Answer:
as in valence electrons? 5.
Answer:
Carbon has 4 Valence electrons
how do you identify an acid from its chemical formula
A small amount of liquid bromine is added to a container which is then sealed.
Br2 (l) " Br2 (g)
Which of the following do not have a nucleus? *
bacteria
virus
both bacteria and viruses do NOT have a nucleus
both bacteria and viruses DO have a nucleus
Answer:
C
Explanation:
bacteria and virus do not have nucleas. so C
if my answer helps please mark as brainliest.
what is chemical composition of the atmosphere
Answer:
nitrogen 78%, Oxygen 21%, Argon 0.9%, Carbon dioxide 0.03%, water 0-4%(depends)
Explanation:
Answer:
definition: The atmosphere is composed of a mix of several different gases in differing amounts. The permanent gases whose percentages do not change from day to day are nitrogen, oxygen and argon. Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%.
Explanation:
Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%. Gases like carbon dioxide, nitrous oxides, methane, and ozone are trace gases that account for about a tenth of one percent of the atmosphere.
Layers of the atmosphere:
- From lowest to highest, the major layers are the troposphere, stratosphere, mesosphere, thermosphere and exosphere
Salinity affects density. Choose all of the correct answers.
options:
As water temperature decreases, water density increases.
As water temperature increases, water density increases.
As concentration of salt increases, water density also increases.
As concentration of salt decreases, water density also increases.
Answer:
1 and 3 i think so i could be wrong
Salinity affects density in the following instances:
A. As water temperature decreases, water density increases.
C. As concentration of salt increases, water density also increases.
What is salinity?Salinity can be defined as a measure of the amount of salt that is dissolved in a water body. Thus, it mainly measured in gram per liters.
What is density?Density can be defined as mass per unit volume. Also, it is measured in kilogram per cubic meters.
Based on scientific records, salinity affects density in the following instances:
As the temperature of water decreases, the volume increases and as such water density increases.As concentration of salt increases, water density also increases due to an increase in the mass of the water.Read more on salinity here: https://brainly.com/question/20283396
B. Fill in the blanks with the correct answer. Choose from the choices inside the box.
1. The bones that protect the delicate organs of the body.
2. It is a long flat bone at the middle of the chest and attached to the ribs,
3. They are the bones that protrude at the base of the neck.
4, This bone connects the backbone and the legs.
5. This bone protects our brain.
6. This system of the body gives structural support and shape.
7. These muscles are connected to the bones and are responsible for movements.
8. These are involuntary muscles that are not attached to the bones.
9. These muscles are moving rhythmically, contracting and relaxing alternately to generate force to
pump blood throughout the body.
10. A system of the body that supports the skeleton and responsible for body movement.
Muscular system
skeletal system
smooth muscles
cardiac muscles
Skeletal muscles
hipbone
collarbone
axial skeleton breastbone
skull
Answer:
Answer:
Asan po yung choices?
if a sample of 4.50 moles of hydrogen gas was reacted with excess nitrogen, how many moles of ammonia gas would be produced?
Answer: 3.00
Explanation: got the answer from my teachers notes
According to stoichiometry, if a sample of 4.50 moles of hydrogen gas was reacted with excess nitrogen, 3 moles of ammonia gas would be produced.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical reactions.In the given reaction 3 moles hydrogen gives 2 moles ammonia, thus, 4.5 moles of hydrogen will give, 4.5×2/3=3 moles.
Thus, if a sample of 4.50 moles of hydrogen gas was reacted with excess nitrogen, 3 moles of ammonia gas would be produced.
Learn more about stoichiometry,here:
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The microscope has the power to show details of
an object more clearly. This is known as
Answer:
Explanation:
in order for the user to clearly view an image, the microscope must carry out two processes. ... the ability of the microscope to increase the size of the image of an object is called______. magnification. the microscope has the power to show details of an object more clearly.
The power of a microscope to show details of an object more clearly is: resolution.
A microscope can be defined as an optical device which is typically designed and developed to make an enlarged (magnified) image of a minute (very small) object, in order to show all the littlest or tiniest details (information) about the object that cannot be seen by the natural human eye.
Generally, the different types of microscopes include:
Inverted microscope.Compound light microscope.Scanning electron microscope.Polarizing microscope.In Science, the resolution of a microscope is a measure of its power to clearly show the details of an object.
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(1) How will you determine which dyes are present in the beverage that you have chosen to analyze?
(2) How will you determine the concentration of each dye present in the beverage?
(3) By what factor will you change the concentration as you monitor the absorbance/transmittance of the solution?
(4) Write a preliminary plan for your experimental procedure. Include what each member of your team will do as part of this plan.
14. An increase in temperature results in an increase in ...
(there are two correct answers)
A.Water molecules
B.The melting point
C.Pressure
D.Fun
Answer: its C. and B.
Explanation:
hopes this helps
An isotope of an element has 95 protons and 146 neutrons. What is the symbol for this
element?
Answer:
238 is the answer
Explanation:
238 - 146 + 3 = 95
Americium (95Am) is an element that has 95 protons and 146 neutrons in its nucleus of an atom.
What is Americium (95Am)?Americium is an element that has 95 protons and 146 neutrons. Its symbol is Am. Its atomic mass is 241 amu which is get by addition of proton and neutron.
So we can conclude that Americium (95Am) is an element that has 95 protons and 146 neutrons in its nucleus of an atom.
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Students in Ms. Brown demonstrated several chemical reactions but the data did not represent the law of conservation of matter in
any of the four experiments. Kai and Maria are about to add 3 grams of magnesium (Mg) to a test tube of 30 grams of hydrochloric
acid (HCI). They covered their container with a balloon as a seal. If the girls expect a chernical change as well as evidence of the
Law of conservation of matter, choose ALL of the predictions that are appropriate?
A)
There will be a rapid evolution of gas.
B)
The mass of the products will equal 339.
The solid magnesium metal will disappear.
D)
The balloon covering the container will expand.
E)
There will be a dramatic change in temperature,
Answer:
Answer: everything except E
Explanation: There was no dramatic change in temperature and i just took the assignment.
According to the law of conservation of matter, matter cannot be created not be destroyed. In this experiment, no matter loss will occur but there will be rapid evolution hydrogen gas and the balloon will expand.
What is conservation of matter?According to conservation of matter, matter can neither be created nor be destroyed but its state and properties can be changed. The total mass of the reactants will be equal to the total mass of the products.
Magnesium is a second group element and is a metal. Metal reacts with hydrogen halides to form metal halides and hydrogen gas as the reaction written below:
[tex]Mg +2 HCl \rightarrow MgCl_{2} +H_{2}[/tex]
The evolved hydrogen gas in this reaction tries to diffuses out the sealing and thus the balloon cover expands. And thus the solid magnesium metal disappears to form magnesium chloride.
The evolution of gases is exothermic and therefore, the temperature outside increases suddenly. There we can see bubbles of hydrogen in the reaction system.
Therefore, the changes that occur in the experiments are, rapid evolution of gases, solid metal disappears, sealing cover expands and there occur a rapid change in temperature. Thus options A,C,D,E are correct.
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write the line formular,condensed formular and structural formular of 3-ethyl-1,2-dimethylheptane
This formula is wrong because a substituent can't attach with 1st carbon in chain or the here the no. of carbon in carbon chain is 8
What are the number of atoms in gallium
Answer: 31! hope this helps!
Explanation:
2Na(s) + Cl2(g) → 2NaCl(s)
Which of the following choices shows the correct Lewis electron-dot diagram for a molecule of chlorine, Cl2?
Answer: 2!
Explanation:
The best lewis structure for [tex]Cl_2[/tex] is in option 2.
Na or sodium is the cation in the reactant.
Cl or chlorine is the anion in the reactant side.
NaCl is the product of the reaction.
Lewis Structure is a very simplified representation of the valence shell electrons in a molecule. It is used to show how the electrons are arranged around individual atoms in a molecule. Electrons are shown as "dots" or for bonding electrons as a line between the two atoms.
Chlorine is a group VIIA element in the periodic table and contains seven electrons in its last shell.
Valence electrons are given by chlorine atoms = [tex]7\times2=14[/tex]
Total valence electrons = 14
So, each of Cl is surrounded by three pairs of dots, connected by a single line. So, the best lewis structure for [tex]Cl_2[/tex] is in option 2.
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Explain why laboratory safety rules are important.
it's for a essay please help!!!!!!
Answer:
Laboratory safety rules are important because there can be many dangerous chemicals in a lab. Safety rules help people stay safe when they are in close contact with these chemicals. Over the past few years, lab safety rules have prevented many deaths. It's important to follow these rules because you could get seriously injured if you don't.
Hope that helps! Good luck! :)
1 How does a hydroelectric plant work to produce electricity? List the steps below.
2 How is the way that a wind turbine works similar to the way that a hydroelectric
plant works? How is it different?
Answer:
1. -Hydropower plants capture the energy of falling water to generate electricity
-a turbine converts the kinetic energy of falling water into mechanical energy.
- a generator converts the mechanical energy from the turbine into electrical energy.
2. In the case of a wind-electric turbine, the turbine blades are designed to capture the kinetic energy in wind. The rest is nearly identical to a hydroelectric setup: When the turbine blades capture wind energy and start moving, they spin a shaft that leads from the hub of the rotor to a generator.
Explanation:
hope this kinda helped.
Which is the last element in the periodic table?
Answer:
Oganesson!
It is a synthetic chemical element with the symbol Og and atomic number 118. It was first synthesized in 2002 at the Joint Institute for Nuclear Research in Dubna, near Moscow, Russia, by a joint team of Russian and American scientists.
Answer:
the last element is ogasnesson
Suppose your friend investigated the color of
pea pods and concluded that green pods (G) were
dominant over yellow pods (g). What experimental
evidence would be needed to support this
conclusion?
Help pls!!
Answer:
Wag kang tatalon Kasi malayu ang talunan mo
The value of resistance r was determined by measuring current I flowing through the resistance with an error
Correct question is;
Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is?
Answer:
6%
Explanation:
From ohms law, we know that;
R = V/I
Where;
R is resistance
V is voltage
I is current
Now, the percentage error in the resistance is given by the formula;
ΔR/R = ΔV/V+ ΔI/I
We are told that the current and the voltage difference have a percentage error of 3% each. Thus;
ΔR/R = 3% + 3% = 6%
How many moles are in 15.62g of P?
Answer:
[tex]\boxed {\boxed {\sf 0.5043 \ mol \ P}}[/tex]
Explanation:
To convert from moles to grams, we must use the molar mass. This is found on the Periodic Table. Look for Phosphorous or P.
Phosphorus (P): 30.973762 g/molWe can use this number as a ratio.
[tex]\frac{30.973762 \ g \ P }{1 \ mol \ P}[/tex]
Multiply by the given number of grams: 15.62
[tex]15.62 \ g \ P *\frac{30.973762 \ g \ P }{1 \ mol \ P}[/tex]
Flip the fraction so the grams of phosphorus cancel.
[tex]15.62 \ g \ P *\frac{1 \ mol \ P}{30.973762 \ g \ P }[/tex]
[tex]15.62 *\frac{1 \ mol \ P}{30.973762 }[/tex]
[tex]\frac{15.62 \ mol \ P}{30.973762 }[/tex]
Divide.
[tex]0.504297799 \ mol \ P[/tex]
The original measurement of grams has 4 significant figures, so our answer must have the same.
For the number we calculated, that is the ten thousandth place. The 9 in the hundredth thousandth place tells us to round the 2 to a 3.
[tex]0.5043 \ mol \ P[/tex]
There are 0.5043 moles of phosphorus in 15.62 grams.
which alkene will most likely have the highest boiling point
a. ethene
b. hexane
c. pentene
d. propyne
Answer:
B. hexane
Explanation:
Im not sure I just goggled it
Answer:
A. Ethene
Explanation:
Ethene, propene and the various butenes are gases at room temperature. All the rest that you are likely to come across are liquids. Boiling points of alkenes depends on more molecular mass (chain length). The more intermolecular mass is added, the higher the boiling point
Name the technique used to separate oil from water and also the principle involved in the separation.
The technique used to separate oil from water is known as decantation.
Oil has less density compared to that of water.
By the process of decantation we can separate mixtures by removing a liquid layer that is free of a precipitate.
An atom that has lost one or more electrons is a(n) _____.
Not Cation
Answer:
ion
Explanation:
that is the definition according to g o o g l e:
"an atom or molecule with a net electric charge due to the loss or gain of one or more electrons."
Answer:
An ION
Explanation:
Because a positive ion is called a CATION and a negative ion is called an ANION (Please brainlist me)
Antarctica is a frozen land so cold and I see no changes in Wheeler scientist have discovered fossils
Answer:
The correct answer is - due to the movement of plates it is relocated.
Explanation:
Antarctica is a very cold part of the earth, it is so cold that there is no growth of trees or such vegetation. Even though there are no or less vegetation scientists found fossils of the trees.
It is relocated from the north where the conditions were warmer and easy for tree growth. It is then moved due to plate movements to the south pole. This is the reason behind the fossils scientist found.
How does the concentration of ions in a strong base differ from a weak base?
1 full sentence answer. TY!
Answer:
Strong acids ionize completely in aqueous solutions while weak acids release a few ions in aqueous solutions.
How many atoms are in 4.25 g of Ag?
Group of answer choices
2.76 x 10^26 atoms
2.37 x 10^23 atoms
2.76 x 10^23 atoms
2.37 x 10^22 atoms
what is the name of the atom with 16 protons, 15 neutrons and 18 electrons
hey y’all, I’m growing a plant for science class but I need some questions about the plant, can someone please give me atleast 3 questions to answer for it..
Hurry pls <3
Answer:
What four things do all plants need?
What are the parts of the plant?
What does the root do for the plant?
What does the stem do for the plant?
What do leaves do for the plant?
The plant parts that take in water and minerals from the soil are?
What is the first stage in the growth of many plants?
Explanation:
:)
A temperature of 37C is equivalent to a temperature of
Answer:
98.6 Degrees Fahrenheit
Explanation:
To convert from Celsius to Fahrenheit, the formula is F=(1.8*C)+32. Since C=37 in this case, our formula is F=(1.8*37)+32. First, solving the work in the parentheses, 1.8*37=66.6. Adding that will get you to 98.6, so F=98.6.
