Answer:
They repel due to a force of repulsion
C: Ms. Bakare has two bottles of sulfuric acid, X and Y. There is one litre of acid in each bottle.
The acid in bottle X is concentrated.
The acid in bottle Y is dilute.
Predict one difference in the properties of the acids in bottles X and Y.
a.
Acid of x bottle is highly reactive because solute is more and acid of y bottle is less reactive because solvent is more.
Which statement best describes how an ionic bond forms?
The transfer of electrons forms strong bonds between ions.
The sharing of electrons forms strong bonds between ions.
The transfer of electrons results in repulsive forces between molecules.
The sharing of electrons results in attractive forces between molecules.
The transfer of electrons forms strong bonds between ions is the best
statement that describes ionic bond formation.
Ionic bond is also known as electrovalent bonding. It involves the transfer
of electrons from an element to another. This is done so as to enable the
elements achieve a stable configuration and formation of new compounds.
The ionic bonds formed are usually strong so as to prevent the elements
from losing their stable configuration.
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Is oxygen a polar molecule or a nonpolar molecule?
Explain your reasoning.
Answer:
Oxygen is a nonpolar molecule.
Explanation:
It is symmetric, because two oxygen atoms pull on the electrons equally. Propane is also nonpolar.
Acid contains. a) h^+. b)oh^-
Answer:
hydrogen ions which is H+
Answer: An acid is a solution with more H+ ions than OH- ions. An acid is any compound that yields hydrogen ions (H+) or hydronium ions (H3O+) when dissolved in water.
Explanation:
The dimensions of a rectangular solid are measured to be 1.27 cm, 1.3 cm, and 2.5 cm. The volume should be recorded as
a
4.1 cm^3.
b
4.13 cm^3.
c
4.12 cm^3.
d
4.128 cm^3.
Answer: 4.1 cm3
Explanation:
We have that for the Question "The dimensions of a rectangular solid are measured to be 1.27 cm, 1.3 cm, and 2.5 cm. The volume should be recorded as" it can be said that The volume is
V=4.128 cm^3.
Option D
From the question we are told
The dimensions of a rectangular solid are measured to be 1.27 cm, 1.3 cm, and 2.5 cm. The volume should be recorded as
a )4.1 cm^3.
b )4.13 cm^3.
c )4.12 cm^3.
d )4.128 cm^3.
Generally the equation for the Volume is mathematically given as
[tex]V=L*B*H\\\\Therefore\\\\V=1.27*1.3*2.5\\\\V=4.1275\\\\\V=4.128 cm^3.\\\\[/tex]
Hence The volume is
V=4.128 cm^3.
Option D
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How many moles of hydrogen are needed in 100g of water
200 g of just H
100 g of H2
10. Bases tend to taste
bitter
Answer:
yessir
Explanation:
Answer:
yxfuu do wiz so chic yucky e
Having energy in the reactant lead to an exothermic reaction.
true
false
Answer:
false
Explanation:
first of all;-energy lead to an indotermic reaction.
indotermic is a reaction that absorbs energy \
*it has positive enthalpy of reaction
*Heat content of product is greater than that of reactant
*Heat is added to reactant side
example;- CO^2+2H^2+891kj --------- CH4 +2O2
Calculate the density for a rectangular block using the following measurements: Length = 10 cm, Width = 1.1 cm, Height = 15 cm, Mass = 65.2 grams.
Question 3 options:
4.35 g/cm3
0.40 g/cm3
2.53 g/cm3
6.52 g/cm3
Answer:
0.40 g/cm3
Explanation:
density = mass / volume.
mass = 65.2 grams
volume = 10*1.1*15=165 cm3
so density = 65.2/165=0.40 g/cm3
To what temperature does a 250 mL cylinder containing 0.1 MOLHE need to be cooled in order for the pressure to be 253.2 5 K PA
we use the formula
pV=nRT
we convert Kilo Pascals to mmHg
253.25 KPa=253250 pascals
1mmHg is equal to 133.322 pascals
xmmHg are equal to 253250pascals
x=253250/133.322=1900mmHg
now we convert mmHg to atmospheres
1 atmosphere is equal to 760mmHg
x atmospheres are equatl to 1900mmHg
x=1900/760=2.5 atmospheres
in the formula:
pV=nRT
p-pressure
V-volume
n-number of moles
R-ideal constant of gases
T-temperature
the only missing variable is temperature since we know that R=0.082
250ml=0.25L
0.25*2.5=0.1*0.082T
T=0.625/0.0082=76.219K
geologists classify sedimentary rocks as either clastic chemical or organic
Answer:
both. yes
Explanation:
Which of the elements listed below has the smallest atomic radius? Sulfur O Chlorine Oxygen Fluorine
Answer:
F has the smallest atomic radius.
