Answer:
The density of air goes down as you get higher with altitude.
Explanation:
Less air is pushing down on the molecules below it as you go up. This means that it is not as compacted, another word for which is dense.
The density of the air decreases with the increasing elevation (altitude).
What is altitude?Altitude is the height or distance measured in the up or vertical direction.
The higher the elevation, the less dense the air will be.
There are two reasons for this:
There is less air pushing down from above at higher altitudes, and gravity is weaker further away from the Earth's center.
As a result, air molecules may spread out more at higher altitudes, and air density drops.
Thus, As you go higher, the density of the air drops.
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what is the enthalpy of fusion of water?
a-
4.18 J/g*C
b-
0 Kelvins
c-
18.01 g/mol
d-
334 kJ/g
Answer:
d- 334 kJ/g.
Explanation:
You can detect it from the units of the different choices.
a- has the unit J/g.°C that is the unit of the specific heat capacity (c).
b- has the unit Kelvin that is the unit of temperature.
c- has the unit g/mol which is the unit of the molar mass.
d- has the unit kJ/g which is the unit of the enthalpy divided by the no. of rams that is the specific entha;py of fusion.
So, the right choice is: d- 334 kJ/g.
If the pressure of a sample of gas is doubled at constant temperature what happens to the volume of the gas
It will decrease the volume of gas.
The volume of the gas has decreased by 1/2.
( This is for science ) If part “d” of a wave is changed it changes the ____.
A. Amplitude
B. Wavelength
C. Frequency
D. Pitch
E. Volume
If part “c” of a wave is changed it changes the ____.
A. Amplitude
B. Wavelength
C. Frequency
D. Pitch
E. Volume
wavelength i think should be correct
Calculate the concentration of hydronium and hydroxide ions in a 0.050 M solution of nitric acid.
Answer:
[H₃O⁺] = 0.05 M & [OH⁻] = 2.0 x 10⁻¹³.
Explanation:
HNO₃ is completely ionized in water as:HNO₃ + H₂O → H₃O⁺ + NO₃⁻.
The concentration of hydronium ion is equal to the concentration of HNO₃:[H₃O⁺] = 0.05 M.
∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.
∴ [OH⁻] = 10⁻¹⁴/[H₃O⁺] = 10⁻¹⁴/0.05 = 2.0 x 10⁻¹³.
What volume of 0.0500 M NaOH solution is required to completely react with the HNO3
Answer:
50mL NaOH
This is the answer for edge
part 1: .0025
part 2: 50
part 3: .033
Answer: it's 50. also the answers that the other dude posted are correct for edg.
Explanation:
Which of the following happens during a chemical reaction?
a. Atoms of reactants are destroyed.
b. New atoms are created to form the products.
c. Atoms of reactants rearrange to form new substances.
d. The total mass of reactants is less than the total mass of products.
I think it's a but I'm not sure.
Answer: Option (c) is the correct answer.
Explanation:
A chemical reaction is defined as the reaction that leads to formation of new substances through exchange of electrons.
For example, [tex]2Al + 3CuCl_{2} \rightarrow 2AlCl_{3} + 3Cu[/tex]
Here, aluminium on displacing copper from copper chloride leads to the formation of a new compound, that is, aluminium chloride.
Hence, it shows that atoms of reactant molecules rearrange themselves to form new substances.
Thus, we can conclude that during a chemical reaction atoms of reactants rearrange to form new substances .
What volume would 20.0g of CO2 occupy at a temperature of 298k and a pressure of 105 kPa
1. u divide the mass 20.0g by its molar mass of 44.01g/mol = 0.454mol
2. using the formula PV=nRT
105kPa x V = 0.454mol (use the non rounded value) x 8.314Lkpa/molK x 298K
V= 10.7L :)
The volume that 20.0g of CO2 would occupy at a temperature of 298k and a pressure of 105 kPa is approximately 10.5 liters. The ideal gas law (PV=nRT) was used to calculate this.
Explanation:To answer this question, we would use the ideal gas law, which states that the pressure of a gas times its volume is equal to the number of moles of the gas times the gas constant times the temperature in Kelvin.
