Answer:
%[tex]Al = 53.1%[/tex]%
%[tex]O = 46.9[/tex]%
Explanation:
If we know the grams of a chemical compound in a specific reaction, it is possible to know the percentage of each atom that composes it.
For the Aluminum Oxide in this problem, we know its total weight and the grams of each component.
therefore we can determine the percentage ratio of its components through:
For Al
%[tex]Al = \frac{mass of Al}{mass of Aluminium oxide} . 100[/tex]%
% [tex]Al = \frac{1,3 g}{2,45 g} . 100[/tex]%
%[tex]Al = 53.1%[/tex]%
In the same way for oxygen
%[tex]O = \frac{mass of O}{mass of Aluminium oxide} . 100[/tex]%
%[tex]O = \frac{1,5 g}{2,45 g} . 100[/tex]%
%[tex]O = 46.9[/tex]%
What substances devolve in water
Answer:
Two types of substances will dissolve in water: ionic compounds, such as sodium chloride (NaCl, or table salt) and compounds composed of larger molecules that have a net charge due to the arrangement of their atoms. Ammonia (NH3) is an example of the second type.
Explanation:
Answer:
sugar
salt
Explanation:
The temperature at which a solid melts is not characteristic if a compound nor an element
Answer:
False
Explanation:
The temperature at which a solid melts, known as its melting point is highly characteristic of a compound and element.
The melting point of pure substances, compounds and elements is definite and not varied.
Melting point is an intensive property of matter. It does not depend on the amount of matter present. It is an innate or intrinsic property of every matter. For example, no matter the volume or mass of water, it will always boil at 100°C, all things being equal.Therefore, melting point of most solids is characteristic of compounds and elements.
The melting point and freezing point of silver are 960 degrees celsius and 2162 degrees celsius, repectively. What is the freezing point?
Answer: 960 degrees celsius
Explanation:
The freezing point of silver is 960 degrees Celsius.
The melting point and freezing point of a pure substance are the same temperature, just described from different states of matter. When a substance transitions from solid to liquid, it is melting, and the temperature at which this occurs is called the melting point. Conversely, when a substance transitions from liquid to solid, it is freezing, and the temperature at which this occurs is called the freezing point. For silver, the temperature at which it melts (melting point) is 960 degrees Celsius, and this is also the temperature at which it freezes (freezing point). The value given for the freezing point in the question, 2162 degrees Celsius, is incorrect and is likely a typographical error. The correct freezing point of silver is 960 degrees Celsius.
Column A
Column B
1.
a. pH paper
b. Litmus paper
3.
only tells
you acid
or base
can tell
you the
pH
number
turns red
or blue
only
can turn
a variety
of colors
that
represent
different
pH
numbers
Answer:
a. pH paper can tell you the pH. pH paper only can turn a variety of colors that represent different pH numbers.
B. Litmus paper only tells you acid or base in order to turns red or blue color.
Explanation:
pH paper is a type of paper which is used for the identification of pH of the substance. On pH paper, colors are present which shows pH numbers of a solution while litmus paper is a type of paper which is used for the identification of solution whether it is acidic or basic. There are two colors i. e. Red and Blue. If the litmus paper turns red, the solution is acidic or if the litmus paper turns blue, the solution is alkaline or basic.
Write the formula for the following covalent compounds
1.) Carbon Dioxide.
2.) Sulfur Trioxide.
3.) Dinitrogen trioxide.
4.) Dinitrogen pentoxide.
5.) Phosphorus trichloride.
6.) Ammonia.
7.) Sulfur Hexachloride.
8.) Phosphorus Pentoxide.
9.) Carbon Tetrachloride.
10.) Silicon Dioxide.
11.) Carbon Disulfide.
12.) Phosphorus tribromide.
13.) I don't have notes on this one so I don't know.
14.) Aluminum Oxide.
15.) Dichloride Heptoxide. (Not 100% sure if that was a 2 or a 7 at the end.)
Hope this helps and sorry it took so long I had to search through my chemistry notes from awhile ago. But I tried as best I could. :)
Covalent compounds' formulas are represented with symbols for each element involved and subscript numbers indicating the quantity of each element. Lewis structures can be used to visualize the bonds formed by shared electrons. Hydrate ionic compounds have additional notation for water molecules in their formulas.
