Answer:
Neither accurate not precise
What hazard symbol does alcohol have? Why?
Answer:
Alcohol has considerable toxic effects on the digestive- and cardiovascular systems. Alcoholic beverages are classified as carcinogenic by the International Agency for Research on Cancer and increase the risk of several cancer types.
Explanation:
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Alcohol has a fire hazard symbol because it is extremely flammable and can create fires. Too be specific, ethanol alcohol is the flammable substance.
Given the chemical formulas of the following compounds, name each compound and state the rules you used to determine each name. KI, Fe2O3, (NH4)3PO4
Answer:
1.) KI
-------> potassium iodide
Potassium (K⁺) is a metal and iodine (I⁻) is a nonmetal. Therefore, when naming, there are no prefixes denoting how many of each element is in the compound. Because potassium is listed first in the compound, it must be the cation. Because iodine is listed second, it must be the anion. Anions in naming have their endings dropped and have the suffix -ide added.
2.) Fe₂O₃
-------> iron(III) oxide
Iron (Fe³⁺) is a metal and oxygen (O²⁻) is a nonmetal. Therefore, when naming, there are no prefixes denoting how many of each element is in the compound. Because iron is listed first, it is the cation and oxygen is the anion. Both of the elements have charges that do not balance each other (denoted by the subscripts). Because iron can have multiple different charges, the charge of iron (+3) should be listed when naming.
3.) (NH₄)₃PO₄
-------> ammonium phosphate
Ammonium (NH₄⁺) and phosphate (PO₄³⁻) are both polyatomic ions. When these ions bond, they also don't have quantity prefixes. Ammonium is the cation and phosphate is the anion. No roman numerals are necessary because the polyatomic ions always have a particular charge.
Which is a property of all bases?
Answer:
can change red litmus to blue litmus
Explanation:
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Is any of the following an acid?
a. Ba(OH)2
b. H3PO4
c. FeCl3
d. NaC2H3O2
e. No acids are listed.
Answer:
b
Explanation:
How many moles of nitrogen gas would be produced if 4.92 moles of copper(II) oxide were reacted with excess ammonia in the following chemical reaction? 2 NH₃(g) + 3 CuO (s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)\
Answer:
4.92/3
Explanation:
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vinegar contains 5g of acetic in 100mL of solution so the (w/v)% concentration is:
The (w/v)% concentration of vinegar contains 5g of acetic in 100mL of solution is approx 0.5 %
What is Concentration ?The concentration of a chemical substance expresses the amount of a substance present in a mixture.
There are many different ways to express concentration.(w/v)% is one of them.
Given ;
Mass of solute(acetic acid) is 5.0 g Volume of solution is 100.0 mL.
We need to convert the grams of acetic acid to moles ;
Formula of acetic acid is CH₃COOH
Thus,
Molar mass of acetic acid = 2(12.01) + 4(1.01) + 2(16)
= 24.02 + 4.04 + 32
= 60.06 grams per mol
Moles of acetic acid = 5.0/60.06
= 0.083 moles
(w/v)% = 0.083 x 60 / 1000 x 100
= 0.498 %
= 0.5 %
Hence, The (w/v)% concentration of vinegar contains 5g of acetic in 100mL of solution is approx 0.5 %
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what kind of investigations allow for the control of variables?
The experimental investigations allow for the control of variables.
What is control of variables?The control of variables is the experimental element that remains constant and unchanged throughout the experiment of the investigation.
The control of variables is held constant during the experiment to test the relation between the dependent and independent variables.
Thus, An experimental investigation allows the control of variables all the time.
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The velocity is ___ when the distance is kept the same and the time is halved
Answer:
Velocity = distance / time
if distance is same and time is 1/2
Velocity = distance / time/2
velocity = 2 (distance /time)
Velocity,= 2 * velocity
Velocity will be doubled
Describe the characteristics that identify a sample of matter as being a substance.
No matter how big or little a material is, its properties remain the same. Size, form, color, and mass are the qualities that distinguish a material from non-substances. All of these qualities, including size, shape, color, and mass, can be seen and measured. Some characteristics are physical, while others are chemical. Physical characteristics include mass, volume, density, and color. Viscosity and solubility are examples of chemical qualities.
In your own words, explain why a study published a cereal company that finds that breakfast is the most important meal of the day is likely to contain bias.
What is the electron configuration of a sodium atom?
1s¹, 2s², 2p6, 356
1s¹, 2s2, 2p6, 3s¹
2s², 2s², 2p6, 3s¹
1s², 2s², 2p6, 3s¹
Answer:
1s²,2s²,2p6,3s¹.Atomic no. of sodium is 11electronic configuration = 2,8,1.that Is 1s²,2s²,2p6,3s1.for electromic configuration - only 2 electron can be there in a single orbital there are 1 s orbital, 3 p orbital ...and so on.Please help thanks in advance
Calculate the equilibrium constant K for the following reaction at 25°C from standard electrode potentials. Fe³(aq) + Cu(s) = Fe²(aq) + Cu²(aq)
The equation is not balanced. Use standard reduction electrode potentials.
The equilibrium constant K for the following reaction at 25°C from standard electrode potentials is Antilog (37.5).
What is chemical equilibrium?Chemical equilibrium is the condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.
Reduction Half-Reaction
[tex]Fe^{3+}[/tex](aq)+[tex]e^-[/tex] →[tex]Fe^{2+}[/tex](aq)
Standard reduction electrode potentials = +0.77
Oxidation Half-Reaction
Cu(s) = [tex]Cu^{+2}[/tex](aq) + 2[tex]e^-[/tex]
Standard reduction electrode potentials = -0.34
E° cell= E°cathode- E°anode
E° cell= +0.77+0.34
E° cell=1.11
E°cell= 0.0592÷n logK
From the redox reaction equations above, n=2
1.11 V= 0.0592÷2 logK
37.5 = logK
K= Antilog (37.5)
Hence, the equilibrium constant K for the following reaction at 25°C from standard electrode potentials is Antilog (37.5).
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If 142.5 g of liquid in the coffee-cup calorimeter rises 8.00 °C, how much heat is released by the neutralization reaction?
Q=mcΔt
Q=142.5 x 4.18 x 8
Q = 4.765 x 10³ J
ements
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2 NH3 + 3 CuO -->3 Cu + N₂ + 3H₂O
In the above equation how many moles of N₂ can be made when 156.1 grams of CuO are
consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report
the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark
your answer incorrect.:
Element Molar Mass
Hydrogen 1
Nitrogen 14
Copper 63.5
Oxygen 16
Answer: The amount of moles that can be produced when 156.1 grams of CuO are consumed is .653 moles.
Explanation: The first thing to do is to convert the 156.1 grams of Copper(II) Oxide (CuO).
In order to convert the 156.1 grams of Copper(II) Oxide to moles we have to first calculate the molar mass of Copper(II) Oxide. This can be done by simply adding the Copper's molar mass, 63.5, to the Oxygen's molar mass, 16.
16 g + 63.5 g = 79.5 g
Once you have obtained the molar mass of the Copper (II) Oxide you can then proceed to convert the 156.1 grams from before into moles.
This is done by multiplying 156.1 grams by 1 mole / 79.5 grams.
[tex]156.1 g *1 moles/79.5 g = 1.96 moles[/tex]
Now that you have calculated the 1.96 moles of Copper(II) Oxide, you need to set up an equation to convert between moles amounts.
This can be done by looking at the coefficients in the chemical equation. So, in this chemical reaction, it tells us for every 3 moles of CuO there is 1 moles of N2.
With this we can write a conversion equation as follows.
[tex]1.96*\frac{1}{3} = .653[/tex]
*Note: in conversion equations the denominator should match the units and or element being multiplied by the other fraction in the numerator. Such as in this instance the 1.96 moles of CuO and 3 moles of CuO are the same.
So, the amount of moles of N2 that can be made when 156.1 grams of CuO are consumed is .653 moles.
Answer:
0.7 mole N₂
Explanation:
To find the amount of N₂ produced, you need to (1) convert grams CuO to moles CuO (via the molar mass) and then (2) convert moles CuO to moles N₂ (via mole-to-mole ratio from reaction coefficients).
The molar mass is the sum of the element molar masses times their quantities. The ratios/conversions should be arranged in a way that allows for the cancellation of units (desired unit in the numerator).
Molar Mass (CuO): 63.5 g/mol + 16 g/mol
Molar Mass (CuO): 79.5 g/mol
2 NH₃ + 3 CuO ----> 3 Cu + 1 N₂ + 3 H₂O
^ ^
156.1 g CuO 1 mole 1 mole N₂
------------------- x ----------------- x ---------------------- = 0.7 mole N₂
79.5 g 3 moles CuO
Tobias notices that a particular kind of flower comes in many slightly different shades of pink. In other places, the same flower may be many shades of purple or even blue. He knows that some flowers' colors depend on where they are planted, while others' are determined by their breed. He hypothesizes that the different colors of these flowers are genetically different. Which of the following experimental setups is best for testing this hypothesis?
A hypothesis is a tentative explanation that is put forward for an observation.
What is a hypothesis?A hypothesis is a tentative explanation that is put forward for an observation. In this case, we have to determine whether the location or the kind of breed affects the color of the flowers.
To test the hypothesis, various shades of colors of the flower may be planted on different locations and the growth of each of the shades monitored to ascertain whether the color depends on the location or solely on the kind of breed.
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A corn plant has been genetically engineered. It produces pollen that can make its own toxins. These toxins protect the corn plant against pests. What is a likely impact on the environment around the corn plant?
Bird and butterfly populations around the area may increase.
The concentration of pesticides in a nearby lake would increase.
Newer strains of pesticide-resistant pests may develop.
The carbon dioxide level would increase in the area.
Answer:
I think the answer is "newer strains of pesticide - resistant pests may develop" as I learnt in Biology, but I'm not sure as I don't know anything about corn plants.
Explanation:
Answer:
newer strains of pesticide
Explanation:
What does the prefix cis-in the name of a stereoisomer indicate about the
functional groups?
How much 5.50M NaOH must be added to 680.0 mL of a buffer that is 0.0215 M acetic acid and 0.0270 M sodium acetate to raise the pH to 5.75?
5.50M NaOH must be added to 680.0 mL of a buffer, The amount of NaOH is mathematically given as
V=2.107mL
What is the volume of 5.50M NaOH?Generally, the equation for Chemical Reaction is mathematically given as
CH3COOH+OH^{-} ⇄ CHCOO^{-} + H2O
Therefore
pka=-log(1.8*10{-5})
pKa=5-0.25527
pKa=4.3447
Hence
[tex]pH=pKa+log\frac{CH3COO}{CH3COOH}\\\\0.75=4.7447+log\frac{0.01564+x}{0.01428-x}[/tex]
x=0.0115898
Volume of NaOH
V=0.0021072L
V=2.107mL
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Throughout the reflection, make sure you have a copy of the Student Guide and your data tables. Use the drop-
down menus to complete the statements.
The independent variable, the one that is intentionally manipulated, is
The dependent variable, the one that you measure the response in, is the pH of the solution
the physical properties
the system for measurement
Answer:
1) mass and type of material
2) type of material
3) temperature
Explanation:
Answer:
For Ed
Explanation:
The first one is: The physical proprieties.
The second one is: The pH of the solution.
I've been seeing the same answers from above around though, so I may be wrong. But either way, I tried.
A phase diagram for elemental carbon is shown below.
Starting at liquid carbon, which action(s) would produce carbon gas?
Answer:
C.) lowering the pressure
Explanation:
As you can see, the liquid and gas phases are stacked right on top of each other. Since temperature is on the x-axis, this means that these phases exist at the same temperature (disregarding any other variables). This means that changing the temperature would not change the liquid phase to the gas phase.
If we want to get the sample into the gas phase, we need to manipulate the sample based on the y-axis. To lower the sample into the gas phase, we need to lower the pressure, which is the variable on the y-axis. This will work because pressure decreases as you go down the y-axis.
7.71 Classify each of the following as exothermic or endothermic:
a. CHÂ(g) + 2O₂(g) —^> CO₂(g) + 2H₂O(g) + 802 kJ
b. Ca(OH)₂(s) + 65.3 kJ →→→ CaO(s) + H₂O(l)
c. 2Al(s) + Fe₂O3(s) — Al₂O3(s) + 2Fe(s) + 850 kJ
A. Heat is released, so the reaction is exothermic.
B. Heat is absorbed, so the reaction is endothermic.
C. Heat is released, so the reaction is exothermic.
What hazard symbol does cement have?
Answer:
The answer is in the picture.
Complete combustion of 8.60 g of a hydrocarbon produced 26.5 g of CO2 and 12.2 g of H2O. What is the empirical formula for the hydrocarbon?
The empirical formula of the hydrocarbon is [tex]C_2H_3[/tex] if combustion of 8.60 g of a hydrocarbon produced 26.5 g of [tex]CO_2[/tex] and 12.2 g of [tex]H_2O[/tex].
What is an empirical formula?A chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule [tex]CH_2O[/tex] is the empirical formula for glucose.
1 mole of carbon dioxide contains a mass of 44 g, out of which 12 g are carbon.
Hence, in this case the mass of carbon in 8.46 g of [tex]CO_2[/tex]:
([tex]\frac{12}{44}[/tex]) × 8.46 = 2.3073 g
1 mole of water contains 18 g, out of which 2 g is hydrogen;
Therefore, 2.6 g of water contains;
([tex]\frac{2}{18}[/tex] × 2.6 = 0.2889 g of hydrogen.
Therefore, with the amount of carbon and hydrogen from the hydrocarbon, we can calculate the empirical formula.
We first calculate the number of moles of each,
Carbon = [tex]\frac{2.3073}{12}[/tex] = 0.1923 moles
Hydrogen = [tex]\frac{0.2889}{1}[/tex]= 0.2889 moles
Then, we calculate the ratio of Carbon to hydrogen by dividing by the smallest number value;
Carbon : Hydrogen
[tex]\frac{0.1923}{0.1923}[/tex] : [tex]\frac{0.2889}{0.1923}[/tex]
1 : 1.5
(1 : 1.5) 2
= 2 : 3
Hence, the empirical formula of the hydrocarbon is [tex]C_2H_3[/tex].
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In what way does ocean water move globally?
A. Along warm-water currents from warmer regions to colder regions
B. Along cold-water currents from the equator to the Poles
C. Along cold-water currents from warmer regions to colder regions
D. Along longshore currents from the equator to the Poles.
Answer:
A. Along warm-water currents from warmer regions to colder regions
\
Explanation:
Guillaume Amontons first took a stab at measuring absolute zero in 1702. What would be the most reasonable way it would have been done then
The most reasonable way to measure absolute zero would have been to extrapolate the ideal gas law.
What is Absolute zero?This is referred to the temperature at which a thermodynamic system has the lowest form of energy.
Guillaume Amontons used gas equation to prove that absence of heat was theoretically possible which would have involved only extrapolating the ideal gas law.
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Which of the following is the best definition of a physical change?
A. A change in a substance where a new substance is formed
B. A change in a substance in which mass is conserved
C. A change in a substance inwhich bonds are broken
D. A change in a substance with no new substances being formed
D. A change in a substance with no new substances being formed
Explanation:There are 2 ways a substance can change, physical changes and chemical changes. In all changes, physical or chemical, mass is always conserved.
Physical vs. Chemical
The main difference between a physical and chemical change is the substance at the end.
Physical changes do not form new substancesChemical changes do form new substancesNew substances are only created by chemical changes. Additionally, only chemical changes break apart bonds. Physical changes maintain the same compounds and elements, so bonds are not broken.
Examples of Physical Changes
Physical changes do not change the actual substance, but they can change the form of the substance.
MeltingBoilingFreezingCrumblingCuttingBreakingAll of these change the state of matter or shape of the substance, but not the chemical makeup.
• How did your experimental absolute zero value compare to the accepted value?
The experimental absolute zero value is less when compared to the accepted value of absolute zero.
What is absolute zero?Absolute zero is defined as the temperature in which the lowest energy possible is attained in a thermodynamic system.
Absolute zero temperature has an accepted values of 0 Kelvin or -273.15 degrees Celsius.
At absolute zero, it is assumed that the volume of an ideal gas becomes zero. However, it has not been possible to cool any gas to absolute zero.
Based on the graph of temperature against volume of gases, the experimental absolute zero extrapolated from the graph where volume of the gases becomes zero is -285 degrees Celsius.
Therefore, the experimental absolute zero value is less when compared to the accepted value.
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Answer:
The experimental absolute zero value is less when compared to the accepted value of absolute zero.What is absolute zero?Absolute zero is defined as the temperature in which the lowest energy possible is attained in a thermodynamic system.Absolute zero temperature has an accepted values of 0 Kelvin or -273.15 degrees Celsius.At absolute zero, it is assumed that the volume of an ideal gas becomes zero. However, it has not been possible to cool any gas to absolute zero.Based on the graph of temperature against volume of gases, the experimental absolute zero extrapolated from the graph where volume of the gases becomes zero is -285 degrees Celsius.Therefore, the experimental absolute zero value is less when compared to the accepted value.
Explanation:
Please help soon thanks
Question 4 (3 points)
The mass of Jupiter is 1.90 x 1027 kg, and the mass of the Sun is 1.99 x 1030 kg. The average
distance between Jupiter and the Sun is 7.78 x 1011 m. What is the gravitational force they exert
on each other?
Answer:
=4.16×10^23Newton
Explanation:
By using formula,
F= GMm/d^2
Identify the products formed in this Brønsted-Lowry reaction.
HCO−3+BrO−↽−−⇀acid+base
Answer:
HCO3- + BrO- → HBrO + CO32-
Explanation:
I think this is the answer hope it helps
