Answers
Answer:
it is number 2
Explanation:
hope this helps it is number 11
Related Questions
how do i caculate velocity
Answers
Answer:
Velocity Equation in these calculations:
Final velocity (v) of an object equals initial velocity (u) of that object plus acceleration (a) of the object times the elapsed time (t) from u to v.
Explanation:
SOMEONE HELP ME PLEASE ILL GIVE BRAINLY
Answers
(b) A atom T has atomic number 11 and mass number 23. How many (I) protons does it have?
Answers
Answer:
There are 11 protons in an atom T.
Explanation:
In chemistry, the scientific word for proton is also known as atomic number so the proton number will be 11.
Answer:
11
Explanation:
Can someone please help me with this?-- 20 pts!
Oxygen has six valence electrons, and an electronegativity of 3.44. Calcium has two valence electrons and an electronegativity of 1.00.
How can the octet rule be used to explain the bonding between them?
Oxygen needs access to two electrons to reach a full octet. Each calcium atom has two valence electrons that it prefers to lose to obtain a full octet. Therefore, one oxygen atom and one calcium atom complement each other and form an ionic bond.
Oxygen needs access to two electrons to reach a full octet. Each calcium atom has two valence electrons that it prefers to lose to obtain a full octet. Therefore, one oxygen atom and one calcium atom complement each other and form a covalent bond.
Oxygen needs to lose six electrons to reach a full octet. Each calcium atom needs access to six electrons to achieve a full octet. One oxygen atom donates all its electrons to calcium, forming an ionic bond.
Oxygen needs to lose six electrons to reach a full octet. Each calcium atom needs access to six electrons to achieve a full octet. One oxygen atom donates all its electrons to calcium, forming a covalent bond.
Answers
Answer:
Oxygen needs access to two electrons to reach a full octet. Each calcium atom has two valence electrons that it prefers to lose to obtain a full octet. Therefore, one oxygen atom and one calcium atom complement each other and form an ionic bond.
Explanation:
The bond between oxygen and calcium must be ionic given the fact that the electronegativity difference between them is about 2.44.
Calcium prefers to loose two electrons while oxygen receives these two electrons hence the both atoms attain the octet structure.
Recall that an ionic bond is formed by the loss and gain of electrons by two bonding atoms (complete transfer of electrons). Thus the bond between each calcium and oxygen atom is ionic.
What type of conspiracy did Apple take part in?
Answers
There is sufficient evidence to show that Apple violated Section 1 of Sherman Act by making publishers raise price of e-books.
Explanation:
What is the best definition of biology?
A. The study of energy and light
B. The study of matter
C. The study of applied science
D. The study of living things
Answers
Answer:
D. The study of living things
Explanation:
prefix "bio-" means life, living things
The scientist philosopher Aristotle is known as the father of biology. The best definition of biology is the study of living things. The correct option is D.
What is biology?The branch of science which deals with the study of living organisms, their origins, anatomy, morphology, and distribution is known as the biology. Biology is a natural science discipline which studies living things.
The study of living things and their important processes is explained in biology. This field deals with all the physiochemical aspects of life. It is sub divided into other branches like botany, physiology and zoology.
Thus the correct option is D.
To know more about biology, visit;
https://brainly.com/question/14596078
#SPJ2
I WILL GIVE BRANLIEST What factor is the temperature in an ecosystem? Abiotic or Biotic?
Answers
“ temperature is an abiotic factor with an ecosystem abiotic factors are the parts of an ecosystem that are nonliving such as weather and temperature”
Answer:abiotic .
Explanation:
When a 0.4500 g sample of impure potassium chloride was dissolved in water and treated with an excess ofsilver nitrate, 0.8402 g of silver chloride was precipitated. Calculate the percentage KCl in the original sample.
Answers
Answer:
97.78% KCl in the original sample
Explanation:
The % of KCl in the original sample would be as follows:
[tex]97.78[/tex]%
Given that,
Amount of sample of impure Potassium Chloride [tex]= 0.4500 g[/tex]
Amount of Silver Nitrate precipitated [tex]= 0.8402g[/tex]
Now,
Molarity of KCl = [tex]74.5 g/mol[/tex]
Minimum moles required for reaction [tex]= 0.0059 mol[/tex]
Final number of moles [tex]= 0.0059 mol[/tex]
So,
Concentration = Number of moles * Molarity
[tex]= 0.0059 mol * 0.74.5 g/mol\\= 0.440g[/tex]
Therefore,
% of KCl in the original Sample = Weight of Pure KCl/Weight of Impure KCl
[tex]= 0.440/0.450[/tex] × [tex]100[/tex]
[tex]= 97.78[/tex]%
Thus, [tex]97.78[/tex]% is the correct answer.
Learn more about "Potassium Chloride" here:
brainly.com/question/19613085
1. Why is soil erosion relatively less in dense forests as compared to barren, open fields?
Answers
Because the deep roots of big trees hold the soil and don't let it slip away simply by rain or wind.
Answer:
the roots of the trees keep the soil in place opposed to a barren landscape that has little to no plants to keep the soil in place
hope this helps (╹ڡ╹ )
What will happen to the flow of blood in blood vessels (pulse) if heart beat rate increase
Answers
Answer:
"Low levels of the hormone epinephrine, also called adrenaline, cause blood vessels to relax and widen. High levels of this same hormone, along with the hormone norepinephrine, cause the blood vessels to narrow and the heart rate to rise, increasing blood pressure."
Explanation:
What color are the stars on the diagram with the lowest surface temperatures?
Answers
Answer:
red supergiants is the answer
Please HELP ME please it would be amazing if you can!!
Answers
Answer:
i think 4
Explanation:
Answer:
i guess number 4
Explanation:
What else is produced during the combustion of butane, C4H10?
2C4H10 + 13O2 8________ + 10H2O
Answers
Answer:
CO2
Explanation:
A brick has a volume of 475 cubic centimeters and a mass of 912 grams. Calculate its
density.
Write your answer to the hundredths place
Answers
Answer:
1.92 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{912}{475} \\ [/tex]
We have the final answer as
1.92 g/cm³Hope this helps you
How many moles are equal to 145 g of sodium carbonate?
Answers
Answer:
There are
0.0642 mol Na
2
CO
3
in
6.80 g
.
Explanation:
The chemical formula of sodium carbonate is
Na
2
CO
3
. The molar mass of sodium carbonate is
105.988439 g/mol
.
What is the total number of atoms in 0.20 mol of propanone, CH3COCH3?
NA = 6.022 x 1023
1.2 x 1022
1.2 x 1023
6.0 X 1024
6.0 x 1023
Answers
Answer:
1.2×10²³ atoms.
Explanation:
Data obtained from the question include:
Mole of propanone = 0.20 mole
Number of atoms of propanone =.?
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.022×10²³ atoms.
This implies that 1 mole of propanone also contains 6.022×10²³ atoms.
Thus, we can obtain the number of atoms in 0.20 mole of propanone as illustrated below:
1 mole of propanone contains 6.022×10²³ atoms.
Therefore, 0.20 mole of propanone will contain = 0.2 × 6.022×10²³ = 1.2×10²³ atoms.
Thus, 0.20 mole of propanone contain
1.2×10²³ atoms.
The total number of atoms in 0.20 mole of propanone is 1.2×10²³, i.e. in given mole 1.2×10²³ atoms of propanone is present.
How many atoms present in one mole?In one mole of any substance 6.022 × 10²³ atoms of that substance will present, and this number is known by the name of Avogadro's number.
We have given moles of propanone = 0.20 mole
No. of atoms present in 0.20 mole of propanone = 0.20 × 6.022×10²³ = 1.2×10²³.
Hence, 1.2×10²³ atoms are present in given moles.
To know more about Avogadro's number, visit the below link:
https://brainly.com/question/10614569
The rate of a chemical reaction would be decreased by
Answers
Answer:
The tempreature???
Explanation:
Colder tempreatures lead to a slower chemical reaction and warmer tempreatures lead to a faster chemical reaction.
A cylinder fitted with a piston has 10 dm3
of a gas 27ºC. How can you double the pressure
by varying the temperature only?
Answers
Answer:
go to the website quizlet it will help you!!!!!!!!
Explanation:
Which of the following best describes a vacuum?
Hot
Cold
Shiny
Empty
Answers
Answer:
hot
Explanation:
Answer:
The Answer is (Empty)
Jorge conducted an experiment, and included the graph shown below as part of his lab report.
TEMPERATURE CHANGES DURING
CHANGES OF STATE OF WATER
140
120
9 100
Temperature (C)
80
60
20
--20
0
20
80
100
Jorge's experiment involved which of the following?
A chemical change.
The formation of a new substance.
A change in the chemical properties of a substance.
A physical change.
Answers
Answer:physical change
Explanation:
Which of the following equations is not balanced?
Answers
Explanation:
i think the answer is first and last
last one is balanced!!
Give a scenario in which a good conductor would come in handy.
