Answer:
1.51× 10²³ C atoms
Explanation:
Given data:
Mass of CO₂ = 11 g
Number of atoms in 11 g of CO₂ = ?
Solution:
First of all we will calculate the number of moles of CO₂ .
Number of moles = mass/ molar mass
Number of moles = 11 g/ 44 g/mol
Number of moles = 0.25 mol
One mole of CO₂ contain 1 mole of C atom.
0.25 mole of CO₂ contain 0.25 moles of C atom.
The number of C atoms in 0.25 moles will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number .
11 g of CO₂ = 0.25 moles of C = 0.25 × 6.022 × 10²³ C atoms
1.51× 10²³ C atoms
[20 points] What kind of bond is pictured in the diagram to the left? Describe the movement of the valence electrons in the bond above? (Hint: Sharing or giving up?)
Answer: The kind of bond is a covalent bond.
Explanation: The two atoms on top are separated or not together while the other is. the two atoms on top are negative while only one molecule on the bottom is negative. And, the top pair is atoms and the bottom pair is molecule
what is the mass of a proton
A material has a density of 8.9 g per c m cubed. You have three cubic centimeters of the substance. What is the material's mass in grams?
Question 25 options:
3.0 g
0.3 g
27 g
5.9 g
Explanation:
density can be calculated using the following rule: density=mass/volume
therefore,
mass = density x volume
we have density 8.9gm/cm³ and volume=3cm³ substituting in the above equation, we can calculate the mass as follows:
mass = 8.9 x 3 = 26.7 grams,
Approx 27 grams
27 g is your answer
Answer:
density =8.9g/cm³
Explanation:
1cm³=8.9g
3cm³=8.9×3=26.7g
Describe the basic properties of each physical state of matter: solid, liquid, and gas
Answer:
solid matter is composed of tightly packed particles. A solid when we retain its shape the particles are not free to move around. liquid matter is made of more Loosely packed particles. It will take the shape of its container. Particles can move about within a liquid, but they are packed densely enough that volume is maintained. gaseous matter is composed of particles packed so loosely that it is neither a defined shape nor a Define volume. A gas can be compressed
what is density?????? any help anyone
Answer:
Density, mass of a unit volume of a material substance
Explanation:
Answer:
Hello!
Explanation:
Density: The degree of compactness of a substance.
happy to help!
Does matter have weight and take up space?
Explanation:
All matter has mass and occupies space. Volume is a measure of how much space an object occupies. ... "Mass" only depends on how much matter is in an object. "Weight", on the other hand, depends on how strongly gravity pulls on an object.
Which of these scenarios is most likely a chemical reaction?
A. A gas turns into a liquid as it releases energy.
B. A liquid becomes a gas as it absorbs energy.
C. Two white solids are added to a colorless liquid, and a colorless liquid remains.
D. Two colorless liquids are added together, and a colorless liquid and a green solid remain.
Answer:
D. Two, colorless liquids are added together, and a colorless liquid and a green solid remain.
Explanation:
Two, colourless liquids are added together, and a colourless liquid and a green solid remain. Hence, option D is correct.
What is a chemical reaction?A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.
In the scenarios mentioned in the question, all are considered under chemical reactions.
● In the first reaction when gas is turned into a liquid and energy is released few molecules get transformed into other compounds and hence chemical change takes place.
● In the second case when two white solids are mixed in a colourless liquid the two white solids get dissolved in the colourless liquid forming a new solution which is a chemical change.
● In the third case two colourless liquids are added together and a colourless liquid and a green solid are the products of IT in this case also a chemical reaction takes place resulting in the formation of a green colour Residue.
Two, colourless liquids are added together, and a colourless liquid and a green solid remain. Hence, option D is correct.
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Convert 132 cm to km
132 cm to 0.00132 km.
there you go, hope this helps!
what is acidity of nh4oh
Answer:
The formula NH4OH is ammonium hydroxide. ... The pH of NH4OH is 11.6, so it is a base.
Explanation:
Answer:
The base chemical in the manufacture of nitric acid
Explanation:
C9H8O4 Aroms in formula
Answer:
hope this helps!!
MOLES OF ELEMENTS IN A FORMULA
type of element. For example, in a molecule of aspirin, C9H8O4, there are 9 carbon atoms, 8 hydrogen atoms and 4 oxygen atoms. compound. For example, one mole of aspirin contains 9 moles of carbon atoms, 8 moles of hydrogen atoms and 4 moles of oxygen atoms.
Explanation:
9 What is the difference between the velocity and the speed of an object?
Determine which physical conditions are necessary to support nuclear fusion and formation of stars.
lower temperature
higher temperature
increased gravitational attraction
decreased gravitational attraction
Promotes Stellar Formation
Does Not Promote Stellar Formation
Answer:
Promotes Stellar Formation:
-Increased Gravitational Attraction
-Higher Temperature
Does Not Promote Stellar Formation:
-Decreased Gravitational Attraction
-Lower Temperature
Explanation:
Stars need at least three million kelvins to form, and the gravitational attraction helps form the star in the first place.
The physical conditions that are necessary to support nuclear fusion and formation of stars are divided into two headings. They are:
Promotes Stellar Formation:
Increased Gravitational AttractionHigher TemperatureDoes Not Promote Stellar Formation:
Decreased Gravitational AttractionLower TemperatureThere are some conditions that needs to be put in place before Nuclear Fusion can occur. It often needs temperatures of about 100 million Kelvin.
The ions have to be placed together in close proximity to allow fusion to take place between them.
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17.0cm
23.0cm
4.00cm
A 38.6 kg marble slab is shown above. What is its density?
g/cm3
Answer:
24.68 g/cm³
Explanation:
We'll begin by calculating the volume of the marble. This can be obtained as follow:
Volume = 17 × 23 × 4
Volume = 1564 cm³
Next, we shall convert the mass of the marble (i.e 38.6 kg) to grams (g). This can be obtained as follow:
1 kg = 1000 g
Therefore,
38.6 kg = 38.6 kg × 1000 g / 1 kg
38.6 kg = 38600 g
Therefore, 38.6 kg mass of the marble slab is equivalent to 38600 g.
Finally, we shall determine the density of the marble slab as follow:
Volume = 1564 cm³
Mass = 38600 g.
Density =..?
Density = mass /volume
Density = 38600 g / 1564 cm³
Density = 24.68 g/cm³
Therefore, the density of the marble slab is 24.68 g/cm³
Part 2. Solve the following problems and round to the correct number of significant figures.
1. 0.8x 937=
2. 908/5.679=
3. 3300/54.6=
4. 47.88x63.75x6500=
5. 600/74.728=
6. 9000/33.584=
7. 0.0073x15.47x9007=
8. 50x91.89x10=
9. 900x31.9=
10. 1000/69.34=
11. 1.25-1.1159=
12. 14.818-3.4842=
13. 88.311+7.5868+33.3=
14. 7.742+2.3+66.257
15. 2.16+4.317+19.9=
16. 74.4+1.81=
17. 27.51+1.715
18. 34.8+42.49=
19. 36.394-9.6=
20. 9.519+55.591+6.7=
Answer:
1. 749.6
2. 159.8
3. 60.4
4. 19,840,275
5. 8.029118938015202
6. 267.984
7. 1,017.169517
8. 45,945
9. 28,710
10. 14.42169022209403
11. 0.1341
and that is all that I am going to give you for the last few try to use a calculator
Explanation:
use a calculator
identify the following atom
Answer:
Explanation:
First count the protons. I think there are 10 of them. That pretty much locks it in. The atom must be Neon.
All the electrons are in the first 2 rings and there are 10 all together.
Neon
PLEASE HELP ME AGAIN!!!!! Explain the observed pattern of how the sizes and charges of atoms change with the addition and subtraction of electrons.
Answer: Positive ions that have lost an electron are smaller than their neutral atoms. Negative ions that have gained an electron are larger than their neutral atoms.
Explanation: I found this in my chemistry textbook.
Neutral atoms increase in size down a group and decrease across a period.
If neutral atom gains or loses an electron, forming anion or cation, increase or decrease in radius occurs and this trend differs from that of atomic radii.
What is atomic radii ?Atomic radius or Radii is defined as the total distance from the nucleus of the atom to the outermost orbital of its electron, similar to radius of a circle.
The determination of the atomic radii is difficult due to the uncertainty in the position of the outermost electron, so Heisenberg’s Uncertainty Principle is applied to obtain a precise measurement of the radius.
An atom also show different radii depending on the type of bond, hence there is no fixed radius of an atom.
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When you open the door to your house on a cold day, you feel a cold draft. What causes this?
Answer:
Inside it's usually warm so when you open a door to outside which is cold a cold front and a warm front will be exposed to each other cold will win usually since cold goes below the warm front.
Explanation:
Which statement describes the differences between nuclear reactions and chemical reactions?
Answer:
the answer is C
Explanation:
Review the electron configurations of the elements in period 4, moving from potassium (K) to krypton (Kr). Select all the elements in period 4 that have electron configurations different from what the rules predict they should have.
Answer:
Chromium (Cr) and Copper (Cu)
Explanation:
Chromium (Cr) and Copper (Cu) have electron configurations different from what the rules predict in period 4.
What is an electron configuration?Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.
The order of filling of electrons occupying the 3d subshell gets concerned in chromium and copper and because of distress in 3d subshell, these elements possess exceptional configuration.
Hence, Chromium (Cr) and Copper (Cu) have electron configurations different from what the rules predict in period 4.
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Emma has 37 green apples and 15 red apples. What is the ratio of red apples to green apples?
Answer:
15:37
Explanation:
cant simplify because 37 is prime
Cl2 reacts with the element Sr to form an ionic compound. Based on periodic properties, identify a molecule, X2, that is likely to react with Sr in a way similar to how Cl2 reacts with Sr. Justify your choice.
Answer:
Explanation:
Scrontium (Sr) is a metal in group 2 of the periodic table. While chlorine (Cl) is a nonmetal (halogen) in group 7 of the periodic table. Generally, elements in this two groups of the periodic table react together to form an ionic/electrovalent compound as illustrated in the question (shown below).
Sr + Cl₂ ⇒ SrCl₂
Because, members of group 2 react well with halogens to form an ionic/electrovalent compound, Sr can also react with iodine (I₂) or bromine (Br₂), any of which can be our X₂ (because the reactions are similar to that of how Cl₂ react), as shown below
Sr + I₂ ⇒ SrI₂
Sr + Br₂ ⇒ SrBr₂
A molecule, X₂, that is likely to react with Sr in a way similar to how Cl₂ reacts with Sr is F₂
Scrontium (Sr) is an Alkaline earth (i.e group 2) metal. It has 2 valence electrons and form bond by losing the two valence electrons.
Sr —> Sr²⁺ + 2e¯...... (1)
Chlorine (Cl) is a group 17 element (i.e Halogen). It has 7 valence electrons and form bond by accepting electron 1 to completely its octet configuration.
Cl + e¯ —> Cl¯.... (2)
Combining equation 1 and 2, we have
Sr + 2Cl + 2e¯ —> Sr²⁺ + 2Cl¯ + 2e¯
Cancel out 2e¯
Sr + 2Cl —> Sr²⁺2Cl¯
Sr + Cl₂ —> SrCl₂
NOTE: Group members has similar chemical properties. Therefore, other members of group 17 (i.e fluorine, bromine, iodine) can under go similar reaction with Scrontium (Sr).
For example Fluorine:Sr —> Sr²⁺ + 2e¯...... (1)
F + e¯ —> F¯.... (2)
Combining equation 1 and 2, we have
Sr + 2F + 2e¯ —> Sr²⁺ + 2F¯ + 2e¯
Cancel out 2e¯
Sr + 2F —> Sr²⁺2F¯
Sr + F₂ —> SrF₂
Thus, fluorine molecule, F₂, will react with Sr in a way similar to how Cl₂ react.
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again with the chemistry questions all help is appreciated :’)
Answer:
The answer is Rubidium
Explanation:
The number of protons is unique for each element. It is also identified as an element’s atomic number. Look for an element with the number of protons as the atomic number to find the unidentified element.
Answer:
Hello again, I think the option will be the third one Rubidium im highly sure because the periodic table goes by the number of protons which in your question is 37. So yeah it will be rubidium.
Explanation:
Look for 37 protons in the periodic table.
Respiration changes:
food into energy
food into water and oxygen
water and carbon dioxide into food
energy into foodant.
please answer!!!!
Which properties change the composition of a substance?
A. chemical properties
B. chemical and physical properties
C. physical properties
D. neither chemical nor physical properties
Answer:
ok
Explanation:
Which properties change the composition of a substance?
A. chemical properties
B. chemical and physical properties
C. physical properties
D. neither chemical nor physical properties
Answer:
chemical properties
Explanation:
chemical properties did change the composition of substance, so it cannot go back to original anymore, such as burning, rusting, etc.
I took the test before. I got all the answer correct and got 100% score.
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Learning Properties of Matter Quiz Unit 2 Lesson 11 Grade 8
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Which of the following has mechanical energy? (5 points)
Car battery
Compressed spring
Glowing incandescent lightbulb
Nucleus of uranium atom
Answer:
compressed spring
Explanation:
what is the element name Au
Answer:
Gold
Explanation:
Answer: Gold
Explanation:
Au represents gold
which best describes explains how elements are arranged on the periodic table
elements are arranged by the atomic number of the element
The sun emits electromagnetic waves at many frequencies, but mostly in the infrared, visible, and ultraviolet
spectrums. What kind of energy is this?
nuclear
radiant
thermal
chemical
HELP
Answer:
B: Radiant
Explanation:
E2021...I got you guys
Answer:
radiant
Explanation:
describes changes
in energy during a chemical reaction?
Answer:
Yes
Explanation:
Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.
Exothermic reaction - A chemical reaction in which heat energy is given out .
Buring of natural gas , respiration, formation of compost from vegetables matter also exothermic processes.
Examples
C(s)+O2(g)⸻➤CO2(g)+94.00kcal
2H2(g) +O2(g)⸻➤2H2O(l) +136.0kcal
Endothermic reaction - A chemical reaction in which heat energy is absorbed is called endothermic reaction.
Example
C(s)+2S⸻➤CS(l)-22kcal
C(s)+H2O⸻➤CO(s) +H2(s)-31.4 kcal
{ ⸻➤at 1100°C }
As the temperature of a gas decreases, what change occurs in the amount of kinetic energy? The kinetic energy
Answer:
When the average kinetic energy of the molecules goes up (a rise in temperature), the average speed of the molecules increases. And lower average kinetic energy of the molecules means they have lower speed. When heat (energy) goes into a substance one of two things can happen:
Explanation:
If the temperature is increased, the average speed and kinetic energy of the gas molecules increase. ... If the gas volume is decreased, the container wall area decreases and the molecule-wall collision frequency increases, both of which increase the pressure exerted by the gas (Figure 1). Avogadro's law.
As the temperature of a gas decreases, the amount of kinetic energy also decreases .
How does decrease in temperature affect the amount of kinetic energy?If the temperature is increased, the average speed and kinetic energy of the gas molecules increase.
If the temperature of gas volume is decreased, the container wall area decreases and the molecule-wall collision frequency increases.
The temperature of a gas decreases and hence , results in the amount of kinetic energy also decreases .
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