Answer:
2NaCl + 2H2O --> Cl2 + 2NaOH + H2
Explanation:
Please help me with this I’ve been on this question for 10 minutes now...
Answer:
A
Explanation:
we know that pangea was when all the continents were connected and the tectonic plates moved, causing pangea to split into multiple pieces. so north america was formed by moving tectonic plates.
i hope this helps :))
meaning of carbon cycle
The carbon cycle is nature's way of reusing carbon atoms, which travel from the atmosphere into organisms in the Earth and then back into the atmosphere over and over again. Most carbon is stored in rocks and sediments, while the rest is stored in the ocean, atmosphere, and living organisms
4 steps of Carbon Cycle
Photosynthesis, Decomposition, Respiration and Combustion.
Family members on a camping trip decide to make hot cocoa after dinner. They add instant cocoa mix to hot water. What can they do to make the cocoa mix dissolve faster?
A stir the hot cocoa
B halve the amount of water
C double the amount of cocoa mix added
D add the cocoa mix after the water cools
Answer:
Your ANSWER:
A.stir the hot cocoa
Explanation:
stirring helps particals dissolve faster
Which of the following has a higher electronegativity oxygen or selenium?
Answer: Oxygen
Explanation: Oxygen has more ionisation energy and Oxygen has a small size which makes it more electronegative.
What pair of elements have the same number of valence electrons?
a) Li and Na
b) Mg and K
c) Ti and Nb
d) Rb and Zr
The ans is A.
You need to refer back to the periodic table n find the 2 the is under the same grp.
Answer: its A
Explanation:
What are diatomic molecules and are they compounds? PLEASE ANSWER ASAP!!
Answer:
Diatomic molecules consist of two atoms that are chemically bonded. The two atoms can be the same or different chemical elements. As for whether or not they are compounds, there is not technically an answer. This is because all compounds are molecules, but not all molecules are compounds. For example diatomic molecules that comprise the chemical compounds nitric acid, carbon monoxide, and hydrogen chloride are made up of two different elements. As you can see, most diatomic molecules are not made up of the same kind of elements and not every diatomic molecule comprises a chemical compound.
hope this helps :)
Explanation:
What is the negatively charged sub-atomic particle of an atom?
A) Proton
B) Neutron
C) Electron
Explain why the mass number of oxygen is 16
Answer:
Oxygen has an atomic number of 8 , and the mass number of an atom is the sum of its atomic number plus its neutron number. We got the mass as 16 units, and so it'll have 16−8=8 neutrons.
Explanation:
Forces can be represented by _____,
called vectors, that show the direction of a force.
Answer:
vector
Explanation:
Heat is most closely related to which kind of energy? O nuclear Oelectrical thermal chemical
Answer:
thermal
Explanation:
Answer:
thermal energy
Explanation:
because thermal energy produces heat
A ____________ contains specific instructions for making proteins.
a.
chromosome
b.
gene
c.
molecule
d.
ribosome
please help asap !! i don’t know if that’s the right answer
Answer:
b, c and d (last three options)
Explanation:
It can't be the first one because:
On the left hand side there is one of everything and then on the right, ther is one zinc, two chloride and 2 hydrogen atoms. It is unbalanced
Second one:
there are 8 carbons on both sides, 20 hydrogens on both sides and 26 oxygen on both sides. It is balanced
Third
1 copper on both sides, 2 hydrogens on both sides and 1 oxygen on both sides. It is balanced
Fourth
4 silver on both sides and 2 oxygens on both sides
A foam square has a mass of 25 g and a volume of 90 mL. What is the density?
Answer:
The answer is 0.28 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
So we have
[tex]density = \frac{25}{90} = \frac{5}{18} \\ = 0.277777...[/tex]
We have the final answer as
0.28 g/mLHope this helps you
The research and design team of a car manufacturing company is developing a new safety product that automatically
tests a car's brakes. When the team discusses how exactly they plan to determine whether the new technology is
successful or not, what stage of technological design are they in?
O first
O second
third
O fourth
The team should discuss the plan to determine whether the new technology is successful or not in the fourth stage. The correct option is D.
What are different stages of technology testing?When a company manufactures any item, he test it before sending it to the market. This is called technology testing. The test goes from four stages. Here, the item is car's break.
Thus, the correct option is D, fourth stage.
Learn more about technology testing
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engineers create a new metal that i stronger than steel but much lighter
Answer:
Yes. True
Explanation:
Yes, this is true that engineers can make a lighter, cheaper, stronger material. Currently this metal is used for aircraft, and is easy to manufacture.
A small block of wood floats on water. It has a volume of 25cm^3 and a mass of 20 grams. What is the density of the wood?
Answer:
The answer is 0.8 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{20}{25} = \frac{4}{5} \\ [/tex]
We have the final answer as
0.8 g/cm³Hope this helps you
Observe: Scandium is the first element to contain electrons in the d subshell. How many orbitals does the d subshell have, and how many electrons can fit in the d subshell?
Answer: 5 orbitals
Explanation:
Each d subshell has 5 orbitals, with 10 electrons. So it's like for every orbital, there are 2 electrons. Look at orbital diagrams (if your teacher made you draw them), and you will see that an arrow pointing both UP AND DOWN represent 2 electrons (arrow upward=1 electron, arrow downward=1 electron)
Here, we are required to determine how many orbitals does the d subshell have, and how many electrons can fit in the d subshell.
