Answer:
Calcium
Explanation:
The number of protons is the atomic number of the element. Number 20 on the periodic table is Calcium.
CH(4)+ 20(2)→ CO2+ 2H(2)O
22.
The reaction shown above is an example of a -
a. synthesis reaction
b. combustion reaction
c. decomposition reaction
d. double displacement reaction
Answer:
Reaction is a Combustion reaction
What kind of bond would form between an iron and an oxygen atom: ionic, covalent, or metallic? What kind of bond would form between two silver atoms: ionic, covalent, or metallic? What happens to the valence electrons in this bond? How do ionization energy and electronegativity help explain why this occurs? 3) What kind of bond would form between two chlorine atoms: ionic, covalent, or metallic? What happens to the valence electrons in this bond? How do ionization energy and electronegativity help explain why this occurs?
Answer:
See explanation
Explanation:
Since iron is a metal and oxygen is a non metal, a bond is formed between the two when electrons are transferred from iron to oxygen. Hence the bond is ionic.
Two silver atoms are held together by metallic bonds. Metallic bond are bond forces that exist between metal atoms in a crystal lattice. The valence electrons in this bond form a cloud. Metals have low ionization energy and low electronegativity hence they loose electrons easily. This accounts for the nature of the metallic bond.
The bond formed between two chlorine atoms is a covalent bond. The valence electrons in this bond are localized between the two chlorine atoms. Chlorine is a nonmetal hence it has a high ionization energy and high electronegativity. Hence it forms covalent bonds in which electrons are shared between bonding atoms.
20 POINTS PLEASE HURRY At the center, 6 unmarked red balls are interspersed with 4 blue balls marked with plus signs. A green cloud with 2 concentric white lines surrounds the center, with 2 small green balls marked with minus signs on the inner white line and 2 small green balls marked with minus signs on the outer white line.
How many neutrons does this atom have?
4
6
10
14
Answer:
6
Explanation:
because newtrons dont have a charge so the red ones in the middle count those and you get 6
Answer:
The answer is 6
Explanation:
Hello, can someone please help me with this science question I have? because my class starts in 5 mins and I didn't finish it and no one else is answering my last question. Thanks! BTW the subject is science.
Answer:
Yes they can
Explanation:
But they need pretestino fromadverse temperatures and they need nutrients and also oxygen around the roots
Ahhh helpppp:))))))))))
Answer:
HKOB
Explanation:
hope it helps
At what rate does magma deep below Earth's surface cool? What size of crystal results from magma cooling deep below Earth's surface?
O A. Slowly, large crystals form
B Quickly, large crystals form
C. Slowly, small crystals form
D. Quickly, small crystals form
Answer:
i think it is A
Explanation:
i got this answer from a good friend
The magma deep below Earth's surface cool slowly.Large crystals form results from magma cooling deep below Earth's surface. Therefore, option A is correct.
What is magma ?Magma is the molten or semi-molten natural material that gives rise to all igneous rocks. Magma can be found beneath the Earth's surface, and evidence of magmatism has been discovered on other terrestrial planets and natural satellites.
When magma slowly cools deep within the crust, the resulting rock is known as intrusive or plutonic. Because of the slow cooling, crystals can grow large, giving intrusive igneous rock a coarse-grained or phaneritic texture. Individual crystals in phaneritic texture can be seen with the eye.
Intrusive igneous rocks form when magma slowly cools and solidifies beneath the Earth's surface. Large, well-formed crystals are found in intrusive igneous rocks such as granite, gabbro, diorite, and dunite.
Thus, option A is correct.
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When atoms form ions, they usually _______________ or _______________ enough electrons to achieve the electron ____________________ of a noble gas. Metal atoms ______________ electrons while nonmetal atoms _____________ electrons. The electron dot symbols for
Answer:
when atoms form ions ,they Usually loss or gain enough electrons to achieve the electron Configuration of a noble gas .
