Answer:
20ºCelsius
Explanation:
symbols used in equations, together with the explanations of the symbols, are shown below. which set is correct?
1. (g), grams
2. (l), liters
3. (aq), dissolved in water
4. (s), solid product
someone please explain this to me, all of these answers seem correct to me!
The set of explanations that has the correct representation for the chemical equation are aq and g. Thus the correct options are 3 and 4.
The chemical equation has been written with the symbols of the product and the reactant. The chemical equation has the moles of an element that has been reacted. The moles have written prior to the compound as the coefficient.
The compounds state has also been present in the chemical equation. The compounds in the reaction can be present as:
solidliquid dissolved in watergaseous stateThe symbol has been added to the compound to depict the state of the compound in the chemical reaction. The symbols used for the following states are:
s = solidl = liquid aq = dissolved in waterg = gaseous stateThe set of explanations that has the correct representation for the chemical equation are aq and g. Thus the correct options are 3 and 4.
For more information about the chemical equations, refer to the link:
https://brainly.com/question/21049751
Calculate the volume occupied by 2.00 moles of H₂ at 300.0 K and 1.25 atm
Answer:
V = 39.38 L
Explanation:
Given that,
No. of moles of H₂, n = 2
Temperature, T = 300 K
Pressure, P = 1.25 atm
We need to find the volume occupied by the gas. We can use the ideal gas law to find it such that,
[tex]PV=nRT[/tex]
Where
R is gas constant, R = 0.08205 L-atm/mol-K
V is volume of the gas
Rearranging the above formula for V. So,
[tex]V=\dfrac{nRT}{P}\\\\V=\dfrac{2\times 0.08205\times 300}{1.25}\\\\V=39.38\ L[/tex]
So, the volume occupied by the gas is 39.38 L.
In a 0.100M solution of a weak polyprotic acid what is the equilibrium concentration of A-2?
H2A+H20-H30+A-2
Ka1=7.5x10^-5
Ka2=6.2x10^-8
answer= ?x10^?
A carrot was cut into many pieces, and moved into a freezer what change is it
Answer:
Physical change
Explanation:
Cutting and freezing are both examples of physical changes that do not alter the chemical composition or properties of the object/substance.
Answer:
physical change
Explanation:
carrot lost its original shape
More potential  energy can be stored by moving against the magnetic force of a stronger magnet
In a covalent bond:
A. None of these.
B. One atom accepts electrons from another.
C. The atoms attract each other but their electrons do not interact.
D. Both atoms share their electrons.
Answer:
D. Both atoms share their electrons.
Explanation:
Consider 2 pots of water. Each pot has the same diameter, but pot A is deeper than pot B and so there is more water in pot A. If both pots are exposed to the same amount of heat for 5 minutes, which pot will contain the hottest water after 5 minutes? Why?
Answer:
POT B
Explanation:
Because Pot B contains lesser amount of water, it is going to have the hottest water compared to pot A.
Since the amount of heat is constant, in pot B less water molecules would share the heat, compared to pot A where a larger amount of water would have to share the heat.
Find the molar mass of PCI3
Answer: around 137.33
Explanation:
If 154.9 grams of KOH exactly neutralizes 262 mL of an aqueous HCl solution, what is the concentration of the HCl solution ?
Answer:
10.54 M
Explanation:
First you multiply 154.9 by 262 to get the mols and then you divide that number by 3850.45540796906 L and you get 10.54 M.
Help me please. I need to find the name of the oxides of the elements (N2O, SO3, Li2O, CO2, Al2O3, Cl2O, SO2, CrO3, MgO, CI2O5, K2O, BaO)
Answer:
Nitrous oxide,Sulfur trioxide, Lithium oxide, Lithium oxide,Aluminium oxide, Dichlorine monoxide, Sulfur dioxide, Chromium trioxide, Magnesium oxide,Dichlorine Pentoxide, Potassium oxide, Barium oxide
Explanation:
What's the correct name for Pt3N5
Answer:Phosphate
Explanation:It is called phosphate because of this higher state (otherwise it would be called phosphite and be PO3+3 ).
Which of the following is an example of a learned response?
A.
A bird avoids moths that make it sick after eating one.
B.
A person's leg moves when a doctor taps his or her leg with a mallet.
C.
A plant turns to follow the sun during the day.
D.
An adult salmon is able to return to the river where it hatched.
The Second Law of Thermodynamics states that the overall entropy of the universe (or any other isolated
system) can never decrease. Identify the systems to which the Second Law of Thermodynamics would
apply
a reaction vessel that is completely sealed and insulated
an open beaker containing an aqueous solution
a sealed glass flask that is not insulated
the Earth
Answer:
apply
does not
does not
does not
Explanation:
The Second Law of Thermodynamics is applicable to only a reaction vessel that is completely sealed and insulated as the entropy remains constant during such chemical change.
What is a chemical change?
Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
Learn more about chemical change,here:
https://brainly.com/question/23693316
#SPJ2
Describe how the particles are arranged in a solid, liquid, and gas.
Answer:
Particles in a: gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
Explanation:
In an experiment between 26.4 grams of Mg and O,, Mgo is produced. The percent
yield was 90%. Determine the actual yield of magnesium oxide.
Answer:
39.6 g
Explanation:
The equation of the reaction is;
2Mg(s) + O2(g) --------> 2MgO(s)
To obtain the limiting reactant;
Number of moles in 26.4 g of Mg = 26.4g/24 g/mol = 1.1 moles
If 2 moles of Mg yields 2 moles of MgO
1.1 moles of Mg yields 1.1 * 2/2 = 1.1 moles of MgO
Number of moles in 26.4 g of O2 = 26.4 g/32g/mol = 0.825 moles
If 1 mole of O2 yields 2 moles of MgO
0.825 moles of O2 yields 0.825 moles * 2/1 = 1.65 moles of MgO
Hence Mg is the limiting reactant.
Theoretical yield of MgO = 1.1 moles of MgO * 40 g/mol = 44 g
Percent yield = 90%
Percent yield = actual yield/theoretical yield * 100
Actual yield = Percent yield * theoretical yield/100
Actual yield = 90 * 44/100
Actual yield = 39.6 g
A reaction was suppose to produce 20 L of gas. Only 12 litters of gas were produced in the lab. What is the percent yield for this reaction?
Answer:
[tex]\boxed {\boxed {\sf 60 \%}}[/tex]
Explanation:
Percent yield is a ratio of the actual yield to the theoretical yield. It is found using this formula:
[tex]\% \ yield= \frac {actual \ yield}{theoretical \ yield} *100[/tex]
The actual yield is 12 liters, because that was actually produced in the lab.
The theoretical yield is 20 liters, because that was the expected yield.
[tex]\% \ yield= \frac {12 \ L}{20\ L} *100[/tex]
[tex]\% \ yield= 0.6*100[/tex]
[tex]\% \ yield= 60[/tex]
For this reaction, the percent yield is 60%.
Petrol used in cars is obtained by refining ?
Answer:
Crude oil is refined to make petrol (in America this is known as gasoline) or diesel. Most forms of transport use either petrol or diesel to power their engines - from lawnmowers, cars, buses and motorbikes to large ships and aeroplanes.
what part of the brain helps us process sounds?
Answer:
Temporal lobes
Explanation: They are right above the ears...And they help us process sounds...They are also important for learning and memory, as well as the understanding of language
Which of the following correctly shows the bond polarity?
please help me asap!
c. H-I>Se-N>Cl-F
that is the answer i think...
What does an organism's phenotype describe?
Answer:
The term "phenotype" refers to the observable physical properties of an organism; these include the organism's appearance, development, and behavior
An organism's phenotype describe appearance, development, behavior, maybe even levels of hormones or blood cells.
How many moles of gas are in a 30 liter compressed air tank if the
temperature of the tank is 300K and the pressure is 200 atmospheres? *
Answer:
B
Explanation:
What's the force of a pitching machine on a baseball baseballs pitched by a machine
Answer:
CAN U HELP ME
Explanation:
PLS
True or false: Breaking down water into the elements hydrogen and oxygen is an example of a chemical change.
Answer:
True.
Explanation:
When water is decomposed into hydrogen and oxygen, chemical bonds are broken, chemical energy is released, and two new substances are formed from one.
Help! 7th Grade Math!
A triple beam balance measures the ______ of an object in ______.
A
mass, grams
B
volume, liters
C
temperature, Fahrenheit
D
length, meters
Answer:
D
Explanation: Trust me
The triple beam balance measures the mass of an object in grams.
Explanation:
A triple beam balance is an instrument used in labs to measure the mass of a substance or an object.It measures the mass in units of grams.It consists of three beams with a different set of increments in grams. which are:Middle beam = Increments of 100 grams
Front beam = Increments from 0 grams to 10 grams
Farther beam = Increments of 10 grams
So, from this, we can conclude that the triple beam balance measures the mass of an object in grams. Hence the correct answer is option A.
Learn more about triple beam balance here:
https://brainly.com/question/12149442
PLZ HELP
In this activity, you’ll conduct research about the savanna biome, a type of grassland. Use credible websites to gather information on these points:
the location of the savanna on Earth
the conditions in the savanna (temperature, precipitation, etc.)
the living things that make up this ecosystem (Identify all forms: plants, prey animals, and predators, for example.)
the nonliving components that make up the environment
After you’ve completed your research, answer the following questions.
Part A
Summarize your research, and describe the attributes of the savanna.
Answer:
Savannas are grasslands found in Africa, Australia, South America, and India. The climate is warm or hot. Savannas experience both dry and rainy seasons. Each year, savannas receive about 20 to 50 inches of rain in a span of six to eight months. The other months are dryer. There’s also a threat of wildfires because of the severe dryness during these months. Grasslands are true to their name because their vegetation is mostly grass. Savannas are home to a wide range of animals, including different species of beetles and insects, which many creatures consume. Squirrels, mice, elephants, gazelles, and antelopes are the plant-eating animals that live in the savanna. Hyenas, lions, and leopards are some of the meat-eating animals in these areas. Some of the nonliving components of the system include very porous soil that allows water to drain easily.
Explanation:
this is the edmentum answer :)
define adhesion and give an example?
Similar to Cohesion, adhesion is the attraction between molecules of different substances . Water uses adhesion when it's attraction to another substance is greater than the water's attraction to itself. if you have ever dropped a cup of water on a hardwood floor,you know that it spreads out instead of foaming beads.
why does iron have two kinds of valence number?
Answer:
The electronic configuration of iron is: Ar3d64s2. the two electrons in the 4s orbital are paired, and two of the electrons in the 3d orbitals are paired leaving four unpaired electrons. In general when you are populating the p, d, f, etc
Explanation:
hope dis help
Which industry would most likely be affected if coal recourses were depleted.
1.Power production
2.Transportation
3.construction
Temperature is a measure of ____ of the particles in an object.
Answer:
Temperature is a measure of "average kinetic energy" of the particles in an object
Carol views a specimen under the microscope and notices that it has no nucleus. What
must she be looking at?
A. Animal cell
B. Plant cell
C. Bacteria
D. Protist
Answer:
Bacteria
Explanation: