Answer:
Warning means that it is getting smaller while crescent refers to the crurved shape simular to a banana or a boat. The warning crescent moon rises after midnight and is still up and visible in the morning and day sky before itsets in the afternoon.
Explanation:
2Al + 3H2SO4 → Al2(SO4)3 + 3H2 which are the following redox reaction.. For rach redox reaction identity the oxidizing agen and the reducing agent
Answer:
Oxiding agent - sulphuric acid (3H2SO4)Reducing agent - aluminium (Al)Explanation:
Oxiding agent act as "Reduction" which loses oxygen in the product side.
Reducing agent act as "Oxidation" which gains oxygen.
WHOSE Good with Chemistry to figure this question out?
Calculate the work in joules if the external pressure is 825 torr.
Remeber 1 L atm = 101.3 J
Answer:
[tex]\large \boxed{\text{220 J}}[/tex]
Explanation:
1. Convert the pressure to atmospheres
[tex]p = \text{825 Torr} \times \dfrac{\text{1 atm}}{\text{760 Torr}} = \text{1.086 atm}[/tex]
2. Calculate the work done
[tex]w = -p\Delta V = -p(V_{f} - V_{i}) = -\text{(1.086 atm)}(\text{2.0 L - 4.0 L})\\\\ = -\text{1.086 atm} \times \text{(-2.0 L)} = \text{2.17 L$\cdot$atm}[/tex]
3. Convert litre atmospheres to joules
[tex]w = \text{2.17 L$\cdot$atm} \times \dfrac{\text{101.3 J}}{\text{1 L$\cdot$atm}} = \textbf{220 J}\\\\\text{The work done is $\large \boxed{\textbf{220 J}}$}[/tex]
Note that the volume is decreasing, so work is being done on the system.
After spraying water on a waxed surface, a student notices that the water beads up to form many individual drops rather than being spread out evenly across the surface. What property of water causes it to bead up like this?
A.The high boiling point of water
B.The strong adhesion to other substances
C. The high density of liquid water
D.The ability to dissolve many other substances
E. The strong cohesion between water molecules
Answer:
B. The strong adhesion to other substances
Explanation:
hope this helps!
Answer:
E. The strong cohesion between water molecules
Explanation:
Water is a very special molecule because of its hydrogen bonds. And, because of these hydrogen bonds, water has many properties that make it unique compared to other substances.
One such property is that it is cohesive, which means water molecules are attracted to each other. This is due to the polar bonds and hydrogen bonds that water molecules have. Because of the polar and hydrogen bonds, the molecules attract each other and stick together, creating that bead-like phenomenon that the student sees on the table.
Thus, the answer is E.
The chart below describes the molecular motion in solids, liquids, gases, and plasma.
Solids Liquids Gases Plasma
slower than liquids, slower than solids but faster than solids faster than solids,
gases, and plasma faster than gases and but slower than liquids and gases
plasma plasma
The information in the chart about molecular motion is incorrect for:______
1. solids
2. liquids
3. gases
4. plasma
Answer:
Liquids
Note: the attachment below shows the properly arranged chart
Explanation:
The order of molecular motion of matter from fastest to slowest is;
Plasma>Gases>Liquids>Solids
Liquids move faster than solids not slower.
Answer:
liguids
Explanation:
what is 0.0000000012 in scientific notation
Answer:
1.2x10^9
Explanation:
You have to use a decimal point to count the zeros until you get to the one.
Explain in your own words what empirical evidence is.
If it takes 0.0393 L of oxygen gas kept in a cylinder under pressure to fill an evacuated 1.05 L reaction vessel in which the pressure is 0.980 atm, what was the initial pressure of the gas in the cylinder
Answer:
26.2 atm
Explanation:
P1=P2V2/V1
P1=(1.05 x .980)/.0393
Answer: 26.2 atm
You can check this by knowing that P and V at constant T have an inverse relationship. Hence, this is correct.
what is a respiration?
Answer:
Respiration is the biochemical process in which the cells of an organism obtain energy by combining oxygen and glucose, resulting in the release of carbon dioxide, water, and ATP (the currency of energy in cells)
Explanation:
How many miles of glucose are in 19.1 g of glucose
Answer:
did you mean moles? If so, answer is down below.
Explanation:
there are 0.106 moles of glucose in 19.1 g of glucose.
How many moles would needed to be dissolved in 1 dm3 to get a 3M solution? How many would be needed if only 0.1 dm3 were used?
ILL ALSO GIVE BRAINLIST
Answer:
I dm u on Instagram
Explanation:
Check messages
According to molar concentration, 3 moles are needed to be dissolved in 1 dm³ to get a 3 M solution,and 0.3 moles would be needed if only 0.1 dm³were used.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substituting the values in given formula, number of moles=molar concentration×volume in liters=3×1=3 moles and for 0.1 dm³ it is 3×0.1=0.3 dm³.
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weather balloon is filled with helium to a volume of 340 L at 30 ∘C and 751 mmHg . The balloon ascends to an altitude where the pressure is 495 mmHg and the temperature is -27 ∘C.What is the volume of the balloon at this altitude?
Answer: Thus the volume of the balloon at this altitude is 419 L
Explanation:
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 751 mm Hg
[tex]P_2[/tex] = final pressure of gas = 495 mm Hg
[tex]V_1[/tex] = initial volume of gas = 340 L
[tex]V_2[/tex] = final volume of gas = ?
[tex]T_1[/tex] = initial temperature of gas = [tex]30^oC=273+30=303K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]-27^oC=273-27=246K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{751\times 340}{303}=\frac{495\times V_2}{246}[/tex]
[tex]V_2=419L[/tex]
Thus the volume of the balloon at this altitude is 419 L
Fatty foods become rancid due to the process of
Answer:
Fatty foods become rancid due to the process of rancidity
PH questions answer both please
Answer:
1. a, 1.66
2. c, 1.69
Explanation:
-log(H+)=pH
pH+pOH=14
Use your Cabbage pH Indicator Key to determine the pH of each. Enter the pH ranges into the data table.
Answer: pH :1-2 / acid
pH:7/neutral
pH:8-9/basic
Your welcome
Answer:1-2,7, 8-9
Explanation:
Acidic, neutral, basic
give the systematic name for the following compound
Answer:
2,4–dimethylhexane.
Explanation:
To name the above compound, we must do the following:
1. Locate the longest continuous carbon chain. This gives the parent name. In this case, the longest chain is carbon 6 i.e Hexane.
2. Identify and Locate the position of the substituent group attached. In this case, the substituent group attached is methyl i.e CH3 and it is at carbon 2 and 4.
3. Combine the above to get the name.
Therefore, the name of the compound is:
2,4–dimethylhexane.
Calculate AGrxn for this equation, rounding your
answer to the nearest whole number.
CaCO3(s)– Cao(s) + CO2(g)
AGf.Cacoa = -1,128.76 kJ/mol
AGf, Cao = -604.17 kJ/mol
AGT,CO, = -394.4 kJ/mol
AGrx = what
Answer: [tex]\Delta G_{rxn}=130.19J[/tex]
Explanation:
The balanced chemical reaction is,
[tex]CaCO_3(s)\rightarrow CaO(s)+CO_2(g)[/tex]
The expression for Gibbs free energy change is,
[tex]\Delta G_{rxn}=\sum [n\times \Delta G_(product)]-\sum [n\times \Delta G_(reactant)][/tex]
[tex]\Delta G_{rxn}=[(n_{CO_2}\times \Delta G_{CO_2})+(n_{CaO}\times \Delta G_{CaO})]-[(n_{CaCO_3}\times \Delta G_{CaCO_3})][/tex]
where,
n = number of moles
Now put all the given values in this expression, we get
[tex]\Delta G_{rxn}=[(1\times -394.4)+(1\times -604.17)]-[(1\times -1128.76)][/tex]
[tex]\Delta G_{rxn}=130.19J[/tex]
Therefore, the gibbs free energy for this reaction is, +130.19 kJ
Answer: 130 kJ
Explanation:
the volume, in liters, occupied by 2.50 moles of N2 gas.
calculate at STP
Answer: The volume occupied by 2.50 moles of [tex]N_2[/tex] gas at STP is 56.0L
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 1 atm (at STP)
V = Volume of gas = ?
n = number of moles = 2.50
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]273K[/tex] (at STP)
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{2.50mol\times 0.0821Latm/K mol\times 273K}{1atm}=56.0L[/tex]
Thus the volume occupied by 2.50 moles of [tex]N_2[/tex] gas at STP is 56.0L
In 1909, Ernest Rutherford performed an experiment to explore the atomic structure. In his experiment, he projected high-speed α particles onto a thin gold foil. He found that all α particles did not follow the same path. Most of the particles passed through the foil without any scattering, implying that most of the space in an atom is empty. Some particles were scattered at a large angle, and very few of them scattered back in the direction from which they had come. Based on these observations, Rutherford proposed an atomic model, which is known as Rutherford’s atomic model.
