Answer:
Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
Explanation:
Answer:
Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles
use the law of conservation of mass to complete this reaction. Na+Cl2
Answer:
sulfur, selenium, and oxygen.
Explanation:
I got it right on my test
11. The respiration rate of a goldfish is
measured. The goldfish is then placed in
cold water and the respiration rate is
measured again.
Answer:
the respiration rate is the independent varaible ,measured is the indpendent variable i think
Explanation:
The substances are placed in separate containers at room temperature, and each container is gradually cooled. Which of these substances will solidify before the temperature reaches 0°C?
Answer:
Benzene
Explanation:
it's freezing point is 5.5 C which is greater than 0 C
3. SE7.12D The cell organelle responsible for providing energy for cell processes in plant
and animal cells is the -
3. Why do you think it is important that an erosion control blanket
break down after a few weeks or months?
Answer:
The primary purpose of erosion control blankets is to keep soil from shifting or moving. They help stabilize soil particles and sediments, holding them in place to prevent sliding due to water, wind or other natural causes.
Explanation:
A coyote and an oak tree both have DNA?
Answer:
true, they both have different types of DNA.
Answer:
Um yes... they have different DNA's.. ;-;
Explanation:
a 20.0g sample of an element contains 2.16x10^23 atoms identify the element
Answer:
yes
Explanation:
1. 30 kg =___g
Idk how to do this pls help
Answer:
30000
Explanation:
all you have to do is multiply by 1000
2. Magnesium is an alkaline earth metal. With which group of elements is magnesium most reactive?
F. nonmetals
G. noble gases
H. alkali metals
J. transition metals
Answer:
alkali metals
Explanation:
alkali metals
The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature. These metals have only one electron in their outer shell. Therefore, they are ready to lose that one electron in ionic bonding with other elements.
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How is this model useful?
O It shows how electrons are distributed in the shells of an iron atom.
O It shows how electrons are distributed in the shells of a cobalt atom.
o It shows how orbitals are distributed in the shells of an iron atom.
It shows how orbitals are distributed in the shells of a cobalt atom.
Answer:
A) It shows how electrons are distributed in the Shells of an Iron atom.
Explanation: Took the test on Edge
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option A.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The given model shows how electrons are distributed in the shells of an iron atom.
Therefore, the correct option is option A.
To know more about atom, here:
https://brainly.com/question/13518322
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Given a thin sheet of tin foil as shown below, determine the thickness of the foil if the mass is 1.68 g and the density of tin is 7.31 g/cm^3. Show all of your work. Round your final answer to two digits and don't forget units. (4 points) *PLEASE HURRY*
Given :
Mass of foil , m = 1.68 g .
Density of foil , [tex]\rho=7.31\ g/cm^3[/tex] .
To Find :
The thickness of the foil .
Solution :
Let , length and breadth is l and b respectively .
Also , height be h .
Volume is given by :
[tex]V=l\times b\times h[/tex]
Density is given by :
[tex]\rho=\dfrac{m}{V}\\\\V=\dfrac{m}{\rho}\\\\l\times b\times h=\dfrac{1.68}{7.31}\\\\l\times b\times h=0.23\\\\h=\dfrac{0.23}{lb}[/tex]
Therefore , thickness of the foil is [tex]\dfrac{0.23}{lb}[/tex] .
Hence , this is the required solution .
Identify whether each element is a halogen, a noble gas, or nonmetal only.
Astatine (At):
Nitrogen (N):
Krypton (Kr):
Chlorine (Cl):
Sulfur (S):
Answer:
(At)halogen
(N)nonmetal only
(Kr)Nobel gas
(CI)halogen
(S)nonmetal only
Explanation:
Answer:
(At): Halogen
(N): Nonmetal only
(Kr): Noble Gas
(Cl): Halogen
(S): Nonmetal only
Explanation:
Took the test on edge!
Sorry if its wrong but it shouldnt be.
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20. Convert: 7.7 mm
km.
a. 7.7 x 10-6
b.7.7 x 10-3
c. 7.7 x 103
d. 7.7 x 106
e. 7.7 x 102
Which element is in Group 17 and has more than 50 protons but less than 75 protons?
Answer:
Iodine
Explanation:
Iodine is in group 17 on the periodic table (first picture attached). The second picture shows you in the top left-hand corner of Iodine's little square, there is the number 53. This is the atomic number, it is also the number of protons and electrons in an element.
Hope this helped :)
You are inviting 32 friends, you estimate that each friead will eat 2.5 slices of pizza, on average, each pizza contains 8 slices, and there is a deal where you can buy 2 pizzas for $15
Answer:
$75
Explanation:
32(2.5) = 80 slices
80 slices / 8 slices = 10 pizzas
10/2 = 5 two pizza deals
5 x 15 = $75
Laboratory equipment is cleaned and properly stored after use primarily so that
chemical products can be measured and recorded as data
time is saved in setting up the next experiment
toxic materials can be kept in the laboratory
the possibility of contamination in the laboratory is minimized
Answer:
The last option is the correct option
Explanation:
Laboratory equipment and work benches are cleaned (and stored properly in the case of equipment) after use so as to keep them free of the purpose it has been used for, which if not done, could lead to various undesirable events/aftermath. For example, if dyes or grease is used in a process in the laboratory, these compounds need to be washed off the glasswares (like measuring cylinder) it was poured in during the course of the experiment to prevent the glassware from retaining some of it's residual particles hence contaminating the glassware for future laboratory use. Cleaning must be done on the surfaces the experiment was carried out also for the same reason.
Hence, the correct option is the possibility of contamination in the laboratory is minimized.
1. How many miles are in 1,000,000 centimeters?
Answer:
6 miles.
Explanation:
There is a lot of decimal points after it. But you just need to convert everything. But if you round it to the nearest whole, it would be 6 miles.
Answer:
Ex1,000,000 Centimeters =
6.2137119 Miles
planation:
According to Dalton’s atomic theory, atoms:
A.are destroyed in chemical reactions.
B.can be divided.
C.of each element are identical in size, mass, and other properties.
D.of different elements cannot combine
Answer:
C
Explanation:
Dalton's atomic theory are: Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass.
Dalton's atomic theory opines that atoms of the same element are identical in size, mass, and other properties and are different from atoms of other elements.
In addition, Dalton theorized that atoms can neither be created nor destroyed, and they are the smallest indivisible particle of elements.
He also proposed that atoms of different elements are also able to combine in whole number ratio to form compounds.
More on Dalton's atomic theory can be found here: https://brainly.com/question/13157325?referrer=searchResults
0.000786 written in scientific notation is?
which heat source would keep the pizza the warmest.
Answer:
a lot of heat source
Explanation:
Calculate the following using the correct significant digits: 3.10 x 4.520
Answer:
6
Explanation:
2+2=6
Answer:
3.10 × 4.520 = 14.0
Explanation:
Sig Figs
3
Decimals
1
Scientific Notation
1.40 × 10'
Can someone help me please!! Apex
What does the mass number represent?
A. The average charge of all ions of the element
B. The sum of the masses of all the isotopes
C. The sum of the atomic numbers of all the isotopes
D. The average mass of all isotopes of the element
Answer:
It is D
Explanation:
last brainliest
1.) How do plants get their energy?
Answer:
Sun, water, caron dioxide.
Explanation:
They get there energy from those because photosynthesis the sun gives them that energy but the sun goes with water too because the sun and the water help it eat and produce its food and then the carbon is for it to breathe and thats how we have oxygen because the plants take in carbon and then they give out oxygen so thats why we need plants and plants need us.
Can i be brainliest.
If there are three naturally occurring isotopes of the hypothetical element R. The R-64 isotope has a 48.89% abundance and mass of 63.929 amu. The R-65 isotope has a 27.81% abundance and mass of 65.996 amu. The R-67 isotope has a 23.30% abundance and mass of 67.002 amu. Calculate the average atomic mass of the hypothetical element R.
Answer:
65.21g
Explanation:
[tex](48.89 \div 100) \times 63.929 = 31.25 \\ (27.81 \div 100) \times 65.996 = 18.35 \\ (23.3 \div 100) \times 67.002 = 15.61 \\ 31.25 + 18.35 + 15.61 = 65.21[/tex]
When a cell duplicates itself and splits into 2 cells it is called mitosis.
Which statement about the cells is correct?
ANSWER CHOICES
A Group of answer choices
B There is no genetic information in the new cells.
C None of these answers are correct.
D The cells are demonstrating cell theory; cells come from pre-existing cells.
E The cells will be damaged and die
Answer:
The answer is D
What are intermolecular forces?
What is 9872002 in scientific notation?
Answer:
= 9.872002 × 10^6
Explanation:
Move the decimal point in your number until there is only one non-zero digit to the left of the decimal point. The resulting decimal number is a.
Count how many places you moved the decimal point. This number is b.
If you moved the decimal to the left b is positive.
If you moved the decimal to the right b is negative.
If you did not need to move the decimal b = 0.
Write your scientific notation number as a x 10^b and read it as "a times 10 to the power of b."
Remove trailing 0's only if they were originally to the left of the decimal point.
Can an element be a compound? Explain?
Answer:
Yes
Explanation:
A compound is a pure substance composed of two or more different atoms chemically bonded to one another. A compound can be destroyed by chemical means. It might be broken down into simpler compounds, into its elements or a combination of the two.
Material of density of 762 kg/m3 occupies a container
volume of 99 cm3. What is its mass?
Hint: density = mass/volume
Answer:
The answer is
0.075 kgExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density = 762 kg/m³
We must first convert the volume from cm³ to m³
[tex]1 \: {cm}^{3} = 1 \times {10}^{ - 6} {m}^{3} [/tex]
So 99 cm³ will be
[tex]9.9 \times {10 }^{ - 5} \: \: {m}^{3} [/tex]
So the mass of the material is
[tex]mass = 762 \times 9.9 \times {10}^{ - 5} \\ = 0.075438[/tex]
We have the final answer as
0.075 kgHope this helps you
Answer:
75438 kg
Explanation:
name physical properties
Answer:
Some examples of physical properties are:
color (intensive)
density (intensive)
volume (extensive)
mass (extensive)
boiling point (intensive): the temperature at which a substance boils.
melting point (intensive): the temperature at which a substance melts.
Explanation:
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