Answer:
Q = 1672.84 j
c = 0.898 J/g.°C
Explanation:
1) Given data:
Mass of water = 23.0 g
Initial temperature = 25.4°C
Final temperature = 42.8° C
Heat absorbed = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Specific heat capacity of water is 4.18 J/g°C
ΔT = 42.8°C - 25.4°C
ΔT = 17.4°C
Q = 23.0 g × × 4.18 J/g°C × 17.4°C
Q = 1672.84 j
2) Given data:
Mass of metal = 120.7 g
Initial temperature = 90.5°C
Final temperature = 25.7 ° C
Heat released = 7020 J
Specific heat capacity of metal = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 25.7°C - 90.5°C
ΔT = -64.8°C
7020 J = 120.7 g × c × -64.8°C (Negative sign shows heat is released)
7020 J = 7821.36 g.°C × c
c = 7020 J / 7821.36 g.°C
c = 0.898 J/g.°C
whats the importance of stoichiometry?
please write it in ur own words
Answer:
It helps you predict how much of a reactant participates in a chemical reaction
Explanation:
Ethanol is a common laboratory solvent and has a density of 0.7890.789 g/mL. What is the mass, in grams, of 129129 mL of ethanol
Answer:
101.78 g
Explanation:
We know that density is given by; mass/volume
Mass = ?
Density = 0.789 g/ml
Volume = 129 ml
Mass = volume × density
Mass= 129 ml × 0.789 g/ml
Mass= 101.78 g
Which of these is made of atoms from two or more different elements that are joined together chemically to make a molecule?
A. substances
B.elements
C.compounds
D. atoms
Answer: compounds
Explanation:
Compounds are made of atoms of two or more different types of elements, and they can be chemically combined to create a compound. The compound will have molecules from each of the elements you add in the compound. The answer to the question is compounds.
Please help me iv'e been stuck on it for 5 hours and it's science please help me and this better be worth it because i haven't been on brainly and i don't have much points rn so can someone please help me thank you
Answer:
1.)Elements
2.)Compound
3.)Subscript
4.)Formulas
Explanation:
Answer:
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Explanation:
A chemist describes a particular experiment in this way: "0.0400 mol of H2O2 decomposed into 0.0400 mol of H2O and 0.0200 mol of O2." Express the chemistry of this reaction by a conventional equation.
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the
atom's nucleus?
F +25
G +30
H -25
J -30
Answer these to get 75 points
Answer:
2. waves
3. True
4. the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
5. Frequency is the number of occurrences of a repeating event per unit of time.
6. slow, fast
7. left to right
8. The maximum displacement or distance moved by a point on a vibrating body
9. No
10. radio waves, and microwave.
11. tv uses electromagentic waves while light uses electromagenti radition.
Explanation:
Can anything change solutions? Be
specific!
How many moles of calcium atoms are in each mole of calcium carbonate?
1 mole of CaCO3 = 100.086 g
Answer:
The number of moles of calcium atom in each mole of calcium carbonate is 1 mole of calcium atoms
Explanation:
The chemical formula for CaCO₃ = 100.086 g
The number of molecules in one mole of a substance is given by the Avogadro's number, [tex]N_A[/tex] = 6.022 × 10²³ molecules
The number of calcium atoms in one molecule of CaCO₃ = 1 atom of calcium
Therefore, the number of calcium atoms in 1 mole of CaCO₃ = 1 × 6.022 × 10²³ atoms of calcium = 6.022 × 10²³ atoms of calcium
6.022 × 10²³ atoms of calcium = The number of toms in 1 mole of calcium atoms
Therefore, the number of moles of calcium atom in each mole of calcium carbonate = 1 mole of calcium atoms.
what are intermolecular forces
Balance the following equations
Al + Cl2 AlCl3
Ag2O + Be Ag + BeO
K + O2 K2O
CoP + NaBr CoBr3 + Na3P
Si + Hg2S SiS2 + Hg
Li + Ni3N2 Li3N + Ni
Ca + K3N --> Ca3N2 + K
SnS2 + F2 --> SnF4 + S
Answer:
Explanation:
2Al + 3Cl2 --> 2AlCl3
Ag2O + Be -----> 2Ag + BeO
4K + O2 ---> 2K2O
CoP + 3NaBr ---> CoBr3 + Na3P
Si + Hg2S ---> SiS2 + Hg
6Li + Ni3N2 --- > 2Li3N + 3Ni
3Ca + 2K3N --> Ca3N2 + 6K
SnS2 + 2F2 --> SnF4 + 2S
Hypothesis: If a material undergoes a
chemical change, then it will not retain its
original properties because a new substance
is formed.
