An element is a ________ substance
A. Mixed
B. Pure
C. Combined
D. Human-made
Answers
Answer:
b, pure.
Explanation:
an element is a pure substance and it cannot be broken down hope this helped :)
Answer:
An element is a pure substance made up of identical atoms.
Explanation:
hope it helps
and brainliest if helped......
Related Questions
Heat energy is transferred on earth by the processes of convection, conduction, and radiation. How does heat energy cause materials to move during convection? Choose two statements that apply.
A. It causes colder materials to rise
B. It causes denser materials to sink
C. It causes warmer materials to sink
D. It causes less dense materials to rise
Answers
Colder materials sink
And warmer materials rise
Which option is a measure of the average kinetic energy of the particles in a substance?
plz help
Answers
Answer:
temperature is use to measure
The temperature can measure the average kinetic energy of the particles in a substance. Therefore, option (B) is correct.
What is average kinetic energy?The average kinetic energy of a molecule of a gas is, K.E.= (3/2) kT where 'T' is the absolute temperature of the gas and 'k' is the Boltzmann constant and
All molecules of a gas are identical in mass and size and this differs from other gases. The actual volume of the molecules of a gas is negligible compared to the total volume occupied by gas.
The force of attraction between molecules of a gas is negligible and they are moving in different directions with different velocities. Since the molecules are moving at different velocities so they possess different kinetic energies.
The average kinetic energy of molecules is directly proportional to the absolute temperature of the gas. When the temperature of the gas is increased, the molecules start moving faster.
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How to work out the relative mass of potassium? What is the calculation? ( explained very easily )
Answers
Answer:
39
Explanation:
Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.
———————————
(1/12)th Mass of one C12 atom
Which of the following is NOT a cost of using fossil fuels?
Answers
Answer: Burning fossil fuels decreases CO2 in the atmosphere
Explanation: Burning fossil fuel actually increases the amount of CO2 in the atmosphere, it doesn't decrease it.
Hope this helps!
Burning fossil fuels decreases co2 in the atmosphere
The image shows the gravitational effects of the moon (not shown) on the Earth (depicted here) and the resulting tides that form. Which statements are true about the gravitational force between the Earth and the moon? Select ALL that apply.
Responses
A The moon exerts equal gravitational force on all locations of the Earth
B The moon exerts a smaller gravitational force on Earth locations that are farther away
C The moon must be to the right of the Earth because gravity is an attractive force.
D The moon must be to the left of the Earth because gravity is a repulsive force.
E The moon exerts a greater gravitational force on the Earth than the sun does.
Answers
Answer: B
Explanation:
Brainliest please! (if im right)
please help me 7th grade science
When a chemical reaction occurs, what happens to the atoms of the two substances? Provide an example from the Sim (on Amplify) as evidence to support your answer.
When a chemical reaction does not occur, what happens to the atoms of the two substances? Provide an example from Sim as evidence to support your answer.
Answers
An example of this can be seen in the Sim on Amplify, where students can experiment with different chemical reactions. For instance, in the "Chemical Reactions" Sim, students can explore the reaction between iron and sulfur to form iron sulfide. In this reaction, the iron atoms and sulfur atoms combine to form a new compound, iron sulfide, with different properties than the original iron and sulfur. The atoms of the iron and sulfur are rearranged to form new bonds, resulting in the formation of a new substance. This is an example of a chemical reaction, where the atoms of the two substances are rearranged to form a new compound with different properties.
Answer:
Explanation:A chemical response is a chemical transformation in which two chemicals combine to create a third component.
(i) Adding diluted acid to an active metal causes the test tube to heat up and hydrogen gas to escape, which results in the production of heat.
(ii) When diluted hydrochloric acid is added to silver nitrate, AgCl, a white precipitate, results.
(iii) When water is added to quicklime, the mixture boils and produces heat along with a hissing sound.
(iv) Thermal breakdown of mercury oxide - Mercury turns from red to a metallic silver tint as a result of this process.
ZOOM IN TO SEE, But which one would be the correct answer this is easy!
Answers
Answer:
B.
Explanation:
Sometimes fossils can be found in sedimentary rocks. Which statement best explains why?
Answers
Answer: ITS A
Explanation: HOPE THIS HELPS
Individual organisms have a variety of traits that make them different from each other. Traits such as fur color and eye color vary from one individual to another. What determines the traits of an individual organism?
Answers
Answer:
Traits can be determined mostly by genes but can be by environmental factors, or a combination of both. Traits can be qualitative (such as eye color) or quantitative (such as height or blood pressure) A given Trait is part of an individual's overall phenotype.
I hope this helps you out!
How can the rate of a reaction be decreased?
Responses
A: having more surface area
B: lowering the amount of reactants
C: adding a catalyst
D: raising the temperature
Answers
Please answer with an actual answer and not just put a random word ^-^
Materials
large ball about the size of a basketball
small ball about the size of a tennis ball
strong light of about 100 watts or more
dark room
Directions
Place the large ball about 12 feet from the light source. Then place the small ball in the shadow of the large ball. Observe the shadow pattern.
Place the large ball in the shadow of the small ball. Observe the shadow pattern.
Questions
Which eclipse was modeled when the large ball was between the small ball and the light?
Which eclipse was modeled when the small ball was between the large ball and the light?
What does the large ball represent?
What does the small ball represent?
What does the light source represent?
Draw a picture showing a lunar eclipse.
Draw a picture showing a solar eclipse.
Upload your answers to the experiment questions and your drawings of a lunar and solar eclipse. Be sure to answer every question and use complete sentences.
Answers
Which eclipse was modeled when the large ball was between the small ball and the light?
The model is a "Lunar Eclipse" (If it was talking about the earth, then yes, it is a lunar eclipse).
Which eclipse was modeled when the small ball was between the large ball and the light?
The model is a "Solar Eclipse".
What does the large ball represent?
The earth.
What does the small ball represent?
The moon.
What does the light source represent?
The sun.
Hope this helps!~ <3
(I can't draw so sorry.)
Write a lab report on the lab ¨How do the process of conduction, convection, and radiation help distribute energy on earth.¨ for edge 1. Purpose- state the purpose of the lab.
2. Hypothesis- (Use if, then, because in your statement)
3. Materials- list all materials used in the lab
4. Procedures- state step by step what is being done in the lab
5. Observation/data- state what is being measured
6. Analysis/conclusion-state by summing up what was done in the lab and evaluate your
hypothesis with what actually happened
Answers
Answer: The sections of a lab report can vary between scientific fields and course requirements, but they usually contain the purpose, methods, and findings of a lab experiment. Each section of a lab report has its own purpose. 1. Title: expresses the topic of your study 2. Abstract: summarizes your research aims, methods, results, and conclusions
Explanation:
Where is the DNA stored in a cell?
Answers
Answer: nucleus
Explanation:
If flour, butter, chocolate chips, and a little baking soda are mixed together, and then shaped it into flat circles, what kind of change has been made?
physical change
particle change
chemical change
color change
Answers
explanation: trust me bro
In an electrical wire, if instead of copper, plastic wire is used. Would it conduct electricity?Justify your answer.
Answers
Answer:
No, a plastic wire would not conduct electricity. This is because plastic is an insulator that does not allow electric current to flow through it. In a wire, electrical conductivity is provided by the movement of charged particles - typically, electrons. Copper is an excellent conductor of electricity because it has a high number of free electrons that are not bound to atoms and can move through the wire very easily. However, in a plastic wire, the tightly bound electrons of its atoms do not allow for the free flow of charges, thus preventing the passage of electric current.
Science questions answer to get 20 points
Answers
Answer: (Q1) B. (Q2) D. (Q3) B. I believe (Q4) C.
Explanation: (Q3) B the medulla isn't playing a physical part in digestion as much as it controls the process this is a educated guess
Does the amount of rain that falls in an area determine which kinds of organisms can live there? Why or why not?
Answers
Match the following.
Drag the appropriate labels to their respective targets.
Answers
Answer:
oxygen - O2
chlorine- Cl2
neon- Ne
calcium- Ca
iodine- I
hydrogen- H2
Ne₂(g) - Neon gas (Ne)
I(s) - Iodine solid (I₂)
Ch(g) - Chlorine gas (Cl₂)
Ca(s) - Calcium solid (Ca)
O(g) - Oxygen gas (O₂)
H2(g) - Hydrogen gas (H₂)
Cl(s) - Chlorine solid (Cl₂)
O2(g) - Oxygen gas (O₂)
1. Ne₂(g) - This label represents the chemical formula for neon gas, which is Ne. Neon is a noble gas that is commonly used in neon signs due to its bright orange-red glow when an electric current is passed through it.
2. I(s) - This label represents the element iodine in its solid state. Iodine is a nonmetallic element that exists as a purple-black solid at room temperature.
3. Ch(g) - This label represents a gas called chlorine, which is chemically represented as Cl₂. Chlorine is a halogen gas that is used as a disinfectant and in the production of various chemicals.
4. Ca(s) - This label represents the element calcium in its solid state. Calcium is an alkaline earth metal that is commonly found in rocks, shells, and bones. It is essential for the proper functioning of our bodies and is also used in construction materials.
5. O(g) - This label represents oxygen gas, which is chemically represented as O₂. Oxygen is a colorless and odorless gas that is essential for respiration and the combustion of fuels.
6. H2(g) - This label represents hydrogen gas, which is chemically represented as H₂. Hydrogen is the lightest and most abundant element in the universe. It is used in various industries, such as the production of ammonia and petroleum refining.
8. Cl(s) - This label represents the element chlorine in its solid state. As mentioned earlier, chlorine is a halogen gas, so the correct label for chlorine in its solid state should be Cl₂(s).
9. O2(g) - This label represents oxygen gas, which is chemically represented as O₂. As mentioned earlier, oxygen is a colorless and odorless gas that is essential for respiration and the combustion of fuels.
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Calculate the volume (in cm3
) of 54 g
of water at 1 ∘C
.
Express the volume in cubic centimeters to two significant figures.
