PLEASE HELPP!
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?
Answer:
18.18 C
Explanation:
m=55
C=0.45
Q=450zj
ch.temp=?
Q=mct
450 = (55)(.45)T
450 = 24.75
/24.75 = /24.75 (cancels out)
18.18 is the answer
would you rather eat pizza the rest of your life, or cake?
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
Plz answer the first two questions and maybe the third. I will give brainliest.
Answer:
1. 24.45 moles
2. 437.90 grams
Bonus :
0.75 grams
Explanation:
Hope it was helpful ;)
Many diseases can be prevented with a proper diet, exercise, and abstinence from smoking, alcohol, drugs, and sexual activity. True or False( Explain)
Answer:
TrueExplanation:
This is due to multiple reasons. First of which, proper diet with a variety of selection of foods from vegetables, to dairy and meats can provide the body with essential nutrients used to fight off diseases and germs and improve the immune system. Exercise can also help boost the immune system and prevent diseases as well. It can also improve the condition of the heart which prevents heart disease and help the brain (prevent strokes). Drugs, smoking, alcohol and unsafe sexual activity can lead to a multitude of diseases, such as lung cancer, drug addictions, cardiac arrest, blood clots, HIV and other STDs, liver failure, etc. So it would be wise to abstain from those activities.
What would
happen to the
vultures if the
gazelle
decreased?
Answer: If the gazelle population starts to decrease this could lead to some vultures not having enough food to eat
Explanation: This explains the obvious outcome of what would happen.
Hope you do well with what your doing :)
Mark as Brainliest please :)
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.
Answer:
0.067 mole Ag°
Explanation:
Given 7.22 g Ag° = 7.22g Ag/ 107.8g/mol = 0.0670 mole Ag° (3 sig. figs.)
_FeCI3 + _ NaOH = _ NaCI + _Fe(OH)3 balance and strength the coefficients for each substance
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
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
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
See if you can complete the following table using only what is on this page. Hint. Two of the entries are for the same element.
Element
Symbol
Nuclear
Symbol
Atomic Mass
Protons Neutrons
Electrons in
Number Number
Neutral Atom
57
82
138
57
ola
Fe
59
26
Answer and Explanation:
The empty spaces should be completed step-by-step as follows:
First line:
Element symbol: La (it is the corresponding element for the atomic number 57)
Mass number = Atomic number + Neutrons = 57 + 82 = 139
Nuclear symbol: ¹³⁹₅₇ La because the atomic number is 57 and mass number is 139.
Protons: 57 (is equal to the atomic number for a neutral atom)
Electrons in neutral atom = Atomic number = 57
Second line:
Element symbol: La (it is the corresponding element for the atomic number 57 and mass number 138)
Atomic number: 57 (from the Periodic Table, for La)
Mass number = 138 (from the nuclear symbol)
Protons: 57 (is equal to the atomic number for a neutral atom)
Neutrons = Mass number - Atomic number = 138 - 57 = 81
Electrons in neutral atom = Atomic number = 57
Third line:
Atomic number: 26 (from the Periodic Table, for the element Fe)
Protons: 26 (is equal to the atomic number for a neutral atom)
Neutrons = Mass number - Atomic number = 59 - 26 = 33
Nuclear symbol: ⁵⁹₂₆ Fe because the atomic number is 26 and mass number is 26.
A report for a written communication?
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.
Water pollution has severely impacted animals and plants in New York's Hudson
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.
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
Why do you think it would be important for scientists to test local water?
Answer:
It would be important because they will know if the water is infected by some type of disease or harmful bacteria
Explanation:
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
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
how many moles are there in 2.20 x 10^23 molecules of Na2SO4
Answer:
Explanation:
450 grams of Na2SO4? 450 Na soullnol Na2SO4 16.02x1023 molec, Na₂SO4 = 119x1024. | 142.05g Na25041 Imol Naz
Suspensions can be undersaturated.
O True
O False
Answer:
true
Explanation:
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
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 40.9KWhich overall chemical equation is obtained by combining these intermediate equations?
i really need help with this
Answer:
i hope i can help you with this
Answer: focus in class
Explanation:
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How many moles are in 32.8 L of CO gas at STP?
At STP, 1 mole of any gas occupies 22.4 L of space. Since we are given STP conditions here, we can use this ratio to determine the number of moles of CO gas: (32.8 L CO)/(22.4 mol CO/L CO) = 1.51 mol CO.
So, there are 1.51 moles of CO gas.
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
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.
The_____
determines the quantity that can be produced by the reaction.
Answer:
C) limiting reagent
Explanation:
The limiting reagent is the reactant that you don't have a lot of, it will be completely used up in the reaction
Determine the molar mass of a compound that has a density of 1.25 g/L at
STP. *
*
Answer:
So, weight per litre (1.25g/l) times 22.4 l/mole equals the mole weight (28 g/mole).
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
10) Is the chemical equation balanced?
2 Al + Fe2O3
2Fe + Al2O3
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.
Why is the method of using a density bottle more accurate than the measuring cylinder
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:
2. Given the following equation: 2 KCIO3 ---> 2 KCl + 3 O2
How many moles of O2 can be produced by letting 12.00 moles of KClO3 react?
show work. helppp asap
Answer:
18 moles of O2 can be produced by letting 12.00 moles of KClO3 react
Explanation:
The balanced equation is
2KCIO3 ---> 2 KCl + 3 O2
As per the reaction,
2 mole of KClO3 produces 3 mole of O2 gas
Hence, 12 moles of KClO3 will produce [tex]12*\frac{3}{2} =18[/tex]
Hence, 18 moles of O2 can be produced by letting 12.00 moles of KClO3 react
Which vitamin is responsible for ricket disease
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
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
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.)
