Answer: An experimental group is a test sample or the group that receives an experimental procedure.
Explanation: This group is exposed to changes in the independent variable being tested. The values of the independent variable and the impact on the dependent variable are recorded. An experiment may include multiple experimental groups at one time.
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A sample of 0.500 moles of nitrogen occupies 1.000 L. Under the same conditions, what number of moles occupies 1.200 L
Answer:
I think
0.6 moles of nitrogen
The pretend element, knoxium, Kx, has the following composition:
164Kx, 164.08 amu (60.44%)
165Kx, 165.11 amu (13.55%)
169Kx, 168.92 amu (??????%)
What is the average atomic mass of the "knoxium"?
164.08amu
165.48amu
166.04 amu
Answer:
165.48 amu
Explanation:
First, you need to find the last percentage.
100% = 60.44% + 13.55% + x
100% = 73.99% + x
x = 26.01%
Now, multiply each mass by the respective percentage.
164.08 × 0.6044 = 99.17
165.11 × 0.1355 = 22.37
168.92 × 0.2601 = 43.94
Lastly, add the products together to find the average atomic mass.
99.17 + 22.37 + 43.94 = 165.48
The average atomic mass of "knoxium" is 165.48 amu
Identify the shape of the molecules that could result from each of the hybrid orbitals given below. Check all of the boxes that apply. sp-orbitals bent, linear, trigonal planar.
Answer:
sp2 = Bent, trigonal plannar
ap3=Bent, trigonal bipyramidal
Explanation:
right on edge 2021
Answer:
sp2 bent
trigonal planar
sp3 bent
tetrahedral
Explanation:
vitamin A in chemistry
Answer:
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Vitamin A is a fat-soluble vitamin and an essential nutrient for humans. It is a group of organic compounds that includes retinol, retinal (also known as retinaldehyde), retinoic acid, and several provitamin A carotenoids (most notably beta-carotene (β-carotene).
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How many grams does 1.0 liter of motor oil weigh if the density of motor oil is 0.80 g/mL?
Answer:
800 grams
Explanation:
Density = mass/volume => mass = Density x Volume
Density = 0.80 g/ml
Volume = 1.0 Liter = 1000 ml
mass of 1.0 liter = 0.80 g/ml X 1000 ml = 800 grams
how do water molecules disslove in salt
Because the positive part of water molecules attracts negative chloride ions and the negative part of water molecules attracts positive sodium ions, water may dissolve salt. The solubility of a material is the quantity of that substance that can dissolve in a liquid (at a given temperature).
Plant A gets no fertilizer, plnt B-5mg/day, and plnt C-10mg/day. Which is the control group?
Answer:
Plant A
Explanation:
This is because Plant A is what you will compare to the other plants. Because it has no fertilizer is is the independent variable.
Why is it difficult to make vaccines for viruses? (1 point)
O All known vaccine molecules must be tested to find the right one.
O All known viruses must be tested against new vaccines
O Viruses mutate to attack the vaccine molecules so new ones must be continually produced
O Vaccines are very small so it is difficult to determine if the molecule fits
Answer:
All known vaccine molecules must be tested to find the right one.
Explanation:
I took the test
A perfume bottle is dropped in the corner of a room. The odor of the perfume can be detected on the other side of the room. Which statement best describes this observation?
Particles are moving from regions of high concentration to low concentration.
Particles are moving from regions of low concentration to high concentration.
Particles are moving through a small opening into a smaller volume.
Particles are moving through a small opening into a larger volume.
Answer: Particles are moving from regions of high concentration to low concentration.
Explanation:
Diffusion is driven by differences in concentration. When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. The particles of smelly gas are free to move quickly in all directions. They eventually spread through the whole room from an area of high concentration to an area of low concentration. This continues until the concentration of the particles of smelly gas is the same throughout the room. Remember that the particles still move, even when the smell is evenly spread.
Answer:
Answer: Particles are moving from regions of high concentration to low concentration.
Explanation:
right on edge 2021
How are infrared visible light and ultraviolet Ray's related.
Answer:
Infrared radiation has longer waves than red light, and thus oscillates at a lower frequency and carries less energy. Ultraviolet radiation has shorter waves than blue or violet light, and thus oscillates more rapidly and carries more energy per photon than visible light does.
Explanation:
An ideal solution is prepared by mixing 15.6 g of toluene, C6H5CH3, and 136.2 g of butan-
1-ol, C4H9OH at 25 °C. The vapour pressure of pure butan-1-ol is 885 Pa at this
temperature. Calculate the partial pressure of butan-1-ol in the vapour above the mixture.
This problem is providing the masses of both toluene and butan-1-ol and the vapor pressure of the latter when pure. Thus, it asks for the vapor pressure of this alcohol in the mixture, therefore the answer turns out 812 Pa.
Raoult's lawIn chemistry, when two pure liquids are mixed, their properties as a mixture differ from those when pure, for that reason we use the Raoult's law in order to quantify these properties as pure substances, or when mixed with other substances.
In such a way, one can write this law for butan-1-ol as follows:
[tex]P_{but}=P_{but}^{pure}*x_{but}[/tex]
Where we know its vapor pressure as 885 Pa and we want to calculate its partial pressure but first its molar fraction with the given masses converted to moles as follows:
[tex]x_{but}=\frac{n_{but}}{n_{but}+n_{tol}} \\\\n_{but}=136.2g*\frac{1mol}{74.121g}=1.838mol\\ \\n_{tol}=15.6g*\frac{1mol}{94.14g} =0.166mol\\\\x_{but}=\frac{1.838mol}{1.838mol+0.166mol}=0.927[/tex]
Finally, we solve for its partial pressure:
[tex]P_{but}=885Pa*0.917\\\\P_{but}=812Pa[/tex]
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Methane and Sulfur react to produce carbon disulfide and hydrogen sulfide. what is the balanced equation?
Answer:
CH₄ +2S₂ → CS₂ +2H₂S
Explanation:
How many liters of CO2 and H2O - measured together at 710 K - can be produced from the combustion at 710 K of 5.75 L of CH4 and as much O2 as needed?
In the complete combustion of 5.75 L of CH₄ at 710 K, 5.75 L of CO₂ and 11.5 L of H₂O.
What is combustion?Combustion 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.
Step 1: Write the balanced combustion reaction.CH₄(g) + 2 O₂(g) ⇒ CO₂(g) + 2 H₂O(g)
Step 2: Calculate the volume of CO₂ produced.According to the balanced equation, the volume ratio of CH₄ to CO₂ is 1:1.
5.75 L CH₄ × 1 L CO₂/1 L CH₄ = 5.75 L CO₂
Step 3: Calculate the volume of H₂O produced.According to the balanced equation, the volume ratio of CH₄ to H₂O is 1:2.
5.75 L CH₄ × 2 L H₂O/1 L CH₄ = 11.5 L H₂O
In the complete combustion of 5.75 L of CH₄ at 710 K, 5.75 L of CO₂ and 11.5 L of H₂O.
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Electron Identify the type of charge of the following particles in an
atom
Electron
Neutron
Proton
Answer:
Electron charge: -1
Neutron charge: 0
Proton charge: +1
I’m just gonna keep doing these keep answers ga me you will get brainliest
Answer:
Thx
Explanation:
A 6M sulfuric acid solution (H2SO4 in water) is flowing into a tank at the rate of 100 liters/min (also can be written 100 L/min). The density of the solution is 1.34 g/cm3 . Determine the value of the items requested below (show your work). For parts (b) - (d), first write out the equation using symbols for the appropriate variables, then algebraically solve for the unknown variables, and finally substitute in the numerical values and calculate the values for the unknown variables
Based on the flow rate data provided for the 6 M sulfuric acid solution;
molar flow rate = 600 mol/minMass flow rate = 58.8 kg/mintotal mass flow rate = 134 kg/min What is the molar mass of sulfuric acid, H2SO4?The molar mass of sulfuric acid is obtained from the molar atomic masses of it component elements.
Molar mass of H2SO4 = (2 × 1) + (32 × 1) + (16 × 4)
Molar mass of H2SO4 = (2 = 98 g/mol
Based on the flow rate data provided:
Moles of 6 M sulfuric acid in 100 L = molarity × volume
Moles of 6 M sulfuric acid in 100 L = 6 M × 100 L = 600 moles
molar flow rate = 600 mol/min
Mass of 600 moles sulfuric acid = moles × molar mass
Mass of 600 moles sulfuric acid = 600 × 98 = 58.8 kg
Mass flow rate = 58.8 kg/min
Mass of sulfuric acid in 100 L solution = volume × density
density of sulfuric acid = 1.34 g/cm^3 = 1.34 kg/L
Mass of sulfuric acid in 100 L solution = 1.34 kg/L × 100 L = 134 kg
Therefore, total mass flow rate = 134 kg/min
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Adam likes to make sure he eats healthy diet including fruits and vegetables. His body system works to make sure this food is broken down into small enough pieces and is then delivered to the areas in his body that need it the most . Which body system will work together to make sure nutrients get to every cell in his body
Answer:
Explanation:
Your circulatory system carries oxygen, water, and nutrients to cells throughout your body. Wastes from the cells are eliminated by your respiratory system, your excretory system, and your skin. Your nervous system controls all these activities with electrical impulses.
Assuming a 4.00 litre of a sample gas at 1.00 atm compressed to 0.800 litre at constant temperature. Calculate the final presure of the gas.
At constant temperature, the final pressure of the compressed gas is 5.0atm.
Given the data in the question;
Initial volume of the gas; [tex]V_1 = 4L[/tex]Initial Pressure; [tex]P_1 = 1.0atm[/tex]Final volume; [tex]V_2 = 0.800L[/tex]Final pressure; [tex]P_2 = \ ?[/tex]
Boyle's lawBoyle's law states that the volume V of a given quantity of gas is inversely proportional to its pressure P at constant temperature.
It is expressed as;
[tex]P_1V_1 = P_2V_2[/tex]
Where [tex]P_1[/tex] is Initial Pressure, [tex]V_1[/tex] Initial volume, [tex]P_2[/tex] is Final Pressure and [tex]V_2[/tex] is Final volume.
To determine the final pressure of the gas, we substitute our given values into the expression above.
[tex]P_1V_1 = P_2V_2\\\\P_2 = \frac{P_1V_1}{V_2} \\\\P_2 = \frac{1.0atm \ *\ 4L}{0.800L}\\ \\P_2 = \frac{1.0atm \ *\ 4}{0.800}\\\\P_2 = \frac{4.0atm}{0.800}\\\\P_2 = 5.0atm[/tex]
Therefore, at constant temperature, the final pressure of the compressed gas is 5.0atm
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1. How many moles are in 3.01 x 1023 atoms of calcium?
Answer:
.5 moles of calcium
Explanation:
We want to find the number of moles in 3.01 x 10^23 atoms of calcium
To convert atoms to moles, we simply divide the given number of atoms by Avogadro's number , 6.022 x 10^23
Given number of atoms : 3.01 x 10^23
Number of moles : 3.01 x 10^23 / 6.022 x 10^23 = .5 moles of calcium ( rounded )
Why do water pipes sometimes burst in winter? (Has to do with volume)
Answer:
Water pipes sometimes burst during the winter because the cold causes the water to expand when frozen so the pipes cant exactly stretch causing stress on the pipe until it inevitably bursts
Which statement explains why calcium is classified as
a Group 2 element?
A) A sulfur atom has 2 valence electrons.
B) A sulfur atom has 20 neutrons.
C) Calcium is a grey solid at STP.
D) Calcium reacts with most non-metals.
Answer:
A
Explanation:
This group includes beryllium, magnesium, calcium, strontium, barium, and radium. All group 2 elements have two valence electrons
Which term identifies the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius?
Specific heat
Boiling point
Melting point
Specific heat capacity
The term that identifies the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius is Specific heat capacity.
What is specific heat capacity?
Specific heat capacity is the quantity of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius. The unit of specific heat capacity is joule per gram per degree Celsius (J/g⁰C).
Difference between heat capacity and specific heat capacitySpecific heat capacity is heat required to raise the temperature of a unit mass of a substance while heat capacity is the quantity of heat required to raise the temperature an entire mass of a substance.
Heat capacity is measure in Joules (J) while specific heat capacity is measured in joule per gram per degree Celsius (J/g⁰C).
Thus, the term that identifies the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius is Specific heat capacity.
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The term that identifies the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius is : ( A ) Specific heat
Specific heatSpecific heat also known specific heat is the amount of heat that is added to 1 unit ( gram ) of a substance in order to raise its temperature by one ( 1 ) degree Celsius of temperature.
Hence we can conclude that The term that identifies the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius is Specific heat
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Which unequal condition causes a sea breeze to develop
A:warmer air over land than water
B:warmer air over water than land
Please help me
Answer:
Drier air over land than water
OR
A:warmer air over land than water
NEED HELP ASAP!!!!
Type the correct answer in the box. Spell all words correctly.
The boxer crab carries sea anemone in its claws and uses its stinging tentacles against predators. In turn, the anemone consumes the crab's
leftovers. What form of ecological relationship is this?
The relationship between the boxer crab and anemone is a form of
blank
Answer:
The relationship between the boxer crab and the anemone is a form of symbiosis, called mutualism.
Explanation:
The boxer crab —Lybia tesselata— receives its name because it carries anemones in its anterior claws, in the form of boxing gloves, constituting a symbiotic association of a mutual type.
Mutualism is an interspecific relationship where two individuals of different species benefit from each other.
The anemone —usually of the genus Triactis or Bunodeopsis— has tentacles capable of secreting a stinging substance that contributes to the defense of the crab against its natural predators. On the other hand, the crab helps the anemone to transport and feeds on the food remains left by the crab.
What ions are produced from acids and from bases?
after vacuum filtration 9.84 grams of potassium alum product was obtained. This means that the actual yield of potassium alum is 6.98 grams. Calculate the percent yield of this process using your theoretical yield from #7
Answer:
70.9% or 71% yield
Explanation:
actual yield/theoretical yield * 100% = % yield
6.98/9.84 * 100 = 70.9
Enter an equation for the formation of Al2O3(s) from its
elements in their standard states.
Express your answer as a chemical equation including
phases.
The compound, solid Al2O3, is formed from solid aluminum and oxygen gas under certain conditions.
Formation of Al2O3Solid aluminium oxide, Al2O3, is formed from its components elements as follows:
2Al (s) + 3O2 (g) ----------> 2Al2O3 (s)
The state of the aluminum element is solid, that of oxygen is gas, and that of the product, Al2O3, is solid.
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Metals can be involved in ____
Answer: ionic bonds, covalent bonds
Explanation:
Got it right on my test.
Metals can forms ionic bond with non-metals by losing electrons from metals to the non-metals. They can also form metal metal bonds when they make metallic complexes and dimers. Thus option 4 is correct.
What is ionic bonding ?Ionic bond is the strongest type of bond formed between metals and nonmetal. Metals are electron rich and thus they are electropositive. They can donate electrons to non-metals.
Electronegative non metal atoms gain one or more electrons from the metals and thus forms the ionic compounds. Hence, ionic compounds are formed between atoms of high electronegativity difference.
Non metals like oxygen, nitrogen , halogens etc are highly electronegative and withdraw electrons from metals. Ionic compounds can have polarity if there occurs a charge separation between atoms.
Metals can also form metal-metal bonds with other metals in the case of coordination compounds and organometallic compounds. Hence, option 4 is correct.
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Your question is incomplete. But your complete question probably was:
Metals can be involved in _______ ?
1, Covalent bonding
2.Ionic bonding
3. Metal-metal bond
4. Two of the above.
who often does galeras erupt
Answer:
Galeras has erupted more than 20 times since the 1500s. Volcanic activity has been frequent in the last five years, including an eruption in January 1993 that killed nine people on a scientific expedition to the volcano summit. Chuck Wood of VolcanoWorld was on Galeras at that time but was not injured
Explanation:
Galeras has erupted more than 20 times since 1500s. Volcano activity has been frequent in the last 5 years,including an eruption in January 1993 that killed nine people on a scientific expedition to the volcano summit.
what would lead to a higher final temperature of water, a metal with a low heat capacity of a high heat capacity
A hot metal with a low heat capacity will raise the final temperature of water more than a hot metal with high heat capacity.
Heat capacityIt is the amount of heat required to change the temperature of a substance by just a unit.
Substances that heat up quickly are said to have low heat capacities while those that take time to heat up are said to have high heat capacities.
Substances with low heat capacity also release their thermal energy quicker than those with high heat capacity.
Thus, a hot metal with low heat capacity will readily transfer its thermal energy to water than a hot metal with high heat capacity.
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