Explanation:
Atomic radius is one of the perIodic properties defined by the Periodic Table.
Atomich radius is the distance to the nucleus that comprises 95 % of the density electronic load. It can be defined as a function of the internuclear distance. Although this distance varies, depending on whether the atoms are linked by a chemical bond or simply in contact without forming link.
Atomic radius is a periodic property that increases by period (from the top to below) and decreases (from left to right) by group.
In the same group are O and F, so F < O
In the same group, we have S and Cl, so Cl < S
As Cl and F are in the same period, we define the atomic radius Cl > F and
S > Cl (In the same period)
The right way to order the elements are S > Cl > O > F
Answer:
Cadmium has larger atomic radius than sulfur.
Explanation:
Down a period, atomic radii decrease from left to right due to the increase in the number of protons and electrons across a period: when a proton is added the pull of the electrons towards the nucleus is larger, so the size of the atom decreases.
Hence, you can compare the elements that belong to a same period and predict that the atom with lower atomic number (number of protons) will haver larger atomic radius. With that:
Oxygen and fluorine are in the period 3, being oxygen to the left of fluorine, so oxygen is larger than fluorine.
Sulfur and chlorine are in the period 4, being sulfur to the left of chlorine, so sulfur is larger than chlorine.
Now see whan happens down a group. Atomic radius increases from top to bottom within a group due to electron shielding. That permits you to compare the size of the elements in a group:
Fluorine and chlorine are in the same group (17), with chlorine directly below fluorine, so the atomic radius of chlorine is larger than the atomic radius of fluorine.
Sulfur and oxygen are in the same group (16), with sulfur directlly below oxygen, so sulfur the atomic radius of sulfur is larger than the atocmi radius of oxygen.
So far, you can rank the atomic radius of sulfur, chlorine, fluorine, and oxygen, in increasing order as:
O < F < Cl < S, concluding that O, F, and Cl have smaller atomic radius than S.
Cadmiun, Cd, is to the left and below sulfur, so both electron shielding (down a group) and increase of the number of protons (down a period) lead to predict the cadmium has a larger atomic radius than sulfur.
FIND THE DENSITY OF REGULAR SHAPED SOLID
Mass: 1296.09
Answer:
I believe it is 9. mass divided by volume and to find volume multiply LxWxH
A soccer ball was kicked it had the mass of .42 kg and accelerated at 25m what is the force
Your mother gives you 250 mg of acetaminophen and a cup containing 500 ml of water. What is the concentration of the solution if you dissolve the Tylenol in the water?
Answer:
The concentration is 50%
Explanation:
Mass-Volume concentration is molarity (M) times 100% or [tex]\frac{Gsolute}{Lsoln}[/tex] * 100%
For this problem, we need to convert from milligrams to grams and milliliters to liters in order to plug the values into the equation and solve for the concentration.
So, 250 mg = 0.025g (there are 1000 mg in 1 g)
And 500ml = 0.05 L (there are 1000 ml in 1 L)
Now we can solve for the concentration
[tex]\frac{0.025 g}{0.05 L}[/tex] [tex]* 100[/tex] %= 0.5 [tex]* 100[/tex] % = 50% of Tylenol concentration
As a forensic expert, Jane needs to handle many biological evidence samples simultaneously. What is the basic precaution that she should take
while doing so?
OA
air dry all the samples
B.
use a new pair of gloves for each piece of evidence
malaman
store samples in humid conditions
Ос.
OD.
use plastic bag for storage
Answer:
B. use a new pair of gloves for each piece of evidence
Explanation:
When it comes to the basic precautions of handling biological evidence samples, one has to prevent cross contamination. This refers to the transfer of DNA from one evidence to another evidence; thus, it is important for Jane to use a new pair of gloves for each piece of evidence in order to prevent such occurrence.
Wearing of gloves will also prevent Jane's DNA from being implanted into the sample, and it will keep her safe from contracting blood-borne pathogens like those in the saliva, blood or semen.
Use your periodic table of elements. Take any element from the second column, except for beryllium and calcium, and answer the following
questions: (5 points)
What is the element's name and symbol?
Is it a meial, nonmetal, or metalloid?
Which family does it belong to?
How many protons, neutrons, and electrons does its neutral atom have?
