Answers
Answer:
a
Explanation:
B is wrong cause it’s not caused by heating
C is wrong cause it’s not caused by cooling
D IS ALSO THE ANSWER
Related Questions
Which person has the most potential energy
Answers
Answer:
b
Explanation:
anyone know this? I'll brainlist u!
Answers
Answer:
for the second one i'd go with reflection
Explanation:
Calculate the mass of the following:
9.11 mol He
Answers
Answer:
36.44 g of He
Explanation:
To convert from moles to grams, you simply multiply by the atomic mass. The conversion table looks like the following:
[tex]\frac{9.11 mol}{1}[/tex] * [tex]\frac{4.00 g}{1 mol}[/tex]
The mol units then cancel, and you are left with 36.44 g of Helium.
A chemical reaction takes place to allow hand warmers to give off heat. This is an example of a(n) __________.
A. physical change
B. exothermic reaction
C. endothermic reaction
D. precipitate
Answers
Answer:
Exothermic
Explanation:
Exothermic reactions release heat, endothermic absorb heat, and precipitate is a solid formed from a solution
Answer:
B.
Explanation:
Gives off heat,.
which group contains most elements
Answers
Answer:
group 8 (group 0)
just take a look at the periodic table
two types of tests you could perform to determine if a substance was a metal or nonmetal.
Answers
Granted it can vary given different types of mixed metals, and other materials might share similar characteristics. Characteristics of a given metal can be found like density, which can be determined using volumetric and weight measurements. Other characteristics are also measurable including tensile strength, resistance to impact, flexability. hardness tests, and several others like conductivity and even chemical testing.
Granted other non-metal materials could have similar or even identical characteristics, there are fundamental properties metals have related to their elements. To know which specific metals we have, by heating them we could determine what is in samples by specific and fundamental melting points.
Metals will vibrate and flex to a certain degree, hence their sounds. Given we have a bought or found a metal, we then can measure its corresponding characteristics stated above (tensile strength, density, etc…) by using a variety of micro and macro testing procedures. For example, the characteristic of hardness is easily found by pressing an indentation into a metal and measuring its depth — that's called the Rockwell Method, and there are several others I have still yet to try and discover:)
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Related Questions (More Answers Below)
The easiest easy to find about metal is through the periodic table. Most of the ele,mtns are metals and the only exception is hydrogen which is nonmetal as it's in its gaseous state.
Hence about 75% of the elements are metals. Many metals ending has ium. Like lithium, titanium and non metals have endings with gen such as oxygen, hydrogen, and argon. Metals are ductile can be drawn into wire form. Metals have a luster that is they reflect Metals are good conductors of heat and electricity. Thus these are some of the methods to test.Learn more about the tests you could perform to determine if a substance was a metal or nonmetal.
brainly.com/question/11493240.
Kendra conducts an experiment. She mixes two chemicals, resulting in a chemical reaction. Based on Kendra's
experiment, what can be concluded about the original matter before mixing?
It did not change in identity but did change properties.
It changed in identity but not properties.
It changed in identity and properties.
It did not change in identity nor properties.
Answers
Answer: It changed in identity and properties.
Explanation:
Answer:
C: It changed in identity and properties
Explanation:
Hope this helps! good luck :)
Can someone help me balance these out?
Answers
Answer:
2 C7H6O2 + 15 O2 --> 14 CO2 + 6 H2O
Explanation:
how do i find out the subscripts of an ionic compound?
Answers
Answer:
1. Write the symbol and charge of the cation (metal) first and the anion (nonmetal) second. 2. Transpose only the number of the positive charge to become the subscript of the anion and the number only of the negative charge to become the subscript of the cation
Nakeem and his team were playing basketball in the gym, and all the basketballs were firm and bounced well. When the team went outside,
the same basketballs seemed a bit flat and would not bounce well. Which statement provides the best explanation for what happened to the
basketballs?
O A The temperature outside was colder than the temperature in the gym, so the pressure of the air in the balls increased.
B. The temperature outside was warmer than the temperature in the gym, so the pressure of the air in the balls increased.
OC. The temperature outside was colder than the temperature in the gym, so the pressure of the air in the balls decreased.
OD. The temperature outside was warmer than the temperature in the gym, so the pressure of the air in the balls decreased.
Answers
Answer:
c
Explanation: i took the test lol
The temperature outside was colder than the temperature in the gym, so the pressure of the air in the balls decreased. Hence option C is correct.
What is pressure?Pressure is defined as the force exerted perpendicularly to an object's surface measured in units of the force's distribution. In comparison to the surrounding pressure, gauge pressure is the pressure. The concept of pressure is crucial to fluid mechanics and is used to characterize a gas's energy in the ideal gas law, among many other physical uses.
The pressure law states that for a constant volume of gas in a sealed container, the temperature of a gas is directly proportional to its pressure. This is easily understood by picturing how the gas particles in the container move more energetically as the temperature rises.
Thus, the temperature outside was colder than the temperature in the gym, so the pressure of the air in the balls decreased. Hence option C is correct.
To learn more about pressure, refer to the link below:
https://brainly.com/question/12971272
#SPJ2
23. Color of a metter is
Answers
Which pattern(s) may be observed from the arrangement of elements in the periodic table? Select all that apply.
A. increasing number of protons
B. similarity in the number of their valence electrons
C. similarity in their physical and chemical properties
D. increasing relative abundance on Earth's surface
Answers
Answer:
A, B, C.
Explanation:
The periodic table exemplifies the number of protons for each element, the number of valence electrons for each element, and depending on the specifications and the complications of the periodic table (in other words the higher quality of a periodic table) will also commend upon you physical and chemical properties of each element and each group of which they belong to. Hopefully this helps.
The pattern(s) may be observed from the arrangement of elements in the periodic table -
A. increasing number of protonsB. similarity in the number of their valence electronsC. similarity in their physical and chemical propertiesThe periodic table has various types of patterns in their arrangement of elements.
As you move to the right, the atomic number increases, meaning the number of protons increases.The number of valence electrons decreases from left to right across each period.The number of valence electrons increases from top to bottom within each groupEach element within a group has similar physical or chemical properties because of its atom's outermost electron shellThus, the correct choices are - A, B, and C.
Learn more:
https://brainly.com/question/7373020
Four substances have the physical properties shown.
Which substance is an ionic solid?
melting point
1 °C
boiling point
1°C
electrical
conductivity
of solid
electrical
conductivity
of molten
substance
electrical
conductivity
of aqueous
solution
A
-115
-85
poor
poor
good
B
660
2470
good
good
insoluble
с
993
1695
poor
good
good
D
1610
2230
poor
poor
insoluble
Answers
Answer:
the answer is the location of the WORLD is the same as the answer to the answer
To find out if the height from which a student drops a ball affects how high the ball bounces, the independent variable is the
Answers
Answer:
The independent variable is the height of the ball that bounces.
A sample of ink is put in the center of filter paper . Several drops of ethanol are then put on the ink mark. Two concentric rings of circle are obtained. What is the best conclusion about the ink we can come to? a. It contains two colored substance only b. It contains at least two coloured substances c. It is a compound d. It is broken down by ethanol
Answers
Answer:
The correct option is;
b. It contains at least two colored substances
Explanation:
In chromatography, a mixture is separated into its components, such that in the filter paper, on which the drops of ethanol are then placed on the ink mark, we have different phases of the components of the mixture that have different levels of mobility by capillary action through the filter paper. Therefore, given that two concentric rings of circles are obtained, we have that each ring is composed of a different component of the mixture and there are therefore, at least two colored substances.
“Chemistry is the study of all substances. Chemistry is everywhere” you think this is a good enough answer for a test about “what is chemistry?
Answers
Answer:
Try to make it more detailed "Chemistry is the study of all substances" is an amazing start. Can you give some examples of chemistry? Try to make a small paragraph.
Explanation:
Explanation:
Chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.
This is a more detailed answer...
If car has traveled 24 km in 2 hours,what is the average speed
Answers
Answer:
The answer is 12 km/hrExplanation:
The average speed can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
where
d is the distance
t is the time taken
So we have
[tex]a = \frac{24}{2} \\ [/tex]
We have the final answer as
12 km/hrHope this helps you
Which of the following is the correct Lewis Dot Structure for MgBr2?
PHOTO ABOVE
Answers
Answer:
Option A
Explanation:
To know the correct answer to the question, let us write an equation illustrating the formation of MgBr₂.
This is illustrated below:
1. Magnesium (Mg) is divalent element hence it will lose 2 electrons to form magnesium ion (Mg²⁺) as shown below
Mg —> Mg²⁺ + 2e¯
2. Bromine (Br) is a univalent element. Two bromine atom will receive the two electrons (i.e each atom receives 1 electron) to form the bromide ion (Br¯) as shown below:
2Br + 2e¯ —> 2Br¯
Combine both equation
Mg + 2Br + 2e¯—> Mg²⁺ + 2e¯ + 2Br¯
Cancel out 2e¯
Mg + 2Br —> Mg²⁺ + 2Br¯
Thus we have
Br—Mg—Br
From the illustration made above, we can see that two bromine atom is receiving 1 electron each from the magnesium atom
how do you get from mass to moles in this problem?
Answers
Answer:
what problem?
According to Coulomb's law, what will happen to the electric force between
two identical negative charges as they move closer together?
A. F, will stay positive and increase in magnitude,
B. Fe will stay negative and increase in magnitude,
C. F, will become negative and decrease in magnitude
0
D. F will become positive and decrease in magnitude,
SUS
Answers
Answer:
A
Explanation:
Apex
Which set of coefficients will balance this chemical equation?
__C2H4 + __02 - 2 CO2 + 2 H2O
A. 2,5
B. 1,3
C. 1, 2
D. 2,3
Answers
Answer:
Option B is correct = 1,3
Explanation:
Chemical equation:
C₂H₄ + O₂ → CO₂ + H₂O
Balanced chemical equation:
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
Step 1:
Left side Right side
C = 2 C = 1
H = 4 O = 3
O = 2 H = 2
Step 2:
C₂H₄ + O₂ → 2CO₂ + H₂O
Left side Right side
C = 2 C = 2
H = 4 O = 5
O = 2 H = 2
Step 3:
C₂H₄ + O₂ → 2CO₂ + 2H₂O
Left side Right side
C = 2 C = 2
H = 4 O = 6
O = 2 H = 4
Step 4:
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
Left side Right side
C = 2 C = 2
H = 4 O = 6
O = 6 H = 4
1.) Nonmetallic elements form ions by (Losing/Gaining) valence electrons in order to complete their outer shell. 2.) The (Fewer/More) valence electrons an element has in its outer shell, the easier it is to complete. 3.) The (FewerMore) electron shells an element has, the easier it is to fill its outermost shell. 4&5.)Reactivity in nonmetals (Increases/Decreases) as you go from left to right in a group, and (Increases/Decreases) as you go from top to bottom.
Answers
Answer:
1) Gaining
2) More
3) More
4) increases
5) decreases
Explanation:
Nonmetals are found towards the right hand side of the periodic table. They form ions by gaining electrons due to the fact that they have more electrons in their outermost shell, hence they only need a few electrons to complete the octet structure.
As the number of shells increases, the outermost shell becomes more populated and easier to fill with electrons.
The reactivity of nonmetal elements generally increases from left to right across the periodic table but decreases from top to bottom down the group.
Answer:
1) Gaining
2) More
3) fewer
4) increases
5) decreases
Explanation:
how many significant figures in 1. 19.99 2. 140486 3. 0.0609 3. 5.08 ?
Answers
1. 4 significant numbers
2. 6 significant numbers
3. 3 significant numbers
4. 3 significant numbers
Further ExplanationSignificant numbers are numbers obtained from the measurement results of exact numbers and the last number estimated
1. 19.99
all non-zero numbers are significant numbers , so there are 4 significant numbers
2. 140486
a zero which is located between two non-zero numbers including a significant number , so there are 6 significant numbers
3. 0.0609
a zero in front of a decimal point is not a significant number, so there are 3 significant numbers (6,0 and 9)
4. 5.08
Any zeros between two non-zero numbers are significant, so there are 3 significant numbers(5,0 and 8)
Describe the way matter is measured
Answers
Answer:
in volume in weight and distibution
Explanation:
A student noticed a yellow, solid substance was formed when mixing two clear liquids during a lab. What term describes this yellow, solid substance?
A. physical change
B. exothermic reaction
C. endothermic reaction
D. precipitate
Answers
Answer:
D
Explanation:
a precipitate is formed from a solution
Identify the wave with the greatest
frequency
Answers
Answer: Gamma Waves
Explanation:
Gamma waves have the highest frequency , shortest wavelength and therefore, carry the greatest amount of energy.
Plz help! The best answer will be marked as brainliest!
Make a funny sentence of alloys for Magnesium
Here is an example for Mercury, it HAS to for Magnesium
“I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon”
Answers
Answer:I love to travel however I do erode aluminum so we won't be taking off on undertakings in planes at any point in the near future
Explanation:
How many moles are present in 4.50 L of fluorine gas (F2) at Standard Temperature and
Pressure?
Answers
Answer:
4.50 L gas of fluorine at STP contain 0.2 moles.
Explanation:
Given data:
Volume of gas = 4.50 L
Number of moles F₂ gas = ?
Temperature of gas = standard = 273.15 K
Pressure of gas = standard = 1 atm
Explanation:
Formula:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will put the values in formula.
1 atm × 4.50 L = n × 0.0821 atm.L/ mol.K × 273.15 K
4.50 atm.L = n × 22.43 atm.L/ mol.
n = 4.50 atm.L / 22.43 atm.L/ mol.
n = 0.2 mol
4.50 L gas of fluorine at STP contain 0.2 moles.
the scientefic methos is founded on
Answers
Answer:
Francis Bacon was the first to formalize the concept of a true scientific method, but he didn't do so in a vacuum. The work of Nicolaus Copernicus (1473-1543) and Galileo Galilei (1564-1642) influenced Bacon tremendously.
What is the quickest way to dissolve milk in water? Can milk dissolve in all
solvents? Explain your answer.
Answers
It dissolves in hot water because of the water temperature, the milk could not take it to mix in the hot water