Answers
Answer:
c. h represents the total energy in a reaction
Answer:
B. It represents the heat involved in a reaction
Explanation:
It would make sense since most of the time h in chemistry
is the equivalent to heat.
I hope this helped you!
Related Questions
SOMEONE HELP ME PLEASE ILL GIVE BRAINLY
Vinegar and baking soda fizzing is a
Change in temperature
Formation of gas/bubbles
Formation of precipitate
Release of energy (fire/light)
Change in color
Answers
Answer:
When you combine the solid (baking soda) and the liquid (vinegar), the chemical reaction creates a gas called carbon dioxide. Carbon dioxide is invisible, except as the bubbles of gas you may have noticed when the vinegar and baking soda mixture began to fizz.
Explanation:
What phase is Nitrogen at 80K
Answers
Answer:
i believe its gas sorry if i am wrong
Explanation:
Na2NO₃ → Na2 NO2 + O2
Answers
Answer:
4NO2 + 2Na2O + O2 → 4NaNO3
For the most effective hot pack, should the Temperature change be positive or negative ?
Answers
Answer:
Positive
Explanation:
For the most effective hot pack, the temperature change should be positive.
Hot packs are generally utilized for their heat-producing abilities. Hence, the reactions leading to the activation of hot packs are usually exothermic, that is, heat energy generating. In other words, positive or increased temperatures must be generated when hot packs are activated.
This is unlike cold packs which are utilized for the cold-generating abilities. Reactions leading to their activations must be endothermic, that is, heat-absorbing.
What do scientists use to describe a constellation? A.It’s boundary B. It’s brightest star C. It’s star pattern D. It’s story in Greek mythology
Answers
Answer:C
Explanation:
Because they use it so that they can find more information about it.
What scientists use to describe a constellation: C. It’s star pattern
A star is a giant astronomical or celestial object that comprises a luminous sphere of plasma and bounded together by its own gravitational force.
Generally, a star is typically made up of two (2) main hot gas and these are Hydrogen (H) and Helium (He). Some examples of a star are;
Antares. Canopus. Betelgeus. Sun (closest to planet Earth). Vega.A galaxy can be defined as a collection (group) of many billions of stars, which are existing independently. Thus, the greatest number of stars are found in a galaxy.
A constellation can be defined as a collection (group) of visible stars forming a recognizable or perceived pattern in the sky. Also, this pattern or outline is sometimes attributed by scientists to a mythological figure.
In conclusion, scientists use the pattern of a star to describe a constellation.
Find more information: https://brainly.com/question/17934476
at what points does the object accelerate please explain
Answers
Answer:
M=3
B=25
Equation= 3x+25
Explanation:
M is your slope and if you follow the slope- intercept formula (y=m+b) you just need to plug in the numbers.
Thus your answer:
M=3
B=25
Equation= 3x+25
Jen wants to make a fair comparison of the reactivity if the metals with hydrochloric acid. What are the 2 variables that must be kept constant?
Answers
Answer:
the concentration of hydrochloric acid
the temperature in heating
Which of the following is a true statement?
А
Periods form horizontal rows; groups form vertical columns
B Groups form horizontal rows; periods form vertical
C Categories form horizontal rows; gases form vertical
D
Gases form horizontal rows; categories form vertical
columns
Answers
Answer:
A
Explanation:
learned this in biology
Potassium and calcium are rarely found as pure elements in nature. They are usually combined with other substances. Explain why is this so.
Answers
Potassium and calcium are rarely found as pure elements in nature but are usually combined with other substances because of their high reactivity.
Reactivity of ElementsReactivity of elements refers to the ability of atoms of elements to gain or lose electrons in order to form bonds with other elements.
The most reactive elements are those of group 1, 2 and 7.
Group 1 elements are known as alkali metals and easily lose their one valence electrons to form ions.Because of their reactivity, they do not occur free in nature but in combined forma with other elements. Example is potassium.
Group 2 elements are known as the alkaline earth metals.They are very reactive as well and lose their two valence electrons easily to forms ions. Because of their reactivity, they do not occur free in nature but in combined forma with other elements. Example is calcium.
Therefore, potassium and calcium are rarely found as pure elements in nature but are usually combined with other substances because of their high reactivity.
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Which of the following changes to gas particles in a box WILL NOT increase the pressure?
a. Adding more gas molecules
b. Raising the temperature
c. Increasing the volume of the container
Answers
Answer:
. Increasing the volume of the container
Explanation:
Oh really
How do I look evil, right? Egypt made me brown
Answers
Answer:
ummmmmmmmmmmmmmmmmmmmmmmm
Answer:
????????????
Explanation:
ummmmmmmmm
two products of the recharge process are calcium and magnesium chloride. Based on your knowledge of bonding and oxidation states (not based solely on the article), what are the chemical formulas for the products of the recharge process? Report you answer with the most likely oxidation state.
Answers
Answer: The chemical formulas of calcium and magnesium chloride are [tex]CaCl_2[/tex] and [tex]MgCl_2[/tex]
Explanation:
A chemical formula is the representation of a substance in terms of chemical symbols showing the elements present in a compound and their relative proportion.
Calcium is having an atomic number of 20 has electronic configuration of [tex]1s^22s^22p^63s^23p^64s^2[/tex]. It can lose two electrons to have an oxidation state of +2.
Magnesium is having an atomic number of 12 has electronic configuration of [tex]1s^22s^22p^63s^2[/tex]. It can lose two electrons to have an oxidation state of +2.
Chlorine is having an atomic number of 17 has electronic configuration of [tex]1s^22s^22p^63s^23p^5[/tex]. It can gain one electron to have an oxidation state of -1.
Thus the chemical formulas of calcium and magnesium chloride are [tex]CaCl_2[/tex] and [tex]MgCl_2[/tex]
What is the atomic number of Sulfur atom
Answers
Answer:
16
Explanation:
hope you like the answer
Can someone tell me the answer and explanation plz
Answers
MATCH the sub-atomic particles with their descriptions.
Neutron
Electron
Quark
Proton
A. Smallest theoretical particles of protons and neutrons
B. + charge; located in the nucleus
C. no charge; located in the nucleus
D. - charge; located outside the nucleus
Answers
Explanation:
Neutron - no charge, located in the nucleus.
electron - - charge, located outside the nucleus.
Quark- smallest theoretical particles of protons and neutrons.
proton- + charge, located in the nucleus.
(ii) Electrons are supplied to the external circuit. How and where is this done?
[2]
Answers
Answer:
The electrons are supplied by the species getting oxidized. They move from anode to the cathode in the external circuit. The external battery supplies the electrons. They enter through the cathode and come out through the anode
The electrons are supplied by the species getting oxidized. They move from the anode to the cathode in the external circuit.
What are electrons?An electron is a negatively charged subatomic particle.
The reaction at the anode is oxidation and that at the cathode is reduction. Here, the anode is positive and the cathode is the negative electrode. The reaction at the anode is oxidation and that at the cathode is reduction.
The electrons are supplied by the species getting oxidized. They move from the anode to the cathode in the external circuit. The external battery supplies the electrons. They enter through the cathode and come out through the anode.
Learn more about electrons here:
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#SPJ2
Use the drop-down menus to complete the sentences describing what happens when the temperature of a fluid increases. The kinetic energy of the molecules . The speed of the molecules . The density of the fluid . The fluid
Answers
Answer:
The kinetic energy of the molecules
increases
.
The speed of the molecules
increases
.
The density of the fluid
decreases
.
The fluid
rises
.
Explanation:
this is correct on edge
When the temperature of a fluid increases, then the kinetic energy of the molecules INCREASES, the speed of the molecules INCREASES, the density of the fluid DECREASES, and the fluid RISES.
Kinetic energy can be defined as motion energy, whereas potential energy is energy stored to be used when required.In a given object, as kinetic energy increases, the motion of the molecules also increases.An increase in kinetic energy (and temperature) in a fluid leads to the separation of its constituent particles, thereby decreasing the density.In conclusion, when the temperature of a fluid increases, then the kinetic energy of the molecules INCREASES, the speed of the molecules INCREASES, the density of the fluid DECREASES, and the fluid RISES.
Learn more about kinetic energy here:
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How many hydrogen atoms are on the Reactants side?
Answers
Answer:
two hydrogen atoms
In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. If we count the number of hydrogen atoms in the reactants and products, we find two hydrogen atoms.
Can i get brainlisted please
Answer:
two hydrogen atoms.
Explanation:
the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. If we count the number of hydrogen atoms in the reactants and products, we find two hydrogen atoms.
hope it helps : )
A __________ has distinct properties and composition that never vary.
A) solution
B) molecule
C) pure substance
D) heterogeneous mixture
Answers
C) pure substance
Help please?? I’m confused
Answers
20 POINTS 7th garde science
Answers
Answer:
a
Explanation:
because look at the pic of the flower
Answer:
a
Explanation:
Which molecule will provide the greatest amount of energy to a living cell
(1) water
(2) oxygen
(4) carbon dioxide
organic compounds in nood
(3) sugar
Answers
Answer: oxygen
Explanation: because we need it to live ;)
Answer:
(2) oxygen
Explanation:
If a 750.0 gram sample of water is cooled for 95.0 oC to 17 oC, how much heat is released? CP = 4.18 J/g oC
Answers
Answer:
Heat, Q = 262 kJ
Explanation:
Given that,
Mass of a sample, m = 750 g
Initial temperature, [tex]T_i=95^0\ C[/tex]
Final temperature, [tex]T_f=17^0\ C[/tex]
The specific heat of the sample, [tex]c=4.18\ J/g^0 C[/tex]
We need to find the amount of heat released. The amount of heat released is given by the formula as follows :
[tex]Q=mc\Delta T\\\\Q=750\times 4.48\times (17-95)\\\\Q=-262080\ J\\\\Q=-262\ kJ[/tex]
So, 262 kJ of heat is released by the sample.
what are drawn as arrows that are used to show both
size and direction.
Answers
The depictions of ionic compounds do not show distinct compound units but rather a collection of ions in the ratio given by the formula. Explain how the drawing of NaCl both illustrates that the compound exists as a large collection of ions and that the ratio of sodium ions to chloride ions is 1-to-1 as indicated by the formula NaCl.
Answers
Answer:
The ionic compound NaCl has a Face Centered Cubic unit cell
The site for atoms are Face, center and Edges corner.
Effective number of atoms
Na+
1centers + 12edges x[tex]\frac{1}{4}[/tex] = 4 Na+
Cl-
6face x[tex]\frac{1}{2}[/tex] + [tex]\frac{1}{8}[/tex] x8 corners = 4Cl-
This is just one unit cell effective atom, there are thousand's of such unit cells are combined to form one such structure of NaCl. The real formula of NaCl is Na4Cl4 but for simplicity we use empirical formula that is NaCl.
i need help so what would you do if you have a boyfriend that lives an hour and 8 minutes away from you and its been almost 3 months and you love him but it hurts that you cant see him, then a guy you liked for over a year told you he likes you back and would give you the relationship you've always wanted in person....who would you pick
Answers
Explanation:
If you really loved the first person you wouldn’t hesitate to chose them over the other:). But you did so that means you didn’t actually loved the other:).
Answer:
Probably the one you are already dating...
Explanation:
...but if you really like the other guy then you should chose him.
Match each organ with the correct organ system.
1. small intestine
skeletal system
2. blood vessels
cardiovascular system
3. lungs
respiratory system
4. tricep
digestive system
5. spine
muscular system
Answers
Answer:
1. small intestine: digestive system
2. blood vessels: cardiovascular system
3. lungs: respiratory system
4. tricep: muscular system
5. spine: skeletal system
Answer:
1. small intestine: digestive system
2. blood vessels: cardiovascular system
3. lungs: respiratory system
4. tricep: muscular system
5. spine: skeletal system
Explanation:
What is an inference?
A prediction of test results before an experiment
A retest of experimental results to make them reliable
Background research completed with questioning
A conclusion derived from evidence and logical reasoning
Answers
Hi Jose, when you submit this form, the owner will be able to see your name and email address.
1. A 100. g samle of water absorbs how many Joules of energy as its temperature is changed from
35.0 C to 60.0 C. (water s = 4.184 J/g C)
Answers
Answer:
10460J
Explanation:
Given parameters:
Mass of water sample = 100g
Initial temperature = 35°C
Final temperature = 60°C
Unknown:
Amount of energy absorbed by water = ?
Solution:
The amount of energy absorbed by water is mathematically expressed below;
H = m C ΔT
H is the amount of energy
m is the mass
C is the specific heat capacity of water = 4.184J/g°C
ΔT = 60°C - 35°C = 25°C
Now insert the parameters and solve;
H = 100 x 4.184 x 25 = 10460J
After the completion of a gas forming reaction, the column of water remaining in the collection flask was measured to me 55mm high, the vapor pressure of water is 0.0313atm at 25oC, and the atmospheric pressure that day was measured as 0.950 atm, what is the partial pressure of the gas produced by the reaction? 1mmHg=13.595mm H2O and 1atm=760mmHg (see sample calculation found in prelab slides.)
Answers
Answer:
Partial pressure of gas = 0.913 mmHg
Explanation:
Since the column of water in the tube is higher than in the container, it means that the atmospheric pressure is greater than the gas pressure.
Also, since the gas is collected over water, the total gas pressure is due to partial pressure of the gas and the partial pressure of water vapor, i.e.,
Hence, Partial pressure of gas = Patm - Pressure due to height of water column - Partial pressure of water
Pressure due to height of water column = 55 mmH₂O
Since 13.595 mmH₂O = 1 mmHg
55 mmH₂O = 55/13.595 mmHg
Converting to 55/13.595 mmHg to atm
Pressure due to height of water column = (55/13.595 mmHg) * (1 atm/760 mmHg) = 0.00532
Partial pressure of gas = (0.950 - 0.00532 - 0.0313) atm
Partial pressure of gas = 0.913 mmHg