PV = nRT
You can think of it as the pressure and volume of a gas is directly proportional to its temperature and the number of particles (moles) of gas.
First, we need to find out how many moles of CO2 we have. We have 20.0 g of CO2, and the molar mass of CO2 is about 44 g/mol. So, we have: 20.0g / 44 g/mol = 0.455 moles of CO2
Next we plug this into the ideal gas law equation:
105 kPa * V = 0.455 moles * 8.31 J/(mol*K) * 298 K
Solving for V, we find that the volume is about 10.5 liters
So, 20.0 g of CO2 would occupy a volume of about 10.5 liters at a temperature of 298 K and a pressure of 105 kPa.
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How many atoms are in 4NH3
There are 4 N and 12 H so I think 16
There are 16 atoms in 4NH3
What is atom ?The smallest part of the matter is called atom .
An atom contains neutron, proton and electrons.
ExplanationIn the given question there is one molecule of NH3 , there is one Nitrogen atom and three hydrogen atom . So, for four molecule of NH3 there are four nitrogen atom and 4*3 hydrogen atom means twelve hydrogen atom.
So, total number of atoms in 4NH3 is 4+12 = 16
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Im stuck on these two problems
1st figure
answer
c)12
2nd
answer
c)28
#brianliest
The oxidation of magnesium to form magnesium oxide is shown by which balanced chemical equation?
A) Mg(s) + O2(g) → MgO(s)
B) 2Mg(s) + O2(g) → 2MgO(s)
C) 2MgO(s) → 2Mg(s) + O2(g)
D) 2Mg(s) → 2MgO(s) + O2(g)
magnesium oxide is: MgO (right side)
so the left side is: Mg + O2
for the equation to be balanced there must be two oxygens on both sides
Mg + O2 = 2MgO
but now the magnesium is uneven, so there must be two magnesiums on each side
the answer is: B) 2Mg + O2 = 2MgO
Answer : The correct balanced chemical reaction will be,
(B) [tex]2Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]
Explanation :
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.
If the amount of atoms of each type on the left and right sides of a reaction differs then to balance the equation by adding coefficient in the front of the elements or molecule or compound in the chemical equation.
Synthesis reaction : A chemical reaction where multiple substances or reactants combine to form a single product.
It is represented as,
[tex]X+Y\rightarrow XY[/tex]
The balanced chemical reaction will be,
[tex]2Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]
If a botanist wants to learn about a new method of crossbreeding orange trees so she can use the technique in her own experiments, what type of source should she use?
A. A secondary source, because it will include more data
B. A secondary source, because it is written by a scientist
C. A primary source, because it will contain more details
D. A primary source, because it will be easier to read
The answer is C a primary source
Answer: C. A primary source, because it will contain more details.
Explanation:
A primary source is the source which provides the first hand experience of an experiment, methodology, event and it considered to be authoritative, as it comes from the owner of the research piece. The primary source represents the thinking, discoveries and events which are original.
A secondary source includes the information which generates after the analysis, interpretation and evaluation of the information, or data from the primary source.
According to the given situation, as the botanist wants to learn about the new method of crossbreeding orange trees. The new method will be latest and may not be applied much by other scientist. Therefore, the source of information will be primary. It will contain more details.
What is the solubility of NH4Cl at 50°C?
A.
20 grams
B.
35 grams
C.
40 grams
D.
45 grams
E.
50 grams
The correct answer is E. 50 grams
The solubility of Ammonium Chloride has an increasing trend as the temperature increases. Experiments show that the solubility at 323K is approximately 50.4 grams per 100 grams o water thus this value is close to choice D, 50 grams
Answer: The correct answer is Option E.
Explanation:
Solubility is defined as the amount of substance (known as solute) which is dissolved in a unit volume of liquid substance (known as solvent) to produce a saturated solution at specific temperature and pressure. It is expressed in number of moles of solute present per 100 grams of solvent.
This property is directly dependent on temperature. As, the temperature increases, the solubility of the solute increases and vice-versa.
[tex]\text{Solubility}\propto \text{Temperature}[/tex]
[tex]NH_4Cl[/tex] is an ionic salt whose solubility increases as we increase the temperature.
