Answer: An object can change velocity in a number of ways: it can slow down, it can speed up, or it can change direction. A change in speed, or a change in direction, or a change in both speed and direction means that the object has a change in velocity.
Explanation:
How many anions are there in 1.50 g of MgBr2?
Answer:
9.75564x10^21
Explanation:
Moles of MgBr2=Mass/Molar Mass
=1.50grams/184.113g/mol
=0.0081mol(because the grams cancel out)
2 x 0.0081mol= 0.0162mol
0.0162 x 6.022 x 10^23(because avogadro's #)= 9.75564x10^21
hope this helps!!
9.75564x10^21 anions are there in 1.50 g of MgBr2
what are the difference between cation and anion ?Cations and anions are both ions, the cation are negatively charges ions where as anions are positively charged ions.
These ions are atoms or molecules either gain or loss of one or more valence electrons, giving the ion a net positive or negative charge.
If the chemical species has more protons than electrons, it carries a net positive charge. If there are more electrons than protons, the species has a negative charge. The number of neutrons determines the isotope of an element but does not affect the electrical charge.
Cations with a net positive charge like Silver Ag+, Hydronium: H3O+, Ammonium: NH4+ where as Anions with a net negative charge Hydroxide anion: OH-, Oxide anion: O2-, Sulfate anion:SO42-.
Moles of MgBr2=Mass/Molar Mass
=1.50grams/184.113g/mol
=0.0081mol(because the grams cancel out)
2 x 0.0081mol= 0.0162mol
0.0162 x 6.022 x 10^23= 9.75564x10^21
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On a cold winter day, Delia puts logs into a fireplace. Then she strikes a match and sets the logs on fire. As the fire burns, which two forms of kinetic energy are released from the burning log?
o light and thermal
o electrical and light
thermal and electrical
O electrical and chemical
Answer:b
Explanation:
For the following questions, use a periodic table and your atomic calculations to find the unknown information about each isotope:
You have a Helium Isotope with 2 neutrons. What is the mass number?
2
4
4.0026
6
Answer:
Option B is correct.
4
Explanation:
We know that an atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example, if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
In given problem we are given with 2 neutrons of helium. We know that the atomic number of He is 2. Thus Mass number of He is,
Number of neutrons + number of proton
2 + 2 = 4
Thus, option B is correct.
If the density of a substance is 15g/ml what would the volume be if it has
a mass of 10g?
Answer:
the answer would be 0.666 mL
Explanation:
10g is 66% of 15g
How many grams are in 3.67 moles of lithium cyanide
Answer: 120.9 grams
Explanation:
Given the question : How many grams are in 3.67 moles of Lithium cyanide?
Chemical formula of lithium cyanide = LiCN
Molar mass of LiCN: Li = 6.941 ; C = 12, N = 14
LiCN = (6.941 + 12 + 14). = 32.941 g/mol
(Gram of substance / mole of substance) = (molar mass of substance / one mole)
(Gram of substance / 3.67) = (32.941 / 1)
= gram * 1 = 3.67 * 32.941
Gram of substance = 120.89347
= 120.9 grams
List the two factors that affect ionic bond
Answer:
ionization energy and electronegativity
Explanation:
A duck flies 60 meters in 10 seconds. What is the duck’s speed?
Answer value
I will mark Brainlyest
what is the composition of carbohydrates
Maintain the creaminess of your ice cream products! We here at Creamy Transport ensure that your ice cream products are transported safely to their destination with the quality intact. Our mobile storage maintains an ice cream-friendly temperature of –18°C. No fluctuations and no melting! We maintain ice cream crystals at their creamiest size of 15 µm. You and your ice cream delights will be delighted by our service!
