Answer: The concentration of the acid is 0.01 moles acid/0.040 L = 0.25 moles/L = 0.25 M
Explanation:
18 gm glucose is dissolved in 90 gm of water. The relative lowering of vapour pressure is equal to
Answer:
0.02
Explanation:
Molecular mass of water= 2×1+1×16=18g
=2×1+1×16=18g
For 90g178.2g water nₐ =5
Molecular mass of glucose 6×12+12×1+6×16=180g
For 18g glucose nb =0.1
Now, X B = 0.1 / 0.1 + 5=0.0196 ~0.02
When naming an ionic compound, which comes first, the metal or nonmetal?
Answer:
Explanation:
When naming binary ionic compounds, name the non-metal anion first
When naming an ionic compound, the name of the metal comes first.
An ionic compound is composed of a metal and a nonmetal. Usually, the metal forms the positive ion while the nonmetal forms the negative ion.
When naming an ionic compound, the name of the metal is mentioned first followed by the name of the nonmetal.
For example, when naming an ionic compound that contains sodium and chlorine, the name is sodium chloride.
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A gas occupies a volume of 50.0 mL at 27°C and 630 mmHg. At what
temperature, in *C, would the pressure be 101.3 kPa if the volume remains constant?
Answer:
T2+500k - 273 = 223 *C
Explanation:
If it takes 3.5 hours for the Hogwarts Express, moving at a speed of 120 mi/hr, to it make it from Platform
9 and ¾ to Hogwarts, how far apart are they?
Answer:
3/4 miles
Expanation:Because 9+3/4 is 3/4 miles
Balance the following reaction _Na+_O2=Na2O
What happens to matter when it’s burned?well mayb its distroying the matter
Classify each of the following as elements (E), compounds (C) or Mixtures (M). Write the letter X if it is none of these. ______Diamond (C) ______Sugar (C6H12O6) _______Milk ____Iron (Fe) _____Air ______Sulfuric Acid (H2SO4) _______Gasoline (hydrocarbons) _____Electricity ______Krypton (K) ___Bismuth (Bi) ___Uranium (U) _______Kool-Aid ___Water (H2O) _____Alcohol (CH3OH) ______Pail of Garbage ___Ammonia (NH3) ___Salt (NaCl) ______Energy ______Gold (Au) _______Wood _______Bronze _______Ink ______Pizza ______Dry Ice (CO2) ______Baking Soda(sodium bicarbonate)
Answer:
Diamond - E
Sugar- C
Milk - M
Iron- E
Air- M
Sulfuric Acid- C
Gasoline - M
Electricity- X
Krypton- E
Bismuth - E
Uranium - E
Kool-Aid -M
Water - C
Alcohol - C
Pail of Garbage - M
Ammonia - C
Salt - C
Energy - X
Gold - E
Wood - M
Bronze - M
Ink - M
Pizza - M
Dry Ice - C
Baking Soda - C
Explanation:
An element is the smallest part of a substance that is capable of independent existence. An element cannot be broken down into any other substance. Krypton, Bismuth etc are all elements.
A compound is a combination of two or more elements which are chemically combined together e.g NH3, CO2 etc.
A mixture is any combination of substances that are not chemically combined together. E.g Pizza, milk etc
How does an atom become a positively charged ion?
What can you conclude about the above reaction? * (1 Point)
•It needs air
•It releases heat.
•It releases light
•It absorps heat
6. The human arm, a bat's wing, a whale's flipper, and a horse's
foreleg are examples of
A. Analogous Structures
B. Homologous Structures
C. Vestigial Structures
D. Fossils
I
Would you expect the amount of heat (q, in J) released or absorbed for the dissolution of 4 g of NH4NO3(s) in 50.0 g of water to be greater than, less than, or equal to, the amount of heat released or absorbed for the dissolution of 2 g of NH4NO3(s) in 50.0 g of water
Answer:
Greater
Explanation:
This is because , 4 g of NH4NO3(s) contains more number of moles than 2 g of NH4NO3(s). Since the amount of heat (q, in J) released or absorbed for the dissolution is measured in kJ/mol, the higher the number of moles , the higher the amount of energy released. Since 4 g of NH4NO3(s) contains more number of moles than 2 g of NH4NO3(s), it will thus release or absorb more heat. So, the amount of heat is greater.
Since 4 g of NH4NO3(s) contains more moles than 2 g of NH4NO3(s), it will thus absorb more heat showing that the amount of heat is greater.
Balancing chemical reactionFrom the given information, we are to determine whether the amount of heat released or absorbed is greater or lesser.
From the question, 4 g of NH4NO3(s) contains more moles than 2 g of NH4NO3(s).We must also know that the higher the number of moles of a compound, the higher the amount of energy releasedSince 4 g of NH4NO3(s) contains more moles than 2 g of NH4NO3(s), it will thus absorb more heat showing that the amount of heat is greater.
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Please answer this for 15 points
Which are characteristics of electromagnetic waves? Check all that apply.
travel in straight lines and can bounce off surfaces
travel through space at the speed of light
travel only through matter
travel only through space
can bend around objects
move by particles bumping into each other
move by the interaction between an electric field and a magnetic field
"The characteristics of electro-magnetic travel in straight lines and have the ability to bounce off objects. Traveling at the speed of light can bend around moving objects due to the interplay of an electric and magnetic field."
What is electromagnetic wave?
Electromagnetic waves, or EM waves, are formed when an electric field as well as a magnetic field vibrate together. EM waves, in other terms, are magnetic and electric fields that oscillate.
What is Electromagnetic radiation?
Electromagnetic radiation is made up of electromagnetic field waves that travel over space and convey electromagnetic radiant energy. Radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays are all examples. The electromagnetic spectrum includes all of these wavelengths.
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1. A 25.0-mL sample containing Cu2 gave an instrument signal of 25.2 units (corrected for a blank). When exactly 0.500 mL of 0.0275 M Cu(NO3)2 was added to the solution, the signal increased to 45.1 units. Calculate the molar concentration of Cu2 assuming that the signal was directly proportional to the analyte concentration.
Answer:
6.83x10⁻⁴M is the initial concentration of the Cu²⁺
Explanation:
The concentration is directly proportional to the signal (Beer-Lambert law).
The increase in concentration produce an increase in signal of:
45.1 units - 25.2 units = 19.9 units.
The increase in concentration is of:
0.500mL = 5x10⁻⁴L * (0.0275mol / L) = 1.375x10⁻⁵moles / 0.0255L = 5.39x10⁻⁴M
The conversion factor is 5.39x10⁻⁴M = 19.9 units
That means the initial concentration that produce a signal of 25.2 units is:
25.2 units * (5.39x10⁻⁴M / 19.9 units) =
6.83x10⁻⁴M is the initial concentration of the Cu²⁺Which will have the MOST kinetic energy?
A} A puck traveling at 10 mph C} A puck traveling at 40 mph
B} A player traveling at 10mph D}A player traveling at 40 mph
Answer:
should be B
because the player has more mass than the puck
Explanation:
A careless student forgets to label one of their reagent containers. They know it contains one of the following solutions: 0.1 M NaCl, 0.1 M Ca(NO3)2, 0.1 M KCH3COO The student decides to add some 0.1 M Pb(NO3)2 to a sample of the reagent in question. Upon stirring, a white precipitate formed. Which of the possible solutions was present in the unlabeled container based on this observation
Answer:
He kinda lazy ngl
Explanation:
Rgheeghfgufugf
How much DNA can be extracted from an onion
Natural gas is a mixture of many substances, primarily CH4, C2H6, C3H8, and C4H10. Assuming that the total pressure of the gases is 1.48 atm and that their mole ratio is 94 : 4.0 : 1.5 : 0.50, calculate the partial pressure in atmospheres of each gas:
Answer:
SEE EXPLANATION
Explanation:
We have the mole ratio as; 94 : 4.0 : 1.5 : 0.50
This implies that the total number of natural gas is; 94 + 4.0 + 1.5 + 0.50 = 100 moles
Recall that partial pressure = mole fraction * total pressure
For CH4 = 94/100 * 1.48 atm = 1.39 atm
For C2H6 = 4/100 * 1.48 atm = 0.0592 atm
For C3H8 = 1.5/100 * 1.48 atm = 0.0222 atm
For C4H10 = 0.5/100 * 1.48 atm = 0.0074 atm
You have a 95% EtOH stock solution and want a 70% EtOH solution for sterilization purposes. If you want a final volume of 250 mL, how much 95% EtOH must you add, and how much water must you add
Answer:
65.8mL of water and 184.2mL of the 95% EtOH stock solution must be added.
Explanation:
To solve this question we need to find hoy many times the 95% EtOH must be diluted to obtain a 70% EtOH solution. That is:
95% / 70% = 1.357 times the solution must be diluted.
If we want to make 250mL of the diluted solution, the amount of 95% that must be added is:
250mL / 1.357 times =
184.2mL of the 95% solution must be added
And of water:
250mL - 184.2mL = 65.8mL of water
Solve the equation by first using the Quadratic Formula and then by factoring.
x2 – 14x + 48 = 0
Which element is considered a malleable substance?
a) sulfur b) radon c) hydrogen d) gold
Answer:
Gold
hope this helps :)
Answer: Gold
Explanation: Gold is called a heavy metal because of its high density, which comes from the fact that each of its atoms is individually very heavy. ... In contrast, gold atoms slide past each other relatively easily, which makes the metal soft and malleable.
In baseball home run hitters usually use a heavy bat. According to the formula for momentum why is that important
Answer:
The data shows that a heavier bat produces a faster batted ball speed. This makes intuitive sense since a heavier bat brings more momentum into the collision. ... So, using a heavier bat should result in faster hit balls, which means the hit ball will travel farther.
Explanation:
how many molecules of sugar are in 4.67 miles of sugar?
How many atoms are in 34 g of Cu?
Answer:
Babygirl these are double DD'S
Explanation:
OooOOO I'm hurt oh my neck my neck and my back
2. How might this population suddenly increase? How might this affect the ecosystem? (for tropical savannah.)
Explanation:
it can suddenly increase when more and more people have babies and the infant rate goes up. and how it might affect the ecosystem is the pollution that people give off.
Answer:
Explanation:
Due to less predators in the Savannah/habitat, the population could unexpectedly grow. This will have an impact on the environment because it will give rise to more prey as there will be fewer predators. If too many herbivores are present on one feeding site, competition for food will occur. If there are more plants in an area than normal, it can increase the population of animals that consume the plant. If the population of one animal rises, the population of animals that consume that animal could also rise.
Population growth isn't always good. A population may often grow too big to sustain the climate. Other modifications in limiting variables can cause a population to decline. The population will decrease if a population becomes diseased, and the population of animals that consume the diseased animals will decrease as well. Populations in nature typically balance themselves. Sometimes, they can't always restore a natural balance as man affects populations.
A clear colourless liquad that can be spilt into two gasses into different properties
True or False: The ocean is an example of a carbon reservoir (carbon sink).
True
False
Answer:
A TRUEEEEEEEE
Explanation:
The diagram below shows part of the rock cycle.
Science, Middle school`
Which type of rock does C represent?
A. Igneous Rock
B. Rock formed by cooling
C. Rock formed by heat and pressure
D. Sedimentary Rock
I searched what each rock is called and looks like but I don't which on it is because they kinds all look the same.
Answer:
c
Explanation:
C represents C. Rock formed by heat and pressure.
What is a metamorphic rock?Metamorphic rocks are often squished, smeared out, and folded. regardless of those uncomfortable conditions, metamorphic rocks do not get warm sufficient to melt, or they would end up igneous rocks! common Metamorphic Rocks: common metamorphic rocks include phyllite, schist, gneiss, quartzite, and marble.
Metamorphic rock is any of a class of rocks that result from the alteration of preexisting rocks in reaction to changing environmental situations, such as variations in temperature, strain, and mechanical stress, and the addition or subtraction of chemical components.
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Which compound has only 1 single bond?
Group of answer choices
N2
CO2
Br2
What is the mass of 0.0490 mole of potassium sulfate?
Answer:
8.54g
Explanation:
we know that: n=m/Mm
where:
n represents molesm represent massand Mm represents molar massrearrange for m: m= n x Mm
m= 0.0490mol x 174.259g/mol
m= 8.54g