I'm sorry but cant understand if this is a problem or not
Answer:
Yes
Explanation:
Because Dallas is part of Texas
What is the atomic number of an element?
Answer:
Atomic number of an element represents the number of proton each atom within the element contains.
Below is the picture of where on the periodic table is the atomic number located:
Hope this helps!
Answer:
The number of protons in an atom of an element.
Alkali metals are highly since they easily to form ions.
Explanation:
Alkali metals are highly electropositive lements. They readily donate their valence electrons to form ionic compounds
According to the electronic configuration, alkali metals are highly reactive as they have 1 valence electrons and can easily form ions.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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20 POINTS AND BRAINLIEST OLEASE HELP
d. Given the orbital configuration of phosphorus, explain why phosphorus
forms 3 bonds in molecules such as PH3 and PC13. (1 point)
Answer:
The reason why phosphorus usually forms 3 bonds is because of its valence electrons. Phosphorus has 5 valence electrons and due to the octet rule, it will strive to gain 3 more in order to fill it outer shell and become stable. PH3 and PCI3 are great examples of this. In the compound PH₃, The phosphorus atom is in a covalent bond to three hydrogen atoms. Each of the three hydrogen atoms share their one valence electrons with phosphorus, and the phosphorus atoms shares one electron with each hydrogen atom. In the compound PCl₃, one phosphorus atom shares one electron with each chlorine atom, and each chlorine atom shares one electron with phosphorus. Note that each of these compounds are covalent bonds. As show, phosphorus forms 3 bonds because it needs 3 more electrons to become stable.
anyone wanna help me plese
An atom of lithium (Li) and an atom of fluorine (F).
What do you notice about the number of valence electrons in each?
How could these two atoms make each other “happy”?:
Would they still be neutral?:
Answer:
Lithium gives up its one electron to make both atoms happy. So the fluorine atom has eight electrons, and a filled outer shell.
What is Kepler’s second law?
Answer:
Keplers second law was Kepler's laws of planetary motion
Explanation:
Kepler’s second law states that a planet moves in its ellipse so that the line between it and the Sun placed at a focus sweeps out equal areas in equal times.
Which substance elutes first in fractional distillation.
Answer:
distill, the lowest-boiling compond is first
I need help ASAP!!
Nitrogen and carbon can form
bonds in which six electrons (three pairs) are shared.
hexadecimal
o single covalent
triple covalent
ionic
Answer:
Triple covalent
Explanation:
how are silicate minerals different from nonsilicate minerals
Answer: The main difference between silicate minerals and nonsilicate minerals is that silicate minerals are composed of silicate groups whereas Nonsilicate minerals have no silicate groups.
Explanation:
Question 1 (1 point)
Why can a solution be classified as a mixture?
Question 1 options:
Both are made up of two substances that are not chemically combined.
Both are always homogeneous.
It is made up of only one substance.
Both are made up of two substances that are chemically combined.
Question 2 (1 point)
Which choice is an element?
Question 2 options:
air (N2 mixed with O2 , and CO2 )
oxygen (O2 )
sodium chloride (NaCl)
water (H2O )
Question 3 (1 point)
Which choice is a compound?
Question 3 options:
air (N2, O2 mixed with CO2)
carbon (C)
carbon dioxide (CO2 )
oxygen (O2)
Question 4 (1 point)
Which choice is a mixture?
Question 4 options:
carbon dioxide (CO2)
oxygen (O2)
air (N2 mixed with O2 and CO2)
carbon (C)
Question 5 (1 point)
How is a pure substance different from a mixture?
Question 5 options:
A pure substance is heterogeneous.
Pure substances cannot be separated by physical means.
A mixture is made of one substance.
Mixtures cannot be separated by physical means.
Please help!! You get 20 points!
Answer:
Both are made up of two substances that are not chemically combined. oxygen (O2) carbon dioxide (CO2 ) air (N2 mixed with O2 and CO2) Pure substances cannot be separated by physical means.Explanation:
Please count compound list each element and the amount of each and then figure out the total of the atoms
NEED ANSWER ASAP
Answer:
Explanation:
H = 9 You get that from the 3 in front of the phosphoric acid and the 3 behind it.
P = 3 The three in front of the phosphoric acid affects everything.
O4 = 12 The three multiplies by the 4 to get 12
Total number of atoms = 9 + 3 + 12 = 23
It's inorganic. It has no carbons and nothing else you could argue that it makes an organic compound.
When magnesium hydroxide reacts with nitric acid, it produces magnesium nitrate and water. Mg(OH)2 + 2HNO3 → Mg(NO3)2 + 2H2O
In one to two sentences, explain how this reaction demonstrates that matter is neither created nor destroyed in a chemical reaction.
Answer:
The law of conservation of mass states that mass is neither created nor destroyed but the mass of the system must remain constant over time. The total number of atoms in the reactants is equal to the total number of atoms in the product. Therefore, this chemical equation shows that energy is conserved and demonstrates the law of conservation of mass.