You found several studies related to the service provided by the company. Which data will you use to make an informed decision? Check all that apply.
data from a celebrity magazine
data verified by other studies
data provided by an ice cream manufacturer
data gathered once to show the reliability of the company
data from a report put out by a government agency50 brainly points
Answer:B: data verified by other studies
C:data provided by an ice cream manufacturer
E: data provided by an ice cream manufacturer
Answer:
the answer is A,B,E
Explanation:
edge 2022
I have a balloon below and I squeeze it until it is about to pop. This is decreasing the volume. What happens to the pressure inside? What are the molecules doing inside?
Answer:
Pressure goes up
Explanation:
The pressure is inversely proportional to the volume. So when volume is decreased the pressure rises.
The molecules are getting pushed closer together and more collisions occur which will also increase the temperature.
How much force would it take to push a friend who has a mass of 70 kg to accelerate at the rate of 4 m/s2? F = M*A *
30 N
280 N
17.5 N
.057 N
Answer:
The answer is 280 NExplanation:
The force acting on an object can be found by using the formula
Force = mass × accelerationFrom the question
mass = 70 kg
acceleration = 4 m/s²
We have
force = 70 × 4
We have the final answer as
280 NHope this helps you
Which property of a rock determines its color?
its grain size
its method of formation
its mineral composition
its coarse-grain content
Answer:
its mineral composition
Explanation:
The atomic bonds within a mineral generally determine which wavelengths of light will be absorbed and which will be reflected. Those wavelengths that are reflected back to our eyes determine the color of the mineral. Some minerals have free electrons that will absorb certain wavelengths of light.
Mineral composition is the property of a rock that determines it's color.
What is a rock?A rock is a naturally occurring solid that comprises of different minerals or substances which fuses together or solidified together to form a very big solid mass.
Therefore, Mineral composition is the property of a rock that determines it's color.
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If 18*10`23 molecules of H2 react with nitrogen, how many moles of NH3 are produced
Answer:
0.2moles
Explanation:
Given parameters:
Number of molecules of H₂ = 1.8 x 10²³molecules
Unknown:
Number of moles of NH₃ = ?
Solution:
The reaction equation is given as:
N₂ + 3H₂ → 2NH₃
Let us solve from the known to the unknown specie;
Since the number of molecules is 1.8 x 10²³molecules of H₂;
6.02 x 10²³molecules will give 1 mole of a substance
1.8 x 10²³molecules will produce [tex]\frac{1.8 x 10^{23} }{6.02 x 10^{23} }[/tex] mole of H₂
= 0.3moles of H₂
From the balanced chemical equation;
3 moles of H₂ produced 2 moles of NH₃
0.3 moles of H₂ will yield [tex]\frac{0.3 x 2}{3}[/tex] = 0.2moles
Silicon is produced for the chemical and electronics industries by the following reactions. Give the balanced equation for each reaction. (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
a. SiO2 (s) + C(s) + Si(s) + CO(g) SiO2(s) + C(s) Si(s) + CO(g)
b. Liquid silicon tetrachloride is reacted with very pure solid magnesium, producing solid silicon and solid magnesium chloride. + +
c. Na2 SiF6(s) + Na(s) + Si(s) + NaF(s) Na2SiF6(s) + Na(s) Si(s) + NaF(s)
Answer:
Explanation:
The equations in each option are confusing (repeated) but understandable
Balancing a chemical equation means the same number of individual and overall atoms on the reactant side is equal to the same number of individual and overall atoms on the product side. This is based on the law of conservation of matter which states that matter can neither be created nor destroyed, hence the no atom must be unaccounted for on any side.
The balancing of these equations seem to test the knowledge of a particular trick in balancing of equation - which will be highlighted as the equation is balanced
(a) To balance
SiO₂(s) + C(s) ⇒ Si(s) + CO(g)
The balanced equation will be
SiO₂(s) + 2C(s) ⇒ Si(s) + 2CO(g)
NOTE: The best way to address equations like this to balance the uniatomic element last.
(b) SiCl₄(l) + Mg(s) ⇒ Si(s) + MgCl₂(s)
The balanced equation will be
SiCl₄(l) + 2Mg(s) ⇒ Si(s) + 2MgCl₂(s)
NOTE: As noted earlier, the uniatomic molecule should be balanced last
(c) To balance
Na₂SiF₆(s) + Na(s) ⇒ Si(s) + NaF(s)
The balanced equation will be
Na₂SiF₆(s) + 4Na(s) ⇒ Si(s) + 6NaF(s)
NOTE: As noted earlier, the uniatomic molecule should be balanced last
Please, always sum the number of individual and overall atoms on both sides when you are done answering questions like this just to be sure.
what is a noble gas in the same period as Zr
Answer:
Xe
Explanation:
noble gas is in the last column of the periodic table.
Zr is in Period 5
16. A baseball has a mass of 1500 grams and displaces 500 ml. of water. What is
it's density?
Answer:
3.00 g/mL
Explanation:
Step 1: Given data
Mass of the baseball (m): 1500 g
Volume of the baseball = Volume of water displaced (V): 500 mL
Density of the baseball (ρ): ?
Step 2: Calculate the density of the baseball
The density is equal to the mass divided by the volume.
ρ = m/V
ρ = 1500 g/500 mL
ρ = 3.00 g/mL
Give the percent yield when 28.16 g of CO2 are formed from the reaction of 8.000 moles of C8H18 with 16.00 moles of O2.
Answer:
Percent yield of CO₂ is 6.25 %.
Explanation:
Given data:
Percent yield of CO₂ = ?
Actual yield of CO₂ = 28.16 g
Number of moles of C₈H₁₈ = 8.000 mol
Number of moles of O₂ = 16.00 mol
Solution:
Chemical equation:
2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O
Now we will compare the moles of C₈H₁₈ and O₂ with CO₂.
C₈H₁₈ : CO₂
2 : 16
8.000 : 16/2×8.000 = 64 mol
O₂ : CO₂
25 : 16
16 : 16/25×16= 10.24 mol
Less number of moles of CO₂ are produced from 16 moles of O₂. it will limit the yield of CO₂.
Grams of CO₂ produced:
Mass = number of moles × molar mass
Mass = 10.24 mol × 44 g/mol
Mass = 450.56 g
Percentage yield of CO₂:
Percentage yield = actual yield / theoretical yield × 100
Percentage yield = 28.16 g/ 450.56 g× 100
Percentage yield = 6.25 %
Which activity demonstrates chemical weathering?
A= dissolving of limestone by acid rain
B= grinding of talc into a powder
C=freezing of water in the cracks of a sandstone sidewalk
D= abrasion of a stream bed by tumbling rocks
The answer is A, to my brain power ig B)
Chemical weathering is the decomposition of rocks and minerals by chemical means. Dissolving limestone by acid rain is an example of chemical weathering. Hence, option A is correct.
What is weathering ?Weathering is the process of decomposition of rocks and minerals in the earth by some physical or chemical factors. Weathering by heat, pressure and wind are called physical weathering.
Reaction with acids, water or air also lead to weathering of rocks. The chemical reaction taking place there can decompose the rock and form new products make cracks and color changes in the rocks.
Lime stones are made of calcium carbonate. When limestone reacts with an acid , it decomposes into its salt and carbon dioxide. Therefore, it is an example of chemical weathering. Hence, option A is correct.
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How are xylem and phloem related to a plant's growth
A: Xylem transports and stores water and water-soluble nutrients in vascular plants. Phloem is responsible for transporting sugars, proteins, and other organic molecules in plants.
how to convert anisole to salicylic acid
Answer:
ipfiyf8y97guog7
Explanation:
oyviyvhlvoyvhlvouuoupvpu
In the Bohr model of an atom (shown), protons are represented in blue, the neutrons are red and the electrons are green. How reactive is the element that this model represents?
the answer choices :
a. Highly reactive because the model has two complete electron shells
b. Highly reactive because the model is showing only one valence electron.
c. Non-reactive because the model is showing only one valence electron
d. Non-reactive because the model is showing two complete electron shells
Answer:
B
Explanation:
Valence electrons are the number of electrons out the outermost shell of the diagram. In this diagram, there is one valence electron. This means that it is highly reactive since the shell is not complete and needs other elements to be able to complete the outermost shell. If this model had a full outermost shell, then it would not be reactive (noble gases).
In the Bohr model of an atom, the element that this model represents is highly reactive because the model is showing only one valence electron.
To ascertain how reactive an element is, we have to look at its valence shell. In the Bohr model, electrons are arranged around the nucleus in shells.
If we look at the model shown, the valence (outermost) shell has only one electron which is easily lost.
This model corresponds to a highly reactive group 1 alkali metal.
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How do you calculate the amount of reactants and products in a chemical reaction?
Mass of products is exactly equal to mass of reactants. A mole-mole factor is a ratio of the moles for any two substances in an equation.
What is the law of mass of conservation ?The law of mass of conservation states that the the mass of the reactant is exactly equal to the mass of the product.
According to this law, matter can be neither created nor be destroyed. The mass of collection of objects never changes, no matter how the parts are rearranged.
To calculate the amount of atoms that are reacting, and they always be the same as the product because the law of conservation states that no matter can be formed or destroyed, as transferred.
Thus, the amount of reactants and products in a chemical reaction is calculated by the law of mass of conservation.
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Write the number 4.92 x 10-3 from scientific notation to regular.
Please help?????
Explanation:
4.92*10-3=4.92/10^3=
4.92/1000=0.00492
Melting point for strontium ( Sr )
Answer:
the melting point is 1431 degrees f or 777.2 c
Answer:
1,431° Fahrenheit or 777° Celsius
What causes ions to form?
Answer:
Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the
Explanation:
hope this helps
Answer:
Ion, any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations; negatively charged ions, anions. Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms.
Explanation:
Examples of these processes include the reaction of a sodium atom with a chlorine atom to form a sodium cation and a chloride anion; the addition of a hydrogen cation to an ammonia molecule to form an ammonium cation; and the dissociation of a water molecule to form a hydrogen cation and a hydroxide anion.
What kinds of things are made up of cells?
Answer:
every living thing
Explanation:
its right
Answer:
Everything is made up of cells
Explanation:
Humans, animals, plants, etc.
the ions in KCL interact with water through what attractive force?
Answer:
electrostatic forces of attraction
What is responsible for the larger size of an anion in comparison with the atom from which it is form?
Answer:
electron-electron repulsion
Explanation:
When electrons add into valence shell of neutral elements, the element assumes a negative oxidation state. With this, the number of electrons having (-) charges will be larger than the number of protons having positive (+) charges. As a result, the extra electrons repel one another (i.e., like charges repel) and a larger radius is the result.
In contrast, when cations are formed, electrons are removed from the valence level (oxidation) producing an element having a greater number of protons than electrons. The larger number of protons will function to attract the electron cloud with a greater force that results in a contraction of atomic radius and a smaller spherical volume than the neutral unionized element.
To visualize, see attached chart that shows atomic and ionic radii before and after ionization of the elements.
what is also called vapor?
Answer:
Another word for vapor is gas.
Answer:
Another name for vapour is gas
Nuclear power doesn't directly emit greenhouse gases, but it does leave behind dangerous nuclear _______.
Answer:
Waste.
Explanation:
"A major environmental concern related to nuclear power is the creation of radioactive wastes such as uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes. These materials can remain radioactive and dangerous to human health for thousands of years. Radioactive wastes are subject to special regulations that govern their handling, transportation, storage, and disposal to protect human health and the environment. The U.S. Nuclear Regulatory Commission (NRC) regulates the operation of nuclear power plants."
