Answer:
-34¨F
Explanation:
Which of the following is a chemical change?
A. Water freezing to form ice
B. Sugar dissolves in water
C. Gasoline burns in a car engine
D. A piece of metal expands when it is heated
Answer:
C. would be the correct option.
Explanation:
Burning gasoline is a chemical change because when gasoline is ignited, water and carbon dioxide are produced. Water freezing to form ice would be a physical change since its state of matter has changed, but not the water itself. Sugar dissolving in water is also a physical change because all it's really doing is just forming bubbles and changing the color. Choice D. would also be a physical change since the piece of metal is still a piece of metal, it just expanded when the temperature increased.
What happens to the atomic radius when an electron is lost?
A. The positive ionic radius is the same size as the neutral atomic
radius.
B. The positive ionic radius does not follow a trend with the neutral
radius.
C. The positive ionic radius is smaller than the neutral atomic radius.
D. The positive ionic radius is larger than the neutral atomic radius.
Answer:the positive ionic radius is smaller than the neutral atomic radius
Explanation:
Answer:The positive ionic radius is smaller than the neutral atomic radius.
Explanation: just took the test
Assume that the pendulum clock shown in the photograph is a closed
system
Which statement describes evidence that the pendulum's energy is conserved
even as it eventually stops moving?
A. Energy must be added to the pendulum to keep it from slowing
down
B. Some of the clock's matter is transformed into new energy
C. The amount of each type of energy in the system can be
measured
D. All its mechanical energy is transformed into other forms of
energy
Answer:
Explanation:
d
Answer:
D. All it’s mechanical energy is transformed into other forms of energy.
Explanation:
I got it right
red is kinda sus today
Answer:
he do be lookin sus
Explanation:
Answer:
yeah
Explanation:
d
Which describes the motion of the car as shown by the graph?
A) travels at a constant speed
B) not moving
C) changing directions
D) speeding up
What is the original source of most energy used on Earth?
Answer:
the sun Solar energy
Explanation:
Energy from the sun. Solar energy is the original source of most energy on Earth. There are many ways we use energy from the Sun.
Answer:
the sun Solar energy
Explanation:
Energy from the sun. Solar energy is the original source of most energy on Earth. There are many ways we use energy from the Sun. btw hope this helps u out =)
Xenon is an element similar to Neon. Its density can be found on the Reference Table. Convert Xenon’s density to scientific notation.
The Scientific Notation of Xenon’s density : 1.31293 × 10²
Further explanationScientific Notation consists of 2 parts
1. the first part: the first digit followed by the decimal point
2. The second part: the power of 10 which shows the number of digits after the decimal point
Xenon's density = 131.293
First digit = 1, then we give the decimal point and the next digit
The power of 10 is determined from the number of decimal points moved from the original decimal point
Because we move the decimal point two digits to the left, the power of 10 has the number 2 (10²)
So that the Scientific Notation form becomes:
1.31293 × 10²
all the atoms in Neon do not have to have 10 protons. True, or false?
Answer:
true
Explanation:
Answer:
False.
Explanation:
The number of protons in an atom also places it on the periodic table- the 1st element on the periodic table is Hydrogen because it has 1 proton. If it had 2- it'd be Helium. Neon must have 10 protons to be #10 on the periodic table. (and to even be Neon)
Which observable property of a star is indicative of the star's surface temperature?
O color
O shape
O speed
O brightness
Hii if you could help that would be great, if the answer is correct ill mark as brainliest :)))
Answer: i would say the first one
Explanation:
What is true of neutrons?
They are negatively charged and are located inside the nucleus.
They have no charge and are located outside the nucleus.
They have no charge and are located inside the nucleus.
They are negatively charged and are located outside the nucleus.
Answer:
C. They have no charge and are located inside the nucleus
Explanation:
This is correct and can I have brainliest
Answer:
your dad and i don't care if i have been warned
Explanation:
he left for some milk
Which of the following statements is correct?
2. Both compounds and mixtures can be separated by physical means.
b. Compounds can be separated by physical means, but mixtures cannot.
c. Mixtures can be separated by physical means, but compounds cannot.
d. Neither compounds nor mixtures can be separated by physical means.
Answer:
c. Mixtures can be separated by physical means, but compounds cannot.
Explanation:
Mixtures are comprised of two or more pure substances that have not combined to make a new substance. Because all pure substances have their own unique properties, mixtures can be separated by physical means.
Compounds are pure substances which means they have their own properties. Compounds are formed through a chemical means, and therefore must be separated through a chemical means.
Answer:
C
Explanation:
In compounds: Their individual constituent do not retain their properties hence cannot be separated by physical means
In mixtures: Their individual constituent retain their properties hence can be separated by physical means
What is the charge of a Li
ion?
Answer:
4.2 volts per cell.
Explanation:
Along with subduction, what other process changes sedimentary rocks to metamorphic rocks?
oxygenation
temperature
weathering
gravity
Answer:
B
Explanation:
11. How many moles are in 7.14 X 10 35
molecules of 02?
Answer:
The answer is 1.186 × 10¹² molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 7.14 × 10^35 molecules of O2
We have
[tex]n = \frac{7.14 \times {10}^{35} }{6.02 \times {10}^{23} } \\ [/tex]
We have the final answer as
1.186 × 10¹² molesHope this helps you
CAN SOMEONE PLEASE HELP ME ASAP PLEASEE ANYBODY LITERALLY ANYONE OUT THERE PLEASE
Which subatomic particle can be shared between separate atoms?
Answer:
Electrons
Explanation:
Atoms can combine together and share electrons between them. Atoms that share electrons are linked to each other in a form, called a molecule that is in a lower energy state than either of the separate atoms alone.
Pls Brainliest! It would mean a lot! ;)
Why is the state of matter a physical
property of matter?
Beacuse a liquid is a physical property of matter so is gas solid and plazma what im getting it is they are propertys beacuse that helps the mind process them better.
How much NaCl will dissolve in 100g H2O at 35oC?
In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 80∘C .
it may help you
Which types of reactions would result in the production of gas?
Answer:
Often a given reaction can be placed in two or even three categories, including gas-forming and precipitation reactions. Many reactions produce a gas such as carbon dioxide, hydrogen sulfide, ammonia, or sulfur dioxide.
Mark me as brainliest if u found it helpful
Combustion is a types of reactions which would result in the production of gas. Chemical reaction, the transformation of one or more chemicals into one or more distinct compounds.
What is chemical reaction?Chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.
Chemical reactions are indeed a fundamental component of life itself, as well as technology and culture. Hydrocarbon - based, smelting iron, creating glass but also pottery, brewing beer, making wine, and making cheese are just a few examples of ancient processes that involved chemical reactions. Combustion is a types of reactions which would result in the production of gas.
Therefore, combustion is a types of reactions which would result in the production of gas.
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give five differences between physical and chemical change
hey! need help filling in this chart ASAP, thanks
Answer:
Be: Helium--------Loses-------4--------Be2+
B: Helium--------Loses--------5--------B5
N: Helium--------Gain---------7--------N3−
O: Lithium---------Gain--------8-------O2−
F: Neon--------electrically neutral-------9---------F-
Explanation:
Hope this helps:)
Calculate the density; D= mass/ volume
1)
A student measures the mass of an
8 cm3 block of brown sugar to be 12.9 g.
What is the density of the brown sugar?
2) A chef fills a 50 mL container with 43.5 g of
cooking oil. What is the density of the oil?
Answer:
density of sugar = 1.6 g/cm³
density of oil = 0.87 g/mL
Explanation:
1)
Given data:
Mass of object = 12.9 g
Volume of object = 8 cm³
Density of brown sugar = ?
Solution:
Formula:
d = m/v
d = density of object
m = mass of object
v = volume of object
Now we will put the values in formula.
d = 12.9 g/ 8 cm³
d = 1.6 g/cm³
2)
Given data:
Mass of oil = 43.5 g
Volume of container = 50 mL
Density of oil = ?
Solution:
Formula:
d = m/v
d = density of oil
m = mass of oil
v = volume of oil
Now we will put the values in formula.
d = 43.5 g/ 50 mL
d = 0.87 g/mL
Mario and Patience are making cookies. They are ready to drop balls of dough on baking sheets. They have baking sheets made of treated glass, aluminum, stainless steel, and copper. The specific heats of these substances are:
Treated glass = 0.75 J/g • °C
Aluminum = 0.90 J/g • °C
Stainless steel = 0.50 J/g • °C
Copper = 0.39 J/g • °C
Based on the specific heat values, which sheet is going to warm up the quickest, and, therefore, bake the cookies the fastest?
Answer:
copper
Explanation:
did it on e2022
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, the correct option is copper.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances. Different element have different heat capacity.
Mathematically,
q = n ×ΔH
where
q = amount of heat
n = no of moles
ΔH = enthalpy
n = w / M.M
w = given mass
M.M = molar mass
The sheet with lower value of heat capacity, will get warm up the quickest. So, copper is the sheet which is going to warm up the quickest, and, therefore, bake the cookies the fastest.
Therefore, the correct option is copper.
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What is our solar System inside
Answer:
The milky waY is the answer
Explanation:
Nio conducts a science experiment. He puts yeast into a bottle with water and sugar, and then caps the bottle with a balloon. He returns two hours later and notices there are bubbles on the surface of the mixture in the bottle and that the balloon has inflated, but there are no other apparent changes.
What most likely happened?
a non-chemical change, because there are no indicators of chemical changes taking place
a chemical change, because the mixture changed color
a chemical change, because a gas was produced
a non-chemical change, because the changes that occurred are reversible
Answer:the answer is a chemical change, because a gas was produced
Explanation: yeast is a chemical
Answer:
The answer is C.
"Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions."
Explanation:
1. Compare and contrast the characteristics of metals and nonmetals.
2. Describe the electrochemical series and why it’s important in understanding metals.
3. Describe the theory of ionization in regard to acids and bases.
4. Identify the role of indicators.
Answer:
1. Both metals and nonmetals are types of elements and can be involved in chemical reactions. Some of their differences are highlighted in the chart below.
Metals:
Appearance; Shiny.
Conduct heat or electricity; Yes.
Malleable or ductile; Yes, both and has great mechanical strength.
Form stable compounds; Forms stable compounds with acids; also forms oxides; replaces hydrogen in acids or water; combine with nonmetals; often becomes positive.
Nonmetals :
Appearance; Not shiny .
Conduct heat or electricity; Not well .
Malleable or ductile; Brittle and not easily molded into shapes .
Form stable compounds; Oxides usually give acid reactions in water; often becomes negative
2. The electrochemical series is an arrangement of metals in such order that any metal in the list is displaced from its compounds by any metal above it, but displaces any metal below it. The higher up the list a metal is, the greater its activity. Knowing a metal’s placement on this chart can help you understand the activity of the metal, especially in regard to its ability to displace hydrogen in acids. Any items on the list far above hydrogen will do a good job at displacing it, those near it won’t do such a good job, and those below it won’t displace it from acids at all.
3. When placed in water, acids dissociate and form free hydrogen ions, which determine the properties of acids. The number of hydrogen ions determines the strength of an acid. Strong acids dissociate to a large degree and produce a large number of hydrogen ions. Weak acids dissociate to only a slight degree.
When placed in water, bases dissociate and form free hydroxyl ions, which determine the properties of bases. Strong bases dissociate to a great degree and produce a large number of hydroxyl ions. Weak bases dissociate to only a slight degree.
When free hydrogen ions and free hydroxyl ions are removed from solutions of acids and bases, then the acidic and basic properties disappear. This is what happens when acids and bases are mixed together in proper proportion; the hydroxyl ion will unite with the hydrogen ion to form water. The resulting salt product is neutral.
4. Indicators are used to help determine the pH value of an unknown solution. These are often papers that turn a certain color at certain pH values.
Metals are good conductors of heat and electricity but the non-metals are not.
Compare metals and non-metalsMetals are good conductors of electricity and heat whereas non-metals are poor conductors of heat and electricity. Metals have high density while on the other hand, non-metals have low density. Metals are malleable and ductile whereas non-metals are brittle.
So we can conclude that metals are good conductors of heat and electricity but the non-metals are not.
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What mineral is harder, Calcite or Olivine?
Answer:
olivine im pretty sure
Explanation:
calcite has a hardness number of 3 and calcite has a hardness number of 6.5-7
Phenolphthalein turns litmus paper what color?
Litmus paper and Phenolphthalein are both indicators. This means they will change colour in the presence of an acid or a base.
Litmus paper turns blue in a base and remains red when it is in contact with an acid or neutral solution. Phenolphthalein turns pink in a base, but is coluorless in an acid or neutral solution.
If an object is accelerating the forces acting on the object are ?
Answer:
If an object is accelerating the forces acting on the object are BALANCED.
Explanation
if an object is moving at a constant rate of acceleration, the the forces acting upon it are balanced .
what "waste" does the blood cell drop off at the lungs .... ANSWER ASAP AND I POINT EXTRA
Answer:
it drops off of carbon dioxide... but i believe when the blood returns to the heart it " travels" through the pulmonary veins...
use your brain :) brainliest pweasee?
