Answer:
b . Irradiated food is shown to not be radioactive.
Explanation:
If it can be proven that irradiated food is not radioactive, then it will effective dispute the idea that irradiated food are less safe to eat.
An irradiated food is one in which ionizing radiations have been employed to improve food quality. Thus, bacteria and other food spoilers can be exterminated from the food. Most irradiated food do not contain radiation and are fit for consumption.If it can be proven, that this is true, then it will challenge the idea that irradiated foods are not safe.
compare the size of F- and Na+ with atomic size of Neon?
Fluorine's atomic configuration is (2,7). As it's charge is -1, it will have 8 electrons in it's outermost shell thus filling its octate. similarly, Sodium loses one electron.
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Directions: count each side of the reaction then Circle yes or no if it follows the law of conservation of mass
Answer:
Explanation:
before the reaction you have K=2 and Cl=4
after the reaction K=2 and Cl=2 so it does not follow the law of conservation
How are the atomic number and the number of protons related to each other?
What are the single sugars that are the building blocks of carbohydrates?
Answer:
Monosaccharides, these are the simplest building block of carbs
Explanation:
P and Q are two substances such that the melting point of P and the boiling point of Q are the same. If P is a solid at a certain temperature, what state will Q be in at the same temperature?
Answer:
Explanation:
Firstly, it should be noted that melting and freezing points are the same. Thus, when a substance melts at a certain temperature, it means it can also start freezing/solidifying at that same temperature. That been said, when the substance P is a solid at a certain temperature, the other compound Q will boil at that same temperature and hence will be a gas at that same temperature.
If P is solid, it simply means that Q must still be in the liquid state.
From the question, we can see that, the melting point of P and the boiling point of Q are the same. The melting point of a substance is the temperature at which the solid turns to liquid while the boiling point of a substance is the temperature at which a liquid turns to a gas.
If P is solid, it simply means that Q must still be in the liquid state. It has not yet started boiling since the melting point of P and the boiling point of Q are the same.
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The mixture and elements of Coffee w Cream and Sugar
what are two ways in which you can increase the potential energy of a marble on ramp
Answer:
You can make the ramp really steep and hold the marble at the top of it
Explanation:
The statement of two ways in which increase the potential energy that is "potential energy is declining, while its kinetic energy is rising. Due to friction, potential energy is also transformed into heat."
What is potential energy?Potential energy is the energy stored in an object due to its location relative to some zero position, that objects can be compressed such as rubber bands, trampolines, and bungee cords are examples of potential energy.
A marble dropped at the top of the ramp seems to have more gravitational force than one discharged further down the ramp, and that potential energy is turned into kinetic energy when the marble is again dropped and begins to roll down the ramp.
Learn more about potential energy here
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yo, i need help. 25 points and brainliest. :|
Answer:
here's your answer...
Explanation:
Full moon, also hey lol.
have a germ-free day.
Here is the electron configuration for Magnesium. How many total electrons are in the 2nd energy level?
Mg: 1s2 2s2 2p6 3s2
Answer:
8 electrons
Explanation:
Magnesium is present on group 2.
It has 2 valence electrons.
Electronic configuration of magnesium:
Mg₁₂ = 1s² 2s² 2p⁶ 3s²
1st energy level contain 2 electrons.(1s²)
2nd energy level contain 8 electrons. (2s² 2p⁶)
3rd energy level contain 2 electrons. (3s²)
3rs energy level of magnesium is called valence shell. It contain two valance electrons. Magnesium can easily donate its two valance electrons and get stable electronic configuration.
It react with halogens and form salt. For example,
Mg + Cl₂ → MgCl₂
What is the half life of quartz??
Answer:
1.36 Myr or 717 kyr.
Explanation:
Answer:
Half life of quartzs means natural decay of radioactive material.
Explanation:
Which equation represents a double replacement reaction?
A) 2 Na + 2 H2O → 2 NaOH + H2
B) CaCO3 → CaO + CO2
C) LiOH + HCl → LiCl + H2O
D) CH4 + 2 O2 → CO2 + 2 H2O
Answer:
C) LiOH + HCl → LiCl + H₂O
General Formulas and Concepts:
Chemistry - Reactions
Synthesis Reactions: A + B → AB Decomposition Reactions: AB → A + B Single-Replacement Reactions: A + BC → AB + C Double-Replacement Reactions: AB + CD → AD + BCExplanation:
Step 1: Define
RxN A: 2Na + 2H₂O → 2NaOH + H₂
RxN B: CaCO₃ → CaO + CO₂
RxN C: LiOH + HCl → LiCl + H₂O
RxN D: CH₄ + 2O₂ → CO₂ + 2H₂O
Step 2: Identify
RxN A: Single Replacement Reaction
RxN B: Decomposition Reaction
RxN C: Double Replacement Reaction
RxN D: Combustion Reaction
describe how metamorphic rocks are formed by heat and pressure
Answer:
Metamorphic rocks form when heat and pressure transform an existing rock into a new rock. Contact metamorphism occurs when hot magma transforms rock that it contacts. Regional metamorphism transforms large areas of existing rocks under the tremendous heat and pressure created by tectonic forces.
Explanation:
Describe the chemical makeup of DNA. (site 1)
Answer:
DNA, or Deoxyribonucleic acid, has three types of chemical component: phosphates, a sugar known as deoxyribose, and four nitrogenous bases which are:
-adenine
-guanine
-cytosine
-thymine.
Two of the bases, adenine and guanine, have a double-ring structure characteristic of a type of chemical called a purine.
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Philip
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I need help can someone please explain to me why this B is the correct answer I have a photo of the question
I know B is the correct answer I just need help knowing why it’s B
Answer:
9 g
Explanation:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
4 16 11 9
4+16 = 20 11+9 = 20
9 gram of water must be produced because according to law of conservation of mass, mass neither created nor destroyed thus on both side of equation mass must be same.
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
Which of the following is a difference between naming ionic and covalent compounds?
Group of answer choices
In ionic compounds the ending of the second element changes to -ide, but not in covalent compounds.
In covalent compounds, the prefix of the first element is always ignored but the prefix in the second element depends on the subscript of the element. In ionic compounds, the subscript on each element does not affect the name of the compound.
In covalent compounds the ending of the second element changes to -ide, but not in ionic compounds.
In covalent compounds, the prefix of the first element and second element depends on the subscript of each element. In ionic compounds, the subscript on each element does not affect the name of the compound.
The difference between naming ionic and covalent compounds is that, in ionic compounds the ending of the second element changes to -ide, but not in covalent compounds.
Ionic compounds are compounds that are formed by the by the transfer of electrons from a metal to a nonmetal. Covalent compounds are formed when electrons are shared between nonmetals.
For ionic compounds, the name of the second element(the nonmetal) often ends in -ide. For instance; sodium bromide, cesium oxide and potassium nitride. This does not apply when naming covalent compounds. The are named based on the subscripts of each element in the compound.
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CO2(g) +H2(g)------>CO(g) + H2O(/)
What is being oxidized?
Carbon
Carbon Dioxide
Oxygen
Hydrogen
Answer:
Srry its so hard
Explanation:
collectiveness leads to a good society? how
Answer:
A good society has a transparent talk, they share all matters related to the society, hence everyone knows what's going on. This is why collectiveness leads to a good society.
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What are the first two levels of cellular organization?
Answer:
Cells and tissue
Explanation:
Cells are the smallest functional units of all living things
Tissue is organic material from which organs and their bodily structures appear
An example of a physical property of an element is the element's ability to what?
Explanation:
Appearance, melting point, density, solubility, polarity
HELP PLEASE!!!!!!!!
If an atom has a diameter of 395 pm,
what is its radius?
Answer:
197.5pm
Explanation:
Given parameters:
Diameter of the atom = 395pm
Unknown:
Radius of the atom =?
Solution:
Radius is the half of diameter;
Radius = [tex]\frac{diameter}{2}[/tex]
Radius = [tex]\frac{395}{2}[/tex] = 197.5pm
How many phases of matter are there? two, three, four or five?
Answer:
There are four phases of matter.
Explanation:
There are the three phases you normally hear about: solid, liquid and gas.
However, there is also a fourth named plasma.
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If a substance has a PH of 7 is it a acid, base or a neutral.
Answer:
Neutral
Explanation:
A pH below 7 is acidic and a pH above 7 is basic, and a pH of 7 is neutral.
At 25ºC, gas in a rigid cylinder with a movable piston has a volume of 145 mL and a pressure of 125 kPa. Then the gas is compressed to a volume of 80. ML. What is the new pressure of the gas if the temperature is held at 25ºC?
Answer:
P2 = 226.6 kPa (Approx)
Explanation:
Given:
Temperature t = 25ºC
Old volume v1 = 145 ml
Old pressure p1 = 125 KPa
New volume v2 = 80 ml
Find:
New pressure p2
Computation:
p1v1 = p2v2
125 x 145 = P2 x 80
P2 = 226.6 kPa (Approx)
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Scientists believe that the earth's core is:
Which of the following contains the same number of electrons as an atom of neon?
Cl-
Li
Li+
02
Answer:
D. [tex] O^{2-}[/tex]
Explanation:
In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
Oxygen has a total number of eight (8) electrons and as such the [tex] O^{2-}[/tex] is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon that has a total number of ten (10) electrons.
Hence, [tex] O^{2-}[/tex] contains the same number of electrons as an atom of neon.
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explain how a motorcar engine produces nitrogen oxides
Answer: combustion causes a chemical reaction between nitrogen and oxygen in the engine.
Explanation:
Nitrogen oxides are produced in combustion processes, partly from nitrogen compounds in the fuel, but mostly by direct combination of atmospheric oxygen and nitrogen in flames. Nitrogen oxides are produced naturally by lightning, and also, to a small extent, by microbial processes in soils.
Answer:
when fuels are burned in vehicle engines high temperatures are reached. at these high temperature nitrogen and oxygen from the air combine to produce nitrogen
Construct the chemical formulas for the ionic compounds.
Ionic compounds are formed from metal and non-metal elements
Further explanationThe chemical formula of compounds (especially ionic compounds) can be determined from the charge of each ion.
Determination of the ionic charge of the constituent elements of the compound can be seen from the electron configuration to achieve stability according to the octet rule
The charge of each ion will be crossed in the compound
Aluminum bromide
Al³⁺ + Br⁻ ⇒ AlBr₃
Magnesium bromide
Mg²⁺ + Br⁻ ⇒ MgBr₂
Sodium sulfide
Na⁺ + S²⁻ ⇒ Na₂S
Sodium nitride
Na⁺ + N³⁻ ⇒ Na₃N