Answer:
the relationship between mass and volume
An electric current is produced when ______________________ move continuously batteries magnets electric charges wires
Answer:
electric charges.
Explanation:
Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction.
An electron can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
An electric current is produced when electric charges (electrons) move continuously and it's measured in Amperes through the use of an ammeter.
Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.
Mathematically, Ohm's law is given by the formula;
[tex] V = IR[/tex]
Where;
V represents voltage measured in voltage.
I represents current measured in amperes.
R represents resistance measured in ohms.
A fire is an example of an exothermic reaction. Which of the following best
supports that statement?
A. The fire is creating energy.
B. The fire is releasing energy.
C. The fire is capturing energy.
D. The fire is destroying energy.
Answer: B. Fire is releasing energy
Explanation:
Help needed ASAP, I will mark your answer as brainliest.
Answer:
b
Explanation:
b
If you want to lower water's freezing point 18 degrees C by adding NaCl, what must the molality of the salt solution be? (K(f) for water ris 1.86 degree C/m)
Answer:
4.84 m
Explanation:
To solve this problem we need Frezing point depression.
Formula is: ΔT = Kf . m . i
ΔT = 18°C
This is data. ΔT is the difference, Freezing T° of pure solute - Freezing T° of solution.
Kf = 1.86 °C/m
m = molality. Our unknown.
i = Ions dissolved in solution, also called Van't Hoff factor.
NaCl → Na⁻ + Cl⁻
Sodium chloride can produce 2 moles of ions.
We replace data: 18°C = 1.86 °C/m . m . 2
18°C / (1.86 °C/m) . 2 = m
molality = 4.84
Why is creativity important in scientific investigations?
a. Creative solutions are often needed to solve technical problems.
b. Scientists need to creatively adjust their data to prove their hypothesis.
c. There is no way to test a hypothesis, so creativity is necessary.
d. Most scientific experiments have no data.
Answer:
a. Creative solutions are often needed to solve technical problems.
Explanation:
Science in itself is a voyage of discovery. Scientific investigators focusing on various issues are often working hard to find creative solutions to complex technical problems.
In order to find solutions to all these problems bedeviling humanity, scientific investigators must be quite creative. Creativity is always at the bedrock of finding solutions to the complex technical problems of the world which happens to be the ultimate goal of science.
Hence, creativity is indispensable in scientific investigation and creative solutions are often needed to solve technical problems.
Answer:
a. Creative solutions are often needed to solve technical problems
Explanation:
Scientific investigation is the process using the scientific method which consists of empirical techniques in obtaining answers to question raised and used for driving the investigation
The scientist carrying out the investigation into the new area, is therefore required to be creative in adapting the available resources in answering the questions based on the scientific method
If your end product is 1.5 moles of KMnO4, how many moles of manganese oxide were used in the reaction?
The equation for the production of potassium permanganate is as follows:
2 MnO2 + 4 KOH + O2 → 2 KMnO4 + 2 KOH + H2
You must show all work
Answer:
1.5 moles of KMnO4 will be produced from 1.5 moles of MnO2
Explanation:
The balanced equation of this chemical reaction is
2 MnO2 + 4 KOH + O2 → 2 KMnO4 + 2 KOH + H2
2 moles of MnO2 produces 2 moles of KMnO4
That means 1 moles of KMnO4 will be produced from 1 moles of MnO2
Hence, 1.5 moles of KMnO4 will be produced from 1.5 moles of MnO2
The moles of manganese oxide were used in the reaction is 1.5 moles.
What is stoichiometry?Stoichiometry of any reaction tells about the relative amount of species present before and after the chemical reaction.
Given chemical reaction is:
2MnO₂ + 4KOH + O₂ → 2KMnO₄ + 2KOH + H₂
From the stoichiometry of the reaction, it is clear that same moles of manganese oxide and potassium permanganate is involved in the reaction.
2 moles of KMnO₄ = produce by 2 moles of MnO₂
1.5 moles of KMnO₄ = produce by 2/2×1.5=1.5 moles of MnO₂
Hence, required moles are 1.5 moles.
To know more about moles, visit the below link:
https://brainly.com/question/24631381
When copper (II) chloride reacts with sodium nitrate, NaNO3, copper (II) nitrate, Cu(NO3)2, and sodium chloride are formed. Write a balanced chemical equation for this reaction. Then determine how much sodium chloride can be formed when 15.0 grams of copper (II) chloride react with 20.0 grams of sodium nitrate.
Answer:
CuCl2 + 2NaNO3 → Cu(NO3)2 + 2NaCl
Explanation:
m(NaCl) =m(CuCI2) × 2Mr(NaCl) / Mr(CuCI2)
= 15 × 2 × (94/135)
=20.89 g
Mallory combines two chemicals and notices that each chemical retains its original properties. What did Mallory form?
O a mixture
a compound
an element
an atom
Answer:
A mixture
Explanation:
Why is it important for scientists to use the scientific method?
Answer:
The scientific method attempts to minimize the influence of bias or prejudice in the experimenter. Even the best-intentioned scientists can't escape bias. ... That's the job of the scientific method. It provides an objective, standardized approach to conducting experiments and, in doing so, improves their results.
Answer:
to get used to them
Explanation:
you have to practice them so that they can get into your head
A sample of hydrogen gas collected by displacement of water occupied 30mL at 24 C on a day when the barometric pressure was 736t orr. What volume would the hydrogen occupy if it were dry and at STP? The vapor pressure of water at 24 C is 22.4 torr
Answer:
[tex]v_2=6,48*10^{-4}L[/tex]
Explanation:
From the question we are told that:
Volume of hydrogen [tex]V_1=30mL=>30*10^{-3}[/tex]
Temperature [tex]T_1=24C=>24+273=>297k[/tex]
Pressure of water [tex]P_1=22.4torr=>\frac{22.4}{760}=0.0295atm[/tex]
Let
STP(Standard Temperature and pressure)
[tex]T_2=273K[/tex]
[tex]P_2=1atm[/tex]
Generally the equation for ideal gas is mathematically given by
[tex]\frac{p_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
Therefore
[tex]v_2=\frac{P_1v_1T_2}{T_1P_2}[/tex]
[tex]v_2=\frac{0.0295*30*10^{-3}*273}{297*1}[/tex]
[tex]v_2=6.48*10^{-4}L[/tex] (at STP(Standard Temperature and pressure))
can someone do my watershed project ill give brainly and 80 points
In what sense are photons quantized?
A. Each photon emits more energy than its absorbs
B. Each photon can have multiple frequencies
C. Each photon travels exactly at the same speed of light
D. Each photon has a specific amount of energy
Answer:
Each photon has a specific amount of energy
Explanation:
PLEASE HELP!!!
Two buildings are 21m apart. The height of the taller building is 207m. The angle of depression from the top of the taller building to the top of the shorter building is 15°. Find the height of the shorter building to the nearest meter. (please try to include diagram)
Answer:
dfgdhfjkl;jhgfdsAZXcvdfcgbwegbfgvdavsbhgsvadrfgvrdt
Explanation:
Which of the following is NOT an advantage that can only be gained by the use of digital data transmission instead of analog transmission?
A. Has less static
B. Carries more information
C. Takes up less bandwidth
D. Provides higher resolution images
Answer:
D. Provides higher resolution images
Explanation:
The advantages gained by the use of digital data transmission instead of analog transmission are;
1) Noise do not damage digital signal transmission but they impact on analog signals. Digital signals are therefore more secure than analog signals
2) The bandwidth required for digital signal transmission is much less than the bandwidth required for analog
3) Digital signal allow data transmission to very long distance
4) The rate of transmission with digital signals is higher with digital signals
5) Digital signals allow easy and cost effective methods by which they are replicated
The resolution of an image is a measure of the amount of pixels displayed per inch of the image, such that a high resolution image has more pixel per inch of the image. It is therefore a factor determined at the source of the image based on how much detail is required in an image before transmission
URGENT!!
which has the largest London dispersion force out of the ones listed
what is ionic compounds??
Answer:
The ionic compounds are chemical compounds composed of ions, which is held together by electrostatic forces termed ionic bonding.
How to avoid the process of corrosion?
No Links please.
I needASAP!
Answer:
5 Different Types of Corrosion Prevention Methods
Barrier Coatings. One of the easiest and cheapest ways to prevent corrosion is to use barrier coatings like paint, plastic, or powder. ...
Hot-Dip Galvanization. ...
Alloyed Steel (Stainless) ...
Cathodic Protection. ...
EonCoat.
(05.06 MC)
During an experiment, the percent yield of calcium chloride from a reaction was 85.22%. Theoretically, the
expected amount should have
grams What was the actual yield from this reaction? (5 points)
CaCO3 + HCI - CaCl2 + CO2 + H20
been 113
96.3 grams
О 99.0 grams
113 grams
0 121 grams
Answer:
96.3g is the actual yield from this reaction
Explanation:
Have been 113g...
The percent yield of a reaction is defined as one hundred times the ratio between actual yield (Our incognite) and the theoretical yielf (113g). The equation is:
Percent yield = 85.22% = Actual Yield / 113g * 100
0.8522 = Actual Yield / 113g
0.8522*113g =
96.3g is the actual yield from this reaction
Answer:
96.3
Explanation:
Just took the test
A gas' pressure is 850 torr at 47 degrees. At what temperature will the pressure be 655 torr?
Answer:
From Pressure Law
P1/T1 = P2/T2
Changing our temp to kelvin
T1 = 47 +273 = 320K
We're looking for T2
Making T2 the subject
T2 =P2 x T1 / P1
= 655 x 320/850
T2 = 246K
A gas occupies a volume of 2.50 L at a pressure of 350.0 kPa. If the temperature remains
constant, what volume would the gas occupy at 1750 kPa ?
1. 12.5 L
2. 5.00 L
3. 1.40e+2L
4. 0.500 L
Answer:
V₂ = 0.5 L
Explanation:
Given that,
Initial volume, V₁ = 2.5 L
Pressure, P₁ = 350 kPa
New pressure, P₂ = 1750 kPa
We need to find the new volume if the temperature remains constant. The mathematical relation between P and V is :
[tex]P\propto \dfrac{1}{V}\\\\or\\\\\dfrac{P_1}{P_2}=\dfrac{V_2}{V_1}[/tex]
Where
V₂ is new volume
So,
[tex]V_2=\dfrac{P_1V_1}{P_2}\\\\V_2=\dfrac{350\times 2.5}{1750}\\\\V_2=0.5\ L[/tex]
So, the new volume is equal to 0.5 L.
PLS HELP NO LINKS PLS
Fill in the blank. One chlorine atom from one molecule of chlorofluorocarbon can destroy up to _____ ozone molecules.
100
100,000
10,000
50
Answer:
100,000 Ozone Molecules
Explanation:
I just found this online calculator that got the answer.
Answer:
100,000 is correct
Explanation:
This unknown element could most likely be a part of which of the following
familles?
A Alkall metals
B Alkaline earth metals
C Halogens
D Noble Gases
Answer:
halogen
Explanation:
because the lewis dot structure shows 7 dots which means 7 valence electron. halohe falls on group 17 or7A having 7 valence electron
How many grams are in 3.14 moles of PI₃?
Answer:
[tex]\boxed {\boxed {\sf 1290 \ g \ PI_3}}[/tex]
Explanation:
We want to convert from moles to grams, so we must use the molar mass.
1. Molar MassThe molar mass is the mass of 1 mole of a substance. It is the same as the atomic masses on the Periodic Table, but the units are grams per mole (g/mol) instead of atomic mass units (amu).
We are given the compound PI₃ or phosphorus triiodide. Look up the molar masses of the individual elements.
Phosphorus (P): 30.973762 g/molIodine (I): 126.9045 g/molNote that there is a subscript of 3 after the I in the formula. This means there are 3 moles of iodine in 1 mole of the compound PI₃. We should multiply iodine's molar mass by 3, then add phosphorus's molar mass.
I₃: 126.9045 * 3=380.7135 g/mol PI₃: 30.973762 + 380.7135 = 411.687262 g/mol 2. Convert Moles to GramsUse the molar mass as a ratio.
[tex]\frac {411.687262 \ g \ PI_3}{ 1 \ mol \ PI_3}[/tex]
We want to convert 3.14 moles to grams, so we multiply by that value.
[tex]3.14 \ mol \ PI_3 *\frac {411.687262 \ g \ PI_3}{ 1 \ mol \ PI_3}[/tex]
The units of moles of PI₃ cancel.
[tex]3.14 *\frac {411.687262 \ g \ PI_3}{ 1 }[/tex]
[tex]1292.698 \ g\ PI_3[/tex]
3. RoundThe original measurement of moles has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tens place.
1292.698The 2 in the ones place tells us to leave the 9.
[tex]1290 \ g \ PI_3[/tex]
3.14 moles of phosphorous triiodide is approximately equal to 1290 grams of phosphorus triodide.
In a bakery shop, a chef bakes a cake in an electric oven. The energy outputted from the oven becomes an input to the cake system.
Which energy form is readily outputted from the oven system?
A. chemical energy
B. electrical energy
C. sound energy
D. thermal energy
What two metals are have atoms larger than that of sodium
Answer: potassium and rubidium
Explanation:
1) The group 1 of the periodic table contain six elements namely Lithium(Li), Sodium(Na),Potassium(K),Rubidium(Rb),Cesium(Cs) and Francium(Fr). These metals are called alkali metals because they form alkalies( i.e. strong bases capable of neutralizing acids) when they react with water.
2) The heavier alkali metals (K, Rb, and Cs) react so vigorously that they invariably explode.
3) This trend, which is not consistent with the relative magnitudes of the reduction potentials of the elements, serves as another example of the complex interplay of different forces and phenomena—in this case, kinetics and thermodynamics.
B 1. What type of signal is represented by discrete values?
A analog
B continuous
C sine wave
D digital
Answer:
digital signal is the answer
A group of students found metamorphic rocks near a campsite. The presence of metamorphic rock is most likely evidence of that the rock formed from .
Answer:
Igneous or sedimentary rocks.
Explanation:
The presence of metamorphic rock is most likely evidence of that the rock formed from igneous or sedimentary rocks. The igneous rock converted into metamorphic rocks when the rock experience intense heat and pressure within the Earth's crust. These metamorphic rocks are crystalline and often have a “squashed” texture. So due to high temperature and pressure, the metamorphic rock is formed from igneous rock.
Which oxide is covalent?
A. AsO2 B. K2O
C. CuO D. ZnO
Answer:
A.
Cu Zn K is are metals which form ionic bond with oxygen
The part of an atom that is responsible for the bonding of atoms is —
A. protons
B. valence electrons
C. neutrinos
D. neutrons
Answer:
B
Explanation:
Valence electrons only involve in chemical bonding, since they are farthest from the nucleus. Hope this helps!
what is the ingredient formula for petroleum
Answer:
(C15H15N)
Explanation: