Answer:Gold
Explanation: it is a pure element on the periodic table
~enjoy the rest of your day
how can hydrogen gas be tested?
Answer:
Burning splint test
A splint is lit and held near the opening of the tube, then the stopper is removed to expose the splint to the gas. If the gas is flammable, the mixture ignites. This test is most commonly used to identify hydrogen, which extinguishes with a distinctive 'squeaky pop' sound. brainliest please
If you were to add salt to water , what temperature would you expect it to boil? Assume you’re at sea level
100 c
More than 100 c
Less than 100 c
Answer:
100c
Explanation:
What is the difference between pH and pOH?
Answer:
pH measures ratio of H+ ions to OH- ions of substances
pOH measures ratio of OH- ions to H+ ions of substances
Explanation:
pH is a scale which measures the ratio of H+ ions to OH- ions to identify how acidic or basic a substance is. This is because acidic substances have high amounts of H+ ions and low amounts of OH- ions, and therefore have a higher ratio of H+ to OH- ions. (And vice versa for bases, low H+ to OH- ratio) On a pH scale, acidic substances have a pH of 0 to 7, water (neutral pH, not acidic nor basic) has a pH of 7, and bases have a pH of 7-14.
pOH is very similar to pH but measures the opposite: the ratio of OH- ions (indicative of a base) to H+ ions (indicative of an acid). Therefore the pH values are reversed on the scale: Basic substances have pOHs below 7, and acidic substances are above 7 on the pOH scale.
Fundamentally, these two scales measure the same thing is the same way, one just measures the ratio one way (H+:OH-), while the other measured them the other way (OH-:H+), resulting in flipped values on the scales:
pH: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
<---Acidic---> <------Basic------->
pOH: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
<----Basic----> <-----Acidic------->
Hope this helped!
Which gas would you expect to have the fastest diffusion rate?
A. Ammonia (NH3)
B. Oxygen (O2)
C. Nitrogen (N2)
please help I have 50 questions for just SCIENCE :(
if an electrically neutral atom has 57 protons how many electrons does it have?
Answer: 57
Explanation: Because the atom is neutral, it’s #e= Protons + zero charge (for all neutral atoms)
Hence, #e= 57+0=57 electrons
An electrically neutral atom have 57 protons so it will be having 57 electrons .
What do you mean by electrically neutral atom ?An atom is electrically neutral when the overall charge of an atom is zero. The atoms are made of three subatomic particles called protons, electrons and neutrons.
Protons are positively charged particles, electrons are negatively charged and neutrons are neutral.
The number of electrons is equal to the number of protons due to which positive and negative charge cancels each other out.
According to the question,
Because the atom is neutral , it’s
Electrons= Protons + zero charge (for all neutral atoms)
Hence,
Electrons= 57+0
=57 electrons
Hence, an electrically neutral atom have 57 protons so it will be having 57 electrons .
Learn more about neutral atom , here:
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At 304 K, a 9.6 L tank contains 1.9 moles of H2 gas under an unknown pressure in atm. What is the pressure of the gas in the tank? (R = 0.0821 L*atm/mol*K)
Answer:
The pressure is 4.939 atm
Explanation:
As we know
PV = nRT
where P is the pressure
V is the volume
n is the total number of moles
R is the gas constant
and T is the temperature
Substituting the given values we get -
[tex]P * 9.6 = 1.9 * 0.0821 *304\\P = 47.420/9.6\\P = 4.939[/tex]
The pressure is 4.939 atm
Answer:
4.9 atm
Explanation:
Match each chemical reaction with the type of reaction that best describes it
Explanation:
Types of Chemical ReactionCombination Reaction.Decomposition Reaction.Displacement Reaction.Double Displacement Reaction.Oxidation and Reduction Reaction.stay safe healthy and happy.This protein takes oxygen from hemoglobin in order to
O break down stored fats for energy.
O transport water-insoluble lipids in the bloodstream.
transport oxygen from the lungs to tissues around the body.
O store it for muscle cells.
Answer:
i'm pretty sure it's 'transport oxygen from the lungs to tissues around the body'
Answer:
Transportation of Oxygen from Lungs to Tissues
When the pressure is 1.22 atm, a sample of hydrogen gas has a volume of 1.88L. What is its volume if the pressure is increased to 1.45 atm?
Answer:
1.58 L
Explanation:
Use Boyle's law, which is defined as
p1v1 = p2v2
In this case we're solving for V2 because the rest of the variables are given.
p1 = 1.22 atm
v1 = 1.88L
p2 = 1.45 atm
v2 = ?
p1v1 = p2v2
(1.22 atm)(1.88L) = (1.45 atm)(v2)
v2 = (1.22 atm)(1.88L) ÷ (1.45 atm) = 1.58 L
In the chemical laboratory, why do scientists use a mortar and pestle?
A. To increase surface area of a solute
B. To decrease surface area of a solute
C. To increase temperature of a solute
D. To decrease temperature of a solute
Answer:
A. To increase surface area of a solute
Explanation:
This refers to the most powerful means of communicating confidence and conviction A.Posture B.eye contact C.body movement
please
please
please
please
ples
please
please
please help me
Answer:
c
Explanation:
the way you move explains how confident you are
O nióbio é um metal encontrado em jazidas naturais, principalmente na firma de óxidos. Em uma jazida que contenha nióbio com número de oxidação +5, a formula do óxido predominante desse metal corresponde a:
Answer:
what
Explanation:
How many atoms are in 1.204x10^22 moles of arsenic?
Answer:
0.02 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{1.204 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.02[/tex]
We have the final answer as
0.02 molesHope this helps you
you had a 5 gram sample , how much of the original substance would remain after 1 half- life?
what is the half life though?
At 40 mph, how long does it take to travel 64 miles
Which could be the pH of an aqueous solution with a H3O+ ion concentration that is less than its OH- ion concentration?
A. 2
B. 3
C. 4
D. 9
Answer:
Explanation:
You can think of pH as "parts Hydrogen ion," but remember that the pH scale is "backwards." The pH scale ranges from 0 to 14, with zero being the most acidic (highest concentration of H+) and 14 being the most basic.
The pH of an aqueous solution will be:
D. 9
When the [tex]H_3O^+[/tex] ion concentration is less than its [tex]OH^-[/tex] ion concentration.
What does pH tell?pH is used to indicate whether a solution is acidic or alkaline depending upon the pH of the solution. If pH is below 7 then the solution is acidic, if the pH is above 7 then the solution is basic and if the pH is 7 then the solution is neutral.
When the [tex]H_3O^+[/tex] ion concentration is less than its [tex]OH^-[/tex] ion concentration this means that the solution has more [tex]OH^-[/tex] ion and this makes the solution basic.
Thus, correct option is D, i.e. pH is 9.
Find more information about pH here:
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The table shows data about abiotic factors of streams in two different watersheds.
In general, a stream with a lower temperature and more neutral pH tends to be
healthier. Based on these criteria, which watershed contains the healthier
stream?
Answer:
B
Explanation:
Can we use nuclear fusion on Earth? Why or why not?
Answer:
Explanation:
No
What are the different types of excretion?
Answer:
There are 4 excretory organs in human: The skin, the lungs, the liver, and the kidney (Urinary system). The skin excretes the sweat outside the body through numerous pores in the surface of this organ. Sweat is a mixture of three metabolic wastes: water, salts, and urea.
16. Which of the following have the same electron configuration as each other?
1. Na+1 and Ar
2. Na+1 and Ne
3. Na and Ne
4. Na and Na+1
Answer:3
Explanation:
Answer:3
Explanation:
In the combined gas law if a variable is not constant you can remove it from the equation to reveal the gas law you need to solve a problem? True or false?
Answer:
False
Explanation:
There is 1 mole of propane (C3H8) for every 3 moles CO2. How many moles of CO2 would there be if you started with 2 moles of propane instead of 1?
Answer:
[tex]1 \: mole \: of \: propane \: reacts \: with \: 3 \: moles \: of \: carbondioxide \\ 2 \: moles \: of \: propane \: react \: with \: \frac{2 \times 3}{1} moles \\ = 6 \: moles \: of \: carbondioxide[/tex]
A solution is a mixture ____. Select one: a. from which the solute can be filtered b. that has the same properties throughout c. that is heterogeneous d. in which a solid solute is always dissolved in a liquid solvent Clear my choice Check
A solution is a mixture in which a solid solute is always dissolved in a liquid solvent
Describe at least 3 phases of thr water cycle and make sure to explain The state of matter of water at each of the phases
Explain why crystallisation can't be used to prepare calcium carbonate.
Explanation:
The mechanisms by which amorphous intermediates transform into crystalline materials are poorly understood. Currently, attracting enormous interest is the crystallization of amorphous calcium carbonate, a key intermediary in synthetic, biological, and environmental systems. Here we attempt to unify many contrasting and contradictory studies by investigating this process in detail. We show that amorphous calcium carbonate can dehydrate before crystallizing, both in solution and in air, while thermal analyses and solid-state nuclear magnetic resonance measurements reveal that its water is present in distinct environments. Loss of the final water fraction—comprising less than 15% of the total—then triggers crystallization. The high activation energy of this step suggests that it occurs by partial dissolution/recrystallization, mediated by surface water, and the majority of the particle then crystallizes by a solid-state transformation. Such mechanisms are likely to be widespread in solid-state reactions and their characterization will facilitate greater control over these processes.
An apple appears red when struck by white light. This appearance is because the red light is reflected and the other colors are absorb. What color will this apple appear to be when struck by blue yet.
A. black
B. blue
C. red
D. white
When water vapor suddenly condenses near the ground,
fog can form. True or false help!!!! Pls!
Answer:
True
Explanation:
Clouds and fog both form when water vapor condenses or freezes to form tiny droplets or crystals in the air, but clouds can form at many different altitudes while fog only forms near the ground. Both fog and clouds are formed when water vapor condenses or freezes to form tiny droplets or crystals in the air.
zA 25.0 mL sample of an acetic acid solution is titrated with a 0.175 M NaOH solution. The equivalence point is reached when 12.5 mL of the base is added. The concentration of acetic acid in the sample was ________ M. A 25.0 mL sample of an acetic acid solution is titrated with a 0.175 M NaOH solution. The equivalence point is reached when 12.5 mL of the base is added. The concentration of acetic acid in the sample was ________ M. 0.365 0.119 0.0875 0.175 none of the above
Answer:
0.0875M of Acetic Acid
Explanation:
Based on the reaction of acetic acid (HX) with sodium hydroxide (NaOH):
HX + NaOH → NaX + H₂O
1 mole of acetic acid reacts with 1 mole of NaOH
That means the moles of sodium hydroxide added = Moles the acetic acid at the equivalence point.
To solve this question we have to find the moles of NaOH = Moles HX. With the moles and the volume (25.0mL = 0.0250L) we can find the molarity of the acetic acid:
Moles NaOH = Moles Acetic acid:
12.5mL = 0.0125L * (0.175mol / L) = 0.00219 moles Acetic Acid
Molarity acetic acid:
0.00219 moles Acetic Acid / 0.0250L =
0.0875M of Acetic AcidI'm like a highway system in your body. I carry necessary supplies to the parts of your body that need llen, allu
carry away wastes so your body can get rid of them. I contain blood vessels and am a system with a lot of heart.
What system am I?
1:digestive system
2:circulatory system
3: muscular system
4:skeletal system
plssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss sssssssssssssssssss sssssssssssssssssss sssssssssssssssssss sssssssssssssssssss answer this correctly
Answer:
The circulatory system
Explanation:
Hope this helps