Answers
1) the relationship is directly proportional, as temperature increases, volume increases In the same was.
2) an increase in pressure causes particles to move closer together, decreasing the volume.
3) it would increase
4)V.
5) the mass of each gas
1) The relationship between volume of a gas and its temperature, in Kelvin, assuming pressure is held constant is best shown by the statement; "The relationship is directly proportional, as temperature increases, volume increases in the same way."
2) The statement " an increase in pressure causes particles move closer together, decreasing the volume." explains the changes that occur when pressure is increased at constant temperature.
3) From the ideal gas law, the pressure increases as temperature increases
4) Following from Boyle's law; the volume decreases as the pressure increases.
5) The number of moles of each gas of each gas can be different.
Charles law states that; the volume of a given mass of gas is directly proportional to its temperature at constant pressure. This implies that, given a mass of gas, the temperature increases as the volume increases at constant temperature.
According to Boyle's law the volume of a given mass of gas is inversely proportional to its volume at constant temperature. This simply implies that as pressure increases as volume decreases(inverse proportionality and vice versa).
The pressure and temperature are directly proportional to each other when other variables are held constant.
From Avogadro's law, the volume of a given mass of gas is directly proportional to the number of moles( V α. n). Therefore, the number of moles of each gas of each gas can be different when the gases are held at the same pressure, volume, and temperature.
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What is the reason for the emission of light after the gas in a discharge tube is excited?
A)
photo-electric emission
Eliminate
B)
spontaneous radioactive reaction
C)
energy jumps by electrons due to excitation
D)
high energy reaction of the gas inside the tube
Answer:
c
Explanation:
took test on usa testprep
When gas in a discharge tube is excited to higher energy level after some seconds they return to the ground level by releasing energy in the form of light. Thus energy jumps by electron due to excitation is correct option.
What is gas discharge tube?A gas discharge tube is an electronic devise containing inert gases that ionizes and conducts results in emission of light.
When a potential is applied between the electrodes in a gas discharge tube, and the pressure is reduced, the gas particles inside forms a plasma of ions.
The electrons released when excited to higher energy level by absorbing energy and returns to the initial state by emitting energy in the form of light, the discharge tube glows.
The color emitted by the discharge tube vary based on the gas in the tube. Each type of gaseous ions emit different colors.
Therefore, the light emission in gas discharge tube is due to energy hike during electron excitation and then relaxing by emitting the light energy. Thus, option c is correct.
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Jenna thinks a banana ripens faster when placed in a paper bag. She uses careful observation and experimentation to test her hypothesis 
A. Science
B.Pseudoscience
Which of the following is a physical change?
A. Water reacting with potassium
B. Alcohol evaporating
C. Water splitting into hydrogen and oxygen
D. Alcohol burning
Explanation:
Alcohol burning
hope this helps you
The sun is 93 million miles from the earth approximately how many years would it take to travel from earth to the sun if a person flew in a spaceship at 55 miles an hour?
(Hint:begin by dividing the distance by the speed to determine the number of hours it would take. Round your answers the the nearest whole number.)
Answer:
it would take 2 years
Explanation:
93/55=1.69--->1.70------>2
Is sand a element, compound or a mixture?
Answer:s its a mixture
Explanation:
The pOH a solution of 0.04 M HCl is:________
a. 1.4
b. 10
c. 12.6
d. 13.6
e. The pOH cannot be determined
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Thus the pOH of 0.04 M HCl is 12.6. pH is a unitless quantity. The correct option is option C.
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
The concentration of HCl is 0.04 M
Concentration of H₃O⁺=0.04 M
Mathematically,
pH=-log[H⁺]
Substituting the values
pH=-log[0.04 M]
= 1.4
pOH = 14-pH = 12.6
Thus the pOH of 0.04 M HCl is 12.6. The correct option is option C.
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what is the need to refer to books before using appreciable amount of chemicals
Answer:
Prudent execution of experiments requires not only sound judgment and an accurate assessment of the risks involved in the laboratory, but also the selection of appropriate work practices to reduce risk and protect the health and safety of trained laboratory personnel as well as the public and the environment. Chapter 4 provides specific guidelines for evaluating the hazards and assessing the risks associated with laboratory chemicals, equipment, and operations. Chapter 5 demonstrates how to control those risks when managing the inventory of chemicals in the laboratory. The use of the protocols outlined in Chapter 4 in carefully planned experiments is the subject of this chapter.
Explanation:
I will give brainliest if you show work and answer correctly
1. Calculate the slope of each line using the points given. Graph each of the lines and determine if each is a positive or negative relationship. If you use graph paper, please take a photo and upload to your document.
2. Which graph(s) can not be a true measure of density? Why?
a. (24cm3, 6.0g), (12cm3, 24g)
b. (5.0cm3, 6.0g), (13cm3, 15g)
c. (5.0cm3, 4.0g), (25cm3, 24g)
d. (24 cm 3 , 8.0 g), (12 cm 3 , 22 g)
Answer:
https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:linear-equations-graphs/x2f8bb11595b61c86:slope/v/graph-from-point-slope. Answer 1
Explanation:
I only know the first one
The energy of the universe is zero and the mass of the earth is also zero. True or false and why. please I need help
Answer:
false
Explanation:
false
An atom has 15 protons and 14 Neutrons. What is the atomic number of this atom?
Answer:
Silicon
Explanation:
Therefore the isotope with 14 protons and 15 neutrons is Silicon-29.
An atom has 15 protons and 14 Neutrons. The atomic number of this atom is 14 and the element is silicon.
What is the atomic number?The atomic number of an element is its total number of protons or the total number of electrons. The atomic number is written down the element. It can be calculated by knowing the numbers of protons and electrons.
The element here is silicon, whose number of protons, electrons, and neutrons are equal, which is 14. These are the charged particles that are present in the atoms of the element.
The number of band protons is equal to an element. The atomic number will be its number of protons. The isotope with 14 protons and 15 neutrons is Silicon-29.
Thus, the atomic number of the element is 14 if it has 15 protons and 14 Neutrons. The element is silicon.
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How many significant figures are there in each of the following measured values?
a. 6.002 cm
b. 0.0020 m
c. 10.0500
Answer:
6)
a). 5.6 × 10⁵
b) 3.34 × 10⁴
c) 4.12 × 10_⁴
What is an atomic number
Answer:
the number of protons is called the atomic number
hope it helps you buddy
Answer: number of protons in an atom
Explanation:
Which element is not an alkali metal?
Hello!
Answer:
Hydrogen
Explanation:
Hydrogen (H) has one electron in its outermost shell, but it is not classed as an alkali metal since it is not a metal but a gas at room temperature.
Answer:
hydrogen, lithium, sodium element are not alkali metal
Aqueous aluminium bromide and solid zinc are formed by the reaction of solid aluminum and aqueous zinc bromide. Write a balanced chemical equation for this reaction.
Answer:
3 ZnBr2(aq) + 2Al (s) ====>2AlBr3 (aq) + 3 Zn(s),
Please help ASAP!!!!!!!
Answer:
Chemists develop safer and more effective fertilizers and pesticides .Chemists develop more productive and safer crops .Explanation:
Agriculture means food producingHow many moles of Al2O3 are contained in 45.1 g of Al2O3?
Answer:
0.44mol
Explanation:
1mol/102g=xmol/45.1g
-> x=(45.1x1)/102
x=0.44mol
Rolls of foil are 300mm wide and 2.020mm thick. (The density of foil is 2.7 g/cm^3). What maximum length of foil can be made from 1.40 kg of foil?
Answer: 8556 mm, or 855.6 cm (8560 mm to 3 sig figs)
Explanation: Convert mm to cm by dividing by 10 (1cm/10mm)
Find the area of the foil face in cm^2 (30cm*0.2020cm) = 0.606 cm^2
Calculate the volume occupied by 1.40 kg of foil in cm^3. 1.40kg = 1400g
1.400g/(2.7 g/cm^3) = 518.5 cm^3 for 1.40 kg Au
Volume = Area (of the face) * Length
We want Length:
Length = Volume/Area
L = (518.5 cm^3/0.606 cm^2)
L = 855.6 cm (8556 mm) Round to 3 sig figs (856 cm and 8560 mm)
Which one is the strongest acid?
•Formic acid
•oleic acid
•Malnoic acid
•None
How many names make up binomial nomenclature?
A(3)
B(4)
C(1)
D(2)
If 35.6 g of nitrogen with 7.69 g of hydrogen are combined in a closed system, what mass of ammonia will be produced?
Consider the balanced reaction,
N₂ + 3 H₂ ⇒ 2 NH₃
which says that 1 mole of nitrogen gas combines with 3 moles of hydrogen gas to produce 2 moles of ammonia gas.
Look up the molar masses of each element:
• N has a molar mass of 14.007 g/mol
• H has a molar mass of 1.008 g/mol
Then the reaction starts with
• (35.6 g) (1/28.014 mol/g) ≈ 1.27 mol N₂
• (7.69 g) (1/2.016 mol/g) ≈ 3.81 mol H₂
which means we have nearly exactly 3 times as many moles of H₂ as we do of N₂. These will combine to make 2 * 1.27 = 2.54 moles of NH₃, which has a molar mass of 17.031 g/mol, and so the reaction produces
(2.54 mol) (17.031 g/mol) ≈ 43.3 g NH₃
A particular medication dosage is 45.0mg/kg of body weight. what is the mass in mg of the medication a child weighing 33.5lb
Answer:
Dosage of drugs is dependent on the body weight of a person. The route of administration also plays crucial role in determining the dosage of the drugs. The calculation of dosage of drugs based on the bodyweight is calculated by the multiplication of body weight and dosage.
Explanation:
The medication dosage is given as 45mg/kg. To calculate the mass of dosage a child will require of body weight 33.5lb will be:
[tex]\text{Dose} = \text{Body weight} \times \text{Dosage}[/tex]
Therefore, converting the pounds to kg, it will be:
[tex]33.5\;\text{lb} = 15.19\;\text{ kg} \;(1\;\text{lb} = 0.4\;\text{ kg})[/tex]
Thus, dose of medication required will be:
[tex]\text{Dose} = 15.19 \: \times \: 45[/tex]
[tex]\text { Dose} = 683.8\: \text { mg}[/tex]
Whoever answers I’ll give brainliest!
13. Find the total number of atoms present in the following molecules. a. 5 H₂O b. Zn Cl₂
Please
Answer:
5H²O= 23
ZnCl²=135
have a great day
If 125 cal of heat is applied to a 60.0-g piece of copper at 24.0 °C, what will the final temperature be? The
specific heat of copper is 0.0920 cal/(g. "C)
Answer:
id answer but you only put the points at "5"
Explanation:
soooo......sorry.....
[tex]x^{2} blelllelelele[/tex]not
hehe
why is water a compound but hydrogen an element
Compounds are made of more than one element hence water is made of 2 Hydrogen and one Oxygen, but nacent Hydrogen is single hence it is an element.
What is the mass number for Iron-58?
Answer:
58
Explanation:
mass number of iron 58 is 58
What is the formula of the compound in which the atom combining ratios are:
carbon : hydrogen : chlorine = 2:5:1
Enter elements in the order given:
Please help me with this
Answer: Carbon, hydrogen oxygen
Explanation:C2H5OH
Can someone plz help me answer this question
Answer:
10 ml
Explanation:
The graduated cylinder contains 19 ml of water before the silver pellet is placed inside. Afterwards, the graduated cylinder measures 29 ml of water. Therefore the pellet displaced 10 ml of water. ( 29ml - 19ml = 10ml )
For two variables in a direct proportion, what is the result of doubling one variable?
Answer:
the other variable is also doubled
Explanation:
direct proportion, same thing has to happen to both variables
If you change the number of neutrons in an atom, you will also change its -
charge
element.
o
number
d
isotope.
