Answer:
B. Protons
Explanation:
The atomic number or proton number of a chemical element is the number of protons found in the nucleus of every atom of that element.
Answer:
protons
Explanation:
It is best to say that electric motors require _______ to work. a. a continuous current b. a galvonometer c. a generator d. energy
If there is enough energy and H2, then how many moles of Sn02 will react with 2 moles of H2 and produce 1 mole of Sn and 2 moles of H2O? How many moles of SnO2 does this balanced equation represent?
Answer:
One mole of SnO2
Explanation:
SnO2(s) + 2H2(g) ------> Sn(s) + 2H2O(l)
In every question that has to do with stoichiometry, the balanced reaction equation is the first step towards obtaining the correct answer because it serves as a guide in solving the question.
From the balanced reaction equation, we have
1 mole of SnO2 reacts with 2 moles of hydrogen gas to yield two moles of water.
The balanced reaction equation represents one mole of SnO2.
Hence the answer.
How many grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide at 901 mmHg and 0'C?
26.3 grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide at 901 mmHg and [tex]0^0C[/tex]
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 901 mm Hg = 1.18 atm (760 mm Hg = 1 atm)
V = Volume of gas = 5.00 L
n = number of moles = ?
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]0^0C=(0+273)K=273K[/tex]
[tex]n=\frac{PV}{RT}[/tex]
[tex]n=\frac{1.18atm\times 5.00L}{0.0821L atm/K mol\times 273K}=0.263moles[/tex]
The chemical reaction for the decomposition of calcium carbonate follows the equation:
[tex]CaCO_3(s)\rightleftharpoons CaO(s)+CO_2(g)[/tex]
According to stoichiometry:
1 mole of carbon dioxide is produced by = 1 mole of calcium carbonate
Thus 0.263 moles of carbon dioxide is produced by = [tex]\frac{1}{1}\times 0.263=0.263[/tex] moles of calcium carbonate
Mass of calcium carbonate=[tex]moles\times {\text {Molar mass}}=0.263mol\times 100g/mol=26.3g[/tex]
26.3 grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide at 901 mmHg and [tex]0^0C[/tex]
Balance the half-reaction in acidic or basic solution then state whether the process is oxidation or reduction. b) CLO4^-1 —> Cl2 c) FeO —> Fe2O3 d)NO3^-1 —> N2O4
Answer:
c
Explanation:
took it
What are the solutions to the equation x2 + 4x + 5 = 0?
Answer:
-1, -4
Explanation:
[tex]x^2+4x+5=0[/tex]
Factoring, you get:
[tex](x+4)(x+1)=0[/tex]
To find what x can be, you need to realize what could make this equation true. To set the left side equal to 0, either one of the terms in parentheses must be equal to 0. To do that, x must be the negative of the other term, so that they can cancel each other out. Therefore, x is -4 and -1. Hope this helps!
Answer:
-1,-4
Explanation:
To build a sustainable multigenerational
civilization, it may be necessary to simulate
Earth's gravity. How will this be possible?
Simulating Earth's gravity in space would be challenging, but it is possible to create artificial gravity using centrifugal force. Centrifugal force is the outward force experienced by an object that is moving in a circle.
What is gravity?An unobservable force that draws things together. Anyone remains on the ground thanks to Earth's gravity, which also causes objects to fall.
One way to create artificial gravity in space is by building a rotating space station. The station would consist of two main parts: a central hub and a rotating section.
The hub would contain the crew quarters, life support systems, and other essential components, while the rotating section would be attached to the hub via a set of cables or other structures.
The rotating section would be set spinning, creating centrifugal force that would push the crew towards the outer rim of the section. This force would create a sensation of gravity that would be similar to that experienced on Earth.
Thus, by rotating a spacecraft, it is possible to create a centrifugal force that mimics the gravitational force of Earth.
To learn more about the gravity, follow the link:
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Which of the following best expresses the definition of a closed system? (2 points) Energy can enter or leave the system but matter cannot. Heat and matter are both able to enter or leave the system. Matter can enter or leave the system but energy cannot. Heat and matter can enter the system but cannot leave the system.
help please place the ph test papers I️n order from most acidic to most alkaline
Answer:refer to the image below
Data
Record your data either in your lab notebook or in the space below.
Time
Radioactive Atoms
0.5"
Half-Life
Minutes
Predicted
Simulated
Cycles, n
Acted out
0.0
100
Initial = 0
100
1
100
0.5
1
2.
1.0
1.5
3
2.0
4
2.5
5
3.0
6
3.5
7
4.0
8
id
Answer:
The 2nd one
Explanation: U answered yourself on the second one
Answer: I don't have the last column though.
Explanation:
the volume of one mole of a substance is 22.4 L at STP for all what
Answer:
The molar volume of a gas is the volume of one mole of a gas at STP. At STP, one mole (6.02 × 1023 representative particles) of any gas occupies a volume of 22.4 L (Figure below). A mole of any gas occupies 22.4 L at standard temperature and pressure (0°C and 1 atm).
Explanation:
4. This metal (X) displaces copper from copper sulphate solution but does not
displace zinc from zinc sulphate. From this we can tell that the order of reactivity
(most reactive first) is
a. zinc; copper; X
b. zinc; X ; copper
c. copper ; X ; zinc
d. X; zinc; copper;
Answer:
Explanation:
B
_____________________________ makes the Sun appear to move across the sky
Answer:
The answer to the question is orbit
What is the answer to this question
2
Explanation:
50/50 chance of getting correct
Which statements describe an ideal gas
Answer:smoke
Explanation:smoke is a gas
Currently, electricity from solar panel systems is cheaper than electricity produced from fossil fuel or nuclear power plants
True
False
Is boiling water a physical change
Answer:
yes ,it is a physical change
Explanation:
because physical change can be reversed which means that boiling water can be reversed back
What might happen if an octopus we're chased by a predator
Answer:
They will try to defend themselves
Explanation:
Answer:
octopuses will shoot a dark liquid, sometimes called ink, at the thing that scared them. ... If an octopus does get caught — no problem. They can lose arms and regrow them.
Explanation:
What do these two changes have in common?
sediment settling to the bottom of a muddy puddle
a puddle freezing into ice on a cold night
Select all that apply.
Both are chemical changes.
Both are changes of state.
Both are caused by heating.
Both are only physical changes.
Answer:
Both are only physical changes
Explanation:
Sediment settling to the bottom of a muddy puddle is a physical change and a puddle freezing into ice on a cold night is also a physical change. Both are only physical changes.
What is Physical change ?Physical changes are those changes in which substance changes physical properties only. Properties like temperature, pressure, shape, color, size, state (solid, liquid and gas). These changes are temporary in nature. In physical change no new substances formed. It is reversible change. Sediment settling to the bottom of a muddy puddle is a physical change and a puddle freezing into ice on a cold night is also a physical change. Both are only physical changes.
What is Chemical change ?Chemical change are those changes in which substance changes chemical composition. These changes are permanent changes. In chemical change new substances formed and in chemical change substances can not get back into its original form. It is irreversible change. Sediment settling to the bottom of a muddy puddle and a puddle freezing into ice on a cold night both are not chemical changes as there is no new substances formed.
Thus, from the above conclusion we can say that Sediment settling to the bottom of a muddy puddle and a puddle freezing into ice on a cold night both are only physical changes.
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how many grams of oxygen are produced if 25.0g of potassium chlorate decomposes according to the reaction 2KCLO3 —-> 2KCL +3O2
Answer:
approximately 15.1 grams.
Explanation:
The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.
change 25 grams of potassium chlorate to moles.
calculate the gram molecular mass of potassium chlorate.
Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.
1 K x 39 grams/mole
+1 Cl x 35.4 grams/ mole
+3 O x 16 grams/ mole
= 122.4 grams / mole Potassium Chlorate
25
122.4
= moles.
2.05 moles of Potassium Chlorate.
There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.
2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.
Find the gram molecular mass of Potassium Chloride.
1 K x 39 = 39
+1 Cl x 35.4 = 35.4
= 74.4 grams / mole.
2.05 moles x 74.4 grams/ mole = 15.2 grams
Hope it helps :)
Answer:
9.79g of O2
Explanation:
So this question you are trying to go from g of KCLO3 to grams of oxygen. There is no direct conversion so you have to utilize multiple process.
[tex]25.0g KCLO3 * \frac{1mol KCLO3}{122.55 gKCLO3} * \frac{3mol O2}{2 mol KCLO3} * \frac{32.00g O2}{1mol O2}[/tex]
=9.79 g of O2
So first you go from g of KCLO3 to moles of KCLO3 by using molar mass of KCLO3. Then you use mol:mol ratio from balanced equation to go to moles of O2, and finally use molar mass of O2 to go to grams of O2.
How do the lengths of day contrast for the summer solstice and winter solstice?
When it is tilted away from the Sun, it is winter in the northern hemisphere. In between we have autumn and spring. The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice. This is the longest day (most daylight hours) of the year for people living in the northern hemisphere.
Using the table on the right, complete each calculation by typing in the correct answer.
13.2L= ? mL
Answer:
13,200 mL
Explanation:
multiply by 1000 to go from L to mL
What are the two major political parties in the United States, now?
Democrats and Republicans
5 uL of a solution is equal to
how many nanoliters?
Answer:
5000 nL
Explanation:
Answer: 5000 nL
Explanation:
how does a heat sink improve cooling inside computers?
Answer:
It does this by using a thermal conductor (usually metal) to carry heat away from the processor into fins that expose a high amount of surface area to moving air. This allows the air to be heated, thus cooling the heat sink and the processor as well.
A solution having a pH of zero is neutral.
Answer:
This is False.
Explanation:
Acid=0-6
Neutral=7
Base=8-14
How many moles of H3PO4 are produced when 71.0 g P4O10 reacts completely to form H3PO4?
P4O10(s) + H2O(l) → H3PO4(aq)
Answer:
1.00 mol
71.0g P4 0 10 1mol p4 0 10 4 moles H3 PO4
____________ x ___________ x ______________
1 283.886g P4 0 10 1mol P4 0 10
= 1.00 moles H3 PO4
1.00 moles of H₃PO₄ are produced
Given:
Mass of P₄O₁₀ = 71.0 g
To find:
Moles of H₃PO₄ = ?
Balanced chemical reaction:
P₄O₁₀(s) + H₂O(l) → H₃PO₄(aq)
Molar mass of P₄O₁₀ = 283.866 g or 284 g
Calculation for moles:Number of moles is defined as given mass over molar mass.
[tex]\text{Moles of } H_3PO_4= \frac{71.0 g P_4O_{10}}{1} \times \frac{1 mol P_4O_{10}}{283.886 g P_4O_{10}} \times \frac{4 moles H_3PO_4}{1 mol P_4O_{10}} \\\\\text{Moles of } H_3PO_4= 1.00 mol[/tex]
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What are some of the factors that can affect the equilibrium of a chemical reaction?
Answer: Removing Products, Adding Products, Changes in Volume and Pressure, and Changes in Temperature
what is the molarity of a solution that contains 14.92 grams magnesium oxide (MgO) in 365ml of solution?
a. 1.01 molar solution
b. 1.52 molar solution
c. 11.2 molar solution
d. 87.2 molar solution
Answer:
a. 1.01 molar solution
Explanation:
Now we have to recall the formula;
n= CV
Where
n= number of moles of magnesium oxide
C= concentration of magnesium oxide solution = ???
V= volume of magnesium oxide solution= 365 ml
But;
n= m/M
Where;
m= given mass of magnesium oxide= 14.2 g
M= molar mass of magnesium oxide= 40.3044 g/mol
Substituting values;
14.2g/40.3044 g/mol = C×365/1000
0.3523= 0.365 C
C= 0.3523/0.365
C= 0.965
C= 1.00 molar (approx)
Answer:
Option A. 1.01 molar solution
Explanation:
Step 1:
Data obtained from the question. This include the following:
Mass of MgO = 14.92g
Volume of solution = 365mL
Molarity of solution =.?
Step 2:
Determination of the number of mole present in 14.92g of MgO.
This is illustrated below:
Mass of MgO = 14.92g
Molar mass of MgO = 24.3 + 16 = 40.3g/mol
Number of mole MgO =...?
Mole = Mass /Molar Mass
Number of mole of MgO = 14.92/40.3 = 0.370 mole
Step 3:
Determination of the molarity of the solution.
This can be obtained as follow:
Mole of MgO = 0.370 mole
Volume = 365mL = 365/1000 = 0.365L
Molarity =..?
Molarity = mole /Volume
Molarity = 0.370/0.365
Molarity = 1.01M
What is toxicity? Give an example of something from your home.
Answer:
Toxicity is how much something can harm you, like poison. A quick example of this is rat poison. You can put it in traps to kill rats, but if you ingest it it'll also kill you. Also, tide pods are perhaps a more relevant example.
please help w #64
what type of chemical reaction is it?
Answer:
Complete ionic equation
Explanation:
For every reaction, we could write the molecular equation as well as the ionic equation. The net ionic equation only shows the reaction of the main ions that take part in the reaction. It does not show the reaction of spectator ions.
In order to write the complete ionic equation for any reaction, we must observe the following steps;
We have to start by writing a balanced molecular equation for that particular reaction. Secondly, we split up the soluble strong electrolytes solutions into their constituent ions. It is necessary to indicate the correct formula and charge for each ion participating in the reaction. The individual stoichiometric coefficients of each ion is used toindicate the correct number of all the participating ions. All compounds formed during the reaction are noted with the appropriate symbols (s) for solid, (l) for liquid, or (g) for gaseous respectively.