Answers
A. What evidence have you discovered to explain why air flows? B. What evidence have you discovered to explain why Earth has global wind systems? C. What evidence have you discovered to explain why ocean waters flow? D. What evidence have you discovered to explain how wind influences the movement of water? And for the Summary. Water off the coasts of some continents is typically colder than water further offshore because...
Answers
Ah yes, my school next year! Imma be in HIGH SCHOOLLLLLLLLLLLLL! YAY!
Answers
What is the charge on the Cr in Cr2O72-
Answers
Answer:
+6.
Explanation:
So, a chromium atom here has an oxidation number of +6.
What is the Uncontrolled variables/limitations for this science expirement? Does the shape of an ice cube affect how quickly it grows? Need help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAPNeed help ASAP
Answers
I hope this helps!
Genes are sections of DNA that code for a particular trait. Genes are
Answers
Answer: Genes are transcribed into RNA molecules, which are then translated into proteins.
Explanation: Genes are sections of DNA that contribute to certain traits, characteristics or functions. Genes code for proteins or parts of proteins that influence things like the immune system, skin pigmentation, hormone production, and eye color.
Answer:
Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes.
Explanation:
30 POINTSSSSSSSSSSSSS how is increasing the amount of sunlight most likely to affect an ecosystem? A. by increasing soil moisture B. by decreasing photosynthesis C. by increasing plant growth D. by decreasing the food supply
Answers
Answer:
here
Explanation:
The increase in sunlight up to a limit might result in an increase in the photosynthesis process as well as in transpiration. More amount of energy will be produced by plants.
Table 3: Terrestrial Planet Surface Features Images Mercury Venus Earth Mars Image shows plains and craters on the surface of Mercury formed by volcanic flows. Image taken by the MESSENGER robotic spacecraft orbiting Mercury. ©NASA Image of the Eistla Region on Venus. The circular features are volcanic domes. Radar image taken by the Magellan robotic space probe. ©NASA Image shows Nyamuragira volcano in Africa. Dark areas of the image show recent lava flows. Image taken by the Ikonos satellite orbiting Earth. ©NASA Image shows Olympus Mons volcano on Mars. Image taken by the Viking 1 Orbiter. ©NASA How do the surface features of these terrestrial planets compare at this scale?
This is confusing, I know. Please try your best on your answer.
Answers
Answer:
This isn't a question it looks like you copied and pasted something
The three cyclists shown below are all traveling at a speed of 13 m/s, but only one cyclist has a changing velocity. The orange cyclist is on the curve, and the green and blue cyclist are on the straight away. Select the rider that has a changing velocity.
(btw the extra tab is to cover my info)
Answers
Speed is distance/time
Distance=length of path travelled not taking into account direction.
For example if you walk North 5 meters and walk south 6 meters
Then your change in position(displacement) is 1 meter south but your distance travelled is 11meters.
I know this is a terrible explanation and if you can't understand I can try to expand on it further.
The orange one is changing direction while the rest cyclists are increasing displacement.
What is Velocity?Velocity is defined as the directional motion of an object as an indication of the rate of change of position as observed from a particular frame of reference which is measured by a particular standard of time. Velocity is the vector quantity as it has both direction as well as direction.
Velocity is explained as the displacement/time where the displacement being the change in position. In the above given example, the orange color cyclist's position is not changing as he is changing direction.
Thus, the orange one is changing direction while the rest cyclists are increasing displacement.
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I need help with this science!
Answers
Answer:
All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing. When viewed together, these characteristics serve to define life.
Answer:
Scientists classify living things at eight different levels: domain, kingdom, phylum, class, order, family, genus, and species. In order to do this, they look at characteristics, such as their appearance, reproduction, and movement, to name a few.
Explanation:
Which type of selection is shown in the graph above?
A. Disruptive selection
B. Stabilizing selection
C. Disaster Selection
D. Directional selection
Answers
In the given graph, the Evolved Population is showing disruptive selection. Hence, the correct option is A. Disruptive selection.
Stabilizing selection is a form of natural selection where individuals with average phenotypes are more likely to survive and reproduce their number. In this selection, the population tends to maintain a stable phenotype. As shown in the graph, the population is maximum for the population having a moderate length of neck.
Disruptive selection is a type of natural selection where extreme phenotypes are preferred over average phenotypes, leading to an increase in genetic variation and the population becoming more diverse. In this type of selection, the population diverges into two or more distinct phenotypic groups. As shown in the graph, two ranges of the population are favored for having traits for extreme lengths of the neck.
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Why are some incomplete fossils able to be pieced together? Full fossils of large animals can be found together. Hard tissue, like bone, never breaks or chips. Fossils require salt water to be preserved fully. Impressions from the skin can be preserved.
Answers
Answer:
Explanation:
The fossil record is considered to be incomplete because fossilization is a very rare phenomenon. Most organisms decompose quickly after their death, and their remains dispersed. In order for fossilization to occur, the remains have to be covered by sediments and stay undisturbed for thousands of years.
Answer:
The fossil record is considered to be incomplete because fossilization is a very rare phenomenon. Most organisms decompose quickly after their death, and their remains are dispersed. In order for fossilization to occur, the remains have to be covered by sediments and stay undisturbed for thousands of years.