Which sample is a pure substance? zinc oxide sugar dissolved in water pond water soil
Answer:
Its (A) zinc oxide
Explanation:
just took the quiz
Among the given option, Zinc Oxide is a Pure substance.
What is Pure Substance ?A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen.
A pure substance does not have to be of a single element or compound.
Hence, Among the given option, Zinc Oxide is a Pure substance.
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How many formula units are in 9.3 g of alumina (Al2O3)?
Answer in units of formula units.
Answer:
5.5 × 10²² formula units Al₂O₃
General Formulas and Concepts:
Chemistry - Stoichiometry
Reading a Periodic TableDimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
9.3 g Al₂O₃
Step 2: Define conversions
Avogadro's Number
Molar Mass of Al - 26.98 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Al₂O₃ - 2(26.98) + 3(16.00) = 101.96 g/mol
Step 3: Convert
[tex]9.3 \ g \ Al_2O_3(\frac{1 \ mol \ Al_2O_3}{101.96 \ g \ Al_2O_3} )(\frac{6.022 \cdot 10^{23} \ formula \ units \ Al_2O_3}{1 \ mol \ Al_2O_3} )[/tex] = 5.4928 × 10²² formula units Al₂O₃
Step 4: Check
We are given 2 sig figs. Follow sig fig rules.
5.4928 × 10²² formula units Al₂O₃ ≈ 5.5 × 10²² formula units Al₂O₃
Silver is mainly recovered as a byproduct of the bulk mining of other metals such as copper, lead, zinc and gold. Where in the United States do you think silver recovery would happen?
Answer:
Explanation:
This question appear incomplete because of the absence of options. However, places where silver recovery would happen in the United States are states where huge mining of copper, lead, zinc or gold are been mined. Examples of such places include Arizona, California and Oregon; where copper (and some other metals in some cases like gold in Oregon) is heavily mined and silver is recovered as a byproduct.
When people run long distances, their muscles require increased amounts of oxygen. Which system is responsible for carrying this oxygen to the muscles?
1. Using what you know about the of molecules in a liquid, explain alcohol moves down a cooled thermometer.
2. The animation shows that the molecules spread out slightly when heated. Do you think the thermometer would work as well if the tube of red liquid were wider? Why or why not? Use evidence to support your answer.
Answer:
oss sees djjekejjddhiwiwjjxbuekes
Animals and humans obtain the energy they need from what?
A. food
B. water
C. carbon dioxide
D. photosynthesis
Answer:
A. Food
Explanation:
Water alone does not give energy, Carbon Dioxide cannot be consumed healthily, and photosynthesis is for plants.
Really need to get this test right so please help me answer this question.
Answer:
Mass
Explanation:
Answer:
strength
Explanation:
Fields allow some objects to exert forces on each other even when they are not ________.
Answer:
in contact
Explanation:
Fields allow some objects to exert force on each other even when they are not contact with one another.
The region of space where the effect of a force is felt is know as a field.
Field forces for provides a non-contact means of exerting forces. They objects do not have to be in contact before the force is felt. An example is the gravitational force field.Fields allow some objects to exert forces on each other even when they are not in contact .
I need help pleases and can you explain
Answer:butterflies
Explanation:
Nah man you are on your own.
Can somebody plz help answer all of these questions right it’s very important. If u can that will be amazing thanks!
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Answer:
1. Mechanical energy
2. Heat/thermal energy
3. Electrical energy
4. Heat energy
5. Electrical energy
Explanation:
Hope this helped!
What would happen to a plant if you grew it in a room without cabon dioxide
Answer:
One of the byproducts of respiration is CO2, this is the opposite of photosynthesis. It is not unusual for plants to stop taking in carbon dioxide to uptake small amounts of oxygen at night. In the event that plants cease to take up CO2 all together, they will cease to convert sunlight into carbohydrates, and die.17/01/2019
Explanation:
A baseball thrown into the air will continue on its path until which force acts upon it?
A. friction
B. gravity
C. inertia
D mass
Answer:
gravitational force exerted by the Earth, acts upon the baseball which is thrown into the air.
A baseball thrown into the air will continue on its path until a gravitational force acts upon it.
What is gravitational force?The force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface.
When a ball is thrown up the motion of the ball is away from the earth and the gravitational force of the ball is towards the earth. So, the gravitational force of the ball is opposite to the direction of motion.
Hence, a baseball thrown into the air will continue on its path until a gravitational force acts upon it.
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What are the signs of a chemical reaction?
A. Color change and gas released
B. Color, Gas, Explosion, Smoke,
Precipitate
C. Color, Gas, Light, Temperature, Precipitate
Answer:
C
Explanation:
Because i just had to do this on my assignment and got 100
Answer:
hey , its option c because in chemical reaction colour + evolution of gas takes place + temp. + precipitation. but also light can come in the case of chemical reaction.
