Answer:
The standard unit of mass is the kilogram.
Explanation:
The kilogram is the basic unit of mass in the International System of Units. Among the seven basic units of the International System of Units, kilograms are the only basic unit with a prefix.
The XXVI General Conference on Weights and Measures of 2018 approved the definition of a kilogram based on fixing the numerical value of the Planck constant. The decision entered into force on May 20, 2019.
The total amount of energy in an object is called __________ energy.
A. heat
B. thermal
C. temperature
D. electrical
? please help fast.
The melting of ice cream is an example of which of the following?
Chemical Change
Chemical Property
Physical Change
Physical Proptery
Answer:
It is physical change
Explanation:
The body temperature of humans fluctuates only slightly during the day. This is an example of which characteristic of life?
Calculate the mass of 4.50 moles of Ca3(PO3)4
Answer: 1962.513u
Explanation:
Ca3(PO3)4
Ca = 40.078u
P = 30.97u
O = 16u
1 mole of Ca3(PO3)4 =(3*40.078) + 4[(16*3) + 30.97]
1 mole = 120.234 + 315.88 = 436.114g/mol
If 1 mole = 436.114g/mole
4.5 mole = x?
Cross multiply and make x the subject,
x = 4.5*436.114/1
= 1962.513g/mol
Therefore, 4.5 moles of Ca(PO3)4 equals 1962.513g/mole
To treat certain forms of cancer, physicians may choose to irradiate the body with high-energy radiation. Why does this therapy work?
A man is making chicken noodle soup and has found it to be too salty
What method could he use to make the soup less salty
A. Bring the soup to a boil so that some of the broth evaporates
B. Wait for the soup to get cold and then reheat it
C. Add equal measured amounts of water to the soup
D. Stir the solution while its being heated
Granite was formed slowly as magma cooled. What is the result of the slow cooling?
Smooth texture
Large crystals
Fine grains
Air pockets
Granite was formed slowly as magma cooled. The result of the slow cooling is large crystals. The correct option is B.
What is magma?Magma is the hot molten lava or rocks. It is present in the center of the earth's crust. It is very hot and present in molten form. Due to the very high temperature in between the earth's crust, molten lava is present.
This molten, hot lava came out from the earth's surface in the form of lava from volcanoes. Volcanoes are the mountains that erupt lava. They are present in many places. They erupt when there is an earthquake.
When the magma cooled down, the lava convert into rocks or other minerals. These minerals are formed as large crystals. Because there is an accumulation of air between these rocks.
Thus, the correct option is B. Large crystals.
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The atoms of which element will NOT typically form ions?
a. H
B.Be
C. He
D. F
Answer: Option (C) is the correct answer.
Explanation:
Ions are the species that form when a neutral atom either gains or loses an electron.
For example, atomic number of beryllium is 4 and its electronic distribution is 2, 2. So, in order to attain stability by losing its valence electrons Be will form a [tex]Be^{2+}[/tex] ion.
Whereas atomic number of helium is 2 and its electronic configuration is [tex]1s^{2}[/tex].
Since, it has completely filled octet so, it will neither gain or lose an electron as it is stable in nature. Hence, it will not form ions.
Thus, we can conclude that the atoms He element will NOT typically form ions.
The simple model below is a neutral magnesium (Mg) atom with the element’s most common mass number.
What must happen to an atom of magnesium in order to become a magnesium ion Mg+2?
a. It must lose two neutrons and become a different isotope.
b. It must gain two neutrons and become a different isotope.
c. It must lose two electrons and become an ion.
d. It must gain two electrons and become an ion.
All I know is that it is NOT D
Answer is: c. It must lose two electrons and become an ion.
Magnesium (Mg) is metal from 2. group of Periodic table of elements and has low ionisation energy and electronegativity, which means it easily lose valence electons (two valence electrons).
Magnesium has atomic number 12, which means it has 12 protons and 12 electrons. It lost two electrons to form magnesium cation (Mg²⁺) with stable electron configuration like closest noble gas neon (Ne) with 10 electrons.
Electron configuration of magnesium ion: ₁₂Mg²⁺ 1s² 2s² 2p⁶.
A piece of copper is placed in an unknown solution. After some time, the copper becomes thinner, and the solution becomes blue. Which half-reaction is correctly identified for this reaction? A. Copper is reduced by losing electrons. B. Copper is oxidized by gaining electrons. C. Copper is reduced by gaining electrons. D. Copper is oxidized by losing electrons.
Answer:
Copper is oxidized by losing electrons
Explanation:
Trust me
calculate the number of atoms in 1.004 mol bismuth
To calculate the number of atoms in 1.004 mol of bismuth, multiply the number of moles by Avogadro's number (6.02 x 10^23 atoms/mol). The answer is 6.05 x 10^23 atoms.
Explanation:To calculate the number of atoms in 1.004 mol of bismuth, we can use Avogadro's number. Avogadro's number is approximately 6.02 x 1023 atoms/mol. So, we can calculate the number of atoms as follows:
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To find the number of atoms in 1.004 moles of bismuth, multiply the moles by Avogadro's number (6.022 x 10²³). Hence, there are approximately 6.046 x 10²³ atoms in 1.004 moles of bismuth.
Calculate the number of atoms in 1.004 mol bismuth
To calculate the number of atoms in 1.004 moles of bismuth, you can use Avogadro's number, which is 6.022 x 10²³atoms per mole.
Identify the number of moles given: 1.004 mol
Multiply the number of moles by Avogadro's number:
Number of atoms = 1.004 mol × 6.022 × 10²³ atoms/mol
= 6.046 × 10²³ atoms
Therefore, there are approximately 6.046 x 10²³ atoms in 1.004 moles of bismuth.
Which shows the correct order of steps when using natural gas to generate electricity?
A. Energy is converted → gas is burned → boiling water makes steam → steam turns turbines
B. Gas is burned → boiling water makes steam → steam turns turbines → energy is converted
C. Boiling water makes steam → steam turns turbines → energy is converted → gas is burned
D. Steam turns turbines → gas is burned → energy is converted → boiling water makes steam
The correct order of steps when using natural gas to generate electricity is Gas is burned → boiling water makes steam → steam turns turbines → energy is converted.
What is Energy?This is defined as the capacity and the ability to do work and examples include electrical energy etc.
Natural gas generates electricity by it being burned to convert water to steam after which it turns the turbines and converts to electrical energy.
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Which properties change the composition of a substance?
A. Chemical Properties.
B. Physical properties
C. Chemical and physical properties
D. Neither chemical nor physical
Please help.
What is the mass (in grams) of 8.45 x 1023 molecules of dextrose: C6H12O6 (Mw. 180.16 g/mol)?
The mass of 8.45 x 10^23 molecules of dextrose is calculated by dividing the number of molecules by Avogadro's number to find the moles, and then multiplying by the molar mass, resulting in 252.74 grams.
Explanation:The question asks about calculating the mass of 8.45 x 1023 molecules of dextrose (C6H12O6). To find the mass in grams, we need to know how many moles of dextrose these molecules correspond to and use the molar mass of C6H12O6.
First, we establish the number of moles of dextrose by utilizing Avogadro's number (6.022 x 1023 molecules/mol). This is done by dividing the given number of molecules (8.45 x 1023) by Avogadro's number:
Number of moles = 8.45 x 1023 molecules / 6.022 x 1023 molecules/mol = 1.403 moles.Next, we multiply the number of moles by the molar mass of dextrose to find the mass:Mass = 1.403 moles x 180.16 g/mol = 252.74 g.Therefore, the mass of 8.45 x 1023 molecules of dextrose is 252.74 grams.
When 2 grams of Hydrogen (H2) react with 32 grams of Oxygen (O2) the reaction yields hydrogen peroxide (H2O2). How many grams of H2O2 are produced in the reaction?____
Given information:
Mass of H2 = 2 g
Mass of O2 = 32 g
To determine:
Mass of H2O2 produced
Explanation:
The reaction between H2 and O2 can be given as:
H2 + O2 → H2O2
Based on the reaction stoichiometry:
1 mole of H2 reacts with 1 mole of O2 to form 1 mole of H2O2
# moles of H2 = mass of H2 / molar mass of H2 = 2 g/ 2 g.mol-1 = 1 mole
# moles of O2 = mass of O2/ molar mass of O2 = 32 g/ 32 g.mol-1 = 1 mole
Hence for the given reactant conditions, moles of H2O2 produced = 1
Mass of H2O2 = moles of H2O2 * molar mass H2O2 = 1 mole * 34 g.mole-1 = 34 g
Ans: 34 g of H2O2 is produced in this reaction
Which of the following is an element? A. carbon monoxide gas (CO) B. magnesium chloride salt (MgCl) C. zinc metal (Zn) D. hydrochloric acid (HCl)
in a solution the substance that does the dissolving is called a solute B solvent C saturated D precipitate
the answer is solvent i took the test
Please help with the question
Using the periodic table, choose the more reactive non-metal. S or As
Answer: More reactive non-metal is Sulfur (S).
Explanation:
Non-metals are defined as the elements which have the tendency to gain electrons.
A reactive non-metal is the one which gains electrons easily.
In a periodic table, the reactivity of non-metals increases as we move across a period and decreases as we move down the group.
Sulfur belongs to group 16 and period 3 of the periodic table while Arsenic belongs to group 15 and period 4 of the periodic table.
Hence, Sulfur is a more reactive non-metal.
The measurement of how fast an object moves over a certain amount of time.
A:Velocity
B:Speed
C:Acceleration
D:Displacement
What characteristics do all minerals share? pls help i don't like this :(
Answer:
All minerals are solid, inorganic, naturally occurring and has a definite chemical composition and crystalline structure
Explanation:
Consider the following representation where A and B are reactants.
A + B  products
Which rate law correctly applies to this reaction?
k[A]
k[AB]
k[B]
k[A][B]
Suppose a skier is standing still at the top of a hill.what kind of energy does the skier have
If there are 4 grams of reactant, how many grams of product are produced by the chemical reaction? A) 0 grams B) 2 grams C) 4 grams D) 8 grams
If there are 4 grams of reactant, how many grams of product are produced by the chemical reaction?
C) 4 grams it´s pretty simple
If there are 4 grams of reactant, then 4 grams of product are produced by the chemical reaction. So, option C is correct.
What is law of conservation of mass ?According to the rule of conservation of mass, the total mass of reactants and products in a chemical reaction is equal. For instance, the mass of the finished substance, sodium chloride, is equal to the mass of sodium plus the mass of chlorine that reacts with the sodium.
Use the molecular weight of each extra reactant to convert the quantity into grams. Weight is determined by multiplying the molecular weight by the number of moles.
The law of conservation of mass or matter asserts that matter cannot be generated or destroyed in a chemical process. It is only capable of being changed into another form. As a result, if there are 4 grams of reactant, 4 b of product will be produced.
Thus, option C is correct.
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Balance the following equation CH4+O2—>CO2+H2O
Answer:
[tex]\huge \boxed{\mathrm{CH_4+ 2O_2 \Rightarrow CO_2 +2 H_2O}}[/tex]
[tex]\rule[225]{225}{2}[/tex]
Explanation:
[tex]\sf CH_4+ O_2 \Rightarrow CO_2 + H_2O[/tex]
Balancing the Hydrogen atoms on the right side,
[tex]\sf CH_4+ O_2 \Rightarrow CO_2 +2 H_2O[/tex]
Balancing the Oxygen atoms on the left side,
[tex]\sf CH_4+ 2O_2 \Rightarrow CO_2 +2 H_2O[/tex]
[tex]\rule[225]{225}{2}[/tex]
The balanced chemical equation for the chemical change is CH₄ + 2 O₂[tex]\rightarrow[/tex] CO₂ + 2 H₂O.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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The mixture you separated was a mixture of iron filings, sand, and salt. Based on your understanding of matter, is this mixture a homogeneous mixture or heterogeneous mixture? How do you know?
Homogeneous mixture-the parts are not uniformly mixed
Homogeneous mixture-the parts are uniformly mixed
Heterogeneous mixture-the parts are uniformly mixed
Heterogeneous mixture-the parts are not uniformly mixed
The atomic symbols of nitrogen and oxygen are N and O, respectively. The chemical formula of a particular substance is NO2. Which of the following is a correct description of the substance?
A.
a compound made up of 2 nitrogen atoms and 2 oxygen atoms
B.
an element made up of 2 nitrogen atoms and 2 oxygen atoms
C.
a compound made up of 1 nitrogen atom and 2 oxygen atoms
D.
an element made up of 1 nitrogen atom and 1 oxygen atom
Answer:
The correct answer is option C.
Explanation:
Atomic symbol of nitrogen = N
Atomic symbol of oxygen = O
In the chemical formula = [tex]NO_2[/tex]
The given molecular formula of compound indicate its one molecule is made up of 1 nitrogen atom and 2 oxygen atoms.
A sample containing 0.213g Cl- is dissolved in 50.0ml of water how many moles of Cl- are in the solution?
Answer:
There are 0.006 moles of Cl- in the solution.
Explanation:
To solve this problem you should think in te concept of molar mass, the molar mass of Cl- is 35.45 grs/mol (it has the same mass as Cl, because electrons doesn´t contribute with significant mass). So,
35.45 grs --------- 1 mol Cl-
0.213 grs --------- x = 0.006 moles Cl-
There are 0.006 moles of Cl- in the solution.
How does your body get the energy that it needs to do all of its daily activities? Describe the energy conversion that take place.
The human body gets the energy it needs for daily activities through cellular respiration. Glucose is broken down in the presence of oxygen to produce carbon dioxide, water, and ATP. This energy conversion takes place in several steps, including glycolysis, the citric acid cycle, and the electron transport chain.
Explanation:The human body gets the energy it needs to do daily activities through a process called cellular respiration. This is the conversion of food into energy at the cellular level. During cellular respiration, glucose (a type of sugar) is broken down in the presence of oxygen to produce carbon dioxide, water, and ATP (adenosine triphosphate), which is the main source of usable energy in cells.
Here is the step-by-step process of energy conversion that takes place:
Food is ingested and broken down into smaller molecules. For example, complex carbohydrates like starches are broken down into simple sugars like glucose.Glucose enters the cells and undergoes a series of chemical reactions called glycolysis, which occurs in the cytoplasm. During glycolysis, glucose is converted into pyruvate and a small amount of ATP is produced.If oxygen is present, pyruvate enters the mitochondria where it goes through a series of reactions known as the citric acid cycle and the electron transport chain. These reactions further break down the pyruvate and produce more ATP.At the end of the electron transport chain, oxygen accepts electrons and combines with hydrogen ions to form water.The energy released during these reactions is used to produce ATP, which is then used by cells to power various activities like muscle contractions, nerve impulses, and synthesis of molecules.The human body acquires energy by metabolizing nutrients to form ATP, the energy currency of cells. This energy supports all bodily functions and activities. Excess energy is stored as fat, and the overall process is part of the body's metabolism.
Explanation:Energy Conversion in the Human Body
The human body requires energy to perform various activities ranging from cellular processes to physical labor. Our bodies acquire energy by metabolizing nutrients from food, primarily through a process known as cellular respiration. This process converts the chemical energy present in food into adenosine triphosphate (ATP), which cells utilize to perform functions such as muscle contraction, molecule synthesis, and cellular transport. When we are at rest, the body consumes energy to maintain basic physiological functions like breathing and circulating blood, while during physical activities, much more energy is required to perform useful work.
The flow of energy through living systems, known as bioenergetics, dictates that the energy from food undergoes a conversion process. This includes the breakdown of complex carbohydrates into simple sugars and dietary amino acids into proteins, understanding that some chemical reactions within cells release energy (exergonic) and others require energy (endergonic). The aggregate of these reactions is referred to as metabolism. If we consume more energy than what's needed for daily activities and maintaining body temperature, the excess is stored as fat.
In summary, the conversion of chemical energy from food involves a series of metabolic processes that ultimately result in the generation of ATP, which powers various cellular and bodily functions. It is critical for the maintenance of life and allows humans to perform all manners of work, from the most mundane to the most strenuous of tasks.
Water (h2o) is composed of the same elements as hydrogen peroxide (h2o2). Why do these substances have different properties?