Answer:
The empirical formula for propane is C3H8.
Answer:
Because propane is made up of only hydrogen and carbon _ the chemical formula is C3H8..
Hey u are loved!!!! Remember that don’t give up
Answer:
thank you :')
Explanation:
Answer:
Aw and thank you!
Explanation:
Even though you said I am loved, you are loved very much too! Don't you ever forget that! No matter what happens and how you feel remember that you are loved and mean so much to people. What you said to me means a lot to me! Thank you! YOU ARE LOVED!!
Wass, volume and density are all properties of
matter
3
weight.
formula
Answer:
:)
Explanation:
They are all properties of Matter. weight and formula wouldn't make sense.
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:
this is my other account btw and i just wanna thank you so much i don't want to fell this semester and now ima mark you brainliest thank you so so so much
Explanation:
While washing his hands before the client consultation with Chloe, Jayden dripped some water onto the countertop. When he came back later to wipe it up, it had evaporated. What happened to the drops of water?
The water underwent a chemical change.
The water underwent a physical change.
The water became an organic substance.
The water became a pure substance.
Answer:
the water underwent a physical change. This is because the water simply changed states, and could become liquid again, but it will remain H20 throughout the time
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
Turning _______ a switch completes the circuit.
Answer:
the blank is on.
Turning on a switch completes a circuit.
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.
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 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.
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
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]
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
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?
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
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:
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:
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:
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.
Can anything change solutions? Be
specific!
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
Gas giants all have rings around them.
true
or
false
I need answers now! please.
Answer:
Some particles of gas and dust that the planets are made of were too far away from the core of the planet and could not be squashed together by gravity. They remained behind to form the ring system
Explanation:
so in simplier terms yes lol
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:
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
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.
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.
Need Help Solving It.
17. Calculate the percent composition of B2Br6
Answer:
%composition of B₂ = 4.3%
%composition of Br₆ = 95.7%
Explanation:
Given data:
Percent composition of B₂Br₆ = ?
Solution:
Total mass of B₂Br₆ = 10.8×2 + 79.9×6 = 501 g/mol
%composition of B₂ = ( 21.6 g/ 501 g ) × 100
%composition of B₂ = 0.043 × 100
%composition of B₂ = 4.3%
%composition of Br₆ = ( 479.4 g/ 501 g ) × 100
%composition of Br₆ = 0.957 × 100
%composition of Br₆ = 95.7%
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
Determine whether or not each molecule is a carbohydrate. If it is, classify it as a monosaccharide, a disaccharide, or a trisaccharide.
Answer:
See explanation
Explanation:
Among all the options listed, only compound (c) is a carbohydrate and it is a trisaccharide.
Carbohydrates are represented by the formula (CH2O)n, the subscript n denotes the number of carbon atoms in the carbohydrate. Carbohydrates contains carbon, hydrogen and oxygen in the ratio of 1:2:1.
Carbohydrates can have linear structures and cyclic structures. The cyclic structure as in (c) is mostly obtained in solution. All carbohydrates are six carbon sugars linked together at a certain point as in structure (c).
