Answer:
(3) 4 cm' and 2.0 g/cm3
Explanation:
Given:
volume= V= 8 cm³
mass= m= 16 g
The density is the mass per volume of a substance, so the density of the rock is:
density= d= 16 g/8 cm³= 2 g/cm³
When we cut the rock in half, we have a half volume and a half mass:
V= 8 cm³/2= 4 cm³
m= 16 g/2= 8 g
But the density is not altered because it is an intrisic property - it does not change with the amount of subtance. Thus, the density of a half rock is:
d = m/V= 8 g/4 cm³= 2 g/cm³
PLEASE NELP ASAP
What was the purpose of the experiment?
Type your answer here:
How can you identify the gas produced in a chemical reaction without observing the atoms and molecules directly? Explain.
Type your answer here:
Write a hypothesis based on observations and scientific principles.
Type your answer here:
Experimental Methods
What tools or materials did you use to collect your data?
Type your answer here:
Describe the procedure that you followed to conduct your experiment.
Type your answer here:
Data and Observations
Record your observations.
Type your answer here:
Conclusions
What conclusions can you draw about the identities of the gases produced in each chemical reaction? Write an evidence-based claim.
Type your answer here:
Based on your observations, which equation best models the reaction of vinegar (C2H4O2) and baking soda (NaHCO3)? Explain.
Answer:
What was the purpose of the experiment?
Type your answer here: The purpose of the experiment was to perform and observe the results of a variety of chemical reactions. To become familiar with the observable signs of chemical reactions. To identify the products formed in chemical reactions and predict when a reaction will occur. To write balanced equations for the reactions studied.
Explanation:
sorry i can only tell you the first one
Introduction
What was the purpose of the experiment?
The purpose of this experiment is to create CO2, also known as carbon dioxide, and observe chemical reactions.
How can you identify the gas produced in a chemical reaction without observing the atoms and molecules directly? Explain.
If I look at how the gas would react or its qualities, I can identify the gas without having to observe its atoms directly.
Write a hypothesis based on observations and scientific principles.
I hypothesize that the mixture produced carbon dioxide, an acidic and colorless gas. In addition to organic materials, such as leaves and dirt, carbon dioxide is also produced when they decay.
Experimental Methods
What tools or materials did you use to collect your data?
To conduct my experiment, I used a glass cup, baking soda, vinegar, paper to record my observations, and a match.
Data and Observations
Record your observations.
The baking soda and vinegar made bubbles and some steam. When I put the match above the glass, the flame went out.
Conclusions
What conclusions can you draw about the identities of the gases produced in each chemical reaction? Write an evidence-based claim.
The chemical reaction of CO2 caused the flame to go out.
Based on your observations, which equation best models the reaction of vinegar (C2H4O2) and baking soda (NaHCO3)? Explain.
"C" _"2" "H" _"4" "O" _"2" +"NaHC" "O" _"3" →"Na" "C" _2 H_3 "O" _"2" + "H" _2 "O"+"C" "O" _2
"C" _"2" "H" _"4" "O" _"2" +"NaHC" "O" _"3" →"Na" "C" _2 H_3 "O" _"2" + "H" _2 "O"+"O" _2
"C" _"2" "H" _"4" "O" _"2" +"NaHC" "O" _"3" →"Na" "C" _2 H_3 "O" _"2" + "H" _2 "O"+"H" _2
"C" _"2" "H" _"4" "O" _"2" +2"NaHC" "O" _"3" →"Na" "C" _2 H_3 "O" _"2" + "H" _2 "O"+"C" "O" _2
The equation that best models the reaction of vinegar is A
Because "C" _"2" "H" _"4" "O" _"2" is the acid vinegar
"NaHC" "O" _"3" is the baking soda
"Na" "C" _2 H_3 "O" _"2" + "H" _2 "O"+"C" "O" _2 is the product or the reaction.
Which term names a property or mineral
Answer: Streak
Explanation: For k12 Science Unit 2 test
а
What behavior does a fly
body
to escape
use
from
predators
Answer:
Quick getaway is the answer but I'm not too sure
Which might be aAfter reading the passage about acupuncture, identify which statement supports the
claim that acupuncture relieves pain.
