Answer:
Chemistry
Explanation:
Chemistry is considered the central science.
Which area of science is considered the central science?Chemistry is sometimes called "the central science" because it's so important to other fields of science, like biology, geology, astronomy, physics, medicine, engineering, materials science, and many other areas of study.
Which branch of science is the most important?All the branches of science possess their own level of importance, However, physics deals with the fundamental workings of material reality which are central to all other branches of science.
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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.
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.
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
In a titration, a few drops of an indicator are added to a flask containing 35.0 milliiters of HNO3(aq) of unknown concentration. After 30.0 millliters of 0.15 M NaOH(aq) solution is slowly added o the flask, the indicator changes color, showing the acid is neutralized. Which choice is a correct numerical setup for calculating the concentration of the HNO3(aq) solution
Answer:
0.13M HNO3 is the concentration of the unknown
Explanation:
Nitric acid, HNO3, reacts with NaOH as follows:
HNO3 + NaOH → H2O + NaNO3
Where 1mol HNO3 reacts with 1mol NaOH
To find the concentration of HNO3 we must find, as first, the moles NaOH added = Moles HNO3 in the solution:
30mL * (1L / 1000mL) * (0.15mol / 1L) = 0.0045 moles HNO3
In 35.0mL = 0.035L:
0.0045 moles HNO3 / 0.035L =
0.13M HNO3 is the concentration of the unknown
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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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:
A rigid container of O2 has a pressure of 2551 mmHg at a temperature of 713 K. What is the pressure at 273 K?
Answer:977.34
Explanation:
divide 2551 and 273 to get 3.778. then multiply 3.78 by 273 to gry 977.34.
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
30.) What charge would you expect from a Group 16 atom when it becomes an ion?
a.) 1-
b.) 2+
c.) 1+
d.) 2-
Pls I need help with these I have a test in 1 hour
Answer:
option e
hope helps u
have a nice day
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.
How does chemical weathering differ from physical weathering? A. It causes rocks to change color B. It increases the size of the rock C. It makes the rock stronger D. It makes the rock disappear
Answer:
A. It causes rocks to change color
Explanation:
Weathering can be defined as the gradual decomposition of rock. This means, rocks are broken into pieces or sediments through the process of weathering.
There are two types of weathering process:
1. Physical weathering also known as mechanical weathering. This is the breakdown of rocks into smaller pieces without changing the composition of the rock. Physical weathering is caused by the action of ice, wind, plant growth.
2. Chemical weathering: Here, the rocks changes not just in size of pieces but in its composition. This is when other minerals are applied on the rock in other to dissolve it.
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:
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:
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.
Name the compound containing only fluorine and hydrogen.
The answer is Hydrogen fluoride. Why does hydrogen come first?
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.
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
The volume of a gas is 22.4 L when the pressure of the atmosphere is 1.00 atm. If the pressure is increased to 1.05 atm, without changing the temperature, what is the new volume?
K = °C + 273
Question 13 options:
a)
22.4 L
b)
23.5 L
c)
25.2 L
d)
26.3 L
Answer:
b I think
explanation
they're all false tho
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.
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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Balance the following equation:
Cr + __02 +_Cr203
Answer:
4Cr + __302 -->_2Cr203.....
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:
how can you drop a egg the fewest amount of times without them breaking?
Answer:
Drop the egg from your hand, than catch it before it hits the floor. That makes it so it still drops and does not break.
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
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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3. Which model has properties most similar to chlorine?
Model A
Model B
Model C
Model D
Answer:
bnsjsbbakakaisbsbwnsjznss
Explanation:
cnsjzjsnsnsjs ssnsnsnzksmnznnzna
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%