Answers
Explanation:
Not sure if ment like an electric type that gives off energy but here is my answer. a good conductor comes off handy in every situation. meaning, without one a machine, or whatever the conductor is being used for could be unstable, or not be able to work perfectly. which would could lead to certain malfunctions. so a good conductor could also give you a better chance of succeeding.
How do I graph these question
a. Explain why bicycle tires seem higher in the summer than in winter.
b. Explain why a can of soda pop explodes if left in the hot sun.
c. A rigid container filled with a gas is placed in ice (ex. nalgene bottle). What will happen to the pressure of the gas? What do you think will happen to the volume?
d. An infected tooth forms an abscess* that fills with gas. The abscess puts pressure on the nerve of the tooth, causing a toothache. While waiting to see a dentist, the person with the toothache tried to relieve the pain by treating the infected area with moist heat. Will this treatment help? Why or why not?
Answers
Heat and temperature are related, but they are not the same thing. Heat is a form of
energy called thermal energy. Objects are composed of molecules, which move around.
When molecules gain energy, they move even more. Every object on Earth has thermal
energy. That's because even the molecules inside very cold objects are not perfectly still,
Temperature is a measure of the intensity of an object's thermal energy. It tells us the
average amount of thermal energy an object has. This is why a small hot object can have a
higher temperature but less thermal energy than a large cold object.
Based on the passage, an object with a lot of thermal energy
А
might be cold but very small
B
might be cold but very large.
is always large
is always small.
Answers
To quote the passage: "...a small hot object can have a
higher temperature but less thermal energy than a large cold object."
In other words, a small object can have a high average thermal energy, and therefore a high temperature, but since the object is smaller, the magnitude of thermal energy present in the object is by default less than that in the larger object. As the passage indicates, every object has thermal energy. So, despite the fact that the larger object is colder, it still has a greater thermal energy due to the number of molecules that comprise the larger object.
Answer:Based on the passage, an object with a lot of thermal energy might be cold but very large.
6. All changes in states of matter (freezing, evaporation, condensation, etc.) are
a. physical changes
b. chemical changes
Answers
Pretty sure its Physical Changes
No chemical reaction is happening.
Answer:
Changes of states are physical changes
Explanation:
They are reversible changes that do not involve changes in matter's chemical makeup or chemical properties.
PLEASE MARK BRAINLIEST
Right Now Please <_> I really need it to level up
What is the difference between carbon-12, carbon-13, and carbon-14?
Answers
Answer:
Number of neutrons in the nucleus.
Explanation:
Mass number is protons plus neutrons. Protons do not change from isotope to isotope
I WILL GIVE YOU BRAINLIEST HELP HELP HELP THE SUBJECT IS ACTUALLY SCIENCE What factor is deer in an ecosystem? Abiotic or Biotic? the subject is actually science
Answers
Answer: the answer is biotic because dear are a living factor
Explanation:
5)
Experiments with gold foil indicated that atoms
A)
usually have a uniform distribution of positive charges
B)
usually have a uniform distribution of negative charges
C)
contain a positively charged, dense center
D)
contain a negatively charged, dense center
Answers
Answer:
c
Explanation:
I just learned all this in chemistry too lol
got 100 on the test last week so its good
Experiments with gold foil indicated that atoms contain a positively charged, dense center and the correct option is option C.
Experiments with gold foil, known as the Rutherford gold foil experiment, were conducted by Ernest Rutherford in 1911. In this experiment, he bombarded a thin gold foil with alpha particles.
Most of the alpha particles passed through the foil with little deflection, but some of them were deflected at large angles, and a small fraction even bounced back. This observation led Rutherford to conclude that the atom contains a positively charged, dense center called the nucleus, where most of its mass is concentrated. He proposed the nuclear model of the atom, which became a significant advancement in the understanding of atomic structure.
Thus, the ideal selection is option C.
Learn more about Gold foil experiment, here:
https://brainly.com/question/33537458
#SPJ6
Knowledge of the functioning of cells and DNA has led to the creation of new life in laboratories. What is an example of an ethical question this raises?
a) Why are cells and DNA important to study?
b) How do cells create new life?
c) How many cells do humans have?
Is it wrong to change or control life forms?
Answers
Answer:
Explanation:
It’s D
Answer:
D. Is it wrong to change or control life forms?
Explanation:
edge 2021 :P
if the atomic mass is 14 and the atomic number is 7,how many neutrons do you have?
Answers
Answer: 7 neutrons
Explanation: Atomic number refers to the number of protons in the nucleus of the atom. Also you can treat atomic mass as how many particles (protons and neutrons) are in the nucleus of the atom. So for this problem:
14 particles - 7 protons = 7 neutrons (and we know all that's left over is neutrons because we subtracted all the protons)