Answer:
Gender
Explanation:
Students conduct a lab in which they neutralize an acid. Which of the following
is the last thing students should do before leaving the lab area?
The missing group of choices is as follows:
A. disassemble the equipment.
B. wash their hands.
C. record their observations.
D. clean the lab tables.
Answer:
The correct answer is - B. washing their hands.
Explanation:
Neutralization of an acid involves the reaction of the acid with a strong or week base ( on the basis of acid strength) which leads to the production of salt and water in aqueous solution.
Washing hand acid could be more dangerous as the acid reacts violently with water, however, after the neutralization of acid, there should be normal safety measures which are before leaving the lab one should wash their hand as chemicals used might be toxic or cause harmful effect to an individual.
Thus, the correct answer is - B. washing their hands.
A mass of 2 kg of acetylene is in a 0.045 m3 rigid container at a pressure of 4.3 MPa. Use the generalized charts to estimate the temperature.
Answer:
361 K
Explanation:
From the tables:
[tex]P_r=4.3/6.14=0.7,T_c=308.3\ K, R=0.2193\ kJ/kgK\\\\Volume (V)=0.045m^3, mass(m)=2kg\\\\v=V/m=0.045/2=0.0225\ m^3/kg[/tex]
Given that:
[tex]v=\frac{ZRT}{P}[/tex]
From the charts, at [tex]P_r=0.7,Z_g=0.59,T_r=0.94[/tex]
[tex]v_g=\frac{0.59*0.3193*0.94*308.3}{4300}=0.0127\ m^3/kg\ which\ is\ small\\ \\At\ T_r=1,Z=0.7,v=\frac{0.7*0.3193*1*308.3}{4300}=0.016\ m^3/kg\\\\At\ T_r=1.2,Z=0.86,v=\frac{0.86*0.3193*1.2*308.3}{4300}=0.0236\ m^3/kg[/tex]
Interpolating, we get [tex]T_r=1.17[/tex], T = 361 K
A student is given a sample of matter to classify. The sample is uniform in color and texture. Based on this information, the student can determine which of the following?
Based on these data, what can Benito safely conclude about the sample?
Group of answer choices
A.The sample is not a heterogeneous mixture.
B.The sample is not a homogeneous mixture.
C.The sample is not a compound.
D.The sample is not an element.
Answer:
A.The sample is not a heterogeneous mixture.
Explanation:
A homogenous mixture is a mixture that is not chemically bonded, but it is uniform in its composition.
An element is made up of one type of atom. An element is uniform in its composition (i.e. color, texture).
A compound is made up of more than one type of element or atom chemically bonded together. A compound is uniform in its composition (i.e. color, texture).
A heterogeneous mixture is a mixture that is not uniform in composition. i.e. it does not have the same color or texture.
The conclusion that the student can arrive at is that "the sample is not a heterogeneous mixture."
A heterogeneous mixture is composed of more than one substance. Hence, a heterogeneous mixture is likely not to have more than one color and not have a uniform texture.
Contrarily, we are told that the sample is uniform in color and texture. This means that it is clearly not a heterogeneous mixture. We do not have enough information tell if the sample is a compound or an element.
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Describe one limitation of geothermal energy?
What is the name of the element that has 20 protons in the its nucleus ? *
Answer:
Calcium.
Explanation:
Calcium has an atomic number in the periodic table equivalent to 20.
Good luck, hope this helped!
you are interested in confirming how much fluoride is in toothpaste. one tube of toothpaste lists its ingredients as glycerol, sorbitol, sodium laurel sulfate, calcium carbonate, 0.15% sodium fluoride and a trace of hydrogen peroxide.(c) What substances comprise the sample
Answer:
Sodium fluoride
Explanation:
Fluoride is a common chemical found in toothpastes. In this tube of toothpaste, let's examine the constituents of the ingredients involved
glycerol, C₃H₈O₃⇒ carbon, hydrogen and oxygen
sorbitol, C₆H₁₄O₆⇒ carbon, hydrogen and oxygen
sodium laurel sulfate, CH₃(CH₂)₁₀CH₂(OCH₂CH₂)ₙOSO₃Na ⇒ carbon, hydrogen, oxygen, sulfur, sodium
sodium fluoride, NaF ⇒ sodium and fluorine/fluoride
hydrogen peroxide, H₂O₂ ⇒ hydrogen and oxygen
From the above, the substance/ingredient that comprises the chemical (fluoride) is sodium fluoride
10 POINTS : What are 4 things created from Big Bang?
Answer:
:0
Explanation:
One second after the Big Bang, the universe was filled with neutrons, protons, electrons, anti-electrons, photons and neutrinos.Jun 17, 2017
If there is a chemical change it will remain the same properties because a new substance was formed
Which of the following is a neutralization reaction?A. Na2O(s) + H2O(a) rightarrow 2NaOH(s).B. 4Na(s) + O2(g) rightqrrow 2Na2O(s).C. NaOH(s) + HCl(aaq) rightarrow NaCl(s) + H2O(aq).D. 2Ca(s) + O2(g) rightarrow 2CaO(s).
Answer:
C. NaOH(s) + HCl(aaq) rightarrow NaCl(s) + H2O(aq)
Explanation:
A neutralization reaction may be defined as the reaction where an acid when it reacts with some base, the products formed are a salt and water.
Simply, we can write,
acid + base ---> salt + water
Here in option (C),
NaOH is sodium hydroxide is an base
HCl is hydrochloric acid
NaCl is sodium chloride and is the common salt
H20 is water
So, option C). NaOH(s) + HCl(aaq) -----> NaCl(s) + H2O(aq) is a neutralization reaction.
In which environment would a forensic scientist not be found?
In laboratories, analyzing evidence samples
In the field, collecting evidence from crime scenes
At colleges and universities, teaching new scientific techniques
In a police interrogation room, questioning the suspect
The correct answer is D. In a police interrogation room, questioning the suspect.
Explanation:
Forensic scientists are experts who use science as part of criminal investigations. Indeed, the main role of these experts is to deal with the evidence related to the crime to help authorities understand how the crime occurred and who was involved in this.
Because of this, the forensic scientist's role includes collecting evidence, analyzing samples, participating as witnesses in trials, and in some cases teach other experts about techniques. However, forensic scientists cannot interrogate suspects as they only deal with evidence and this process is in charge of the police.
Answer now!!! Is air an element?
Answer:no
Explanation: air is made of matter and matter is not an element
Answer: "Air is one of the four classical elements in ancient Greek philosophy and in Western alchemy."
Give the electron configurations for the following ions: Al3+, Ba2+, Br- and O2-
Explanation:
Al3+ has 10 electrons. The electronic configuration is;
1s² 2s² 2p⁶
Ba2+ has 54 electrons. The electronic configuration is;
1s² 2s² 2p6 3s² 3p⁶ 3d10 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶
Br- has 37 electrons. The electronic configuration is;
1s² 2s² 2p6 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶
O2- has 10 electrons. The electronic configuration is;
1s² 2s² 2p⁶
Aluminum has a density of 2.70 g/cm3 . What would the volume be in in3 of a piece of aluminum that weighs 185.3 g?
Answer:
The volume in in³ is 4.19 in³
Explanation:
To determine the volume in in³ ( cubic inches),
First, we will find the volume in cm³
From the question,
The density of aluminum = 2.70 g/cm³
Mass of the aluminum = 185.3 g
From,
[tex]Density = \frac{Mass}{Volume}[/tex]
Then,
[tex]Volume = \frac{Mass}{Density}[/tex]
Hence,
The volume of the aluminum in cm³ is
[tex]Volume = \frac{185.3 g}{2.70g/cm^{3} }[/tex]
[tex]Volume = 68.63[/tex] cm³
This is the volume in cm³
Now, for the volume in in³
1 in = 2.54 cm
∴ 1 in³ = 16.3871 cm³
Now,
If 16.3871 cm³ = 1 in³
Then, 68.63 cm³ = [tex]x[/tex]
[tex]x =\frac{68.63 \times 1 }{16.3871}[/tex]
[tex]x =4.19[/tex] in³
Hence, the volume in in³ is 4.19 in³
Answer:
4.19 g/cm3
Explanation:
40 points
Examine the table and write down what should be in each row below.
Write your answers on different lines for each row and place a common in
between each answer in that same row.*
Name
Symbol
Atomic
number
Mass
Number
Number of
neutrons
Number of
Electrons
Charge
Lithium-5
su
3
SB
1601
ISN
7
25Na
187
Your answer
Answer:
I am so confused about this i am so sorry but i cant there is to much going on
Explanation:
Sun2
Sun3
Sun4
Sun5
Sun6
Sun7
Sun8
Sun9
Sun10
Why do scientists use the scientific method?
A. It helps them analyze their data.
B. It helps them come up with testable scientific question.
C. It helps them prove their hypotheses.
D. It helps them avoid mistakes and produce reliable information.
Answer: D; It helps them avoid mistakes and produce reliable information
Explanation:
It says correct on my APEX test
How many significant figures? A) 1234500_______ B) 1230.0_____ C) 0.10220____ D) 34560000______ E) 0.0000302010_______ F) 0.02050______ G) 1.250 x 105_____
Answer:
A) 5 sig figs
B) 4 sig figs
C) 4 sig figs
D) 4 sig figs
E) 5 sig figs
F) 3 sig figs
G) 5 sig figs
Explanation:
work for G- 1.250 x 105= 131.25
Significant digits/ figures are indeed the number in a value, typically a measure the contributes to the stock's accuracy. It's very first non-zero digit is being used to begin counting significant digits.
Any digits else than zero are relevant. In this, the number of digits is used to express a measurable or calculated amount.
Given:
[tex]A)\ 1234500 \\\\ B)\ 1230.0\\\\ C)\ 0.10220\\\\ D)\ 34560000\\\\ E)\ 0.0000302010\\\\ F)\ 0.02050 \\\\ G) \ 1.250 \times 10^5 \ \ OR\ \ 1.250 \times 105[/tex]
To find:
Significant figures=?
Solution:
For A, there are 5 significant figure.For B, there are 5 significant figure with 1 decimals.For C, there are 5 significant figure with 5 decimals.For D, there are 4 significant figure.For E, there are 6 significant figure with 10 decimals.For F, there are 4 significant figure with 5 decimals.For G, there are 9 significant figure with 8 decimals OR it has 3 significant figure.Learn more:
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What is the atomic mass of element X if 10.69 g XCl3 contains 5.55 g X?
Answer:
Atomic mass of element X = 115 g/mol (Approx)
Explanation:
Given:
Amount of XCl3 = 10.69 gram
Amount of X = 5.55 gram
Find:
Atomic mass of element X
Computation:
Moles of Cl = [Mass of Cl / Molar mass of Cl )
Moles of Cl = [(10.69 - 5.55 ) / 35.5]
Moles of Cl = 0.14479 (Approx)
Moles of X = 0.14479 / 3
Moles of X = 0.04826
Atomic mass of element X = 5.55 / 0.04826
Atomic mass of element X = 115 g/mol (Approx)
Why is air considered a homogeneous mixture
Explanation:
Because each layer of the Earth's atmosphere has a different density, each layer of air is its own homogeneous mixture.
Angela wrote some lines of code that she wants to test. She will need to use
Answer: A Prompt
Explanation:
Answer: for the answer a prompt is wrong the right answer is idle
Explanation: this is correct for edge 2020 trust me sorry if im wrong
2.600 * 10 ^ - 5 * 6.100 * 10 ^ - 5 Express in scientific notation
Answer:
hope its help you
Explanation:
2.600 × 10^-5 × 6.100 × 10^-5 = 1.586 × 10-9
what are the inputs and outputs of a hydroelectric dam?
(science 7th grade)
Answer:
Does this help?
An object has a mass of 10 grams and a volume of 5 cm3. What is the density of the object
Answer:
.0002
Explanation:
d=m/v
=10g/5cm3
=2g/come
=.0002 kg/cm3
A block of aluminum occupies a volume of 17.8 mL and weighs 51.3 g. What is its density?
Answer:
2.88 g/mL
Explanation:
density = mass/volume
= 51.3/ 17.8
=2.88 g/mL
plz mark as brainliest if it helps you
The average volume of a cotton ball is about 5.50 mL. If the mass of the cotton ball is 8.53 g, what is the density of cotton?
Answer:
Explanation:
5.5 I believe.
Which element on the periodic table in the 8th column has the largest radius
Answer:
D. Rn
Explanation:
The radius increases as you go down the column
Periodic table is the arrangement of chemical elements in order of their atomic number. Atomic number of chemical elements is the number of protons in the nucleus of an atom of that chemical element.
Atomic Radius is the distance between the nuclei of two atoms of a chemical element.
Atomic Radius of chemical elements increases from top to bottom on the periodic table.
He (Helium)
He (Helium)Ne (Neon)
He (Helium)Ne (Neon)Ar (Argon)
He (Helium)Ne (Neon)Ar (Argon)Kr (Krypton)
He (Helium)Ne (Neon)Ar (Argon)Kr (Krypton)Xe (Xenon)
He (Helium)Ne (Neon)Ar (Argon)Kr (Krypton)Xe (Xenon)Rn (Radon)
Radon (Rn) has the largest atomic radius amongst the chemical elements in column 8 of the periodic table.
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Why is Jupiter so much larger than earth ? Check all that apply .
Answer: Its so much larger because it has a core.
Explanation:
Jupiter is proven to have a core, the planet still could have formed that core through disk instability. Enough dust could have collected and cemented together in the dense gas to form a core many times larger than the size of the Earth
Answer:
Inner planets were created at higher velocities. Outer planets attracted helium, hydrogen, and other gasses and Gases escaped from inner planets and not from outer ones.
Explanation:
What type of reaction involving stolen methylamine does Walter White use in the hit TV show Breaking Bad, in order to synthesize the dangerous drug methamphetaminr?A. Grignard reaction.B. Electrophilic Aromatic Substitution.C. Reductive amination.D. Diels-Alder.
Answer:
C. Reductive amination.
Explanation:
Walter white used reductive animation reaction to synthesize methanphetaminr. In this type of reaction, we would have ammonia reacting with ketoglutaric acid and the result would be a formation of glutamic acid. This reaction process is an important way of making amines. Many amines made in pharmaceuticals are done by this method.
what animal is most like to harmed when a beaver builds a dam
Answer:
Small fish or insects.
Explanation:
A gas in a 6.2 mL cylinder has a pressure of 1.4 atmospheres. A piston is pushed in until the gas volume is 3.1 mL, while the temperature remains constant. What's the final pressure of the gas in the cylinder?
Answer:
2.8 atm.
Explanation:
From the question given above, we obtained the following data:
Initial volume (V1) = 6.2 mL
Initial pressure (P1) = 1.4 atm
Final volume (V2) = 3.1 mL
Final pressure (P2) =?
The final pressure of the gas cylinder can be obtained by using the Boyle's law equation as shown below:
P1V1 = P2V2
1.4 × 6.2 = P2 × 3.1
8.68 = P2 × 3.1
Divide both side by 3.1
P2 = 8.68/3.1
P2 = 2.8 atm
Therefore, the final pressure of the gas cylinder is 2.8 atm
Answer:
2.8 atm
Explanation:
A potassium ion (K+) would most likely bond with _____.
Mg+
O
Cl-
Na+
Answer:
Chlorine
Explanation:
Answer:
That would be the negative ion: Cl-.
