Answer:
false
true
true
Explanation:
false - changing the hypothesis to meet your needs is not a good researcher
true - when you can further analyze and explain then you have a successful experiment even if it's not what you expected
true - successful experiments do not end there. they can lead to more in depth questions.
Determine the molecular and empirical formulas of the following:
a. the organic solvent benzene, which has six carbon atoms and six hydrogen atoms.
b. the compound silicon tetrachloride, which has a silicon atom and four chlorine atoms and is used in the manufacture of computer chips.
c. the reactive substance diborane, which has two boron atoms and six hydrogen atoms
d. the sugar called glucose, which has six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
Answer:
the answer is b im pretty sure
Explanation:
sorry if im wrong
The empirical formula for benzene is CH. The molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex]. The empirical formula is also known as the simplest basic formula.
What is molecular formula ?A molecular formula is indeed a formula derived with molecules that corresponds to the total number of distinct atoms in the molecule of a chemical. A subscript inside a molecular formula denotes the number for each type of atoms in the substance's molecule.
The empirical formula provides the most basic formula for something like a compound, defined by the ratio between subscripts of the formula's smallest entire number of constituents. It is also known as the simplest basic formula. An empirical formula is the formula of a material given with the least integer subscript. The empirical formula for benzene is CH. The molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex].
Therefore, the molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex].
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What structure of the earth that cover the mantle and is the hard outer shell, the surface on which we are living.
Answer: Hello There!....................
Lithosphere
The lithosphere is the rocky outer part of the Earth. It is made up of the brittle crust and the top part of the upper mantle. The lithosphere is the coolest and most rigid part of the Earth.
Explanation:
Mark me brainest please. Hope this helps. Anna ♥
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),
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
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)
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:
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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
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 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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Is sand a element, compound or a mixture?
Answer:s its a mixture
Explanation:
How many miles can you drive on 5 gallons of gas
Answer:
you travel 100 miles in 5 gallon of gas
20 miles in 1 gallon of gas
how many 100 mg servings are there in 30g?
Answer:
300 servings
Explanation:
there are 1000mgs in every gram so divide that by 100 to get the servings which is 10 then multiply it by 30 , once for each gram. and you get 300.
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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What's you favorite food
Answer:
all of it
Explanation:
my favourite food is pasta.
Whoever answers I’ll give brainliest!
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 property is not used to separate a mixture ?
Answer:
Conductivity
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
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:
3
Examine the diagram of a cell above. Based on the description in this
passage, which part of the organism performs a function similar to the
part of the cell marked with the arrow?
From the diagram (see the attached image), the part of the organism that performs a function similar to the part of the cell marked with the arrow would be the brain.
The part marked with the arrow represents the nucleus of the cell.
The basic function of the nucleus is to control all cellular activities such as reproduction, homeostasis, respiration, etc. The function of the brain is also to control all the physiological, reproductive, etc. activities of the organism's body.It is then safe to infer that the nucleus of a cell and the brain of an organism are functionally similar. Hence, the part of the organism that performs a function similar to the part of the cell marked with the arrow is the brain.
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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]
how many grams are in one mole of CH3CO2H ?
Answer: 60.2g
Explanation:
One mole acetic acid weighs 60.2g
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
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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how today's pharmaceutical
Answer:
not workin right
Explanation:
Answer:
According to the Indian Economic Survey 2021, the domestic market is expected to grow 3x in the next decade. India's domestic pharmaceutical market is estimated at US$ 42 billion in 2021 and likely to reach US$ 65 billion by 2024 and further expand to reach ~US$ 120-130 billion by 2030.
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.
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
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]
