Answer:8.334×10^-6 moles
Explanation:
a mole is 6.023×10^23
5.02×10^18 ÷ 6.023×10^23=8.33×10^-6
Please help me, trying to get all my hw done
Answer:
C. size and shape
Explanation:
Physical properties such as size, shape, color, density, magnetism or the
ability to sink or float can be used to separate the substances in a mixture..
Filtration is when matter is passed through a filter and the larger particles
are separated out. Magnets can be used to separate magnetic matter from
non-magnetic matter in a mixture. Objects that float when placed in water
can be separated from those that don’t by placing the mixture in water.
Find the molar mass of iron (III) nitrate, Fe(NO3)3
Answer:
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Why does higher temperature increase the reaction rate?
Select one:
The molecules will have higher kinetic energy for higher velocity collisions.
O b. Increasing the temperature causes the reactant molecules to get hotter.
O c. The activation energy will decrease.
O d. Increasing the temperature causes the potential energy in the bonds to decrease.
Check
Answer:
a
Explanation:
Answer:
Im pretty sure it's B, almost 100% sure
Explanation:
Do cells have atoms?
Answer:
Ye? everything is made up of atoms so sure
What is the source of energy in nuclear weapons?
O A. Combustion
O B. Fusion
O C. Gravity
O D. Fission
Answer:
D. Fission
Explanation:
Induced fission is used to generate nuclear power and for weapons. The products formed during fission gain kinetic energy. It is this energy that is harnessed in nuclear power stations.
A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material?.
The question that will best help the student to classify the material is; "is the material malleable or ductile?"
Generally, materials can be classified as metals or non metals. There are properties that are particular to metals and there are properties that are particular to nonmetals and these properties can be used to identify each one of the materials.
The question that will best help the student to classify the material is; "is the material malleable or ductile?" These metallic properties.
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Missing parts;
A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material? A. Is the material malleable or ductile? B. Does the material feel hard to the touch? C. Will the material float in water? D. Does the material feel rough or smooth?
______= Speed / Wavelength
Answer:
Frequency
Explanation:
It’s kinda self-explanatory but bascially speed=wavelength times frequency
Answer:
Frequency is Speed divided by Wavelength
Step-by-step explanation:
Don't think there needs to be an explanation for the formula, unless you want the conceptual understanding
How much heat is required to warm 50.0 g of ice from -10.0oC to 0.00oC, melt the ice, warm the water from 0.00oC to 100.0oC, boil the water, and heat the steam to
120.0oC ?
a 209,000 J
b 199,000 J
c 1.67 x 106 J
d 152,000 J
The total heat required to convert the ice to steam is 155,000 J.
The given parameters:
Mass of the ice, m = 50 gInitial temperature of the ice, t = -10 ⁰CFinal temperature of the ice, T = 0⁰C, 100⁰C and 120⁰CSpecific heat capacity of water = 4.184 J/g⁰CHeat of fusion of ice, = 333.55 J/gHeat of vaporization, = 2,230 J/gThe heat required to raise the temperature to 0⁰C is calculated as;
[tex]Q = mc\Delta t\\\\Q_1 = 50 \times 4.184 \times (0 - (-10))\\\\Q_1 = 2092 \ J[/tex]
The heat required to melt the ice is calculated as follows;
[tex]Q_2 = mL_f\\\\Q_2 = 50 \times 333.55 \\\\Q_2 = 16,677.5 \ J[/tex]
The heat raise the temperature to 100⁰C is calculated as;
[tex]Q_3 = 50 \times 4.184 \times (100 - 0)\\\\Q_3 = 20,920 \ J[/tex]
The heat required to boil the water is calculated as follows;
[tex]Q_4 = mL_v\\\\Q_4 = 50 \times 2230\\\\4_4 = 111,500 \ J[/tex]
The heat raise the temperature to 120⁰C is calculated as;
[tex]Q_5 = 50 \times 4.184 \times (120 - 100)\\\\Q_5 = 4,184 \ J[/tex]
The total heat required is calculated as follows;
[tex]Q_t = Q_1 + Q_2 + Q_3 + Q_4 + Q _5 \\\\Q_t = 2092 + 16,677.5 + 20,920 + 111,500 + 4,184\\\\Q_t = 155,373.5 \ J\\\\Q_t \approx 155,000 \ J[/tex]
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As atoms get smaller,valance electrons are getting closer or farther away from the nucleous.The force of attraction is stronger o weaker so it takes more or lesss energy to remove electrons?
Explanation:
Electrons are closer to the nucleus are in filled orbitals and are called core electrons. More energy which in nucleus called nuclear strOng energy to remove electron thars why its also a way harder too..
why is it hotter in the summer and colder in the winter?
Answer: During the summer, the sun's rays hit the Earth at a steep angle. ... Also, the long daylight hours allow the Earth plenty of time to reach warm temperatures. During the winter, the sun's rays hit the Earth at a shallow angle. These rays are more spread out, which minimizes the amount of energy that hits any given spot.
Which of the following is true of grinding during
digestion?
A. The process of grinding is a physical change
that takes place in the mouth during digestion.
B. The process of grinding is a chemical change
that takes place in the mouth during digestion.
C. The process of grinding is a physical change
that takes place in the small intestine during
digestion
D. The process of grinding is a chemical change
that takes place in the small intestine during
digestion
The process of grinding is a physical change that takes place in the mouth during digestion.
GRINDING:Grinding is one of the processes that occur during the digestion of food molecules into simpler substances.
Grinding of food molecules occurs in the mouth with the aid of the teeth, which is used to chew.
However, the process of grinding is a physical change because it does not result into the formation of new substances or change the chemical constituents of the food.
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Formulate a hypothesis based on something recently observed.
And How could this hypothesis be tested?
Answer:
If garlic repels fleas, then a dog that is given garlic every day will not get fleas. Bacterial growth may be affected by moisture levels in the air. If sugar causes cavities, then people who eat a lot of candy may be more prone to cavities.
Explanation:
Which of the following compounds has the general formula X3Y2?Which of the following compounds has the general formula X3Y2?
There are no above options to choose from so I am giving an example of a X3Y2 formula which is Magnesium nitride, the formula is Mg3N2.
How many molecules of NO2 are in 0.36 moles?
Answer:
1 mol contains 6.022*10^23 molecules 0.36 moles contain 0.36 * 6.022*10^23 = 2.2 *10^23 molecules
Explanation:
PLEASE help in the middle of a test: When table salt forms, which action occurs between the reacting elements?(1 point)
Answer:
don't know if this is what your looking for but it might be a NEUTRILIZATION REACTION.
Answer:
i think its sodium donates an electron to chlorine
Explanation:
What is a Chemical Properties and Physical Properties? Please tell me the deffinition of them both.
Answer:
All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive. ... Physical properties can be measured without changing a substance's chemical identity. Chemical properties can be measured only by changing a substance's chemical identity.
Explanation:
explain a mixture of molecules
Answer:
A mixture of molecules is a group of molecules in which there are multiple different elements and atoms, that are in either fixed proportions or random. There are heterogeneous and homogenous mixtures.
Explanation:
Who thought fire was one of four elements?
O A. Aristotle
O B. Marie Curie
O C. John Dalton
O D. Robert Boyle
Answer:
D Robert Boyle
Explanation:
Find the percent composition of OXYGEN in Manganese (III) nitrate, Mn(NO3)3.
Answer:
59.8%
Explanation:
First find the Mr of manganese (III) nitrate.
Mr of Mn(NO₃)₃ = 54.9 + (14 × 3) + (16 × 3 × 3) = 240.9
Since we have to find the percentage composition of oxygen, we need to find the Mr of oxygen in the compound, which is:
Mr of (O₃)₃ = (16 × 3) × 3 = 144
Now we can find percentage composition / percentage by mass of oxygen.
% composition = [tex]\frac{Mr\ of\ oxygen\ in\ compound}{Mr\ of\ compound}[/tex] × 100
% composition = [tex]\frac{144}{240.9}[/tex] × 100 = 59.776%
∴ % compostion of oxygen in maganese(III)nitrate is 59.8% (to 3 significant figures).
Why weren’t scientists initially concerned that the ocean absorbs excess carbon dioxide?
Why scientists weren’t initially concerned that the ocean absorbs excess carbon dioxide was because they saw carbon dioxide as a pollutant
What is a pollutant?Generally, A pollutant is a material found in amounts that are harmful to organisms or exceed an environmental quality standard.
In conclusion, scientists saw carbon dioxide as a major air pollutant, and the water was helping by absorbing it.
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Write the complete electron configuration using the diagonal rule for strontium.
what is the nature of the p-o bond in phosphorus pentoxide (p2o5)?
Answer:
the nature of the bond is covalent.
covalent bonds are bonds between 2 NON-METAL elements. since phosphorus and oxygen are both non-metals, the bond formed between them is covalent.
hope this answers your question!
Which objects refract light? (Select all that apply.)
the human eye
contact lenses
a magnifying glass
concave mirrors
"uses for simple machines" whats a piano that needs to be moved up to a third floor apartment
Answer:
Pulley
Explanation:
You can't the piano up the stairs, you need to something to bring it up
How many grams of CO2 should be placed in a 250 mL container and -24°C to produce a pressure of 95K PA?
Answer:
About 0.53 g of carbon dioxide needs to be added.
Explanation:
Recall the ideal gas law:
[tex]\displaystyle PV = n RT[/tex]
To determine the amount of carbon dioxide we need, we need to solve for n:
[tex]\displaystyle n = \frac{PV}{RT}[/tex]
Recall that P, V, and T are in atm, L, and K, respectively. R is the universal gas constant.
Convert all values into the correct units:
Volume:
[tex]\displaystyle 250\text{ mL } \cdot \frac{1 \text{ L}}{1000 \text{ mL}} = 0.25 \text{ L}[/tex]
Temperature:
[tex]\displaystyle \begin{aligned} K & =( ^\circ C) + 273.15 \\ \\ & = (-24) + (273.15) \\ \\ & = 249 \text{ K}\end{aligned}[/tex]
And pressure:
[tex]\displaystyle 95 \text{ kPa} \cdot \frac{1.00 \text{ atm}}{101.3 \text{ kPa}} = 0.94 \text{ atm}[/tex]
Substitute and evaluate:
[tex]\displaystyle\begin{aligned} n & = \frac{\left(0.94 \text{ atm}\right)\left(0.25 \text{ L}\right)}{\left(\dfrac{0.08206 \text{ L-atm}}{\text{mol-K}}\right)\left(249\text{ K}\right)} \\ \\ & = 0.012 \text{ mol CO$_2$}\end{aligned}[/tex]
Convert moles to grams:
[tex]\displaystyle 0.012 \text{ mol CO$_2$} \cdot \frac{44.01 \text{ g CO$_2$}}{1 \text{ mol CO$_2$}} = 0.53 \text{ g CO$_2$}[/tex]
In conclusion, about 0.53 g of carbon dioxide needs to be added.
If the temperature changes by 100 K, by how much does it change in degrees Celsius?
A. 0 degrees Celsius
B. 100 degrees Celsius
C. 37 degrees Celsius
D. 273 degrees Celsius
Taking into account the degrees Celsius and Kelvin, if the temperature changes by 100 K, by 100 degrees Celsius it change in degrees Celsius.
A degree Centigrade is a unit of temperature (the physical quantity that reveals the level of heat) whose symbol is °C.
On the other hand, the degree Kelvin, whose symbol is K, is the unit of temperature on the scale created by William Thomson Kelvin, in 1848, based on the degree Celsius, he established his zero point (0) at zero absolute (-273.15 ° C). The figure 0 K is equivalent to the theoretical point where gases have no volume. Absolute zero or 0 K is the point where molecules theoretically stop moving. It is the "perfect" cold.
Considering that zero on the Celsius or degrees centigrade (0 ° C) scale is defined as the equivalent of 273.15 K, the conversion from degrees ° C to K is carried out using the following expression:
T(K)= T(°C) + 273.15 K
In this case, if the temperature changes by 100 K, as it is a change in temperature, the numerical value in K units is the same in ° C units.
Then, the correct answer is option B. if the temperature changes by 100 K, by 100 degrees Celsius it change in degrees Celsius.
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https://brainly.com/question/2800860?referrer=searchResultsIs a change in color when combining two substances normally a sign of a chemical change or a physical change?
Answer:
Change in colour is a chemical change.
Explanation:
Because when two substances combine chemically, they create (a) new substance(s) that have/has different molecular structures from the parent substances, thus mostly likely absorb and reflect light in different ways.
100 ml of nitrogen collected at 27 degree celcius cooled to -73 degree celcius at same pressure.calculate the contraction in volume.
Explanation:
P1. V1/T1 = P2. V2/T2
Apply this
since here, P1 = P2
100 ml / 300 = V2/ 200
==> 100*200/300 = V2
===> V2 = 66.66 ml
Which choice describes an organism found in the under story of a rain forest?
thick, woody vines
bacteria
very tall trees
palms and other small trees
Answer:
Palms and other small trees
The choices which describes an organism found in the under story of a rain forest are bacteria, thick and woody vines.
What is under story of a rain forest?The understory is a layer of young trees, short species of trees, shrubs, and soft-stemmed plants that lies several meters beneath the canopy's bottom. The understory differs greatly from one rainforest to the next.
The organism that is found in the under story of a rain forest is bacteria and very small plants, thick and woody vines.
Hence organism that is present in the understory are bacteria, thick and woody vines.
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how many structures are possible for a square planar molecule with a formula of ax3y?
Answer:
Explanation:
Depending upon the relative arrangements of XandY X a n d Y , the square planar molecule AX3Y A X 3 Y shows only the following structure: Hence, only one structure is possible for a square planar molecule with a formula of AX3Y A X 3 Y .