Answer:
Radium (Ra)
Metal
Alkaline Earth Metal
Protons & Electrons: 88
Neutrons: 138
Explanation:
Answer:
magnesium, Mg, metal, alkaline earth metals, its neutral atom has 12 protons and 12 neutrons and 12 electrons
3. Why was the International System of Units adopted?
Answer:
Explanation:
Because the units are specifically designed in such a way that anyone, anywhere could reproduce them. They are based on scientifically developed definitions. For example the meter is defined as
Current definition (1983): The distance traveled by light in vacuum in [tex]{\displaystyle {\frac {1}{299792458}}}{\displaystyle {\frac {1}{299792458}}}[/tex]second.
That does not look like a great improvement, but it is certainly better than the distance of 1/10,000,000 of the distance between the meridian going through Paris going from the North Pole to the equator. How would you even measure that without a guess somewhere?
The subunits are also much better. 1/10 of a meter is much easier to dial with than a foot or a yard which is very arbitrarily defined.
Explanation:
The international System of Units adopted to facilitate measurements of diverse quantities.
A student measures the time it takes for two reactions to be completed.
Reaction A is completed in 12 seconds, and reaction B is completed in 21
seconds. What can you conclude about the rates of these reactions?
A. The rates of reactions A and B are equal.
B. The rate of reaction A is lower.
C. The rate of reaction B is lower.
Answer:
c
Explanation:
because the left side of reactant is take more time to make a product than the first
The rate of these reactions should be considered as the option b. The rate of reaction A is lower.
Conclusion of the rate of reactions:Since Reaction A is completed in 12 seconds, and reaction B is completed in 21 seconds.
So based on this, we can say that the rate of reaction A should be lower as it contain 12 seconds as compared to reaction b.
hence, the option b is correct.
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Why is no chemical reaction necessary to extract gold?
Explanation:
Because gold is a very unreactive metal and exists as a pure substance (instead of oxides).
What is the most likely oxidation state of nitrogen?
A. +3
B. -2
C. +4
D. 3
Pls don’t steal points you’ll be reported
Answer:
-3
Explanation:
How much heat will a 45.00 g piece of glass require to change its temperature from 10 to 30 °C. The specific heat capacity is 0.500 J/g°C.
675 J
225 J
450 J
700 J
Answer:
Q = 450 J
Explanation:
Given that,
Mass of a piece of glass, m = 45 g
The temperature changes from 10°C to 30°C.
The specific heat is 0.5 J/g°C
We need to find heat required to raise the temperature. The formula that is used to find it is given by :
[tex]Q=mc\Delta T\\\\Q=45\times 0.5\times (30-10)\\\\Q=450\ J[/tex]
So, the required heat is 450 J. Hence, the correct option is (c).
Which of the following correctly shows the word equation for the reaction of aluminum and copper oxide yielding aluminum oxide and copper?
A. aluminum + aluminum oxide → copper + copper oxide
B. aluminum + copper oxide → aluminum oxide + copper
C. aluminum oxide + copper → aluminum oxide + copper
D. copper + aluminum → copper oxide + aluminum oxide
Answer:
The correct answer is B
Explanation:
Educere
aluminium + copper oxide → aluminium oxide + copper. Hence, option B is correct.
What is a word equation?A word equation represents a chemical reaction using the names of the substances involved.
aluminium + copper oxide → aluminium oxide + copper correctly shows the word equation for the reaction of aluminium and copper oxide yielding aluminum oxide and copper.
Hence, option B is correct.
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What is the Average Speed?
Distance: 10m
Time: 55
0 2m/s
15m/s
50m/s
O 20m/s
Answer:
0.2m/s
Explanation:
speed =d/t
10/55= 0.181
approximately 0.2m/s
Answer: it is b.
Explanation: Average Speed = Total Distance
Total Time
= 10m/5s
=2m/s
Hope this helps!!
Pls Help this is my last question on the quiz - Which two types of energies involve changes in atoms or atom rearrangement?
Sound & Mechanical
Thermal & Electrical
Nuclear & Chemical
Radiant & Sound
Answer:
Sound & Mechanical (i think)
Explanation:
which atomic particle has about the same mass as a proton but has no electrical charge?
Answer:
neutrons ................
is LaCl3 an ternary ionic compound
Answer:
yes
Explanation:
a ternary compound is a compound containing three different elements. An example is sodium phosphate, Na3PO4. The sodium ion has a charge of 1+ and the phosphate ion has a charge of 3-. Therefore, three sodium ions are needed to balance the charge of one phosphate ion.
how heavy is one atom of hydrogen/
Answer:
Answer⤵The number in a mole, Avogadro's number, is related to the relative sizes of the atomic mass unit and gram mass units. Whereas one hydrogen atom has a mass of approximately 1 u, 1 mol of H atoms has a mass of approximately 1 gram.How many grams in 1.000 moles of oxygen gas?
can someone pls answer this i’ll love you
Answer:
we kno you already do :)