Explanation:The formula for covalent compounds is written using the symbols for each element involved, followed by subscript numbers to indicate the quantity of each element in the compound. For example, the compound composed of sulfur (S) and fluorine (F) is represented as SF₆, which shows that one sulfur atom is bonded with six fluorine atoms to form a molecule of this compound. Another example is N₂O₃, representing that two nitrogen (N) atoms and three oxygen (O) atoms are bonded together. Similarly, Cl₂O₇ indicates that two chlorine atoms bond with seven oxygen atoms to form this compound.
By using the Lewis structure, we can visualize how the atoms share electrons in order to form covalent bonds. When these molecules are formed, each atom shares its electrons with the others to create a stable connection, or bond, between them. The quantity of shared electrons is determined by the valence of each atom.
In terms of hydrate ionic compounds, the formula is written by adding a dot and the number of water molecules to the formula. For instance, if a compound includes water molecules, it will include a term such as '·2H₂O' included in the formula.
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How many iron ions are found in 10.9 molecules
Answer:
= 6.56 × 10²⁴ ions
Explanation:
We are given;
10.9 moles of Iron (iron doesn't exists as a molecules, so we can't have 10.9 molecules but we can have 10.9 moles)
We are required to determine the number of ions
We need to know that;
1 mole of iron = 6.022 × 10²³ ions
Therefore;
10.9 moles of iron will contain;
= 10.9 moles × 6.022 × 10²³ ions/mol
= 6.56 × 10²⁴ ions
Hence, 10.9 moles of iron contains 6.56 × 10²⁴ ions
Why might you only see a rainbow when rain is in front of you
Answer:
rain acts like a light prism which displays rainbow colors when light is shown through
Answer:
We see rainbow when the sun is behind us and and falling rain is in front of us
Explanation:
when sunlight strikes a falling drop of water it is retracted , changed indirection, by the surface of the water
What is the pressure in millimeters of mercury of 0.0105 mol m o l of helium gas with a volume of 223 mL m L at 50. ∘C ∘ C ? (Hint: You must convert each quantity into the correct units (L L , atm a t m , mol m o l , and K K ) before substituting into the ideal gas law.)
The pressure of helium gas in the given condition is 948.45 mm of Hg.
Explanation:
As per ideal gas law, the product of pressure and volume will be equal to the product of number of moles, gas constant and temperature of gas molecules. This is formed by the combination of three basic laws of kinetic theory of gases.
[tex]PV = nRT[/tex]
As the pressure P is unknown, but the volume V, temperature T and number of moles n is given for helium gas.
R = 8.314 J mol⁻¹ K⁻¹ = 62.363 mmHg L mol⁻¹ K⁻¹.
Then, pressure can be found as
[tex]P = \frac{nRT}{V}[/tex]
As T = 50°C = 50 + 273 K = 323 K and volume V = 223 mL = 0.223 L and n = 0.0105 mol
Then, [tex]P = \frac{0.0105*62.363*323}{0.223}=948.45 mm of Hg[/tex]
So, the pressure of helium gas in the given condition is 948.45 mm of Hg.
Describe the movement of particles in a solid substance as it is heated to its boiling point.
Answer:
in a solid particles or still but as it gets hot the particles will move around rapidly
As a solid heats to its boiling point, it undergoes phase changes from solid to liquid to gas. At each stage, the particles' movement changes from fixed vibrations to free movement. These changes occur at constant temperatures known as the substance's melting and boiling points.
Explanation:The movement of particles in a solid substance as it is heated to its boiling point involves different states of matter: the solid, liquid, and gas phases. In the solid phase, the particles of the substance are closely packed together and vibrate about fixed positions. As the temperature of the solid rises due to the heat, the vibrations of the particles increase. Upon reaching the melting point, the solid begins to transform into a liquid, a process known as melting.
The temperature remains constant during this phase transition until the entire solid has melted. In the liquid phase, the particles are not as closely packed as in a solid and can move more freely. As the temperature continues to rise, the liquid will eventually reach the boiling point, where it starts transforming into a gas in a process called vaporization. During this phase change, the temperature again remains constant until all the liquid has become a gas.
In the gas phase, the particles move most freely, colliding with each other and filling the available space. The behavior of these phase transitions is determined by the substance's unique melting and boiling points, which are affected by the environment's pressure. Phase changes also involve changes in the amount of heat in the substance, with heat absorbed during melting and vaporization, and released during condensation and freezing.
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What caused wind to blow
Answer:
Different atmospheric pressure. When there is a different atmospheric pressure, air moves from the higher pressure to the lower pressure area which results in what you call WIND but can result in various speeds and pressure.
Hope this helped and if it did, please give my answer a brainliest.
Answer:
Wind is caused by differences in the atmospheric pressure.
Explanation:
When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds of various speeds.
What happens to the volume of a gas in a closed container if the temperature increases, but the pressure remains the same? Why?
Answer:
Volume will goes to increase.
Explanation:
The given problem will be solve through the Charles Law.
According to this 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
So when the temperature goes to increase the volume of gas also increase. Higher temperature increase the kinetic energy and molecules move randomly every where in given space so volume increase.
Now we will put the suppose values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 4.5 L × 348 K / 298 k
V₂ = 1566 L.K / 298 K
V₂ = 5.3 L
Hence prove that volume increase by increasing the temperature.
Which of the following is an example of an organism that reproduces through mitosis?
A. human
B. tarantula
C. sunflower
D. bacterium
How do genes and chromosomes relate
COMPLETE
How many grams of CaCl2 are in 250 mL of 2.0 M CaCl2?
Answer:
There are 55, 49 g of CaCl2
Explanation:
We calculate the weight of 1 mol of CaCl2:
Weight CaCl2=Weight Ca + 2x(Weight Cl)= 40,08g+ 2x 35, 45g=110,98 g/mol
1000ml-----2 mol of CaCl2
250ml------x= (250 ml x 2 mol of CaCl2)/1000ml= 0,5 mol of CaCl2
1mol -----110,98g
0,5mol ---x= (0,5molx110,98g)/1 mol= 55,49 g
the compound benzamide has the following percent composition. What is the empirical formula? C=69.40% H=5.825% O=13.21% N=11.57%
Answer:
C7H7NO
Explanation:
The following were obtained from the question:
C = 69.40%
H = 5.825%
N = 11.57%
O = 13.21%
The empirical formula can be obtained as illustrated in the attached file
Which of the following statements is correct in regards to density?
Temperature is directly proportional to density.
Temperature and pressure do not affect density.
Pressure is directly proportional to density.
Pressure is inversely proportional to density.
Answer:
Pressure is directly proportional to the density of a substance.
Explanation:
Pressure is a measure of force per unit area. Density is defined as mass per unit volume i.e the ratio of mass of a substance to it's volume.
Thus, it means that an increase in pressure results in an increase in density and vice-versa.
Convert
375 m/s to ft/min
Answer:
73818.9
Explanation:
for an approximate result, multiply the speed value by 197
What is the molarity of 6 moles (mol) of NaCl dissolved in 2 L of water?
Answer: M = 3 M
Explanation: Molarity is the ratio between the number of moles per unit Liter of volume.
M = n / L
= 6 mole / 2 L
= 3 M
What kinds of elements form an ionic bond?
We have that For the Question"What kinds of elements form an ionic bond"
We see from the Definition that this kind of bond is formed b/w metals and non-metals
From the question we are told
What kinds of elements form an ionic bond
Generally
The Other Name for Ionic bond is covalent bond and it is formed when two ions of variant charge converge and this kind of bond is formed b/w metals and none metals
Therefore
For the Question
What kinds of elements form an ionic bond
We see from the Definition that this kind of bond is formed b/w metals and non-metals
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You just competed in a track meet and you run the 1500m race in 403 s. what was your average speed in miles per hour
Answer:
8.46mph
Explanation:
Given parameters:
Distance run = 1500m
Time taken to cover distance = 403s
Unknown:
Average speed in mph = ?
Solution:
The average speed of a travel is the rate of change of the total distance with time.
