Answer:
(A) there are 12
Explanation:
bc
Which of the following represents a type of change (physical or chemical) that is different from the rest?
a
Setting an inflated balloon on fire
b
Stretching a balloon before blowing air into it
c
Deflating a balloon by releasing all the air present in it
d
Twisting a long balloon to change its shape to form a flower
Answer:
a
Explanation:
what is one reason why we use salt in cooking
Answer:
It's used as a seasoning for the taste of food. It also helps to bring out the natural flavours in the food.
A student found a pretty rock while hiking with her family. She discovered
that the rock will scratch glass, but not her steel knife.
Mohs Hardness Scale
Take
Gypsum
5
Apatite
6
Orthoclase
Caleite
Fluorite
7
Quartz
8
Topaz
9
10
Corundum Diamond
finger nail penny
glass knife
According to the Mohs Hardness Scale shown above, what does the
student know about the rock? (6.6C, 6.2E)
F. It is harder than quartz, but softer than topaz.
G. It is harder than fluorite, but softer than quartz.
H. It is harder than calcite, but softer than fluorite.
Answer:
If the rock can't scratch a knife, but glass, it's a 7-10 (Hard Rock)
It's between Quartz and Topaz.
So the answer is,
F.An ion of calcium has a charge of 2+. The ion contains 18 electrons. How many protons does a neutral atom of calcium possess?
18
20
36
2
2
Answer:
Explanation:
The ion and the neutral atom both contain 20 protons. Generally the protons stay in the nucleus forever.
Help
SOS
IM SUPER CONFUSED
Answer:
reactant
Explanation:
oxygen is the one causing the change
Answer:
It is the one that is going into it so i think reactant
Explanation:
Sorry if i am wrong
a student conducts an experiment to test how the temperature affects the amount of sugar that cab dissolve in water. In the experiment, she uses 100 milliliters of water in each trial and stirs for five minutes each time.
What is the dependent variable?
a. the time stirred
b. the temperature of the water
c. the amount of water
d. the amount of sugar
Answer:
Answer: B) the temperature of the water
Explanation: The independent variable is the one that is manipulated or changed
PLEASE HELP
Which diagram represents a gas that has been ionized?
Answer: It would have to be Diagram 4
Explanation: That is the only one that looks Ionized and you can hook up a picture of an Ionized Diagram online. That can also help with this question.
Describe the correct electron dot diagrams for the first ten elements of the periodic table.
Answer:
Describe the correct electron dot diagrams for the first ten elements of the periodic table. H and Li will each have one dot, He and Be will each have two dots, B will have three, C will have four, N will have five, O will have six, F will have seven, and Ne will have eight. Sulfur has 16 electrons in its atoms.
how to you distinguish dilute nitric acid and concentrated nitric acid using chemical methods?
Answer:
I have two methods to distinguish between concentrated and dilute nitric acid
Method 1: Using magnesium/manganese.
Mg + 2HNO₃ (1%) → Mg(NO₃) + H₂
very very dilute
Mg + 4HNO₃ → Mg(NO₃)+ 2H₂O +2NO₂
concentrated
In the first reaction of magnesium with concentrated nitric acid, hydrogen is evolved.
In the second reaction of magnesium with very very dilute nitric acid, water is evolved.
Using the respective tests for hydrogen and water, we can test them.
Method 2: Using iron.
3 Fe + 8HNO₃→ 3Fe(NO₃)₂ + 4H₂O + 2NO
dilute
Fe + 6HNO₃→ Fe(NO₃)₃ + 3H₂O + 3NO₂
concentrated
In the first case of method 2,
Fe(NO₃)₂ ⇆ Fe²⁺ + (NO₃) ⁻ Iron with valency 2+ is formed
In the second case of method 2,
Fe(NO₃)₃ ⇄ Fe³⁺ + (NO₃) ⁻ Iron with valency 3+ is formed
Brainlist pls!
Why concentrated HNO3 is 69% by mass of nitric acid? Please explain what it means.
Answer:
See the answer below
Explanation:
The percentage by mass of a substance in a mixture is the ratio of the mass of the substance and the mass of the entire mixture.
Hence, when concentrated HNO3 is said to be 69% by mass of nitric acid, it means that the solution of the acid has 69% HNO3 and 31% water in terms of mass. More specifically, 100 g of the solution of the acid would contain 69 g of HNO3 and 31 g of water respectively,
what is the density of a block marble that occupies 255 cm^3 and has a mass of 1000g
Answer:
3.92 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{1000}{255} \\ = 3.921568...[/tex]
We have the final answer as
3.92 g/cm³Hope this helps you
What are the physical and chemical properties of compounds most influenced by?
As the names suggest, a physical change affects a substance's physical properties, and a chemical change affects its chemical properties. Many physical changes are reversible (such as heating and cooling), whereas chemical changes are often irreversible or only reversible with an additional chemical change.
(hope this helps ^^)
How can I figured out if molecular polarity is polar or non-polar?
Answer:
if the arrangement is symmetrical and the are equal length it is non polar
it the arrows are different lengths and if they do not balance each other or if the arrangement is asymmetrical they are polar
Report writing about air pollution ! Thx if u answered ‼️
Answer:
Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog. Air pollution is the presence of substances in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials. There are different types of air pollutants, such as gases, particulates, and biological molecules. Air pollution is caused by solid and liquid particles and certain gases that are suspended in the air. These particles and gases can come from car and truck exhaust, factories, dust, pollen, mold spores, volcanoes and wildfires. Air pollution can also cause headaches, dizziness, and nausea. ... Long-term health effects from air pollution include heart disease, lung cancer, and respiratory diseases such as emphysema. Air pollution can also cause long-term damage to people's nerves, brain, kidneys, liver, and other organs. The most basic solution for air pollution is to move away from fossil fuels, replacing them with alternative energies like solar, wind and geothermal. Producing clean energy is crucial. But equally important is to reduce our consumption of energy by adopting responsible habits and using more efficient devices.
Its sad of what our world has become
8 sentence paragraph:
Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen, and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog. Some air pollutants are poisonous. Inhaling them can increase the chance you'll have health problems. People with heart or lung disease, older adults, and children are at greater risk from air pollution. Air pollution isn't just outside like the air inside buildings can also be polluted and affect your health.
I am playing with my
Answer:
wow ok have fun
Explanation:
Answer:
hiiiiiiiii
Explanation:
thank you
1. Part A: Use the periodic table to order the following Period 3 elements from smallest to largest atomic radius: aluminum (Al), sulfur (S), and chlorine (Cl). Choose the appropriate order from the options below:
From the arrangement in the periodic table, the increasing order of the atomic radius is Chlorine < Sulfur < Aluminum.
The periodic table has been the arrangement of the elements with increasing atomic numbers and similarities. The elements comprising of the same valence electrons are arranged in the same group.
In the periodic table, on moving down the group there has been the atomic size has been increased with the increase in the shell on each period. The increase in the electrons in the same shell results in the increase in the attraction force and thus, the atomic size decreases across the period.
From the arrangement in the periodic table, the increasing order of the atomic radius is Chlorine < Sulfur < Aluminum.
For more information about the atomic radius, refer to the link:
https://brainly.com/question/9629555
What is the cathode of a galvanic cell made with magnesium and gold?
OA. Magnesium ions
O B. Gold ions
C. The magnesium electrode
D D. The gold electrode
Answer:
The cathode of a spontaneous electrochemical cell is the cell in which metal cations undergo reduction. The electrons are supplied by the anode. Without much thought, we can conclude magnesium is much less favorably reduced than gold.
The branch of science which deals with chemicals is called chemistry.
The correct option to the question is B.
The system in which the compound is breakdown into its ionic components is called a galvanic cell. In this cell there are two rods, These rodes are as follows:-
AnodeCathodeIn the given question, the cathode is the rode in which electrons enter into the galvanic cell. The cathode is defined as the negatively charged rode.
Hence, the correct option is B that is gold ions.
For more information, refer to the link:-https://brainly.com/question/25026730
Which element’s atoms have the greatest average number of neutrons?
Answer:
not sure but i guess it's Tellurium
I need help tutor it is hard
If you need help, ask a parent or teacher. Or yes, one of us can help! Just let us know what you're having trouble with, and we can see how we can help.
What is the difference between a conductor and an insulator?
A) An insulator allows electricity to flow through it easily and a conductor does not
B) A conductor allows electricity to flow through it easily and an insulator does not.
C) An insulator is magnetic and a conductor is not
D) A conductor is magnetic and an insulator is not
Answer:
A conductor allows electricity or heat to flow through it easily and an insulator does not.
Explanation:
The difference between a conductor and an insulator is a conductor allows electricity to flow through it easily and an insulator does not.
What is conductor?A conductor is a material that conducts electricity. Most metals are good conductors. The best conductors are single element materials such as copper(Cu), silver(Ag), gold(Au), which are characterized by atoms with only one valence electron very loosely bound to the atom. What is an insulator?A material that does not easily transmit energy such as electric current or heat is called insulators. All materials contain electrons. The electrons in insulators like rubber are not free to move. They are tightly bound inside atoms.Hence, we can conclude that option B is the correct answer.
To learn more about conductor and insulator here
https://brainly.com/question/20102785
#SPJ2
how do i tell someone how i feel?
The reaction 2KBr(s) →+ Br2(l) + 2K(s) is a
Decomposition reaction
Answer: True
Explanation:
I'm not sure if this was the question.
true or false/Air masses are responsible for the weather in a region
Answer:
False
Explanation:
The air masses are not responsible for weather , it is cause by the Earth evolution
Water gas
3
Copper oxide and carbon dioxide are made when copper carbonate is heated strongly. Which
is a product?
(1 Point)
Heat
Copper carbonate
Copper oxide
Oxygen
The product : Copper oxide
Further explanationGiven
Word equation
Required
The product of the reaction
Solution
The chemical equation can be expressed in terms of:
words equation the skeleton equation balanced equationIf we state the word equation above into a chemical equation(with formula)
CuCO₃ ⇒ CuO + CO₂
This reaction is a type of decomposition reaction
AB⇒A+B
Where the copper carbonate is decomposed into copper oxide and carbon dioxide
As we know, in a chemical reaction, the reactants are on the left and the products are on the right
So that the products of this reaction are copper oxide and carbon dioxide and the reactants are copper carbonate
hey so i dont get this help please
Answer:
ta da
Explanation:
2. How much energy must be removed from a 50.0 g sample of steam in order to get it to condense
into a liquid? (assume the steam is at 100 ℃)
Answer:
113 kJ or 113,000J
Explanation:
Since we are condensing it, a physical change in the state of matter is occurring. 113 kJ or 113,000J because of the following equation: Q = 2260 times 50. 2260 is the Heat of Vaporization constant.
differeniate between speed and acceleration
Answer:
speed is always positive
acceleration may be positive or negative
speed is scalar quantity
accleration vector quantity
Which answer is an isotope of 40/20x?
Question Pictured here:
An isotope of ₂₀⁴⁰X ⇒₂₀⁴⁴X
Further explanationThe elements in nature have several types of isotopes
Isotopes are atoms that have the same number of protons and a different number of neutrons.
So Isotopes are elements that have the same Atomic Number (Proton)
In the following element notation,
[tex]\large {{{A} \atop {Z}} \right X}[/tex]
X = symbol of elemental atom
A = mass number
= number of protons + number of neutrons
Z = atomic number
= number of protons = number of electrons, on neutral elements
For symbol of isotope X :
₂₀X⁴⁰ : atomic number = 20, mass number = 40
A. ₄₀²⁰X : atomic number = 40, mass number = 20, neutrons=20
B. ₂₀⁴⁰X²⁺ : atomic number = 20, mass number = 40, neutrons=20
C. ₂₁⁴⁰X : atomic number = 21, mass number = 40, neutrons=19
D. ₂₀⁴⁴X : atomic number = 20, mass number = 44, neutrons=22
Two isotopes of potassium are K-37 and K-42. Explain, in terms of subatomic particles, why K-37
and K-42 are isotopes of potassium.
What is the "octet rule?"
a.
The octet rule says that atoms are most stable when they have a full shell of electrons in the outermost shell
c.
The octet rule says that any atom can form a maximum of eight covalent bonds
b.
The octet rule states that the sum of all electrons in the lower subshells must equal eight
d.
None of the above
Answer:
A
Explanation:
The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds. When discussing the octet rule, we do not consider d or f electrons. Only the s and p electrons are involved in the octet rule, making it useful for the main group elements (elements not in the transition metal or inner-transition metal blocks); an octet in these atoms corresponds to an electron configurations ending with s2p6 .
Answer:
it's A
The octet rule is a chemical rule of thumb that reflects the theory that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas. An exception to an octet of electrons is in the case of the first noble gas, helium, which only has two valence electrons.
Explanation:
please mark me as brainliest thank