Answer:
Gold is an extremely rare element on Earth. Because it doesn't react with very many other elements, it is often found in its native form in the Earth's crust or mixed with other metals like silver. ... Gold is also found in ocean water.
Explanation:
4Al(s) + 3O₂(g) --> 2Al₂O₃, how many atoms are there? *
10 points
Answer:
12 atoms
but u said there are 10 pts but only 5 are there
Answer:
[tex]6.02 \times {10}^{24} \: atoms[/tex]
Step-by-step explanation:
Number of atoms of Al = Number of moles of Al × Avogadro constant
[tex] = 4 \times 6.02 \times 10 ^{23} [/tex]
[tex] = 2.408 \times 10 ^{24} \: atoms[/tex]
Number of atoms of O = Number of moles of O × Avogadro constant
[tex] = 6 \times 6.02 \times {10}^{23} [/tex]
[tex] = 3.612 \times 10 ^{24} \: atoms[/tex]
Total number of atoms
[tex] = 2.408 \times {10}^{24 } + 3.612 \times {10}^{24} [/tex]
[tex] = 6.02 \times {10}^{24} atoms[/tex]
Chromium has a smaller atomic radius than iron. *
O
True
False
Answer:
False
Explanation:
Atomic radius is defined as the distance between the nuclei of 2 identical atoms that are bonded together
Now, from periodic tables, chromium has a calculated atomic radius of 1.66 Å while iron has a calculated atomic radius of 1.56 Å
Thus, chromium has a bigger atomic radius than iron.
So the statement is false.
What do animals do with the carbon dioxide produced in their cells during cellular respiration?
A Store it for later use.
B Reuse it during photosynthesis.
C Exhale it in the breathing process.
D Combine it with water to make sugar.
Answer:
c
Explanation:
animals are not plants
Answer:
C Exhale it in the breathing process they release it back
Hydrogen gas caught fire quickly in the Hindenberg accident. In comparison, neon gas and helium gas are nonreactive. This is why helium is safe for aircraft and neon is safe for electrical signs. Which statement best explains why helium and neon have similar chemical properties?
Answer:
Helium and Neon have similar chemical properties because both of them completely fill the outer shell of their atoms' electrons, so there is nothing to share with other atoms, neither with the same element nor with any other element.
Explanation:
Helium and Neon are both noble gases . As elements react, their atoms, by losing, acquiring, or sharing electrons, complete their outer shells. Noble gas atoms already have full outer shells, so there is no tendency for them to lose, gain, or share electrons. There are incomplete outer shells of atoms of group 1 and 7 elements (so they are reactive)
Chemical properties of HELIUM and NEON -:
In group 8(or 0) of the periodic table, on the far right side, the Noble Gases are contained. Helium, neon, argon, krypton, xenon and radon are their names. They are extremely colourless and unreactive. They do not form bonds, so they still remain as single (monatomic) atoms. There is very little chemical reactivity in them.Hence, helium and neon have similar chemical properties as they are the most stable due to having the maximum number of valence electrons their outer shell can hold.
What is a cinder cone volcano composed of after it erupts to form a volcano?
Answer:
They are built from particles and blobs of congealed lava ejected from a single vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone.
Explanation:
hope it helps :)
Which number indicates the energy level of an atom's valence electrons?
O A. The period number
O B. The group number
O c. The atomic number
O D. The mass number
Answer:A, The Period Number
Explanation:
just took the test
What trend does the atomic radius follow along a period on the periodic
table?
O A. The atomic radius gets smaller the farther right it appears on the
periodic table.
O B. The atomic radius stays constant across the periodic table.
O C. The atomic radius increases as the number of protons increases
across the table.
O D. The atomic radius gets larger the farther right it appears on the
periodic table.
In a complete reaction, 23 grams of sodium reacts with 37 grams of chloride , what is the total mass of sodium chloride produced (made)?
Answer:
60 grams NaCl
Explanation:
Because it is a complete reaction, the total mass of all the reactants is used. According to the law of conservation of mass, the same amount product should be produced as there was reactants. Add the mass together.
23+37= 60 g
Which of the following produces a chemical change?
O A. Boiling water
B. Burning candle wax
O C. Cooling molten lava
O D. Grinding iron into powder
Option B= Burning candle wax
Answer:buning candle wax B
Explanation:
A P E X
1. When the velocity of an object changes, it is acted upon by a(n)
deceleration.
inertia.
momentum.
force.
Answer:
when the velocity of an object changes,it is acted upon by an external force
When the velocity of an object changes, it is acted upon by a force. Therefore, option D is correct.
What causes a change in velocity explain ?Forces have an impact on how objects move. They can cause motion; they can also slow, stop, or change the direction of motion of an already moving object.
We can say that forces cause changes in velocity because they cause changes in an object's speed or direction. Keep in mind that acceleration is defined as a change in velocity.
Because velocity is a vector quantity, the given statement is correct. It is affected by both magnitude and direction. When one or both of them change, the velocity changes as well.
Thus, When the velocity of an object changes, it is acted upon by a force, option D is correct.
To learn more about velocity, follow the link;
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What is the pneumonic of the metric line
Answer:
Explanation:
Mnemonic Device: Kings Hate Dragons Because Dragons Can't Make Money. Explanation: to remember the Metric prefixes, or the decimal ladder, and base unit (Kilo, Hecto, Deca, Base, Deci, Centi, Milli, Micro).
When a substance undergoes a chemical change its identity does not change true or false
__ P4(s) + __ O2(g) → __ P4O10(s) To balance this reaction equation, first write correct formulas for the reactants and products, leaving the stoichiometric coefficients blank. We will balance P first. How many P4 molecules are needed to balance P for each P4O10?
Answer:
P4(s) + 5 O2 (g)→ P4O10
Explanation:
If we desire to write a balanced chemical reaction equation, the rule of thumb is simple; the number of atoms of each element on the right hand side of the reaction equation must be the same as the number of atoms of the same element on the left hand side of the reaction equation. Once this condition is satisfied, the reaction equation is said to be balanced.
As we can see, we need one mole of P4 and five moles of O2 to produce one mole of P4O10.
The balanced reaction for the combustion of phosphorus (P₄) to form phosphorus pentoxide (P₄O₁₀),
P₄(s) + 5O₂(g) → P₄O₁₀(s)
So, 1 P₄ molecule is needed to balance the number of phosphorus atoms for each P₄O₁₀ molecule.
A balanced equation is a chemical equation in which the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side. In other words, the law of conservation of mass is satisfied, meaning that no atoms are created or destroyed during the chemical reaction.
The coefficients (numbers in front of the chemical formulas) in a balanced equation represent the relative proportions of each reactant and product involved in the reaction. This ensures that the total mass of the reactants is equal to the total mass of the products in a chemical reaction.
Learn more about Balanced equation, here:
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ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
What did Ernest Rutherford's model of an atom look like?
plum pudding
a random mixture of protons, neutrons, and electrons
a single, individual atom
a nucleus surrounded by electrons
Answer:
A single individual atom
Explanation:
The atom has a tiny massive core called the nucleus. It contains positive energy called the protons and negative charge called the electrons. The empty space b/w the nucleus and the electron takes up most of thr volume of the atom.
Please correct me if I'm wrong.
Answer:
A nucleaus surronded by electrons
The outside temperature is
35°C. What is the temperature in
K
Answer:
308.15
Explanation:
308.15K − 273.15 = 35°C
Directions: Find the scale for and volume shown in each graduated cylinder. You should estimate the final place.
Inaccuracies of 11% are acceptable.
A. Scale of this G.C.-33
-40
40
A. Scale of this G.C.
B. Explain your answer to A
B. Volume Shown
C. Volume Shown 33
-301
A. Scale of this G.C.
-30
A. Scale of this G.C.
B. Volume Shown
B. Volume Shown
-12
C. What do you think is the
maximum volume of this GC and
why?
-8
-11
strate the
I need to write the definition with an example what it means.the word is opaque
Answer: opaque means not able to see through. An example is that a window is not opaque because you can see through it, but a rock is opaque.
Answer:
Opaque Definition below:
Explanation:
not able to be seen through; not transparent.
Hope it helps :)
what property of material does salt possess
Answer:
Salt crystals are translucent and cubic in shape; they normally appear white but impurities may give them a blue or purple tinge. The molar mass of salt is 58.443 g/mol, its melting point is 801 °C (1,474 °F) and its boiling point 1,465 °C (2,669 °F).
What would happen if you mixed baking soda and milk?
Answer:
it'll produce carbondioxide bubbles
Answer:
it would prevent the milk from curdling
Explanation:
baking soda is regularly added to milk, believe it or not
Questions
Answer all please
Answer:
Both,
Both,
Vertical
Explanation:
When you push a lawn mower, you can be moving up and down or across, when your pushing a wheel barrel you can do the same, when you do a push up your going up and down which is vertical.
which has the greatest amount of energy a glass of water at 20 degrees or a glass of water at 80 degrees
Answer:
80 degrees
Explanation:
if you think about it 80 degrees is hotter than 20 degrees if I'm not right tell me in the comments please
40 points Plz Help me
Safety in the lab has to be a priority at all times when doing an investigation. Describe how you demonstrated good safety practices by using goggles during the lab. Why was it important for you to wear goggles during the lab?
Answer:
so the chemical doesn't get in ur eyes
Explanation:
In a___ one line represents one pair of electrons being shared.
Choices:
A. Structural formula diagram
B. Dot diagram
C. Space-filling model
D. Ball-and-stick model
Which is the best way to determine if an object is made of pure silver?
Answer:
The Nitric Acid Test is used to check if silver is pure or plated. To do so, file a small part of the item in a discreet area where it cannot be seen. Apply a few drops of nitric acid. If the area turns into creamy white, the silver is pure or sterling.
Explanation:
Which of the following is NOT how compounds are formed?
Group of answer choices
Atoms give away electrons to other atoms
Atoms accept electrons from other atoms
Atoms share electrons with other atoms
Select the correct answer.
Which formula describes Newton's second law of motion?
OA force = mass x acceleration
rn abs
OB. force =
acceleration
Ос, force = mass x velocity
OD force =
velocity
mass
The correct answer describes Newton's second law of motion : A. Force = mass x acceleration (F=m.a)
Further explanationNewton's 2nd law states that :
the acceleration from the applied force is proportional to the resultant force and inversely proportional to the mass
Can be formulated
[tex]\tt a=\dfrac{F}{m}[/tex]
or
[tex]\tt F=m\times a[/tex]
F = force, N
m = mass, kg
a = acceleration, m/s²
Write the symbol for every chemical element that has atomic number greater than 11 and atomic mass less than 24.8
Answer: You would write elements in period 1, 2, 3, and period 4 but you would stop at chromium
Explanation: It would have been too long for me to write every symbol
What is the percentage of propane in natural gas??
Bob rides his motorcycle with a constant speed of 116 km/h. How far can he travel in 1 hour?
Answer:
116 km...
Explanation:
as mentioned in the question, speed is constant....as it is clearly given the speed is 116 km per hour....so it will go 116km in an hour.
Please help me, please
Answer:
A. Metal
Explanation:
Hope this helps! :)
If this wasn't what you were looking for please don't hesitate to comment again! Have a nice day/night! :)
Answer:
Metal
Explanation:
they deleted my answer so I am putting it back sorry