Answers
Answer:
c
Explanation:
this is because it makes sense
Answer:
d
Explanation:
Related Questions
Which vitamin is responsible for ricket disease
Answers
Answer:
Explanation:
Vitamin D deficiency rickets can be caused by a lack of vitamin D in the diet, a lack of exposure to the sun, or malabsorption syndromes such as celiac disease, in which there is an inability of the intestines to adequately absorb nutrients from foods.
Risk Factors: Diet (nutrition); Dark skin
Do not abuse or misuse any piece of drawing instrument. ASAPPPP
Answers
A report for a written communication?
Answers
Answer:
It is a document that promotes essential communications, such as communications organizations.
Explanation:
There are several models of written report for communicating. Reports are documents widely used in organizations, whose communication is an essential tool for the correct flow of business. Some of them are written in the form of e-mails, memos, letters, etc.
The reports assist in business communication and must be written in the format and specific subject for the recipient.
The company's need to issue written reports is to assist in the organization of the business, in planning, in decision-making, and in everything that concerns the operationalization of organizational systems.
A chemist weighed out 7.22 g of silver. Calculate the number of moles of silver she weighed out.
Be sure your answer has the correct number of significant digits.
Answers
Answer:
0.067 mole Ag°
Explanation:
Given 7.22 g Ag° = 7.22g Ag/ 107.8g/mol = 0.0670 mole Ag° (3 sig. figs.)
a 55g block of metal has a specific heat of 0.45 J/g°C. What will be the temperature change of this metal if 450 J of heat energy are added
Answers
Answer:
Change in temperature (Δt) = 18.18°C (Approx.)
Explanation:
Given:
Mass of metal block (M) = 55g
Specific heat of metal (c) = 0.45 J/g°C
Amount of energy added (Q) = 450 J
Find:
Change in temperature (Δt)
Computation:
Using Specific Heat Energy formula
Q = McΔt
450 = (55)(0.45)(Δt)
450 = (24.75)(Δt)
Change in temperature (Δt) = 450 / 24.75
Change in temperature (Δt) = 18.18°C (Approx.)
Calculate the mass of an object that is accelerating 14 M/S to a force of 280N
Answers
Answer:
20 KG
Explanation:
Answer:
20 kg
Explanation:
F = ma
F = 280 N
a = 14 m/s^2
m = F/a = 280/14 = 20 kg
Please help with this one
Answers
Answer:
15g
Explanation:
hope this helped
A cork cell was first observed by Robert Hooke in the year:
O 1556
O 1065
O 1965
O 1665
Answers
Answer:
1665
Explanation:
In 1665, Robert Hooke was the first to observe cork cells and their characteristic hexagonal shape, using the first optical microscope, which was invented by him at that time.
Which one(s) are correct for ionic naming? Select all that apply.
O dicopper trichloride
O iron sulfide
O nickel Il carbonate
O strontium iodide
O carbon dioxide
Answers
Ali says the climate of a town is rainy because it is raining outside today. Is she correct? In one or two sentences, explain why Ali is or is not correct about the climate of the town.
Answers
Answer:
Ali is incorrect.
Explanation:
Ali is wrong because the climate is a study of the weather pattern over a long period of time. You cannot look outside one day and determine the climate because the climate is long-term.
She could say the weather is rainy, because that is short term, but not the climate.
_FeCI3 + _ NaOH = _ NaCI + _Fe(OH)3 balance and strength the coefficients for each substance
Answers
Answer:
FeCl₃ + 3 NaOH ⇒ 3 NaCl + Fe(OH)₃
Explanation:
Let's consider the following unbalanced equation. This is a double displacement reaction.
FeCl₃ + NaOH ⇒ NaCl + Fe(OH)₃
We will start balancing Cl atoms by multiplying NaCl by 3.
FeCl₃ + NaOH ⇒ 3 NaCl + Fe(OH)₃
Then, we will get the balanced equation by multiplying NaOH by 3.
