show the shape and appearance of the arrangement of atoms in a compound.
HELP FOR MY FINAL PLEASE PLEASE
For average speed, we divide the total distance covered by the total time taken.
After doing that, you will see that Jane has the lowest average speed.
How many grams of iron (III) oxide are needed?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Iron(III) Oxide, or 159.6882 grams.
07
This question is about elements.
Caesium is in Group 1 of the periodic table.
0 7
1
Explain what happens to caesium atoms and to oxygen atoms when caesium reacts
with oxygen to produce caesium oxide.
You should answer in terms of electrons.
[4 marks]
Answer:
Caesium will lose an electron and oxygen will gain an electron
The caecum is a chemical element of atomic number 55 and is a soft and golden alkali metal.
The electrons are transformed from the alkali metal to the oxygen meta that results in distinctions. They both combine to form a network of compounds with a distinct pattern. The cerium oxide is an inorganic compound of oxygen and the cesium reaction of both will form the ionic compound.Learn more about the about elements, cesium is of the periodic table.
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What type of circuit does this figure represent?
parallel circuit
series circuit
short circuit
open circuit
Two lengths of wire connect opposite sides of a battery to contacts on opposite sides of lightbulb one, then lightbulb two, and then lightbulb three.
HELP NOWWWWWWW I WILL MARK BRANILEST!!
Answer:you answer would be B
Explanation:and I'm bc I took the rest lol
Parellel Curcuit Explanation: I took the Test On k12
7
What might cause a theory to change over time?
A
New laws passed by the government
B
New but untestable Ideas
C Changes in public opinion
D
The discovery of new evidence
Answer:
D. The discovery of new evidence.
D is correct because it's the only one that would give proof and science relies on proof.
Complete the following chemical formula and determine the final molarity of NaCl:
__ BaCl2(aq) + __ Na2SO4(aq) --> ____ + _____
You react 45g BaCl2 with an excess of Na2SO4 in 250mL of water. Find the molarity of NaCl produced.
A. 0.25
B. 0.58
C. 1.72
D. 3.82
Answer:
[NaCl] = 1.72 M
Explanation:
First of all, we balance the equation:
BaCl₂ + Na₂SO₄ → 2NaCl + BaSO₄
We convert mass of barium chloride to moles
45 g . 1mol / 208.23g = 0.216 moles
Ratio is 1:2. This means, that our moles of reactant may produce the double of moles, of product.
0.216 . 2 = 0.432 moles of NaCl are been produced.
Molarity is mol/L. We convert volume of water from mL to L
250 mL . 1L /1000 mL = 0.250 L
[NaCl] = 0.432 mol/0.250L = 1.72 M
mention three properties of alloys
5 difference between Ionic compound and covalent compounds in tabular form
1. Ionic compounds are formed by the transfer of electrons that are positively and negatively charged, whereas, covalent compounds are formed by sharing the electrons. 2. In an ionic compound, bonding involves a metal and nonmetal, whereas, in the covalent compound, bonding is between nonmetals.
You want to sweeten a cup of tea, and you have three types of sugar: sugar cubes (volume: 5ml), granulated sugar (volume: 0.1 ml), and powdered sugar (volume: 0.0001 ml). Which sugar would dissolve the fastest? Why?
Answer:
powdered sugar
Explanation:
The higher is the exposed area of sugar, the faster is the dissolution process. Thus, to choose between the different types of sugar, we have to look at the volume occupied by the sugar.
In sugar cubes, the particles of sugar as compacted in a cube, so the particles inside the cube are not exposed to the solvent (water). So, sugar cubes have the slowest dissolution process. Then, in granulated sugar, the particles have more area exposed, so this type of sugar will dissolve faster than sugar cubes. Finally, powdered sugar is composed of tiny particles with more are exposed, so powdered sugar has the fastest dissolution process.
Therefore, powdered sugar will dissolve the fastest.
lead can react with oxygen gas. If lead (IV) oxide is the product of the reaction, how would the reaction be classified
Answer:
this reaction is an oxidation reaction
The chemical reactions involving both oxidation and reduction are known as redox reactions. The oxidation involves the loss of electrons. The reaction of lead with oxygen is an example of oxidation reaction.
What is oxidation reaction?According to the classical concept, oxidation is defined as a process which involves the addition of oxygen or electronegative element or the removal of hydrogen or electropositive element.
During electron transfer, the species which loses electrons is said to be oxidized and the species which gains electrons is said to be reduced.
The lead (IV) oxide is the formula of PbO₂. Here the oxidation state of lead is +4. The lead (IV) oxide is used in manufacturing dyes and also used to make explosives. It is a corrosive outcome that can evolve in lead pipes that are used for drinking water.
The formation of lead (IV) oxide is given as:
Pb (s) + O₂ (g) → PbO₂ (g)
Thus the reaction is an oxidation reaction.
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which element is extracted from bauxide ore
Record your evidence about the Moon's appearance
changing because the position of the Moon changes.
Help please…
Answer:
A solar eclipse .
It is one that occurs when the moon gets between the Earth and the Sun and it casts its shadow over the Earth. A solar eclipse only happens during the phase of new moon when the moon is indirect blockage of sun rays from reaching the earth thus causing a full shadow of the moon to fall on the Earth’s surface.
2 A lunar eclipse can only occur when there is a full moon. An eclipse of the moon happens only at full moon and only when the moon passes through some portion of the Earth’s shadow. The shadow in made of a two cone-shaped components, one which is nested inside the other.
3. Earth blocks sunlight from reaching the moon's surface. There are three categories of lunar eclipse according to the blockage of the sun rays. In a penumbral lunar eclipse, the moon passes through Earth’s penumbral shadow. The partial lunar eclipse occurs when a portion of the moon passes through Earth’s umbral shadow. The total lunar eclipse happens when the entire moon passes through Earth’s umbral shadow.
4.When an object in space comes between the sun and earth. It is one that occurs when the moon gets between the Earth and the Sun and it casts its shadow over the Earth. A solar eclipse only happens during the phase of new moon when the moon is indirect blockage of sun rays from reaching the earth thus causing a full shadow of the moon to fall on the Earth’s surface.
5.A total lunar eclipse. In this type of lunar eclipse, the events are clearly visible and striking to view because the Moon surface appear red in color. During the occurrence of the lunar eclipse events, 35% of the entire eclipse is total eclipse.
6. Wide, dark areas and strange spots and ridges –Galileo described the surface of the moon as being uneven and rough. In addition to that, he described the surface as crowded with depressions and bulges. In his original sketches, the long shadows cast by craters were represented by dark sided of the moon sketch.
7. Waxing gibbous .During the cycle of the moon, it undergoes several phases; new moon-new crescent-first quarter-waxing gibbous-full moon-waning gibbous-last quarter-old crescent-new moon. The new moon phase cannot be seen because the part receiving sun rays in then pointed away from the earth. The rest of the phases are visible from the earth.
8. New moon .
During the cycle of the moon, it undergoes several phases; new moon-new crescent-first quarter-waxing gibbous-full moon-waning gibbous-last quarter-old crescent-new moon. The new moon phase cannot be seen because the part receiving sun rays in then pointed away from the earth. The rest of the phases are visible from the earth.
9. Because the Southern Hemisphere has more direct sunlight .During the winter months, the Northern Hemisphere is tilted away from the sun, thus it receive sunrays at an angle thus it experiences the cold weather. At this period, it is summer in the Southern Hemisphere.
Explanation:
The moon is the earth's closed satellite and it gets light from the sun. The moon has several phases that are seen within 27 days cycle.
There are 6-7 phases of the moon that is the new moon, the first quarter, the full moon, secondary phases like the waning and waxing crescent, the waxing and waning gibbous. The new moon starts with the moon coming in between the sun and the earth. Then comes the waning crescent phase between the new moon and the quarter. The first quarter is a half-moon, 90 degrees east of the sun. The waxing gibbous is between the first quarter and full moon. The full is when sun illumination is 100% and again waning gibbous descends back to last quarter or the 3rd quarter.Hence as the earth changes its position the moon also revolves in a similar manner.
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When the temperature 20 degrees celsius (c),what is it on the Fahrenheit (f)scale??/r/nUse the formula f=(9/5xC)+32
Given :
Temperature in Celsius is 20 degree.
To Find :
The value of same temperature in Fahrenheit.
Solution :
It is given that temperature in Fahrenheit can be found by :
[tex]F = \dfrac{9}{5}C + 32[/tex]
Putting value of C = 20 in above equation, we get :
[tex]F = \dfrac{9}{5}\times 20 + 32\\\\F = 68 \ F[/tex]
Therefore, the value in Fahrenheit is 68 F .
The bathroom mirror has water droplets on it after a hot shower. choose the correct phase change. HELPP
Answer:
what?
Explanation:
what the hell?
help help help help help help
Answer:
d) Hypothesis
Explanation:
I think d) Hypothesis is the correct answer for the question.
Hope it helps :)
H_ _t
tis produced from many kinds of fuel. It travels from an area of higher temperature to an area of lower temperature
HELPPPPPP!!!! SHOW WORK
Calculate the pressure exerted by heels of a 100 lb woman in high heels, if the area beneath the heel of each shoe is 0.25 square inch
Answer:
P = 400 Lb/in²
Explanation:
We are given;
Weight of woman; W = 100 lb
Area beneath heel of shoe; 0.25 in²
Now, we want to find pressure.
Formula is;
P = F/A
Where;
F is force exerted by the object which is equal to weight of the object
A is area covered by object
Thus;
P = 100/0.25
P = 400 Lb/in²
Which of these statements is true about the two graphed parallelograms?
Answer:
They are similar, because one can be obtained by dilating the other about the origin with a scale factor of 1/2.
Explanation:
The dilation of a shape is similar to the original shape; this is because the corresponding side lengths are proportional.A scale factor is how many times larger or smaller the image will be relative to the preimage. In other words, multiply the x and y-coordinates by the scale factor to get the coordinate points of the image.The image is dilated by 1/2.
Take a look.
The coordinate labels of the preimage include: A, B, C, and D.
The coordinate labels of the image include: A', B', C', and D'.
Coordinates of point A: (2, 8)
Coordinates of point A': (1, 4)
**The preimage's x and y-coordinates multiplied by 1/2 will give you the x and y-coordinates of the image.**
PLEASE HELP!!
Consider the following intermediate chemical equations.
C(s) + O2(g) → CO2(g) AH, --393.5kJ
2CO(g) + O2(g) → 2CO2(g) AH, --566.0kJ
2H2O(g) → 2H2(g)+O2(g) AH2 - 483.6 kJ
The overall chemical equation is C(s) + H2O(g) → CO(g) +H2(g). To calculate the final enthalpy of the overall chemica
equation, which step must occur?
Reverse the first equation, and change the sign of the enthalpy. Then, add.
O Reverse the second equation, and change the sign of the enthalpy. Then, add.
O Multiply the first equation by three, and triple the enthalpy. Then, add.
O Divide the third equation by two, and double the enthalpy. Then, add.
Answer:
answer is option 2 hope it helps
The step that must be occurred in the calculation of the enthalpy of the given reaction is option B, reverse the second equation, and change the sign of the enthalpy, then add.
What is enthalpy of a reaction ?The enthalpy of a reaction is the heat energy absorbed or released by the reaction system. For a reaction, the reaction enthalpy can be calculated using the enthalpies of the component reactions.
Here the overall reaction is the formation of CO and H₂ from C and water. The first step is to reverse the second equation and change sign of enthalpy and double the first equation. Then add them, so that the CO₂ get eliminated.
Then, the resultant equation is halved again. Then divide the third equation by two and its enthalpy value also divided by 2. Then add it to the previous one and we get the net equation and corresponding reaction enthalpy.
Therefore, the step that must occur here is option B.
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Which of the following is a characteristic of a strong acid?
O A. It does not conduct electricity in water.
B. It completely dissociates in water.
C. It reacts with water to form H2 gas.
O D. It increases the OH concentration.
The statement, that describes the characteristic of a strong acid is "it completely dissociates in water."
What is a strong acid?
In aqueous solution, strong acids and bases are completely ionised.
A strong acid is one that entirely ionises in solution. When dissolved in water, it emits the maximum number of hydrogen ions or protons, implying that it always loses a proton (H+).
As a result, it is possible to deduce that a strong acid (HA) entirely dissociates in solution.
Hence the correct option is B.
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6.6 moles of ZnO to molecules
Answer:
3.97e24
Explanation:
For every mol of any substance there are 6.02x10^23 molecules
so
6.6(6.02x10^23)= 3.97x10^24 Molecules of ZnO
6. Animals have many adaptations for survival. Describe each adaptation below, and explain how it could help an organism better survive in its environment.
a) camouflage
b) mimicry
c) venom
Which statement most accurately describes a chemical equation?
a. in a chemical reaction, the mass of the energy change must be equal to the energy used
b. in a chemical reaction, the mass of the products must equal the mass of the reactants
c. in a chemical reaction, the mass of each product must be the same
d. in a chemical reaction, the combined mass of the container the substances is always equal
Answer: C
Explanation:
How many moles in 18g of H3PO4?
Answer:
0.184 mol
Explanation:
Look up molar masses for the elements that comprise H₃PO₄:
H = 1.008 g/mol
P = 30.97 g/mol
O = 15.99 g/mol
The molar mass of H₃PO₄ is a weighted sum of these (3 hydrogen + 1 phosphorus + 4 oxygen) that comes out to about 97.99 g/mol.
Then
(18 g H₃PO₄) × (1/97.99 mol/g) ≈ 0.1837 mol
Jaiden Drives for 800 km at an average speed of 120 km/h. How long was her journey?
Answer:
i think her journey was 680 km/h long
Answer:
6.67 hours
Explanation:
(800 km) / (120 km/hr) = 6.67 hours
About what fraction of Earth’s surface is covered by water?
A:1/4
B:1/2
C:3/4
D:9/10
the chemical name for Cu3N2 is?
A)copper(I) nitride
B)copper nitride
C)copper (II) nitride
D)copper (I) nitride
The addition of electron shells results in _______ shielding of electrons from the nucleus.
Answer:
I believe the answer is "increasing"
Answer:
the shielding of electrons.
Explanation:
The nucleus pulls electrons to itself due to the net positive charge on it.As more electronic shell is added, the effect of the pull weakens outward.The inner shell experiences the nuclear pull more than the outer shell electrons.What is the “advantage” and “disadvantage” when there is a mechanical advantage less than 1?
SELECT ALL THAT APPLY
A. Force Advantage
B. No Advantage
C. Distance Advantage
D. Force Disadvantage
E. Distance Disadvantage
Answer: Force disadvantage and distance advantage
Explanation: When mechanical advantage is less than one the force of the strength decreases because input force is greater than output force.
The distance increases ie the object is moving over a long distance.
Example when fishing with a long fishing rod the force applied to move the fish from the water is greater than the weight of the fish itself. The advantage of using the long fishing pole is that the distance over which the fish travels is greatly increased.
Hope this helps. It took me about half an hour before I could get this answer from my various searches. The idea might not be clear but this was what I was able to understand.