O True
O False
Answer:
True
Explanation:
In 1909 Ernest Rutherford proposed to Geiger and Marsden to conduct an experiment in which they would have to launch alpha particles from a radioactive source against a gold foil a few atoms thick.
The aim of the experiment was to corroborate Rutherford's idea that the particles would pass through the metal foil with little deviation.
Rutherford's interpretation of the experimental results gave rise to a new atomic model, and concluded that the mass of the atom was concentrated in a small region of positive charges that impeded the passage of alpha particles. He suggested a new model in which the atom had a nucleus or center in which the mass and the positive charge are concentrated, and that in the extra nuclear zone are the negatively charged electrons.
How many atoms are in 4Ca3(PO4)2
Answer:
52
I personally don't know how to do this but this is what I was told the answer is
There are 22 atoms in calcium phosphate with chemical formula 4 Ca₃(PO₄)₂ .
To determine the number of atoms in a chemical formula, one need to multiply the number of atoms for each element by the corresponding subscript and then sum them up.
In the given chemical formula, 4 Ca₃(PO₄)₂, :
- 4 is the coefficient in front, indicating that the entire compound is multiplied by 4.
- Ca represents calcium, and the subscript 3 indicates there are 3 calcium atoms.
- (PO₄)₂ represents a group called a phosphate group. Within the phosphate group, we have 1 phosphorus atom (P) and 4 oxygen atoms (O). The subscript 2 outside the parentheses indicates that the entire phosphate group is multiplied by 2.
To calculate the total number of atoms, we multiply the coefficients by the subscripts and sum them up:for calcium (Ca):
3 calcium atoms × 4 = 12 calcium atoms
For phosphate:
1 phosphorus atom ×2 = 2 phosphorus atoms
4 oxygen atoms ×2 = 8 oxygen atoms
Adding up the totals:
12 calcium atoms + 2 phosphorus atoms + 8 oxygen atoms = 22 atoms
Therefore, there are 22 atoms in 4 Ca₃(PO₄)₂.
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what is 2H2O state of matter
Answer:
2 MOLECULES OF WATER
Explanation:
SO, LIQUID
CTION REVIEW
a. What are five general properties of aqueous
acids?
Compared to an enzyme with a Km of 10-6 mM, an enzyme having a Km of 10-8 mM
A. would have 100 times more product formed per min
B. would be described as having binding more tightly to the substrate
C. would be described as having a significantly lower affinity for the substrate
D. would have a Vmax 100 times larger
E. would have identical values for Vmax
Answer:
The correct answer is option B - would be described as having binding more tightly to the substrateExplanation:
Compared to an enzyme with a Km of 10-6 mM, an enzyme having a Km of 10-8 mM
The correct answer is option B - would be described as having binding more tightly to the substrate
Reason:
Km is the measure of substrate affinity. It is inversely proportional. Higher the Km, lower is the binding affinity of the enzyme and lower the Km, higher binding affinity of the enzyme to the substrate.
Therfore, Km of 10⁻⁸ will have higher substrate binding affinity than the 10⁻⁶ enzyme.
What is the relationship between heat, temperature, thermal
energy within a system?
Answer:
The thermal energy, orheat, of an object is obtained by adding up the kinetic energy of all the molecules within it.Temperature is the average kineticenergy of the molecules.
If 11.5 ml of vinegar sample (d=1g/ml) is titrated with 18.5 ml of standardized Sodium hydroxide
solution. What is the molarity of acetic acid in vinegar sample ?
Answer:
10.35 M
Explanation:
Molarity = moles solute/ L solution
18.5 mL = 0.0185 L solution
11.5 mL (1g/1mL)= 11.5 grams vinegar (1 mol / 60.052 grams) = 0.1915 mol vinegar
M = 0.1915 mol vinegar/ 0.0185 L solution = 10.35M
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Which statements about fossils are true? Check all that apply.
They give clues about Earth's climate in the ancient past.
Only animals can become fossils.
Fossils show what Earth was like millions of years ago.
Fossils can be found in ice.
The best fossils are preserved in tar.
Statements about fossils are true -
They give clues about Earth's climate in the ancient past.Fossils show what Earth was like millions of years ago.Fossils can be found in ice.The remains or traces of ancient living organisms that have been preserved by natural processes, known as Fossils. These are of many types of parts and some are whole preserved organisms, some are impressions, while others are mold.
help to study the evolutionary story.dinosaurs and mammoths are organisms known due to fossils only, so fossil evidence shows that the earth has changed over time and the ancient past changed as well.Radiometric dating of fossils helps know the chronological evolutionary history.Fossils can be preserved in blocks of ice for example woolly mammoths went extinct 10,000 years ago, have been found in ice.Thus, Statements about fossils are true -
They give clues about Earth's climate in the ancient past.Fossils show what Earth was like millions of years ago.Fossils can be found in ice.Learn more about:
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Hi i really need help ASAP
Neon in a piston is compressed to a volume of 11 L. Its original volume was 21 L at 11.1 atm. Find the new pressure in atm. Describe what is happening to the gas.
Answer:
The new pressure is 21.19 atm.
Explanation:
Original volume of the gas was 21 L at 11.1 atm
Neon in a piston is compressed to a volume of 11 L.
It is required to find the new pressure in atm. Boyle's law gives the relationship between volume and pressure. Its mathematical form is given by :
[tex]P_1V_1=P_2V_2[/tex]
We have,
[tex]P_1=11.1\ atm\\\\V_1=21\ L\\\\V_2=11\ L\\\\P_2=?[/tex]
Using above equation,
[tex]P_2=\dfrac{P_1V_1}{V_2}\\\\P_2=\dfrac{11.1\times 21}{11}\\\\P_2=21.19\ atm[/tex]
So, the new pressure is 21.19 atm.
what was the open-range system
Answer: In the Western United States and Canada, open range is rangeland where cattle roam freely regardless of land ownership. ... Land in open range that is designated as part of a "herd district" reverses liabilities, requiring an animal's owner to fence it in or otherwise keep it on the person's own property.
Explanation: Mark me as brainliest
a. what mass of chromium would be produced from the reaction of 57.0 g of potassium with 199 g of chromium (ii) bromide according to the following reaction?
b. which reactant is in excess and how many grams of this reactant are left over ?
2k + CrBr2 -> 2kbr + cr
Answer:
2 K + 1 CrBr2 yield 2 KBr + 1 Cr
Explanation:
Henry divides 1,060 g by 1.0 ml to find the density of his water sample. How many significant figures should be included in the density value that he reports?
Answer:
Explanation:
1060 grams / 1.0 ml = 1060 g/ml ≅ 1100 g/ml (final answer has 2 sig. figs.
Answer:
Final answer => 1100 (2 sig. figs.)
Explanation:
1060 grams / 1.0 ml = 1060 g/ml ≅ 1100 g/ml (final answer).
The rule is, the final answer of the calculation should have answer rounded to the data value having the least number of significant figures of the data used in the calculation. That is to the data value having the least number of significant figures.
Counting Significant Figures (a method of determining no. of sig. figs.).
For data values without decimal in data value, count left to right until reaching 1st nonzero digit. Begin count, include all zeros after 1st zero as enclosed zeros as significant figures.
Present final results with the least number of sig. figs. as defined by data of computations.
Examples: data values without decimal. Count right to left.
12000 => 2 sig. figs. (trailing zeros are not sig. figs)
2051000 => 4 sig. figs.
300 => 1 sig. fig.
93000000 => 2 sig. fig.
Examples: data values containing decimal. Count left to right.
0.0012 => 4 sig. figs. (leading zeros are sig. figs.)
12.0035 => 6 sig. figs. (enclosed zeros are sig. figs.)
0.000001 => 6 sig. figs. (leading zeros are sig. figs.)
13.010 => 5 sig. figs. (enclosed zeros are sig. figs.)
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What is a paragraph to fit this
Answer:
They add carbon Dioxide into the air warming the atmosphere which adds to the greenhouse effect, Making the temperature higher