Answer:
O
2−
:
Explanation:
The atomic number of O=8=number of electrons
Number of electrons in O
2−
are 8+2=10
Electronic configuration will be 1s
2
2s
2
2p
6
You would like to find the density of an unusually shaped piece of jewelry. Since the piece of jewelry has an irregular shape, you need to use displacement to calculate the volume. In a 300 ml beaker you pour 200 ml. Of water. When you place the piece of jewelry in the beaker, the water level rises to 278 ml. Upon placing the object on the triple beam balance, you find that it weighs 122 grams. Given this information, calculate the density. SHOW YOUR WORK
Volume displaced by jewelry, V = 278 - 200 = 78 ml
Also, 1 ml = 1 cm³
We know, by water displacement method the volume of water displaced by an object it equals to its own volume.
So, volume of jewelry, V = 78 ml = 78 cm³.
Also, weight of jewelry is , w = 122 gm.
Now, we know density is given by :
[tex]d=\dfrac{w}{V}\\\\d=\dfrac{122\ gm}{78\ cm^3}\\\\d=1.56\ gm/ cm^3[/tex]
Hence, this is the required solution.
Which of the following substances would have a fixed shape and volume at room temperature?
Group of answer choices
aluminum (solid)
rubbing alcohol (liquid)
lemonade (liquid)
helium (gas)
Answer:
aluminum (solid)
Explanation:
Solids have fixed shape and volume at room temperature.
Matter is defined as any substance that has weight and occupies space. There are three main classes of matter;
SolidLiquidGasSolids are particles have strong attractive force between them. This confers a fixed shape and volume on them.
Liquids are mostly fluids that takes up the shape of containers they occupy. The have intermediate strength of attractive forces.
Gases have weak forces and do not have fixed shape or volume. They take up the shape of any container they are introduced into.
PHOTO ABOVE
Answer Choices:
-Sp
-Sp2
-Sp3
-Sp4
I don’t get this!
Answer:
By just counting sigma bond and lone pair in central atom , one can easily find hybridization.
CO2 sp
SO2 sp2
NH3 sp3
BCl3 sp2
help me please, i have 20 auestions
Answer:
B
Explanation:
PE=m*delta(h)*g
So 0.75*1.5*9.8 equals PE
=11.025 so round up
Based on your knowledge of chemical equations, what do you know for sure
about this equation?
Pls help I need it I’m dumb but I do need it! *here a pic*
A ____ is a region of strong magnetic activity on the photosphere the Sun.
(A) sunspot
(B) flare
(C) Coronal mass ejection
(D) Solar wind
The acceleration of a moving object can be calculated by dividing the change in velocity by the change in blank
Answer:
The acceleration of a moving object can be calculated by dividing the change in velocity by the change in TIME
Explanation:
Took the practice
2 horizontal and parallel lines are intersected by 2 diagonal lines to form a triangle with exterior angles. The top angle of the triangle is 47 degrees. The exterior angle created by the right side of the triangle and the top horizontal line is x degrees. The bottom left angle of the triangle is y degrees. The exterior angle of the bottom right angle is z degrees above the horizontal line and 63 degrees below. Which statements about the diagram are true? Select three options. x = 63 y = 47 z = 117 x + y = 180 x + z = 180
Answer:
x = 63
z = 117
x + z = 180
Explanation:
edg 2020
Answer:
Explanation:
c
1.C3H8 + O2 --> H2O + CO2
(5 Points)
Balanced
O Unbalanced
Answer:
Unbalanced
Explanation:
The balanced equation would be:
C3H8 + 5 O2 ---> 4 H2O + 3 CO2
if we are made of stardust, does that make you feel more or less important as an individual (or just the same), and why?
I have a rock with the mass of 4.8 and a volume of 2.3.
What is the Density?
Theres no select the answer, i have to type it, and i have no clue. 18 points, brainliest if you can tell me three things along with the density of the rock: 3 more answers of density that are close to the real answer.
+Brainliest, Friend request, 18 points, thanks, and 5 star rating!
Answer:
Density = 2.08695652174
Explanation:
Density = Mass ÷ Volume
This gas is found in the stratosphere where it helps protect us from UV radiation.
A) ozone.
B) oxygen.
C) nitrogen.
D) carbon dioxide.
Answer:
A.Ozone
Explanation:
How does the mass of an electron compare to the mass of a proton and a
neutron?
A. The mass of an electron is much greater than the mass of a
proton or a neutron.
B. The mass of an electron is greater than the mass of a proton but
less than the mass of a neutron.
C. The mass of an electron is much less than the mass of a proton or
a neutron.
D. The mass of an electron is greater than the mass of a neutron but
less than the mass of a proton.
Answer:
C. The mass of an electron is much less than the mass of a proton or
a neutron.
Explanation:
When we compare the mass of an electron to that of proton or neutron, the mass of an electron is much less than the mass of a proton or a neutron.
Electrons are negatively charged particles in an atom
Protons are positively charged particles
Neutrons do not carry any charges.
The relative mass of an electron compared to that of a proton is [tex]\frac{1}{1840}[/tex] This is a very small valueElectrons generally have mass of 9.11 x 10⁻³¹kgProtons weigh 1.67 x 10⁻²⁷kgNeutrons weigh 1.68 x 10⁻²⁷kgWe can see that electrons have very small mass and this is why when calculating the mass of an atom, we use the sum of the number of protons and neutrons.
Which of the following is an example of a compound?
Ο Α.
water
O B.
carbon
O C.i
iron
O D.
copper
Answer:
A. water H2O, everything else is a single element C,Fe&Cu
Explanation:
Which property is a chemical property of a substance?
color
melting point
reactivity
boiling point
Answer:
Reactivity! :)
Explanation:
I just took the test! "2.13 Physical and Chemical Changes"
Reactivity is the chemical property of the substance. Therefore, option (C) is correct.
What are the chemical properties?A chemical property can be described as the property that causes a change in the chemical structure of the substance. A chemical property of a substance can be seen in chemical change or reaction in the substance.
A chemical property represents the ability of a substance to combine with other substances or convert into a different product. The chemical composition is the identity of the substance and on changing it the substance turns into a different substance.
A chemical property gets determined when a change occurs in the chemical identity of the substance. The chemical properties such as toxicity, reactivity, enthalpy of formation, the heat of combustion, oxidation states, radioactivity, etc.
The color, melting point, and boiling point are the physical properties of a substance while reactivity is the chemical property.
Learn more about Chemical properties, here:
https://brainly.com/question/1935242
#SPJ2
how many nuetrons are in chlorine 37?
Answer:
18
Explanation:
An element with 17 protons will always be chlorine. However an element's mass numbers can vary, which means that it can have different numbers of neutrons. So although chlorine has a mass number of 35 which means it has 18 neutrons.
Please hurry up and help me my teacher needs the answer NOW!
Answer:
3+(10G)=DG
ER_K5(O5G)+29K
Explain how errors in measurements can affect the safety of products?
Answer:
Its can affect the safety of products by, for example, if you put raw chicken in the oven and don't cook it for long enough, it can make you sick
Explanation:
The difference between the calculated and precise worth is referred to as an error or defect. For example, if the two machinists use the same device to detect measurement mistakes, it is not necessary that they obtain the same results. However, there will be a little difference between the two measurements, which is referred to as an error.
Which type of reaction has will give brainliest to first correct answer
the general formula of AB + CD → AD + CB?
ОООО
synthesis
decomposition
oxidation
replacement
Answer:
I think it's replacement because the B and D just swap places in the end equation
Answer:
that would be replacment
Explanation:
if you look at the formula the B and D are replaced with each other
synthesis is when it looks like A+B--> AB
decompositions looks like AB--> A+B
and oxydation is when the states of atoms are changed so it would include things like +1, -1 etc
Mercury, the only metal that is liquid at room temperature, has a density of 13.6g/cm^3. How much does 25cm^3 of mercury weigh?
Answer:
The mercury with volume of 25 cm³ having weight of 340 g.
Explanation:
Given data:
Density of mercury = 13.6 g/cm³
Volume of mercury = 25 cm³
Mass of mercury = ?
Solution:
We will apply density formula.
d = m/v
13.6 g/cm³ = m/ 25 cm³
m = 13.6 g/cm³ × 25 cm³
m = 340 g
The mercury with volume of 25 cm³ having weight of 340 g.
some help would be very much appreciated !!
Answer:
a = 6 m/s².
Explanation:
If we have the object with mass of 75 kg and force on it is 50 N then according to given statement its acceleration is 3m/s².
When we double the force on same object by keeping the mass constant then the acceleration will also double. It means force will be 100 N and acceleration will be 6 m/s².
But if we we increase the mass then acceleration goes to decrease.
So,
mass = 75 kg
F = 50 N
a = 3m/s² then by double the amount of force,
mass = 75 g
F = 100 n
a = 6 m/s².
This is actually explain the newton second law. This law stated that the acceleration of object is depend upon its mass and force acting on it.
F= m. a
a = F/m
Thus acceleration is directly proportional to the force and inversely proportional to the mass.
Help me please !!!
Which of the following can be inferred from the diagram above that shows the dependence of potential Energy on the Internuclear distance between two atoms?
A)The atoms form a bond with a bond length of 25 pm
B)The atoms form a bond with a bond length of 75 pm
с)The net force between the atoms is attractive at 25 pm
D)The net force between the atoms is attractive at 75 pm
Answer:
Its B. The atoms form a bond with a bond lenth of 75 pm
which element has a grater atomic radius ?phosphorus or bismuth?
According to periodic trends, bismuth has the greatest atomic radius.
different forms of genes for a single trait
Answer:
different forms of genes for a single trait
Explanation:
There are three main forms of genes that can exist for a single trait and they are:
Dominant alleleRecessive alleleCo-dominant allelesWhat are the different forms of genes for a single traitA dominant allele is a stronger version of a gene that shows up when at least one copy of it is present in an organism's genetic makeup. It hides the effects of the weaker gene. In a person with two different alleles, the one that is more powerful decides how the person looks or behaves.
Recessive allele: A recessive allele is only expressed when there are two of the same recessive alleles present. It is hidden by a strong gene. The recessive allele can only be seen when a person has two copies of it.
Co-dominant alleles: When co-dominant alleles are together, both are shown. In this situation, neither gene is stronger than the other, and both play a role in what an organism looks like. One example of co-dominance is the ABO blood type system. In this system, both the A and B alleles are of equal importance.
Read more about genes here:
https://brainly.com/question/1480756
#SPJ6
What are atoms made up of
They're made up of three main parts: protons, neutrons and electrons. Think of the protons and neutrons as together forming a “sun”, or nucleus, at the centre of the system. The electrons orbit this nucleus, like planets. If atoms are impossibly small, these subatomic particles are even more so.
3. The manipulation of living organisms to produce desired products or results is known as...
a. Sustainability
b. Biotic Factor
c. Biotechnology
d. Abiotic Factor
Answer:
C. Biotechnology
Explanation:
In its broadest definition, biotechnology is the application of biological techniques and engineered organisms to make products or modify plants and animals to carry desired traits. This definition also extends to the use of various human cells and other body parts to produce desirable products.
Which sentence describes a characteristic of matter
Answer: Matter takes up space and has mass
Explanation:
Literally the definition of mass
The ________variable is the one the experimenter has chosen to investigate
dependent
control
experimental
independent
When calcium carbonate is heated, it decomposes to form calcium oxide and carbon dioxide. This reaction is represented by the following equation: CaCO3 arrow CaO+ CO2
ii from the balanced equation, state the number of moles of calcium
oxide produced
Answer:
Chemical reaction involved is:
CaCO
3
→CaO+CO
2
Molar mass of CaCO
3
=40+12+16×3=100 g
According to the balanced reaction 100 g of CaCO
3
produces 1 mol of CO
2
i.e. 22.4 L at STP.
∴50 g CaCO
3
will produce
100
22.4
×50=11.2 L CO
2
at STP.
please mark me as the brainliest answer and please follow me for more answers to your questions.. if you want to follow me you should first click on my name and you will see follow button.. pls click on the follow button..
Considering the reaction stoichiometry, from the balanced equation and reation stoichiometry, the number of moles of calcium oxide produced is 1 mole.
Chemical reactions are characterized by the appearance of new substances from others. That is, they are processes in which the nature of the substances changes, that is, from some initial substances called reagents, totally different ones called products are obtained.
In this case, you know that the balanced reaction is:
CaCO₃ → CaO + CO₂
Stoichiometry establishes relationships between the molecules or elements that make up the reactants of a chemical equation with the products of said reaction. In other words, stoichiometry determines the ratios between reactants and products in a chemical reaction.
The stoichiometry of a chemical reaction is perfectly established by the chemical equation. In it, the formulas of reactants and products appear preceded by numbers (the stoichiometric coefficients) that indicate the proportions according to which the transformation occurs.
The stoichiometric coefficients of a chemical equation are due to the fact that the atoms present before the reaction must be the same after the reaction, even though the atoms will have been rearranged to produce new substances.
In this case, by reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:
CaCO₃: 1 moleCaO: 1 moleCO₂: 1 moleIn summary, from the balanced equation and reation stoichiometry, the number of moles of calcium oxide produced is 1 mole.
Learn more:
brainly.com/question/16487206?referrer=searchResults brainly.com/question/14446695?referrer=searchResults brainly.com/question/11564309?referrer=searchResults brainly.com/question/4025026?referrer=searchResults brainly.com/question/18650135?referrer=searchResultsin the universe what can mass be defined as
Answer: Mass is both a property of a physical body and a measure of its resistance to ... Inertial mass is the mass of an object measured by its resistance to acceleration. ... back to the fact that we have not really defined what a force is. ... Then we can measure the mass of any other object in the universe ...