The neutral phase of a ph scale is 7.
A ph higher than 7 indicates that the substance is basic in nature.
14 is the most basic and 8 is the least basic
A ph lower than 7 indicates the substance is acidic in nature.
1 is the most acidic and 6 is the least acidic.
3. Classify each reaction as exothermic or endothermic. (4 marks)
a. Energy + SO2(g) S(g) + O2(g) _________________________________
b. Draw a potential energy diagram for the reaction above:
Energy + SO2(g) -----> S(g) + O2(g) is an edothermic reaction owing to te fact that energy is a reactant in the equation.
What is an endothermic reaction?An endothermic reaction is one in wioch energy is supplied to the system in order to enable the breakdown of bonds. Hence, the reaction vessel feels cool as energy is withdrawn from the surroundings.
The reaction; Energy + SO2(g) -----> S(g) + O2(g) is an edothermic reaction since energy is a reactant in the equation.
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How to find moles of a cooking recipe? Chemistry project help please
The moles of substances required to make scrambled eggs is given in the cooking recipe for scrambled eggs.
What is the moles of a substance?A mole of. a substance is the amount of that substance which contains the avogadro number (6.02 × 10^23) of particles in it.
A mole of a substance is usually given as a standard unit measurement of that substance.
The mass of 1 mole of is known as the molar mass if that substance.
From the recipe for preparing scramble eggs given, the moles of substances required are as follows:
6 moles of eggs1 mole of red bell pepper1 mole of green bell pepper1/2 moles of carrots1/4 moles of olive oil 1/4 cup of saltTherefore, the moles of substances required to make scrambled eggs is given in the cooking recipe for scrambled eggs.
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A 4M solution means there are
______ moles of ______
per one _____ of _____.
There are _____ ml within _____ Liter.
Q. How many moles of HCL are within 2,000ml of a 0.4M solution of HCL?
Q. How many grams of KCl are within 2L of a 0.4M KCL solution?
Answer:
Molarity=number of moles÷volume(L)
A scientist is studying fish. She wants to sort many different kinds of fish into groups by the way they swim. Which characteristic would the scientist most likely use when grouping the fish? A. number of teeth B. fin position C. number of stripes D. body color
Answer:
B.fin position
C.colour of stripes
What does Earth rotate on? (2 points)
a
Its axis
b
Its continents
c
Its countries
d
Its poles
help asap i'll give u 100 points and brainliest
Answer:
its axis
Explanation:
the earth rotates on its axis 24 hrs a day in relation to the sun.
How many grams of rock salt, Naci, do you need to add to a 3.78 kg of ice, to get the temperature to drop to -190?
1129.9 grams of rock salt, NaCl should be added to a 3.78 kg of ice to get the temperature to drop to -19 °C.
What mass of rock salt is required?The mass of rock salt required to lower the temperature of ice by 19 °C is determined using the Blagden's Law given below:
[tex]ΔT = iK_fm[/tex]where;
ΔT = Change in temperature in °Ci = van't Hoff factorKf = molal freezing point depression constantm = molality of the solute in mol solute/kg solvent.The van't hoff factor for NaCl, i = 2
Kf for water/ice = 1.86 °C kg/mol
molalityof NaCl = (mass/molar massl) / kg of ice
The mass of NaCl is derived as follows:
mass of NaCl = molality × mass of ice × molar massmolar mass of NaCl = 58.5
mass of ice = 3.78 kg
Let molality of NaCl = X
ΔT = 19 °C
Inputting the values above in the equation of Blagden law:
19 = 2 x 1.86 °C kg/mol x X
X = 5.11 mol/kg
Then, the mass of NaCl will be;
mass of NaCl = 5.11 × 3.78 × 58.5
mass of NaCl = 1129.9 g
Therefore, 1129.9 grams of rock salt, NaCl should be added to a 3.78 kg of ice to get the temperature to drop to -19 °C.
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sodium oxide can react with water to produce sodium hydroxide. in the reaction, how many moles of sodium hydroxide will be produced.
Answer: 2 mol of NaOH
Explanation:
The balanced chemical equation for the reaction is:
Na2O + H2O --> 2NaOH
Looking at this, we can see that 1 mol of Na2O will react with 1 mol of H2O to produce 2 mol of NaOH
6. Zn + 2HCl → ZnCl2 + H2 How many moles of HCl are produced from the reaction of 2.25 moles of zinc?
Answer:
E. 16.6 mol HCl
Explanation:
The equation for the reaction is;
Zn + 2 HCl --> ZnCl2 + H2
From the reaction 2 moles of HCl produces 1 mole of ZnCl2
Therefore; 8.3 moles of ZnCl2 will be produced by;
= 8.3 moles ×2
= 16.6 Moles of HCl
Therefore; E. 16.6 mol HCl
In the Lewis symbol for a fluorine atom, there are __________ paired and __________ unpaired electrons.
In the Lewis symbol for a fluorine atom, there are 4 paired and 1 unpaired electrons.
However, paired electrons simply means are 2 electrons occupying the same orbital in an atom or molecule of a substance
On the other end, unpaired electron is a single electron that occupies an orbital of an atom.
What is an atom?An atom is the smallest part of an element which can take part in a chemical reaction.
Some atoms of elements are:
MonoatomicDiatomicTriatomicPolyatomicIn conclusion, in the Lewis symbol for a fluorine atom, there are 4 paired and 1 unpaired electrons.
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Answer: 6, 1
Explanation:
What is the name of an isotope with 23 protons and 25 neutrons?
Select one:
Cadmium
Vanadium
Chromium
Manganese
Answer: Vanadium
Explanation:
Need help with Chem.
Answer the question!
Answer:
i think 50C
Explanation:
It only makes since cause if its 4.43 and u want the volume to be 3.13 it has to me 50C
Use Charles law
[tex]\\ \rm\rightarrowtail V_1T_2=V_2T_1[/tex]
[tex]\\ \rm\rightarrowtail 4.43T_2=(70)(3.13)[/tex]
[tex]\\ \rm\rightarrowtail 4.43T_2=219.1[/tex]
[tex]\\ \rm\rightarrowtail T_2=49.4°C[/tex]
Contrast (Compare) the Sun's gravitational pull on Earth when Earth is
closest to the Sun and when Earth is farthest from the sun.
Answer:
gravity equation.
Explanation:
use this gravity equation
F= G(m1*m2/d²)
Pots A and B both have plain soil, bean seeds, and the same amount of light. Pot B receives more water (see table). After 50 days the plants are measured. Based on the data, which of the following conclusions can NOT be drawn from the data table?
A plant that receives more water will have more mass
The amount of water a plant receives affects its growth
The taller a plant is, the more mass it has
A plant that receives more water will grow t
A. water per day: 20 m/ height: 24cm/ mass: 3.1g B. Water per day: 60 ml/ height: 24cm/ mass: 9.6g
I think that the answer to this question is the third option. These two plants are of the same height but plant B has more mass. So therefore the statement is not true.
If this is a multiple-choice, then I would also select the fourth option along with the third. Plant B received more water, but it is the same height as plant A.
I hope my answer is satisfactory, and that I was of help to you.
-Toremi
giving brainliest please help!
How many joules are required to eat 5.25 g of titanium from 85.5 celsius to 132.5 celsius
The amount of energy required to eat 5.25 g of Titanium from 85.5 celsius to 132.5 celsius is 129 joules.
How do we calculate required heat?Absorbed or released amount of heat will be calculated by using the below formula as:
Q = mcΔT, where
m = mass of titanium = 5.25g
c = specific heat of titanium = 0.523 J/gram degree celsius
ΔT = change in temperature = 132.5 - 85.5 = 47 degree celsius
On putting these values on the above equation we get,
Q = (5.25)(0.523)(47) = 129 joules
Hence required heat is 129 joules.
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Which of the following is an example of an insoluble substance being added to water?
When added to water, the substance quickly falls to the bottom and then dissolves.
The substance has disappeared after being poured into the water.
The substance makes the water cloudy and then forms a layer on top of the water.
The water remains clear after the substance is stirred into the water with a spoon.
Answer:
Explanation: “Insoluble” generally means that a substance does not dissolve in water. Some examples include: sand, fats, wood, metals, and plastic. When we put them in water and try to mix them, they will not dissolve.
Explanation:
According to the kinetic molecular theory, the molecules of an ideal gas is
Answer:
exert no attractive forces on each other, or on the walls of the container
Explanation:
Which state of matter of water is the most dense ?
A. Gaseous water vapor
B. Liquid water
C. Solid ice
D. Water and ice are equally dense.
7. Reproduce the following sentences as indicated in brackets. a. Urmila always goes to temple, .................... ? (Supply the correct question tag) b. The baby was playing with a doll. (Change into interrogative) c. Peter will start a business next year. (Change into "when" question) d. They .............. (not finish)......... the work yet. (Put the verb in the bracket in the correct tense) e. She said to me, "My brother knows you." (Change into indirect speech) f. Ram married Sita. (Change into passive voice)
Answer:
a. Urmila always goes to the temple, doesn't she?
b. Was the baby playing with the doll?
c. When will Peter start a business?
d. They have not finished the work yet.
e. She told me that her brother knows me.
f. Sita was married by Ram.
Explanation:
A. In grammar, a question tag is a very short clause at the end of a statement which changes the statement into a question. For example, in 'She said half price, didn't she?' , the words 'didn't she' are a question tag.
B. Interrogative questions/sentences often have to get a yes/no answer.
C. The "next year" will be the answer to that question. U need to ask when.
D. The have not done the work yet, therefore the answer would change from "not finish" to "have not finished"
E. Indirect speech is speech which tells you what someone said. It's like the game "telephone" indirect speech is what you tell someone else, what another person said, or what someone else tells you what another person said.
F. Passive voice means that a subject is a recipient of a verb's action.
what is ozen. gas? How is it formed?
[tex]\sf\huge\underline\purple{Ozone\: Gas:-}[/tex]
Ozone, O3, an unstable, blue, diamagnetic gas with a characteristic pungent odor, protects the earth and its inhabitants from intense ultraviolet radiation from the sun.[tex]\rightarrow[/tex]Ozone is an allotropic molecular form of oxygen containing three atoms of oxygen (O3). Ozone O3 is generated through the passage of oxygen O2 through a high voltage potential resulting in the attachment and formation of a third oxygen atom.
[tex]\rightarrow[/tex]The molecular formula for ozone (O3) was established by Soret (1863) by taking the ratio of the change in volumes when O3/O2 mixtures were either heated or exposed to turpentine and cinnamon oil.
Formation:-[tex]\rightarrow[/tex]Ozone is formed when heat and sunlight cause chemical reactions between oxides of nitrogen (NOX ) and Volatile Organic Compounds (VOC), which are also known as Hydrocarbons. This reaction can occur both near the ground and high in the atmosphere.
__________________________________
Hope it helps you:)
What is the molarity of a solution that contains 30. grams of naoh in 500. milliliters of solution?.
Answer:
1.5 mol/L
Explanation:
molarity = moles/litres
NaOH = 23 + 16 + 1 = 40 g/mol
[tex] ? \: mol \: naoh \: = 30 \: g \: naoh \: \times \\ \\ \frac{1 \: mol \: naoh}{40 \: g \: naoh} = 0.75 \: mol \: naoh[/tex]
molarity = 0.75 mol NaOH ÷ 0.5 L = 1.5 mol/L NaOH
What are the evidences that support the big bang theory?.
Answer:
Almost all the galaxies were at the time moving away from us . All the elements that we see around us . Cosmic microwave background radiation . The formation of galaxies and the large scale structure of the cosmos .
Explanation:
Question 4 of 25
How do scientists write very large numbers?
O A. They round off all numbers to a few digits after the decimal.
O B. They express the numbers using scientific notation.
O C. They divide all numbers by a constant to reduce the size.
O D. They simplify the numbers by deleting the exponents.
Answer:
B.
Explanation:
What would be the mass of 9.76 x 1022 formula units of SrCla?
Answer:
25.7 g
Explanation:
I don't know what to put here hahaha, I hope my answer helps you ^^
Which of the compounds below will dissociate in water? Check all that apply.
Ba(NO3)2
CaSO4
CO2
H2CO3
Mg3(PO4)2
The compounds that can dissociate in water from the options given below are;
Ba(NO3)2
CaSO4
Mg3(PO4)2
What is dissociation of compounds?Dissociation of compound is the process by which compounds degraded into smaller unit which can also recombine to form larger one in another condition.
When ionic compounds dissociate in water, the water molecules separate the ionic crystal. This is because of the attraction between the positive and negative ions in the crystal.
Therefore, The following compounds dissociate in water.
Ba(NO3)2
CaSO4
Mg3(PO4)2
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Why are water and hydrogen peroxide different substances even though they are both made up of hydrogen and oxygen atoms?
Spring tides happen 2 times each month at the _and_phases
Neap tides happen 2 times each month at the _and_phases
Answer:
Spring tides happen 2 times each month at the New and Full phases
Neap tides happen 2 times each month at the First Quarter and Third Quarter phases
Write balanced chemical equations for:
a) coke + oxygen --> carbon dioxide
b) carbon dioxide + coke --> carbon monoxide
Answer:
a. C (s)+ 02(g)---->C02(g)
b. CO2(g) +C(s)--->2CO(g)
Explanation:
This reaction is the method of purification of some precious metals such a iron(Fe) in it's ore. a.The carbon(coke) is oxidized to carbon (IV) oxide
b. the carbon dioxide gas is reduced with the same carbon to produce carbon(II) oxide.
what is the concentration of OH− in a solution with a pOH value of 6.09
Answer:
I'm not sure
Explanation:
I'm just not sure