Answer:
A
Explanation:
A chemical change started immediately and finished at eight minutes
Answer:
The answer is
A.) A chemical change started immediately and finished
at eight minutes.
Explanation:
What is the frequency, in hertz, of blue light having a wavelength of 4.25 x 10-?m? Your answer should be
written without spaces, in scientific notation (x10^#) , and to the hundredths place.
Answer:
7.05*10^16(when wavelength =4.25*10^-9m)
Explanation:
c=wavelength *frequency (f)
i.e. f=c/wavelength =3*10^8/4.25*10^-9=7.05*10^16
how does the structure of atoms (i.e. protons, neutron, and electrons) affect the electric charge of an object or substance.
Electrons contribute greatly to the atom's charge, as each electron has a negative charge equal to the positive charge of a proton. Scientists define these charges as “+1” and “-1. ” In an uncharged, neutral atom, the number of electrons orbiting the nucleus is equal to the number of protons inside the nucleus.:
The volume of a sample of gas measured at 27 °C is 10.0 dm . What is the temperature when the volume is reduced to 9.0 dm at the same pressure?
The second temperature of the sample of gas is 24.3°C
The calculation can be done as follows
T1= 27 °c
T2= ?
V1= 10 dm
V2= 9 dm
V1/T1= V2/T2
10/27= 9/T2
Cross multiply
10 ×T2= 9 × 27
T2= 9 × 27/10
= 243/10
= 24.3 °C
Hence the second temperature is 24.3°C
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Is the following equation balanced? Why or why not?
2H2 +02 → 2H,0
Answer:
Yes
Explanation:
It is balanced because On both sides there are 4 hydrogen atoms and 2 oxygen atoms, or in this case, 2 molecular hydrogens and 1 molecular oxygen, which made hydric acid, aka dihydrogen monoxide, or universally, as water.
Which of the following are NOT SAFE things to do, as we might get an electric shock?
1) Touching the switch of a geyser with dry hand.
2) Standing on a wooden stool to check a plug point.
3) Poking a metal rod into an electrical socket.
4) Touching the water in which an immersion heater is kept.
1 is the answer cuz why not
Answer:Poking a metal rod into an electrical socket.
Explanation:
It is because metal rod can conduct electricity easily. So while poking, the metal rod will conduct electricity and you will get an electrical shock.
What are water and carbon dioxide in the cellular respiration reaction? They are reactants because they are present before the reaction. They are reactants because they are present after the reaction. They are products because they are present before the reaction. They are products because they are present after the reaction.
Answer:
They are products because they are present after the reaction.
Explanation:
A chemical reaction refers to any interaction between two or more chemical species that leads to the formation of new chemical species. The species that interacted with each other are called reactants. They were present before the reaction commenced. The species that were formed after the interaction are called products. They only appear after the reaction.
In cellular respiration, carbon dioxide and water appear after the chemical reactions that take place, hence they are products.
Answer:
They are products because they are present after the reaction.
Explanation:
Are famers better than teachers
Answer:
yes and no
Explanation:
because farmers produce grains
and teachers produce knowledge than
how can we measured them?
Answer:
NO... I THINK... ACCORDING TO ME... BY GAINING KNOWLEDGE BY TEACHER.... WE CAN ABLE TO CHANCE FARMING SYSTEM...
BUT FARMER ONLY DO FARMING...
FOLLOW ME..
Which event is an example of melting?
A. Wet clothes are drying on a clothesline.
B. The outside of a glass of ice water becomes moist.
C. Water drips from an icicle on the edge of a roof.
D. Fog forms in a valley.
SUBMIT
Answer:
C is your correct answer
Answer:
C. Water drips from an icicle on the edge of a roof.
Explanation:
Water dripping form an icicle on the edge of a roof is a clear cut example of melting event.
Melting is a phase change from solid to liquid. It usually occurs when the solid body gains more thermal energy.
Icicles are frozen water; They have a solid stateWhen this ice body melts, drips of water begins to form. We term this melting.5. How many atoms are in 4.5 grams of cobalt (Co)?
Answer:
You can view more details on each measurement unit: molecular weight of Cobalt or grams The molecular formula for Cobalt is Co. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Cobalt, or 58.9332 grams.
Explanation:
Can u see bubbles in chemical reactions
Which is one use for radioactive isotopes?
Answer:
Radioactive isotopes have many useful applications. In medicine, for example, cobalt-60 is extensively employed as a radiation source to arrest the development of cancer. Other radioactive isotopes are used as tracers for diagnostic purposes as well as in research on metabolic processes.
Explanation:
HOPE THIS HELPS !
What conclusion can you draw about the ability of metals to hold on to and attract electrons, as
compared to nonmetals?
Answer:
Metals react by losing electrons. So, there is high reactivity due to lower attraction. Non-metals react by gaining electrons. So, there is high reactivity due to higher attraction.
Explanation:
Metals react by losing electrons. So, there is high reactivity due to lower attraction. Non-metals react by gaining electrons. So, there is high reactivity due to higher attraction. Also, electrons lost by metals transfer to the nonmetals. It is easier for the metals to lose their valance electrons and form cations rather than gaining electrons.
Metals do not hold on to or attract electrons while nonmetals hold on to or attract electrons.
In the periodic table, metals are found towards the left hand side of the table while nonmetals are found towards the right hand side of the table.
Electron affinity of elements increase from left to right across the period. Electron affinity refers to the ability of elements to attract or hold electrons. This ability increase steadily across the period.
Usually, the electron affinity values of nonmetals are very high showing that they easily hold on to and attract electrons while the electron affinity values of metals is very low showing that they do not easily hold on to and attract electrons.
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does the ratio of neutrons to protons affect the stability of the nucleus ?
Bismuth has a density of 9.80 g/cm^3. What is the mass of 3.02 cm^3 bismuth?
Answer:
Now, the problem provides you with the density of bismuth metal, which is said to be equal to 9.8 g cm−3 . This tells you that for every cubic centimeter of bismuth, you get a mass of 9.8 g .
0.764 km to centimeters
Answer: 76400cm
Explanation:
what is the second most common molecule in the body
Answer:
carbon
Explanation:
Answer:
Carbon
Carbon is the second most common molecule in the human body
Iron (Fe) is an effective conductor of heat and electricity. Which other element is MOST likely to
have similar conductivities?
(A) potassium (K)
(B) nickel (Ni)
(C)bromine (Br)
(D) krypton (Kr)
Answer:
B
Explanation:
Conductors are able to conduct electricity and temperature. Most of the metals, metalloids and alloys are conducting. Like iron (Fe) nickel is a good conductor.
What is conductivity?Conductivity is a physical property of substances indicates the ability to conduct heat and electricity. Substances like metals are conductors because of the presence of free electrons in them.
The flow of free electrons in solids make the substance conducting. Substances which does not conduct is called insulators and those which conduct partially is called semiconductors.
Gases and liquids with fewer electrons are not conducting. Thus bromine is not a conductor. Krypton is a noble gas and is not conducting, potassium does not conduct electricity but it is thermally conducting.
Hence nickel (Ni) is the element having similar conductivity of iron. Thus option B is correct.
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3.
_______rock forms when a rock is changed by heat, pressure, or chemical
reactions,
Igneous
Sedimentary
Metamorphic
Chemical
Answer:
Metamorphic, I think
Explanation:
Its Metamorphic because that is changed by heat and pressure
What is the reason for if A=B then 8A=8B
A)Multiplication Property of Equality
B)Reflexive Property of Equality
C)Given
Answer:
A
Explanation:
you multiply both sides by 8 so it stays equal
An alien civilization has different names and symbols for six elements. Place each element in the correct location in the periodic table.
Answer:
The picture
Explanation:
You just have to count the number of valence electrons and place the unknown elements on the periodic table according to their atomic number.
Answer:
Here they are.
Explanation:
I don't really know. Sorry. Hope This Helps, Though! :)
is a compound is made different of
atoms?
Answer:
Yes.A compound is a molecule made of atoms from different elements. All compounds are molecules, but not all molecules are compounds. Hydrogen gas (H2) is a molecule, but not a compound because it is made of only one element.
How many atoms of nitrogen (N) on in (NH3)3PO4
Answer:
i think 3 but im sorry if im wrong
Explanation:
How many formula units of sodium chloride are in 6.25moles?
Answer:
3.76375 * 10 ^24
Explanation:
1 mole of Nacl contains 6.022 * 10^23 Nacl formula units
what is 2 + 2 + 2 -8-9-100
The Answer is:
-111.0
what is the environmental effect of 3NaCl
Answer:
Sodium and chloride ions separate when salts are dissolved in water. The dissolved sodium and chloride ions, in high concentrations, can displace other mineral nutrients in the soil. Plants then absorb the chlorine and sodium instead of needed plant nutrients such as potassium and phosphorus, leading to deficiencies.
Explanation:
the explanation is given inyour answer.
Some power plants burn coal to produce electricity. The energy released from coal being burned is used to change water into steam. The steam spins turbines of large generators that produce electricity. Which energy transformations occur when coal is used to produce electricity?
Answer:
Steam thus released transforms heat energy from burning coal into mechanical energy that in turn spins the turbine engine. The kinetic energy of the spinning turbine does work in a generator and then the generator that turns this work into electric energy.
Explanation:
Power plants burn coal to produce electricity. The energy released from coal being burned is used to change water into steam. Steam thus released transforms heat energy from burning coal into mechanical energy that in turn spins the turbine engine. The kinetic energy of the spinning turbine does work in a generator and then the generator that turns this work into electric energy.
Which of these processes occur when water changes to ice?
Finding evidence to support or disprove
is
how science advances
Answer:
Scientific investigations discover evidence that helps science advance, and the purpose of scientific investigations generally is to test hypotheses. Finding evidence to support or disprove hypotheses is how science advances.
Explanation:
The boiling point of water is 100.0*C, yet a student measured it to be 101.3*C. Calculate the percent error of the student's measurement.
Answer:
Percent error = 1.3%
Explanation:
Given data:
Actual value of boiling point = 100.0 °C
Measured value = 101.3 °C
Percent error = ?
Solution:
Formula:
Percent error = ( Measured value - Actual value / Actual value ) × 100
Now we will put the values in formula.
Percent error = 101.3 °C - 100.0 °C / 100.0 °C × 100
Percent error = 1.3 °C / 100.0 °C × 100
Percent error = 0.013 × 100
Percent error = 1.3%
Thus, percent error is 1.3.
Can some1 please answer these questions
Answer:
the answer of your question is yes