Answer:
BaI2
Explanation:
can anyone do balance equation?
4 Cu2S
How many sulfur atoms are shown?
Answer:
there are 4 sulfur atom.
How many moles are in 8.5 x 1023 molecules of co?
1.4 mol CO
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
8.5 × 10²³ molecules CO
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 8.5 \cdot 10^{23} \ molecules \ CO(\frac{1 \ mol \ CO}{6.022 \cdot 10^{23} \ molecules \ CO})[/tex]Divide: [tex]\displaystyle 1.41149 \ mol \ CO[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
1.41149 mol CO ≈ 1.4 mol CO
3.15.8 cm3 of H2SO4 completely neutralised 20 cm3 of NaOH. The NaOH was 1.5 mol/dm3.
The equation is :
2NaOH + H2SO4 -----> Na2SO4 + H2O
Calculate the concentration of the of H2SO4.
Answer:
Molarity = 0.95 mol/dm³
Explanation:
Given data:
Volume of H₂SO₄ = 15.8 cm³
Volume of NaOH = 20 cm³
Concentration of NaOH = 1.5 mol/dm³
Concentration of H₂SO₄ = ?
Solution:
Chemical equation:
NaOH + H₂SO₄ → Na₂SO₄ + H₂O
First of all we will calculate the number of moles of NaOH and for that we will convert the units first,
Volume = 20 cm³/1000 = 0.02 L
Concentration of NaOH = 1.5 mol/dm³
1 mol/dm³ = 1 mol/L
Concentration of NaOH = 1.5 mol/L
Number of moles of NaOH:
Molarity = number of moles / volume in L
1.5 M = number of moles / 0.02 L
Number of moles = 1.5 M ×0.02 L
Number of moles = 0.03 mol
Now we will compare the moles of NaOH and H₂SO₄
NaOH : H₂SO₄
2 : 1
0.03 : 1/2×0.03 = 0.015 mol
Concentration of H₂SO₄:
Volume of H₂SO₄:
15.8 cm³/1000 = 0.0158 L
Molarity = number of moles / volume in L
Molarity = 0.015 mol / 0.0158 L
Molarity = 0.95 mol/L
1 mol/L = 1 mol/dm³
Molarity = 0.95 mol/dm³
Which bond consists of EQUAL sharing of electron pairs between two atoms?
A. Ionic
B. Polar covalent
C. Nonpolar covalent
Answer: Non-polar covalent bond
Explanation: If two atoms have no difference between their electronegativity charges, they will form nonpolar covalent bonds. This means that the electrons will be shared with the same intensity.
If they travel 75 meters in 10 seconds, how many meters must they travel each second?
1
What is me velocity
of this new graph?
me rummer roretsUTU Seconds
DIST
25
Answer:
Step-by-step explanation: We are asked to find the distance covered by a man in 15 minutes at a speed of 16 km/hr. 15 minutes = 15/60 hour. Therefore, the person can run 4 km in 15 minutes.
Explanation:
Which choice best describes a testable hypothesis?
A.) Carrots look better when given more water.
B.) Lilacs are better smelling than roses.
C.) Mountain lions travel over 100 km per day.
D.) The bacterium E. coli is worse than the bacterium S. aureus.
Answer:
A. carrots look better when given more water
plz help this is due today
Answer:
Explanation:
-
Hello there, I hope you are having a great day Your Question: Which is not an advantage of sexual reproduction? Would be A Diverse Offspring because some could be got to the mother or father carry are mixed together in the offspring.
PLEASEEEE HELP MEE!
ASAP WILL GIVE BRAINLIEST TO CORRECT ANSWER!!!!⇔ AND WILL GIVE A SHOUTOUT
Answer:
2nd option
Explanation:
What is the best description
of a mechanical wave?
A. A mechanical wave transfers energy through matter.
B. A mechanical wave transfers energy through empty
space.
C. A mechanical wave has many vibrations.
Answer: I think its A? im not completely sure though!!
Explanation:
which term refers to the condition that exists when no over all change in concentration results from diffusion?
a. concentration
b. osmosis
c. equilibrium
d. randomness
Answer:
a.cocentration es la respuesta
According to this balanced chemical equation,
what volume of C2H2 is required to form 40.0L
of CO2?
2C2H2(g) + 502(g) → 2H2O(g) + 4CO2(g)
A. 20.0L
B. 44.8L
C. 80.0L
D. 100 L
Answer: A. 20.0L
Explanation:
According to avogadro's law, equal moles of all gases occupy equal volumes at STP.
