A car traveled a distance of 30 km in 20 seconds (1/3 hour). What was the speed of the car?
Answer:
90.1km/hr
Explanation:
Given parameters:
Distance = 30km
Time = 20s = 0.33hr
Unknown :
Speed of the car = ?
Solution:
To solve this problem;
Speed = [tex]\frac{distance }{time}[/tex]
Now insert the parameters and solve;
Speed = [tex]\frac{30}{0.333}[/tex] = 90.1km/hr
Use the periodic table to calculate the percent composition of hydrogen in hexane.
Hexane's chemical formula is CH14.
es )))
A)
16.3%
B)
36.0%
C)
37.5%
D)
83.7%
Answer:
A)16.3% (Hexane's formula is C6H14)
i dont know the answer pls help me
Answer:
Unicellular
Explanation:
Unicellular organisms are made up of only a single cell
What increases the salinity of the ocean surface water, causing it to sink
downward?
Help
Answer:
Thermohaline Circulation
Explanation:
The process is known as “Thermohaline Circulation”. In the Earth’s polar regions ocean water gets very cold, forming sea ice. As a consequence the surrounding seawater gets saltier, because when sea ice forms, the salt is left behind. As the seawater gets saltier, its density increases, and it starts to sink.
How many grams are in 2x10^24 formula Units of CaCO3
Answer:
332g
Explanation:
Given parameters:
Formula units = 2 x 10²⁴
Unknown:
Mass of the compound = ?
Solution:
The formula of the compound is:
CaCO₃
6.02 x 10²³ atoms are contained in 1 mole of a compound
2 x 10²⁴ atoms will be made up of [tex]\frac{2 x 10^{24} }{6.02 x 10^{23} }[/tex] = 3.32mole of CaCO₃
Mass of CaCO₃ = number of moles x molar mass
Molar mass of CaCO₃ = 40 + 12 + 3(16) = 100g/mol
Mass of CaCO₃ = 3.32 x 100 = 332g
A compound XO exists in nature. A scientist wanted to prepare the same compound in his lab based on the law of constant proportion but the formula of the compound that he prepared was found to be XO2. Which postulates of the law of constant proportion did he violate?
Answer:
The postulate that all pure samples of a particular chemical compound contain the same elements combined in the same proportion by mass.
Explanation:
The law of constant composition (or definite proportion) states that all pure samples of a particular chemical compound contain the same elements combined in the same proportion by mass.
This law implies that irrespective of the source of the sample of the compound or the method by which the sample was prepared, as long as the sample is pure, the elements present in the compound are always combined in a specific ratio by mass. For example, water has the molecular formula H₂O. Irrespective of the water source, for example, tap-water, lake, stream, river or rainfall, each pure sample of water will have the constant composition of 2 atoms of hydrogen to one atom of oxygen.
The given compound exists as XO in nature. Therefore, irrespective of the source or method of preparation, every sample of this compound should have the formula XO. Since the compound prepared by the scientist was XO₂, therefore, the postulate that all pure samples of a particular chemical compound contain the same elements combined in the same proportion by mass was violated by the scientist. The scientist must have prepared a different compound of the elemental compositions.
Which Atom experiences a greater shielding effect, Magnesium (Mg) or chlorine (CI)?
Answer:
To be stable, an atom or ion should have 8 electrons in the outer shell. This is called the octet rule.
Magnesium is unstable because a magnesium atom has 2 valance electrons in its 3rd shell.
Chlorine is unstable, because a chlorine atom has 7 valance electrons is its 3rd shell.
Chlorine has higher electronegativity than magnesium, so the 2 chlorine atoms will attract 2 electrons from a magnesium atom. This produces a +2 magnesium ion and two -1 chloride ions.
A) A Cl atom donates two electrons to a Mg atom
B) An Mg atom donates two electrons to a Cl atom.
C) A Cl atom donates one electron to each of the two Mg atoms.
D) An Mg atom donates one electron to each of the two Cl atoms. YES
Atoms do not donate any electrons. When a chlorine molecule collides with a magnesium atom, each of the chlorine atoms grab an electron from the outer shell of the magnesium atom. You might think that the magnesium atom would be angry at the chlorine molecule. But, the magnesium atom is much “happier” as a stable +2 ion than a neutral atom. And the chlorine molecule is also “happier” as two -1 chloride ions.
Magnesium chloride is the name for the chemical compounds with the formulas MgCl2 and its various hydrates MgCl2(H2O)x. These salts are typical ionic halides, being highly soluble in water. The hydrated magnesium chloride can be extracted from brine or sea water. Magnesium chloride as the natural mineral bischofite is also extracted (solution mining) out of ancient seabeds; for example, the Zechstein seabed in northwest Europe. Anhydrous magnesium chloride is the principal precursor to magnesium metal, which is produced on a large scale. Hydrated magnesium chloride is the form usually used in prescription oral magnesium supplements.
We are the ones who messed with mother nature. Magnesium chloride was very stable (happy) when it was in the sea water. Humans decided to harvest the MgCl2 and rip it apart to produce little strips of magnesium metal for chemistry class.
In nature, “nobody” freely donates anything to “anyone”. The electrostatic forces in the atoms decide who get the electons.
Sometimes, I just get carried away as I answer peoples’ question.
I hope this helped you.
How many grams of carbon dioxide are produced by the combustion of 2.5 moles of ethane gas, C 2 H 6 at standard conditions?
2 C 2 H 6 (g)+7 O 2 (g) 4 CO 2 (g)+6 H 2 O (g)
Answer:
220g
Explanation:
The reaction equation is given as:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
Number of moles of ethane gas = 2.5moles
To find the mass of CO₂ produced, we need to know the number of moles of the compound produced;
2 mole of ethane gas produced 4 moles of CO₂
2.5 moles of ethane gas will produce [tex]\frac{2.5 x 4}{2}[/tex] = 5mole of CO₂
So;
Mass of CO₂ = number of moles x molar mass
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Mass of CO₂ = 5 x 44 = 220g
Which products would form if chlorine gas was bubbled through a solution of sodium bromide?
a. Na and BrCl
b. Na snd BrCl2
c. Na and Br2
d. Na(cl)2 and Br2
Answer:
NaCl and Br2
Explanation:
Edge 2020
Answer:
The Answer is C: Na and Br3
Explanation:
yo someone wanna answer this?
Answer:
(1) Releases Energy
Explanation:
In the process called cellular respiration, energy is released from oxygen molecules.
Hope this helps! \ (•◡•) /
is reacts with acid a chemical or physical property? (WORTH 30 Points.)
Answer:
Metals in general have they chemical property of reacting with an acid. Zinc reacts with hydrochloric acid to produce hydrogen gas. This is a chemical property. Chemical change results in one or more substances of entirely different composition from the original substances.
Metal reacts with acid is a chemical property.
Metals react with acids which causes the production of salt and hydrogen gas is released. This is a chemical property because the reactions of reactant produces new type of products which is totally change from the parent material or reactants. The chemical property is refers to change of one type of matter into another type so we can conclude that reaction of metals with acid is a chemical property.
Learn more: https://brainly.com/question/20677720
List 3 different sugars found in this product. *
3 points
INGREDIENTS / INGRÉDIENTS :
CORN MEAL, SUGAR, CORN BRAN, CORN SYRUP,
MALTODEXTRIN, FANCY MOLASSES, SALT, WHOLE OAT FLOUR.
BAKING SODA, NATURAL FLAVOUR, COLOUR (CAROTENE),
VITAMINS AND MINERALS: IRON, ZINC OXIDE, NIACINAMIDE,
d-CALCIUM PANTOTHENATE, THIAMINE HYDROCHLORIDE,
CHOLECALCIFEROL (VITAMIN D3), PYRIDOXINE
HYDROCHLORIDE, FOLIC ACID.
CONTAINS OAT INGREDIENTS. MAY CONTAIN SOY.
SEMOULE DE MAÏS, SUCRE, SON DE MAÏS, SIROP DE MAÏS,
MALTODEXTRINE, MÉLASSE QUALITÉ FANTAISIE, SEL, FARINE
D'AVOINE ENTIÈRE, BICARBONATE DE SODIUM, ARÔME
NATUREL, COLORANT (CAROTENE),
VITAMINES ET MINÉRAUX : FER, OXYDE DE ZINC,
NIACINAMIDE, d-PANTOTHÉNATE DE CALCIUM,
CHLORHYDRATE DE THIAMINE, CHOLÉCALCIFÉROL (VITAMINE
D3), CHLORHYDRATE DE PYRIDOXINE, ACIDE FOLIQUE,
CONTIENT DES INGRÉDIENTS DE L'AVOINE. PEUT CONTENIR DU SOYA.
Answer:
Sugar (Sucrose), Corn Syrup (Glucose), Molasses (C6H12NNaO3S)
Explanation:
Each of these is a sweetener.
