E. Mark each description as an exothermic or endothermic reaction. (2 points)
Description
Exothermic
Endothermic
A + heat → B
1
-ΔΗ
Energy diagram:
I
Energy of reactants
greater than energy of
products
Answers
Answer:
1. Endothermic
2. Exothermic
3. Exothermic
4. Endothermic
Explanation:
A P E X
Related Questions
Na+ and P-3 whats the formula and whats the name of it
Answers
Answer:
Sodium phosphide is the inorganic compound with the formula Na 3 P. It is a black solid. It is often described as Na + salt of the P 3− anion. Na 3 P is a source of the highly reactive phosphide anion.
Explanation:
Choose one food chain in the web. Name all of the organisms in that chain. Start with a producer and end with the top level consumer.
Answers
Answer:
Sun
↓
Alfalfa
↓
Rabbit
↓
Coyote
Explanation:
To find - Choose one food chain in the web. Name all of the organisms in that chain. Start with a producer and end with the top level consumer.
Solution -
We know that,
A food chain is a series of events in which one organism eats another and obtains energy.
The Food chain is as follows :
Sun
↓
Alfalfa
↓
Rabbit
↓
Coyote
Identify Acid-base and conjugate acid-base pair in the following: HCOOH + H20 --> HCOO + H3O+ *
Answers
Explanation:
HCOOH (aq) + H2O (l) ⇋ HCOO- (aq) + H3O+ (aq)
acid 1 base 2 base 1 acid 2
About how much evaporation in the water cycle occurs over the ocean?
10 percent
40 percent
86 percent
100 percent
Answers
Answer:c
Explanation:
why does styrofoam fall slower than a rock
Answers
Answer:
The foam board has a larger gravitational force but it also has a very large air resistance force. The net (total) force on the foam board will give it a smaller acceleration than paper.
Explanation:
The air molecules get knocked away and take some of the kinetic energy away from the object, which makes the object slow down
True or False? In the quantum model of the atom, with its s, p & d orbitals, these circles represent the paths on which the electrons travel as they go around the nucleus
Please i am being timed please help
Answers
The melting point of the sample is
Question 5 options:
a)
-60 ºC
b)
60 ºC
c)
-100 ºC
d)
100 ºC
Answers
Answer:
c) -100°C
Explanation:
teeter= 273-k
teeter=273-(-100)
teeter= 373
Define ,'Toxic'.
Ty!!
Answers
Answer:
Toxic is a harmful chemical substances which degrades the quality of pure substance .
Please help this is due soon
Answers
How can we use patterns on the periodic table to predict an element’s structure and reactivity?
Answers
Answer:
The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.
2. What harmful change/s is/are brought about when a metal reacts or mixes with acids
Answers
Answer: hydrogen gas
When metal reacts with acids it produces metal salt and hydrogen gas ( H2 ) . All metals do not react with acids to evolve hydrogen gas . Only those metals react which is more reactive than hydrogen . When metal reacts with acid it forms a salt which is basic in nature and releases hydrogen gas.
Explanation:
Answer:
When metals react with other substances, the gradual wearing away or corrosion of a metal results.This may lead to deterioration of metals
Turtles are cold blooded, meaning they use the Sun to keep warm. A student hypothesizes that his pet turtle will prefer swimming in warm water. He places his turtle on a rock in the middle of the bathtub, and measures how much time the turtle spends off of the rock during a five minute period. He conducts the experiment under four conditions in the bathtub: no water, warm water, cool water , and room temperature water. In this experiment, which is the control group ?
Answers
Answer:
Room temperature water
Explanation:
Neither the amount of water nor the temperature of the water has been changed.
What is DNA. in your own words
Answers
Answer: Molecule that stores genetic information in all organisms.
Explanation:
What do you think could happen with methane gas and CO 2
Answers
Answer:
these gases accumulate in the atmosphere and create the heat-reflective layer that keeps the Earth at a livable temperature. These gases form the insulation that keeps the planet warm enough to support life
To balance the reaction what coefficients (numbers) are needed: HBr +KOH ---> KBr + H2O
Answers
Answer:
H2Br + 2KOH ----- K2Br + 2H2O
A ball rolling down a hill will:
keep rolling forever
roll until stopped by a force
gain potential energy
Answers
Because an object in motion will stay in motion unless acted upon by an outside force
How can wind be used as a source of power?
A
Wind can make the production of fossil fuels faster.
B
The motion of the wind can turn wind turbines.
Deforestation leaves more room for wind to blow.
D
Drilling in the Earth can provide new sources of wind.
Answers
Answer:
Drilling in the earth can provide new sources of wind
Explanation:
A change in which property of light will have no effect on whether or not the photoelectric effect occurs?
frequency
energy
intensity
wavelength
Answers
Answer:
intensity
Explanation:
Intensity has no affect on whether or not the photoelectric effect occurs. The determining property is frequency and since frequency and wavelength are inversely proportional, wavelength matters as well
Answer:
intensty im taking it on edge
Explanation:
plz help me get this right and no links
Answers
Answer:
Outer planets are significantly colder than other planets! The answer is B.
Explanation:
The main difference between inner and outer planets is that inner planets have a high temperature compared to outer planets.
The ____ are a windless zone.
Answers
Answer:
sorry I don't know I just came for points
Explanation:
Mg (s) + 2 HCl (aq) --> MgCl2 (aq) + H2 (g)
Use the equation above to determine the number of grams of magnesium chloride, MgCl2 , that can be produced if 4.00 moles of HCl (hydrochloric acid) react. please show all work and record your answer with proper units and significant figures.
Pls help
Answers
Answer:
m = 190. g MgCl2
Explanation:
Use a molar ratio to get the # of moles MgCl2 produced from 4.00 mol of HCl:
4.00 mol HCl × (1 mol MgCl2/2 mol HCl) = 2.00 mil MgCl2
So 2.00 moles of MgCl2 will be produced. To find the mass in grams, use the molar mass of MgCl2:
2.00 mol MgCl2 × (95.211 g MgCl2/1 mol MgCl2)
= 190. g MgCl2
How do the electron configurations for chlorine explain the steps pls
Answers
Answer:
follow the steps
Explanation:
First make a circle and write 17p and 18n below 17 p.Now again make another circle bigger than previous one and make two small circle .Again make another bigger circle and fill it with 8 small circles .Again make another bigger circle than previous ones and make 7 small circles in it .Now write e in small circles .Then write
Chlorine
Atomic number=17
Atomic weight =35
Shell k l m n
no.of e .2 1 × ×
A fully inflated hot air balloon has a volume of 1,840,000 liters at 100˚C. What approximate volume will the balloon have at 50˚C?
Answers
Answer:
920,000 liters
Explanation:
i divided by 2
help me get it right but don't send links
Answers
Balance the following chemical reaction:
NaF +
Br₂
NaBr +
F2
O A. 3,1,2,1
OB. 1,2,3,4
OC. 2,1,2,1
O D. 1,2,1,2
Answers
Answer:
what the freak is thisnenejehey
How many liters of water would you need to add to 4.36 moles of NaCl to create a 4 M solution?
Answers
Explanation:
1 M = 1 mol/L
4.36 mol NaCl ×(1L H20 / 4 mol NaCl) = 1.09 L H20
Answer:
1.09 L of water
Explanation:
4.36 mol NaCl ×(1L of H20 / 4 mol NaCl) = 1.09 L of water
What did you include in your response? Check all that apply.
If global warming continues, corals will continue to expel the algae from their cells.
Without the algae, corals will die.
Without corals, the algae are not protected and cannot perform photosynthesis.
Without corals, the algae will die.
Answers
Answer:
Press all of them
Explanation:
all of them are always right I just did it
Answer:
All of them.
Explanation:Nothing is wrong here, if you skip it it lowers your grade
you're welcome!!!! :DDDDDDDDDD
GL on ur classes! ily u all3
How many moles of oxygen gas are necessary to completely react with 10.6 moles of propane? C3H8(g) + 5 O2(g) --> 3 CO2 (g) + 4 H2O (l)
Answers
Answer:
53 moles of oxygen, O₂
Explanation:
The chemical equation for the reaction is presented as follows;
C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O (i)
From the above equation, 5 moles of oxygen, O₂, gas reacts completely with 1 mole of propane gas, C₃H₈
Therefore 10.6 × 5 = 53 moles of oxygen, O₂, will be required to react with 10.6 × 1 mole of propane, C₃H₈
The number of moles of oxygen, O₂, necessary to completely react with 10.6 moles of propane, C₃H₈ is 53 moles of oxygen, O₂
What happen to rainwater after it falls? Where does it goes?
Answers
Answer:
of the Drain! What happens to rain after it falls? Rainwater, or snow melt, either soaks into the ground to become groundwater, evaporates, or flows over the surface of the land. The water that flows over the ground is called stormwater or runoff.
help me get this right no links
Answers
2. A dark shadow covers a small part of the Sun's surface.
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