Answer:
H₂ + Cl₂ → 2HCl
Explanation:
The equation that is balanced and follows the law of conservation of mass is:
H₂ + Cl₂ → 2HCl
Based on the law of conservation of mass "in a chemical reaction, matter is neither created nor destroyed but they combine with one another".
It suggests that the number of species on both sides of the expression must be the same.
For the given reaction:
H₂ + Cl₂ → 2HCl
Reactant side Product side
H 2 2
Cl 2 2
Which of the following is not likely to occur if a city loses its tax base due to economic decline? A. The city will have fewer police and fire fighters. B. City residents will have adequate health care and hospital services. C. The city will have a decline in public housing. D. Public and private buildings will decay.
Answer:
B.
City residents will have adequate health care and hospital services.
Explanation:
the correct answer for edg 2020
Answer:
B
Explanation:
how is oxidation of copper seen on the statue of liberty similar to flammability and how is it different from flammability?
Answer:
Flammability and oxidation of copper are both chemical properties of a substance.Chemical properties are the properties that tells us how a substance can react with others.Flammability, oxidation of copper, rusting of iron, precipitation e.t.c are chemical properties of a substance.Flammability is one important chemical property of hydrocarbons.Oxidation reaction is peculiar to copper.
Explanation:
Where do convection currents occur?
A.
In areas with the same temperature
B.
In areas with different air pressures
C.
In areas with the same altitude
D.
In areas with different cloud types
Answer:
a because where the air travels for example a radiator
Answer:
C.
In areas with the same altitude
Explanation:
For this reaction, C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O, the ∆H is –2200 kJ. If two moles of C3H8(g) reacted with excess oxygen, what would be true?
A) 4400 kj of heat released into surroundings
B) 4400 kj of heat absorbed by system
C) 1100 kJ heat released into surroundings
D) 1100 kJ heat absorbed by system
A) 4400 kj of heat released into surroundings
Further explanationReaction
C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O, the ∆H is –2200 kJ
Reaction exothermic( ∆H=-, released heat to surrounding) and for combustion of 1 mole of C3H8
So for two moles of C3H8, the enthalpy :
[tex]\tt -2200\times 2=-4400~kJ[/tex]
Which metallic crystal structure has a coordination number of 8
Answer:
body-centered cubic
Explanation:
:D
Question 12 of 25
Which sentence describes all atoms of one element?
O A. They have the same number of protons.
OB. They have the same number of neutrons.
O C. They have the same number of isotopes.
D. They have the same properties.
Answer:
D They have the same properties.
Explanation:
The same no. of isotopes doesnot describes because isotopes have same symbol but didderent atomic mass.
An example of a decomposer is a:
rabbit
mushroom
tulip
Answer:
mushroom
Explanation:
Which chemical family below would the element iodine most likely belong to?
The chemical family that the element iodine should belong to is halogen.
The following information related to the halogen is:
It is the subset that has chemical elements i.e. reactive. It is in Group 17 on the periodic table that should be existed in the environment as the compounds instead of the pure elements.The other type of halogens should consist of fluorine (F), chlorine (Cl), etc.Therefore we can conclude that the chemical family that the element iodine should belong to is halogen.
Learn more: brainly.com/question/13145357
Which receptors are responsible for the production of saliva?
Answer:
taste receptor
Explanation:
Good luck :)
The stability and inert nature of noble gases is caused by:
a full d sublevel
a full f sublevel
a full p and a full d sublevel
a full s and a full p sublevel
Answer: a full s and a full p sublevel
Explanation: "noble gases. They are an especially important group of the periodic table because they are almost completely unreactive, due to their completely filled outermost s and p sublevels."
The first atomic structure *
Yes
NO
Answer:
Yes? Sry I’m kinda confused
Explanation:
Sry if I’m wrong
The Bohr model of the atom suggest that the protons and neutrons are found in the nucleus and the electrons orbit the nucleus much line planets around the sun. How is our modern model of the atom different from this model?
Answer:
D) The electrons move around the nucleus in an electron cloud
Explanation:
i just did it on usa test prep !
What is the net force on a car stopped at a stop sign?
can someone help me identify the elements please, i rlly need help
Answer:
1 : any of more than 100 substances that cannot by ordinary chemical means be separated into different substances Gold and carbon are elements. 2 : one of the parts of which something is made up There is an element of risk in surfing. 3 : the simplest principles of a subject of study the elements of arithmetic.
Explanation:
Fill in the coefficients that will balance the following reaction:
PbI4 +
CrCl3 →
PbCl4 +
CrI3
the equation balanced is
3 PbI4 + 4 CrCl3 → 3 PbCl4 + 4 CrI3
Answer:
3,4,3,4
Thank me later!
Explanation:
What is the energy of a photon with a frequency of 3.2 x 10 -2 Hz?
Answer:
E = 21.22 ×10⁻³⁶ J
Explanation:
Given data:
Energy of photon = ?
Frequency of photon = 3.2×10⁻² Hz
Solution:
Formula:
E = hf
h = 6.63×10⁻³⁴ Js
Now we will put the values in formula.
E = 6.63×10⁻³⁴ Js × 3.2×10⁻² Hz
E = 21.22 ×10⁻³⁶ J (Hz= s⁻¹)
Which of the following is not a subatomic particle?
O Electron
O Neutron
O Nucleus
O Proton
The nucleus is not a subatomic particle, but rather made of the subatomic particles of protons and neutrons. An electron is also a subatomic particle, but it is not found in the nucleus. There are many other subatomic particles, but your teacher probably won't go over those terms until later.
A 100g of sample of a compound is combusted in excess oxygen and the products are 2.492g of CO2 and 0.6495 of H2O. Determine the empirical formula of the compound?
The empirical formula : C₁₁O₁₄O₃
Further explanationThe assumption of the compound consists of C, H, and O
mass of C in CO₂ =
[tex]\tt \dfrac{12}{44}\times 2.492=0.680~g[/tex]
mass of H in H₂O =
[tex]\tt \dfrac{2.1}{18}\times 0.6495=0.072~g[/tex]
mass of O :
mass sample-(mass C + mass H)
[tex]\tt 1-(0.68+0.072)=0.248`g[/tex]
mol of C :
[tex]\tt \dfrac{0.68}{12}=0.056[/tex]
mol of H :
[tex]\tt \dfrac{0.072}{1}=0.072[/tex]
mol of O :
[tex]\tt \dfrac{0.248}{16}=0.0155[/tex]
divide by 0.0155(the lowest ratio)
C : H : O ⇒
[tex]\tt \dfrac{0.056}{0.0155}\div \dfrac{0.072}{0.0155}\div \dfrac{0.0155}{0.0155}=3.6\div 4.6\div 1\\\\\dfrac{11}{3}\div \dfrac{14}{3}\div \dfrac{3}{3}=11:14:3[/tex]
Please help this is chemistry.
Answer:
C
Explanation:
the rest are trends except for Electronegativity
How can a mixture be separated?
Answer:
Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.
An exacuted glass vessel weighs 50 g when empty, 148g when filled with an liquid of density o.989/cc and 50.5 g whenfilled with an ideal gas760 mmHg and at 300k. Determine the molecular weights of gss.
MW of gas : 124.12 g/mol
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of density
The unit of density can be expressed in g/cm³ or kg/m³
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
glass vessel wieight = 50 g
glass vessel + liquid = 148 ⇒ liquid = 148 - 50 =98 g
volume of glass vessel :
[tex]\tt V=\dfrac{m}{\rho}=\dfrac{98}{0.989}=99.1~ml[/tex]
An ideal gas :
m = 50.5 - 50 = 0.5 g
P = 760 mmHg = 1 atm
T = 300 K
[tex]\tt PV=\dfrac{mass(m)}{MW}.RT\\\\MW=\dfrac{m.RT}{PV}\\\\Mw=\dfrac{0.5\times 0.082\times 300}{1\times 0.0991}=124.12~g/mol[/tex]
Hi I really need help 7th grade science Water gets soaked up by a paper towel because of the property of blank Adhesion Cohesion Deposition Evaporation
Answer:
Adhesion
Explanation:
Water is soaked up by a paper towel because the forces of adhesion exceeds the forces of cohesion.
The forces of adhesion binds the water molecule to the paper towel while the forces of cohesion binds the water molecules to each other.
Adhesion of water to the walls of the paper exerts an upward force that draws water molecules up the paper.
Hence, the movement of water up a paper towel occurs when the forces of adhesion to the walls of the paper is greater than the forces of cohesion acting between the water molecules.
Which list contains only animal phyla? mosses, annelids, conifers, chordates mosses, ferns, conifers, flowering plants cnidarians, mollusks, annelids, arthropods, echinoderms, chordates cnidarians, ferns, annelids, arthropods, echinoderms, flowering plants
Answer:
cnidarians, mollusks, annelids, arthropods,
Explanation:
Living organisms have been grouped using a system of classification that runs from Kingdom to Species. One of those kingdoms is KINGDOM ANIMALIA, which consists of animal species i.e. organisms that are strictly heterotrophic and eukaryotic.
The next taxa after kingdom is PHYLA. According to this question, the phyla which consists of only animals are cnidarians, mollusks, annelids, arthropods. Other options contain ferns, mosses, and flowering plants which belong to Kingdom Plantae.
Answer:
on edge its C
Explanation:
Explore the Build an Atom simulation. Identify one interesting function, quality, or graphic in the simulation.
Answer:
- Adding protons changes the identity of the atom, adding one moves from the right to left on the Periodic Table.
A_________is the distance from one compression to the next compression in a longitudinal wave. (Page 2 Vocabulary)
A.frequency
B.rarefaction
C.amplification
D.wavelength
Answer:
wavelength
Explanation:
Help please! Tell me which one goes where.
Answer:
human-F
chicken-D
rabbit-E
tortoise-C
salamander-B
fish-A
Explanation:
hope this helped!!
I tried my best!!
please mark me as brainliest
HAVE A GREAT DAY <3
Answer:
D Tortoise
B Salamander
A Fish
C Chicken
F Human
E Rabbits
Explanation:
I Really have an Explanation
Imagine you're cooking dinner for a few of your friends. You decide to make a salad with homemade dressing. Why do you need to think about the polarity of the different ingredients in your salad dressing in order for it to turn out well? Answer in 1 to 2 paragraphs. (10 points) Think about how polar molecules only mix with other polar molecules and nonpolar molecules only mix with other nonpolar molecules.
Answer:15
Explanation:
What is the specific heat of a substance that absorbs 2500 joules of heat when a sample of 100g of the substance increases in temperature from 10.°C to 70.°
Answer:
0.417 J/gºC
Explanation:
From the question given above, the following data were obtained:
Heat (Q) absorbed = 2500 J
Mass (M) of substance = 100 g
Initial temperature (T1) = 10 °C
Final temperature (T2) = 70 °C
Specific heat capacity (C) =?
Next, we shall determine the change in temperature (ΔT). This can be obtained as follow:
Initial temperature (T1) = 10 °C
Final temperature (T2) = 70 °C
Change in temperature (ΔT) =?
Change in temperature (ΔT) = T2 – T1
Change in temperature (ΔT) = 70 – 10
Change in temperature (ΔT) = 60 °C
Finally, we shall determine the specific heat capacity of the substance as follow:
Heat (Q) absorbed = 2500 J
Mass (M) of substance = 100 g
Change in temperature (ΔT) = 60 °C
Specific heat capacity (C) =?
Q = MCΔT
2500 = 100 × C × 60
2500 = 6000 × C
Divide both side by 6000
C = 2500 / 6000
C = 0.417 J/gºC
Therefore, the specific heat capacity of substance is 0.417 J/gºC
HELP ME PLSSSS
Which *TWO* statements explain ways in which cells get nutrients
A. The nucleus provides the instructions for making proteins from amino acids.
B. Mitochondria change energy stored in organic compounds into a usable form
C. Transport proteins help molecules cross cell membranes.
D. A chloroplast converts energy from sunlight into organic matter
Answer:
i am not sure but
Explanation:
b and c should be correct
Answer:b and D
Explanation:
is silver tarnishing a physical change or a chemical change?
Answer:
chemical
Explanation:
Some bronze objects tarnish to a dark brown color. Chemical properties can be identified by the changes they produce. The change of one substance into another substance is called a A piece of wood burning, an iron fence rusting, and a silver spoon tarnishing are all examples of chemical changes.