To demonstrates that matter is neither created nor destroyed in the chemical reaction the number of atoms or masses in the reactant sides must be equal to the number of atoms or masses of the product side.
The law of conservation of masses states that masses are neither created nor destroyed but can be transformed from one form to another.
In a chemical reaction, it simply means the masses of the reactant will be equal to the masses of the product.
For a chemical equation to obey law of conservation of mass, the equation must be balanced. Therefore,
Mg(OH)₂ + 2HNO₃ → Mg(NO₃)₂ + 2H₂O
Therefore, to demonstrates that matter is neither created nor destroyed in the chemical reaction the number of atoms or masses in the reactant sides must be equal to the number of atoms or masses of the product side.
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What allowed Mendeleev to make predictions of undiscovered elements
Answer:
he predicted the properties from known elements above and belws the unknown in the same group
Explanation:
What allowed Mendeleev to make predictions of undiscovered elements
He realized that an element on this table with one known element above it and one known element below it had to have properties between the two known elements
How did Mendeleev predict gallium and germanium?
Based on gaps in the periodic table Mendeleev deduced that in these gaps belonged elements yet to be discovered. Based on other elements below and above in the same group he predicted the existence of eka-aluminum, eka-boron, and eka-silicon, later to be named gallium (Ga), scandium (Sc), and germanium (Ge).
the surface of the moon is
The moon's surface is covered with dead volcanoes, impact craters, and lava flows, some visible to the unaided stargazer. Early scientists thought the dark stretches of the moon might be oceans, and so named such features mare, which is Latin for "seas" (maria when there are more than one).
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which element is most likely to react with Br
Sr
Ar
K
O
There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. The correct option is option C.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds.
Ionic bonds are formed by elements whose electronegativity difference is very large. Since K has high electronegativity among all given elements so K is most likely to react with Br.
Therefore, the correct option is option C.
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Which set of the electronic structures are only found in metals?
A
2, 1
2, 8, 1
2, 8, 8, 1
B
2,5
2,6
2, 7
C 2,7
2,8,7
2, 8, 18, 7
D
2,8,3
2.8,4
2, 8, 5
Answer:
A... According to the periodic table, elements with one electron at the outermost shell or orbital are classified as alkali METALS
how many bases are needed to code for one amino acid?
Answer:
Three. Also known as a triplet code.
đốt cháy hết 9g kim loại magie Mg trong không khí tích tụ được 15g hợp chất magie oxit MgO. Biết rằng magie cháy là xảy ra phản ứng với khí O2 trong không khí
a, Viết công thức về khối lượng của phán ứng xảy ra
Tính khối lượng của khí oxi phản ứng
Answer:
jijji[ojooooooooooooooooooooooooo
Explanation:
kjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
sample of gas initially occupies 3.0 cc at a pressure of 47.8 mmHg. The pressure is increased to 746 mmHg. What is the new volume
The new (final) volume of the sample of gas is equal to 0.1922 [tex]cm^3[/tex].
Given the following data:
Initial volume = 3.0 [tex]cm^3[/tex]Final pressure = 746 mmHg.Initial pressure = 47.8 mmHg.To determine the new (final) volume of the sample of gas, we would apply Boyle's law:
Mathematically, Boyle's law is given by the formula;
[tex]PV = k\\\\P_1V_1 = P_2V_2[/tex]
Where;
[tex]P_1[/tex] is the initial pressure.[tex]P_2[/tex] is the final pressure.[tex]V_1[/tex] is the initial volume.[tex]V_2[/tex] is the new (final) volume.Making [tex]V_2[/tex] the subject of formula, we have:
[tex]V_2 =\frac{P_1V_1}{P_2}[/tex]
Substituting the given parameters into the formula, we have;
[tex]V_2 = \frac{47.8 \times 3}{746} \\\\V_2 = \frac{143.4}{746}[/tex]
New volume = 0.1922 [tex]cm^3[/tex]
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Lithium and Fluoride be neutral?
2sentence
Answer:
Ionic
Explanation:
Lithium is an alkali metal and form an ionic bond by donating an electron.
Fluorine is a halogen and forms ionic bonds by accepting an electron.
Diagramming the formation of an ionic bond between lithium and fluorine looks exactly like the diagrammed bond between sodium and chlorine in the video below. Lithium behaves just like the sodium (Na) and fluorine will act like the chlorine (Cl).
11. Rutherford fired positively charged alpha particles at gold foil and concluded that most of the mass of an
atom was
a. evenly spread throughout the atom.
b. in rings around the atom
C. in the electrons.
d concentrated in the nucleus.
Answer: D, concentrated in the nucleus.
Explanation: He concluded that most of the mass of the mass of the atom is concentrated at a single place at the centre of atom. He named this place as the nucleus.
Answer:
it's d (concentrated in the nucleus)
Explanation:
If the experiment is repeated at ph 11, the observed activity level of the enzyme will most likely be:
If the experiment is repeated at the pH 11 level, the enzyme activity will be less than at the pH 9 level.
