Answer:
a. True
b. True
c. True
d. False
Explanation:
At equilibrium condition, the amount of products must be equal to the amount of reactants means 50% of reactant is converted into product and 50% of product is converted into reactant. During equilibrium, the concentration of the products as well as reactant does not change. Yes, a collision between reactants is needed to initiate and complete the reaction. If the concentrations of the reactants are too large, the rate of the forward reaction will be faster than the reverse reaction, and some of the reactants will be converted into products until equilibrium is achieved.
En un recipiente se colocan 250 ml de agua, clavos de hierro, aceite y una pequeña cantidad de sal común. Indique:tipo de sistema
b. cantidad de fases
c. cantidad de componentes
Answer:
Los sólidos tienen una forma y un volumen definidos. Los líquidos tienen ... Para describir las fases sólida, líquida y gaseosa. El agua puede tomar muchas formas. ... Un líquido familiar es el mercurio metálico.
A pan containing 20.0 grams of water was allowed to cool from a temperature of 95.0 °C. If the amount of heat released is 1,200 joules, what is the approximate final temperature of the water? (5 points)
75 °C
78 °C
81 °C
87 °C
Answer:
78° C.
Explanation:
The final temperature of water is 81℃ , if it is allowed to cool from a temperature of 95 and it releases heat of 1200J.
What is the final temperature of water?In the following question we will apply specific heat Capacity equation
q=mct Δt
q= 1200J m= 20 g c= 4.186 T₁= 95 ℃
1200= 20 ✕4.186(95-T₂)
T₂=81℃
Hence, The water cools to 81℃ temperature
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Pls I need help with these I have a test in 1 hour
Answer:
option e
hope helps u
have a nice day
Which of the following MOST LIKELY causes the rate of a chemical reaction to increase?
Decreasing the reaction temperature
Grinding up a solid reactant
Adding an inhibitor
Using a larger container
Explanation:
Reactant concentration.
Increasing the concentration of one or more reactants will often increase the rate of reaction. This occurs because a higher concentration of a reactant will lead to more collisions of that reactant in a specific time period.
Balance the following equation:
Cr + __02 +_Cr203
Answer:
4Cr + __302 -->_2Cr203.....
I have to do this for homework please help :)
Answer:
1..... nucleus
2......electron cloud
3.......protons
4........Neutrons
5..........electron
6............electrons
7...............Isotopes
8.....,...........ions
9....................charge
21.) This substance consists of two or more nonmetal elements in a fixed ratio.
a.) element
b.) mixture
c.) molecule
d.) compound
Answer:
Molecule
Explanation:
when two or more than two non-metal elements are combined then it form Molecule.
How do the products of a nuclear fusion reaction differ from reactants?
Answer:The products of nuclear fusion are by far heavier than the reactants. Nuclear fusion is the combination of small atomic nuclei into larger ones.This reaction is accompanied with the release of a large amount of energy:
²₁H + ²₁H → ⁴₂He + energy
In the above reaction,
two hydrogen atoms fuse and produce a heavier helium atom which differs from the combining atoms.
Explanation:
What is hydrogen plus hydrogen
Answer: Proton
Explanation:
hydrogen ion is the basis of the pH scale. H:– = Hydride. Hydride is a hydrogen atom which has an extra electron.
The speed of a wave is how far the wave travels in one unit of ___.
Answer:
The speed of a wave is how far the wave travels in one unit of time. (eg: seconds)
Explanation:
For instance, if the crest of a wave travels 30 meters in 2 seconds, the speed of that wave is 15 m/s.
A chemical lab has isolated a metallic element from a compound. The metal
is highly reactive by itself and reacts with chlorine in a 1 to 1 ratio. In which
group of the periodic table is this element most likely found?
O A. 18
B. 17
C. 1
D. 2
SUBMIT
Answer:
C. 1
Explanation:
Group 1 metals are highly reactive (such as Sodium) and form 1 to 1 ratio of ions with halogens (such as chlorine, bromine etc).
This happens because group 1 element can donate 1 valence electron to fulfill their octet rule and halogens can receive 1 valence electron to fulfill their octet.
Why is it useful to know the background level of extinction?
It is part of the scientific process to observe changes in nature.
If current rates greatly exceed background rates, scientists say there is a chance of a
mass extinction event happening.
NOAA and FWS are required by law to compare background rates to current rates.
Scientists want to see if increased extinction rates will threaten the human population.
Answer:
NOAA and FWS are required by law to compare background rates to current rates.
Explanation:
Answer:
If current rates greatly exceed background rates, scientists say there is a chance of a mass extinction event happening.
Explanation:
Scientists compare current rates of extinction to the background rate to see if there is a potential problem developing.
I got it right on the quiz.
3. Which model has properties most similar to chlorine?
Model A
Model B
Model C
Model D
Answer:
bnsjsbbakakaisbsbwnsjznss
Explanation:
cnsjzjsnsnsjs ssnsnsnzksmnznnzna
How does the electron-cloud model describe electrons?
The exact position of an electron can be known.
An electron can be found at certain distances from the nucleus.
An electron has a high probability of being in certain regions.
Each electron follows a specific path around the nucleus.
Answer:
C. An electron has a high probability of being in certain regions.
Explanation:
In the electron cloud model, there are no electron-orbits around the nucleus but a cloud. This cloud has various densities with respect to distance from the nucleus. The most dense region of the cloud (which is the region close to the nucleus) is where electrons has the highest probability of existence.
The model explains that an electron a greater chance of being in the region closer to the nucleus. Thus, an electron has a high probability of being in certain region of the cloud about the central nucleus. And an electrostatic force exists between the nucleus and the electrons.
Answer:
c
Explanation:
ASAP:
The gases in a can of compressed air are at a temperature of 274.9 K and a pressure of 227.2 kPa. If the gases in the can reach a pressure of 845.3 kPa, the can will explode. What temperature (in K) would the can need to be heated up to for it to explode?
Answer:
845.4
Explanation:
plz help me solve this question is it A,B,C or D
Hydrochloric acid reacts with sodium hydroxide to form sodium chloride (the salt) and water. Sodium chloride is made up of Na+ cations from the base (NaOH) and Cl- anions from the acid (HCl). HCl+NaOH→H2O+NaCl.
Chemical A breaks down into chemical B. At t=0, [A] = 0.100 M. At t=10.0 s, [A] = 0.075 M. What is the average reaction rate?
Answer:
a0.0075 mi i think so ok but average is need to add and divide
30.) What charge would you expect from a Group 16 atom when it becomes an ion?
a.) 1-
b.) 2+
c.) 1+
d.) 2-
Name the compound containing only fluorine and hydrogen.
The answer is Hydrogen fluoride. Why does hydrogen come first?
PLEASE HELP!!!
Two buildings are 21m apart. The height of the taller building is 207m. The angle of depression from the top of the taller building to the top of the shorter building is 15°. Find the height of the shorter building to the nearest meter. (please try to include diagram)
Answer:
dfgdhfjkl;jhgfdsAZXcvdfcgbwegbfgvdavsbhgsvadrfgvrdt
Explanation:
How many elements are in the reaction?
HCL+NaOH ——-> H2O+NaCL
The pollen grains move in water randomly because of
A. The collisions
between water particles and pollen grains
B. they dissolve in water
C. the gravit
From the following equations, which one is an example of a decomposition reaction? *
2Cl + 2Na = 2NaCl
NaCl + Fe = FeCl + Na
2NaCl = 2Na + 2Cl
FeCl + Na = NaCl + Fe
Answer:
2NaCl = 2Na + 2Cl
Explanation:
Sodium chloride decomposes to form sodium and chlorine
Describe wildfires. How is climate change impacting wildfires ?
Answer:
Hey mate.......
Explanation:
This is ur answer......
Climate change has been a key factor in increasing the risk and extent of wildfires in the Western United States. Research shows that changes in climate create warmer, drier conditions. Increased drought, and a longer fire season are boosting these increases in wildfire risk. But global warming has changed some of the underlying variables that make wildfires more or less likely to occur every year. Warmer temperatures increase the likelihood that fires will burn more intensely. They also cause snow to melt sooner, and lead to drier soils, forests, and plants, which act as kindling.
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In the Rutherford nuclear-atom model, ________. Group of answer choices mass is spread essentially uniformly throughout the atom the three principal subatomic particles (protons, neutrons, and electrons) all have essentially the same mass and mass is spread essentially uniformly throughout the atom the heavy subatomic particles, protons and neutrons, reside in the nucleus the light subatomic particles, protons and neutrons, reside in the nucleus the three principal subatomic particles (protons, neutrons, and electrons) all have essentially the same mass
Answer:
the heavy subatomic particles, protons, and neutrons, reside in the nucleus
Explanation:
The atom is envisioned by Ernest Rutherford as miniature solar system, involving electrons that is orbiting around a very massive nucleus, it is regarded as mostly empty space, having nucleus that occupy small part of the atom. He discovered that atom is regarded as mostly empty space, having a mass concentrated central nucleus. This nucleus is charged positively and it is been surrounded by electron which is negatively charged t
Large distance. In In the Rutherford nuclear-atom model,the heavy subatomic particles, protons, and neutrons, reside in the nucleus
When a car uses a gallon of gas, how much carbon dioxide is emitted into the environment? I give branlyest
Answer:
19.5
Please tell me if wrong.
When a car uses a gallon of gas, 22.0 miles per gallon of carbon dioxide is emitted into the environment.
What happens when carbon dioxide is emitted?After being released into the atmosphere, carbon dioxide (CO₂) is initially quickly dispersed among the atmosphere, the upper ocean, and plants.
The sources of carbon dioxide emissions include both natural and human activities. Decomposition, oceanic discharge, and respiration are examples of natural sources.
The annual carbon dioxide emissions from a typical passenger automobile are around 4.6 metric tonnes. This estimates that the typical gasoline car on the road today gets roughly 22.0 miles per gallon of fuel and travels about 11,500 miles annually.
Thus, 22.0 miles per gallon of carbon dioxide is emitted into the environment.
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When Magnesium and Oxygen react 204 g of MgO is actually produced. The calculated theoretical yield is 216 g. What is the percent yield for this reaction?
6 %
11.2 %
94 %
100%
Answer:
94%
Explanation:
204/216=.94444
.94444*100=94.44%
If pressure is kept constant and the temperature of a gas is doubled, what will happen
to the volume?
A. It will double.
B. It will remain constant
C. It will decrease to 25% of its original volume.
D. It will decrease by half.
I believe it's (A). It will double.
Explanation:
Charles law states that the volume of an ideal gas is directly proportional to the absolute temperature at constant pressure. (Charles's law).
The pressure, volume, and temperature are the main factors of the ideal gas. At constant pressure when the temperature is doubled, then volume also gets doubled. Thus, option A is correct.
What is an ideal gas law?The ideal gas law has been known as the law that relates the pressure, volume, moles, and temperature of the gas particles. The relationship between the volume and the temperature of the gas was given by Charle's law.
According to Charle's law, the volume and the temperature have been known to have direct relation when the factor of pressure is said to be constant. If they exhibit the direct relation then doubling the temperature will double the volume of the gas.
Therefore, option A. the doubling of temperature doubles the volume is correct.
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The concentration of a reactant dropped from 1M to 0.6 Min 15 seconds.
Calculate the reaction rate of this reaction in M/min.
Answer:
1.6 M/min
Explanation:
Step 1: Given data
Initial concentration of the reactant: 1 MFinal concentration of the reactant: 0.6 MTime elapsed (t): 15 sStep 2: Convert "t" to min
We will use the conversion factor 1 min = 60 s.
15 s × 1 min/60 s = 0.25 min
Step 3: Calculate the reaction rate
We will use the following expression.
r = -ΔC/t
r = -(0.6 M - 1 M)/0.25 min = 1.6 M/min
Sam is visiting the desert. He is standing beside a cactus watching a
snake move across the sand. There is a lizard basking in the sun on a rock
nearby. Which of the following correctly identifies the biotic and abiotic
parts of the ecosystem?
Abiotic: Rock, Sand, Sun Biotic: Cactus, Lizard, Sam, Snake
Abiotic: Cactus, Rock, Sam Biotic: Lizard, Sand, Snake, Sun
Abiotic: Cactus, Rock, Sand, Sun Biotic: Lizard, Sam, Snake
Abiotic: Cactus, Lizard, Sam, Snake Biotic: Rock, Sand, Sun
Answer:
A
Explanation:
Rock sand sun arent living. cactus lizard sam and snake are living or biotic