To test the hypothesis above, you will observe the
changes during the experiment.
To do this, you will use these observations to
compare the___
of the
substances
to the__
substances.
of the
Answer:
I hate to not answer and have you repost this if you could repost it with the choices by clicking the arrow I can figure it out a lot faster and I'll copy and paste to show you that it's right
Explanation:
I'm good with history biology sum math so if you want to do what I asked and reposted I can give you the answers and I will show that they are correct I won't just guess like some people do just to get points cuz I don't care about points I just get on here to help people
Answer: The answer for the blanks is initial appearance and than final appearance.
Explanation:
Question 2/5
The definite chemical composition of a mineral refers to
A. the mineral being created in a chemical laboratory
B. the number of elements from the periodic table that make up the mineral
C. the crystalline structure
D. the solid state of the mineral
Calcium reacts with Hydrochloric acid to produce Calcium chloride and
Hydrogen gas. If we start with 2 g of Hydrochloric acid, how many grams
of Calcium Chloride will we produce?
Answer:
Mass = 2.77 g
Explanation:
Given data:
Mass of HCl = 2 g
Mass of CaCl₂ produced = ?
Solution:
Chemical equation:
2HCl + Ca → CaCl₂ + H₂
Number of moles of HCl:
Number of moles = mass / molar mass
Number of moles = 2 g/ 36.5 g/mol
Number of moles = 0.05 mol
now we will compare the moles of HCl with CaCl₂.
HCl : CaCl₂
2 : 1
0.05 : 1/2×0.05 = 0.025 mol
Mass of CaCl₂:
Mass = number of moles × molar mass
Mass = 0.025 mol × 110.98 g/mol
Mass = 2.77 g
Is acne a physical or chemical change?
Answer:
A... Chemical change?
Explanation:
Im really sorry if this is wrong. Im d u m b
What do oxygen and iron make?
Answer:Iron combines with oxygen to produce rust, which is the compound named iron oxide
Explanation:
Turning _______ a switch completes the circuit.
Answer:
the blank is on.
Turning on a switch completes a circuit.
Explanation:
The wavelength of the violet light emitted from a hydrogen atom is 410.1 nm. This light is a result of electronic transitions between the n = 5 and n = 2 energy levels. How much higher in energy is the n = 5 energy level than the n = 2 energy level?
Select one:
a. 3.000 x 108 J
b. 1.114 x 10-14 J
c. 2.436 x 10-18 J
d. 1.616 x 10-36 J
e. 4.847 x 10-19 J
Answer:
e. 4.847 x 10-19 J
Explanation:
From the given information:
The equation connecting the photon energy and the wavelength is:
[tex]E_{photon } = \dfrac {hc}{\lambda}[/tex]
where;
[tex]planck's \ constant \ (h)[/tex]= 6.626 * 10 ^{-34} J.s
[tex]velocity \ of \ light \ (c)[/tex] = 3.00 * 10^8 m/s
wavelength [tex]\lambda = 410.1 \ nm \times \dfrac{10^{-9} \ m}{1 \ nm}[/tex]
[tex]\lambda = 4.101 \times 10^{-7} \ m[/tex]
To determine the photon energy of violet light
[tex]E_{photon } = \dfrac {(6.626 \times 10^{-34} J/s ) \times (3.00 \times 10^8 \ m/s) }{4.101 \times 10^{-7} \ m}[/tex]
= 4.847 × 10⁻¹⁹ J
Given the balanced equation:
2NO2 —————->N2O4
what mass in grams of n2o4 is produced when 10 moles of no2 is consumed?
a) 153 b) 690 c) 368 d) 460 e) 1150
Answer:
d) Mass = 460 g
Explanation:
Given data:
Mass of N₂O₄ produced = ?
Number of moles of NO₂ consumed = 10 mol
Solution:
2NO₂ → N₂O₄
Now we will compare the moles of NO₂ and N₂O₄.
NO₂ : N₂O₄
2 : 1
10 : 1/2×10 = 5 mol
Mass of N₂O₄ produced:
Mass = number of moles × molar mass
Mass = 5 mol × 92 g/mol
Mass = 460 g
What percent of AgNO3 is silver?
Answer:
63.499%
Explanation:
3. An unknown compound was found to have a molar mass of 75.0 g/mol and to
contain 32.0% carbon, 6.7% hydrogen and 18.7% nitrogen. The rest of the molecule
consists of oxygen. What is the molecular formula of the compound?
Describe two examples of something that has potential energy to do something
Answer: the heavy ball of a demolition machine is storing energy when it is held at an elevated position.
Which has potential energy
Explanation:
Answer: hope u dont mind i think ash answer ur question just imagine i had the correct answer woah UwU
Explanation:
What is the mass of copper chloride in 50 cm' of a 300 g/dm solution?
Answer:
There are 15 grams of copper chloride in 50 cubic centimeters of solution.
Explanation:
The statement is incorrect. The complete sentence will be presented below:
What is the mass of cooper chloride in 50 cubic centimeters of a 300 grams per cubic decimeters?
In Chemistry, a common unit for concentration is grams per cubic centimeter. A cubic decimeter equals 1000 cubic centimeters. First, we convert the given concentration into the requested unit:
[tex]c = 300\,\frac{g}{dm^{3}} \times \frac{1\,dm^{3}}{1000\,cm^{3}}[/tex]
[tex]c = 0.3\,\frac{g}{cm^{3}}[/tex]
Which means there are 0.3 grams of copper chloride per each cubic centimeter of solution.
The amount of mass of copper chloride contained in 50 cubic centimeters of solution is calculated by dimensional analysis:
[tex]m = \left(0.3\,\frac{g}{cm^{3}} \right)\cdot (50\,cm^{3})[/tex]
[tex]m = 15\,g[/tex]
There are 15 grams of copper chloride in 50 cubic centimeters of solution.
Probability can be used
Answer:
How likely something is to happen.
What is the mass of 4.5 moles of Cu(NO3)2?
Answer:
The mass of 4.5 moles of Cu(NO3)2 is 843.55g
Explanation:
Mass = moles x Molar mass
Mass = 4.50(187.55)
= 843.97g
Hi could you please help, i have a test today which will determine my grade
Acid solutions contain hydrogen ions.
Aluminium reacts with dilute hydrochloric acid to form a solution containing aluminium ions Complete the balanced ionic equation for this reaction
Explanation:
the answer is in the attachment
me need answer to da question
Answer:
cells?
Explanation:
What is the specific heat of a 123 g substance that requires 4.56 J of heat in
order to increase its temperature by 12.32 °C?
A) 0.00301 J/g °C
B) 0.457 J/g °C
0 6910 J/g °C
D) 2.19 J/g °C
E) 0.0220 J/g°C
Answer: A. [tex]0.00301J/g^0C[/tex]
Explanation:
The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.
[tex]Q=m\times c\times \Delta T[/tex]
Q = Heat absorbed = 4.56 J
m = mass of substance = 123 g
c = specific heat capacity = ?
Change in temperature ,[tex]\Delta T=T_f-T_i=12.32^0C[/tex]
Putting in the values, we get:
[tex]4.56J=123g\times c\times 12.32^0C[/tex]
[tex]c=0.00301J/g^0C[/tex]
The specific heat of a 123 g substance that requires 4.56 J of heat in order to increase its temperature by 12.32 °C is [tex]0.00301J/g^0C[/tex]
What is not a mass of 1 mole of a substance?
Explanation:
been defined in such a way. It is defined as the numbers of particles in 12 g of 12C. If it were 24 g instead of 12 g, then the weight of 1 mole of substance would equal 2 times the atomic/molecular mass in grams.
5. Calculate the number of moles of potassium nitrate, KNO3, in a sample with a mass of 85.2 grams.
0.843 mol KNO₃
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
85.2 g KNO₃
Step 2: Identify Conversions
Molar Mass of K - 39.10 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of KNO₃ - 39.10 + 14.01 + 3(16.00) = 101.11 g/mol
Step 3: Convert
[tex]\displaystyle 85.2 \ g \ KNO_3(\frac{1 \ mol \ KNO_3}{101.11 \ g \ KNO_3} )[/tex] = 0.842647 mol KNO₃
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
0.842647 mol KNO₃ ≈ 0.843 mol KNO₃