FeCl₃ + 3 NaOH ⇒ 3 NaCl + Fe(OH)₃
When 3.52 g of bismuth oxide (molar mass - 465.96 g/ml) reacts with excess carbon to form 2.91 g of bismuth metal (molar mass-208.98) according to the equation:
Bi2O3(s) + 3C(s) = 2 Bi(s) + 3 CO(g)
24
What is the percent yield of the reaction?
(Answer to 1 decimal place)
25
Answers
10) Is the chemical equation balanced?
2 Al + Fe2O3
2Fe + Al2O3
Answers
Answer: Yes , the equation is balanced.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The given chemical equation is:
[tex]2Al+Fe_2O_3\rightarrow 2Fe+Al_2O_3[/tex]
As the number of atoms on reactant side is equal to the number of atoms on product side, the equation is balanced.
Please could you help me with this question
(No links or spam)
Will give brainliest if correct
Answers
Answer:
first one pure
second one mixture..
Which of these actions increases enthalpy in the air molecules of the Earth's
atmosphere?
A. The air being heated by the sun
B. Trees being planted in the rain forests
C. Carbon dioxide being taken in by plants during photosynthesis
D. People breathing in oxygen
HELP PLS
Answers
Answer:
The air being heated by the sun
Explanation:
Just took the quiz
Answer:
The answer is A (the air being heated by the sun)
Explanation:
A P E X
45. What is the H ion concentration of an aqueous solution
in which the OH-ion concentration is 1 x 10-2 mole
per liter?
A) 1 X 10-14 M
C) 1 x 10-9M
B) 1 x 10-12 M
D) | 10-2M
Answers
Answer:
= 1 X 10⁻⁻¹²M
Explanation:
At 25°C & 1atm [H⁺][OH⁻] = 1 x 10⁻¹⁴ => [H⁺] = 1 X 10⁻¹⁴/[OH⁻] = 1 X 10⁻¹⁴/1 X 10⁻²
= 1 X 10⁻⁻¹²M
What is the force being applied to an object with a mass of 12 KG and an acceleration of 4M/S
Answers
Answer:
48 newtons
Explanation:
Determine the molar mass of a compound that has a density of 1.25 g/L at
STP. *
*
Answers
Answer:
So, weight per litre (1.25g/l) times 22.4 l/mole equals the mole weight (28 g/mole).
Plz answer the first two questions and maybe the third. I will give brainliest.
Answers
Answer:
1. 24.45 moles
2. 437.90 grams
Bonus :
0.75 grams
Explanation:
Hope it was helpful ;)
Please Need help asap
For Al, its atomic number is 13 and its mass number is 27. How many neutrons does it have?
А. 13
B. 14
C. 26
D. 27
E. 40
Answers
Answer:
A
Explanation:
The number of protons and neutrons of an element is the same. the electrons are the only thing that can differ. The atomic number equal the protons and neutrons.
Which overall chemical equation is obtained by combining these intermediate equations?
Answers
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l),
which is the first answer choice.
In essence, all you’re doing here is swapping water vapor for liquid water.
Is anyone good at chemistry if so can someone help me please ?
(NO LINKS)
Answers
The reactions are a bit poorly written. While it's true that aqueous H₂CO₃ is produced in this neutralization reaction, the H₂CO₃ rapidly decomposes to yield CO₂(g) and H₂O(l). Writing the product as H₂CO₃(aq) in the net ionic equation is unnecessarily confusing since it portrays the substance as nonionizing yet water-soluble.
In any case, the Na⁺ and the Cl⁻ are the spectator ions here.
Knives should be stored in cluttered drawers.
True or false
Answers
would you rather eat pizza the rest of your life, or cake?
Answers
Answer:
cake
Explanation:
now here me out, no cake is specified so i can say i want a cake that has pizza on it, take off the pizza, and eat it, this goes with any other food without me having to eat the cake
11.9 g sample of aniline (C6H5NH2, molar mass = 93 g/mol) was combusted in a calorimeter with sufficient of oxygen. If the calorimeter heat capacity is 10.0 kJ/K, how many Kelvin does the temperature increase due to this sample combustion?
4 C6H5NH2 (l) + 35 O2 (g) --> 24 CO2 (g) + 14 H2O (g) + 4 NO2 (g)
ΔHrxn=−12800kJ
Answers
Answer:
The temperature increases in 40.9K
Explanation:
Based on the reaction, 4 moles of aniline in combustion releasing 12800kJ to the surroundings, in this case, to the calorimeter.
To solve this question we must find the heat that releases the sample of aniline finding the moles in the sample.
With the heat released we can find the increase in Kelvin due the combustion as follows:
Moles aniline:
11.9g * (1mol / 93g) = 0.128 moles aniline
Heat released:
0.128 moles Aniline * (12800kJ / 4 moles Aniline) = 409kJ are released
Increasing in temperature:
For each 10.0kJ, the calorimeter increases its temperature in 1K. For 409kJ:
409kJ * (1K / 10.0kJ) =
The temperature increases in 40.9KExplain in detail how low density polyethylene is made
Answers
Answer:
Low-density polyethylene is manufactured by the process of the polymerization of ethylene at very high temperatures in a tubular reactor. In this tubular reactor, high-pressure polymerization allows further copolymerization of ethylene with polar co-monomers. The tubular process has an advantage over autoclave process.
Explanation:
please mark brainliest
Which of the following galaxies do not have a regular structure?
A. Elliptical and barred spiral galaxies
B. Irregular and elliptical galaxies
C. Spiral galaxies
D. Irregular galaxies
Answers
Answer: D
Explanation: Irregular galaxies
Answer:
Your answer is D
Explanation:
Irregular galaxies do not have a regular structure.
3.A binary mixture consisting of 50.7 mol % n-butane (1) and the balance iso-butane (2) enters a flash chamber operating at 9.6 bar and 344 K. Use the truncated virial equation of state (equation 3.36 in the textbook) to estimate the composition of the vapor and liquid phases leaving the flash chamber.
Answers
Why is the method of using a density bottle more accurate than the measuring cylinder
Answers
Answer:
While measuring relative density of liquids, two common method of measuring the volume are a measuring cylinder and a density bottle. Among these two method the density bottle gives more accurate measurement of the volume, resulting in more accurate determination of density or relative density
Answer:
While measuring relative density of liquids, two common method of measuring the volume are a measuring cylinder and a density bottle. Among these two method the density bottle gives more accurate measurement of the volume, resulting in more accurate determination of density or relative density.
Explanation:
. How many grams of lithium are formed from the reaction if you begin with 89.5
grams of copper?
Cu
+
Li2S --> 2 Li +
CUS
Answers
Answer:
179g
Explanation:
Molar ratio for Copper : Lithium is
1:2
If there are 89.5g of copper
Grams for Lithium= 89.5 × 2 = 179g of Lithium
The amount of lithium are formed from the reaction if you begin with 89.5 grams of copper is 19.6 grams.
How do we convert mass into moles?Mass can be converted into moles by using the below equation as:
n = W/M, where
W = given mass
M = molar mass
Moles of 89.5g of copper = 89.5g / 63.5g/mol = 1.4 mol
Given chemical reaction is:
Cu + Li₂S → 2Li + CuS
From the stoichiometry of the reaction, it is clear that
1.4 mole of Cu = produces 1.4 mole of CuS
1.4 mole of CuS = produced by 1.4 mole of Li₂S
1.4 mole of Li₂S = produces 2×1.4=2.8 moles of Li
Mass of 2.8 moles of Li = (2.8mol)(7g/mol) = 19.6g
Hence resultant mass of lithium is 19.6g.
To know more about mass & moles, visit the below link:
https://brainly.com/question/24631381
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