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.
What is the charge of a Li
ion?
Answer:
4.2 volts per cell.
Explanation:
simplify 2²×2³ someone plz help
Answer:
[tex]2^5[/tex] or 32
Explanation:
The rule for exponents is that [tex]x^a*x^b = x^{a+b[/tex]. Thus, we have a+b = 5 so the answer is 2^5 or 32
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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.
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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:
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Answer: i would say the first one
Explanation:
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
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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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
give five differences between physical and chemical change
To change an object from a liquid to a gas _________ must happen
melting
evaporation
sublimation
condensation
You performed an experiment in which you measured the amount of water
leaking through different types of roofs. For one roof, you measured a volume
of 3.4 gallons. What is this measurement in Sl units? 1 gal = 3.78 L.
A. 5.3 L
B. 8.7L
C. 2.5 L
O D. 12.9 L
Answer:
D. 12.9 L
Explanation:
Gallon and litter are unit of volume.
Gallon is bigger unit than liter.
1 gallon = 3.78 L
We will convert the gallon into litter by multiplying the given value with 3.78.
3.4 gal × 3.78 L/ 1 gal
12.9 L
Thus, option D is correct.
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
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)
You find an old gold ring in your house. You are sure it is gold but you do not know what
karat it is. After chemistry class you determine the mass and volume of the ring. You
determine its mass is 14.3 g and its volume is 0.808 g. Next calculate the density of the ring and determine what karat gold it is.
Can someone me with this question plz
Answer:
find how much gold weighs by volume based on the karat and factor that in to find the answer
Explanation:
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
how hot is the sky and why is rain not salty
Answer & Explanation:
The sky temperature is just above freezing (34 degrees Fahrenheit or 1 degree Celsius).
The water molecules are sticky and they stick to other water molecules because they are what's called dipole molecules, when you give enough energy to the water molecule, it can break the bonds to the other water molecules, holding it into the water, and it can escape as water vapour. Clouds that bring rain are built up by vapor. The heat of the sun evaporates seawater and produces vapor. The water in the ocean collects all of the salt and minerals from all of the rivers that flow into it.
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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Which of the following statements describes a difference between a chemical change and a physical change in a substance
Explanation:
A physical change is one that alters the physical properties of matter (particularly the form and state).
A chemical change is one in which new kind of matter is formed. It is always accompanied by energy changes (evolution or absorption of energy in form of heat or light or both).
Now, the salient differences between physical and chemical changes;
Physical changes are easily reversible whereas chemical changes are not easily reversible. Physical changes lead to the production of no new kinds of matter whereas chemical changes leads to the production of new kinds of matter. Physical changes involves no change in mass whereas chemical changes involves change in mass. Physical changes require little energy whereas considerable amount of energy is needed for chemical changes.Answer:
The result of a chemical change is a different composition and is often hard to reverse; in a physical change, the composition remains the same and is often easy to reverse.
Explanation:
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.
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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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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:
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Answer:
your dad and i don't care if i have been warned
Explanation:
he left for some milk
Which observable property of a star is indicative of the star's surface temperature?
O color
O shape
O speed
O brightness
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
organisms which contain only one cell are?
Answer:
bacteria, protists, and yeast.
Explanation:Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. Unicellular organisms
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
A mass of mercury occupies 0.950L. What volume would an equal mass of ethanol occupy? The density of mercury is 13.546g/mL and the density of ethanol is 0.789g/mL
Answer:
16.3 L
Explanation:
volume of mercury = 0.950 L
density of mercury = 13.546 g/ml
and density of ethanol = 0.789 g/ml
From the given density and volume we will calculate the mass of mercury and then there would exactly same mass of ethanol be there as is mentioned.
we know that, mass = volume x density
So, mass of mercury = 0.950 L x (1000ml/1L) x (13.546g/ml) = 12868.7g
Now we have mass and density of ethanol so it's volume could easily be calculated as volume = mass/density
volume of ethanol = 12868.7g x (1ml/0.789ml) x (1L/1000ml) = 16.31 L
red is kinda sus today
Answer:
he do be lookin sus
Explanation:
Answer:
yeah
Explanation:
d
What is our solar System inside
Answer:
The milky waY is the answer
Explanation:
the percent composition of calcium is ?
Answer:
36%
Explanation:
This is the answer on edmentum/plato. Hope this helps. Jesus loves YOU!
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...
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