The solubility of ammonium chloride at 50°C is 50 grams.
Hence, the correct answer is Option E.
How much does the earth weigh? How far away is the sun?
The Earth weighs, 5.972 × [tex]10^{24}[/tex] kg. For far away the sun is from the Earth is, 92.96 million mi.
Esterfication is what type of reaction?
A. Addition
B. Equilibrium
C. Combustion
D. Neutralization
Esterification is an B. Equilibrium reaction.
Answer: option B, Equilibrium
Explanation: Formation of ester by the reaction of Carboxylic acid and alcohol in the presence of mineral acids is called Esterification.
And entire reaction is a reversible and in equilibrium
A reverse reaction occurs on hydrolysis of Ester.
Hence Reactants and products are in equilibrium.
Example
CH3COOH+C2H5OH <------> CH3COOC2H5 +H2O
One property of water that makes it unique is its density. Which example describes a result of this property?
Polar bears float on ice floes to hunt for food.
Water's unique property of having lower density in its solid form allows ice to float on water. The orientation of hydrogen bonds during freezing causes water molecules to spread out, making ice less dense than liquid water. This unique property is vital for the survival of aquatic organisms in freezing conditions.
Explanation:One example of the unique density property of water is how ice floats on water. This is due to water's lower density in its solid form, a result of the way hydrogen bonds are oriented as water freezes: the water molecules are pushed farther apart compared to liquid water. This is different from most other liquids, where solidification involves an increase in density.
Thus, when water freezes, it expands and becomes less dense than its liquid form, causing ice to float on water. This provides an insulating layer, preserving the lives of aquatic organisms in freezing conditions. This is a feature unique to water and is a consequence of its abnormal density behavior.
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Beginning with commercial grade hydrochloric acid, 1.00 x 102 mL of a 12.4 M HCl is added to water to bring the total volume of the solution to 0.820L. What is the concentration of this new solution?
Answer:
New concentration = 1.512 M
Explanation:
Using the equation for dilution;
M1V1 = M2V2
M1 = 12.4 M , V1 = 100 mL or 0.1 L
M2 = ? , V2 = 0.820 L
Therefore;
M2 = M1V1/V2
= (12.4 × 0.1 )/(0.820L)
= 1.512 M
Children tend to resemble their parents in many ways; they may have like eye color, hair texture, height, or skin tone. This is because children inherit genes from both parents. A child receives 1/2 of his/her genes from the mother and the other half from the father. Genes are part of our DNA; our DNA makes up the chromosomes in our body and sex cells.
Sex cells or gametes are produced during the process of meiosis. Gametes have 1/2 the number of chromosomes as do regular body cells, like skin or muscle cells. When fertilization takes place, the two sets of alleles from the male gamete (sperm) and the female gamete (egg) are combined.
Many years ago, Gregor Mendel discovered that we have dominant and recessive traits that are determined by our genes. For examples, brown eyes are dominant over blue eyes. Scientists represent the gene for a trait with a letter: capital letter for dominant and lower case letter for recessive. A brown-eye person would have the genotype BB or Bb. A blue-eyes person would have the genotype bb. Whenever a dominant trait is combined with a recessive trait (Bb), the dominant trait most often masked the recessive trait.
Look at the grid above. This is called a Punnett square. It shows the genotypes of two parents and then the possible gametes that could be produced by each parent. We use the Punnett square to show the possible combinations of genes and the resulting traits. In this case, two black rats mate and their potential off-spring could be black (BB, Bb) or white (bb). The chances of having a black rat in this example is 3:4 or 75% and having a white rat is 1:4 or 25%.
Drag the labels to the correct locations within the Punnett square.
Black
Dominant gene
Phenotype
Recessive gene
White
black would be BB .
dominant gene is B.
phenotyope is where it says white fur.
recessive gene is b.
white is bb
The amount of matter that makes up an object is the object's (2 points)
A) weight
B) mass
C) density
D) force
The answer is B.
Hope this helped you!
