Drew added yeast and sugar to lukewarm water and placed it in a flask. Drew concluded that the bubbles indicated a chemical change. The correct option is B)
What are chemical changes?A chemical change is a change when the identity of a substance changes, and it converts into a new substance with new characteristics and a new identity.
When iron comes in contact with oxygen, it changes into rust, and it is a chemical change. A chemical change is a transformation in which the substance's chemical composition is altered through atom rearrangement. Atomic alterations cause changes in the molecular structure.
In the reaction, when yeast reacts with lukewarm water it forms bubbles, and in cold water, yeast does not perform well.
Therefore, the correct option is B) the bubbles indicated a chemical change.
To learn more about chemical changes, refer to the link:
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Cu + 2AgNO3 → 2Ag + Cu(NO3)2
How many copper (Cu) atoms are there in Cu(NO3)2?
1. Below is a diagram of an atom. Which particles are found at "A"?
Name three uses for nuclear reactions.
Answer:
Radioisotopes, nuclear power process heat and non-stationary power reactors have essential uses across multiple sectors, including consumer products, food and agriculture, industry, medicine and scientific research, transport, and water resources and the environment.
Explanation:
careful it was copied dont want you to get in trouble for copy right :)
The characteristics of nuclear reactions allow to find some uses:
Fission reactions:
Electric power Radioisotopes Radurizationfusion reactions is development energy production
Nuclear reactions are reactions where atoms are transformed into other atoms, they can be of two types
Fusion. Where light atoms unite to form heavy atoms, this type of process is in the research stage and has no current uses, but in the future it could be a great source of energy. Fission. In this process, unstable heavy atoms are divided into lighter atoms, more stable, this process has several uses today.
Let's describe some of the uses of nuclear fission processes.
Electric power production, this is highly controversial because of very long term radioactive waste. Production of isotopes this process is highly used in industry and medicine Creation by the emitted particles of radioactive elements that are used in industry and medicine.
Radurization processes by which emitted gamma rays kill viruses and bacteria in surgical and medical material mainly, it is also used when transporting vegetables and plants between countries.
In conclusion the characteristics of nuclear reactions we can find the uses:
Electric power Radioisotopes Radurization
Learn more here: brainly.com/question/6572079
How many molecules are in 0.56 moles of NH3?
Answer:
8.9x1023
Explanation:
40 points, please help I seriously cannot fail this class and I am extremely confused. All you have to do is solve using dimensional analysis. If you can type some form of work that would be helpful. I will go answer a question on yours as well also.
Answer:
the answer to the first is 5.5 meters :)
temperature is a measure of the ______ of an object. 1. kelvin 2. insulator 3. average KE 4. radiation 5. specific heat
Answer:
5
Explanation:
Temperature calculates heat/the temperature in the specific location.
What is the function of the urinary system?
Answer:
Explanation:
The Urinary System's function is th filter blood and create urine as a waste by-product
Please give brainliest
Answer:
The urinary system's function is to filter blood and create urine as a waste by-product. The organs of the urinary system include the kidneys, renal pelvis, ureters , bladder and urethra.
I HOPE IT HELPS ❤❤HHHAAAAALLLPPPP
It’s due tomorrow
Answer:
D.
Explanation:
Only 0.0035% of the electromagnetic spectrum is visible to the human eye
Hopefully this helped :)
Are hybrids made by natural selection or artificial selection?
Answer:
natural selection
Explanation:
hybrid incompatibility does not evolve because of direct natural selection for hybrid incompatibility, but is instead a by-product of other evolutionary divergence between the species
2. Which situation best represents conduction?
A. Heat from a campfire
B. A hot air balloon taking off
C. Touching a hot piece of metal
D. Getting sunburned
Answer:
c
Explanation:
touching a hot piece of metal. because the energy or the hotness of the pot is touching your hand which is a direct contact.
when water is pushed out of the way it is said to be____________________.
HELP THIS IS DUE BY 11:59 TONIGHT ITS CURRENTLY LIKE 11:40??
identify: one herbivore, one carnivore, one omnivore, and one decomposer.
herbivore: cow
carnivore: lion
omnivore: bear
decomposer: water mold
Answer:
rabbit, kingfisher,lizard, fungi
Explanation:
hrbivore is an organism which feeds on plants. carnivore is also an organism that feeds on other organism. omnivore is also an organism that feeds on other organisms. Decomposers arsle organisms that recycle nutrients.
Which element tends not to react with other elements?
A
xenon
B
hydrogen
C
phosphorous
D
potassium
Answer:
I believe the answer is Xenon since it is a noble gas
Answer:
I think the answer is A
Explanation:
If im wrong the answer is C
Write 0.000 000 000 402 000 in scientific notation.
Answer:
0.000000000402000 in scientific notation is 4.02000 × 10-10
How do you test for starch in green plant
Answer:
1,Iodine solution is used to test leaves for the presence of starch. ...
2.After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black.
3.The leaf on the left is a variegated leaf
Explanation:
Answer:
1.Iodine solution is used to test leaves for the presence of starch. ...
2.After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black.
3.The leaf on the left is a variegated leaf.
In which directions does liquid pressure act
1) A container has 5 moles of a gas at a pressure of 9.6 atm and a volume of 2.5 liters, what is the temperature?