Metal atoms loss electrons while non Metal atoms gain electrons .
When atoms form ions, they usually loose or gain enough electrons to achieve the electronic configuration of a noble gas. Metal atoms loose electrons while nonmetal atoms gain electrons.
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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Which of the following statements is true about single-replacement reactions?
1)They are restricted to metals.
2)They involve a three products.
3)Both the reactants and products consist of an element and a compound.
4)Any metal replaces any other metal.
Explanation:
i think is, They involve a three products.
The statement which is true about single-replacement reactions are:
3) Both the reactants and products consist of an element and a compound.
Single-replacement reactions :These reactions are also known as single displacement reactions, in this type, the ions of the metals or elements get exchanged with the other element and lead to the formation of a new product.
Example: [tex]2K+2H_2O--- > 2KOH+H_2[/tex]
The ions of water get exchanged with potassium and form a new salt that is potassium hydroxide.
Thus, option 3 is correct.
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13. Sodium, Na, shows metallic properties. Identify another element that is likely to show similar metallic properties.
Answer:
19.K, potassium
Explanation:
it has all properties of metals
A chipmunk (mass of approximately 1 kg) does push-ups by using a force of 5 N to elevate its center-of-mass by 6 cm in order to do 0.70 Joule of work. If the chipmunk does all this work in 2 seconds, what is its power?
Answer:
Approximately [tex]0.35\; \rm W[/tex] on average.
Explanation:
There are multiple to find power:
Power [tex]P[/tex] is equal to the product of force [tex]F[/tex] and the speed [tex]v[/tex] at which that force moves the object. That is: [tex]P = F \cdot v[/tex].On the other hand, average power [tex]P[/tex] is also equal to the rate at which work [tex]W[/tex] is done. In other words, average power [tex]P\![/tex] is the average work done in unit time. If work [tex]W\![/tex] is done in time [tex]t[/tex], the average power would be [tex]P = W / t[/tex].The question did not state the speed at which the arm of the chipmunk moves. However, the question did state the work done ([tex]W = 0.70\; \rm J[/tex]) and the time required ([tex]t = 2\; \rm s[/tex]).
Therefore, the equation [tex]P = W / t[/tex] seem to be more suitable.
[tex]\begin{aligned}&P\\ &= \frac{W}{t} \\ &= \frac{0.70\; \rm J}{2\; \rm s} \approx 0.35\; \rm W\end{aligned}[/tex].
What coefficient is needed to balance this equation? ____Fe + 4H2O --> Fe6O4 + 4 H2 *
Answer:
the answer is 1
the coefficient needed to balance this equation is 1
Explanation:
HELP ASAP
1. Where are hurricanes most likely to form?
a Over warm tropical waters
b Over frozen Arctic Waters
c Over a tropical rainforest
d Over cool Atlantic Waters
Answer:
Hurricanes are the most violent storms on Earth. They form near the equator over warm ocean waters. Actually, the term hurricane is used only for the large storms that form over the Atlantic Ocean or eastern Pacific Ocean. The generic, scientific term for these storms, wherever they occur, is tropical cyclone.
im going to guess the answer is A, sorry if im wrong.
hope this helps.
How many atoms are in a 0.50 g sample of helium
Calculate the percentage composition of a hypothetical compound, X2Y3. The molar mass of X is 4.53 g/mol and the molar mass of Y is 8.71 g/mol. Round both answers to whole numbers.
Answer:
Explanation: Don't let anyone bring you down you got this you matter, and rock!
A pure substance is one that_____
a. Has been filtered
b. is an element or compound
c. If found in nature
d. Has been cleaned
Answer:
gimme points
Explanation:
During photosynthesis what takes place under the leaf
Answer:
In plants, the process of photosynthesis takes place in the mesophyll of the leaves, inside the chloroplasts. Chloroplasts contain disc-shaped structures called thylakoids, which contain the pigment chlorophyll.
Explanation: Hope this helps
Which is the molar mass of BF3?
hhelp will give brainliest
Answer: pretty sure it is D
Answer:
its the last one
Explanation:
Use the drop-down menus after each statement to identify the dry climate region being described.
v climates feature hot summers and cold winters, dividing the climate into sharply contrasting
seasons.
v climates are characterized by very little rainfall, hot summers, and mild winters.
v climates have annual precipitation between 15 and 25 inches.
Semiarid climate regions have areas of grasslands, called
steppes.
Answer:
✔ semiarid
✔ desert
✔ semiarid
✔ steppes
.
Explanation:
The deserts and steppes comprise the regions that are characterized by dry climates. The dry climates are characterized by very little rainfall, hot summers, and mild winters. The correct option is B.
What is a dry climate?The areas which are very dry and where the water escapes and leaves the area drier than other places is known as the dry climate. Most dry climates have summers very hot, winters cool and warm and the air is very dry.
The main characteristic feature of the dry climate is the low and infrequent rainfall. Arid and semi desert areas have only about 35 cm rainfall per year.
Thus the correct option is B.
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balance the equation KCIO3 → KCl + O2
Answer:
3kcl+ 02
Explanation:
in this way we can balance the chemical equation
What is the percentage of water in the following compound? Answer using three significant figures.
Sodium carbonate decahydrate, Na2CO3 • 10H2O
% by mass H2O
Answer:
63.0
Explanation:
on edge
What is the relationship between Force and Velocity?
Affect/Effect
Cause/Blame
Claim/Reasoning
Cause/Effect
Answer:
Cause/ effect relationship.
Explanation:
because the force is the cause of energy that is present and velocity is the effect (speed) that is present.
Which is most likely to be damaged by an acid? A. A glass jar B. A plastic bottle C. A gold bracelet D. An aluminum can
Answer:
aluminum can
Explanation:
source: trust me bro im currently working on acid and bases and acid doesnt eat through gold
The object which is most likely to be damaged by an acid is Choice D: An aluminium can.
When an acid undergoes ionization in an aqueous solution, the positively charged ion released is; Hydroxonium ion, H30+.
In essence, the hydrogen ion of an acid can be displaced by the Aluminium ion in the aluminium can.This phenomenon is evident in the arrangement of metals in the electrochemical series.Aluminium is more reactive than the hydrogen ion. As such, an Aluminium can is most likely to be damaged by an acid.
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An element in group 3 that is a good conductor of electricity.
Answer:
Well for me I think
Explanation:
it's Aliminium
Answer:
Aluminum is good in heat and conductor
2b. 12 grams of C8H18 react with oxygen to produce carbon dioxide and water. How many grams of CO2 are produced?
12.4
13.5
11.6
37.1
Other:
Answer:
37.1g are produced
Explanation:
The combustion of C₈H₁₈ is:
C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O
Where 1 mole of C₈H₁₈ produce 8 moles of CO₂
To find the mass of CO₂ that is produced we need to convert the mass of C₈H₁₈ with molar mass. Then, with the chemical equation, we can find the moles of CO₂ and its mass, as follows:
Moles C₈H₁₈ -Molar mass: 114.2g/mol-
12g C₈H₁₈ * (1mol / 114.2g) = 0.105 moles of C₈H₁₈
Moles CO₂:
As 1 mole of C₈H₁₈ produce 8 moles of CO₂, 0.105 moles of C₈H₁₈ produce:
0.105 moles of C₈H₁₈ * (8moles CO₂ / 1mole C₈H₁₈) = 0.84 moles of CO₂
Mass CO₂ -Molar mass: 44.01g/mol-:
0.84 moles of CO₂ * (44.01g / mol) = 37.0g of CO₂ ≈
37.1g are producedWhat is the mass of 2.25 mol of the element Iron (Fe)?
