1. Which graph shows the melting of crystalline solids? Explain your reasoning.
2. What type of solid does the other graph show? Explain.
Hair color is a trait that’s controlled by many genes working together. Each gene contributes to this trait only in a small proportion. Which pattern of inheritance is this?
Which statement is true about a liquid but not a gas? It will change shape and take the shape of its container. It has more internal energy than the solid state. It allows particle to move past each other relatively easily. It has close to a constant volume as pressure is applied to it.\
Answer:
d
Explanation:
1.An acid is a substance that has a pH value that is lower than 7. A base is a substance that has a pH that is greater than 7. Citric acid commonly present in sour foods. Which one of these might be the pH of a citric acid solution?
pH=3.2
pH=7.0
pH=10.3
pH=14.0
2.Which mixture is homogenous?
Salt stirred together with sugar
Sugar dissolved in water
water droplets scattered in the air to form fog
dirt suspended in water
3. Which mixture is heterogeneous
salt dissolved in water
air
metal ally
tossed salad
Question 1: Define the terms hypothesis, independent variable, dependent variable, and a controlled variable in your own words.
Question 2: We discussed the importance of having only one independent variable, but trying to test more than one independent variable is an error many people make. In the following experiment, identify the errors that the experimenter made and summarize a valid way to test his research question: What cooking spray best keeps food from sticking to a pan? In the morning, Dan uses grapeseed oil to cook eggs for breakfast; for lunch, he uses vegetable oil spray to coat a muffin tray and cooks cornbread to eat with his chili; for dinner, he uses olive oil to pan cook a hamburger patty.
Most enzymes in living things are made up of __________.
A. carbohydrates
B. lipids
C. proteins
D. nucleic acids
Answer:
The correct answer is C.
Explanation:
Enzymes are proteins that catalyze chemical reactions in living things. Enzymes are catalysts, so they are substances that without being consumed in a reaction significantly increase the speed. They do not make impossible reactions feasible but accelerate those that could spontaneously occur, increasing their speed when reacting.
Have a nice day!
Which of the following describes the electron sharing between two oxygen atoms?
Each oxygen shares two electrons with each other.
Each oxygen shares eight electrons with each other.
Each oxygen shares one electron with each other.
Each oxygen shares six electrons with each other.
The correct description of electron sharing between two oxygen atoms is "Each oxygen shares two electrons with each other."
Each oxygen atom has six valence electrons. When they bond to form an oxygen molecule (O2), they share two electrons each, resulting in a double covalent bond. This sharing allows each oxygen atom to achieve a stable octet configuration, resembling the configuration of a noble gas. Therefore, the correct answer is that each oxygen shares two electrons with each other.
when a star dies which of these celestial objects is it most likely to help create ?
1 a planet
2 a star
3 a moon
4 a meteor
5 a comet
The correct answer is option 2, that is, a star.
Stars die as they consume all the fuel, which permits a star to go through the process of fusion. A star is formed majorly of helium and hydrogen. Once a star uses all the hydrogen, the star begins to die. When a normal-sized star dies, the core eventually cools into a white dwarf, and then into a black dwarf.
White dwarf refers to a very dense and small star, which is usually of the size of a planet. A white dwarf is produced when a low-mass star has used all its central nuclear fuel and lost its outer enveloping as a planetary nebula.
A student conducted an experiment to test whether talking to plants would help them to grow faster. The student talked to one group of plants and hand watered them. The student did not talk to the other group of plants and used sprinklers. After three weeks, the plants that were spoken to showed much more growth than the plants that were not. Based on the results of this experiment, which is the best conclusion? Talking to plants may or may not help plants grow faster because three weeks is not enough time to tell. Talking to plants may or may not help plants grow faster because the amount of water given was likely different for each group. Talking to plants does not help plants grow faster because the experiment did not involve enough groups of plants to determine this. Talking to plants does help plants grow faster because those plants showed more growth.
Answer is: Talking to plants may or may not help plants grow faster because the amount of water given was likely different for each group.
The scientific method is a process for experimentation that is used to explore observations.
Steps of the scientific method:
1) ask a question about something that is observed.
2) do background research. It this ecample, research is not good enough, because there are teo variables (talking to plants and amount of water).
3) construct a hypothesis, an attempt to answer questions with an explanation that can be tested.
4) test of hypothesis.
5) analyze collected data and draw a conclusion.
why is mitosis important to all living things
A student dissolved a sample in hexane, spotted it on to a TLC plate and eluted using ethyl acetate. After visualizing the TLC plate under a UV lamp, the student found their sample had two spots corresponding to Rf values of 0.31 and 0.85. They ran the TLC plate again, this time dissolving the compound in dicholoroacetic acid and using ethyl acetate as the eluent. What will be the Rf values for each spot?
1) Consider the following silica gel TLC plate of compounds A, B, and C developed in hexanes:
Determine the Rf values of compounds A, B, and C run on a silica gel TLC plate using hexanes as the solvent.Which compound, A, B, or C, is the most polar?What would you expect to happen to the Rf values if you used acetone instead of hexanes as the eluting solvent?How would the Rf values change if eluted with hexanes using an alumina TLC plate?Show answer
2) You are trying to determine a TLC solvent system which will separate the compounds X, Y, and Z. You ran the compounds on a TLC plate using hexanes/ethyl acetate 95:5 as the eluting solvent and obtained the chromatogram below. How could you change the solvent system to give better separation of these three compounds?
Show answer
3) After a rather lengthy organic chemistry synthesis procedure, a student ran the product of the reaction on a TLC plate and obtained the result below. What might he/she have done wrong, if anything?
Show answer
4) A student spots an unknown sample on a TLC plate. After developing in hexanes/ethyl acetate 50:50, he/she saw a single spot with an Rf of 0.55. Does this indicate that the unknown material is a pure compound? What can be done to verify the purity of the sample?
Show answer
5) Consider a sample that is a mixture composed of biphenyl, benzoic acid, and benzyl alcohol. The sample is spotted on a TLC plate and developed in a hexanes/ethyl acetate solvent mixture. Predict the relative Rf values for the three compounds in the sample.
Show answer
6) Plate A, below, represents the TLC chromatogram of a compound run in hexanes. The same compound was then spotted on a large TLC plate and again run in hexanes. Which TLC plate, B, C, or D, correctly represents how far the compound would run on the longer plate?
Show answer
Back to TLC
Original content © University of Colorado at Boulder, Department of Chemistry and Biochemistry.how are the empirical and molecular formulas for a compound related?
compounds with ____ bonds are poor conductors of electricity, even when melted.
Answer is: covalent.
Covalent compound (for example methane) are usually bad electricity and heat conductors, because molecules aren far from each other, so heat transfer is less efficient.
They do not form ions and atoms are less positive and negative than in ionic compounds.
Ionic compounds are good good electricity and heat conductors, because ionic compounds (for example sodium chloride NaCl) have mobile ions (cations and anions) that are able to transfer electrical charge. This compounds also conduct heat, because the ions are next to each other, so energy can be transferred efficiently from one place to another.
What happens to the sample's reported water content if the salt decomposes yielding a volatile product?
The decomposition of salt yielding a volatile product can increase the reported water content of a sample in volatilization gravimetry, due to the attribution of the mass loss of the volatile product to water content.
When a sample's salt decomposes, yielding a volatile product, the reported water content of the sample can be affected. In volatilization gravimetry, the sample undergoes thermal or chemical decomposition, which leads to a change in mass resultant from the loss of volatile material. If the decomposition of the salt generates a volatile product, such as water vapor, this will lead to an erroneously high water content measurement since the volatile product is included in the total mass loss that is attributed to water content.
The temperatures used in drying the sample affect the results. Drying the sample at a lower temperature (103-105°C) could result in the retention of some occluded water, whereas drying at a higher temperature (180°C) may release occluded water but also cause a greater loss of substances like carbonates. If salts like chlorides and nitrates decompose, they may form volatile products that could escape, thereby falsely increasing the measurement of the water content.
To ensure accurate evaluations, it's essential to understand the decomposition products and use specialized equipment to trap and weigh any volatile products. This allows for a more precise measurement of the true water content of the sample.
What is an example of a molecule? (That I can draw)
What is true of intercellular signals that do not go through direct connections between cells, such as plasmodesmata?
A. The signal fails to reach the inside of the cell, and the cell does not respond.
B. The signal is transferred to an adjacent cell for signal transmission.
C. An ion-linked channel to the nucleus opens up.
D. A receptor molecule accepts the signal and transports it inside the cell.
I believe that what happens here is that when those cells carrying those intercellular signals do no pass through the connections, actually the signal is passed through or are transferred to adjacent cells for signal transmission, hence the answer is:
B
I did the test and C. what correct. Could you please mark me brainiest?
What happens as a result of the kinetic energy of the particles is a liquid being comparable with the inter molecular attractions between the particles?
1 the particles do not move enough to change positions so the liquid is not compressible
2 the particles move enough that they separate from one another and take the shape of the container
3 the particles do not move enough so they are fixed in place and the liquid has a fixed volume
4 the particles move enough that that are not fixed in place and the liquid can flow
minerals are classified into groups based on ____
Answer:
The correct answer is: their composition.
Explanation:
The mineral classification is based on the chemical composition and internal structure, which together represent the essence of a mineral and determine its physical properties. According to the chemical composition, minerals are divided into classes according to the dominant anion or anionic group, for example, oxides, halides, sulphides and silicates, among others.
Minerals have the same anion or dominant anionic group in their composition, so they have family similarities and characteristics more clearly and strongly marked than those that share minerals that have the same dominant cation. Examples of this are carbonates, since they resemble each other more than copper ores.
Minerals related by the domain of the same anion tend to occur together in the same place or in similar geological deposits; for example, sulphides generally occur in associations close to deposits of the type of veins or replacement, while silicates form most of the rocks in the earth's crust.
I am a cold planet on the surface but hot at my core. There are 11 rings that circle me. You will find 21 moons in orbit around me. I rotate on my side. Which planet am I? A.
Pluto
B.
Jupiter
C.
Saturn
D.
Uranus
What is the balanced net precipitation reaction for BaCl2 and KOH?
Final answer:
The balanced net precipitation reaction for BaCl₂ and KOH results in solid barium hydroxide and potassium chloride in solution, with the net ionic equation being Ba²⁺(aq) + 2OH⁻(aq) → Ba(OH)₂(s)
The balanced net precipitation reaction between aqueous barium chloride (BaCl2) and potassium hydroxide (KOH) involves a double displacement reaction where the cation of one reactant (Ba2+ from BaCl2) combines with the anion of the other reactant (OH- from KOH) to form an insoluble product, barium hydroxide (Ba(OH)2).
The complete balanced equation is:
BaCl₂(aq) + 2KOH(aq) → Ba(OH)₂(s) + 2KCl(aq)
The net ionic equation, which shows only the species that change during the reaction, is:
Ba²⁺(aq) + 2OH⁻(aq) → Ba(OH)₂(s)
This equation is balanced both in terms of atoms and electric charge, with barium ions and hydroxide ions forming barium hydroxide, which precipitates out of the solution as a solid.
Neon is an example of a(n): A. Alkali Metal B. Noble Gas C. Halogen D. Rare Earth Metal
When speaking about his numerous and important contributions to science, Isaac Newton said: "If I have been able to see further, it is because I stood on the shoulders of giants.”
Explain how this statement relates to scientific knowledge, theories, and laws changing over time.
a scoop of baking soda is added to a beaker containing vinager.the baking soda disapears and bubbles are observed.this is an example of an change
Which of these is a physical property? Flammability Malleability Reactivity Toxicity
Which method would be best to separate a mixture of oil and vinegar?
Suppose a cell is seriously deprived by water. How might this lack of water affect the cell’s enzymes?
If a cell is seriously deprived of water, this lack of water would most likely affect the cell’s enzymes because:
The cytoplasm and plasma membrane would not function properlyBoth the plant and animal cell needs water in order to perform their basic functions which include transport of materials, waste distribution, production of genetic information, and many more.
As a result of this, we can see that there would be a serious problem if any of these cells are deprived of water which would lead to the cytoplasm and plasma membrane to partially shut down because they would not be able to engage in protein synthesis and other important functions.
Read more here:
https://brainly.com/question/2299033
In which biome are you likely to find an organism that has a white coat in winter and a light brown coat in summer? A. desert B. coniferous forest C. tropical rainforest D. savanna
Answer: B. Coniferous forests
Explanation:
The coniferous forests are found in regions of Siberia and Canada. These forests exhibit climatic conditions which range from extremely cold winters, mild to extremely hot summers. Thus the living beings in these forests exhibit adaptations. The organisms which are in brown coat acquire a trait of white coat in winters due to adaptation. It helps the organism to remain insulated and mimic the color of the snow so that the organism remain hidden from the predators.
A sample of C3H8 has 7.52×1024 H atoms. How many carbon atoms does the sample contain?What is the total mass of the sample?
The C3H8 sample has 2.82 x 1024 carbon atoms and a total mass of 68.8712 g.
Explanation:Given that the number of H atoms in the C3H8 sample is 7.52 x 1024, calculating the number of propane (C3H8) molecules involves dividing that number by the amount of hydrogen atoms in a single C3H8 molecule, which is 8. This gives us the number of molecules in the sample as 9.4 x 1023 molecules.
As each propane molecule has 3 carbon atoms, the total amount of carbon atoms in the sample can be found by multiplying 9.4 x 1023 by 3, resulting in 2.82 x 1024 carbon atoms.
In order to find the total mass of the sample, we need to know the molar mass of propane, which is 44.097 g/mol. Using Avogadro's number (6.02 x 1023 molecules/mol), we can find the number of moles in the sample, which is 1.56 moles of propane. Multiplying this by the molar mass, we get that the total mass of the sample is 68.8712 g.
Learn more about Mole calculations here:https://brainly.com/question/33652783
#SPJ12
1. Which graph shows the melting of crystalline solids? Explain your reasoning.
2. What type of solid does the other graph show? Explain.
a sample of gas occupies 806 ml at 26°c and 998 mmhg. find the volume in liters of the gass at STP
The volume of the gas at STP is equal to 0.966 L.
What is the ideal gas equation?The ideal gas law is described as an equation of the state of an ideal gas. This law states that the product of the volume and pressure of one mole gas is equal to the product of the gas constant and absolute temperature.
The mathematical expression of the ideal gas law is as follows:
PV = nRT
where n is the amount of substance, P is the pressure, V is the volume, and R is the gas constant.
Given, volume of gas, V = 806 ml = 0.806 L
The temperature of gas, T = 26° C = 299 K
The pressure of gas, P = 998 mmHg = 1.313 atm
The number of moles of given gas, n = PV/RT
n = 1.313 ×0.806/(0.082 × 299)
n = 0.043 mol
The temperature of gas at STP, T = 273.15 K, pressure at STP, P = 1 atm
The value of the gas constant, R = 0.082 atmL/K mol
Substituting the values n, R, P, and T in the ideal gas equation, we get:
1 × V = 0.043 × 0.082 × 273.15
V = 0.966 L
Learn more about ideal gas equation, here:
brainly.com/question/3637553
#SPJ2