Answer:
18 electrons
Explanation:
Answer:
18 electrons
Explanation:
Ca has 20 electrons. Ca^2+ has 18 electrons
which statement correctly describes a characteristic that a scientific measuring toll should have?
Answer:
Explanation:
To be accurate, it must be able to make measurements that are close to the actual value.
Answer:
Answer: To be accurate, it must be able to make measurements that are close to the actual value.
Explanation:
Which mineral is found in almost every type of rock?
Answer:
Olivine
Explanation:
Hope this helps! :) x
If you dissolve 5.00 kg of methanol (CH_4O) in 2.00 m^3 of water, how many molecules of methanol per liter of water do you have? (1 kg = 1000 g; 1 m^3 = 1000 L)
Given :
Mass of methanol ( [tex]CH_3OH[/tex] ) , m = 5 kg = 5000 g .
Volume of water , [tex]V=2\ m^3=2000\ L[/tex] .
To Find :
Molecules of methanol per liter of water .
Solution :
Moles of methanol , [tex]n=\dfrac{5000}{32}=156.25\ mol[/tex] .
We know , 1 mole of a substance contains [tex]6.022\times 10^{23}\ mol^{-1}[/tex] .
So , total number of molecules :
[tex]M=156.25\times 6.022\times 10^{23}\\\\M=9.41\times 10^{25}[/tex]
Number of molecules per liter :
[tex]\dfrac{9.41\times 10^{25}}{2000}\\\\4.705\times 10^{22}[/tex]
Hence , this is the required solution .
How can the motion of an object that is NOT moving change?
Answer:
Inertia.
Explanation:
The resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed, when no forces act upon them.
We have that for the Question "How can the motion of an object that is NOT moving change?" it can be said that Force is the reason for motion and is how can the motion of an object that is NOT moving change
Force
From the question we are told
How can the motion of an object that is NOT moving change?
Generally
Motion defines as the movement of a body from one place to another
Therefore
What the question is asking is
What makes the movement occur
Force
Force is defines as Mass of of an object times its acceleration but aslo is
the work done in a given time frame
Therefore
Force is the reason for motion and is how can the motion of an object that is NOT moving change
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Element X has 3 naturally occurring isotopes. The first isotope has an atomic mass of 28.0 amu and a natural abundance of 14.0%. The second isotope has an atomic mass of 29.0 amu and a natural abundance of 66.0%. The third isotope has an atomic mass of 27.4 amu and a natural abundance of 20.0%. What is the atomic mass of element X?
a-27.1 amu
b-28.5 amu
c-28.9 amu
d-29.1 amu
Answer:
Option B. 28.5 amu
Explanation:
The following data were obtained from the question:
Isotope A:
Mass of A = 28.0 amu
Abundance (A%) = 14.0%
Isotope B:
Mass of B = 29.0 amu
Abundance (B%) = 66.0%
Isotope C:
Mass of C = 27.4 amu
Abundance (C%) = 20.0%
Atomic mass of element X =.?
The atomic mass of element X can be obtained by using the following formula:
Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]
Atomic mass of Element X = [(28 × 14)/100] + [(29 × 66)/100] + [(27.4 × 20)/100]
= 3.92 + 19.14 + 5.48
= 28.54 ≈ 28.5 amu
Therefore, the atomic mass of Element X is 28.5 amu
What is the mass of 42.0 mL of a liquid with a density of 1.65 g/mL?
Answer:
The answer is
69.30 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 42 mL
density = 1.65 g/mL
The mass is
mass = 1.65 × 42
We have the final answer as
69.3 gHope this helps you
5. An object is a regular, rectangular, solid with dimensions of 2 cm by 3cm by 2cm. It has a mass of 24 g. find its density.
Answer:
Density, D = 2g/cm^3
Explanation:
Given the following data;
Length = 2cm
Width = 3cm
Height = 2cm
Mass = 24g
Density = ?
Volume of a rectangular solid (V) = Length × Weight × Height
Therefore, V = L× W × H
Substituting the values, we have;
[tex]V = 2 *3 * 2 = 12[/tex]
V = 12cm
Density can be defined as the ratio of mass to volume i.e mass all over volume.
Mathematically, [tex]Density = \frac{Mass}{Volume}[/tex]
[tex]D = \frac{M}{V}[/tex]
Substituting the values, we have;
[tex]D = \frac{24}{12}[/tex]
Density, D = 2g/cm^3
Hence, the density of the rectangular solid is 2g/cm^3.
Which of the following is a producer? O mouse cactus O snake O goose
Answer:
cactus
Explanation:
Its a plant so it makes it own food
Why is being under the band of stability a problem?
Answer:
Because that indicates that something is not stable. (im pretty sure that's the reason. Im not fully sure. Good question!)
Explanation:
What is another common name for the lanthanoids on the periodic table?
Scientists are studying cell-to-cell communication in a human spleen.
How would scientists most likely use technology during this study?
to draw a diagram showing how cellular communication occurs
to predict what triggers cells-to-cell communication
to determine safety procedures to be used in the laboratory
to determine the number of visible cells by counting them
Answer:
To predict what triggers cell-to-cell communication
Explanation:
Methodologies used for studying cell-to-cell communication includes
1) The reductionist method in which cellular response are measured based on testing specific cellular signals by the introduction of different chemicals, so as to find the source that triggers the response
2) By the application of known chemical reagents enable or block specific areas of an organism's receptors and with the aid of an electrode measure the cellular response based on generated currents of ions or by collecting and analyzing fluid samples from the affected area.
Answer:
b
Explanation:
just took test
11. An object accelerates 7.2 m/s?when a force of 4.0 newtons is applied to
it.
What is the mass of the object?
Answer:
0.56 kg
Explanation:
F = ma. Force = Mass x acceleration
Let's take a look at why that works. If something has more mass ie atoms then it will require more effort to move it. If you want make something speed up at a higher rate then again you need to provide more of an effort. Therefore you need more force for both these situations.
Therefore the equation works.
HELP!!! Please answer.
Answer:
Magnesium dichloride
Explanation:
In which state do the particles have the most energy?
Answer:
gas
Explanation:
How are compound, elements, and mixure different
Explanation:
Compound: a substance that is made up of more than 1 type of atom bonded together Example: H2O
Mixture: combination of two or more elements or compounds not chemicaly bonded together. example: Sugar and salt in one container
elements pure substance of an atom. Example: hydrogen