Speed is a scalar quantity that specifies magnitude of the travel but no direction.
Average speed = [tex]\frac{Total distance covered }{Time taken}[/tex]
we need to covered distance to miles from m and time in seconds to hours.
1609m = 1 mile
1500m = [tex]\frac{1500}{1609}[/tex] = 0.93miles
3600s = 1hr
403s = [tex]\frac{403}{3600}[/tex] = 0.11hr
Average speed = [tex]\frac{0.93}{0.11}[/tex] = 8.46miles per hour
what volume will 1.27 moles of helium gas occupy at stp
Answer:
28.45L
Explanation:
1mole of a gas occupy 22.4L at stp. This implies that 1mole of He also occupy 22.4L at stp.
Now if 1mole of He occupied 22.4L at stp, then, 1.27mol will occupy = 1.27x22.4 = 28.45L
Answer:
28.45L
Explanation:
2. Define and describe a mixture using examples.
A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs.
A mixture can usually be separated back into its original components. Some examples of mixtures are a tossed salad, salt water and a mixed bag of M&M's candy.
Nitrogen molecules rest with oxygen molecules. Nitrogen monoxide molecules are made.
N2 + O2 → 2NO
Nitrogen molecules and oxygen molecules react extremely slowly, even at 200°C.
The reaction between nitrogen
and oxygen becomes faster as both the temperature and the pressure increase. Explain why, using the reacting
particle model. (6 marks)
Answer:
At high temperature and pressure, reactions become faster
Explanation:
Collision theory or reaction particle model state that reacting particles must collide before reactions occur.
Reaction rate of reaction is dependent on the frequency of collision.
Kinetics of gases increases at higher temperature and pressure.
As the temperature and pressure of nitrogen and oxygen increased, they bound to move more faster, collide more frequently as to attain activation energy easily thereby increasing the reaction rate or making the reaction to complete faster.
Also at higher pressure, gaseous reactants are closer to each other.
5. What happens to the mass when you change
the volume?
It decreases
Explanation:If the mass of the object stays the same but the volume of the object decreases then its density becomes greater. If the volume of the object stays the same but the mass of the object increases then its density becomes greater.
74 calories to kilocalories
Answer:74 calories to kilocalories =0.074
Hope this helps
1. Which sample contains a total of 9.0 * 10 ^ 23 atoms ? A) 0.50 mole of HCI B) 0.75 mole of H 2 O C) 1.5 moles of Cu D) 1.5 moles of H 2
c. 1.5 moles of Cu will contain a total of 9.0 * 10 ^ 23 atoms.
Explanation:
To convert moles into atoms, the molar amount and number of atom is multiplied by Avagadro's number.
Avagadro's number is 6.022×[tex]10^{23}[/tex]
So applying the formula in the given sample:
A) 0.5×6.022×[tex]10^{23}[/tex]
3.01×[tex]10^{23}[/tex] atoms.
B) 0.75 mole of H20
O.75×6.022×[tex]10^{23}[/tex]
= 4.5166×[tex]10^{23}[/tex] atoms.
C) 1.5 moles of Cu
1.5×6.022×[tex]10^{23}[/tex]
= 9.033×[tex]10^{23}[/tex]
D). 1.5 moles of H2
1.5 × 2 × 6.022 × [tex]10^{23}[/tex]
= 18.066 × [tex]10^{23}[/tex] atoms because H2 is 2 moles of hydrogen.
Atom is the smallest entity of matter having property of the element to which it is a part.
The sample that contains 9.0 x [tex]10^2^3[/tex] atoms would be 1.5 moles of Cu.
1 mole of a substance contains 6.0 x [tex]10^2^3[/tex] atoms of the same substance. Thus:
0.50 mole of HCl would contain: 0.5 x 6.0 x [tex]10^2^3[/tex] = 3.0 x [tex]10^2^3[/tex] atoms.0.75 mole of H2O would contain: 0.75 x 6.0 x [tex]10^2^3[/tex] = 4.5 x [tex]10^2^3[/tex] atoms.1.5 moles of Cu contain: 1.5 x 6.0 x [tex]10^2^3[/tex] = 9.0 x [tex]10^2^3[/tex] atoms1.5 moles of H2 contain: 1.5 x 2 x 6.0 x [tex]10^2^3[/tex] = 18.0 x [tex]10^2^3[/tex] atomsHence, the only sample that contains 9.0 x [tex]10^2^3[/tex] atoms is 1.5 mole of Cu.
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How many moles of ammonium sulfate can be from the reaction of 30.0 mol of NH3 with H2SO4 according to the following equation: 2NH3+H2SO4=(NH4)2 SO4
Answer:
15 moles of ammonium sulfate would be formed from 30 moles of ammonia.
Explanation:
Given data:
Number of moles of ammonium sulfate formed = ?
Number of moles of ammonia = 30.0 mol
Solution:
Chemical equation:
2NH₃ + H₂SO₄ → (NH₄)₂SO₄
Now we will compare the moles of ammonium sulfate with ammonia.
NH₃ : (NH₄)₂SO₄
2 : 1
30.0 : 1/2×30.0 = 15.0 mol
So 15 moles of ammonium sulfate would be formed from 30 moles of ammonia.
Chemical reactions occur at the same rate no matter what the size of the reactant particles.
True or false?
Answer:
false
Explanation:
it can be differ when the concentration,surface area and when the rate of reaction is changed
Final answer:
The statement is false. Reaction rates are affected by the size of the reactant particles because smaller particles have a greater surface area, which increases the number of collisions and the rate of reaction.
Explanation:
The statement that chemical reactions occur at the same rate no matter what the size of the reactant particles is false.
The rate of a chemical reaction is influenced by various factors. One of these factors is the state of subdivision of the reactants, which pertains to the size of the reactant particles. A reaction between two reactants, for example, will often occur at a faster rate if one reactant is in the form of many small particles rather than one large lump. This is because many small particles have a greater surface area, leading to more collisions, which increases the reaction rate.
Other factors affecting the rate include the chemical nature of the reacting substances, temperature, concentration of the reactants, and the presence of a catalyst. Each of these can have a significant impact on how quickly a reaction proceeds.
What is the net ionic equation for Fe ( NO 3 ) 2 ( aq ) + Na 2 CO 3 ( aq ) ⟶ CaCO3 ( s ) + 2 NaNO 3 ( aq )
Answer:
Ca²⁺ (aq) + CO₃²⁻ (aq) ⟶ CaCO₃ (s)Explanation:
1. Write the balanced molecular equation(given):
Ca(NO₃)₂ (aq) + Na₂CO₃ (aq) ⟶ CaCO₃ (s) + 2NaNO₃ (aq)Notice that I replaced Fe(NO₃)₂ with Ca(NO₃)2 because Fe does not appear in the products.
2. Write the aqueous ionic compounds in form of ions:
Ca(NO₃)₂ (aq) ⟶ Ca²⁺ (aq) + 2NO₃⁻ (aq)Na₂CO₃ (aq) ⟶ 2Na⁺ + CO₃²⁻ (aq) 2NaNO₃ (aq) ⟶ 2Na⁺ (aq) + 2NO₃⁻ (aq)3. Write the overall ionic equation
In the balanced molecular molecular equation, substitute the ionic compounds with the corresponding ions:
Ca²⁺(aq) + 2NO₃⁻(aq) + 2Na⁺ (aq) + CO₃²⁻(aq) →
CaCO₃(s) + 2NO₃⁻(aq) + 2Na⁺(aq)
4. Write the net ionic equation
Remove the spectator ions (those that appear equal on both sides):
Ca²⁺ (aq) + CO₃²⁻ (aq) → CaCO₃ (s) ← answerWhat does nitrogen do to the soil
Answer:The chemical element will always get converted during the cycle as it enters different ecosystems. Nitrogen plays an important role as a nutrient in soils. It is needed for photosynthesis in plants. Nitrogen helps decomposers such as bacteria, worms
Explanation:
Answer Nitrogen is so vital because it is a major component of chlorophyll, the compound by which plants use sunlight energy to produce sugars from water and carbon dioxide (i.e., photosynthesis). It is also a major component of amino acids, the building blocks of proteins. Without proteins, plants wither and die.
Explanation: