14 + log(7.5 × 10⁻³) ≈
11.875
Answer:
11.875
Explanation:
1 poin
2) Iron is found in the Earth as iron
oxide (Fe203). Iron oxide is reduced
to produce iron. Balance the equation
for the reaction: ...Fe2O3 + ..... →
.....Fe + .....CO2
Your answer
duehrneidudbeneisubebekeidbdbbe
help me with this pleasee
When Na2O is mixed with Mn(NO3)4 it forms NaNO3 and MnO2. We start with 25.0 g
of sodium oxide and 56.1 g of manganese (IV) nitrate.
How many grams of sodium nitrate can be produced?
A salt lover decided to flavor her meal by adding 2.50 moles of sodium chloride,
better known as table salt, to her French fries. She has just added
g of salt
to her fries.
a) 5.00
c) 146
d) 6.02 x 1023
b) 58.4
Answer: C, 146
Explanation:
NaCl has a molar mass of 58.44 g/mol.
To change moles to g, we do:
2.50 moles × 58.44 g/mol = 146.1 g, so C
What are thermal plasmas?
What are thermal plasmas?
Answer:
Plasmas that reach a temperature equal to their surroundings.
Explanation:
I'm studying this right now and took a similar test.
Answer:
Plasmas that reach a temperature equal to their surroundings.
Explanation:
I. Escribe el tipo de reacción al que pertenece cada una de las siguientes reacciones: a. P4(s) + 3 O2 (g) → 2 P2O3 (g) b. CaCO3 (s) → CaO (s) + CO2 (g) c. Cu (s) + AgNO3 (ac) → CuNO4 (ac) + Ag (s) d. Pb(NO3)2 (ac) + NaI (ac) → PbI2 (s) + 2 NaNO3 (ac) e. FeCl3 + 3 NH4(OH) → Fe(OH)3 + 3 NH4Cl f. N2 + 3 H2 → 2NH3 g. Zn + 2HCl → H2 + ZnCl2 h. 2HgO → 2Hg + O2 i. 2H2(g) + O2 → 2H2O(l) j. 2H2O(l) → 2H2(g) + O2(g) k. Mg(s) + Cu(NO3)2 (ac) → Mg(NO3)2 (ac) + Cu(s) l. 2Na + 2H2O – > 2NaOH + H2 m. H2O + CO2 – > H2CO3 n. 2KClO3 – > 2KCl + 3O2 o. NaCl + LiNO3 – > NaNO3 + LiCl
What drives the flow of energy in cycling of matter in the atmosphere
does a single atom make a difference to the properties of matter?
Yes, all things are made of atoms, and all atoms are made of the same three basic particles - protons, neutrons, and electrons. But, all atoms are not the same. ... The difference in the number of protons and neutrons in atoms account for many of the different properties of elements.
A structure that contains a watery fluid which protects the embryo/fetus is 7 7 point
known as? *
chorion
amnion sac
uterus
cervix
Answer:
and unborn baby
Explanation:
an unborn baby
Chemical _____
energy is the energy stored in the chemical
bonds.
Answer:
yeah
Explanation:
it is a form of stored energy that is released when needed by a conversion chemical energy therefore it is a form of potential energy
hope this helps
Which properties describe the elements in group 18?
Sulfur,Iodine,.Carbon,Hydrogen put these lowest to highest
Answer:
The order is Hydrogen, Carbon, Sulfur, Iodine
Explanation:
According to the periodic table. The order is Hydrogen, Carbon, Sulfur, Iodine. You can search up an image of a periodic table, it will help you.
I just got confessed to
but i only like the person 89% out of 100...
what should I do ?
Answer:
:)haha
Explanation:
Answer:
:D
Explanation:
What does Hess's law state? A. The enthalpy of a reaction is positive if it is endothermic and negative if exothermic. B. The enthalpy of a reaction is the sum of the enthalpies of intermediate reactions. C. The enthalpy of a reaction can be determined only from single- step reactions. D. The enthalpy of a reaction can be measured from heat produced in a calorimeter.
Hess's law gave the net change in enthalpy. According to the law, the enthalpy of the reaction is the addition of the enthalpies of the intermediate reaction. Thus, option B is accurate.
What is Hess's law?Hess's law or the law of constant heat summation is the measure of the heat or the enthalpy of the chemical reaction. It was given by the chemist, Germain Hess.
The law states that the enthalpy of the chemical reaction is the sum of the enthalpies involved in the reactants and the products of the reaction. It is independent of the steps involved in the reaction.
Therefore, option B. enthalpy of reaction is the summation of the enthalpy of the intermediates.
Learn more about Hess's law here:
https://brainly.com/question/19480954
#SPJ2
2. Have you ever seen a natural event that surprised
you? Why was it surprising?
Answer:
I have seen many lightning storms before. However, one of the most surprising ones was when I was at my house. It was around midnight when I awoke from the sound of lightning in the distance. I was also half awake so this could be another reason this was the most surprising, but lightning struck near my area. i could see the light through my curtains and the sound was loud enough to awake everyone in my house, even the deep sleepers. I practically jumped out of bed.
When an atom loses an electron, the resulting charge on the atom is ____
Answer:
Positive
Explanation:
The atom will gain a positive charge by losing an electron
Answer:
cation
Explanation:
When one evaporates a pure substance, what would be seen after this evaporation?
Answer:
3
I would like to understand the temperature at which a substance will vaporize when dissolved in a liquid. I have researched this online for hours, but haven't found a conclusive answer. Is it the boiling point of the dissolved substance? I'm attempting to find the temperature at which caffeine vaporizes when dissolved in water or other vegetable glycerin.
Explanation:
I hope this helps a little bit
ANYONE HELP MEE!! ASAP!
Answer:
The energy of the molecules in the apple decreased.
Explanation:
A.
The partial pressure of fluorine gas in a 2.00 L container is 0.85 atm while the partial pressure in that same 2.00L container of argon gas is 1350 torr. a) What is the total pressure, in atm? b) What is the mole fraction of argon in the container?
Answer: The total pressure, in atm is 2.62
b. The mole fraction of argon in the container is 0.67.
Explanation:
a) According to Dalton's law, the total pressure is the sum of individual pressures.
[tex]p_{total}=p_A+p_B+p_C...[/tex]
Given : [tex]p_{total}[/tex] =total pressure of gases = ?
[tex]p_{F_2}[/tex] = partial pressure of fluorine = 0.85 atm
[tex]p_{Ar}[/tex] = partial pressure of Argon = 1350 torr = 1.77 atm ( 760 torr = 1atm)
putting in the values we get:
[tex]p_{total}=0.85atm+1.77atm=2.62atm[/tex]
b) According to Raoult's law, the partial pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the total pressure.
[tex]p_{Ar}=x_{Ar}p_{total}[/tex]
where, x = mole fraction
[tex]1.77atm=x_{Ar}\times 2.62atm[/tex]
[tex]x_{Ar}=0.67[/tex]
The mole fraction of argon in the container is 0.67.
how many grams of hydrogen gas are needed to react with 688 grams of oxygen to make water? (3 sig figs)
Answer:
86 g H₂
Explanation:
The reaction between hydrogen gas (H₂) and oxygen gas (O₂) to produce water (H₂O) is described by the following balanced chemical equation:
2 H₂(g) + O₂(g) → 2 H₂O(g)
As we can see, 2 moles of H₂ reacts with 1 mol of O₂. We have to convert the moles to mass by using the molar mass (MM) of each compound:
MM(H₂) = 1 g/mol x 2 = 2 g/mol
2 moles H₂ = 2 mol x 2 g/mol = 4 g
MM(O₂) = 16 g/mol x 2 = 32 g/mol
1 mol O₂ = 1 mol x 32 g/mol = 32 g
Thus, 4 grams of H₂ reacts with 32 g of O₂. The stoichiometric ratio H₂/O₂ is 4 g H₂/32 g O₂. So, we multiply the stoichiometric ratio by the mass of O₂ we have (688 g) to calculate the grams of H₂ we need:
4 g H₂/32 g O₂ x 688 g O₂ = 86 g H₂
Need done fast please! 41 points
Heat energy provided during phase change is used to:
increase kinetic energy
break intermolecular bonds
break intramolecular bond
decrease kinetic energy
Answer:
I'm not exactly sure but I think it's the first one if I'm wrong tell me so I know and I don't know how I can get points back but if I can figure it out I will tell me if I'm wrong
Why does an atom tend to fill its outer energy shell?
Explanation:
atoms will tend to completely fill their outer shells and will bond with other elements to accomplish this goal by sharing electrons, accepting electrons from another atom, or donating electrons to another atom.
#1 Predict the electron and molecule geometry with 6 bonding domains and a single lone pair.
Bad answers will get reported. Correct answers get 50 points and brainliest!
