Answer:
An impure substance
Explanation:
Substance means: hard surface example: salt,corals,coal.
Balance the equation:
Ca(OH)2 +2 HBr → CaBr2 + 2 H2O
How many liters are in 4 moles of a gas at stp?
Answer:
Molar volume at STP can be used to convert from moles to gas volume and from gas volume to moles. The equality of 1 mole = 22.4 L is the basis for the conversion factor.
Explanation:
40 PIONTS!! PLZZZZ HELP
Determine whether each of the following will undergo dissociation,
dissolving or ionization. Then write the solvation equation for each
substance:
a) Lithium oxide
b) Magnesium nitride
c) Hydrobromic acid
Lithium oxide is able to undergo both the processes of dissolution and dissociation.
Dissociation refers to the break down a chemical substance into its constituents. Ionization refers to the loss of electrons from a chemical specie while dissolving refers to the ability of a solid to form a solution.
Let us now look at each of the following species;
Lithium oxide undergoes dissolution and dissociation. Magnesium nitride undergoes dissolution and dissociation.Hydrobromic acid undergoes dissolution and dissociation.Learn more about ionization: https://brainly.com/question/1602374
Find the actual yield when the theatrical yield is 1.09g and percent yield is 90%.
How do you prepare 500ml of 1.77M H2SO4 solution from an 18.0M H2SO4 Stock solution
Answer:
Take 49.2-ml of 18.0 M H2SO4 stock solution and pour it into a 500-ml volumetric flask. Fill to the 500-ml line with distilled water to make 1.77M H2SO4 solution.
Explanation:
use the formula M1V1=M2V2
volume must be in liters(L)
[tex](1.77)(500 \times {10}^{ - 3} ) = (18)v2 \\ 0.885 = 18v2 \\ v2 = \frac{0.885}{18} \\ v2 = 0.04916[/tex]
0.04916L × 1000 = 49.16 ml = 49.2 ml
A group of scientists are studying observable matter in a cluster of galaxies. They conclude that the cluster has only a small percentage of the mass required to keep it from
flying apart. Why does the duster remain intact?
Answer:
it is because of Dark Matter
Dark Matter, component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity. Dark matter makes up 30.1 percent of the matter-energy composition of the universe; the rest is dark energy (69.4 percent) and “ordinary” visible matter (0.5 percent).
Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by observing electromagnetic radiation. Dark matter is material that cannot be seen directly.
Explanation:
Hope It helps
Have A Nice Day : )
A group of scientists is studying observable matter in a cluster of galaxies. The duster remains intact due to the gravitational pull.
What is a galaxy?A galaxy is a collection of stars, stellar remains, interstellar gas, dust, and dark matter that are gravitationally bonded together.
Dark matter is a component of the universe whose gravitational pull can be detected rather than its luminosity. The universe's matter-energy ratio is made up of 30.1 percent dark matter, 69.4 percent dark energy, and “regular” visible matter (0.5 percent).
Since dark matter is made up of particles that do not absorb, reflect, or emit light, it is impossible to identify it through electromagnetic radiation observation. Dark matter is a substance that cannot be directly observed.
Therefore, a team of researchers is examining the material that can be seen in a clump of galaxies. Due to the gravitational force, the duster is unharmed.
To learn more about duster, refer to the link:
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Difference between Laboratory Thermometer and Clinical Thermometer.
Explanation:
Can you please mark me the brillantest?
Which answer is it for number 7
Answer:
The answer is I
The 4 one represents Solids coz in solids atoms are tightly packed
which of these gaseous elements is least reactive hydrogen helium nitrogen or oxygen
Answer: Nobel gases
i dont know what the options were but i hope that helped
Calculate the empirical formula for acetaminophen(Tylenol)
what is combined to get calcium chloride
Answer:
See below
Explanation:
This is a simple reaction.
Calcium and chlorine molecule are combined to get calcium chloride.
Ca + Cl₂ → CaCl₂
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807In Natural selection, who/what makes the decision about which traits are desirable and get passed to future generations?
please need help asap thank you.
Answer:
Different alleles and genes determine what gets passed down.
Explanation:
Its a pretty weird/ open ended question, but the alleles that help an organism survive, will be passed down more often because they are more "fit" and can out survive its competitors within a certain species.
Which of the following methods of heat transfer causes the tectonic plates to move?
Conduction
Convection
Evaporation
Radiation
5.27x10^45 molecules of h20 is how many moles
Answer:
6.02 × 10^23 molecules = 1 mole
5.27 × 10^45 molecules = x
x = 5.27 × 10^45/ 6.02 × 10^23 × 1
= 8.754 × 10^21 mol
I don't know if it's correct but based on the question that was the only way I saw how to work it out
Atoms with the same number of protons but with different electrical charges are called:
Answer:
It is called ions
Explanation:
What can form along faults when pushed together or pulled apart?
O Mountains
O Volcanoes
O Both
Answer:
Both
Explanation:
if you pull a mountain a part that would be great consequences and if a volcano breaks there will be fire .
Nivel de energia maximo de 20Ca
What is the one defining abiotic factor of a desert?
cold temperatures
high winds
little or no rainfall
high humidity
Hello! :p .
deserts are known to have little to no rain fall & drop to very low temperatures at night! I hope this helps!
Answer: little or no rainfall
Explanation: Precipitation, sunlight, and temperature are all abiotic factors.
Deserts have a lack of rainfall.
Some deserts are hot, some deserts can be cold too.
Abiotic factors are extreme temperatures of the day and night the fast winds the strong amount of sunlight scarcity of water
In a covalent bond between identical atoms, the electrons are shared between the atoms. If the atoms are not identical, the electron distribution is so that the electrons are closer to one atom than the other. This type of bond is called a(n) covalent bond.
Answer:
If the atoms are not identical, the electron distribution is electrons are closer to one atom than the other. This type of bond is called a(n) covalent bond.
Explanation:
Write the chemical formulas and names for the following ionic compounds. Strontium and hydroxide
Answer:
Sr(OH)2
Explanation:
Strontium hydroxide, Sr(OH)2, is a caustic alkali composed of one strontium ion and two hydroxide ions. ... Sr(OH)2 exists in anhydrous, monohydrate, or octahydrate form.
What effect do shiny metals have on radiant energy?
Answer: Metals conduct heat and reduce the kinetic energy within the components that need to remain cool.
Explanation:
Prepare and name an alcohol by using the following reactants
Hex-1-ene and a water molecule write the complete reaction.
Answer:
Alcohol will form at more substituted carbon due to carbocation rearrangement so 2-hexanol
Explanation:
Well if it’s acid catalyzed
Which sentence best describes what happens during a change of state from a solid to a liquid?
A. The temperature stays the same and the particle speed increases
B. The temperature increases and the particle speed stays constant.
C. The temperature decreases and the particle speed decreases.
D. The temperature stays the same and the particle speed stays constant.
Answer:
The temperature stays the same and the particle speed stays constant
Give one use of magnesium chloride
Answer:
Magnesium Chloride is used as a precursor magnesium metals.
Explanation:
2. Transfer in energy to reach the highest amount of kinetic energy for both substance B and C.
3. Slowly transfer out energy from each substance. Note the temperature at which each substance changes phase.
Substance B changed to a liquid at
ANSWER: °C.
Substance C changed to a liquid at
ANSWER: °C.
For Science please answer the questions with the word "ANSWER"
4. Based on your observations above, which substance needed a greater decrease in kinetic energy in order to change phase?
The substance with
(medium or low) ANSWER: Pick which one it is!
attraction needed more energy transferred out in order to change phase.
The change in phase of a substance is called a physical change. The substance C with low molecular attraction needs more energy transferred out and thus its kinetic energy have to be decreased to change from gas to liquid.
What is energy transfer?Energy can neither be created nor be destroyed. However it can be transferred from one form to the other and thus total energy of a system is conserved.
In gaseous state molecules or atoms are far apart and have minimum intermolecular forces of attraction whereas in liquid state they have medium molecular attraction and are a bit close than they are in gas state.
When a substance changes from gas state to liquid state its molecules condenses and becomes more close to each other forming higher molecular attraction.
The gas B have medium molecular attraction and thus will easily liquified with minimum energy transfer whereas, gas C is of less molecular attraction having higher kinetic energy and thus more have to transfer more energy out to liquify.
To find more about physical changes, refer the link below:
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Rebekah finds that a solution of sugar in water has a volume of 1. 32 fl. Oz. How should she report this amount using the metric system? (1 fl. Oz. = 29. 6 mL) 0. 403 m 1. 40 qt 37. 5 g 39. 1 mL.
Rebekah reports the volume of sugar solution using metric system as 39.1 mL. Thus, option D is correct.
The metric system has been the measurement system introduced in 1790s. The system has mediated the units for the measurement of volume, mass, length.
The volume has been the space that has been occupied by matter. The volume can be denoted with SI unit L. However, the another accepted unit for volume has been mL.
Thus, the volume of sugar solution has been reported in mL.
The given sugar solution has volume of 1.32 fl. Oz
The volume in mL can be given as:
[tex]\rm 1\;fl\;Oz=29.6\;mL\\1.32\;fl\;Oz=1.32\;\times\;29.6\;mL\\1.32\;fl\;Oz=39.1\;mL[/tex]
The volume of the sugar solution reported by Rebekah on the metric scale has been 39.1 mL. Thus, option D is correct.
For more information about the metric system, refer to the link:
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What is the wavelength of the above wave?
Answer:
well what above wave?? do you have a picture
Explanation:
What color does red cabbage juice change in ammonia?
Answer:
Green
Explanation:
Ammonia turns the cabbage juice into a blue/green color because it is a base, a material that tastes bitter and makes an acid neutral.
Answer:
green
Explanation:
I did the experiment
What was the first person who invented a light bulb
Answer:
Thomas edison would be you're asnwer
Answer: The person who invented the light bulb was Thomas Edison
Explanation:
molecules diffusing with the concentration gradient through a protein channel is
Answer:
Molecules move up the concentration gradient in facilitated diffusion which requires ATP to be used as molecules naturally move from high to low concentration
Explanation:
