Answer:
This question is incomplete
Explanation:
This question is incomplete. But generally in chemistry, if there is no change in properties of the components of a substance, that substance is said to be a mixture. A mixture is a substance that contains two or more constituents that are physically combined and independently distinct. For example, a mixture of salt and water to form salt solution can still be retrieved as salt and water separately despite been in a combined form earlier. This is because this components/constituents (water and salt) are physically combined.
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.
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Learning Properties of Matter Quiz Unit 2 Lesson 11 Grade 8
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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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Which scientist developed the 1st model of the atom that showed the structure of the inside of an atom?
A. Dalton
B. Borh
C. Rutherford
D. Thomson
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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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
What color is a mirror?
Answer:
mirrors do not have a color, many people believe they are green because they reflect the most green light back into our eyes.
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:
Andy is waiting at the signal. As soon as the light turns green, he accelerates his car at a uniform rate of 8.00 meters/second2. What is the displacement of Andy’s car after 30.0 seconds?
A.
1200 meters
B.
2400 meters
C.
3600 meters
D.
4800 meters
E.
7200 meters
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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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
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
distinguish among a mixture, a solution, and a compound.
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.
Consider a situation in which the enzyme is operating at optimum temperature and pH, and has been saturated with substrate. What is your best option for increasing the rate of the reaction?HintsIncrease the pH.Increase the temperature.Increase the enzyme concentration.Increase the substrate concentration.
Answer:Increase the enzyme concentration
Explanation:
If the enzyme is saturated, it simply means that all the enzyme molecules present has been bound to substrates.
Of course, there will still be more substrates left in the system since the enzyme is saturated. The reaction rate can now be increased by increasing the enzyme concentration so that more enzyme molecules can be bound to substrates.
[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
8. Your pigs are going through ten 50.0 lb bags of feed per week. How many kilograms of feed are the pigs
eating per day?
HELP ME PLEASE
Answer:
8. 3.24 kg
9. 6.31 litres/minute.
10a. 15.3 m³
10b. $ 612.
Explanation:
8. Determination of the kilogram of feed eaten by the pig per day.
From the question given,
The pig consumed = 50 lb bags
Duration = 1 week
Consumption per day =..?
Next, we shall convert 50 lb to kg. This can be obtained as follow:
1 lb = 0.454 Kg
Therefore,
50 lb = 50 lb × 0.454 Kg/ 1 lb
50 lb = 22.7 kg
Next, 1 week us equivalent to 7 days.
Thus, the pigs consumed 22.7 kg of feed in 7 days. Therefore, the pigs will consume X kg of feed in 1 day i.e
X kg of feed = 22.7/7
X kg of feed = 3.24 kg
Therefore, the pigs will consume 3.24 kg of feed per day.
9. Determination of the rate in litres/minute.
Rate = 100 gallon/hour
Rate (litres/minute) =?
We'll begin by converting 100 gallon/hour to litre/hour. This can be obtained as follow:
1 gallon/hour = 3.785 litres/hour
Therefore
100 gallon/hour = 100 × 3.785
100 gallon/hour = 378.5 litres/hour
Finally, we shall convert 378.5 litres/hour to litres/minute. This can be obtained as follow:
1 litre/hour = 1/60 litre/minute
Therefore
378.5 litres/hour = 378.5 × 1/60
378.5 litres/hour = 6.31 litres/minute.
Therefore, 100 gallon/hour is equivalent to 6.31 litres/minute.
10a. Determination of the concrete in m³.
Concrete needed = 20 yd³
Concrete needed (in m³) =...?
1 yd³ = 0.765 m³
Therefore,
20 yd³ = 20 yd³ × 0.765 m³/ 1 yd³
20 yd³ = 15.3 m³
Therefore, 20 yd³ is equivalent to 15.3 m³
10b. Determination of the cost spent on the wall. This can be obtained as follow:
1 m³ = $ 40
Therefore,
15.3 m³ = 15.3 m³ × $ 40 / 1 m³
15.3 m³ = $ 612
Therefore, $ 612 will be spent on the wall.
Why would hand sanitizers not be as effective as detergents to clean your
clothes in a washing machine?
Hand sanitizers are not effective to be used for cleaning clothes are they can lead to spots.
Hand sanitizers for hygiene:Hand sanitizers can cause smirch-like flaws on clothing. Some contain alcohol, a known stain remover. When the sanitizer comes into contact with clothing, it can dispose of the assortment from the surface. The engravings are known as blurring spots.
Thus, for washing clothes detergents are used due to their properties.
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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!
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 }
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.
After throwing the ball in the pool for my dog the ball sprung a leak and begin to fill with water. How many mL of water can the ball absorb before the ball sinks
Answer: i think 250ML
Explanation:
Please help me! I will give a 7 point Brainliest and 13 points!
What is the molarity of a solution prepared from 19.4 g NaCl in 300.0 mL of solution?
Answer:
1.11 M NaCl
Explanation:
Quizlet???
Hi! i’m not sure which one this is, please help. (:
Answer:
Explanation:
-"If he wanted to keep 'em after he was dead, a wicked old screw," pursued the woman, "why wasn’t he natural in his lifetime? If he had been, he'd have had somebody to look after him when he was struck with Death, instead of lying gasping out his last there, alone by himself."
This is showing that if he hadn't be so selfish and righteous, then he would not have been alone to die without anyone there to help or comfort him. In the line, "why wasn't he natural in his life?", is asking why he wasn't a nice person. Why didn't he help others. If he had helped others, he would not have been so alone.A story set during a major battle, as both have a sudden rush of events.
in periodic table, valance electrons are indicated by
An area of the atom that holds negative particles
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
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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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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Which of these two statements meets the criteria of a
scientific hypothesis?
a. Acids turn red litmus paper blue.
b. All life in the universe exists on Earth.
Litmus paper can't accurately determine how acidic or alkaline a substance is because the results are qualitative (observable), not quantitative (measurable).
What is Litmus paper?
Mechanism. It contains a mild acid, red litmus. The hydrogen ions interact with the additional base when it is in contact with a basic substance.
The moist red litmus paper turns blue when placed in an alkaline solution because the conjugate base that is created from the litmus acid has a blue.
Chemistry uses a litmus or litmus paper test to detect if a solution is basic or acidic. Some lichen species are the source of litmus.
When exposed to an acid, litmus will turn red; when exposed to a base, it will turn blue.
Therefore, statements a meets the criteria of a scientific hypothesis.
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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:
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