Answer:
sin = (330)
csc = (60)
−4 = cot (−45)
Explanation:
im not sure what you were looking for, make me brainlest please?
What is the velocity of a plane that traveled 2,800 miles from New York to California in 5.0 hours?
Answer:
560 mph East
Explanation:
Velocity is just speed with direction pretty much.
Assuming the graphs are constructed to the same scale, which seismograph shows the shortest S-P time?
Answer:
a
Explanation:
what is the empirical formula of a compound that is found to consist of 56% chorine and no other element except iron
Answer:
FeCl₂
Explanation:
Empirical formula is the simplest formula of a compound.
Mass percentage of Chlorine = 56%
Mass percentage Iron = 100 - 56 = 44%
Elements
Fe Cl
Percentage mass 44 56
moles 44/55.85 56/35.5
0.79 1.56
Divide by the smallest
number 0.79/0.79 1.56/0.79
1 2
The empirical formula of the compound is FeCl₂
List two different reasons ants work together
giving brainliest answer it
Answer:
B as its not specific enough
True or False: Water is a liquid at – 5 °C.
Answer:
False
Explanation:
Answer:
False
Explanation:
Water's freezing point is at 0 degrees celsius
When chlorobenzene reacts with Mg in ether followed by CO2 and neutralization with dilute HCl, __________ will be formed.
a. p-chlorobenzoic acid
b. p-deuterobenzoic acid
c. benzoic acid
d. benzene
e. No correct response
Answer:
c. benzoic acid
Explanation:
The given reaction is an example of a Grignard reaction:
When chlorobenzene (C₆H₅Cl) reacts with Mg in ether, an intermediate is formed (C₆H₅MgCl).
Said intermediate then reacts with CO₂ producing a benzoic acid salt (C₆H₅CO₂X), this salt is then neutralized with dilute HCl producing benzoic acid (C₆H₅CO₂H).
please help GIVING brainliest
Answer:
heat wave
Explanation:
A high pressure system is a whirling mass of cool, dry air that generally brings fair weather and light winds. When viewed from above, winds spiral out of a high-pressure center in a clockwise rotation in the Northern Hemisphere.
For the chemical reaction:
N2 (g)
+
H2(g)=
NH3 (g)
Calculate the volume of NH; that will form from 200 dm cubed of N2 at STP. (N = 14; H - 1)
[At STP. 1 mole of any gas occupies volume of 22 A dm cubed
Answer:
Volume of ammonia produced = 398.7 dm³
Explanation:
Given data:
Volume of N₂ = 200 dm³
Pressure and temperature = standard
Volume of ammonia produced = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Number of moles of N₂:
PV = nRT
1 atm× 200 L = n× 0.0821 atm.L/mol.K × 273 K
n = 200 atm.L /22.41 atm.L/mol
n = 8.9 mol
Now we will compare the moles of ammonia and nitrogen.
N₂ : NH₃
1 : 2
8.9 : 2/1×8.9 = 17.8 mol
Volume of ammonia:
1 mole of any gas occupy 22.4 dm³ volume
17.8 mol ×22.4 dm³/1 mol = 398.7 dm³
when a neutral atom gains or loses electrons, it becomes charged and is called ain)!______________
A hypothesis is a
a. concise statement of behavior that is always the same under the same conditions
b. set of quantitative data
C. tentative explanation or predication based upon experimental observations
d. well-tested unifying principle that explains a body of facts
e. mathematical formula that models a pattern of behavior
concise statement of behavior that is always the same under the same conditions
Answer:
the answer is c or d
Explanation:
you can cross out e because it dont make any sense
b thats just data
a is the definition of law
answer two quetions.......
Answer:5.=D
6.=B
Explanation:
Put the elements in order from easiest to hardest to remove an electron. Ba,Be,Ca,Sr.
Answer:
Ba,Sr,Ca,Be
Explanation:
as atomic size increases ionisation potential decreases
Which two photos show electric force in action?
DA.
Answer:
its c and d i just took the test
Explanation:
Electric force is degenerated when papers are attracted onto the comb and when the nails attached to the stone. In both cases a static electricity is generated. Thus, option A and C are correct.
What is static electricity ?When a material is rubbed the electrons gets delocalized and the material gets a negative charge. For instance when comb is rubbed through hair it acquires a negative charge and this when comes in contact with a paper, the paper will attracts on the comb.
The random charges of the paper gets aligned temporarily into two poles by the attraction of electrons from the comb. Thus the positive pole of the comb gets attached to the comb and there creates a static electricity.
The the conducting nails when scratched on the stone a static electricity generates whereas in the case of a bar magnet no electric field is comes in action when it attracts the nails to the magnetic field. Thus, photos A and C are correct.
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Perform the following
mathematical operation, and
report the answer to the correct
number of significant figures.
1.987/3.46 = [?]
Answer:
.574
Explanation:
smallest number of digits in the expression was 3, so the final answer should have 3 sig figs
Suggest reasons for and against the inclusion of hydrogen in the main group of the periodic table
Answer:
See explanation
Explanation:
Hydrogen has only one valence electron. Sometimes, hydrogen is included as part of group 1 or 17 in the periodic table. Is this correct? Well, the answer to this question is not so straight forward!
Let us remember that hydrogen forms a univalent positive ion H^+ just like the group 1 elements, but it also forms a univalent negative ion H^- just like group 17 elements. Also, hydrogen is a gas and forms a molecular diatomic compound just like group 17 elements. This is not the case with other group 1 elements. We can see that hydrogen is chemically and physically dissimilar to other group 1 elements hence one can logically argue against its inclusion in group 1. Also, it is not a halogen, so we can also argue against its inclusion in group 17.
However, it is convenient to include hydrogen in the main groups 1 or 17 when discussing its chemical properties in order to make it easier to assimilate. If we place hydrogen in group 1, we can understand that it forms univalent positive ions. Similarly, if we place it in group 17, we understand that it forms univalent negative ions.
Most times hydrogen is just written separately at the top right corner of the periodic table and not as a member of any group because of the issues outlined above.
Hydrogen is placed in the main group of the periodic table since it has only one electron in it and it also behaves like alkali metal properties.
Hydrogen atom:Hydrogen forms a univalent positive ion [tex]H^+[/tex]group 1 elements, but it also forms a univalent negative ion [tex]H^-[/tex]group 17 elements. Also, hydrogen is a gas and forms a molecular diatomic compound just like group 17 elements.
This is not the case with other group 1 elements. We can see that hydrogen is chemically and physically dissimilar to other group 1 elements hence one can logically argue against its inclusion in group 1. Also, it is not a halogen, so we can also argue against its inclusion in group 17.
If we place hydrogen in group 1, we can understand that it forms univalent positive ions and if it is placed in halogen group it will form univalent negative ion.
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Plzz tell me the answer u need help im kinda confused
All of the following are examples of an external stimulus except -
Group of answer choices
Ⓐ hunger.
Ⓑ sunlight.
Ⓒ a loud sound.
Stimuli are the senses that cause an organism to react. Internal sensations include things like hunger and thirst that are produced inside the body, hence option A is correct.
What is stimulus?A stimulus is a perceptible alteration in the internal or external surroundings of an organism's physical or chemical composition.
Sensitivity is the capacity of an organism or organ to recognize external stimuli and to respond appropriately to them.
A stimulation that comes from outside the organism is known as an external stimulus. Light is one example of an outside stimulation. Although it comes from outside the body, it has an impact there as well.
Therefore, sunlight and a loud sound are the examples of external stimuli, while hunger is an internal stimulus.
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Ethane (CH) is one of many compounds that burns in oxygen to form carbon dioxide and water, as represented by the equation.
2C2H6 + 702 4CO2 + 6H2O
Which substance is a product in this reaction?
Answer:
carbon dioxide and water.
Explanation:
Chemical equation:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
Reactants are present on the left side of chemical equation while products are present on the right side of chemical equation. In given chemical equation ethane and oxygen are reactant while carbon dioxide and water are product.
The given reaction is combustion reaction. Ethane is burnt in the presence of oxygen and produces carbon dioxide and water.
The reaction also follow the law of conservation of mass.
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.
help me in my this plzzz
Answer:
a is oxidation
b is reduction
c is reduction
d is oxidation
hope it helps you
What do you think is responsible for the color produced in the flame, the metal atom or what is attached to the metal atom?
Hint: The metal atom comes first in the formula and the name of the compound.
Answer:
metal Atom
Explanation:
every transition metal atom are responsible for the flame color. Some metal are also confirmed by flame test.
Using the balanced equation below,
how many grams of zinc would be
required to produce 9.65 g of zinc
hydroxide?
Zn + 2MnO2 + H20 → Zn(OH)2 + Mn203
Please help I need it for a test
Answer:
Mass = 6.538 g
Explanation:
Given data:
Mass of zinc hydroxide produced = 9.65 g
Mass of zinc required = ?
Solution:
Chemical equation:
Zn + 2MnO₂ + H₂O → Zn(OH)₂ + Mn₂O₃
Number of moles of zinc hydroxide:
Number of moles = mass/molar mass
Number of moles = 9.65 g/ 99.42 g/mol
Number of moles = 0.1 mol
now we will compare the moles of zinc and zinc hydroxide,
Zn(OH)₂ : Zn
1 : 1
0.1 : 0.1
Mass of zinc required:
Mass = number of moles × molar mass
Mass = 0.1 mol × 65.38 g/mol
Mass = 6.538 g
Answer: 6.35
Explanation:
True or False: Bromine is a gas at – 60 °C
Answer:
False
Explanation:
which one does not share the same properties as the other
Si
Ti
At
Explain why
Answer:
Ti
Explanation:
Ti is titanium and does not share any similar properties with the likes of Si, silicon and At, astatine.
Titanium is a transition metal and a solid. Silicon and Astatine are non - metals. Silicon and Astatine also belongs to the p-block on the periodic table whereas Titanium is found on the d-block. Silicon and Astatine would prefer to take part in reactions where they can gain electrons because they are non metals whereas Titanium due to its metallic property would prefer a reaction where it can lose electrons.How is the name of each element in the periodic table represented? A. The first two letters of the element's name are used for the table. B. Letters are assigned to each element by the scientist who discovered it. C. Letters are given to represent each element based on when it was discovered. D. One or two letters are used to represent the name of each element.
Answer:
D. One or two letters are used to represent the name of each element.
Explanation:
The name of each element in the periodic table is symbolized by one or two letters.
There different ways of achieving this. Sometimes;
the first letter of the name of the element is used to represent it for example, hydrogen = H the first two letters are sometimes used, for example Calcium Cathe Latin name is also used for example Gold is Aurum and is represented as Au.These are some of the ways of symbolizing the name of each element
Convert this word equation into a balanced formula equation, please.
Copper (II) nitrate reacts with aluminum to form aluminum nitrate and copper.
Answer:
3Cu(NO3)2 + 2Al —> 2Al(NO3)3 + 3Cu
Explanation:
From the question given above,
Copper (II) nitrate reacts with aluminum to form aluminum nitrate and copper. This can be obtained represent as follow:
Cu(NO3)2 + Al —> Al(NO3)3 + Cu
Thus, we can balance the above equation as follow:
Cu(NO3)2 + Al —> Al(NO3)3 + Cu
There are 2 atoms of N on the left side and 3 atoms on the right side. It can be balance by putting 3 in front of Cu(NO3)2 and 2 in front of Al(NO3)3 as shown below:
3Cu(NO3)2 + Al —> 2Al(NO3)3 + Cu
There are 3 atoms of Cu on the left side and 1 atom on the right side. It can be balance by putting 3 in front Cu as shown below:
3Cu(NO3)2 + Al —> 2Al(NO3)3 + 3Cu
There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Al as shown below:
3Cu(NO3)2 + 2Al —> 2Al(NO3)3 + 3Cu
Thus, the equation is balanced.
Let's say you asked how many moles of O2
are needed to react with 24 moles of C2H6.
Answer:
7
Explanation:
An ideal gas, consisting of n moles, undergoes an irreversible process in which the temperature has the same value at the beginning and end. If the volume changes from Vi to Vf, the change in entropy is given by:
Answer:
ΔS = nR(In (Vf/Vi))
Explanation:
We are told the temperature has the same value and therefore it's constant.
Formula for change in entropy isothermally is;
ΔS = nR(In (V2/V1))
V2 is final volume and V1 is initial volume.
We are told that the volume changes from Vi to Vf.
Thus, V2 = Vf and V1 = Vi
Hence;
ΔS = nR(In (Vf/Vi))
What is the role of an R group in an amino acid?
A.) It represents the core group that is common to all amino acids.
B.) It gives all amino acids the same physical and chemical properties.
C.) It is the functional group that distinguishes one amino acid from another.
D.) It is the site where other amino acids bond to form polypeptide chains.
Answer:
C.) It is the functional group that distinguishes one amino acid from another.
Explanation:
An R group is also known as a random group and is one of the key components of an amino acid. It contributes to their wide variety.
The role of an R group in an amino acid as It is the functional group that distinguishes one amino acid from another. Option C is correct.
What are functional groups?The functional groups are the some groups of chemicals oh hydrogen and notrgen and oxygen or carbon combination like carboxylic acid they are combination of carbon and amines as they are amnio groups etc.
The R attached at the end represents the different functional gropus of amino acids in the chain of hydrocarbon compound or orgamic compounds as they are primay and secondry and tertiary amines.
Therefore, Option C is correct.The role of an R group in an amino acid as It is the functional group that distinguishes one amino acid from another.
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jagsir saw his mother adding dried neem leaves to the metal vessel filled with wheat. jagsir asked the reason for this from his mother. what would be his mothers reply?
Answer:
Because i want to. would be the reply
Explanation:
VOTE ME BRAINLIEST PLSSSSSSSSS
Answer:
none of the above
option d
solve the equation: 3)15.000 cm²= x dm ²
BRAINLIEST!!!!
Answer:
x = 150 dm
Explanation:
10 cm = 1 dm
100 cm² = 1 dm²
15,000 cm² = 150 dm²
Answer:
csc = (60)
cos = (390)
−4 = cot (−45)
Explanation:
make me braienst please?