Answer:
Explanation:
Calcium and Beryllium are similar to Magnesium because all the three elements belong to the same group and have 2 valence electrons in their outer shell.
Potassium has 19 protons and - since the number of protons is the same as the number of electrons- also 19 electrons. To find out the number of neutrons you have to look at the atomic mass or weight of the element.
kinetic energy is the energy of motion. as kinetic energy increases the particles of the substance move more. describe the changes in kinetic energy at the particle level during the following times
If the half-life of a reaction is 6 days. What percentage of material is left after 18 days?
Show your work
Answer:
12.5% is left
Explanation:If the half-life of a reaction is 6 days. What percentage of material is left after 18 days?
18 days/6 days = 3 half lives
each half life you lose half the material
in 3 half lives you have (1/2)x (1/2) x (1/2) =1/8
1/8 =0.125 so 12.5% is left
twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete?
Explanation:?
Answer:
twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete
Explanation:
twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete
The mass of a 5.00 cm3 sample of gold is 96.5 g. The density of gold is.....?
Answer:
density = mass divided by volume
Explanation:
96.5 divided by 5
=19.3
answer = 19.3 g/cm 3
plz say thanks and brainliest xxx
The electron configuration for nitrogen is 1s22s22p3. What is the electron configuration of the nitride anion
Answer:
1s22s22p6
Explanation:
Nitride anion N3-, has additional 3 electrons than N atom. So just add 3 more to the configuration
p orbitals can occupy a total of 6 electrons so when we add 3 more it becomes 2p6
which atom would be expected to have a half-filled 6p subshell?
Answer:
The Bismuth atom
Explanation:
it contains 83 atoms, 5 of which are valence electrons. These 5 electrons are accommodated in the 6s and 6p orbital.
What do we mean when
we say a substance is
"pure"?
Answer:
a Pure substance contains of only one element or 1 compound
Explanation:
Substances such as Nitrogen, water, and oxygen,
are pure substances because they have a secure chemical composition throughout it's molecules. So basically they are substances or compounds with distinct chemical properties and a constant composition.
Hope this helps have a great night/day!
SOMEONE PLZZ help me on this chemistry test I need to pass it to be able to get my grade up :(((
Answer:
s-2 p-6 d-10 f-14
Explanation:
s orbital max can fit 2 electrons
p orbital max can fit 6 electrons
d orbital max can fit 10 electrons
f orbital max can fit 14 electrons
where do the bulk of the wine industry’s corks come from?
Answer: Cork grows naturally in only two areas of the world: the Mediterranean region of Europe – particularly the Iberian Peninsula, where Portugal and Spain produce more than 80% of the world's cork – and Northwest Africa.
Explanation:
The pressure of a 12ml sample of gas is 1atm at 400K. The temperature is increased the new pressure is 1.5atm. What is the new temperature if volume is constant?
Answer:
600K
Explanation:
P1/T1 = P2/T2
T2 = P2T1/P1
T2 = (1.5atm)(400K)/1atm
T2 = 600K
Why are all the transition elements metallic?
Answer:
coz they have low ionization as well as several empty orbitals in their outer shells ( I think)
What are the properties of PLA plastic PLEASE HELP
Answer:
The Heat Deflection Temperature (HDT) 126 °F (52 °C)
Density 1.24 g/cm³
Tensile Strength 50 MPa
Flexural Strength 80 MPa
Explanation:.
If a student finds the weight of the sodium chloride to be 28.5g
Calculate the number of particles.
( Na=23, C1= 35.5)
The number of particles in 28.5 g of sodium chloride, NaCl is 2.93×10²³ particles
From Avogadro's hypothesis,
1 mole of NaCl = 6.02×10²³ particles
But,
1 mole of NaCl = 23 + 35.5 = 58.5 g
Thus, we can say that:
58.5 g of NaCl = 6.02×10²³ particles
With the above information, can obtain their number of particles in 28.5 g of NaCl. This can be obtained as illustrated below:58.5 g of NaCl = 6.02×10²³ particles
Therefore,
28.5 g of NaCl =
[tex] \frac{28.5 \times 6.02 \times {10}^{23} }{58.5} [/tex]
28.5 g of NaCl = 2.93×10²³ particlesThus, the number of particles in 28.5 g of sodium chloride, NaCl is 2.93×10²³ particles
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how do chemicals in a plant relate to bath bombs?
When a bath bomb comes in contact with water, the baking soda and citric acid react to make carbon dioxide bubbles. This is an acid–base reaction, where baking soda (also called sodium bicarbonate) is a weak base and citric acid is a weak acid.
12. Which of the following would NOT form a covalent bond with oxygen?
A.Nitrogen
B. Carbon
C. Fluorine
D. Neon
E. Chlorine
I think its nitrogen, im not sure tho
Need Help!Chemistry! No links,no guessing please.
Answer:
picture 1:gain electrons and become negative ions.
picture 2:carbon and oxygen have different electronegativities.
picture 3: A
which Substance can be used to Neutralize nitric acid? A Acetic acid C Hydrogen peroxide b milk of magnesia D Ethanol
Answer:B
Explanation:
Which is a positive effect of using chemistry?
O The synthesis of drugs to disease may increase adverse reactions in others.
O The use of herbicides to increase resistance in tolerant plants.
O Fertilizer runoff from farms into natural waters will purify water systems.
O Energy can be generated without burning fossil fuels.
The positive effect of using chemistry is the generation of energy without fossil fuels.
Chemistry is the branch of science that deals with the study of the nature, properties and composition of matter as well as the changes that matter undergoes. Chemistry has really contributed positively to the advancement of the society.
Lately, there has been a lot of emphasis on alternative sources of energy apart from fossil fuels. One such options is the use of hydrogen fuels. Chemistry has been at the forefront of this research.
Hence, one positive effect of using chemistry is that energy can be generated without burning fossil fuels.
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Answer:
its D.
Explanation:
can you guys help me with this one too
A boy is being pushed on a swing. His older sister with a greater mass sits on the swing next. Which statement describes the change in motion if his sister is pushed with the same force?
Answer:
yes he forced up then avoid it
The element phosporus is located to the right of the element magnesium along the same period in the periodic table.
Which best describes the relationship of the elements?
1.Magnesium has a larger atomic number.
2.Phosphorus has a larger atomic mass.
3.Magnesium is in the same category as phosphorus.
4.Phosphorus has similar chemical properties as magnesium.
Answer:
The element phosporus is located to the right of the element magnesium along the same period in the periodic table. Which best describes the relationship of the elements? Magnesium has a larger atomic number.
The Î""G°′ of the reaction is −7.180 kJ·mol−1. Calculate the equilibrium constant for the reaction at 25 °C.
Answer:
Explanation:The Î""G°′ of the reaction is −7.180 kJ·mol−1. Calculate the equilibrium constant for the reaction at 25 °
Based on their electrons dot diagrams, what is the formula for the covalently bonded compound
of nitrogen and hydrogen?
Answer:
Nitrogen, the next nonmetal, has 5 electrons in the valence shell, so it needs to combine with 3 hydrogen atoms to fulfill the octet rule and form a stable compound called ammonia (NH3).
The covalent compound formed from nitrogen and hydrogen is called ammonia with the formula NH₃. Each hydrogen shares its valence electron with three valence electrons of nitrogen.
What is ammonia?Ammonia, NH₃ is a covalent compound formed by the combination of nitrogen and three hydrogen atoms. Nitrogen is a highly electronegative element with 5 valence electrons.
Nitrogen needs 3 more electrons to achieve octet. Hence valency of nitrogen is 3. During chemical bonding it gains three electrons though sharing or donation from metals.
Hydrogen needs one more electron to be stable. Hence, nitrogen shares its three valence electrons each with three hydrogens and each hydrogen in turn shares its one valence electron with nitrogen forming NH₃.
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Give me an atom with the following characteristics.
Halogen
Alkali Metals
Lanthanide series
Transition metal
Alkaline Earth Metals
Nobel gas
Answer:
Explanation:
Halogen: Cl2
Alkali metal: Na
Lanthanide: Promethium
Transition metal: Gold
Alkaline Earth metal: Beryllium
Noble Gas: Neon
The poison dart frog can have bright green, red, blue, or yellow skin that secretes a poisonous substance when it feels threatened. Which type of adaptation does this describe?
Mimicry
Warning coloration
Camouflage
Chemical defense
Answer:
Chemical defense
Explanation:
so we know it cant be mimicry because that means to mimic another animal for defense.
It cant be camouflage because it would be pretty d*mn hard to hide with neon colors.
So that leaves you with chemical defense and warning coloration
Which phrase describes ionization energy?
energy required to remove an electron from an atom
energy required to add an electron to an atom
energy required to break ionic bonds
energy required to form ionic bonds
I need help!! Pls.
Answer:
E
Explanation:
if matter is made of many tiny particles, why does it seem to be continuous? Why doesn’t water seem to behave like sand?
Answer:
Explanation:
if matter is made of many tiny particles, why does it seem to be continuous? Why doesn’t water seem to behave like sand?
Water and some other molecules exhibit a property know as hydrogen bonding. A hydrogen atom in one molecule of water is attracted to the oxygen in a neighboring molecules of water.'
The force of this attraction is less than a standard chemical attractive force, but it is real and measurable.
When billions and trillions of water molecules are held together by this force, the small amount of molecule to molecule force is added up to a tremendous force. That is why even though sulfur is below oxygen on the periodic table, hydrogen sulfide is a gas while hydrogen oxide is a liquid at room temperature.
Hydrogen bonding explains the unique properties of ice, liquid water and steam,We all know water exists in several forms such as solid, liquid and ice. Water boils at 100 C and freezes at 32 F, right? Am I correct? Let us look at some of the chemistry behind forms of water.
The strong polar bond between water molecules creates water cohesion.
As they are cooled, aggregates of most other substances increase monotonically in density becoming progressively heavier -- the colder they are, the more tightly packed their molecules become. But water possesses a peculiar physical feature: ice expands, so it is lighter than liquid water (i. e., ice floats). When water trapped in rock crevices freezes, it breaks rocks (and pipes).
Water is vital to all known life forms, that is, all those on planet Earth. It is so integral to life as we know it that many biologists cannot even envision life without water (although that might be possible). Indeed, the physical properties of water dictate critical thermal limits for living systems.
In one sci-fi story, an alien refers to humans as "ugly bags of mostly water" -- our bodies are about 60-70% water, depending upon how dehydrated we are at any given time. Humans use massive amounts of freshwater to drink, cook, bathe, flush toilets, do laundry, fill swimming pools, irrigate yards and gardens, run flowing fountains, and for recreation. Precious clean water is often wasted, such as when people leave tap water running while washing their hands or brushing their teeth. The personal water consumption of an average American is about 200 gallons per day, but when industrial and energy usage is added in, per capita freshwater usage is more than 2000 gallons/day. People in third world countries use much less water, of course.
Most freshwater is claimed or "owned" and there is not enough to go around. Approximately half of the world's population of people do not even have adequate access to clean drinking water. One of the major symptoms of the human overpopulation crisis is shortages of available fresh water. Wars will be fought over water.
Hydrogen bonding is a property of water and some other molecules. A hydrogen atom in one water molecule is attracted to an oxygen atom in another water molecule.
What is a matter?Matter is a substance composed of various particle types that occupies physical space and has inertia.
According to modern physics principles, each type of particle has a distinct mass and size. The electron, proton, and neutron are the most well-known examples of material particles.
Atoms and molecules are tiny particles that make up solids, liquids, and gases.
This attraction has a lower force than a standard chemical attractive force, but it is real and measurable.
When this force holds billions and trillions of water molecules together, the small amount of molecule to molecule force adds up to a tremendous force.
Thus, due to these bonds, the water does not seem to behave like sand.
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at equilibrium the concentrations of reactants and products are
Answer:
Equal
Explanation:
At equilibrium, the concentrations of the reactants and products will be equal.
Sheila is on the track team and can run 500 yards in 40 seconds. How many meters can she run in 40 seconds?
What is the function of the conventional explosive in an atomic bomb?
Answer:
The gun-type assembly uses a conventional explosive to compress from one side, while the implosion assembly compresses from all sides simultaneously. The immediate energy release per atom is about 180 million electron volts (Me).
Explanation:
