plz help me.....im new here
Answer:
Fe2S3
Explanation:
Answer:
Option 3rdFe2S3
Explanation:
As, the ionic valency of Iron (Fe) that is + 3 interchanges with the ionic valency of Sulphide that is - 2 to form-
Fe2S3
Lithium nitride LiN LiN3 Li3N
Answer:
Li3N
Explanation:
Lithium nitride is a compound with the formula Li₃N
Hope this helped!!!
Answer:
C
the next answer is B
the next one is C
Explanation:
How many moles of methane gas are required when there are 7.55 grams of oxygen gas available? Please someone explain how to solve this problem, I would really appreciate it.
Answer:
0.236 moles of methane gas are required when there are 7.55 grams of oxygen gas available.
Explanation:
The balanced reaction is
CH₄ + 2 O₂ → CO₂ + 2 H₂O
By reaction stoichiometry (that is, the ratio of reactants and products in the reaction), the following amounts of moles of each compound participate in the reaction:
CH₄: 1 mole O₂: 2 moles CO₂: 1 mole H₂O: 2 molesBeing the molar mass of each compound:
CH₄: 16 g/mole O₂: 32 g/moleCO₂: 44 g/mole H₂O: 18 g/moleThen, by reaction stoichiometry, the following mass amounts of each compound participate in the reaction:
CH₄: 1 moles* 16 g/mole= 16 gramsO₂: 2 moles* 32 g/mole= 64 gramsCO₂: 1 mole* 44 g/mole= 44 grams H₂O: 2 moles* 18 g/mole= 36 gramsSo, you can apply the following rule of three: if by reaction stoichiometry 64 grams of oxygen react with 2 moles of methane, 7.55 grams of oxygen react with how many moles of methane?
[tex]moles of methane=\frac{7.55 grams of oxygen*2 moles of methane}{64 grams of oxygen}[/tex]
moles of methane= 0.236
0.236 moles of methane gas are required when there are 7.55 grams of oxygen gas available.
what is the oceanic and continental crust made out of ?
Answer:
Oceanic crust is generally composed of dark-colored rocks called basalt and gabbro. It is thinner and denser than continental crust, which is made of light-colored rocks called andesite and granite. The low density of continental crust causes it to “float” high atop the viscous mantle, forming dry land.
Explanation:
why would a metal house not be a good idea in Florida or Alaska?
Answer: Maybe, It could be a good and bad idea.
Explanation:
This is beacuse Metal does not absorb and can block sunlight.
3. Components in a heterogeneous mixture are not in the same phase or the composition of the mixture is
a) uniform
b) transparent
c) uneven
4. Mixing sand and salt in water then passing it through a filter separates out the sand because salt
in water and sand does not.
a) reacts
b) dissolves
c) disappears
Answer:
c
Explanation:
what is the nature of salt which is formed by the combination of weak acid and strong base And have a great day ❤️
Raise the temperature of 2 g of water 2°C.
Answer:
This heat requirement we can calculate by following relationship..
Q = m*C*∆T
We have, m = 2gm, C = 1 cal/g-degC, ∆T = 2 degC
Putting all these values in above equation we get
Q= 2*1*2 = 4 cal
Help, please :)
What type of bond is being shown here?
A. Single covalent
B. Double covalent
C. Triple covalent
D. None
Answer:
Double bond, Double Covalent
Explanation:
Hope this helps!
mass of 12 helium atom
Which equation represents a fusion reaction?
Please answer asap
(Look at picture)
Answer:c
Explanation:
HELP ASAP!!!!
Identify each substance as a molecular compound or an
ionic compound, and then calculate its molar mass.
a. Sr(NO3)2
b. (NH)3PO4 C. C12H22O11
Answer:
a. ionic, 211.62g/mol
b. molecular, 149g/mol
c. molecular, 342g/mol
Explanation:
Ionic Compound: These are compounds (2 or more elements) where atoms of the element have lost or gained electrons, thus they are ions, thus the name ionic. An easy way to identify ionic compounds is to see if there are any metals. Metals tend to give up their electron to a non-metal. It maybe helpful to familiarize which parts of the periodic table have metals and non-metals.
Molecular Compounds: These are compounds (2 or more elements) that are neutral. An easy way to identify them is that the compound is made up of just non-metals.
Molar Mass is the masses of each individual element in the compound. Refer to the periodic table for the masses and add them up carefully, remember to multiply their mass based on how many molecules there are in the compound, like for a, we can find the mass of NO3, but we need to multiply it by 2 since we have 2 molecules of NO3.
a. Sr(NO3)2
Sr= 87.62
NO3= 14 + (3 x 16)= 62
Sr + 2 (NO3)
87.62 + (2 x 62)= 211.6
b. (NH4)3PO4
NH4= 14 + 4 = 18
PO4= 30.97 + (4 x 16)= 94.9
(NH4 x 3) + PO4
(18 x 3) + 94.9 = 149
c. C12H22O11
(12 x C) + (22 x H) + (11 x O)
(12 x 12) + (22 x 1) + (11 x 16)
144 + 22 + 176= 342
If you have 5 moles of carbon dioxide at 30degrees C and under 600mmHg of pressure, what will the volume be
Answer:
157.64 L
Explanation:
We'll begin by converting 30 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
T(°C) = 30 °C
T(K) = 30 °C + 273
T (K) = 303 K
Next, we shall convert 600 mmHg to atm. This can be obtained as follow:
760 mmHg = 1 atm
Therefore,
600 mmHg = 600 mmHg × 1 atm / 760 mmHg
600 mmHg = 0.789 atm
Finally, we shall determine the volume of the gas. This can be obtained as follow:
Number of mole (n) = 5 moles
Temperature (T) = 303 K
Pressure (P) = 0.789 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Volume (V) =?
PV = nRT
0.789 × V = 5 × 0.0821 × 303
0.789 × V = 124.3815
Divide both side by 0.789
V = 124.3815 / 0.789
V = 157.64 L
Therefore, the volume of the gas is 157.64 L
1. How is extinction different from mass extinction?
Answer:
Extinction is the elimination of one species whereas mass extinction results in multiple animals to become extinct.
Can someone help me plss
Answer:
the 3rd option is correct I promise
Explanation:
matter can not be created or destroyed no matter what, most important rule is chemistry
Calculate the [H3O+] of an aqueous solution that is 1.94 x 10-7 Min OH.
Enter your answer in scientific notation. Be sure to answer all parts.
_x 10^_M
What is the complete ionic equation for Hydrochloric acid and sodium hydroxide
Hydrochloric acid: HCl(aq)
Sodium hydroxide: NaOH(aq)
The two substances react in an acid-base neutralization reaction to produce aqueous sodium chloride and liquid water.
The complete ionic equation is:
H⁺(aq) + Cl⁻(aq) + Na⁺(aq) + OH⁻(aq) → Na⁺(aq) + Cl⁻(aq) + H₂O(l).
K/U_____ /13 T/I______/5
Knowledge and Understanding
1. Complete the following chart: [9 Marks]
Name (1 mark each)
Formula
Type of Compound (Ionic or Molecular) (1/2 mark each)
Diphosphorus Pentoxide
CBr4
Li2O
Silicon Dioxide
CH4 (Write the common name)
Manganese (III) Fluoride
Answer:
it shouuld be the third one down c
Explanation:
when pressure is kept constant then the temperature varies with volume
a. directly
b. inversely
c. none of these
d. both a and b.
Answer:
A
Explanation:
H2SO4 + 2 NaOH →
Na2SO4 + 2 H20
What mass of H2SO4 would be required to react with 2.25 mol of NaOH?
Answer:
110.25grams
Explanation:
The balanced chemical equation is as follows:
H2SO4 + 2NaOH → Na2SO4 + 2H20
Based on the balanced chemical equation of the reaction given above, 1 mole of sulphuric acid (H2SO4) is required to react with 2 moles of sodium hydroxide (NaOH).
Hence, if 1 mol of H2SO4 is needed to react with 2 moles of NaOH
Then, 2.25mol of NaOH will be required to react with;
= 2.25/2
= 1.125mol of H2SO4
Using the formula, mole = mass/molar mass, we can convert the molar value of H2SO4 to its mass value.
Molar mass of H2SO4 = 1(2) + 32 + 16(4)
= 2 + 32 + 64
= 34 + 64
= 98g/mol
Therefore, mole = mass/molar mass
1.125 = mass/98
mass = 98 × 1.125
mass = 110.25grams of H2SO4
Assuming that the trends continue, which of the following compound will have the greatest solubility at 120 ℃? The graph below shows the solubility of a variety of compounds.
A. Ce2(SO4)3
B. K2Cr2O7
C. NaCl
D. Pb(NO3)2
Answer:
its c
Explanation:
i took the test and got a 100
Assuming that the trends continue, sodium chloride compound will have the greatest solubility at 120 ℃.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
Learn more about solubility,here:
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The process of energy being captured
by plants from the sun and then
transferred from one organism to the
next in the food chain is called
A food flow
B energy flow
C nutrient flow
D water flow
Answer:
B
Explanation:
I am not sure but I think it is B. Out of all the answers that one makes sense.
A solution with a pOH level of 9.2 would be considered as a basic, acidic, or neutral.
Answer:
It would be Basic.
Explanation:
The higher the number, the more basic it is.
Answer:
its basic solution
Explanation:
b/c the pH value greater than7 base
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What is one definition of a base?
O A. A substance that increases the hydroxide ions in a solution
B. A substance that forms a salt when it dissolves in water
O C. A substance that stops the flow of electrons when dissolved
O D. A substance that makes the pH of a solution more acidic
Answer:
the answer is A
Explanation:
The base increases Hydroxide ions in a solution e.g NaOH
Answer:
A
Explanation:
density is the ratio of mass per unit volume. fact or bluff
Answer:
Fact
Explanation:
When 1 mol of Zn reacts with 0.8 mol of HCI, which of the following will be true?
Answer:
Zn is the excess reagent
Explanation:
what happens to halogens on going top to bottom in their group
they remain as they are and don't change their type
Now balance the chemical
reaction by providing the correct
whole number coefficients:

Answer:
2(C4H10)+13(O2)->8(CO2)+[](H20)
Explanation:
sorry i couldn’t get the last one
The chemical reaction by providing the correct whole number coefficients: number coefficients will be 2C4H10 + 13O2 WILL GIVE 8CO2 + 10H2O .this will be the balanced reaction.
What is the balanced reaction?Balance elements in the equation other than O and H. Balance the oxygen atoms by adding the appropriate number of water ( H 2O) molecules to the opposite side of the equation.
Balance the hydrogen atoms (including those added in step 2 to balance the oxygen atom) by adding H + ions to the opposite side of the equation.
When writing an equation for a chemical reaction, the two sides of the equation should balance and need the same number of each kind of element on both sides.
Therefore the given chemical equation is balanced in the following form, 2C4H10 + 13O2 WILL GIVE 8CO2 + 10H2O
Learn more about the balanced equation, here :
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A balloon has a volume of 5.0 L at a pressure of 0.863 atm. What is the volume of the balloon in
liters if the atmospheric pressure is reduced to 0.321 atm?
Answer:
V₂ = 13.44 L
Explanation:
Given that,
Initial volume, V₁ = 5 L
Initial pressure, P₁ = 0.863 atm
Final pressure, P₂ = 0.321 atm
We need to find the final volume of the balloon. The relation between the volume and pressure is given by :
[tex]P_1V_1=P_2V_2[/tex]
Where
V₂ is the volume of the balloon
So,
[tex]V_2=\dfrac{P_1V_1}{P_2}\\\\V_2=\dfrac{0.863 \times 5}{0.321 }\\\\V_2=13.44\ L[/tex]
So, the final volume of the balloon is equal to 13.44 L.
Plz help I need help plz