Choose the correct set up from the given choices.
a. You would divided 2.25 mol by (55.84 mol divided by 1 gram)
b. You would multiply 2.25 mol by (1mol divided by 55.84 g)
c. You would multiply 2.25 mol by (55.84g divided by 1 mol)
d. You would divide 2.25 mol by (1 mol divided by 55.84g)
Mole measure the number of elementary entities of a given substance that are present in a given sample. To find mass of 2.25 mol of the element Iron (Fe), we multiply 2.25 mol by (55.84g divided by 1 mol). Therefore option c is correct option.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance.
Mathematically,
Mole of Fe element= mass of Fe element÷ Molar mass of Fe element
mass= Mole of Fe element ×Molar mass of Fe element
Substituting the given values in above formula we get
mass= 2.25 mol× 55.84 g/mole
mass= 2.25 mol× 55.84 g/mole
To find mass of 2.25 mol of the element Iron (Fe), we multiply 2.25 mol by (55.84g divided by 1 mol).
Therefore option c is correct option.
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Use your knowledge of modern atomic theory and bonding to explain each of the following experimental observations. (Your explanations should be specific.) Refer to both substances when comparing. Within a family such as the alkaline earth metals, the ionic radius increases as the atomic number increases. The radius of the bromine atom is smaller than the radius of the bromide ion, Br-1. The first ionization energy of aluminum is lower than the first ionization energy of magnesium.
Answer:
(1) In the modern day periodic table the atomic size is increasing when we move down the group and it decreases when we move along the period from left to right. that's why Within a family such as the alkaline earth metals, the ionic radius increases as the atomic number increases. Alkaline earth metals have loosely held electrons which results in its increased size.
(2) The radius of the bromine atom is smaller than the radius of the bromide ion, Br-1 this happens because bromine is a non metal, and it also has a high electronegativity among other group elements as halogen group has high electronegativity. when the bromine acquires one extra electron and forms [tex]Br^-[/tex] ion, the configuration of bromine earlier was [tex]1s^22s^22p^63s^23p^64s^23d104p^5[/tex] but on addition of the electron the p shell will now have 6 electrons resulting in [tex]1s^22s^22p^63s^23p^64s^23d104p^6[/tex]the newly added electron repels the former neutral orientation and as a result of repulsion the size increases.
(3) The first ionization energy of Aluminum is lower than that of the first ionization energy of magnesium because magnesium has fully filled [tex]3s^2[/tex] orbital whereas Aluminum has one electron in the 3p orbitals, fully filled 3s orbitals has strongly held by the nucleus in case of Mg whereas 3p orbitals is shielded from the nucleus therefore it becomes easy to take out 3p electron that 3s electron.
___SeCl6+ ____ O2——> ___ seO2 +___Cl2
If you can do this I need help with more
Answer:
SeCl6 + O2——> seO2 + 3Cl2
Which of the following measurements are recorded to three significant figures? Select all that apply.
Select one or more:
a. 0.003 L
b. 140 g
c. 1,610 s
d. 0.0890 m
Answer:
c) 1610 s
d) 0.0890 m
Explanation:
Significant figures:
The given measurement have four significant figures 1234.
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side when decimal point is present e.g 2400. are also significant. There are four significant figures are present.
a) 0.003 L
This measurement have 1 significant figure which is 3.
b) 140 g
This measurement have 3 significant figure 1, 4. In this measurement 0 is trailing zero that's why it is not consider significant.
c) 1610 s
This measurement have 3 significant figures 1, 6, 1.
d) 0.0890 m
This measurement have 3 significant figures 8,9 and 0
For complete combustion of an organic compound needs 8 molecules of oxygen, what could the formula of this compound be?
Answer:
C5H12.
Explanation:
The compound will be C5H12.
Now consider the general formula for the combustion of an alkane;
CnH2n+2 + 3n+1/2O2-----> nCO2 + (n+1) H2O
If we substitute n=5, we have;
C5H12 + 8O2-----> 5CO2 + 6H2O
Hence the answer above.