The given balanced equation is:
[tex]2C_2H_2(g)+5O_2(g)\rightarrow 2H_2O(g)+4CO_2(g)[/tex]
According to stoichiometry :
4 L of [tex]CO_2[/tex] is formed by = 2 L of [tex]C_2H_2[/tex]
Thus 40.0 L of [tex]CO_2[/tex] is formed by = [tex]\frac{2 L}{4L}\times 40.0L=20.0L[/tex] of [tex]C_2H_2[/tex]
Thus 20.0 L of [tex]C_2H_2[/tex] is required to form 40.0L of [tex]CO_2[/tex]
Answer:
Explanation:
can someone help me out here i can’t see the answer
Question 10
1 pts
Which of the following statements is true about the mass of an atom?
The mass is equal to the neutrons plus the valance electrons
The mass of an atom is equal to the protons plus the neutrons
O The mass is equal to the protons plus the electrons
The mass is equal to the mass of the protons plus the valence electrons
+ Previous
Next >
Answer:
The mass of an atom is equal to the protons plus the neutrons
The p_______ scale is a color coded scale that identifies acids and bases and neutral substances. Acids are 1-_____ and bases are 8-_____. Neutral substance are ____ like water.
Answer: The pH scale is a color coded scale that identifies acids and bases and neutral substances. Acids are 1-7 and bases are 8-14. Neutral substance are neutral like water.
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
The pH scale is a color coded scale that identifies acids and bases and neutral substances. The colours from yellow to red indicate an acidic solution, colours blue to violet indicate base and green colour indicates that a solution is neutral.
Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7. Thus pH scale range from 1 to 14.
Water is neutral with a pH of 7.
Can someone plz help me with this science
Answer:
The answer is A.
Explanation:
The answer is A because it is talking about a living organism.
Hope this helps! :)
What is the volume of a gas at 253K if the gas occupies 50.0 mL at a temp of 273K? Provided
pressure is held constant.
Answer:
V₂ = 46.34 mL
Explanation:
Given data:
Initial temperature = 273 K
Initial volume = 50.0 mL
Final temperature = 253 K
Final volume = ?
Solution:
The given problem will be solve through the Charles Law.
Charles Law
"The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure"
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
by putting values in formula,
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 50.0 mL × 253 K / 273 k
V₂ = 12650 mL.K / 273 K
V₂ = 46.34mL
What is H2O2????????
Answer:
Hydrogen Peroxide
Explanation:
Answer:
Hydrogen Peroxide
Hope this helps.
Explanation:
If a concentrated solution of acetic acid is 99.5 % HC 2 H 3 O 2 and has a density of 1.05 g/mL, what is the concentration of this acid in moles per litre?
The concentration of this acid in moles per litre : 17.41
Further explanationGiven
99.5% acetic acid
density=ρ=1.05 g/ml
Required
the concentration (mol/L)
Solution
99.5% dan density 1.05 g/ml (MW acetic acid = 60 g/mol)
[tex]\tt 99.5\%\times 1.05\dfrac{g}{ml}\times \dfrac{1000~ml}{L}=1044.75~g/L\\\\\dfrac{1044.75~g/L}{60~g/mol}=17.41~mol/L[/tex]
The relative number of atoms of a compound can be calculated
by dividing the percentage of an element by the:
Answer:
Obtain the relative numbers of atoms of each element in the compound by dividing the number of moles of each element in the 100 g sample by the number of moles of the element present in the smallest amount.
Answer:
Obtain the relative numbers of atoms of each element in the compound by dividing the number of moles of each element in the 100 g sample by the number of moles of the element present in the smallest amount.
10. Name an example of the cause for each of the following:
_a.physical weathering
b.chemical weathering
Answer:
Physical Weathering
Frost wedging. Frost wedging happens when water filling a crack freezes and expands (as it freezes, water expands 8 to 11% in volume over liquid water). ...
Heat/Cold Cycles. ...
Unloading
Explanation:
If there are 50 grams of a radioactive element how much will be present after 1,2, and 3 half lifes
Answer:
6.25
Explanation:
Which order is correct in listing the bond lengths from shortest to longest?
A. single, double, triple
B. triple, double, single
C. single, triple, double,
D. double, triple, single
Answer:
The triple bonds are the strongest and hence the shortest. Then comes double bonds which are of intermediate strength between the triple and single bonds. And finally the single bonds are weaker than the other two.
This way, Triple bonds are the shortest. Then comes double bonds. Finally, single bonds are the longest among the three.
The order of bond lengths is given as,
Triple bond < Double bond < Single bond
For which solutes dissolved in a liquid is the overall enthalpy of solution exothermic? A-some gases and most solids B- some solids and most gases C-few solids and few gases D- most solids and most gases
Answer:
B
Explanation:
Just took the test
Answer:
b
Explanation:
edge 2021
Can anyone help me with this?
Answer:
(a)
[tex]v = 10.1mL[/tex] --- Silicon
[tex]v = 9.0mL[/tex] --- Tin
[tex]v = 7.5mL[/tex] -- Lead
(b)
[tex]d = 1.55g/mL[/tex] --- Silicon
[tex]d = 5.56g/mL[/tex] --- Tin
[tex]d = 9.53g/mL[/tex] --- Lead
Explanation:
Given
The attached table
Solving (a): The volume of each sample
For each element, the volume (v) is calculated as:
[tex]v = v_f - v_i[/tex]
Where:
[tex]v_f = Final\ Volume[/tex]
[tex]v_i = Initial\ Volume[/tex]
So, we have:
Silicon:
[tex]v_f = 40.1mL;\ \ \ v_i = 30.0mL[/tex]
So, we have:
[tex]v = 40.1mL - 30.0mL[/tex]
[tex]v = 10.1mL[/tex]
Tin:
[tex]v_f = 29.0mL;\ \ \ v_i = 20.0mL[/tex]
So, we have:
[tex]v = 29.0mL - 20.0mL[/tex]
[tex]v = 9.0mL[/tex]
Lead:
[tex]v_f = 33.5mL;\ \ \ v_i = 26.0mL[/tex]
So, we have:
[tex]v = 33.5mL - 26.0mL[/tex]
[tex]v = 7.5mL[/tex]
Solving (b): The density of each sample
For each element, the density (d) is calculated as:
[tex]d = \frac{m}{v}[/tex]
Where
[tex]m = mass[/tex]
[tex]v = volume[/tex]
So, we have:
Silicon:
[tex]m = 15.70g[/tex]
[tex]v = 10.1mL[/tex] --- calculated in (a)
Density (d):
[tex]d = \frac{15.70g}{10.1mL}[/tex]
[tex]d = 1.55g/mL[/tex]
Tin:
[tex]m = 50.07g[/tex]
[tex]v = 9.0mL[/tex] --- calculated in (a)
Density (d):
[tex]d = \frac{50.07g}{9.0mL}[/tex]
[tex]d = 5.56g/mL[/tex]
Lead:
[tex]m = 71.47g[/tex]
[tex]v = 7.5mL[/tex] --- calculated in (a)
Density (d):
[tex]d = \frac{71.47g}{7.5mL}[/tex]
[tex]d = 9.53g/mL[/tex]
The Earth’s orbit _____.
causes day and night
is a circle
is an ellipse
goes around the moon
Answer:
The Earth's orbit is an ellipse.
Explanation:
The Earth's orbit is not a perfect circle. It is elliptical, or slightly oval-shaped.
Earth's Rotation causes day and night.
The Moon goes around Earth. The Earth goes around the sun.
yrup, USP, is prepared by dissolving 850 g of sucrose in sufficient purified water to make 1000 mL of syrup. Syrup has a specific gravity of 1.31. How many milliliters of water are used to prepare two liters of syrup?
Answer:
920mL of water
Explanation:
To solve this question we need to find as first the mass that must be added of water to make 1000mL of syrup using specific gravity. Thus, we can know the volume of water that mus be added:
1.31 is 1.31g/mL. In 1000mL = 1310g/1000mL. As the mass added of sucrose is 850g, the mass of water = Volume of water is:
1310g - 850g = 460g of water = 460mL to make 1L, To make 2L the amount of water that must be added is:
460mL * 2 =
920mL of waterThe number of milliliters of water are used to prepare two liters of syrup is 920 mL of water.
Given that,
USP, is prepared by dissolving 850 g of sucrose in sufficient purified water to make 1000 mL of syrup. The Syrup has a specific gravity of 1.31.Based on the above information, the calculation is as follows:
1.31 is = 1.31g/mL.
Now
In 1000mL = [tex]1310g \div 1000mL[/tex].
Now if the mass is added so the mass of water should be equivalent to the volume of the water.
= 1310g - 850g
= 460g of water
Now
= 460mL for 1L,
To make 2L the water should be
= 460mL (2)
= 920mL of water
Learn more: brainly.com/question/23334479
what would cause the liquid in the thermometer to drop?
2H2 + O2 2H2O
How many moles of water can be produced if 8 moles He are used?
a.2
b.4
c.8
d.16
Answer:
c ) 8
Explanation:
Given data:
Number of moles of water produced = ?
Moles of hydrogen react = 8 mol
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Now we will compare the moles of hydrogen and water.
H₂ : H₂O
2 : 2
8 : 8
Thus, 8 moles of water will produced.
65 grams of Potassium Chloride is dissolved to make 450 mL of solution. What is
the MOLARITY of this solution?
Can gravity be considered a force? Why or Why not?
i need evidence and a scientific reason
Answer:
Gravity is viewed as a force because it is a force. A force F is something that makes objects of mass m accelerate according to F=ma. ... Einstein explained this gravitational force, F=GMm/r2, as a consequence of the curved spacetime around the massive objects.
Explanation:
Gravity is viewed as a force because it is a force. A force F is something that makes objects of mass m accelerate according to F=ma. ... Einstein explained this gravitational force, F=GMm/r2, as a consequence of the curved spacetime around the massive objects.
