I don't care but one another time and I have any questions about this email
what is solvent ?
PLSS CAN SOME ONE ANSWER?
Answer:
A solvent is a substance that dissolves and turns into a solution.
Explanation:
Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminium to make aluminium foil
(f) Digestion of food
Answer:
a) Photosynthesis - chemical change
b) dissolving sugar in water -physical change
c) burning of coal- chemical change
d) melting of wax- Physcial change
e) beating of aluminum to make Almunium foil-Physical change
f) digestion of food- chemical change
11.You and a friend find a rusty wire coat hanger near the
beach. The wire has a much larger diameter than the wire in a new coat
hanger. Your friend says the wider wire disproves the Law of Conservation of
Mass. Explain why he is wrong?
Answer:
because he would've not known properly about it!
What is the coldest element
Answer:
Liquid helium
Explanation:
Liquid helium is known to be the coldest element in the world.
It has a ridiculous boiling point of -452 degrees
It is considered the only element on earth that does not freeze to become solid. normally, it is usually in a form of cryogenic fluid or superfluid.
Hence, the coldest element is known as LIQUID HELIUM
Draw the Lewis structure, including unshared pairs, of the following molecules. Carbon has four bonds in the compound.
a. Propane (C3H8)
b. Methanol (CH40)
c. Methyl fluoride (CH3F)
d. Ethyl fluoride (C2H5F)
Explanation:
Refer to attachment.
PropaneMethanol (methyl alcohol) methyl fluorideethyl fluorideThe Lewis dot structure of the following compounds is attached in the attachment below .
Lewis dot structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .
They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.
Learn more about Lewis dot structure , here :
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Li2O + CaF2 --> LiF + CaO
You have 3 moles of Li2O. How many grams of LiF will be produced?
a
8.7 grams
b
156 grams
c
78 grams
d
1.8 x 10^24 grams
Answer:
8.77 grams
Explanation:
Which might you use to observe the properties of matter?
smell
taste
sight
all of the above
Molecular iodine,
I2(g)
dissociates into iodine atoms at 625 K with a first-order rate constant of
0.271s-1
What is the half-life for this reaction?
Answer:
Half-life for this reaction is 2.56s
Explanation:
The general expression in a reaction that follows first-order is:
Ln[A] = -kt + ln[A]₀
Where [A] is concentration of reactant after time t,
k is rate constant = 0.271s⁻¹
[A]₀ is initial concentration of reactant.
Half-life is defined as the time required to decrease the initial concentration of the reactant (I2 in this case) halved.
If [A]₀ = 1
[A] = 1/2
Solving the equation:
Ln[1/2] = -0.271s⁻¹*t + ln[1]
Ln[1/2] = -0.271s⁻¹*t + 0
Ln[1/2] = -0.271s⁻¹t
Ln 2 = 0.271s⁻¹
2.56s = t
Half-life for this reaction is 2.56s
Which of the following BEST describes a way in which water moves in the water cycle?
A. Water falls from the sky as rain. It stays where it falls until it evaporates
B. Water falls from the sky as snow. As the snow melts, the water runs up to Earth's mountains.
C. Water falls from the sky as rain. The water then flows downhill
D. Water falls from the sky as hail. The hail is eventually buried in the ground
Answer: Its A or D
wish i had an actual answer sorry..
The correct answer should be A
Help needed within the next 10 minutes
16.2 g of Water are formed
For the following exothermic reaction, predict under which conditions the reaction will be spontaneous.
2Mg(s) + O2(g) → 2MgO(s)
a. The reaction is always spontaneous.
b. The reaction is spontaneous at high temperatures.
c. The reaction is never spontaneous.
d. Insufficient data is provided to answer this question.
e. The reaction is spontaneous at low temperatures.
Answer:
e. The reaction is spontaneous at low temperatures.
Explanation:
The reaction 2Mg(s) + O2(g) → 2MgO(s) is an exothermic reaction. Let us recall that in an exothermic reaction, heat and light are given out and ΔH is negative (less than zero).
In an exothermic reaction increase in temperature shifts the equilibrium position towards the left and more reactants are produced. However, decrease in temperature shifts the equilibrium position towards the right and more products are obtained.
Also, since the reaction is exothermic, then given that; ΔG = ΔH - TΔS, ΔH is negative for an exothermic reaction and ΔG must be negative for a reaction to be spontaneous. Hence, at low temperature, the value of ΔH - TΔS remains negative (less than zero) hence the reaction is spontaneous.
Hence, Being an exothermic reaction, the process is spontaneous at low temperatures.
______________________________________________
Answer:
Explanation:k
Answer:
Explanation:
PLEASE HELP I WILL GIVE YOU BRAINLIEST
Answer:
GREATER
Explanation:
I just know this
7 g of table salt is added to water in a dish. The dish is then heated until all the water evaporates. This is an example of a
change.
Answer:
Physical change
Explanation:
A physical change is one in which no new substance is formed and can be reversed using physical methods.
When we mix the salt and water, we have merely carried out a physical change. No new substance was formed. To recover the salt, we simply heat the solution to dryness.
Hence, this is an example of a physical change.
The ______ system produces and stores leukocytes and lymph.
Olymphatic
O reproductive
O nervous
O digestive
Answer:
Lymphatic
Explanation:
[tex]\mathrm{\bold Answer:}[/tex]
[tex]\huge\boxed{\sf The~ lymphatic ~system}[/tex]
[tex]\mathrm{\bold Explanation:}[/tex]
[tex]\underline{\sf The~ primary ~function ~of ~the ~lymphatic ~system ~is ~to ~'transport ~lymph'.}[/tex] [tex]\underline{\sf It~ produces~ and~ releases ~white ~blood ~cells, ~know ~as ~lymphocytes.}[/tex] [tex]\underline{\sf The~ lymphatic ~system ~produces ~and ~stores ~leukocytes ~and ~lymph.}[/tex]
[tex]\bold{\mbox Hope~ this ~helps! :)}[/tex]
What is the correct answer
The answer to the problem: (2.1x103) x (4x105) = _____, written to the correct number of significant digits and in scientific notation is:
!! Carat denotes to the power. Example: 10^4 is 104 !!
Answer: The answer is [tex]8.4\times 10^8[/tex]
Explanation:
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
The rule apply for the multiplication and division is :
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
Thus for product of [tex](2.1\times 10^3)\times (4\times 10^5)[/tex]
In this problem, 2.1has 2 significant figures and 4 is an exact number with infinite significant digits thus product will have the least number of significant figures which is 2. So, the answer will be in 2 significant figures.
Therefore, the answer is [tex]8.4\times 10^8[/tex]
11. Which is another way of saying the law of conservation of mass?
Matter cannot be created or destroyed.
The mass of the reactants always equals the mass of the products,
the law of conservation of matter
all of the above
Answer:
all of the above
Explanation:
The Law of Conservation of Mass states that matter is neither created nor destroyed. It also states that in a chemical reaction, the total mass of the reactants equals the total mass of the products.
The Law of Conservation of Matter states that matter can change form through physical and chemical changes but matter is conserved. The same amount exists before and after the change. Matter is not created or destroyed.
So the answer will be all of the above.
Hope that helps.
Determine the electron geometry, molecular geometry, and idealized bond angles for each of the following molecules.
a. CF4
b. NF3
c. OF2
d. H2S
Answer:
CF4- electron geometry- tetrahedral
Molecular geometry- tetrahedral
bond angle- 109 degrees
NF3- electron geometry- tetrahedral
Molecular geometry- trigonal planar
bond angle - less than 109 degrees
OF2 - electron geometry- tetrahedral
Molecular geometry- bent
bond angle- less than 109 degrees
H2S- electron geometry- tetrahedral
Molecular geometry- bent
less than 109 degrees
Explanation:
All the compounds mentioned here are based on a tetrahedron according to VSEPR theory. There are four regions of electron density in each molecule.
However, the presence of lone pairs causes a distortion away from the expected tetrahedral geometry predicted by VSEPR theory.
Hence the presence of one or more lone pairs on the valence shell of the central atom causes distortion from the expected geometry.
Question 2 of 5 A geologist is studying a mountain. It is made up of many relatively even layers of igneous rock. What can the geologist conclude about how the mountain formed? A. It formed when a glacier melted and deposited rock and sediment. B. It was formed by many layers of sediment piling up. O c. It was formed by a series of volcanic eruptions. D. It formed when an earthquake caused faults to form in a body of rock. SUBMIT
Answer:
why did you delete my answer?
Explanation:
The answer is C. It was formed by a series of volcanic eruptions.
The geologist conclude about how the mountain formed should be option c. t was formed by a series of volcanic eruptions.
What are volcanic eruptions?It is the eruption where the lava and the gas should be released from the volcano. Also, it is the dangerous eruption type that we known as the glowing avalanche.
At the time when the geologist is study the mountain so each comprise of layers of igneous rock. so it should be created by the series of volcanic eruptions.
hence, the option c is correct.
learn more about geologist here: https://brainly.com/question/15276837
what is 1.602176*10-¹⁹/ 1.758820*10¹¹C kg-¹
with proper explanation.
or expanded form
Answer:
0.00000000910938;
9.109380 * 10^-9
Explanation:
Given the question :
Given :
1.602176*10-¹⁹/ 1.758820*10¹¹
The numbers are expressed in the form:
A * 10^b ; Where;
A = Coefficient ; 10 = base ; b = exponent
The Coefficients can be divided directly as :
1.602176 / 1.758820 = 0.9109380
Using the division law of indices, the exponents acn be worked out as follows since they have the same base :
10^-19 / 10^-11 = 10^(-19 - (-11)) = 10^(-19+11) = 10^-8
Thus, we have ;
0.9109380 × 10^-8
In standard form:
9.109380 * 10^-9
In Expanded form:
10^-8 = 0.00000001
0.9109380 * 0.00000001 = 0.00000000910938
0.000000009 +
0.0000000001 +
0.00000000000 +
0.000000000009 +
0.0000000000003 +
0.00000000000008
__________________
0.00000000910938
___________________
If, as a pioneer, you wished to warm your room by taking an object heated on top of a pot-bellied stove to it, which of the following 15-pound objects, each heated to 100 degree C, would be the best choice? The specific heat capacity (in J/g- degree C) for each substance is given in parentheses. Iron (0.450), copper (0.387), granite (0.79), gold (0.129), water (4.184).
a. iron
b. copper
c. granite
d. gold
e. H2O
Answer:
e. H₂O
Explanation:
The specific heat capacity is defined as the amount of heat required to raise the temperature of the substance in 1 unit. If you have to warm your room, you have to choose the substance with the highest specific heat capacity value. This substance will retain the highest amount of heat. From the options, the highest value is 4.184 J/g°C (water, H₂O). Thus, 1 gram of water will retain 4.184 J when the temperature is raised to 1°C. That is a higher amount of heat in comparison with, for example, granite, which is able to retain 0.79 J per gram when the temperature is raised to 1°C.
However, you have to consider that the boiling point of water is 100°C, so the temperature at which you have to warm the room is the temperature at which water will be passing to the gas state.
how can we remove the turbidity from water?
Answer:
Settling and decanting is a method to reduce turbidity by letting the water sit for 2-24 hours so that the particulates settle to the bottom of the container. The clear water is then decanted off the top into a second container.
Explanation:
Settling and decanting is a method to reduce turbidity by letting the water sit for 2-24 hours so that the particulates settle to the bottom of the container. The clear water is then decanted off the top into a second container.
Which of the following oxidizing agents is necessary to complete the biochemical reaction below?
aldehyde dehydrogenase
CH3COH + ______ → CH3COOH
a. K2Cr2O7
b. NAD+
c. Cu2+
d. NADH
Answer:
b. NAD+
Explanation:
Aldehydes are oxidized to carboxylic acids in the presence of strong oxidizing agents.
In a biochemical system, the same oxidation reaction occurs by the help of the enzyme alcohol dehydrogenase and NAD+ which is a biological oxidizing agent.
NAD+ is an effective biological oxidizing agent that accepts electrons from molecules and change to its reduced form NADH, which is an effective biological reducing agent that donates electrons. Electron transfer processes are the main functions of NAD+.
List all the physical properties of the iceberg.
Answer: My answer is in the explanation
Explanation:
Physical and mechanical characteristics of iceberg ice were studied from samples collected near the shores of eastern Newfoundland. Although the physical characteristics show considerable diversity, iceberg ice has some common features and is generally porous, lacks significant concentrations of dissolved materials, contains internal cracks and has an irregular interlocking grain structure.
Can anyone help me with my Chemistry homework? I’m struggling and i need help. Since I can’t message anyone in here, I will you my number. Comment yes if you can, I’d really appreciate it
Answer:
yes i can help you ig ........
If you add 0.001 moles of sodium chloride to a liter of water, what will be the pH of the solution?
Answer:
The pH of the resulting solution will be 7.
Explanation:
Sodium chloride is a salt that is formed from the reaction of sodium hydroxide (a strong base) and hydrochloric acid ( a strong acid), as shown below.
[tex]NaOH \ + \ HCl ----> \ NaCl \ + \ H_2O[/tex]
Generally, when strong acids react with strong bases, neutral salts and water are formed. Sodium Chloride (NaCl) is an example of such neutral salts formed.
Since sodium chloride (NaCl) is neutral, its concentration will not alter the pH of the water and the pH of the resulting solution will be 7.
When an atom goes through alpha decay,
a. Only the atomic number changes
b. Only the mass number changes
c. Both the mass and atomic numbers change
d. Neither the mass nor atomic number changes, as only energy is emitted.
A scientist added bacteria and a nutrient medium that could support the growth of the bacteria to a sterilized petri dish. No other materials were added. The graph models the growth of the bacteria over time.
Answer:
A scientist added bacteria and a nutrient medium that could support the growth of the bacteria to a sterilized petri dish. No other materials were added. The graph models growth of the bacteria over time. ... The bacteria did not reproduce in the system, and eventually each individual died at the end of its life cycle.
Explanation:
Plz mark brainliest thanks
Which property is an example of chemical properties?
Answer:
flammability, toxicity, acidity, reactivity , and heat of combustion.
Explanation:
Answer:
Its the banana one
Explanation: