Question 1 S
A student left a sealed jar of water outside her home. Water can be a solid liquid or gas When she put it outside the water was a
solid Twelve hours later, the water had changed phase and was a liquid. What happened to the water molecules?
A Before the student left, the molecules were moving in place. After the molecules were moving around each
other
B Before the student left, the molecules were moving around each other After the molecules were moving away
from each other.
C Before the student left the molecules were moving around each other. After the molecules were moving in
place
D. Before the student left the molecules were moving away from each other. After the molecules were moving
around each other
Answer:
A
Explanation:
Before the student left, the water molecules were moving in place, then after that, the water molecules were moving around each other.
Option A is correct.
Water can exist in three phases of matter as solid, liquid, or gas. In the solid state, the constituent of the particles is closely packed together.
In the liquid state, the particles are held together by intermolecular forces and they move around each other.In the solid state, before the student left the sealed jar outside her house, the particles molecules of the water are moving in place closely packed together, but after a period of time, the molecules start to move around each other.
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How many atoms of which elements are represented by the following formula?
C6H12N
Answer:
19 atoms
Explanation:
6 carbon, 12 hydrogen, one Nitrogen
Zn(s) =PbCI2(aq) ZnCI2(aq)+Pb(s) reaction type
Answer:
Redox reaction
Explanation:
The study of the interaction between animals and plants within a specific environment is called
Answer:
The study is called ecology
Explanation:
Mark as brainliest if I'm correct
Answer:
i think its ecology im not sure since im bad at math lol
Which statement describes the relationship between bonding and surface tension?
A. The more hydrogen bonds a molecule can make, the lower the surface tension.
B. The more jonic bonds a molecule can make, the higher the surface tension
C. The more hydrogen bonds a molecule can make, the higher the surface tension.
D. The more ionic bonds a molecule can make, the lower the surface tension.
Answer: c
Explanation:
Answer:
C. The more hydrogen bonds a molecule can make, the higher the surface tension.
Explanation:
Draw the structure of the product formed in the reaction of an epoxide with ethoxide ion. If more than one stereochemical product is possible, draw only one isomer.
Answer:
See explanation and image attached
Explanation:
The most common reaction of epoxide rings is the ring opening reaction. This ring opening reaction serves to relieve the stress in the ring.
Now, The first step in the acid catalysed epoxide ring opening reaction is the protonation of the epoxide.
This is now followed by the attack of the nucleophile. Subsequent deprotonation regenerates the acid catalyst and yields the product.
The structure of the product formed in the reaction of an epoxide with ethoxide ion is attached below as we get 2 substituted alcohol product.
What are epoxides?Epoxides are comes under the category of ether, which are the three membered ring structure.
Due to its ring structure, strain or stress is present in the three membered ring which makes it available to react easily with nucleophile. Ethoxide ion acts as a nucleophile in this reaction which attacks on the electrophilic carbon of the epoxide and resulting into the break up of bond and opening of ring.
As a result of this reaction we get the 2 substituted alcohol as attached in the image.
Hence structure of the product is attached below.
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What is the concentration of sodium ions in 0.185 M Na2CO3?
Answer:
0.370 M
Explanation:
Step 1: Given data
Molar concentration of the sodium carbonate solution: 0.185 M
Step 2: Write the balanced dissociation equation
Sodium carbonate is a strong electrolyte that dissociates according to the following equation.
Na₂CO₃(aq) ⇒ 2 Na⁺(aq) + CO₃²⁻(aq)
Step 3: Calculate the molar concentration of sodium ions
The molar ratio of Na₂CO₃ to Na⁺ is 1:2.
0.185 mol Na₂CO₃/L × 2 mol Na⁺/1 mol Na₂CO₃ = 0.370 mol Na⁺/L
The reaction used to produce solid iron ore is below.
Fe2O3 (s) + 3CO (g) à 2Fe (s) + 3CO2 (g)
The reaction of Fe2O3 with CO has a theoretical yield of 129 grams solid Fe. In the laboratory, your reaction produces 87.4 grams of solid Fe. What is the percent yield?
☆ Electrons are much more unpredicable
the what bour said
Answer:
this is very true
Explanation:
Help plzzzzz it's due today ----- Would Shining light on the reaction increase or decrease the reaction rate
Answer:
increase
Explanation:
Reactions that are initiated by light are called photochemical reactions. The brighter the light, the faster the reaction.
Answer: An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision (Figure. 17.5 “Temperature and Reaction Rate”).
Explanation:
How do we determine climate?
a
I have no idea
b
Precipitation and weather
c
Temperature and weather
d
Precipitation and temperature
Answer:
D but I’m traitor figure out y my question is precipitation helps determine climate by. Weathe. My options are The interaction of the prevailing winds upon land or oceans. The development of local storms. The passage of weather fronts. All of the above
Explanation:
1. Oxygen gas has a pressure of 680 mmHg. What is the pressure in atmospheres?
If a sample of oxygen gas occupies 30.0 mL at -10°C and 680 mmHg, what is the volume at 10°C and 310 mmHg? Express your answer to two significant figures and include the appropriate units.
Which of the following is a binary ionic compound?
a Sulfuric acid
b Hydrogen sulfide
с
Sodium fluoride
d None of the above
Answer:
D; none of the above
Explanation:
Binary ionic compounds are composed of one metal and one nonmental.The metals are always the first element whereas the nonmetals are the second element.
Answer: Sodium fluoride
Why do not all rock types contain fossils?
Excessive heat and pressure can destroy fossils.
Fossils can only be created in certain places around the world.
Fossils cannot be created near volcanoes.
Fossils are too large to be found in igneous and metamorphic rocks.
Answer:
Igneous rocks form from molten rock, and rarely have fossils in them. Metamorphic rocks have been put under great pressure, heated, squashed or stretched, and fossils do not usually survive these extreme conditions. Generally it is only sedimentary rocks that
Explanation:
Hope it helps, some how.
Your welcome :)
Cytokinesis happens differently for plant and animal cells. Both separate cytoplasm between two new daughter cells. However, which type of cell cytokinesis has the old cell membrane begin changing into a new cell wall between the two connected newly formed daughter cells?
Question 1 options:
Both
Plant cell cytokinesis
Animal cell cytokinesis
Neither
50 points need answer will give crown
Answer:
C
Explanation:
Squirrels eat acorns for energy and to grow and repair tissues. How is an acorn used to build squirrel muscle?
The elements in the acorn can be rearranged to make the molecules the squirrel’s body needs
The energy from the acorn warms any damaged muscle and allows it to repair itself and heal
The proteins found in acorns are the same as squirrel muscle proteins, so they attach to muscle cells
Once the acorn has been digested by the squirrel, the carbohydrates are converted to muscle tissue
Answer:
The elements in the acorn are rearranged to make the molecules the squirrel's body needs. The proteins found in acorns are the same as squirrel muscle proteins, so they attach to muscle cells.
Explanation:
hpoe this helps
How many moles are in 2.35 x 1024 molecules of H2?
Answer:12
Explanation:because it’s 12
Which pair of elements will form an ionic bond?
Answer: A pair of elements will most likely form an ionic bond if one is a metal and one is a nonmetal. These types of ionic compounds are composed of monatomic cations and anions
Explanation:
formula for trichlorine tetroxide
If false rewrite the statements to make them correct True or False.
1. Only particles in the solid state are in motion.
2. The particles of a solid have more energy than those of a gas.
3. In a glass of iced tea, tea is the solute.
When Copper metal is exposed to Oxygen gas, solid copper (11) oxide forms on the surface.
What is the formula for the following compound: Copper
Answer:
jjsydydbbeyxgxhx
Explanation:
nnhejjej
Compound X has a molar mass of 416.48 g mol
and the following composition:
element
mass 0/0
phosphorus
14.87%
chlorine
85.13%
Write the molecular formula of X.
Answer:
P₂Cl₁₀
Explanation:
From the question given above, the following data were obtained:
Molar mass of compound X = 416.48 g/mol
Percentage of phosphorus (P) = 14.87%
Percentage of Chlorine (Cl) = 85.13%
Molecular formula of X =?
Next, we shall determine the empirical formula of compound X. This can be obtained as follow:
P = 14.87%
Cl = 85.13%
Divide by their molar mass
P = 14.87 / 31 = 0.480
Cl = 85.13 / 35.5 = 2.398
Divide by the smallest
P = 0.480 / 0.480 = 1
Cl = 2.398 / 0.480 = 5
Empirical formula of compound X is PCl₅
Finally, we shall determine the molecular formula of compound X. This can be obtained as follow:
Molar mass of compound X = 416.48 g/mol
Empirical formula = PCl₅
Molecular formula =?
Molecular formula= [Empirical formula]ₙ
[PCl₅]ₙ = 416.48
[31 + (35.5 × 5)]ₙ = 416.48
[31 + 177.5]n = 416.48
208.5n = 416.48
Divide both side by 208.5
n = 416.48 / 208.5
n = 2
Molecular formula = [PCl₅]ₙ
Molecular formula = [PCl₅]₂
Molecular formula = P₂Cl₁₀
Therefore, the molecular formula of compound X is P₂Cl₁₀
Which kingdom contains both unicellular and multicellular eukaryotic organisms?
Animalia
Fungi
Plantae
Bacteria
what is is pls
WILL GIVE BRAINLIEST!!!
Use this media to help you complete the question.
There are three known forms of hydrogen. These forms are called (isotopes, ions, copies) of each other. Each of these forms will have the same number of (neutrons, protons, electrons) but different numbers of (neutrons, protons, electrons) in their nuclei.
Answer:
Isotopes, protons, netrons
Explanation:
Answer:
There are three known forms of hydrogen. These forms are called Isotopes of each other. Each of these forms will have the same number of protons but different numbers of neutrons in their nuclei.
Explanation:
A reaction that releases energy in the form of heat is called a/n
Answer:
Exothermic reaction!
Explanation:
Exo -> Releases Heat
Endo -> Absorbs Heat
Study the balanced chemical equations for the reactions of methane (CH4) with oxygen and hydrogen with oxygen.
Methane is the main component of fossil fuels such as natural gas.
CH4 + 202 - CO2 + 2H20 + energy
2H2 + O2 + 2H2O + energy
What product of the reaction of methane has an impact on the environment?
Answer:
CO2 (Carbon Dioxide) has a negative impact on environment.
Explanation:
CO2 is a product of combustion of Methane
The carbon dioxide product of the reaction of methane includes an influence on the environment. So, not only does methane contribute to global warming instantly but even, indirectly via the release of carbon dioxide.
What are the harmful causes of methane?As methane exists emitted into the air, it responds in several dangerous ways. It predominantly leaves the atmosphere through oxidization, comprising water vapor and carbon dioxide. Methane inhalation can result in mood modifications, slurred speech, vision problems, memory loss, nausea, vomiting, facial flushing, and headache. In severe cases, there may be differences in breathing and heart rate, balance concerns, numbness, and unconsciousness.
Hence, The carbon dioxide product of the reaction of methane includes an influence on the environment. So, not only does methane contribute to global warming instantly but even, indirectly via the release of carbon dioxide.
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BRAINLIEST AND 20 POINTS!!!
What changes does sugar undergo when heated in a spoon over the flame?
Select one:
A. A physical change, then a chemical change
B. Two physical changes
C. Two chemical changes
D. A chemical change, then a physical change
Answer:
a
Explanation:
1. The number density of conduction electrons in pure silicon at room temperature is about 11016m3. By doping with phosphorous, you desire to increase this number by a factor of 1 million(106). At room temperature, assume that the thermal energy is sufficient that all of the extraelectrons from the P doping enter the conduction band. What fraction of silicon atoms must youreplace with phosphorous atoms
This question is incomplete, the complete question is;
The number density of conduction electrons in pure silicon at room temperature is about 10¹⁶ m⁻³. By doping with phosphorous, you desire to increase this number by a factor of 1 million (10⁶). At room temperature, assume that the thermal energy is sufficient that all of the extra electrons from the P doping enter the conduction band. What fraction of silicon atoms must you replace with phosphorous atoms
Answer:
the fraction of silicon atoms we must replace with phosphorous atoms is 4( 10⁶ - 1 )
Explanation:
Given that;
the number density no = 10¹⁶ m⁻³
Required no = (10¹⁶ × 10⁶) = 10²² m⁻³
Each silicon atom has 4 valence electron,
Hence; Silicon density = 10¹⁶/4
now, if x = No of silicon atoms to be replaced with phosphorous, then;
(10¹⁶/4 - x)4 + 5x = 10²²
10¹⁶ - 4x + 5x = 10²²
10¹⁶ + x = 10²²
x = 10²² - 10¹⁶
Fraction of silicon atoms will be;
⇒ 10²² - 10¹⁶ / 10¹⁶/4
⇒ 4( 10²² - 10¹⁶ / 10¹⁶ )
⇒ 4( 10²²/10¹⁶ - 10¹⁶/10¹⁶ )
⇒ 4( 10⁶ - 1 )
Therefore, the fraction of silicon atoms we must replace with phosphorous atoms is 4( 10⁶ - 1 )
10. Benzene deactivating group is:
a. -OH
b. --CH3
c. -C2Hs
d.-CI
Answer:
CH3
Explanation:
What do a fruit salad, a carbonated beverage, and a pile of clothes have in common?
Answer:
They're all mixtures of something
Explanation: