Answer:
b
Explanation:
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What is the order of decreasing ionization energy?
1. cesium, barium, lead
2. barium, lead, cesium
3. lead, barium, cesium
4. barium, cesium, lead
5. lead, cesium, barium
6. cesium, lead, barium
2. DEFINE CHEMICAL BOND IN YOUR OWN WORDS.
Answer:
chemical bond are bonds that are strong lasing between chemicals and irons and morecles
Why is it important for scientists to use the scientific method?
A. Scientists would not ask questions if the scientific method were
not used.
B. Experiments would not produce any data without the scientific
method.
C. The scientific method helps scientists get accurate, repeatable
results,
D. Using the scientific method means that the results will support the
hypothesis
Explanation:
It provides an objective, standardized approach to conducting experiments and, in doing so, improves their results. By using a standardized approach in their investigations, scientists can feel confident that they will stick to the facts and limit the influence of personal, preconceived notions.
I hope this helps you out!
Someone pls help me I will make you brain
Answer:
i cant read it but its c and a
Explanation:
my thinking faces
pls help ASSSAPPPP!!!!
Answer:
b or d
Explanation:
Answer:
The answer is B (it's reactivity)
NO2 is a reddish brown color while N2O4 is colorless. Based on this information only, which type of spectroscopy would be a good choice to determine the identity of an unknown sample that contains either
NO2 or N2O4?
Spectroscopy is is an area of science that deals with interaction of matter and the electromagnetic spectrum. Colorimetry can distinguish between a colorless and a colored substance.
The type of spectroscopy that would be a good choice to determine the identity of an unknown sample is a type of spectroscopy that deal with the interaction of visible light with matter.
A type of spectroscopy that deals with interaction of visible light with matter is colorimetry. Colorimetry can measure the concentration of a substance as a function of the amount of light that is absorbed by the substance.
Since NO2 has a reddish brown color, its concentration can be measured using colorimetry. The concentration of N2O4 can not be measured using colorimetry because it is colorless.
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When does an electrically charged object attract another object?
A. When one object is far away from the other
B. When each object is negatively charged
C. When the objects are oppositely charged
D. When each object is positively charged
Answer:
C. When the objects are oppositely charged
Explanation:
Electrostatic interactions are commonly observed whenever one or more objects are electrically charged. Two oppositely-charged objects will attract each other. A charged and a neutral object will also attract each other. And two like-charged objects will repel one another.
From Bing, this is not my work
Answer:C
Explanation:
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC! lol i think its c
Which type of fire can help prevent
larger fires in the future?
hope it helps
Someone pls help me I will make you brain
Answer: B
Explanation:
A 1.044 g sample contains only vitamin C (C6H8O6) and sucralose (C12H19Cl3O8). When the sample is dissolved in water to a total volume of 33.0 mL, the osmotic pressure of the solution is 3.69 atm at 295 K. What is the mass percent of vitamin C and sucralose in the sample?
Answer:
Refer the attachment for answer..
hope it helps you..
Help meeeeeeeeeeeeeee
Answer:
4) 2Na + Cl2 → 2NaCl
5) 2Mg + O2 → MgO
6) 2H2 + 2O2 → 2H2O
Explanation:
4) In order for it to be well balanced, yeah you've got to add 2 in front of Na before the reaction and after the reaction.
5) Add 2 in front of Mg bcuz of the same reason in number 4 but you don't have to add 2 in front of the others bcuz it's alrd well balanced.
6) Tbh for this one, it got me staring at my cat until he freaks out but like yeahh, I tried :')
Which of the responses contains all the true
statements and no others regarding
electromagnetic radiation (light)?
Which scientist is credited with developing the fist scientific atomic theory
Answer:
German chemist G.E. Stahl
Why do you think the term ionic is used to describe compounds formed from a metal element and a nonmetal element?
Answer:
All compounds form when atoms of different elements share or transfer electrons. Compounds in which electrons are transferred from one atom to another are called ionic compounds.
Explanation:
Because the positive and negative charges cancel out, an ionic compound is neutral in charge.
Which element is most likely to lose electrons in a chemical reaction?
Group of answer choices
Mg
Cl
S
Br
Answer:
Write a hypothesis for Section 1 of the lab, which is about the effect the type of material has on the absorption of sunlight on Earth’s surface. Be sure to answer the lesson question: "What factors influence the absorption of sunlight at Earth's surface?"
Explanation:
5. A football field is about 100 meters long. If it takes a person 20 seconds to run its length, how fast (what speed) were they running?
Answer:
Speed, v = 5 m/s
Explanation:
The length of the football field, l = 100 m
the person takes 20 seconds to run its length
v=
t
d
v=
20 s
100 m
v=5 m/s
Calculate the percent composition by mass of each element in NaClO2.
Answer: Divide the mass of the first dissolved component by the solution mass, and then multiply the result by 100 to calculate the mass percentage. In our example, the first dissolved compound is NaCl; the mass percent is (10 g / 136 g) x 100 percent = 7.35 percent.
Explanation: its up, look
determine the velocity of a 55-kg skier whose kinetic energy is 8900 J
Answer:
Kinetic energy = 1/2mv^2
8900 j =1/2*55*v^2
v^2=8900*2/55
v^2=323.6
v=17.98
Explanation:
why is it that lipids, such as oil, do not readily mix with water?
Answer:
Liquid water is held together by hydrogen bonds. Oils and fats not have any polar part and so for them to dissolve in water they would have to break some of water s hydrogen bonds.Water will not do this so the oil is forced to stay separate from the water.
Oil are the lipid molecule do not Mix With Water Because of Polarity. Oil and water don’t mix as it is made up of non-polar molecules while water molecules are polar.
what are the composition of lipid ?Lipids are organic biomolecule made up of carbon, hydrogen and oxygen with some other elements like phosphorus and nitrogen may be present.
A fatty acid which is an organic acid having hydrogen and general formula R-COOH where R represents hydrogen or a group of carbon and hydrogen atoms, for example stearic, palmitic and oleic acids.
Glycerol is another component which is a thick sweetish liquid, soluble in water and can react with a fatty acid. where one molecule of glycerol combines with three molecule is fatty acids by formation of a bond called ester, here ester is also known as triglyceride.
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Do you think the Clean Air Act was a good solution to the changing environment in England? Explain.
Americans breathe less pollution and face lower risks of premature death and other serious health effects. Environmental damage from air pollution is reduced. The value of Clean Air Act health benefits far exceeds the costs of reducing pollution. ... New plants and factories install modern pollution control technology.
The formula of alkanes contain 3 5 7 and 9 carbon atoms
Explanation:
In organic chemistry, an alkane, or paraffin (a historical trivial name that also has other meanings), is an acyclic saturated hydrocarbon. In other words, an alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon–carbon bonds are single.
Is it possible to have an electromagnetic wave with a wavelength (a) of 104.68 m and an energy of 3.25 x 10-27 J? Show your work.
2. You work for an environmental company as an environmental toxicologist and have been hired to determine the contaminant present in a local resident’s pool. Create a flow chart outlining how you would detect the possible presence of Fe2+ and/or Sr2+
write short notes on the following:1. Analytical chemist 2. Chemical engineer 3. Healthcare scientists 4. Forensic scientist 5. Research scientist 6. Toxicologists 7. Pharmaceutical chemist 8. Nuclear chemist 9. Industrial chemist.
Hydrogen sulfide gas is combusted with oxygen gas to produce sulfur dioxide gas and water vapour. If there is 48.4 L of oxygen available. What volume of hydrogen sulfide gas may be combusted if the pressure and temperature are held constant?
Answer:
2H2S + 3O2 → 2SO2 + 2H2O
V(O2) = 48.4 L
p = 105 kPa = 1.036 atm
T = 190 + 273 = 463 K
Ideal gas law:
pV = nRT
n = \frac{pV}{RT}n=
RT
pV
R = 0.08206 L×atm/mol×K
n(O2) = \frac{1.036 \times 48.4}{0.08206 \times 463}=1.319 \; mol=
0.08206×463
1.036×48.4
=1.319mol
According to the reaction:
n(H2S) = \frac{2}{3}
3
2
n(O2) = \frac{2}{3} \times 1.319 = 0.8798 \;mol
3
2
×1.319=0.8798mol
V = \frac{nRT}{p} \\ V(H_2S) = \frac{0.8798 \times 0.08206 \times 463}{1.036}=32.26 \;LV=
p
nRT
V(H
2
S)=
1.036
0.8798×0.08206×463
=32.26L
Answer: 32.26 L
Explanation:
This photo shows two objects: the lead in a pencil and a mineral sample.
Both are made of the element carbon. Which statement about these objects
must be true?
A. They contain the same number of atoms
B. They have the same mass
C. They consist of a single type of atom
D. They take up the same amount of space
PLS hurry I’ll give brainlist!! :>
HELPPPPP ASAPPP PLZZZZ
Answer:
9
Explanation:
i think i dont know
maybe someone tell me if I'm wrong
A scientist introduces an unknown type of particle into a cathode ray tube. The unknown particles travel in the same direction as the cathode ray. Which of the following statements is true?
A. The charge of the unknown particles is positive.
B. The charge of the unknown particles is negative.
C. The charge of the unknown particles is neutral.
Answer: B
Explanation:
Why is carbon an element and not a compound?
A. Carbon bonds easily with oxygen, but not helium.
B. All carbon atoms have the same number of protons.
o C. All carbon atoms have the same number of neutrons.
.
D. Carbon is found in all living organisms.
Answer:
Carbon is found in all living organisms.
Answer: d
Explanation: i promise I've took the k-12 test
Bromine is an element that often gains an electron to become a negatively charged ion. Potassium is an element that often loses an electron to become a positively charged ion.
Why are bromine and potassium likely to react with one another?
Bromine needs to gain one more electron to have a noble gas configuration or 8 valence electrons, & potassium needs to lose one so they make a transference of electrons in an ionic bond.
What are the functions of ionic bonding?Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, or between two atoms with sharply different electronegativities, and is the primary interaction occurring in ionic compounds.
Ionic bonding results in compounds known as ionic, or electrovalent, compounds, which are best exemplified by the compounds formed between nonmetals and the alkali and alkaline-earth metals.
The charge of a cation or anion is denoted as a superscript after the formula of the ion. A + sign denotes a positive charge resulting from loss of electrons. A - sign denotes a negative charge resulting from gain of electrons.
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A student makes two mixtures, both made of the same substances. What must be true of the two mixtures? A Both mixtures have the same density. B Both mixtures have the same temperature. C Both mixtures can be physically separated into its components. D Both mixtures are physically combined in the same proportions.
A student makes two mixtures, both made of the same substances. Both mixtures can be physically separated into its components. Therefore, option C is correct.
What is mixture ?A substance made up of two or more separate chemical compounds that are not chemically linked is referred to as a mixture. A mixture is the physical blending of two or more substances while maintaining their distinct identities. It can take the form of solutions or suspensions.
A pure substance is a single sort of matter that cannot be divided into other kinds of matter by any physical methods. A pure substance has a known and consistent composition at all times.
When two or more distinct substances physically join, a mixture is produced that can be dispersed back into its constituent parts. When two or more compounds combine to create a new substance that cannot be broken down into its constituent parts, a chemical reaction takes place.
Thus, option C is correct.
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