucose? A. You wouldn't be able to digest food B. You wouldn't have the energy you needed to function C. You would be more likely to catch diseases Or D. You would be constantly thirsty for water

B. you wouldn't have the energy to function
because glucose is a simple sugar that is an important energy source in living organisms

ANSWERED AT 28/03/2020 - 12:40 PM


QUESTION POSTED AT 28/03/2020 - 12:40 PM

A scientist wrote an article about a drug that he believes reduces the effects of viral infections. Which of these MOST LIKELY needs to be done by a scientific committee before the drug is made available to the general public? A) An experiment related to the drug but not about viral infections B) A review of the scientist’s credentials and a review of the article C) An experiment not related to the drug but about viral infections in general D) An experiment related to the drug and a review of the article written by the scientist

Answer:

The answer is d)An experiment related to the drug and a review of the article written by the scientist

Explanation:

A scientific committee will verify that the medication has been evaluated in its entirety before placing it at the disposal of the general public, and for this it should be verified that said medication is supported through scientific experimentation, which will help establish the nature between independent variables and dependents. In a controlled study of a drug, scientists conduct two or more experiments simultaneously: a treatment group, where the effect of manipulation on a dependent variable is analyzed, and a control group, in which the same conditions are used, to treatment exception.

ANSWERED AT 28/03/2020 - 12:28 PM


QUESTION POSTED AT 28/03/2020 - 12:28 PM

Which would be the best tools to measure the density of a small piece of silver ore

The best tools to measure the density of a small piece of silver ore is to use a graduated cylinder and a balance.

ANSWERED AT 28/03/2020 - 12:18 PM


QUESTION POSTED AT 28/03/2020 - 12:18 PM

Which types of molecules will easily pass through the fatty acid chains of the bilayer? Ions Hydrophobic Hydrophilic Polar

There are two important regions of a lipid that provide the structure of the lipid bilayer. Each lipid molecule contains a hydrophilic region, also called a polar head region.

ANSWERED AT 28/03/2020 - 12:06 PM


QUESTION POSTED AT 28/03/2020 - 12:06 PM

In a paragraph address these following questions: • How does an underwater earthquake cause a tsunami? • Why do some earthquakes cause more damage than others? the paragraph needs to also include the following things: • discuss how the different types of waves are formed and describe how the waves travel • explain how scientists use waves to track and analyze earthquakes • cover recent events involving earthquakes and/or tsunamis that illustrate the points made in your explanation

What is an Earthquake

Earthquakes are vibrations in the earth's crust They occur along all plate boundaries but are more destructive usually at destructive plate boundaries

How are they measured

The magnitude or size of an earthquake can be measured by an instrument called a seisometer and are shown on a seismograph. The earthquakes are measured on the Richter scale from a value of 1 to 10. Each level of magnitude is 10 times more powerful than the previous. Therefore a level 7 is 100 time more powerful than a level 5.

Why do some earthquakes cause more damage than others?

Some earthquakes take place in rural areas where few people live and little is damaged

If they occur near large urban areas with many people, transport services, large buildings and services such as gas and electricity - there can be a great amount of deaths and damage

In Poor countries - LEDC's they have poorly built buildings, few emergency facilities, and the equipment to help rescue people - a good term to use is that they have a poor infrastructure.

In rich countries - MEDC's such as the USA they prepare for an earthquake with drills and have a great deal of trained emergency personnel and equipment to go to help the injured. They also try to build to withstand earthquake damage - ie The Transamerica building

The time of day can be important - If the earthquake hits when it is the rush hour or when there is a large number of people located in a certain area - this can cause a great loss of life

Obviously if they occur near to coasts then Tsunamis can cause a great deal of damage and deaths such as the 2004 Boxing Day Tsunami

ANSWERED AT 28/03/2020 - 12:00 PM


QUESTION POSTED AT 28/03/2020 - 12:00 PM

What are two ways water travels from land to enter the ocean

•rivers
•runoff
• delta

ANSWERED AT 28/03/2020 - 11:47 AM


QUESTION POSTED AT 28/03/2020 - 11:47 AM

The cycle repeat when the carbon stored in the atmosphere as carbon dioxide gas is taken

It is the cycle of matter.

ANSWERED AT 28/03/2020 - 11:35 AM


QUESTION POSTED AT 28/03/2020 - 11:35 AM

Water changes from a liquid to a gas in the process of evaporation t or f? PLEASE HURRY!!!

I believe that's true

ANSWERED AT 28/03/2020 - 11:34 AM


QUESTION POSTED AT 28/03/2020 - 11:34 AM