The d subshell has 5 orbitals.The number of electrons that can fit in the d subshell is; 10 electronsThe d subshell is first recorded in the shell with energy level 3.
The orbitals in an atom are organized into different layers or electron shells. The d subshell has 5 orbitals in it.
This is evident from the formular; 2l + 1.
where l = 2 for the d subshell.
As with any sub-orbital, the sub-orbitals in the d-subshell also contain 2 electrons each.
According to Pauli's exclusion principle, the two electrons in each must have opposing spin.
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Gravitational potential energy depends on the strength of gravity, ________ and ________ of the object.
options:
height and mass
friction and movement
mass and movement
height and friction
The answer is A Height and Mass
Gravitational potential energy depends on the strength of gravity; A. height and mass of the object.
Gravitational potential energy (G.P.E) can be defined as the energy possessed by a physical object or body due to its position (height) above planet Earth.
Hence, gravitational potential energy (G.P.E) is highly dependent on mass, height of an object or body and the acceleration due to gravity.
Mathematically, gravitational potential energy (G.P.E) is given by the formula;
[tex]GPE = mgh[/tex]
Where:
G.P.E is the gravitational potential energy. m is the mass of an object. g is the acceleration due to gravity. h is the height of an object.In conclusion, the three (3) main factors that gravitational potential energy (G.P.E) depends on are:
I. Strength of gravity.
II. Height.
III. Mass.
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How many atoms are in a sample of 2.89 moles of potassium (K)?
Answer:
The answer is
1.74 × 10²⁴ potassium atomsExplanation:
To find the number of atoms given the number of moles we use the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
n = 2.89 moles
We have
N = 6.02 × 10²³ × 2.89
We have the final answer as
1.74 × 10²⁴ potassium atomsHope this helps you
In the reaction 4AI+_O2 2AI2O3, what coefficient should be placed in front of the O2 to balance the reaction?
Answer: 3
Explanation: I took the k12 quiz
Ciara’s bike has rusted, which means that the iron in the metal changed to rust.
What has occurred?
an energy formation
an exothermic reaction
a chemical reaction
a precipitate formation
Answer:
CChem Reaction
Explanation:
Cuz it big brain time
The iron in the metal changed to rust, which is a chemical reaction. Therefore, option (C) is correct.
What is the rusting of iron?The rusting of iron is an oxidation reaction in which the iron combines with oxygen in the air in the presence of water to produce Fe₂O₃.xH₂O, a hydrated iron (III) oxide.
This hydrated iron (Ill) oxide is rust and the color of rust is reddish-brown. This reddish-brown rust can be seen on iron nails, pipes, and railings. on. Rust is formed when the iron is exposed to oxygen in the presence of moisture and is not an instantaneous reaction. Rusting of iron takes place over a long period of time.
Fe (s) + O₂ (g) + xH₂O (l) → Fe₂O₃. xH₂O (s)
The oxidation state of iron increases which is followed by the loss of electrons as a result of the rusting reaction. Iron(III) oxide or ferric oxide has the iron atom has an oxidation state of +3.
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PLSSS HELP WILL GIVE A LOOT OF POINTS
The diagram below shows two metal plates at different temperatures. Plate X is 30 degrees Celsius ( oC) and Plate Y is 50 degrees Celsius ( oC).
A.Plate X will become cooler and Plate Y will become cooler.
B.Plate X will become warmer and Plate Y will become cooler.
C.Plate X will become cooler and Plate Y will become warmer.
D.Plate X will become warmer and Plate Y will become warmer.
Answer:
I think B but I'm not sure.
Answer:
C.
Explanation:
A lunar eclipse is when the sun goes in front of the Moon?
Answer:
Explanation: When the Moon passes between Sun and Earth, the lunar shadow is seen as a solar eclipse on Earth. When Earth passes directly between Sun and Moon, its shadow creates a lunar eclipse. Lunar eclipses can only happen when the Moon is opposite the Sun in the sky, a monthly occurrence we know as a full Moon. Hope this helps and u have a good day <3
how many valence electrons does tungsten have
Answer:74
Explanation:
Answer:
I believe Tungsten has 2 valence electrons.
Explanation:
Hope this helps!
How could you measure the average kinetic energy of a group of particles
Answer:
Temperature measures the average kinetic energy of the particles in a substance. Thermal energy measures the total kinetic energy of the particles in a substance. The greater the motion of particles, the higher a substance's temperature and thermal energy.
Explanation:
Are hemoglobin formation and functioning brains and muscles benefits of Iron?
Which type of reaction has the general formula of AB + CD→ AD + CB
Answer:
Double replacement reactions
Explanation:
CD are two reactant compounds, while AB and CB are two product compounds that results from the reaction, in this type of reaction B and D change places
Which of the following is/are correct about light?
A.
Light always travels at the same speed.
B.
Light cannot travel through liquids.
C.
Light energy travels as waves.
D.
all of these
Answer:
D. Light energy travels as waves.
HELP QUICK What is the mass of an object that has a volume of 2 ml and a density of 10g/ml?
Answer:
The answer is 20 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 10 × 2
We have the final answer as
20 gHope this helps you
What is the average atomic mass for Element X?
Answer:
the average atomic mass for element X is 28