Answer:
The National Institutes of Health found it effective in reducing pain and other symptoms, but it is not clear how it works.Explanation:
HELP WILL GIVE BRANLIEST
Answer:
I think it's the last one, photosynthesis takes place in all plant cells, and respiration takes place only in leaf cells, but im not 100% sure
Explanation:
Answer: last one
Explanation:
Describe the cycling of carbon in the carbon cycle as it passes through the living and non-living components of the ecosystem.
Answer: Photosynthesis, Decomposition, Respiration and Combustion
Explanation:
The cycling of carbon in the carbon cycle is released from animals and plants in form of carbon dioxide through respiration or released by decomposition and internalized by a process called photosynthesis in plants.
The carbon cycleIt initiates when a plant dies and gets buried turning into fossil fuel. This fossil fuel is burnt by humans converting most of the carbon into carbon dioxide.
Carbon dioxide is added to the atmosphere by respiration of animals and the plants. Plants again use this carbon dioxide to perform photosynthesis thus quickly adding it to their bodies from where the cycle continues.
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Dr. Schweitzer found structures identical to modern red blood cells and blood vessels inside the bone. Which organ system do blood cells and blood vessels belong to? A. circulatory system B. nervous system C. respiratory system D. skeletal system
Answer:
A. Circulatory system
Explanation:
Circulatory system consist of heart,blood cells&blood vessels
Chloroplasts and mitochondria are both involved in energy conversion in cells and share many similarities. Differentiate between chloroplasts and mitochondria. Choose ALL of the characteristics that apply ONLY to chloroplasts.
A) contain DNA B) found in plants C) contain pigments D) used in photosynthesis E) used in aerobic respiration
Explanation:
contain pigments c and used in photosynthesis
The main difference between chloroplasts and mitochondria are contained pigments, used in photosynthesis. The correct options are C and D.
What are chloroplast and mitochondria?The organelle found inside the cells of plants is known as a chloroplast. Additionally, there are particular algae that serve as the photosynthesis sites, where the sun's energy should be converted into chemical energy for the sake of growth. In addition to being employed in photosynthesis, it also contains pigments.
Membrane-bound cell organelles known as mitochondria (mitochondrion, singular) produce the majority of the chemical energy required to fuel cellular metabolic operations.
Therefore, the correct options are C) containing pigments and D) used in photosynthesis.
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Question 8
1 pts
s
When a person jumps off the diving board and they spread their whole body out in the
air, they will hit the water with a loud smack. This is called a "belly flop". This is due to a
unique property of water called
O capillary action
O surface tension
Odensity
O temperature
< Previous
Next >
Answer:
Surface Tension
Explanation:
Why are amino acids called amino acids?
Answer:
The name “amino acid” is derived from the amino group and carboxyl-acid-group in their basic structure. There are 21 amino acids present in proteins, each with a specific R group or side chainAll organisms have different essential amino acids based on their physiology.
Answer:
Because they are made of an amino group (NH3) and carboxylic acid group ( COOH)
= amino acid
Explanation:
Vitamins are created during:
A. Photosynthesis
B. Peroxidation
C. Combustion
D. All the above
Select the correct answer.
With support for cases such as Brown v. Board of Education, the National Association for the Advancement of Colored People (NA
its attention during the early days of the civil rights movement on doing which of the following?
Answer:
Although the Declaration of Independence stated that "All men are created equal," due to the institution of slavery, this statement was not to be grounded in law in the United States until after the Civil War (and, arguably, not completely fulfilled for many years thereafter). In 1865, the Thirteenth Amendment was ratified and finally put an end to slavery. Moreover, the Fourteenth Amendment (1868) strengthened the legal rights of newly freed slaves by stating, among other things, that no state shall deprive anyone of either "due process of law" or of the "equal protection of the law." Finally, the Fifteenth Amendment (1870) further strengthened the legal rights of newly freed slaves by prohibiting states from denying anyone the right to vote due to race.
Despite these Amendments, African Americans were often treated differently than whites in many parts of the country, especially in the South. In fact, many state legislatures enacted laws that led to the legally mandated segregation of the races. In other words, the laws of many states decreed that blacks and whites could not use the same public facilities, ride the same buses, attend the same schools, etc. These laws came to be known as Jim Crow laws. Although many people felt that these laws were unjust, it was not until the 1890s that they were directly challenged in court. In 1892, an African-American man named Homer Plessy refused to give up his seat to a white man on a train in New Orleans, as he was required to do by Louisiana state law. For this action he was arrested. Plessy, contending that the Louisiana law separating blacks from whites on trains violated the "equal protection clause" of the Fourteenth Amendment to the U.S. Constitution, decided to fight his arrest in court. By 1896, his case had made it all the way to the United States Supreme Court. By a vote of 8-1, the Supreme Court ruled against Plessy. In the case of Plessy v. Ferguson, Justice Henry Billings Brown, writing the majority opinion, stated that:
Explanation:
whut is a biofultproduc
2. What is the name of the site on a chloroplast where half of the reactions in photosynthesis occur?
thylakoid membrane
cell wall
stroma
grana
Answer:
thylakoid
Explanation:
Hope this helps
Which of the following occurs when the moon is closest to the Earth?
periapsis
apogee
revolution
ellipse
Answer:
periapsis
Explanation:
Periapsis is the point when the orbiting object comes the closest to the thing it is orbiting around; for example, the moon is at periapsis when it is closest to the Earth.
Moon revolves around the earth in an elliptical pathway. At some point moon approaches earth at its closest point. This point is called perigee. This closest approach is called periapsis.
What is periapsis?Moon is the only satellite of earth. Moon revolves around earth along with rotating about its own axis. Earth have a gravitational pull into moon and this force will be different at different point of orbital revolution.
Moon's orbit is elliptical. The points of farthest approach to earth is called apogee and the closest point is called perigee. Every planet will have an apogee and perigee with sun as for earth and also with their satellites.
The farthest approach of moon from the earth is called apoapsis and the closest approach is called periapsis. Periapsis is also called perilunar, parselene, perilunar etc. Hence, option A is correct.
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Match the organism with the biome where you would expect to see it.
Answer:
What are the 26 states of matter?
Bose–Einstein condensate.
Fermionic condensate.
Degenerate matter.
Quantum Hall.
Rydberg matter.
Rydberg polaron.
Strange matter.
Superfluid
10. Since I contain many enzymes,
I can digest an injured cell;
And can break down a large molecule
Into a smaller one as well.
What am I
Answer:
Lysosomes
Your Welcome!
1) why should we always breathe through the nose and not through the mouth ?
Answer:
Below
Explanation:
The nose is lined with hairs which act as a filter for particles like dust, pollen and other allergens so they don't enter your lungs.
Your nose also preheats the air you breath in.
1. Migration that can bring new allcles into a population.
A. natural selection
B. mutation
C. genetic drift
D. gene flow
E. sexual selection
2. Chance and random events that can reduce the variation in small population.
A. natural selection
B. mutation
C. genetic drift
D. gene flow
E. sexual selection
3. Individuals with inherited characteristics that allow them to best compete for limited resources will survive and have more offspring than those individuals with variations that are less able to compete. Because characteristics are inherited, these traits will be better represented in the next generation.
A. natural selection
B. mutation
C. genetic drift
D. gene flow
E. sexual selection
4. Leads to traits that may not be well suited to the environment but increase fitness.
A. natural selection
B. mutation
C. genetic drift
D. gene flow
E. sexual selection
5. Ultimate source of brand new alleles in a population.
A. natural selection
B. mutation
C. genetic drift
D. gene flow
E. sexual selection
Answer:
1. D (In population genetics, gene flow is the transfer of genetic material from one population to another.)
2. C (Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation. It can also cause initially rare alleles to become much more frequent and even fixed. When there are few copies of an allele, the effect of genetic drift is larger, and when there are many copies the effect is smaller.).
3. A and also E (Individuals with inherited characteristics that allow them to best compete for limited resources will survive and have more offspring than those individuals with variations that are less able to compete. Because characteristics are inherited, these traits will be better represented in the next generation.)
4. D (Gene flow can increase fitness but if it happens in another environment, it decreases the adaptability. If alleles are advantageous, the offsprings' inheritance increases.
5. B (Mutations are the main source of alleles)
What is hypothesis in paramecium homeostasis
Answer: osmosis
Explanation: water moves into the organism by osmosis and pumped out by the contractile vacuole . the concentration of solutes in the water will determine the rate of contractions in paramecium
2. Which specific cytoskeletal element is most susceptible to mitotic inhibitors?
Answer:
microtubules
Explanation:
Microtubules specific cytoskeletal element is most susceptible to mitotic inhibitors.
What is Microtubules?The third main component of the cytoskeleton, microtubules, are hard, hollow rods with a diameter of around 25 nm. Microtubules are dynamic structures that constantly assemble and disassemble within the cell, similar to actin filaments.
They have a role in a number of cell motions, including as some types of cell motility, the intracellular movement of organelles, and the division of the chromosomes during mitosis, in addition to determining the shape of the cell.
Microtubules, which typically consist of 13 linear protofilaments arranged around a hollow core, are created when tubulin dimers polymerize to generate them. The head-to-tail arrays of tubulin dimers that make up the protofilaments are organized in parallel.
Therefore, Microtubules specific cytoskeletal element is most susceptible to mitotic inhibitors.
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Which of the following allows water to move much faster across cell membranes? A) the sodium-potassium pump B) ATP C) peripheral proteins D) aquaporins
Answer:
D
Explanation:
I believe the answer would be aquaporins
Aquaporins efficiently speed up the total rate of water diffusion across the cell membrane due to the slow diffusion of water through the lipid bilayer, hence option D is correct.
What are aquaporins?Aquaporins (AQP) are essential membrane proteins that act as conduits for the passage of water and, occasionally, tiny solutes.
The Na+ K+ pump is an electrogenic transmembrane ATPase that was initially identified in 1957. It is located on the cytosolic side of the cell's outer plasma membrane. For every ATP, the Na+ K+ ATPase pumps 3 Na+ out of the cell and 2K+ into the cell.
Therefore, animals, plants, and microorganisms all have them preserved. Every aquaporin molecule has a pore in the middle, according to structural investigations of the molecules.
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4. (3 pts.) In aerobic respiration, oxygen is necessary to accept the final electrons at the end of
the electron transport chain. What happens when a person cannot bring oxygen into the body
(maybe they stop breathing)? What energy molecule will not be generated? How will this affect
the organism?
Answer:
their body starts shutting down and this will cause slow and painful death
Explanation:
How can antibiotic resistance be minimized?
Explanation:
There are many ways that drug-resistant infections can be prevented: immunization, safe food preparation, handwashing, and using antibiotics as directed and only when necessary. In addition, preventing infections also prevents the spread of resistant bacteria.
Which of the following is a correct difference between RNA and DNA?
1. RNA is single stranded and DNA is double stranded
2. RNA is double stranded and DNA is single stranded
3. DNA uses Uracil and RNA uses Thymine
4. RNA has deoxyribose and DNA has ribose
Answer:
Chupapi munyano
Explanation:
Answer:
The answer is A. RNA is single stranded and DNA is double stranded
Hope this helps!!
How does doing work on an object change its energy?
Answer:
WHEN WORK ISS DONE ON A OBJECT, ENERGY IS ADDED TORDS IT.
Explanation:
.
.
.
