Answer:
108.5
Explanation:
half of 150 is 75 and half of that is 32.5. Add that to 75 and you'll get your answer
112.5 g of iron is present in the alloy.
From the question given above, the following data were obtained:
Percentage of iron (Fe) = 75%
Percentage of other elements = 25%
Mass of the alloy = 150 g
Mass of iron (Fe) =?The mass of the iron present in the alloy can be obtained as follow:
[tex]Percentage = \frac{mass of element }{total mass }\\\\[/tex]
75% = [tex]\frac{mass of Fe}{150}[/tex]
[tex]0.75 = \frac{mass of Fe}{150}\\\\[/tex]
Cross multiply
Mass of Fe = 0.75 × 150
Mass of Fe = 112.5 gTherefore, 112.5 g of iron is present in the alloy.
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Daniel needed 5.0 x 10 3mm of copper wire for his senior year science project. When Daniel went to the hardware store, he noticed that the unit of measure used for the wire was meters. Calculate the length, in meters, of copper wire Daniel needed for his project.
Answer:
if its 5X 10^3 mm=5m and if its 5X 10^-3 mm=5X 10^-6m
Explanation:
we know,
1m= 1000mm
as given 5X 10^3 mm we have to convert to meter
now 5X 10^3 mm= 5X 10^3/1000=5m
but if its 5X 10^-3 mm= 5X 10^-3/1000= 5X 10^-6m
thank u,
How are the molecules in the cell membrane arranged? as a lipid bilayer as a protein bilayer as a carbohydrate bilayer as a DNA bilayer
Answer:
as a lipid bilayer
Explanation:
just took the test
Answer:
A. as a lipid bilayer
2. If an eagle is flying at a constant speed, it is accelerating. True or
False
Answer:
False
Explanation:
Answer:
:0
Explanation:
What happens when a Bose-Einstein condensate forms?
A. A large atom is split into many smaller atoms temporarily.
B. The atoms of the solid condense into one large superatom.
C. It causes all matter touching it to condense into a liquid.
D. The electrons separate from the nuclei forming a mass of unbound positive and negative charges.
Answer:
the answer would be B
Explanation:
The atoms of the solid condense into one large superatom. Hence, option B is correct.
What are atoms?An atom contains a central nucleus surrounded by one or more electrons.
Bose-Einstein condensation occurs at a temperature very close to absolute zero i.e 273.15 degrees centigrade. Under such conditions, a large quantity of Boson occupies the lowest quantum state, at which point microscopic quantum phenomena become apparent macroscopically. A BEC is formed by cooling a gas of extremely low density about one hundred thousandth the density of normal air, to ultra-low temperature.
Hence, option B is correct.
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PLEASEE ANSWER FASST
1. A 205 g sample of H20 at 25.0 °C is heated until the temperature reaches 75.0 °C. How many
Joules of heat were required to do this? (remember c = 4.184J/g • °C)
Answer:
i really dont know
Explanation:
byeeeeeeeeeeeee
2. You water three sunflower plants with salt water. Each plant receives a different
concentration of salt solutions. A fourth plant receives pure water. After a
two-week period, the height is measured.
IV
I
DV
CG
Answer:
Independent variable, is the amount of salt water received by each plant
Dependent variable, is the height of each plant
Control group, is the fourth plant that received pure water.
Note: The question is incomplete. The complete question is as follows: For the following experiments, define the independent variable (IV), dependent variable (DV) and control group (CG).
2. You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two-week period, the height is measured.
Explanation:
Independent variable: An independent variable is a variable that an experimenter changes or controls and which has a direct effect on the dependent variable.
In the experiment above, the independent variable is the amount of salt water received by each plant because it is under the control of the experimenter and also is thought to have a direct effect on the height of plants.
Dependent variable: A dependent variable is a variable that is being measured or studied in an experiment, and it depends on the independent variable for its results.
The height of the plants is the dependent variable as it depends on the amount of salt water the plant receives.
Control group: The control group is the group in an experiment or study that does not receive the treatment as the other groups being studied and as such, is not influenced by the independent variable. Therefore, it is used as a standard for the other groups under study.
In this experiment, the control group is the fourth plant that received pure water.
why is it important to conduct scientific tests more than one time
Answer:
you man get different results
The first record of the scientific method being used was approximately
O A) 600 years ago.
O B) 3,000 years ago.
O C) 50 years ago.
O D) 1.200 years ago.
Answer:
600 years ago
Explanation:
it was first recorded by England's Sir Francis Bacon (1561-1626)
Molding a shape from soft, malleable material (clay or plaster) or constructing a shape from harder material (such as metal or paper). Molding is what a child does with Play-Doh or origami.
Complete question is;
Molding a shape from soft, malleable material (clay or plaster) or constructing a shape from harder material (such as metal or paper) is called what?
Molding is what a child does with Play-Doh or origami
Answer:
Modeling
Explanation:
In chemistry, we have a branch called modeling chemistry. In modeling, we organize together a series of models instead of a collection of topics. In this approach, we will begin with a phenomena that can be readily observed and are gradually develop the simplest model of matter that helps us make sense of our observations.
Now in the question, we are Molding a shape from soft, malleable materials like clay/plaster or constructing from harder materials like metal/paper. This means that we are organizing a series of models from either soft & malleable or harder materials to produce a simple model shape.
Thus, this is simply modeling.
Which phrase best describes igneous rocks?
form when lava and magma cool
accumulate sediments following erosion
require heat and pressure to be formed
consist of many sediment layers
Answer:form when magma and lava cool :/
Explanation:hope this helps, and I’m this because ingenious rocks are made/ formed from magma and lava.
The phrase which best describes igneous rocks is option A, .i.e., it forms when lava and magma cool.
What is igneous rock?Igneous rocks are formed by the melting of earth's crust into magma, . The two types of this rocks are, Extrusive and intrusive igneous rocks . The slow cooling of magma beneath the surface results in intrusive igneous rock.
Magma in the crystal is in molten liquid state which heat by convection and flows out. This creates slight movement in plates and the hot mantle the cools down to form igneous crystals.
Extrusive igneous rock is created when lava above the surface cools quickly. The magma hardens more quickly after being brought to the surface via cracks or volcanic explosions. As a result, these rocks are crystalline, smooth, and fine-grained.
Thus regarding the formation of igneous rocks, option A is correct.
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A metal ‘X’ has high melting point, good conductor of electricity, and is most malleable. Then the metal ‘X’ is A) Cu B) Au C) Fe D) Pt
Answer:
A) Cu
(copper)
How many penicillin molecules would you have if you had a total of 36 hydrogen atoms? What would be the total atomic mass?
Answer:
Explanation:
Molecular formula of penicillin = C₁₆ H₁₈ N₂ O₄S
No of hygrogen atoms = 36
No of molecules = 36 / 18 = 2
molecular weight = 334 amu
molecular weight of 2 molecules = 334 x 2 = 668 amu.
What must occur in order for a chemical reaction to be specifically classified as endothermic instead of
exothermic?
Atoms are rearranged.
Chemical bonds are formed.
Energy is released in the form of heat.
Energy is absorbed in the form of heat.
Answer:
A
Explanation:
What must happen in order for a chemical reaction to be specifically classified as endothermic instead of exothermic is that energy is absorbed in the form of heat.
Chemical reactions can be exothermic or endothermic depending on whether it gives off or absorb energy (in the form of heat).
When energy is given off by a reaction, the temperature of the reaction vessel becomes warmer than the initial temperature before the reaction. Such a reaction is said to be exothermic.
For endothermic reactions, heat energy is absorbed from the surrounding. Thus, the reaction vessel appears colder when compared to the initial temperature before the reaction.
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Why carbon dioxide can be tested with the help of moist blue litmus paper ?
Answer:
carbon dioxide is acidic and when it comes in contact with blue litmus paper it turns red
Explanation:
Calculate the volume of a sample of iron that has a density of 6.8 g/mL and a mass of 6780 mg.
Answer:
m= 6780mg = 6.78g = 6.8g
d= 6.8g/ml
V= m/d
V= 1ml
Match the scientist to his contribution to the atomic theory - Thomson - Rutherford - Bohr A. Electron energy levels B. Nucleus C. Electrons
Answer: Thomson - C
Rutherford - B
Bohr - A
Explanation: I just took the quiz
What is the density of 19 milliliters of a liquid substance with a mass of 6.05 grams?
Answer:
The answer is
0.32 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} [/tex]From the question
mass = 6.05 g
volume = 19 mL
The density of the substance is
[tex]density = \frac{6.05}{19} \\ = 0.3184210526...[/tex]
We have the final answer as
0.32 g/mLHope this helps you
1
How many significant figures are there in 9,000,500 mL?
Which shell is the outermost for oxygen?
A 192
B. 292
C. 252P
D. 2P
Answer:
D is the answer
Which two statements describe what happens to energy during cellular
respiration?
A. Some chemical energy is transformed into thermal energy
B. Light energy is transferred to molecules of ATP and used to carry
out life processes
O C. Some thermal energy is transformed into chemical energy
D. Chemical energy is transferred to molecules of ATP and used to
carry out life processes.
Answer:
Chemical energy is transferred to molecules of ATP and used to carry out life processes
AND
Some chemical energy is transformed into thermal energy.
Explanation:
During Cellular respiration, Some chemical energy is transformed into thermal energy and rest Chemical energy is transferred to molecules of ATP and used to carry out life processes.Hence, Option (A) and (D) are correct
What is Cellular rerspiration ?Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert chemical energy from nutrients into adenosine triphosphate, and then release waste products.
Therefore, During Cellular respiration, Some chemical energy is transformed into thermal energy and rest Chemical energy is transferred to molecules of ATP and used to carry out life processes. Hence, Option (A) and (D) are correct
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Which describes a property of water that allows plants to transfer it from their roots to their leaves?
O Water exhibits weak adhesion and cohesion, which allows capillary action to occur.
O Water exhibits strong adhesion and cohesion, which allows capillary action to occur.
Water has low surface tension, which prevents capillary action from occurring.
Water has high surface tension, which prevents capillary action from occurring.
Answer:
B water exhibits weak adhesion and cohesion which allows capillary action to occur.
Explanation:
took the test
Water exhibits strong adhesion and cohesion, which allows capillary action to occur.
What property of water allows it to move through a plant?The cohesive properties of water (hydrogen bonding between adjacent water molecules) allow the column of water to be 'pulled' up through the plant as water molecules are evaporating at the surfaces of leaf cells. This process has been termed the Cohesion Theory of Sap Ascent in plants.
What are adhesion and cohesion?Cohesion and adhesion are two water properties that describe how water molecules interact with each other. and how water molecules interact with other things like leaves or even you. Cohesion means that water likes to stick to itself and adhesion means that water likes to stick to other things.
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What is the formula for Hydroxide
Answer:
OH-
Explanation:
it's consists of an oxygen and hydrogen atom held together by a covalent bond and carries a negative electric charge
This beaker is filled with three liquids of different colors and densities. Which color substance is the most dense? How do you know
Answer:
the one at the bottom
Explanation:
the more dense an object is in this kind of demonstration (which is called a density tower btw) the lower it'd be so taking this reason into consideration the lowest would be the densest
what do isotopes have in common
Answer:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
(if this help pls mark as brainliest :))
Answer:
Number of protons
Explanation:
Isotopes are the same atom of an element with same
number of protons but different number of Neutrons.
Sir Isaac Newton developed a law that describes the gravity between bodies of matter called _________________________________.
Answer:
Universal law of gravitation
What would be the charge of an ion with 9 protons, 10 neutrons, 10 electrons
Answer:
negative
Explanation:
Any atom whose number electrons are more than the number of protons in it will have a negative charge. Since in this case the electrons are 10 and protons are 9 the 9+ charge protons and 9- charge electrons cancel each other giving a final charge of negative.
The charge of an ion with 9 protons and 10 electrons and neutrons is -1 as there is one more electron in comparison to number of protons .
What is an ion?An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.They are attracted to opposite charges.
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What are the three types of symbiosis?
Answer:
commensalim, mutualism, parasitism
HELP PLEASE!!!
Which best represents the law of conservation of mass?
A- mass of reactants > mass of products
B- mass of reactants < mass of products
C- mass of reactants = mass of products
D- mass of reactants -> mass of products
Answer:
c
Explanation:
the input of the mass is always equal to the mass of the outputs
Answer:
The correct answer is C
Explanation:
I did C like they said and it was correct!
Which statement best compares and contrasts lipids and carbohydrates?
Both are used for energy storage, but only carbohydrates are used for long-term energy storage,
Both are used for energy storage, but only carbohydrates are used for short-term energy storage.
Both are used for tissues, but only carbohydrates are used for tissue growth.
Both are used for tissues, but only lipids are used for tissue growth.
Answer:
The answer is B
Both are used for energy storage, but only carbohydrates are used for short-term energy storage.
Explanation:
hope it helps
got it right on edge
i just submitted it and got it right
Both are used for energy storage, but only carbohydrates are used for short-term energy storage.
MACROMOLECULES:
Macromolecules are large or complex molecules made up of monomers. The macromolecules in nature are as follows: proteins, carbohydrates, lipids and nucleic acids. Each macromolecule performs specific functions in the body and hence, are very important. Carbohydrates and lipids are used as energy storage, however, lipids store energy in the body for a long term than carbohydrates. Carbohydrates store energy for a short term because they are readily used by the body.Therefore, both macromolecules are used for energy storage, but only carbohydrates are used for short-term energy storage.
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