Answer:
b.Phosphorus.
d.Nitrogen.
Explanation:
To know the charge of an ion, we need to consider the octet rule: an atom gains, loses or shares electrons to complete their valence shell with 8 electrons.
Which of the following elements would you expect to form an ion with a charge of negative three?
a.Potassium. NO. K has 1 electron in the valence shell so it loses 1 electron to form K⁺.
b.Phosphorus. YES. P has 5 electrons in the valence shell so it gains 3 electrons to form P³⁻.
c.Aluminum. NO. Al has 3 electrons in the valence shell so it loses 3 electrons to form Al³⁺.
d.Nitrogen. YES. N has 5 electrons in the valence shell so it gains 3 electrons to form N³⁻.
Do you think direct democracy would work in the United States? Why or why not? please help me!!!!!!
Answer:
no, because our nation is just too big. it would be difficult to keep track of votes and find a common ground amongst all the people
Of a cell membrane allows it to control material Entering and leave a cell?
Answer:
The cell membrane is the outer layer of the cell. The primary function of the cell membrane is to regulate what substances enter and leave the cell. The cell membrane is selectively permeable, or "semi-permeable", meaning that the membrane only allows certain substances to enter or leave the cell.
Explanation:
already had this question and this is the correct answer
Answer step by step please
The concentration of solution : 0.2 M
Further explanationGiven
5.6 g Potassium hydroxide(KOH)
500 ml of solution = 0.5 L
Required
The concentration
Solution
Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
MW KOH = 39+16+1=56 g/mol
mol solute(KOH) :
= mass : MW KOH
= 5.6 : 56 g/mol
= 0.1
Molarity :
= 0.1 : 0.5
= 0.2 M
2H2 + 02>2 H20
What is the reaction
Answer: The actual reaction to make water is a bit more complicated: 2H2 + O2 = 2H2O + Energy. In English, the equation says: To produce two molecules of water (H2O), two molecules of diatomic hydrogen (H2) must be combined with one molecule of diatomic oxygen (O2). Energy will be released in the process.
Explanation:
30 POINTS
do you think snow is an ionic compound or a covalent compound? explain
Answer:
Compounds containing two elements (so called binary compounds) can either have ionic or covalent bonding. If a compound is made from a metal and a non-metal, its bonding will be ionic. If a compound is made from two non-metals, its bonding will be covalent.
Explanation:
Can u mark brainliest please luvss!!
Please help me fast, I will give brainliest if correct!
Answer:
C. 24 mol
Explanation:
To say it quickly, 6 moles of C3H8 times 4 moles of HCl is 24. 32 moles of Cl2 times 4/4 moles HCl is 32. Therefore 24 is the correct answer.
(03.06 LC)
Which of the following which techniques can be used to separate a homogeneous mixture into its component parts?
Apply pressure
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Answer:
Pressure should be used to seperate the mixture.
Explanation:
The technique that can be used to separate a homogeneous mixture into its component parts is by applying pressure. The correct option is A.
What is homogenous mixture?A homogeneous mixture is a mixture of compounds that has been thoroughly blended to the point where individual substances cannot be seen.
Each sample of the mixture will contain the same proportions of each substance. Homogeneous mixtures can consist of solids, liquids, gases, or plasmas.
A heterogeneous mixture is made up of distinct substances or phases.
Applying pressure is one method for separating a homogeneous mixture into its constituent parts.
The most common method for separating homogeneous fluid mixtures is distillation. Separation takes advantage of differences in boiling points or volatility between the components of a mixture.
Thus, the correct option is A.
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Why is the collision theory considered to be well- established and highly reliable ?
Answer:
The collision theory considered to be well- established and highly reliable, because it never breaks.
Explanation:
Which sequence of atomic numbers represents elements that have similar chemical properties?
A. 3, 12, 21, 40
B. 4, 20, 38, 88
C. 9, 16, 33, 50
D. 19, 23, 30, 36
Given what we know about elements of the periodic table and their properties, we can confirm that the list with elements that have very similar properties is option B.
How do we know that option B list elements with similar properties?The periodic table has a very specific organization.One of the many ways in which it is organized is by groups. It is often divided into 9 groups, usually color-coded. The elements that are in the same group all share similar properties. Option B lists 4 elements of the Alkaline-earth metals group.Therefore, we can confirm that since option B is the choice that lists all elements pertaining to the same group, in this case, the Alkaline-earth metals, it is the correct option as they will all have very similar properties.
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Given 88.0 grams of Boron, how many atoms of Boron (B) are present?
There are 4.9 × 10²⁴ atoms in 88.0 grams of Boron.
HOW TO CALCULATE NUMBER OF ATOMS:The number of atoms in a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number (6.02 × 10²³). The number of moles in 88.0 grams of Boron can be calculated as follows:no. of moles = 88/10.81
no. of moles = 8.14 moles
The number of atoms in Boron is calculated as follows: 8.14 moles × 6.02 × 10²³= 4.9 × 10²⁴ atoms of Boron.
Therefore, there are 4.9 × 10²⁴ atoms in 88.0 grams of Boron.
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When writing ionic compounds, the _____ is always written first.
Ex: "A" in the generic for of the ionic compound "AZ"
Select one:
a. anion
b. polar molecule
c. acid
d. cation
Sometimes people say that the air is thinner high up on a mountain is that true
Answer:
Yes
Explanation:
As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level. This is what is meant by "thin air".
Answer:
Yes because the air becomes less compressed and is therefore thinner.
Explanation:
why do we say the particles in a rock lying on the ground have kinetic energy and potential energy?
Answer:
the particles of the rock possess kinetic energy as they stay in a place the particles also contain potential energy due to their position and arrangement This form of stored energy is responsible for keeping the particles together
Explanation:
hop it helps
The particles in a rock lying on the ground have kinetic energy and potential energy due to vibration as well as position of particles
The particles of matter are always in constant motion. In this case, the particles of the rock possess kinetic energy as they vibrate on its own place while on the other hand, the particles also contain potential energy due to their position and arrangement of particles.
This form of stored energy is responsible for keeping the particles bonded together so we can conclude that the particles in a rock lying on the ground have both kinetic energy and potential energy due to vibration as well as position of its particles.
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The Earth's axis changes direction (but the angle does NOT change).
is called what ?
Answer:
Axial precession
Explanation:
It happens ever ~26'000 years.
We have a cylinder. Calculate the following:
What is the cylinder's mass?
Data:
Volume: 376.8m3
Mass: x
Density: 1000km/m3
Answer:
mass = 2.65 [nearest hundredth].
Explanation:
Mass = Density / Volume
mass = 1000 / 376.8
mass = 2.653927813163.. ≈ 2.65
Animal cells do NOT
have cell walls. Why do
you think this is an
advantage?
Answer:
Because they don't need them , cell wall which are found in cell, maintain cell shape almost as if each cell has it's own exoskeleton ame this them to stand upright without the need for bones .
Explanation:
15.0 mL of 0.200 M barium chloride solution is mixed with a silver nitrate solution. What mass of silver chloride will be formed?
what do gasses have
Answer:
Explanation:
Gas is a state of matter that has no fixed shape and no fixed volume. Gases have lower density than other states of matter, such as solids and liquids. There is a great deal of empty space between particles, which have a lot of kinetic energy.
Answer:
Gas is a state of matter that has no fixed shape and no fixed volume. Gases have lower density than other states of matter, such as solids and liquids. There is a great deal of empty space between particles, which have a lot of kinetic energy.
Explanation:
Which lists the carbohydrates in order of increasing chemical energy?
a.monosaccharides, polysaccharides, disaccharides
b.disaccharides, monosaccharides, polysaccharides
c.polysaccharides, disaccharides, monosaccharides
d.monosaccharides, disaccharides, polysaccharides
Answer:
d ;)
Explanation:
Answer: D.monosaccharides, disaccharides, polysaccharides
Explanation:
why we need gravity explain in your own words
Answer:
Gravity is very important for us,animals and plants. We could not survive Earth without it. The sun's gravity keeps Earth in orbit around it, keeping us a good distance away from it (the sun). Gravity is holding down our atmosphere and the air we need to breathe along with it.
which two conditions can limit the usefulness of the kinetic-molecular theory in describing gas behavior
Answer:
The two conditions that can limit the usefulness of the kinetic-molecular theory in describing gas behavior are "high pressure" and "low temperatures". At low temperatures or high pressures, real gases deviate significantly from ideal gas behavior.
Explanation:
Brianna only has to answer 20% of her math packet. If there are 70 questions in the packet, how many questions must she answer?
is jewelry gold an element, compound or mixture?
PLEASE HELP!
Prevailing winds cause ocean currents to move in the same direction as the winds
O Claim 1: in all places in the ocean.
O Claim 2: in some places in the ocean.
Claim 3: nowhere in the ocean.
which claim is it?
Answer: due to the nature and complexity of some documents, an accessible version of the ... 1. Grade 6 Science Learning Activity. Ocean, Atmosphere, & Climate Unit ... We started this unit by making initial claims about why Christchurch's air ... Ocean currents move in the same direction as the prevailing wind in some places in the.
Explanation:Ocean water is on the move, affecting your climate, your local ecosystem, and the ... Map of temperature of the North Atlantic Ocean shows the warm Gulf Stream current along the. Winds, water density, and tides all drive ocean currents. ... much of Northern Europe significantly warmer than other places equally as far north.
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Use the portion of the periodic table shown below to answer the questions. (10 points)
A portion of the first three columns of the periodic table is shown. Column one from top to bottom reads 11 sodium 22.990, 19 potassium 39.098, and 37 rubidium 85.468. Column two reads 12 magnesium 24.305, 20 calcium 40.078, and 38 strontium 87.62. Column three reads 21 scandium 44.956 and 39 yttrium 88.906.
Part 1: Name two elements that have the same properties as potassium (K). (4 points)
Part 2: Determine the number of protons, electrons, and neutrons present in an atom of magnesium (Mg). Explain how you determined your answer using complete sentences. (6 points)
Your answer:
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, elements belonging to the same group have same physical and chemical properties.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
Elements belonging to same column have same physical and chemical properties. 2 elements with same properties as K are rubidium and sodium.
Atomic number of magnesium is 12, means magnesium has 12 electrons, 12 protons. Mass number of Mg is 24. So, to find the number of neutrons we have to subtract 12 from 24, which is 12 neutrons.
Therefore, elements belonging to the same group have same physical and chemical properties.
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Which is the molar mass of NH₄MnO₄?
Answer:
Molar Mass, Molecular Weight and Elemental Composition Calculator Enter a chemical formula to calculate its molar mass and elemental composition: Molar mass of NH4MnO4 is 136.9741 g/mol
Explanation:
can you help me with this pls
Answer:
B: Covalent Bond
Explanation:
A covalent bond is the sharing of electron pairs between atoms.
Answer:
D, Ionic Bond
Explanation:
HELP ASAP no longer than 30 seconds
Answer:
Wont show pic sorry
Explanation:
If you can get the pic to work i could solve it for you
Answer:
HR
Explanation:
HR stands for hour
What type of reaction has occurred in the following equation? 2 Na3P O4 + 3 CaCl2 → 6 NaCl + Ca3( PO4) 2
Answer:
it's double displacement reaction
Answer:
Double displacement reaction ( Metathesis)
1.) how many grams is 1.09 moles of Mg3N2?
2.) How many moles are in 7.55 g of KBr?
3.) what is the mass, in grams, of 0.48 moles of Na2O?
4.) how many moles is 14 grams of SrCI2?
Answer:
1. 110 grams
2.0.06 moles
3. 129.1 grams
4. 0.08 moles
Explanation:
