Answer: When we represent a chemical reaction in terms of words, we write a word equation. For example, when hydrogen gas reacts with oxygen gas to form water, we can write a word equation for the reaction as follows: hydrogen + oxygen→ water To the left of the arrow, we have the 'before' situation.
Explanation:
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Answer:
4 Ethanol has a boiling point of 89 C at standard pressure.
What is the noble gas configuration for Cobalt?
a
[Ar] 4s2 3d7
b
[Ar] 4s2 4d7
c
[Kr] 4s2 4d7
d
[Kr] 4s2 3d7
Answer:
a. [Ar] 4s2 3d7
Explanation:
Describe the structure and properties of an atom.
Name 10 elements and their chemical symbols.
Describe the three types of bonds.
Describe the pH scale and differences between acids and bases.
Describe the different states of matter on Earth.
Explain the law of conservation of matter and the law of conservation of energy.
1. Structure of an atom:-
The basic structure of an atom includes a tiny, relatively massive nucleus, containing at least one proton and usually one or more neutrons.Outside of the nucleus are energy levels (also called shells), which contain one or more electrons.
Properties of an atom:-
The neutrons have the greatest mass and have no charge. The protons have slightly less mass than the neutrons and are positively charged. The electrons have almost no mass and are negatively charged. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons.
2. Elements and their chemical symbols :-
1) Sodium - Na
2) Carbon - C
3) Magnesium - Mg
4) Aluminium - Al
5) Silicon - Si
6) Chlorine - Cl
7) Potassium - K
8) Calcium - Ca
9) Copper - Cu
10) Iron - Fe
3. ionic bond
Covalent bond
Metallic bond
4. pH scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions are measured to have lower pH values than basic or alkaline solutions
5. There are four natural states of matter: Solids, liquids, gases and plasma.
6. Law of conservation of mass :
The 'law of conservation of mass' says that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. The mass of the products in a chemical reaction must equal the mass of the reactants.
Law of conservation of energy :-
According to the law of conservation of energy, energy can only be transformed from one form to another. It can neither be created nor destroyed. The total energy before and after the transformation always remains constant.
all matter has ____. A.mass B.weight C.color D.volume btw it is multiple choice. please help
Answer: mass
Explanation:
We are encouraged to follow the 3 W's --
--Wait 6 feet apart
--Wear a mask over your nose and mouth
--Wash your hands throughly.
Which of these 3 W's would you consider to be a rule you follow in every science lab?
In your answer:
1. State the W
2. Explain why you think this is important for Science Safety.
Answer: Wash your hand Througly
Explanation:The things you handle in a lab can be dangerous and seeing as though it is a common habit to touch your skin and your face the things handled can make you and others sick. Washing your hands after every science lab session is essential to lab and outside lab safety.
Explain whether the formula CuO can be used to represent both Copper oxide(1) and Copper(2) Oxide
Answer:
See explanation
Explanation:
Oxide has a 2- charge.
Copper (I) Oxide = Cu2O
Copper (II) Oxide = CuO
The formula CuO can not be used to represent both copper I oxide and copper II oxide.
The formula of an ionic compound takes into account the oxidation state and valency of the the metal cation which is usually shown as a Roman numeral in the name of the compound.
For the compound copper I oxide, the correct representation of the compound is Cu2O. This shows that oxygen has a valency of 2 while copper has a valency of 1 in the compound.
The correct representation of copper II oxide is CuO. In the compound, both copper and oxygen have valency of 2.
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F 1.00 \(\rm mol\) of argon is placed in a 0.500-\(\rm L\) container at 21.0 \({\rm \, ^{\circ}C}\) , what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation)? For argon, \(a = 1.345 \;\rm (L^2\cdot atm)/mol^2\) and \(b = 0.03219\; \rm L/mol\).
Answer:
2.05 atm
Explanation:
From ideal gas equation;
PV=nRT
Making P the subject of the formula;
P= nRT/V
Substituting values;
P= 1 × 0.0821 × 294/ 0.5
P= 48.27 atm
Real gas pressure;
(P + an^2/v^2) . (V - nb) = nRT
(P + 1.345 × 1^2/0.5^2) . (0.5 - 1 × 0.03219) = 1 × 0.0821 × 294
(P + 5.38) . (0.46781) = 24.1374
(P + 5.38) = 24.1374/0.46781
(P + 5.38) = 51.5966
P= 51.5966 - 5.38
P= 46.22 atm
Difference = Pideal - Preal
Difference = 48.27 - 46.22
Difference = 2.05 atm
HELP ASAP
The diagram below shows some subatomic particles.
What is the particle that is labeled with a question mark (?) in the diagram?
Answer:
The Answer Is Quarks
Explanation:
Its mad up of Quarks
i hope this helps
pls make me brilliant or something
The particle that is labeled with a question mark (?) in the diagram is Quarks
Quarks are elementary particles and fundamental constituents of matter. They are considered the smallest known particles that make up protons and neutrons, which are the building blocks of atomic nuclei. Quarks are classified as fermions, which means they follow the rules of quantum mechanics and obey the Pauli exclusion principle.
There are six known types, or flavors, of quarks: up (u), down (d), charm (c), strange (s), top (t), and bottom (b). Each quark flavor has a unique set of properties, including mass, electric charge, and the way they interact with other particles through the strong nuclear force. The up and down quarks are the lightest and most common, while the top quark is the heaviest.
One notable property of quarks is that they possess a fractional electric charge. The up quark has a charge of +2/3 (e/3), while the down quark has a charge of -1/3 (-e/3), where "e" represents the elementary charge carried by an electron. Quarks are never found in isolation due to the confinement principle, which means they are always bound together in composite particles called hadrons.
Quarks interact through the strong nuclear force, which is mediated by particles called gluons. This force binds quarks together to form protons and neutrons, and also governs the interactions within atomic nuclei.
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Temperature (°C)
Heating Curve for Water
160
140
120
100
80
60
40
20
0
-20
1 2 3 4 5 6 7 8 9 10
Time (min)
At what temperature does the solid start melting?
O -20°C
0°C
O 20°C
O 80 c
Answer:
heating point for water - 100°
The melting point (MP) of a substance is the temperature at which it melts. A solid's melting point is a physical characteristic that can be used to identify a substance. Here the correct option is B.
The melting point of a solid is the temperature at which it begins to liquefy. A substance's normal melting point is its melting point under atmospheric pressure. Ice often melts at 0 degrees Celsius.
A physical process called melting or fusing causes a substance to change its phase from a solid to a liquid. This happens when the solid's internal energy rises, usually as a result of heat or pressure being applied, which raises the substance's temperature to the melting point.
Thus the correct option is B.
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33) How many significant figures does the number 40230 have? *
Answer:
5
Explanation:
they are all significant All non-zero numbers ARE significant
Can you guys please help me .. I don’t know we’re they go I only did one . Please help me this 6th grade work And I’m new to this pleaseee I will give you brainlest :( ? I’m only 11 .
Answer:
2.cohesion 3.adhesion 4. polar molecule 5. changing states 6. condensation 7.capilary action 8.adhesion 9. changing state 10. evaporation
Are atoms the smallest particles we know about, or are there smaller ones?
Answer:
subatomic particles are smaller then atoms
In order to survive, plants absorb sunlight, water, and nutrients from the soil. What property is this?
Plants are unique organisms that can absorb nutrients and water through their root system, as well as carbon dioxide from the atmosphere. Soil quality and climate are the major determinants of plant distribution and growth.
Which statement describes what is happening at the plate boundary in this section of a tectonic map?
Two plates are sliding past each other.
Two continental plates are colliding.
An oceanic plate is subducting.
The seafloor is spreading.
Answer a, is the answer i guess also guys take up the answers so no one else can get annoyed
Answer:
A
Explanation:
I took the quiz and I believe this was the correct answer.
table salt has a density of 2.16g/cm3. a cylindrical box holds 4.25 kg of salt. what is the volume, in cm3 occupied by the salt in the box?
Given parameters:
Density of table salt = 2.16g/cm³
Mass of table salt = 4.25kg = [tex]\frac{0.00425}{2.16}[/tex][tex]\frac{0.00425}{2.16}[/tex]g (1000g = 1kg)
Unknown:
Volume of table salt = ?
Solution:
To find the volume of the table salt, let us state the relationship between density, mass and volume.
Density is the mass per unit volume of substance.
Density = [tex]\frac{mass}{volume}[/tex]
Since the unknown is volume;
Density x volume = mass
Volume = [tex]\frac{mass}{density}[/tex]
Input the parameters and solve';
Volume = [tex]\frac{0.000425}{2.16}[/tex] = 1.97 x 10⁻³cm³
Volume of the table salt is 1.97 x 10⁻³cm³
How many significant figures in 0.002010 ?
A gold cube is 150.00 mm long, 10.00 cm wide, and 0.95 m thick. If gold has a density of 19.3g/cm3. Calculate the mass of the gold cube.
Help?
Answer:
V = l * w * h
V = 150.00 mm x 1cm/10 mm x 10.00 cm x 0.95 m x 100 cm/1 m = 1.4 x 104 cm3 D = M/V
M = D * V = 19.3 g/cm^3 * 1.4 * 104 cm^3 = 2.7 x 10^5 g = 270000 grams
2. An object has a mass of 10 grams and a volume of 5 cm3. What is the density of the object?
Answer:
The answer is 2 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
We have
[tex]density = \frac{10}{5} \\ [/tex]
We have the final answer as
2 g/cm³Hope this helps you
what’s the independent and dependent variable?
Answer:
independent variable: a variable (often denoted by x ) whose variation does not depend on that of another.
dependent variable: a variable (often denoted by y ) whose value depends on that of another.
Explanation:
Where are alkaline earth metals found on the periodic table?
O Group 1
O Group 2
O Groups 3-12
O Group 17
Answer:
group 2
Explanation:
because they are the only alkalines earth metals on the periodic table
Answer:
b
Explanation:
Why do you think properties of materials used would be considered a constraint?
Answer:
For a material to be considered as building material, it should have required engineering properties suitable for construction works. These properties of building materials are responsible for its quality and capacity and helps to decide applications of these material. Such properties of building materials are categorized as follows. 1. Physical properties 2. Mechanical properties 3. Chemical properties 4. Electrical properties 5. Magnetic properties 6. Thermal properties
Explanation:
The mitochondria in a cell is most like a_______in its function
Answer: microbe Rickettsia prowazekii
Explanation:
Which element has a melting point of -157°c
Answer:
Krypton (Kr)
Explanation:
Krypton's melting point is -157.36°c
Pleaseeee help neeeeee
Answer:
B
Explanation:
Condensation happen when water is warmed up in room temperature against a cold surface like water vapor
How many electrons would Pd have if it had a +2 charge?_ How many electrons would Pd have if it had a +2 charge?
Answer:
80
Explanation:
W know that, the atomic no of lead (Pb) is 82. The no of protons is equal to the atomic no.
No of protons = 82
It has a charge of +2. It means that its lacks 2 electrons. No of electrons is :
e = 82-2
e = 80
Hence, Pd will have 80 electrons now.
Look at the periodic table, Gold, Silver, Sodium, and Aluminum are all what type of element?
Answer:
They are all in Group 11.
Explanation:
Look at the periodic table!
The elements gold, silver, sodium, aluminum are all metals. Gold and silver is transition metals. Sodium is in s block and aluminum is a p block elements in periodic table.
What are metals?Metals are electropositive elements able to conduct electricity and because of the presence of a pool of free electrons.
Metallic elements forms ionic bonds with non-metals. Gold and silver are transition metals or d-block elements. They are highly conducting and silver is a common component in electrical devises.
Aluminum is a p-block element it is in 13th group and sodium is a first group element and is called as an alkali metal. Hence, all the given elements are metals.
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What makes the atomic radius change along a period in the periodic table?
A. The increased atomic mass makes the atomic radius bigger.
B. More electrons in the valence shell make the radius bigger.
C. More electrons pair in orbitals, making the atomic radius smaller.
D. More protons in the nucleus pull the electrons in, making the
atomic radius smaller
Answer:
D
Explanation:
More protons in the nucleus pull the electrons in, making the atomic radius smaller. Therefore, the correct option is option D.
The atomic radius is determined by the nucleus's balance between the attracting force of positively charged protons and the repelling force of electrons.
The most crucial element in calculating the average atomic radius is not Option A. Although atomic mass typically increases with time, increasing nuclear charge has a greater impact on atomic size.
Over time, Option B has no discernible impact on atomic radius. Although the number of valence electrons changes over time, increasing nuclear charge has the biggest impact on atomic size. The valence shell is the outermost electron shell.
The gradual decrease in atomic radius is unaffected by Option C. The most frequent electron pairing occurs within orbitals of the same energy level, and it has little impact on atomic size over a period.
Therefore, the correct option is option D.
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does changing the size of a substance affect its density
Answer:
yes
Explanation:
give me example of analyze
Answer: analyze the question so that you can get a correct answer
Explanation:
What happens to the temperature of a substance during a change of state?
A. It increases quickly.
B. It changes gradually.
C. It decreases quickly.
D. It stays the same.
Answer:
Explanation:
It remains the same!