Help me pls I will give brainliest to the correct answerer. Do as much as you can pls
Answer:
Answer below! : )
Explanation:
Explain 1) The independent variable is the variable the experimenter manipulates or changes, and is assumed to have a direct effect on the dependent variable. The dependent variable is the variable being tested and measured in an experiment, and is dependent on the independent variable. 2) Testing only one variable at a time lets you analyze the results of your experiment to see how much a single change affected the result. If you're testing two variables at a time, you won't be able to tell which variable was responsible for the result. 3) The control group and experimental group are compared against each other in an experiment. The only difference between the two groups is that the independent variable is changed in the experimental group. The independent variable is "controlled" or held constant in the control group 4) Not sure about this one sorry! 5) hypothesizing, observing, and experimenting. 6) This rule says that where you have one situation that leads to an effect, and another which does not, and the only difference is the presence of a single factor in the first situation, we can infer this factor as the cause of the effect. 7) No matter how carefully observations and experiments are performed, it cannot be ensured that every possible factor is the same in every observation. 8) Munsell Charts are used to provide standard descriptions and names of color. 9) Nitrogen, phosphorus, and potassium. 10) Water table, also called groundwater table, is the upper level of an underground surface in which the soil or rocks are permanently saturated with water. 11) Humus significantly affects the bulk density of soil and contributes to its retention of moisture and nutrients. 12) Texture refers to the size of the particles that make up the soil. The terms sand, silt, and clay refer to the relative sizes of the soil particles. The combined portions of sand, silt, and clay in a soil determine its textural classification. 13) The main difference between sand silt and clay is their particle size. Sand particles are larger in size while clay particles are extremely fine, and silt particles are somewhere in between sand and clay particles. Sand, silt, and clay are the main mineral particles in the soil that affect its texture 14) Mineral matter is derived from the constituents of the parent material. Organic matter. The nature and abundance of iron. Moisture content. 15) In some mineral soils aluminum can be dissolved at pH levels below 5.0 becoming toxic to plant growth. Soil pH may also affect the availability of plant nutrients. Nutrients are most available to plants in the optimum 5.5 to 7.0 range. 16) Phosphorus is essential for cell division and growth and promotes plant maturation. 17) Aspect of soil porosity concerns the oxygen found within these pore spaces. All plants need oxygen for respiration, so well-aerated soil is important for growing crops. 18) The ground above the water table may be wet to a certain degree, but it does not stay saturated. The dirt and rock in this unsaturated zone contain air and some water and support the vegetation on the Earth.
I did most of them! I didn't do the "Identify". I hope this helps! : )
Sorry if I wrote a lot!!
A solution is a chemical reaction?
Answer:
False
Explanation:
A solution does not have to be a chemical reaction. Salt and water is a perfect example. Even though salt will dissolve in water, there is no chemical reaction going on. Salt remains salt and water remains water. The salt can easily be recovered by evaporating off the water.
Some solutions can be a chemical reactions but not all have to be.
Which statement is true about dichotomous keys?(1 point)
Dichotomous keys can only be used to classify organisms based on their habitats.
Dichotomous keys can only be used to classify organisms based on their observable traits.
Dichotomous keys can only be used if the name of the species is unknown.
Dichotomous keys can only be used if the name of the species is known.
The dichotomous key is a classification tool based on morphological characteristics. The correct option is B. Dichotomous keys can only be used to classify organisms based on their observable traits.
What is a Dichotomous key?A dichotomous key might be considered a significantly useful tool to classify organisms.
The key provides an easy and fast way for identification by describing different morphological observable traits, leading you to the correct taxonomic classification.
The term dichotomous refers to how information is provided. You will always have two options (a and b, or 1 and 2), and you will have to choose one of them according to the characteristics of your organism.
Each time you choose an option, it leads you to the following description, which gets more specific each time.
Probably you might need an atlas or a dictionary to understand some of the technical terminologies.
You will also need to carefully observe your specimen, to get to distinguish different traits. If the specimen is too small you might need a loup.
The correct statement is B. Dichotomous keys can only be used to classify organisms based on their observable traits.
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Answer: 1. they lack roots 2. Dichotomous keys can only be used to classify organisms based on their observable traits. 3. domain 4. Both focus on illustrating taxonomic relationships between organisms. 5. domains
Explanation: just took the quick check made 5/5 hope this helps :)
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