How many total oxygen atoms are in 2Ba(NO3)2
Answer:
6
Explanation:
Need Help ! ASAP !! Please
Answer:
Option 1.
Explanation:
3.6cm * 1inch/2.54 cm = 1.417 inch
which option is an element air, sodium chloride, oxygen,water
Answer:
oxygen
Explanation:
air is a way of saying oxygen but it isn't direct, sodium chloride is a combination of two different elements but isn't one element, and water is H2O but that isn't an element on the periodic table. The only real element that is on the periodic table is oxygen.
Answer:
oxygen
Explanation:
i took the test
Determine the energy in joules of a photon whose frequency is 3.75 x 1017 Hz.
Plz help my grade and life depend on it
Answer:
The energy of photon is 24.86×10⁻¹⁷ J
Explanation:
Given data:
Frequency of photon = 3.75×10¹⁷ Hz
Energy of photon = ?
Solution:
Formula:
E = hf
h = planck's constant = 6.63×10⁻³⁴ Js
Now we will put the values in formula.
E = 6.63×10⁻³⁴ Js × 3.75×10¹⁷ Hz
Hz = s⁻¹
E = 24.86×10⁻¹⁷ J
Thus, the energy of photon is 24.86×10⁻¹⁷ J
The Mississippi River carries tons of tiny rock fragments called sediments into the Gulf of Mexico. What do you think will happen to these sediments after a few million years?
Answer:build up
Explanation:
Answer:
The sediments will be transformed into rock.
Explanation:
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Answer:
d..i think..he found plant cells
Explanation:
Answer:
Its D
Explanation:
The energy of a pendulum is recorded at different positions in the table below. Use the data in the table to determine the amount of kinetic energy the pendulum had at Position 2.
Answer:
46.5 J
Explanation:
I did it in stemscopes.
Is this Ionic, Covalent, or Metallic? *
Answer:
Ionic
General Formulas and Concepts:
Chemistry - Compounds
Ionic Bonds - Forming between a metal and nonmetalCovalent Bonds - Forming between 2 nonmetalsMetallic Bonds - Forming between 2 metalsExplanation:
Step 1: Define
MgI₂ - Magnesium Iodide
Step 2: Identify
Mg is an Alkaline Earth Metal
I is a Halogen Gas
Step 3: Confirm
Mg will transfer its 2 electrons to 2 separate I's and will form an Ionic bond.
Which cellular process produces simple sugars?
A. mitosis
B. photosynthesis
C. respiration
D. waste elimination
Answer:
The answer is C. Hope this helps you out!
Answer:
C. Respiration
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Which of the following is true about an atom of iron and an atom of copper?
They have different masses.
Both have the same properties.
They have an equal number of protons.
Both have different types of sub-atomic particles.
Answer:
They have different mass and Both have different types of sub-atomic partials
Explanation:
Answer:
D: They have different mass and Both have different types of sub-atomic partials
Explanation:
A chemical equation can be used to solve stoichiometry problems provided that it....
indicates only the forward reaction and not the reverse.
indicates that reactants are in the gas phase and are not solids or liquids.
includes the coefficients that are needed for balancing the equation.
includes the state of matter after each substance.
Answer:
includes the coefficients that are needed for balancing the equation.
Explanation:
A chemical equation can be used to solve stoichiometry problems provided that it includes the coefficients that are needed for balancing the equation.Hence, Option (C) is Correct.
What is Balanced Equation ?
An equation that has an equal number of atoms of each element on both sides of the equation is called a balanced chemical equation, i.e., the mass of the reactants is equal to the mass of the products.
Therefore, A chemical equation can be used to solve stoichiometry problems provided that it includes the coefficients that are needed for balancing the equation.Hence, Option (C) is Correct.
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What number should be placed
in the blank in order for this
equation to follow the Law of
Conservation of Mass?
57g + ? ---→ 34g +10g 26g
Answer:
13g
Explanation:
34+10+26=70
70-57=13
13g would complete the equation
Describe an atom formed by covalent bonding
Answer:
Water atoms
Explanation:
It's a mix of hydrogen and oxygen linked with covalent bonds.
Can someone please help and list what each type of thing they are? (Element, Compound, Mixture of elements, Mixture of compounds, Mixture of elements and compounds)
Is it possible that material from this sedimentary rock could ever form igneous rock
Answer:
Yes
Explanation:
It can melt into liquid rock and form igneous rock.
Answer:
Yes, the sedimentary rock can change into igneous rock by undergoing melting and then solidifying.
Explanation:
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Which area of the atom
contains the most mass, but
the least volume?
Answer:
It is nucleus.
Explanation:
As you see in pic in center you see protons and neutrons. And electrons are surrounding them.
The mass of proton and neutron us close together but electron has the less mass.