B. mass is the correct answer
melting ice is an example of which of the following?
a-
endothermic reaction
b-
chemical reaction
c-
isothermic reaction
d-
exothermic reaction
{System:Hello beautiful user! The answer for this question is B-Chemical reaction. It’s chemical reaction because melting ice is being used my a natural chemical and it’s also a reaction from the natural chemical. I hope this helps you! •.•}
calculate the numbers of moles of krypton gas contained in a 5.00L container at 6.00 atm and 25.0 C if the gas is argon instead of krypton will the answer change
Answer:
n of krypton = 1.23 mol.
The no. of moles will not be changed, if the gas is either argon or krypton.
Explanation:
The no. of moles of a gas (n) can be calculated by the general gas law of ideal gases: PV = nRT,Where, P is the pressure of the gas in atm (P = 6.0 atm).
V is the volume of the gas container in L (V = 5.0 L).
n is the no. of moles of the gas.
R is the general gas constant (R = 0.082 L.atm/mol.K).
T is the temperature of the gas in K (T = 25.0°C + 273 = 298.0 K).
∴ n = PV/RT = (6.0 atm)(5.0 L)/(0.082 L.atm/mol.K)(298.0 K) = 1.228 mol = 1.23 mol.
The no. of moles will not be changed, if the gas is either argon or krypton because it does not depend on the type of the gas.
Explain how wind is connected to convection and radiation.
The earth’s atmosphere is heated through radiation by the sun. This means the wavelengths of the sunlight are absorbed by the molecules hence exciting them. When a mass of air is heated by radiation, it becomes less dense creating an area of low pressure. The air rises and cooler air mass moves in to replace the rising air. This is how winds are created.
How many grams of chloride ions are in 8.3 g of copper (II) chloride
[tex]4.4\; {\rm g}[/tex].
ExplanationRefer to a modern periodic table for relative atomic mass:
Cu- 63.546;Cl- 35.45.Formula of copper (II) chloride: CuCl₂.
Formula mass of copper (II) chloride:
63.546 + 2 × 35.45 = [tex]134.446\; {\rm g \cdot mol^{-1}}[/tex].
How many [tex]{\rm mol}[/tex] of formula units in 8.3 grams of CuCl₂?
[tex](8.3\; {\rm g}) / (134.446\; {\rm g \cdot mol^{-1}}) \approx 0.0617\; {\rm mol}[/tex]
Note the subscript "2" in the formula CuCl₂. There are [tex]2\; {\rm mol}[/tex] of chloride ions in every [tex]1\; {\rm mol}[/tex] formula unit of CuCl₂.
There would be [tex]2 \times 0.0617\; {\rm mol} \approx 0.123\; {\rm mol}[/tex] of [tex]{\rm Cl^{-}}[/tex] ions in [tex]0.0617\; {\rm mol}[/tex] formula units of CuCl₂.
The mass of [tex]1\; {\rm mol}[/tex] of chloride ion is 35.45 grams.
The mass of [tex]0.123\; {\rm mol}[/tex] of [tex]{\rm Cl^{-}}[/tex] ions will be [tex]35.45 \times 0.123 \approx 4.4\; {\rm g}[/tex].
Round the final value to two sig. fig. since the mass in the question is also 2 sig. fig.
She analyzed substance A and determines it is composed of sodium, oxygen, and hydrogen atoms in a ration of 1:1:1: what is substance A
Your answer would be sodium hydroxide.
Your compound is an ionic molecule, because of the positivity of sodium and the negativity of the OH.
In naming these, the name starts with the metal. In this case, it's sodium.
So we know it's sodium _____.
You're left with the OH. To combine them, it becomes hydroxide.
Therefore, you're left with sodium hydroxide.
Good luck!
The multiple paths in this circuit suggest that it is MOST LIKELY a
A) superconducting circuit.
B) single-Path circuit.
C) parallel circuit.
D) series circuit.
Answer:
c- parallel circuit
Explanation:
C
Circuits with multiple paths between the power source and devices are called parallel circuits.
12.47 g of ammonium nitrate are dissolved in water, then diluted to 250 ml. What is the molarity of the resulting solution?
= 0.6224 M
Explanation;Molarity is given by the formula;
Molarity = Number of moles/Volume
But moles = mass/Molar mass
Thus;
Moles = 12.47 g/80.043 g/mol
= 0.1556 Moles
Therefore;
Molarity = 0.1556 moles/0.25
= 0.6224 Mwhy should the numbers and types of atoms be the same on both sides of your chemical equation
The same number of atoms of each element must appear on both sides of a chemical equation. However, simply writing down the chemical formulas of reactants and products does not always result in equal numbers of atoms. You have to balance the equation to make the number of atoms equal on each side of an equation.
Balancing a chemical equation is crucial as it adheres to the law of conservation of mass, indicating the same number and types of atoms on both sides. This reflects the physical reality of chemical reactions, where mass and atom types are conserved, allowing for accurate predictions and understanding of reactions.
The requirement that the numbers and types of atoms be the same on both sides of a chemical equation is fundamental to the law of conservation of mass. This law states that mass cannot be created or destroyed in a chemical reaction. Therefore, a balanced chemical equation ensures that the same amount of each element is present on both sides of the equation, aligning with this universal law. To balance a chemical equation, coefficients are placed in front of the reactants or products to ensure that the number of atoms for each element is equal on both sides. This process does not involve changing the substances themselves but rather adjusting the quantities to reflect the conservation of atoms. For instance, if an equation starts with two hydrogen molecules reacting with one oxygen molecule to produce water, the balanced form would show that two water molecules are produced, maintaining the count of hydrogen and oxygen atoms. In practice, balancing a chemical equation not only obeys the law of conservation of mass but also ensures the equation accurately represents the physical reality of how substances interact and transform. This precision is crucial for predicting the outcomes of reactions, calculating reactant and product quantities, and understanding the molecular rearrangement during the reaction. Unbalanced equations, by contrast, imply that atoms are lost or gained, misrepresenting the reaction's nature.
calculate the molarity of 0.289 moles of FeC13 dissolved in 120 ml of solution
Answer:
2.41 M
Explanation:
The molarity is the moles of FeCl3 over the liters of solution. Since you're given mL you need to change it to L which is 0.12 L. 0.289 divided by 0.12 is your answer
Final answer:
The molarity of 0.289 moles of [tex]FeCl_3[/tex] dissolved in 120 mL of solution is 2.408 M.
Explanation:
To calculate the molarity (M) of a [tex]FeCl_3[/tex] solution, you use the formula:
[tex]M = \frac{moles of solute}{ liters of solution}[/tex]
In this case, we have 0.289 moles of [tex]FeCl_3[/tex] dissolved in 120 mL of solution. First, we must convert 120 mL to liters by dividing by 1000 (since there are 1000 mL in a liter), giving us 0.120 liters.
Now plugging the values into the molarity equation:
[tex]M = \frac{0.289 moles}{0.120 L} = 2.408 M[/tex]
Therefore, the molarity of the [tex]FeCl_3[/tex] solution is 2.408 M.
Which best describes what happens when a person sees red leaf
A. Human eyes reflect red light back to the leaf
B. The leaf absorbs res light from human eyes
C. Red light reflected from the leaf enters human eyes
D. The leaf radiates all colors of light except red to human eyes
How are igneous rocks classified
maybe centuries classified according to their chemical and mineral composition as felsic, intermediate, mafic, and ultramafic, and by texture or grain size
Explanation:
Igneous rocks -
These type of rocks are formed via the crystallization of the liquid , which is the molten rocks .
The categories of distribution of the igneous rock is -
1. Intrusive or the plutonic rocks .
2. Extrusive or volcanic rocks .
And the classification of Igneous rock is as follows -
1. felsic
2. mafic
Which of the following best describes plasma?
A - a group of supercooled particles with very low kinetic energy.
B - an ionized group of particles with low kinetic energy
C - a gas that becomes a solid without first becoming a liquid
D - an electrically charged gas with very high kinetic energy
The correct option is D.
Nowadays, scientists classified substances into four states of matter, which are: solid, liquid, gases and plasma. Plasma are hot ionized gas that is made up of equal number of positively and negatively charged ions. The ions in the plasma have very high kinetic energy which allow them to move around at high speed. Plasma is typically produce by heating gases to very high temperature.