Density is defined by the equation d = m/v. Calculate the density of the wooden block, the rock, and the water by dividing the mass of each object by its volume.
Answer:
Density, d = 8.92 g/mL
Explanation:
Let mass of the wooden block, m = 46.83 g
The volume of the object, V = 5.25 mL
We need to find the density of the wooden block. The density of an object is given by its mass per unit volume.
density = mass/volume
[tex]d=\dfrac{46.83\ g}{5.25\ mL}\\\\=8.92\ g/mL[/tex]
So, the density of the wooden block is 8.92 g/mL.
Answer:
0.495 g/cm3
Explanation:
4 Explain why some acids are safe to consume
while others are not.
Answer:
Household cleaners, antiseptics and battery juice are examples of toxic chemicals that you cannot consume because they have high acids concentrations. However some are very healthy such as critic acids found in oranges. :) Hope this helped.
For fish to survive in your aquarium, you need to have a saturated solution of oxygen in the water. Suppose your aquarium holds 250L of water. How many grams of oxygen do you need to pump into the tank?
Answer:
The mass of oxygen needed to be pumped in the aquarium is 10 g
Explanation:
Here the value of the degree of solubility of oxygen in water is sought
The solubility of oxygen in fresh water is approximately 1.22 × 10⁻³ mol·dm⁻³ which is equivalent to approximately 40 mg/L
The volume of water the aquarium holds = 250 L
The mass of oxygen required = The solubility of oxygen in water × (The volume of water in the aquarium)
Therefore, the mass of oxygen needed to be pumped in the aquarium = 40 mg/L × 250 L = 10,000 mg
1,000 mg = 1 g
∴ 10,000 mg = 10 g
The mass of oxygen needed to be pumped in the aquarium = 10,000 mg = 10 g.
7. A 10.0 cm3 sample of copper has a mass of 89.6 g. What is the density of copper?
Answer:
d = 8.96 g/cm³
Explanation:
Given data:
Volume of sample = 10.0 cm³
Mass of copper = 89.6 g
Density of copper = ?
Solution:
Formula:
d = m/v
d = density
m = mass
v = volume
by putting values,
d = 89.6 g/ 10.0 cm³
d = 8.96 g/cm³
what is the molar mass of just the O in CO2?
Answer:
16 g/mol
Explanation:
In CO2, it means we have 1 mole of carbon and 2 moles of oxygen.
However, we want to find the molar mass of just a single mole of oxygen.
Now, from tables of values of elements in electronic configuration, the molar mass of oxygen is usually approximately 16 g/mol.
In essence the molar mass is simply the atomic mass in g/mol
According to your investigation in part A, how do strong acids differ from weak acids? Select all the correct answers. Strong acids contain more A− than weak acids do. Strong acids contain more H3O+ than weak acids do. Strong acids contain more HA than weak acids do. Strong acids contain more OH− than weak acids do.
Answer:
Strong acids contain more A− than weak acids do.
Strong acids contain more H3O+ than weak acids do
Explanation:
When we talk about a strong acid, we are referring to any acid that is completely dissociated or ionized when it is in an aqueous solution.
It is very eager to lose a proton, H+ in solution according Arrhenius definition.
In aqueous solution, a strong acid ionizes as follows:
HA(aq) + H2O → H3O+(aq) + A−(aq)
Since, strong acids ionize completely in solution, strong acids contain a greater H3O+ and A− concentration than solutions of weak acids.
Answer:
A. Strong acids contain more A− than weak acids do.
B. Strong acids contain more H3O+ than weak acids do.
D. Strong acids contain more OH− than weak acids do.
Explanation:
Plato correct
A cube has a mass of 42 grams and a volume of 15 cubic centimeters. What is it’s density?
(Show your work or complete all problems for brainliest)
Answer:
2.8g/cm³
Explanation:
Given parameters:
Mass of cube = 42g
Volume of cube = 15cm³
Unknown:
Density of the cube = ?
Solution:
Density is defined as the mass per unit volume of a substance. It is mathematically expressed as:
Density = [tex]\frac{mass}{volume}[/tex]
So;
Density = [tex]\frac{42}{15}[/tex] = 2.8g/cm³
0.2 moles of aluminum has a mass of 5.4 g. what is The molar mass of aluminum
Answer:
Molar mass = 27 g/mol
Explanation:
Given data;
Number of moles of Al = 0.2 mol
Mass of Al = 5.4 g
Molar mass of Al = ?
Solution:
Formula:
Number of moles = mass/molar mass
By putting values,
0.2 mol = 5.4 g/ molar mass
Molar mass = 5.4 g/ 0.2 mol
Molar mass = 27 g/mol
Describe the difference
between the smooth
Endoplasmic Reticulum
(ER) and rough
Endoplasmic Reticulum
(ER)
Answer:
Smooth endoplasmic reticulum (SER) is a type of endoplasmic reticulum consisting of tubular vesicles that lack ribosomes on the outer surface and is involved in the synthesis and storage of lipids. Rough ER has ribosomes on the outer surface. Smooth ER does have riboszomes on the outer surface.
Explanation:
Which combination of elements produce compounds with a large electronegativity difference and high conductivity?
Answer:
C. H2(g)
Explanation:
Which statement best describes the density of an atom's nucleus?
A The nucleus occupies most of the atom's volume but contains little of its mass,
The nucleus occupies very little of the ston's volume and contains little of its mass.
The nucleus occupies most of the stom's volume and contains most of its mass
The nucleus occupies very little of the ston's volume but contains most of its mass
Answer:
D. The nucleus occupies very little of the volume but contains most of its mass
Explanation:
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the nucleus occupies very little of the volume but contains most of its mass. The correct option is option D.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of an atom's nucleus ÷volume marked on the graduated cylinder
Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. The nucleus occupies very little of the volume but contains most of its mass.
Therefore, the nucleus occupies very little of the volume but contains most of its mass. The correct option is option D.
To know more about density, here:
https://brainly.com/question/16894337
#SPJ2
There is a container with an unknown chemical. The container says that there is 1 mole
of the chemical inside, but the name of the chemical is unreadable. The label states
that the mass of the chemical inside is 28g and that the chemical is diatomic. After
pulling out your periodic table, you determine that the unknown chemical is...
The unknown chemical : Nitrogen gas : N₂
Further explanationGiven
1 mole of the unknown chemical
mass = 28 g
Required
The unknown chemical
Solution
A mole is a number of particles(atoms, molecules, ions) in a substance
This refers to the atomic total of the 12 gr C-12 which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles
Can be formulated :
mol = mass : molecular weight
Molecular weight(MW) = mass : mol
MW=28 g : 1 mol
MW= 28 g/mol
Because this compound is diatomic, it consists of 2 elements of the same type, so this element has a mass number:
28: 2 = 14
The element having the mass number 14 is N
a. 24 m x 3.26 m
b. 120 m x 0.10 m
c. 1.23 m x 2.0 m
d. 53.0 m x 1.53 m
PLEASE SHOW WORK
round answers with correct significant figure.
Answer: a) [tex]78.2m^2[/tex]
b) [tex]1.2\times 10m^2[/tex]
c) [tex]2.5m^2[/tex]
d) [tex]81.1m^2[/tex]
Explanation:
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
Rules for significant figures:
1. Digits from 1 to 9 are always significant and have infinite number of significant figures.
2. All non-zero numbers are always significant.
3. All zero’s between integers are always significant.
4. All zero’s preceding the first integers are never significant.
5. All zero’s after the decimal point are always significant.
The rule apply for the multiplication is :
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
a) [tex]24m\times 3.26m=78.2m^2[/tex]
b) [tex]120m\times 0.10m=1.2\times 10m^2[/tex]
c) [tex]1.23m\times 2.0m=2.5m^2[/tex]
d) [tex]53.0m\times 1.53m=81.1m^2[/tex]
what do you mean by calcination??
Answer:
Calcination refers to heating a solid to high temperatures in absence of air or oxygen, generally for the purpose of removing impurities or volatile substances.
Explanation:
hope it helps
please help!! I’m really confused because it’s actually supposed to be called occluded front but the definition is true.
Describe four ways by which organisms reproduce asexually
Answer: thay can't make cells
Explanation:
concept of mole chemistry question
Answer:
How many molecules of water are there in 54 g of H2O H 2 O ? Solution. Molar Mass of H2O H 2 O = 2 + 16 = 18 g/moles. So ,number of moles of H2O H 2 O = Mass/Molar Mass = 54/18 =3 moles. Now 1 moles = 6.022×1023 6.022 × 10 23 molecule.
Why do scientist use the scientific method
Answer:
B
Explanation:
scientists always look for evidence
Answer:
Yea its B
Explanation: The person above me legit toke the answer out of my mouth