Answer:
Typical metalloids have a metallic appearance, but they are brittle and only fair conductors of electricity. Chemically, they behave mostly as nonmetals. They can form alloys with metals. Most of their other physical properties and chemical properties are intermediate in nature.
Convert the following word equation into a formula equation
fluorine + aluminum bromide → bromine + aluminum fluoride
Explanation:
Fluorine: F-
Aluminium: Al3+
Bromine: Br-
3F2 + 2AlBr3 => 3Br2 + 2AlF3
The balanced equation for the given chemical reaction can be given as
3F[tex]_2[/tex] + 2AlBr[tex]_3[/tex] [tex]\rightarrow[/tex] 3Br[tex]_2[/tex] + 2AlF[tex]_3[/tex]
What is balanced equation?An equation for just a chemical reaction is said to be balanced if both the reactants as well as the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of both the reaction have an equal balance of mass and charge.
The products and reactants of a chemical reaction are listed in an imbalanced chemical equation, but the amounts necessary to meet the conservation of mass are not specified.
The balanced equation for the given chemical reaction can be given as
3F[tex]_2[/tex] + 2AlBr[tex]_3[/tex] [tex]\rightarrow[/tex] 3Br[tex]_2[/tex] + 2AlF[tex]_3[/tex]
Therefore, the balanced equation for the given chemical reaction can be given as
3F[tex]_2[/tex] + 2AlBr[tex]_3[/tex] [tex]\rightarrow[/tex] 3Br[tex]_2[/tex] + 2AlF[tex]_3[/tex]
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What is the standard enthalpy of a reaction for which the equilibrium constant is (a) doubled, (b) halved when the temperature is increased by 15 K at 310 K
Answer:
a) 48KJ
b) -48KJ
Explanation:
Given that;
ln(K2/K1) = ΔH°/R(1/T2 - 1/T1)
K2= equilibrium constant at T2
K1 = equilibrum constant at T1
R = gas constant
T1 = initial temperature
T2 = final temperature
When we double the equilibrium constant K1; K2 = 2K1
T1 = 310 K
T2 = 310 + 15 = 325 K
ln(2K1/K1) =- ΔH°/R(1/T2 - 1/T1)
ln2 = -ΔH°/8.314(1/325 - 1/310)
0.693 = -ΔH°/8.314(3.08 * 10^-3 - 3.2 * 10^-3)
0.693 = -ΔH°/8.314 (-0.00012)
0.693 = 0.00012ΔH°/8.314
0.693 * 8.314 = 0.00012ΔH°
ΔH° = 0.693 * 8.314/0.00012
ΔH° = 48KJ
b) K2 =K1/2
ln(K1/2/K1) =- ΔH°/R(1/T2 - 1/T1)
ln (1/2) = -ΔH°/8.314 (1/325 - 1/310)
-0.693 = -ΔH°/8.314 (-0.00012)
-0.693 = 0.00012ΔH°/8.314
-0.693 * 8.314 = 0.00012ΔH°
ΔH°= -0.693 * 8.314/0.00012
ΔH°= -48KJ
Which of the following orbits the nucleus?
Select one:
a. proton
b. neutron
c. electron
Answer:
Electrons are the orbiting particles
Explanation:
Hope this helps UvU
4Al(s) + 302(g) -> 2Al2O3(s)
How many oxygen atoms are in the product when 4 atoms of solid
aluminum react with 3 molecules of oxygen gas?
Answer:
6 oxygen atoms
Explanation:
when 4 atoms of solid aluminium react with 3 molecules of oxygen gas, 6 oxygen atoms will be in the product
Which type of radiological technology is useful for viewing tumors?
Answer:
CT Scan
Explanation:
Radiology is a branch of medicine that uses imaging technology to diagnose and treat disease. So, an example of a radiology technology that is useful for viewing tumors is Computed Tomography (CT)Scan. Others include Magnetic resonance imaging (MRI), X-rays etc.
When the equations Na + O2 → Na2O is balanced the coefficient for O2 is
a) 1
b) 2
c) 3
d) 4
The coefficient of oxygen gas (O2) in the following balanced equation is: 4Na + O2 → 2Na2O, is 1.
BALANCING EQUATION:
A balanced equation is an equation that contains the same number of atoms of each element on both sides of the equation. Balancing a chemical reaction requires the use of coefficients, which are numbers placed in front of the elements/compounds involved. According to this question, the following reaction is given:Na + O2 → Na2OThe balanced chemical equation using coefficients is as follows:4Na + O2 → 2Na2OThis balanced equation shows that 1 mole of oxygen is involved, hence, the coefficient is 1.Learn more about coefficient of balanced equation at: https://brainly.com/question/21049751?referrer=searchResults
PLEASE ANSWER 10 POINTS PLUS BRAINLIEST IF RIGHT
How did scientists calculate the most exact value for the mole?
1. through x-ray diffraction of silicon atoms
2. through the kinetic molecular theory by calculating the number of particles in a sample of gas
3. through counting the atoms in a sample of carbon-12 under a microscope
4. through the charge of an electron and Faraday’s constant
Answer:
it's answer is through the charge of an electron and Faraday's constant
What actions can you take to reduce your impact on society?
Answer:
Cut Down On Waste. One of the simplest ways you can reduce your impact on the planet is by cutting down on waste. ...
Support Sustainable Companies. ...
Limit Your Meat Intake. ...
Reduce Energy and Water Use. ...
Offset Your Carbon Emissions. ...
Re-purpose, Recycle, and Borrow.
Explanation:
Plz mark brainliest thanks
Which of these goals of President Truman's "Fair Deal" were met?
A. Providing federal aid to education
B. Getting rid of the Taft-Hartley Act
C. Starting a national health insurance program
D. Expanding Social Security
The goals of President Truman's "Fair Deal" were met is to be considered as the option d. Expanding Social Security.
Reason for Truman's "Fair Deal":Congress has approved Truman's extension of Social Security benefits, due to this it eliminates the national health care idea, that avoid any passing of new civil rights legislation, and failed to tackle concerns with respect to the fair labor practices.
Hence, the option d is correct.
And, the rest of the options are incorrect.
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"Fair Deal" was a proposal given by Harry S. Truman, the president of America. The primary goal of the deal was to expand social security. Thus, option D is correct.
What was the "Fair Deal?""Fair Deal" was proposed by Truman to halt the inflation rate by controlling the economy, increase in the minimum wage structure, reform in agriculture, progressive tax layout, expansion of social security, etc.
Truman's fair deal was not a success and was a failure because of the rise in political conservatism. Social security was related to the national health care idea. Only three of his ideas in the deal were met at the end of the congress session others were a failure.
Therefore, the expansion of social security was met in Truman's "Fair Deal."
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Look at the food web below.
grass
wheat
grasshopper
mouse
toad
snake
hawk
Which organisms would be at the bottom of the energy pyramid for this
ecosystem?
Explanation:
At the bottom of the energy pyramid, there would be the producers.
In here the producers are grass and wheat. (D)
What is the momentum of a bird with a mass of 2 kg flying at 9 m/s? *
Answer:
18 kg.m/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question we have
momentum = 2 × 9
We have the final answer as
18 kg.m/sHope this helps you
Helpz me pleaz! I don't quite get it
Answer:
Al2O3
Explanation:
Al2O3 has an ionic bond because the bonds between them are very strong
The reaction AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq) is a_________
reaction. please help
Answer:
it's a precipitation reaction.
Explanation:
the solid produced is insoluble with water–making it a precipitate.
Can someone please walk me through this?-- 25 pts!
Calculate the change of enthalpy for the reaction CH4 (g) + NH3 (g) --> HCN (g) +3H2 (g) from the following reactions:
Reaction 1: N2 (g) + 3H2 (g) --> 2NH3 (g); Change in enthalpy(∆ H): -91.8 kJ/mol
Reaction 2: C (s, graphite) + 2H2 (g) --> CH4 (g); Change in enthalpy(∆ H): -74.9 kJ/mol
Reaction 3: H2 (g) + 2C (s, graphite) + N2 (g) --> 2HCN (g); Change in enthalpy(∆ H): +270.3 kJ/mol
I have to include the following:
>The numerical answer with correct units.
>State which reactions, if any, you had to "Flip". ("Flipping" refers to modifying one of the reactions above to make a chemical be present on the other side-- like flipping an N2 that is on the reaction side. If it needs to be on the product side, you flip the reaction. Hope that makes sense.)
>State which reactions you had to multiply, if any, to get the correct amount of the compound. Also, include how much you multiplied the reaction by.
NH3(g) + CH4(g) ⇒ HCN + 3H2 ∆ H:255.95
Further explanationGiven
Reaction and the enthalpy
Required
The change of enthalpy
Solution
Reaction 1
N2 (g) + 3H2 (g) --> 2NH3 ∆ H: -91.8 kJ/mol⇒reverse
2NH3 ⇒ N2 (g) + 3H2 (g) ∆ H: +91.8 kJ/mol
Reaction 2
C (s, graphite) + 2H2 (g)⇒ CH4 (g) ∆H: -74.9 kJ/mol ⇒reverse
CH4 (g) ⇒ C (s, graphite) + 2H2 (g) ∆H: +74.9 kJ/mol ⇒ x2
2CH4 (g) ⇒ 2C (s, graphite) + 4H2 (g) ∆H: +149.8 kJ/mo
Reaction 3
H2 (g) + 2C (s, graphite) + N2 (g) ⇒ 2HCN (g);∆ H: +270.3 kJ/mol
Add up all the reactions and remove the same compound from different sides :
2NH3 ⇒ N2 (g) + 3H2 (g) ∆ H: +91.8 kJ/mol
2CH4 (g) ⇒ 2C (s, graphite) + 4H2 (g) ∆H: +149.8 kJ/mol
H2 (g) + 2C (s, graphite) + N2 (g) ⇒ 2HCN (g) ∆ H: +270.3 kJ/mol
-----------------------------------------------------------------------------------------
2NH3(g) + 2CH4(g) ⇒ 2HCN + 6H2 ∆ H: 511.9 ⇒ :2
NH3(g) + CH4(g) ⇒ HCN + 3H2 ∆ H:255.95
For the chemical reaction of ammonia combustion, write the expressions for velocity chemical reactions as a change in the concentration of all participants: 4 NH 3 (S ) + 5O 2 ( g ) 4 NO ( g ) + 6 H 2 O ( g )
Answer:
See explanation
Explanation:
We define the rate of reaction as the rate of disappearance of reactants or the rate of appearance of products. The negative sign written before the rate of change of concentration of reactants shows that their concentration decreases with time.
The rate of reaction in terms of the concentration of each reactant or product is shown below;
Rate = -1/4d[NH3]/dt
Rate = -1/5d[O2]/dt
Rate = 1/4d[NO]/dt
Rate = 1/6[H2O]/dt
Many organisms in an ecosystem compete with each other for resources. What might different species of trees in a forest ecosystem compete for?
Answer:
Water
Explanation:
Answer:
Water
Explanation:
Becasue the forest needs water to survie they may all compete for it.
How are mass and density different
Answer:
An object's density is the ratio of mass to volume of an object. The mass is how much it resists acceleration when a force is applied to it and generally means how much of an object or substance there is.
Answer:
brainleist
pls
Explanation:
An object's density is the ratio of mass to volume of an object. The mass is how much it resists acceleration when a force is applied to it and generally means how much of an object or substance there is.
Which of the alkaline-earth metals has the smallest ionization energy?
Answer:
Cesium
Explanation:
For the reaction C+2H 2 —->CH 4 calculate the percent yield if 98 g of methane is produced when 100. g of carbon reacts with an excess of hydrogen?
The percent yield : 73.5%
Further explanationGiven
Reaction
C+2H₂⇒CH₄
Required
The percent yield
Solution
mol of Carbon(as a limiting reactant) :
[tex]\tt \dfrac{100}{12}=8.3[/tex]
mol CH₄ based on C, and from equation mol ratio C : CH₄, so mol CH₄ = 8.3
Mass of Methane(theoretical yield) :
[tex]\tt mass=mol\times MW\\\\mass=8.3\times 16=133.3~g[/tex]
[tex]\tt \%~yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{98}{133.3}\times 100\%=73.5\%[/tex]
indefinite shape, but definite volume
Answer:
A solid has definite volume and shape, a liquid has a definite volume but no definite shape, and a gas has neither a definite volume nor shape. The change from solid to liquid usually does not significantly change the volume of a substance.
Explanation:
Help please!!
in the lab you react 23 g of potassium iodide with an excess of lead (II) nitrate to form 18 g of lead (II) iodide precipitate. What is the percent yield of your experiment?
A) 28
B) 56
C) 84
D) 98
This value is approximate.
=============================================
Work Shown:
From the periodic table, we are working with these elements
K = PotassiumI = IodinePb = Leadand they form these relevant compounds
Potassium iodide = KILead (ii) iodide = [tex]PbI_2[/tex]Note: the lead (ii) nitrate chemical formula and it's chemical data (eg: atomic mass) doesn't matter so we won't worry about it.
--------------------
Using the periodic table, specifically the atomic mass of each element mentioned, we can find that:
Molar Mass of KI = 166.00277 grams per molMolar Mass of PbI2 = 461.00894 grams per molThey are approximate values based on the average atomic mass.
Those values are handy in calculating the theoretical yield
That theoretical yield is roughly...
[tex]\left(23 \text{ g } KI\right)*\left(\frac{\text{1 mol } KI}{\text{166.00277 g } KI}\right)*\left(\frac{\text{1 mol } PbI_2}{\text{1 mol} KI}\right)*\left(\frac{\text{461.00894 g } PbI_2}{\text{1 mol } PbI_2}\right)\approx 63.8736668 \text{ g } PbI_2[/tex]
So 23 grams of potassium iodide, and the excess amount of lead (ii) nitrate (the amount of this isn't important as long as it exceeds the potassium iodide amount) react together to produce a theoretical yield of about 63.8736668 grams of lead (ii) iodide precipitate.
-----------------------
Despite us calculating the theoretical yield to be 63.8736668 grams, we actually only got 18 grams. We call this the "actual yield".
To get the percent yield, we divide the actual yield over the theoretical yield and multiply by 100%
So,
[tex]\text{percent yield} = \frac{\text{actual yield}}{\text{theoretical yield}}*100\%\\\\\text{percent yield} \approx \frac{18 \text{ g of } PbI_2}{63.8736668 \text{ g of } PbI_2}*100\%\\\\\text{percent yield} \approx \frac{18}{63.8736668}*100\%\\\\\text{percent yield} \approx 0.2818*100\%\\\\\text{percent yield} \approx 28.18\%\\\\\text{percent yield} \approx 28\%\\\\[/tex]
In short, we expected to get a theoretical amount of roughly 63.87 grams of lead (ii) iodide, but instead we got roughly 28% percent of that theoretical amount and got 18 grams of it instead.
The images show two different fronts. Item A: A cold front and warm front meet with high level, grey clouds. Item B: Warm air is above cold and very cold air, lower clouds with rain falling. Which fronts are shown? Item A shows a cold front, and item B shows a warm front. Item A shows an occluded front, and item B shows a cold front. Item A shows a warm front, and item B shows a stationary front. Item A shows a stationary front, and item B shows an occluded front.
Answer:
d
Explanation:
because it cause the weather it moves
Answer:
D is the answer ( not 100% sure tho )
what action is a result of gravity in relation to moving tectonics plates
Answer:
When the denser tectonic plate dives beneath another plate it is due to the high energy by the Earth’s gravity that pushes into the mantle. Earth’s tides, which are caused by a gravitational tug of the Moon and the Sun, also put extra strain on geological faults. how to prepare for an earthquake
Explanation:
name two life processes that viruses cannot carry out
Two life processes that viruses cannot carry out are Respiration and Sensitivity.
4. What do nutrigenomics and pharmacogenomics have in common?
Answer:
Individual genetic variation
Explanation:
is the common factor on which both pharmacogenomics and nutrigenomics are based.
In trying to control fall armyworms in crops, an Agriculture extension officer applied cypermethrin which was prepared by dissolving 200g of the cypermethrin , C22H19Cl2NO3 in 1000g of water H2O . Calculate the mole fraction of cypermethrin in the solution.
Answer:
Mole fraction for C₂₂H₁₉Cl₂NO₃ = 0.0086
Explanation:
Mole fraction remains a sort of concentration. It indicates:
moles of solute / (moles of solute + moles of solvent)
Moles of solute / Total moles.
Solute: Cypermethrin → C₂₂H₁₉Cl₂NO₃
Solvent: Water (PM = 18g/mol)
We calculate moles from solvent: 1000g /18 g/mol = 55.5 moles
We calculate PM for C₂₂H₁₉Cl₂NO₃
12g/mol . 22 + 1g/mol . 19 + 35.45 g/mol . 2+ 14g/mol + 16g/mol . 3 = 416 g/m
Moles of solute: 200 g / 416g/mol = 0.481 moles
Total moles: 0.481 + 55.5 = 55.98 moles
Mole fraction for C₂₂H₁₉Cl₂NO₃ = 0.481 moles / 55.98 moles = 0.0086
what happens after we die? spirtually and physically
To separate a mixture of large gravel and sand, the most effective method would be
Answer:
Sieve
Explanation:
A sieve or screen would be the best tool to use when separating a mixture of sand and gravel.
Answer:
the third option on edge:)
Explanation:
A small block of solid aluminum is removed from a freezer and heated from -5C to 5C in 5 minutes using a hot plate. The hot plate provides a constant rate of heat output during this time.
What is the sequence in the formation of the Earth and the Universe?
The Earth and Universe formed around the same time
The Earth formed billions of years after the Universe formed
The Universe formed millions of years before the Earth formed
The Earth Formed before the Universe formed
Answer:
The Earth formed billions of years after the Universe formed
Explanation:
The "universe" is said to have been formed billions of year ago through an explosion. This was called the "Big Bang Theory." This lead to the expansion of the universe owing to its high temperature and density. After which, the universe cooled down. Galaxies and stars were then formed. Some of the stars died due to explosion, which then led to the creation of planets. Such formation of the planets happened around 4.5 billion years ago. This is 9.3 billions of years later than the universe was formed (13.8 billions of years ago). So, this explains the answer.