Answer:
According to VSEPR theory the molecule with six binding domains and single lone pair will have the pentagonal bipyramidal geometry. As it is known that six binding domains means six bonds and a single lone pair means one pyramidal bond, so that it does not repel bonds to a higher extent. Hence, total of seven bonds are required which is provided by the pentagonal bipyramidal geometry. The number of electrons of the molecule will be fourteen 2 from each of the 6 binding domains that makes up to 12 and 2 from the lone pair.
Which statement best describes the polarity of the molecule Sil4?
Answer:
I dont a picture
Explanation:
but the answer is 24
Obtaining crude oil for refining is an example of
A. Constructive occupation
B. Extractive occupation
C. Manufacturing occupation
D. Tertiary occupation
E. Service occupation
Answer:
B: extractive occupation
An experiment was conducted in order to determine the enthalpy change that occurs when 1.0 mole of ice at 0 degrees Celsius melts and becomes 1.0 mole of water at 0 degrees Celsius. The enthalpy change associated with this process is referred to as the heat of fusion of ice. In the experiment a 9.68g sample of ice at 0 degrees Celsius was added to the coffee cup calorimeter containing 278.25 mL of distilled water. The temperature of the water was 22.485 degrees Celsius before The ice was added. The lowest temperature that was recorded after the ice had melted was 19.050 degrees Celsius.
A) find the amount of heat lost or gained by the water in the calorimeter.
B) in this experiment the ice melted and then the temperature of the water produced by the ice increased from 0 degrees Celsius to 19.050 degrees Celsius. Calculate the amount of heat absorbed by the melted ice as it’s temperature increased from 0.000 degrees Celsius to 19.050 degrees Celsius
C) calculate the heat that was gained by the ice during melting process
D) calculate the heat of the fusion of ice
E) is the reaction endothermic or exothermic?
F) energy was transferred from one system to another during this experiment. Identify the two interacting systems and outline the direction of energy flow.
G) was energy conserved in the process? Justify your answer.
Answer: 1
Explanation:
Experiment on enthalpy change.
The enthalpy is a hydrodynamic system that is made to collect the internal energy. The product is of pressure and volume. The experiment was conducted to see the enthalpic change that occurred at a 1.0 mole of ice at 0 degrees.
The answer is 9.68 grams.
The enthalpy change linked with the process is called as a fusion of heat of the ice. The temperature of the water was 278.25 ml hat of distilled water and the calorimeter consisted of 278.35 ml of water.The enthalpy change linked with this process is referred to as the heated fusion of ice. In the experiment a 9.68g sample.Learn more about the experiment was conducted.
brainly.com/question/17376718.
Compound A has 4 moles of hydrogen, 4 moles of oxygen, and
1 moles of silicon. The empirical formula of the compound is _____
Answer:
H₄SiO₄
Explanation:
From the question given above, the following data were obtained:
Hydrogen (H) = 4 moles
Oxygen (O) = 4 moles
Silicon (Si) = 1 mole
Empirical formula =?
Since the number of mole of each atom of the element present is known, the empirical formula of the compound can be written as follow:
H₄SiO₄
I know this is personal but I need some advice, grab some popcorn this is going be a long story.
So I just barely went back to real school and these new people move into the house next to me so the daughter is my sisters friend, the other sister is my friend. So on the first day ( or second or third I don't know) My friend wa sitting by me on the bus then her brother ( a grade higher than mine ) sits by me and starts asking all these weird questions, then he askes a question I don't wanna answer then I say I can't tell him and he starts poking me ( yeah i'm serious ) then I went home and my sister started telling me that her friend ( the girl who just moved to my neighborhood) told her that one of her brothers like me. So I thought that kid on the bus ( her brother) likes me. But then today he kept on looking at me then he moved to the seat by my seat and he started showing me stuff on his phone ( I didn't even ask him to) like I was his best friend, then as I was getting off HE POKED ME AGAIN. So my question is does this guy like me ? ( p.s hes 2 years older than me) Please answer anyone I need help And i need lots of feedback. And hurry. I kinda ike him
Answer:
email me 4
Explanation:
1.0 mole of KCl(aq) is added to which solution to produce a precipitate?
A)
Lit
B)
Ca2+
Agt
D)
Zn2+
Answer:
Ag+
Explanation:
If you imagine as if the problem were double replacement, you would pair the Cl with one of the following ions provided in the choices. As seen on Table F, Ag+ paired with Cl- produces an insoluble compound, hence the precipitate. All the other ions shown in the multiple choice section, when paired with Cl- will produce a soluble compound, as a result NOT a precipitate.
Which one of the following is NOT a characteristic of living things. *
Organized
Maintain certain internal conditions
Respond
Have feelings
Answer:
3
Explanation: