The variables in the experiment are controlled, independent, and dependent. In baking the cake the temperature is independent, and the time to bake is the dependent variable. Thus, option D is correct.
What is an independent variable?An independent variable is a value or a parameter that can be manipulated and altered to analyze its effect on the experiment and its constituents. They do not get influenced by other variables.
The temperature of the oven is the independent variable as it determines the rate at which the cake gets baked. It affects the dependent variable like the time required for the cake to get baked.
An independent variable is a cause that varies the dependent variable and its effect. It is not a constant value and hence gets changed according to the need.
Therefore, option. D. temperature of the oven is an independent variable.
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Your question is incomplete, but most probably your full question was, The higher the temperature of the air in the oven, the faster a cake will bake. Identify the independent variable.
A. Time needed to bake the cake
B. Type of oven
C. Cake flavor
D. Oven temperature
how many valence electron do silver have
The number of valence electron in silver is one.
Valence electrons are the electrons that are found in the outermost shell of an atom. They are the electrons that are involved in chemical bonding.
The atomic number of silver is 47, which means that there are 47 protons in the nucleus of a silver atom. The number of electrons in a neutral atom is equal to the number of protons in the nucleus. This means that there are also 47 electrons in a neutral silver atom.
The electron configuration of silver is [Kr] 4d¹⁰ 5s¹. This means that the outermost shell of silver has 1 electron. The 4d¹⁰ electrons are filled, and the 5s¹ electron is the valence electron.
The valence electron of silver is important for its chemical properties. Silver is a good conductor of electricity because the valence electron is easily removed from the atom. This allows silver to form bonds with other atoms and conduct electricity.
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Two identical atoms from Area B bond together. What type of bond will they most likely form
A. Electrostatic
B. Metallic
C. Ionic
D. Covalent
Answer:
Covalent Bonding
Explanation:
If atoms have similar electronegativities (the same affinity for electrons), covalent bonds are most likely to occur. Because both atoms have the same affinity for electrons and neither has a tendency to donate them, they share electrons in order to achieve octet configuration and become more stable.
What is magnesium oxide (A) a molecular compound with properties different from magnesium or oxygen (B) a molecular compound with the same properties as magnesium or oxygen (C) a shiny metal similar to magnesium but with a higher melting point (D) a iconic compound with properties different from magnesium or oxygen
Answer:
D a ionic compound with properties different from magnesium or oxygen.
Explanation:
Control rods are used to prevent uncontrolled chain reactions from happening inside nuclear power plants. Based on what you know about nuclear reactions, which is the most important characteristic a control rod should have?
The size of a minerals crystals depends on what?
_______ is melted rock that does not reach earth's surface; intrusive igneous rocks form as magma slowly cools under the surface.
The blank should be filled with "Magma". Magma is melted rock beneath the Earth's surface. When magma slowly cools underground, it forms intrusive igneous rocks.
Magma is a mixture of molten rock, minerals, and gases that forms beneath the Earth's surface. It originates from the partial melting of rocks in the Earth's mantle or crust due to high temperature and pressure conditions.
When magma rises towards the Earth's surface, it can solidify underground before reaching the surface. This process occurs when the magma cools slowly over a long period of time. As it cools, the minerals within the magma crystallize and solidify to form intrusive igneous rocks. Since this process happens below the surface, intrusive igneous rocks are also known as plutonic rocks.
Intrusive igneous rocks have a coarse-grained texture because the slow cooling allows sufficient time for large mineral crystals to form. Examples of intrusive igneous rocks include granite, diorite, and gabbro. These rocks can be exposed at the Earth's surface through uplift and erosion, revealing the once-buried formations.
how many hydrogen atoms are contained in 167 grams of propane?
Propane is C3H8
So Molar mass propane = 3*12 + 8*1 = 44
No. of moles of propane = 167/44 = 3.795 moles
What are the metric units of volume, mass and density?
According to the Bohr model of the atom, which electron transition would correspond to the shortest wavelength line in the visible emission spectra for hydrogen?
According to the Bohr model of the atom, which was developed by Niels Bohr in 1913, the shortest wavelength line in the visible emission spectrum for hydrogen corresponds to an electron transition from a higher energy level to the second energy level (n = 2).
In other words, it involves an electron moving from an outer orbit to the second innermost orbit.
This transition is responsible for the emission of visible light, specifically the violet or deep blue region of the spectrum. When an electron falls from a higher energy level to the second energy level, it releases energy in the form of a photon with a higher energy, hence a shorter wavelength. The energy difference between the two energy levels determines the frequency and thus the wavelength of the emitted light, with shorter transitions resulting in shorter wavelengths.
This fundamental insight provided by the Bohr model was a significant step in understanding the quantized nature of atomic spectra and laid the foundation for modern quantum mechanics and our understanding of the behavior of electrons in atoms.
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Final answer:
According to the Bohr model of the atom, the electron transition that would correspond to the shortest wavelength line in the visible emission spectra for hydrogen is from the higher-energy orbit (n=3) to the second orbit (n=2).
Explanation:
According to the Bohr model of the atom, the electron transition that would correspond to the shortest wavelength line in the visible emission spectra for hydrogen is from the higher-energy orbit (n=3) to the second orbit (n=2). This transition produces a line with a wavelength of 656 nanometers, which appears as red light. The first line in the Lyman series, which lies in the ultraviolet part of the spectrum, corresponds to a transition from the ground state (n=1) to the second orbit (n=2).
cuales son las leyes de newton
Las leyes de Newton, formuladas por Isaac Newton, se refieren a tres leyes fundamentales que describen cómo los objetos se mueven en respuesta a las fuerzas. Estas incluyen la ley de inercia, la ley de fuerza y aceleración, y la ley de acción y reacción.
Isaac Newton introdujo tres leyes fundamentales que rigen el movimiento de todos los objetos, conocidas como las leyes de Newton. Estas leyes sentaron las bases para la mecánica clásica y son cruciales en el estudio de la dinámica y la física en general.
Primera Ley de Newton o Ley de Inercia:
Establece que un objeto permanecerá en su estado de movimiento, ya sea en reposo o moviéndose con velocidad constante, a menos que una fuerza externa neta actúe sobre él.
Segunda Ley de Newton o Ley de Fuerza y Aceleración:
La aceleración de un objeto es proporcional a la fuerza neta ejercida sobre el objeto, inversamente proporcional a su masa, y en la misma dirección que la fuerza neta aplicada.
Tercera Ley de Newton o Ley de Accion y Reaccion:
Cuando un objeto ejerce una fuerza sobre otro, el segundo objeto ejerce una fuerza sobre el primero que es igual en magnitud y opuesta en dirección. Las acciones mutuas de dos cuerpos siempre son iguales y dirigidas en sentidos opuestos.
Answer for 15 points!
Brass is a solution made of zinc dissolved in copper.
Zinc is the _____ and copper is the _____ in this solution.
A. solvent; solute
B. solute; solvent
C. element; compound
D. compound; element
The answer B. solute; solvent
A compound has a molar mass of 44.01 g/mol. What is its identity?
This problem is very vague since no other details are given. However for the sake of calculation let us assume that the compound is an ideal gas at STP.
So that the molar volume is: 1 mole = 22.4 L
density = (44.01 g/mol) * (1 mol / 22.4 L) = 1.96 g/L = 1.96 kg/m^3
Answer:
CO2
Explanation:
Carbon has a mass of 12.011 on the periodic table
Oxygen has a mass of 15.999 on the periodic table.
Well, there's one carbon and two oxygens in the compound CO2, and when you complete 12.011+15.999(2), you get 44.01 g/mol
Answer:
CO2
Explanation:
Carbon has a mass of 12.011 on the periodic table
Oxygen has a mass of 15.999 on the periodic table.
Well, there's one carbon and two oxygens in the compound CO2, and when you complete 12.011+15.999(2), you get 44.01 g/mol
Which are homogeneous mixtures? Check all that apply.
vinegar
trail mix
orange juice with pulp
sugar water
sand
soda pop in a sealed bottle
Vinegar
Sugar water
Soda pop in a sealed bottle
Answer:A,D,F
Explanation:
Which method would be best to separate a mixture of oil and water? separation by density separation by particle size filtration distillation
The most effective method to separate oil and water is by using density differences with a separatory funnel. Distillation is also suitable but more complex. Filtration and separation by particle size are not appropriate for this mixture.
The student asked: Which method would be best to separate a mixture of oil and water?
The best method to separate a mixture of oil and water is separation by density. Since oil and water have different densities, the oil will float on top of the water. Using a separatory funnel, you can pour out the water from the bottom, leaving the oil behind.
Another method that could be used is distillation. Since water and oil have different boiling points, heating the mixture will allow the water to boil and be collected separately from the oil. However, this method is more complex and generally less practical for simple separation tasks.
Filtration and separation by particle size are not effective methods for this type of mixture because both oil and water are liquids and do not have different particle sizes or solid components that can be filtered.
Correct Question - Which method would be best to separate a mixture of oil and water?
separation by density separation by particle size filtration distillationPLEASE ANSWER ASAP!!! D: kate gathered three boxes of the same size made of different materials: glass, clear, plastic, and alunium painted black. she placed them on a window sill in the sun for an hour and then measured the waremth if air in each box. in this experiment, the types of box materials are an A. constant variable B control C dependent variable D independent variable
What is the density of 2.0 g of a substance that has a volume of 5.0 mL?
where are metals, nonmetals and metalloids on the periodic table
Metals are placed on left side of periodic table and middle portion of it.Non-metals are placed on right side while the metalloids are along zig-zag line on right side of periodic table.
What is periodic table?It is the tabular display of elements which are discovered till date may it be natural or man -made.It provides a graphic representation of modern periodic law according to which elements are arranged in increasing order of their atomic numbers.
The table consists of seven horizontal rows called periods and 18 vertical columns called groups. The table has enabled classification of elements based on electronic configuration and atomic numbers.
The table is called periodic because the properties of elements repeat after regular intervals of atomic numbers.Hence ,elements with similar properties fall in same group of the periodic table.
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what is one benefit and one limitation of comparative investigations
If solar panels are placed under the sun at noon, then they will produce more energy than solar panels placed in the sun at dawn. What needs to be added to this statement to make it a hypothesis?
a prediction
an explanation
background information
a measurable outcome
what makes a question able to be answered by science?
SCIENCE HELP PLEASE!!!!!!!!!!!!!!!!!!!!
How many valence electrons are found in one atom of nitrogen (N)?
In writing an element's symbol the first letter is always ________________ and the second letter is ____________________. A) capitalized, capitalized B) not capitalized, capitalized C) capitalized, not capitalized D) not capitalized, not capitalized
Five standard solutions of HBr are prepared by serial dilution in which, at each stage, 10.00 mL are diluted to 150.00 mL. Given that the concentration of the most dilute solution is 2.77 × 10−6 M, determine the concentration of the original HBr stock solution.
Final answer:
The concentration of the original HBr stock solution can be calculated using the dilution equation by accounting for the serial dilution process and the given data on the final concentration and dilution volumes.
Explanation:
To determine the concentration of the original HBr stock solution when five standard solutions are prepared by serial dilution, we use the dilution equation C1V1 = C2V2, where C1 is the concentration of the stock solution, V1 is the volume taken from the stock solution, C2 is the concentration of the diluted solution, and V2 is the volume of the diluted solution. In this case, the final concentration C2 is given as 2.77 × 10−6 M, and each dilution involves diluting a 10.00 mL aliquot to 150.00 mL. Because there are five dilutions, the total dilution factor is (150.00/10.00)5. To find the original concentration C1, we rearrange the dilution equation to C1 = C2 × (V2/V1)n, where n is the number of dilutions, which is 5.you do the opposite operations. 3.17E-6 M (150.0 mL / 10.00 mL) = 4.76E-5 M (150.0 mL / 10.00 mL) = 7.13E-4 M (150.0 mL / 10.00 mL) = 1.07E-2 M (150.0 mL / 10.00 mL) = 0.160 M So the original stock was a 0.160 M HBr solution.
PLEASE HELP!
What are physical combinations of different pure substances that can be separated into their original components by physical means?
A. mixtures
B. elements
C. molecules
D. compounds
The answer is A. Mixtures because they can still be seperated
5.080 x 1016 molecules of hydrogen (gas) to moles
Final answer:
To find the number of moles of hydrogen gas from the given 5.080 \u00d7 1016 molecules, divide by Avogadro's number, resulting in 0.0843 moles of hydrogen gas.
Explanation:
To convert the number of molecules to moles, we use Avogadro's number (6.022 \u00d7 1023 molecules/mol). Given the student has 5.080 \u00d7 1016 molecules of hydrogen gas (H2), we set up a conversion factor to cancel out the units of molecules and leave the units of moles.
The calculation to determine the number of moles from the given number of molecules is:
(5.080 \u00d7 1016 molecules H2) \u00d7 (1 mol H2 / 6.022 \u00d7 1023 molecules H2) = 0.0843 moles H2
This shows that the student has 0.0843 moles of hydrogen gas.
Styrene has the empirical formula CH. it has a molar mass of 104g What is the multiplier to get the molecular formula? A.) 6 B.) 8 C.) 2 D.)4 E.) 10
Answer:
plato answer is b
Explanation:
All atoms of an element always have the same number of
Neutrons
Electrons
Electrons
Protons
Answer: Protons
The answer is the last one.
What are minerals? What kinds of minerals are considered gems? (Site 1)
a__________________ is a landform with high elevation and a more or less level surface