We can arrive at this answer because:
Through the graph, we can see the level of enzyme activity in relation to pH.From pH 5, we can see that as the pH goes up, the enzyme activity goes down.In this case, we can say that if the experiment is repeated at pH 11, the enzyme activity level will be even lower, since from pH 5 onwards, as the pH rises, the enzyme activity goes down.
The question above is incomplete, however, you can see a full version of it in the image below.
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An atom of sodium-23 (Na-23) has a net charge of +1. Identify the number of protons, neutrons, and electrons in the atom.
Answer:
Explanation: Sodium has an atomic number of 11, so it has 11 protons. The atomic mass is 23, so there are 23 − 11 = 12 neutrons. The charge is +1, so there is 1 more proton than electrons, so there are 10 electrons
Explanation:
Explain how a drop of water in a lake (as part of the hydrosphere) can cycle through the atmosphere, geosphere and biosphere.
Answer:
Explanation:
We'll start with a single water molecule, H2O in a lake (hereafter named "WM". A fish swallows WM and it remains there when an eagle catches the fish and carries it to it's nest to feed it's young. WN is transfered to the baby eagle where it circulates in it's blood stream. Eventually WM is excreted and it falls to the forest floor. A tree root absorbs it and it is carried to a leaf where WM plays a role of dissolving minerals for use in the tree's cellulose production. During one of it's trips in the leaf, WM evaporates and leaves the plant as an airborn molecule. Although very happy his his new life above ground, WM absorbs enough of the sun's energy to travel high into the atmosphere. He is joined by many other H2O molecules, but the temperature is much lower than closer to Earth and the water molecules start bumbing into each other. WM is joined by several million other H2O molecules since they are attracted to each other. They This congregation of water molecules first appears as a cloud, and then as a radar blip that the local weather forecaster predicts will turn into rain. The weather forecat is always wrong, but while it did not rain, the temperature was low enough for the clumps of molecules began to drift towards Earth's surface. It is it really cold, they attach themselves to objects, such as trees, cars, humans, etc. that is termed frost or snow. The water eventually returns to Earth as rain, snow, or frost. WM wound up in a lake and was processed through a water treatment plant, sent on his way down a pipe, and found himself in a washing machine. He then travelled to a waste treatment plant and was released back into the same lake lake from which he started.
Given what you know about cyanide poisoning, do you think that giving a person oxygen would be an effective treatment
Answer:
Oxygen will be given to help restore oxygen to your cells, and to prevent more damage. Cyanide antidotes will be used to bind with the cyanide so your body can remove it through your urine.
Explanation:
Yw a brainiest would make me happy your decision :)
A box was measured with three different rulers. Its length was 64.2 cm, its width was 48 cm, and its height
was an impressive 12.385 cm.
Calculate the volume of the box, answering with the correct number of sig figs. Don't forget units and be sure
to show your work!
PLEASE HELP I WILL MAKE BRAINLIEST
64.2cm * 48cm * 12.385cm = 38165.616cm^3
减少到两位有效数字是： 38000cm^3
本题已由中国数学会官方解答（现有会员：2人）
An electron vacuum tube was sealed off in my experiment at a pressure of 8*10^-10 atm. The volume of the tube is 30 dm^3. Find the number of molecules in the tube.
Answer:
[tex]6\times10^{14}[/tex]
Explanation:
[tex]\mathrm{P=8\times10^{-10}}\\\\\mathrm{V=30\:dm^3=30\:L}[/tex]
[tex]\mathrm{pv=nRT}\\\\\mathrm{n=\frac{PV}{RT}=\frac{8\times10^{-10}\times30}{0.0021\times30}}[/tex]
Which strawberries are under a blue filter?
Answer:
strawberries appear red.
Explanation:
In other words, because we know strawberries are supposed to be red, our brain perceives a blue filter over the image and corrects for it, making the strawberries appear red
Which of the following pairs
would most likely form
a covalent bond?
a.Na and C
c. Mg and N
b. Li and CI d. S and F
Answer:
d
Explanation:
because sulphur and fluorine are both non metals
pls help me tell me how to do this question. i only need the answer for the first 2.pls
Answer:
Explanation:
55 and 918
given both a nacl and a h2o molecule, explain what type of bond each compound is and justify your reasoning.
Answer:
NaCl= ionic bond.
H2O=covalent bond.
Explanation:
NaCl:
Happens between metal and non-metal. since metal needs to lose an electron to get a full outer shell of electrons, sodium (Na) loses one electron and has a full outer shell of electrons.
chlorine is a gas so it needs to gain electrons to have a full outer shell. since it is in group 7, it needs to gain 1 electron for a full outer shell of electrons.
the lost electron from sodium is given to chlorine. this creates ions (a charged particle) so it is Na+Cl-. this creates a strong electrostatic attraction between the elements and causes them to join together in a lattice form.
H2O:
Covalent bonds happens between 2 gases. they share an electron or 2, and the bonds are very strong.
since oxygen needs 2 molecules to form a full outer shell. hydrogen have 1 atom in outer shell so they share the electron with the oxygen atom.
I can't fully explain why this is for H2O, but I hope you understand it.
