Describe how you could use properties to determine whether or not a sample of a substance is pure.
Answer:
It depends the substance
Explanation:
Physical properties of a substance like Color, odor, density, melting temperature, boiling temperature can determine the purity of a substance.
What are the properties of a pure substance ?The matter can be classified as pure substances and mixtures.
Pure substances are made up same kind of particle and have a constant structure.
Pure substances can be up two types elements and compounds.
An element which consists of only one type atom, so it can not be broken down by using physical or chemical method. Elements are metals, non-metals or metalloids.
Compounds are the pure substances if two or more same type of elements are combined chemically, but these can be broken down into separate elements by treating them with chemical methods.
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Anything that occupies space and takes up mass
Answer:
Matter
Explanation:
Matter consist of tiny and discrete particles
Explanation:
Hey there!!
The answer is matter.
We simply define matter as anything which occupies space, has some mass.
Hope it helps...
What conclusion is best supported by the selection above ? NUMBER 2
Help! Read the question!
Answer:
the answer is c
Explanation:
:3 np i was glade to help
why it is important that tendons do not stretch?
Answer:
Ligaments and tendons (since they have less elastic tissue) are not intended to stretched very much at all. Overstretching them may weaken the joint's integrity and cause destabilization (which increases the risk of injury).
Do fireworks have matter?
Answer:
yes
Explanation:
everthing does even fire
A scientist wishes to represent the location of an earthquake in California. Which type of model is most appropriate for this purpose?
Answer:
Seismograph?
Explanation:
If an earthquake happens, seismologists use seismic waves that are detected with seismographs, to locate the epicenter of an earthquake, and also to estimate the strength and duration of the earthquake
On topographic maps, how do you represent a steep slope?
A. Contour lines that are closely spaced
B. Contour lines that are dashed or dotted
C. A lack of contour lines
D. Contour lines that are far apart
Answer:
Contour lines that are closely spaced(Apex Approve)
Explanation:
On a topographic map the amount of elevation change is related to the number of contour lines. Using the same contour interval, the more contour lines over the same distance indicates a steeper slope. As a result, areas of a map where the contour lines are close together indicate steeper slopes
Cardiac veins drain blood into the_______, which will empty into the_______.
a. coronary sinus; left atrium.
b. great cardiac vein; superior vena cava.
c. great cardiac vein; left atrium.
d. inferior vena cava; right atrium.
e. coronary sinus; right atrium.
Answer: Option E.
Coronary sinus, right atrium.
Explanation:
Coronary sinus, right atrium is part of the circulatory system that consist of arteries, arterioles, veins, capillaries that move blood to the heart tissue and remove waste from the blood.
The cardiac veins return deoxygenated blood to the right atrium and it them moves to the right ventricle then to the heart where it becomes oxygenated
The coronary sinus received drain blood from ventricles veins, it then moves the deoxygenated blood to the right atrium which it transfer or move to the right ventricle (through the tricuspid valve which in turn move the blood to the pulmonary artery for pulmonary veins.
When a lizard eats and insect, it is considered _____________ .
Group of answer choices
Predation
Mutualism
Parasitism
Commensalism
Answer:
predation
Explanation:
the lizard is acting as a predator to the insect
what part of the brain is labeled c in the diagram
Answer:
What diagram my guy
Explanation:
Theres no diagram
The part of the brain is labeled c in the diagram is forebrain which has been represented in the diagram.
Which part of the brain is more linguistic?In comparison to the right brain, the left brain is more linguistic, analytical, and organized. It is often referred to as the digital brain. It performs tasks like reading, writing, and calculations better.
According to the hypothesis, persons who are left-brain dominant perform best in occupations that require verbal, mathematical, and linear thinking, such as that of an accountant, scientist, or computer programmer.
Children that use their left brain more effectively tend to think more analytically and do academically well. They might be very good at memorizing enormous quantities of information, have a large vocabulary, and pay close attention to detail.
Therefore, The part of the brain is labeled c in the diagram is forebrain which has been represented in the diagram.
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what is one reason that scientists who study weather need extremely advanced technology
1. to anticipate changes in weather patterns
2. to remove the need to make forecasts several days in advance
3. to monitor weather events restricted to one region
4. to account for one factor at a time that affect weather patterns
choose one
Answer:
To anticipate changed in weather patterns
Explanation:
1. I took the test
2. Scientist who study weather need to have a high quality standard technology in order for them to forecast weather accurately and also to forecast weather several days in advance.
Define the term, Stratigraphy. identifying landofrms graph keeping the record of smal microbes measures eaerthquake vibrations process of describing the patterns in which rock layers are deposited.
Answer:
Process of describing the patterns in which rock layers are deposited.
Explanation:
Stratigraphy is a field of earth sciences that studies the sequence of consecutive rock layers (stratification), with the aim of dating and describe the characteristics of the soil.
Stratigraphy is used to determine the paleogeography of an area. It also plays an important role in archaeological, paleoclimatic and paleontological research, where it is important to know from which layer a particular object, fossil or data originates and to which age it corresponds.
Impulse is just a change in?
Answer plss
Answer:
due to the rate of blood circulation
Answer:
is a quantity that describes the effect of a net force acting on an object (a kind of "moving force").
is represented by the symbol J (boldface).
is the product of the average net force acting on an object and its duration.
J = F∆t
is the force-time integral.
J = ⌠
⌡ F dt
is a vector quantity (since force is a vector and time is a scalar).
Impulse-Momentum Theorem
The impulse-momentum theorem states that the change in momentum of an object equals the impulse applied to it.
J = ∆p
If mass is constant, then…
F∆t = m∆v
If mass is changing, then…
F dt = m dv + v dm
The impulse-momentum theorem is logically equivalent to Newton's second law of motion (the force
Which amino acids have side chains that fit into the specificity pocket of chymotrypsin?
Answer:
The aromatic amino acids; Phenylalanine, Tryptophan, Tyrosine
Amino acids with bulky side chains; Leucine and Methionine
Explanation:
Chymotrypsin is a member of the serine proteases, which is family of enzymes that hydrolyze peptide bonds through the action of an active site serine.
Chymotrypsin cleaves peptide bonds on the C-terminal of aromatic amino acids or amino acids with bulky hydrophobic sides chains such as phenylalanine, tyrosine and tryptophan, leucine and methionine. This specificity for aromatic amino acids is due to its large hydrophobic pocket and due to the complementary nature of these amino acids when they bind to the pocket.
Anytime you speculate about a problem and think of an answer based on what you
see on TV or read on the Internet, you are forming a scientific theory.
a. True
b. False
Answer:
b. False
Explanation:
A scientific theory must have strong support from testable facts that are confirmed (or rejected) by observational and/or experimental procedures. The scientific method is a rigorous process that consists of arising a conjecture (hypothesis) which can be subsequently used to make predictions from its logical consequences, and finally to obtain information from empirical observations/experiments in order to obtain a conclusion about the veracity of the scientific claims (i.e., a hypothesis must be testable). In consequence, a scientific theory can not be based only on 'light' conjectures, but trustworthy observational data from the real world.
In the presentation of their findings, the authors of the Metabo-Herb study _______.a. Clearly state the limitations of their studyb. Relate the results of their study to previous work in the fieldc. Suggest additional research that may help clarify the effectiveness of fertilizersd. Provide a detailed description of the study site including physical and biologicalfeaturese. depart from scientific convention by characterizing the results of their study as‘proving’ their hypothesis.
Answer:
The correct answer is E) the authors of the Metabo-Herb Study depart from scientific convention by characterizing the results of their study as ‘proving’ their hypothesis.
Explanation:
Scientific convention refers to the meeting or gathering of scientists with similar interests to agree on a collective way of pursuing, addressing, or approaching a set of agreed activities.
In order words, is an agreed way of doing things by a group of scientists with similar interests.
In relation to the question, there is a scientific convention with respect to experiments and the presentation of scientific studies. The scientific convention requires that figures, formulae, units, and data (graphs, diagrams, tables) must be included in the presentation of studies for other scientists to also verify before a study can be accepted as having proven its hypothesis.
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what layer of skin contains the stem cells that cause fingernail growth
Answer:
A nail grows from a deep layer of living epidermal tissues, called the nail matrix, at the proximal end of the nail. Stem cells in the nail matrix keep dividing to allow nail growth, forming first the nail root and then the nail plate as the nail continues to grow longer and emerges from the epidermis
Hope this helps
Answer:
nail matrix
Explanation:
it is found at the proximal end, and it contains stem cells, which form keratinocytes( which make up the nail)
Which phrases are true of only the mantle?
Answer:
It is the thickest layer of the earth about 2900 km thick
It makes up 82% of the earth's volume and is in a semi - molten state
This is where magma is found and created
Convection currents in the mantle causes the tectonic plates to move
Explanation:
You test-cross plants you suspect to be AaBb dihybrids and look at 100 offspring, with the following results: Phenotype AB 22 Ab 28 aB 29 ab 21 100 total1. You wish to test the hypothesis that the data are best explained as a dihybrid test cross AaBb x aabb. For a chi-square test, what expected number would you use for the aB class?2. Calculate the chi-square value for these data given the model that the results are from a dihybrid test cross of two genes on separate chromosomes.3. Using the chi-square table provided, determine the probability that the model would give the observed data. Degrees P Values
of freeom | 099 | 090 | 050 | 0.10 | 0.05 | 0.01 | 0.001
1 - 002 .45 2.71 3.84 6.64 10.83
2 0.02 0.21 1.39 4.61 5.99 9.21 13.82
3 0.11 0.58 2.37 6.25 7.81 11.35 16.25
4 0.30 1.03 3.36 7.78 9.49 13.28 18.47
5 0.55 1.61 4.35 9.24 11.07 15.09 20.524. Given this probability, would you accept or reject your model?
Answer:
- 002 .45 2.71 3.84 6.64 10.83
2 0.02 0.21 1.39 4.61 5.99 9.21 13.82
3 0.11 0.58 2.37 6.25 7.81 11.35 16.25
4 0.30 1.03 3.36 7.78 9.49 13.28 18.
Explanation:
From the test cross and X² test, I assume the individual is dihybrid and genes are in separate chromosomes. 1)25 aB. 2)X²=2. 3)P₀.₀₅=7.81. 4)Accept the model.
What is a test cross?A test cross is a cross we use to determine the genotype of individuals whose phenotype we already recognize.
The cross occurs between the individual of an unknown genotype and a recessive h0m0zygous individual. We want to know if the unknown genotype is heter0zyg0us or h0m0zyg0us dominant for a single gene.
Considering only one gene involved in the cross,
if the individual is heter0zyg0us, the progeny will be 50% heter0zyg0te and 50% h0m0zyg0te expressing the recessive trait.The phenotypic and genotypic ratio is 1:1
if the individual is h0m0zyg0us dominant, the whole progeny will be heter0zyg0us.Considering two genes that assort independently are test crossed,
If the individual is a dihybrid -heter0zyg0us for both genes-, the progeny will express equal phenotypic and genotypic ratio, 1:1:1:1.If more than one gene are involved, we can also determine if these genes assort independently, or if they are linked.
If genes are located in different chromosomes or are far from each other in the same chromosome, they assort independently, and their phenotypic and genotypic ratios are 1:1:1:1If these genes are linked, after the test cross, the distribution of phenotypes among the progeny differs from 1:1:1:1.When phenotypes appear in different proportions than the expected ones, we can assume that these genes are linked.
However, the difference between the observed and the expected data can be by random chance. This means that genes could assort independently, but by chance, the observed ratios vary from the expected ones.
To analyze these situations and determine is the difference is by chance or because genes are linked, we need to perform a chi-square test.
---------------------
Now, let us answer the question.
Available data:
Test cross
F1 = 100 individuals
AB 22 Ab 28 aB 29 ab 211) What expected number would you use for the aB class?
To answer this question, we assume genes assort independently, so if this is the case, genotypic ratio should be 1:1:1:1, or 25% AB : 25% aB : 25% Ab : 25% ab
100% ------------- 100 individuals
25% -------------X = (25% x 100) / 100% = 25 individuals AB
25% -------------X = (25% x 100) / 100% = 25 individuals aB
25% -------------X = (25% x 100) / 100% = 25 individuals Ab
25% -------------X = (25% x 100) / 100% = 25 individuals ab
So, accordig to our calculations, the expected number for the aB class is 25 individuals.
----------------------------
2) Calculate the chi-square value.
Model: dihybrid test cross of two genes on separate chromosomes -assort independently-.
AB Ab aB ab
Observed, O 22 28 29 21
Expected, E 25 25 25 25
(O-E)² / E 0.36 0.36 0.64 0.64
X² = Σ(Obs-Exp)²/Exp = 0.36 + 0.36 + 0.64 + 0.64 = 2
X² = 2
The chi-square value is X² = 2
-------------------------
3) Determine the probability that the model would give the observed data.
Freedom degrees = n - 1 Where n is the number of classes ⇒ 4.
Freedom degrees = 4 - 1 = 3
Significance level = 0.05
Conventionally, we use 0.05 = 5% as the significance level.
Critical value (table value) = 7.81
Considering a significance level of 0.05 and 3 freedom degrees, the critical value equals 7.81.
--------------------------
4) would you accept or reject your model?
X² = 2P₀.₀₅ = 7.81X² < P₀.₀₅ ⇒ 2 < 7.81
p value is greater than X², so there is not enough evidence to reject the null hypothesis. The ungenotype might be a dihybrid, and there might be independent assortment.
I would accept the model.
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what is microsporangium
Answer:
microsporangium are sporangia that produce microspores and give rise to male gametes
Explanation:
What is the porosity of the silt sample?(The sediment volume for each sample is 400ml.) a. 25.5% b. 39.75% c. 45% d. 53%
Answer: I hope this help it is B.39.75%
Explanation:
The porosity of the silt sample is :
B) 39.75%"
"Porosity of silt sample"
The porosity of the silt sample is 39.75%.
Soil porosity alludes to the division of the full soil volume that's taken up by the pore space .
A sponge is an case of a permeable fabric because it incorporates a huge number of purge spaces compared to its volume.
Porosity is the property of an question that communicates the entire volume of purge or pore space within the material.
Thus, the correct answer is B.
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The table below shows the level of carbon dioxide in the atmosphere for a period of 50 years.
What conclusion can you make about how the carbon dioxide level has changed over time?
A)The Level has not changed
B)The Level of Co2 has declined
C)The Level of Co2 has risen
D)The Level has reached its maximum
Answer:
The answer is C.)
Explanation:
I took the test.
An igneous rock is light in color and has extremely coarse grains. What is the most likely origin of the rock?
A a magma chamber
B the bottom of the ocean
C an outer slope of a volcano
D the shore of a volcanic island
Answer:
The correct answer is a magma chamber
Explanation:
Got it right on Edge 2020
Roses attract more pollinators than tulips
Answer:
Pollinators are such as bees, insects, moths etc. that help in pollination of flowers.
Explanation:
When we heard about the pollinator we always think that theses are bees. Bees are very important in pollination of the plant. Pollinators are the insects that take some pollen from one flower to another flower and the procedure takes place for further.
These flowers attracts bees, insects, butterflies, bats moth and small mammals. Rose color and its tempt with fragrance attracts insects and bees. There are variety of flowers that attracts pollen but rose attract more because of fragrance and its color.
Crossing over shuffles alleles on:_____.a. sister chromatids.b. different non-homologous chromosomes.c. chromosomes within different cells.d. different homologous chromosomes.d. none of the answers are correct.
Answer:
d
Explanation:
Crossing over shuffles alleles on non-sister chromatids of homologous chromosomes.
At the prophase I stage of meiosis, homologous chromosomes synapsed to form a four-chromatid structure known as tetrad. Exchange of chromosomal segments between non-sister chromatids of the tetrad then takes place, a process that results in the reshuffling of genes or alleles on the non-sister chromatids.
Hence, none of the answers is correct.
Correct option: d
Which statement would most likely explain why the results of one new experiment did not support an accepted hypothesis?
Explanation:
You need to add a picture so we can see all of the statements.
Answer:
C: The hypothesis was false, and scientists should replace it with a new one.
try it
In an experiment, the group that is exposed to the factor being tested
Gwen is a forensic technician. One day, the police send a skeleton to her lab and ask her to identify if it belonged to a male or female human. Which scientific field will Gwen use to identify the gender of the skeleton? A. physics B. biology C. chemistry D. entomology
Answer:
(B)iology
Explanation:
Biology is a branch of science that studies about the living organisms.
What is the difference between mitosis, and meiosis?
Answer:
Cells divide and reproduce in two ways, mitosis and meiosis. Mitosis results in two identical daughter cells, whereas meiosis results in four sex cells. Below we highlight the keys differences and similarities between the two types of cell division.
Explanation: