Answer:
HE coracle—as I had ample reason to know before I was done with her—was a very safe boat for a person of my height and weight, both buoyant and clever in a seaway; but she was the most cross-grained, lop-sided craft to manage. Do as you pleased, she always made more leeway than anything else, and turning round and round was the manoeuvre she was best at. Even Ben Gunn himself has admitted that she was "queer to handle till you knew her way."
Explanation:
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
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
Is sand a element, compound or a mixture?
Answer:s its a mixture
Explanation:
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
Whoever answers I’ll give brainliest!
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),
If you change the number of neutrons in an atom, you will also change its -
charge
element.
o
number
d
isotope.
Which statement best describes the light that will cause emission of electrons from a given metal through the photoelectric effect?
light with a low enough intensity
light with a high enough frequency
light with a high enough intensity
light with a low enough frequency
Answer:
b
Explanation:
edge 2021
The best describes the light that will cause emission of electrons from a given metal through the photoelectric effect is " light with a high enough frequency. "
What is photoelectric effect?When electromagnetic radiation, like light, strikes a substance, the photoelectric effect would be the generation of electrons.
What is electrons?The smallest atom-forming particle is an electron, which has negatively charged.
The photoelectric effect would be a phenomenon where electrically charged particles were released from or contained within a substance as electromagnetic radiation will be absorbed. The effect is often referred to as the emission of electrons from such a metal plate when light strikes it.
Therefore, the correct answer will be option (B).
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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)
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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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
Bella wants to know which mode of transportation is the fastest for getting from her home to the grocery store. She can drive her car, ride her bike, walk, or charter a helicopter. What is the Independent, dependent, controlled variables and hypothesis
Answer
I think a helicopter would be fastest, just sayin.
Explanation:
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
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.
how many grams are in one mole of CH3CO2H ?
Answer: 60.2g
Explanation:
One mole acetic acid weighs 60.2g
A sample of solid X is carefully weighed and put inside a vented flask. The flask is heated until oxygen gas starts being produced. After no more oxygen gas is produced, the contents of the flask are removed and weighed, and from the decrease in weight the value of O may be calculated. physical or chemical
Answer:
I honestly have no clue
Explanation:
What's you favorite food
Answer:
all of it
Explanation:
my favourite food is pasta.
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
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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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
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
What is the mass number for Iron-58?
Answer:
58
Explanation:
mass number of iron 58 is 58
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
Equal masses of carbon dioxide (CO2) and oxygen (O2) are mixed. What is the mole
fraction of oxygen in this mixture?
A) 0.4211
B)0.2500
C)0.7500
D) 0.661
The mole fraction of oxygen in this mixture is = 0.5789 which is not listed in the options. while the mole fraction of carbon dioxide = 0.4211 ( A )
Given that :
Mass of carbon dioxide = mass of oxygen
lets assume the given mass = x
first step : determine the moles of CO₂ and O₂
moles of CO₂ = mass / molar mass of CO₂
= x / 44
moles of O₂ = mass / molar mass of O2
= x / 32
∴ mole fraction of O₂ = moles of O₂ / ( Total moles in the mixture )
= [tex]\frac{x}{32} / ( \frac{x}{44} + \frac{x}{32} )[/tex]
= [tex]\frac{44*32*(x)}{32 * 76 *(x)}[/tex] = 0.5789
While the mole fraction of Carbon dioxide = 1 - 0.5789 = 0.4211
hence the mole fraction of oxygen in this mixture = 0.5789 while the mole fraction of Carbon dioxide = 0.4211
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Calculate the mass of 1 molecule of water
with step
Molecular Mass of water:-
[tex]\\ \sf\longmapsto H_2O[/tex]
[tex]\\ \sf\longmapsto 2(1u)+16u[/tex]
[tex]\\ \sf\longmapsto 2u+16u[/tex]
[tex]\\ \sf\longmapsto 18u[/tex]
[tex]\\ \sf\longmapsto 18g[/tex]
1mole of water weighs 18g
We know
[tex]\\ \sf\longmapsto 1mol=6.023\times 10^23molecules[/tex]
Mass of one molecule:-
[tex]\\ \sf\longmapsto \dfrac{18}{6.023\times 10^23}[/tex]
[tex]\\ \sf\longmapsto 2.98\times 10^24g[/tex]
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:
When 47.1 J of heat is added to 14.0 g of a liquid, its temperature rises by 1.80 ∘C. What is the heat capacity of the liquid?
Answer:
[tex]\boxed {\boxed {\sf 1.87 \J/g \textdegree C}}[/tex]
Explanation:
We are asked to find the specific heat capacity of a liquid. We are given the heat added, the mass, and the change in temperature, so we will use the following formula.
[tex]q= mc\Delta T[/tex]
The heat added (q) is 47.1 Joules. The mass (m) of the liquid is 14.0 grams. The specific heat (c) is unknown. The change in temperature (ΔT) is 1.80 °C.
q= 47.1 J m= 14.0 g ΔT= 1.80 °CSubstitute these values into the formula.
[tex]47.1 \ J = (14.0 \ g) * c * (1.80 \textdegree C)[/tex]
Multiply the 2 numbers in parentheses on the right side of the equation.
[tex]47.1 \ J = (14.0 \ g * 1.80 \textdegree C)*c[/tex]
[tex]47.1 \ J = (25.2 \ g*\textdegree C) *c[/tex]
We are solving for the heat capacity of the liquid, so we must isolate the variable c. It is being multiplied by 25.2 grams * degrees Celsius. The inverse operation of multiplication is division, so we divide both sides of the equation by (25.2 g * °C).
[tex]\frac {47.1 \ J}{(25.2 g *\textdegree C)} = \frac {(25.2 g *\textdegree C)*c}{{(25.2 g *\textdegree C)}}[/tex]
[tex]\frac {47.1 \ J}{(25.2 g *\textdegree C)} =c[/tex]
[tex]1.869047619 \ J/g *\textdegree C = c[/tex]
The original measurements of heat, mass, and temperature all have 3 significant figures, so our answer must have the same. For the number we found that is the hundredth place. The 9 in the thousandth place to the right tells us to round the 6 up to a 7.
[tex]1.87 \ J/ g * \textdegree C =c[/tex]
The heat capacity of the liquid is approximately 1.87 J/g°C.
What property is not used to separate a mixture ?
Answer:
Conductivity
Explanation:
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]