Q.3.Which of the following chemical reactions is an acid-base reaction?
a. 4 C5H90 (1) + 29 02 (9) - 20 CO2 (g) + 18 H20 (9)
b. Ca (s) + F2 (g) - CaF2 (s)
c. HBr (aq) + NaOH(aq) - H20 (1) + NaBr (aq) O
d. 3 Pb (s) + 2 H3PO4 (aq) - 3 H2 (g) + Pb3(PO4)2 (aq)
Help me out please I'll make you brainliest answer
Answer:
C
Explanation:
Hbr is acidic
NaOH is a base
plus u get a salt from this equation as well as water
thank me later kid
TEST QUESTION PLS HELP What are isotopes? Write isotopes of three different elements, showing their atomic number and mass number. (I'll give brainliest)
Answer:
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element's atomic number on the Periodic Table
Explanation:
Hope this helps some? :)
5. What energy transformations take place in a simple electric motor?
B. kinetic --> electric
O C. electrical --> kinetic
D. light --> electrical
A. chemical --> solar
Answer:C. electrical --> kinetic
Explanation:
an electric motor converts electrical energy into mechanical energy through the process of electromagnetic induction
Answer:
C
Explanation:
the electric motor converts the electrical power to mechanical power ..
What are the units for speed
A. m/s
B. km/s ^ 2
C. m/s^2
D. m^2/s^2
m/s is the correct answer of them.
mixture is a
Pek the word that best completes the following sentence. A
mixture in which the composition is uniform throughout the mixture.
homogeneous
heterogeneous
compound
Need at
Answer:
compund
Explanation:
i took the quiz
When molybdate (MoO3) and Zinc (Zn) are heated together they react in this equation:
3Zn + 2MoO3 → Mo2O3 + ZnO
What is the mole ratio of Zn to Zno?
Answer: The mole ratio of Zn to ZnO is 3: 3.
Explanation:
According to law of conservation of mass, mass can be neither be created nor be destroyed. The mass on reactant side must be equal to the mass on product side. Thus the atoms of each element on both side of the reaction must be same.
The balanced chemical reaction is:
[tex]3Zn+2MoO_3\rightarrow Mo_2O_3+3ZnO[/tex]
Here 3 moles of Zn combine with 2 moles of [tex]MoO_3[/tex] to give 1 mole of [tex]Mo_2O_3[/tex] and 3 moles of [tex]ZnO[/tex]. Thus the mole ratio of Zn to ZnO is 3: 3.
PLEASE HELP IM FAILING AND TODAY IS THE LAST DAY!! PICTURE PROVIDED!!
In your graph, which variable went on the x-axis? Which variable went on the y-axis? Explain why for both.
Answer:
Since the trials depend on the number of shakes, trials is the DEPENDENT VARIABLE and shakes is the INDEPENDENT VARIABLE as something depends on it.
Independent is on the X axis
Dependent is on the Y axis
What Period # is this element found in? P
How does oxygen become an ion with a -2 charge?
A. they gain two electrons
B. they lose two electrons
C. they share two electrons
Answer:
they gain two electrons
Explanation:
because they gain negativity :)
How would you create a positive charge?
Answer:
When electrons are transferred to or removed from an object.
Explanation:
Because electrons have a negative charge, when they are added to an object, it becomes negatively charged. When electrons are removed from an object, it becomes positively charged.
How many mols is 8.86 x 1023 atoms of silver?
Answer:
1.44moles
Explanation:
Given parameters:
Number of atoms = 8.86 x 10²³atoms
Unknown:
Number of moles = ?
Solution:
From the mole concept;
Number of moles = [tex]\frac{number of atoms }{6.02 x 10^{23} }[/tex]
Number of atoms = 8.86 x 10²³atoms
Number of moles = [tex]\frac{8.68 x 10^{23} }{6.02 x 10^{23} }[/tex]
Number of moles = 1.44moles
Realice las siguientes conversiones: a) 72°F a °C, b) 213.8°C a °F, c)180°C a K, d) 315K a °F, e) 1750°F a K, f) 0K a °F.
Answer:
a) 72 °F= 22.22 °C
b) 213.8 °C= 416.84°F
c) 180 °C= 453.15 °K
d) 315 °K= 107.33 °F
e) 1750 °F= 1227.594 °K
f) 0 °K= -459.67 °F
Explanation:
Para realizar el intercambio de unidades debes tener en cuenta las siguientes conversiones:
Fahrenheit a Celsius: [tex]C=\frac{F-32}{1.8}[/tex]Celsius a Fahrenheit: °F= °C*1.8 + 32Celsius a Kelvin: °K= °C + 273.15Kelvin a Fahrenheit: F= (K -273.15)*1.8 + 32Fahrenheit a Kelvin:[tex]K=\frac{F-32}{1.8} + 273.15[/tex]Entonces se obtiene:
a) 72 °F= [tex]\frac{72-32}{1.8}[/tex]=22.22 °C
b) 213.8 °C= 213.8*1.8 + 32= 416.84°F
c) 180 °C= 180°C + 273.15= 453.15 °K
d) 315 °K= (315 -273.15)*1.8 + 32= 107.33 °F
e) 1750 °F= [tex]\frac{1750-32}{1.8} + 273.15[/tex]= 1227.594 °K
f) 0 °K= (0 -273.15)*1.8 + 32= -459.67 °F
What is the molecular formula for CH2 with molar mass 90 g/mol?
Answer:
CH2: (1×12g/mol)+(2×1g/mol)=14 g/mol.
