Answer:
Explanation:
i = 7.58 × 10 to the -4 power
j = 4.573 × 10 to the sixth power
k = 3.438 × 10 to the -2 power
h = 5 × 10 to the third power
hope this helps!
how many elements does hydrochloric acid have
Answer:
Hydrogen chloride (HCl), a compound of the elements hydrogen and chlorine, a gas at room temperature and pressure. A solution of the gas in water is called hydrochloric acid.
Explanation:
hoped that helped
6th grade science i mark as brainliest
Answer:
A: 60 hours
Explanation:
Answer correctly for a brainlesit!
What is seen as the moon moves from a new moon to a full moon?
a
The amount of light the moon gets stays constant
b
We see more light and then less light
c
The amount of light the moon is receiving decreases
d
The amount of light we see on the moon is increasing
Answer:
The correct answer would be (d)- The amount of light we see on the moon is increasing
Explanation:
If I got this right then please give me brainliest! If not, let me know the correct answer......:)
What is the element Rao (Hint: it's from the periodic table)
Answer:
The table shows element percentages for RaO (radium oxide).
Element %
O 6.61
Ra 93.39
Explanation:
Hope this helps - good luck ^w
1. Ozone in Earth’s atmosphere is important because it
A)absorbs harmful pollution.
B)absorbs harmful radiation.
C)helps clouds form.
D)causes rain to fall.
2.
A. a
B. b
C. c
D. d
Answer:
B
Explanation:
Which element has 47 protons?
Answer:
silver
Explanation:
**Please Help** -
why is the equation 3HCl + Al = AlCl3 + H2 unbalanced?
Answer:
because its supose to be 3HCL+3AL___3ALCL+H³
Write the symbol of each neutral element based
on its Noble Gas Shorthand configuration:
Answer:
1. Co
2. C
3. Ba
Explanation:
what is the ka for a 0.25 m solution of a monoprotic weak acid with a ph of 4.65
Answer:
ka = 2x10⁻⁹
Explanation:
Using the pH we can calculate the molar concentration of H⁺, [H⁺]
pH = -log[H⁺] = 4.65[tex]10^{-4.65}[/tex] = [H⁺] = 2.24 x 10⁻⁵ MThen we use the expression of Ka for the equilibrium of a weak monoprotic acid:
HA ↔ H⁺ + A⁻
Where:
ka = [tex]\frac{[H^+][A^-]}{[HA]}[/tex]
ka = [tex]\frac{(2.24*10^{-5})(2.24*10^{-5})}{0.25-2.24*10^{-5}}[/tex] = 2x10⁻⁹
Which of the following is the CORRECT FORMULA for an element from GROUP 2
bonded to an element from GROUP 16 (6A)?
A. MgS2
B. Ca2S6
C. BeO
D. Sr2S2
Is N2 + H2 > NH3 balanced?
Answer:
yes
Explanation:
This can be fixed by multiplying the product contacting nitrogen by 2. o The new chemical equation is N2 +H2 →2 NH3 Reactants Products Nitrogen 2 2 Hydrogen 2 6 Since NH3 is multiplied by a coefficient of 2 there are now 2 nitrogens and 6 hydrogens. The 6 hydrogens come from the 2 multiplied by the subscript of 3.
A 0.853-g of 90.0% lithium chlorate mixture decomposes with heat to give 313 ml of oxygen gas collected over water at 20 c and 762 mmHg .what is the percentage of LiCLO3 in the mixture?
Answer:
[tex]\%LiClO_3=90.4\%[/tex]
Explanation:
Hello!
In this case, since the undergoing chemical reaction is:
[tex]LiClO_4\rightarrow LiCl+\frac{3}{2} O_2[/tex]
It is widely known that when a gas given off from a reaction is collected over water, we can compute its pressure by minusing the total pressure 762 mmHg and the vapor pressure of water at the experiment's temperature (20 °C) in this case 17.5 mmHg as shown below:
[tex]p_{O_2}=762mmHg-17.5mmHg=744.5mmHg*\frac{1atm}{760mmHg}=0.980atm[/tex]
Next, by using the ideal gas equation we compute the yielded moles of oxygen considering the collected 313 mL (0.313 L):
[tex]n_{O_2}=\frac{PV}{RT}=\frac{0.980atm*0.313L}{0.082\frac{atm*L}{mol*K}*293.15K}\\\\ n_{O_2}=0.0128molO_2[/tex]
Now, via the 3/2:1 mole ratio between oxygen and lithium chlorate (molar mass = 90.39 g/mol), we compute the original mass of decomposed lithium chlorate as follows:
[tex]m_{LiClO_3}=0.0128molO_2*\frac{1molLiClO_3}{3/2molO_2}*\frac{90.39gLiClO_3}{1molLiClO_3} \\\\m_{LiClO_3}=0.771gLiClO_3[/tex]
Now, the percentage is computed as shown below:
[tex]\%LiClO_3=\frac{0.771g}{0.853g} *100\%\\\\\%LiClO_3=90.4\%[/tex]
Best regards!
She boiled the ingredients as the recipe instructed. What kind of change is this?
A. Physical change
B. Chemical change
Answer:
a
Explanation:
what is the mass number of a carbon isotope with 10 neutrons
Answer:
16 because carbon atom having usual 6 neutron have a mass number of 12 and that with 7 neutron has mass number of 13
9. When 4.46 moles of ethylene, C2H4, burns in oxygen to give carbon dioxide and
water, how many grams of carbon dioxide are formed?
C2H4 + 3 O2 → 2 H2O + 2 CO2
How many grams of carbon dioxide are formed??
Answer:
4.46 moles of Ethylene will produce 392.48 grams of Carbon dioxide.
Explanation:
The reaction is as follows
C2H4 + 3 O2 → 2 H2O + 2 CO2
For complete combustion of Ethylene 1 mole of ethylene gives 2 moles of Carbon dioxide.
using unitary method
1 C2H4 => 2CO2
4.46 of C2H4 => 2*4.46 CO2
= 8.92 CO2
No of moles = given mass(w) /molar mass(M)
Molar mass of CO2 = 44g
8.92 = W / 44
W = 8.92 * 44
= 392.48g
So 4.46 moles of Ethylene will produce 392.48 grams of Carbon dioxide.
4.46 moles of ethylene burns in oxygen to give 393 g of carbon dioxide and water.
What is combustion?Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
Let's consider the reaction for the combustion of ethylene.
C₂H₄ + 3 O₂ → 2 H₂O + 2 CO₂
We can calculate the mass of CO₂ formed by the combustion of 4.46 moles of C₂H₄, considering the following relationships.
The molar ratio of C₂H₄ to CO₂ is 1:2.The molar mass of CO₂ is 44.01 g/mol.4.46 mol C₂H₄ × (2 mol CO₂/1 mol C₂H₄) × (44.01 g CO₂/1 mol CO₂) = 393 g CO₂
4.46 moles of ethylene burns in oxygen to give 393 g of carbon dioxide and water.
Learn more about combustion here: https://brainly.com/question/9425444
True or false? IF we start with an acute angle... the pattern is for the 8 angles are.... ao, oa, ao
Explain three main differences between bacteria and virus.
Which type of data do scientist used to predict tornadoes wind flow in temperature cloud cover and wind flow moisture levels and temperature cloud cover and moisture levels
Answer:
Wind flow and temperature
Explanation:
There is a answer on brainly to this question already
Answer:
I do K12 its wind flow and temp.
Hope this helps,
0Drink0Milk0
Which of the following groups of subjects are categorized under natural science?
a.
Geography, History and Civics
b.
Biology, Chemistry and Physics
c.
Chemistry, Mathematics and Civics
d.
Civics, Mathematics and Physics
Answer:
i guess b is the answer.hope it will help
Which is a characteristic of colloids?
Answer:
A colloid is a mixture composed of particles in a dispersing medium. A colloid is defined by the size of the particles involved. If the particles in a mixture are on the scale of individual molecules, around 1 nanometer, it is defined as a solution. If the particles are larger than 1,000 nanometers, it is a suspension.
Explanation:
i hope this helps you!
The characteristics of colloids are (i) It is a heterogeneous solution (ii) Two phases are present in this solution (iii) It exhibit Tyndall effect (iv) It also exhibit Brownian movement.
What is Colloids ?Colloids is also called Colloidal system or Colloidal solutions are mixture in which one substance microscopically dispersed insoluble particle is suspended throughout another substance.
What are the characteristics of colloids ?The characteristics of colloids are:
Colloids is a heterogeneous mixture. The colloidal solution is turbid. In colloidal solution two phases are present in the solution. One is dispersed phase and another is dispersion phase. Colloidal solution diffuse slowly. It exhibit Tyndall effect. It exhibit Brownian movement.Thus from the above conclusion we can say that The characteristics of colloids are (i) It is a heterogeneous solution (ii) Two phases are present in this solution (iii) It exhibit Tyndall effect (iv) It also exhibit Brownian movement.
Learn more about the Colloids here: https://brainly.com/question/3003333
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When 40g of ammonium nitrate explode 14g of nitrogen and 8g of oxygen form. How many grams of water form?
answer and Explanation:
the same amount would have to stay in grams, so if 14 grams of nitrogen is formed, then 8 grams of oxygen, add those two together and you get 22. and that's 22 of the 40 grams used, so 40 su
Moritz is watching his little brother play in a mud puddle. Moritz notices that when his brother stirs it with a stick, after a few moments the dirt settles back to the bottom of the puddle. His brother is creating a . Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesn’t seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a .
Answer:
1. suspencion
2.colloid
Explanation:
Answer:
Moritz is watching his little brother play in a mud puddle. Moritz notices that when his brother stirs it with a stick, after a few moments the dirt settles back to the bottom of the puddle. His brother is creating a SUSPENSION.
Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesn’t seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a COLLOID.
. A compound contains nitrogen and oxygen in the mole ratio of 1:1. Which of the
following could be the molecular mass of this compound?
14
16
40
30
Answer:
30
Explanation:
Given that;
the compound contains nitrogen and oxygen in the ratio 1:1;
We can say the compound is NO
Now,
Molecular mass of NO;
Molar mass of N = 14g/mol
Molar mass of O = 16g/mol
Molecular mass of NO = 14 + 16 = 30g/mol
Is this a scientific model? Use complete sentences to explain why or why not. (5 points)
help quick
Answer:
yes
Explanation:
What are produced when a base is mixed with water?
hydrogen ions
hydroxide ions
oxygen atoms
oxygen ions
Answer:
The answer is hydrogen ions
How do metals become stable?
Answer:
Atoms of metal elements give away electrons in their reactions to form positive ions. The ions formed have a full outer electron shell, so are very stable.
Explanation:
To become stable, the metal atom wants to get rid of one or more electrons in its outer shell. ... Alternately, an atom that loses electrons becomes a positively charged ion (aka cations). The particles in an ionic compound are held together because there are oppositely charged particles that are attracted to one another.
How many dots go around Rubidium in a Lewis Dot Structure?
Answer:
I believe it's one dot in an electron dot diagram (or rubidium)
Explanation:
I hope this helps
What are three properties of metals?
Help PLZ!!!
Answer:
Luster: Metals are shiny when cut, scratched, or polished.
Malleability: Metals are strong but malleable, which means that they can be easily bent or shaped. ...
Conductivity: Metals are excellent conductors of electricity and heat.
Three properties of metals are:
Good conductors of electricity and heatMalleabilityDuctilityGood conductors of electricity and heat: Metals have a high electrical and thermal conductivity, meaning they allow the flow of electricity and heat through them with ease. This property makes metals valuable in various applications, such as electrical wiring and heat transfer.
Malleability: Metals can be easily shaped and molded into various forms without breaking. They can be hammered, rolled, or pressed into thin sheets without losing their structural integrity. This property allows metals to be used in manufacturing processes and the creation of different products.
Ductility: Metals can be drawn into thin wires without breaking. This property makes them suitable for electrical wiring and cable manufacturing, where flexibility is required.
Learn more about Metals, here:
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Select the options that are properties of electromagnetic waves:
Answer:
They propagate in materialistic media and non-materialistic media ( space ) .
They propagate in the space at constant velocity , which is 3 × 108 m/s .
They consist of vibrating electric and magnetic fields at certain frequency in phase with each other , perpendicular to each other and perpendicular to the direction of the wave propagation ...
Explanation:
welcome!
The properties of electromagnetic waves are the electromagnetic waves are propagated by oscillating electric fields and magnetic field oscillation at right angles to each other, These waves travel with speed 3×108ms−1 in vacuum. Therefore, option A and B are correct.
What are electromagnetic waves ?The term electromagnetic waves or EM waves are defined as the waves that are produced as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are made up of oscillating magnetic and electric fields.
They are created in different processes and are detected in different ways, but they are not basically different. Radio waves, gamma-rays, visible light, and all the other parts of the electromagnetic spectrum are electromagnetic radiation.
Thus, option A and B are correct.
To learn more about an electromagnetic wave, follow the link;
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Your question is incomplete, most probably your question was
Select the options that are properties of electromagnetic waves:
A. Electromagnetic waves are propagated by oscillating electric fields and magnetic field oscillation at right angles to each other.
B. These waves travel with speed 3×108ms−1 in vacuum.
C. They are deflected by electric or magnetic field.
D. They can not show interference or diffraction.
How many moles are present in 2.3 x 1023 molecules of NH3?
Answer:
I don't know if this is helpful. I'm sorry if it is not.
