Answer:
Factories because they have helped with producing goods faster but in the meanwhile, our future will slowly get warmer.
Explanation:
Which statement is correct for the element of proton number 19?
A It is a gas that dissolves in water
B It is a hard metal that is not very reactive with water
C It is a non-metal that burns quickly
D It is a soft metal that is highly reactive with water
Answer:
D
Explanation:
From periodic table : proton number 19 corresponds to K (potassium)
which is very reactive with water
what force of attraction holds ionic compounds together
Answer:
electrostatic force
Explanation:
The same elements may combine in different ratios to form the same compound?
Answer:
law of multiple proportion
Explanation:
Determine the oxidation number if each atom in the following compunds: sodium chloride and iron(||) oxide.
Explanation:
see the picture for the answer
1. Once tissue fluid enters the lymphatic capillaries, it is called what?
Lymph
Ducts
Organs
Nodes
1.2 x 10-3 M in ph and is a acid or a base
Answer:
base
Explanation:
bases have a phone scale more than 7
Which of the following, in the solid state, would be an example of a metallic crystal?
1. carbon dioxide
2. barium fluoride
3. diamond
4. iron
5. None of these
What element do all carbonate materials contain
Answer:
All carbonates contain one carbon atom bonded to three oxygen atoms. Carbonates may include other elements. A few are calcium, iron, and copper. Carbonate minerals are often found where seas once covered the land.
Which of the following is the lowest temperature?
O 330 K
O 48°C
O 64°F
how many liters of water are needed to prepare 756 g of CaCO3 for a 3.50 M solution? MM=100.1 grams/mole
The volume of water needed to prepare the solution given the data is 2.16 L
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of CaCO₃Mass of CaCO₃ = 756 g Molar mass of CaCO₃ = 100.1 g/mol Mole of CaCO₃ =?Mole = mass / molar mass
Mole of CaCO₃ = 756 / 100.1
Mole of CaCO₃ = 7.55 moles
How to determine the volume Mole of CaCO₃ = 7.55 molesMolarity = 3.5 MVolume = ?Volume = mole / molarity
Volume = 7.55 / 3.5
Volume = 2.16 L
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Write a conversion factor that converts between moles of calcium ions in calcium phosphide, Ca3P2, and moles of Ca3P2.
The conversion factor between moles of calcium ion and moles of [tex]Ca_3P_2[/tex] in [tex]Ca_3P_2[/tex] would be 3 to 1.
Mole fraction[tex]Ca_3P_2[/tex] if formed from 3 carbon atoms and 3 phosphate atoms according to the equation:
[tex]3Ca + 2P --- > Ca_3P_2[/tex]
Thus, there are 3 moles of calcium in every 1 mole of [tex]Ca_3P_2[/tex].
The conversion factor between moles of calcium and moles of [tex]Ca_3P_2[/tex] will. therefore, be 3 to 1 or simply 3:1.
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Please answer this correctly!
A group of college students travel from Florida to Rome, Italy, on spring break. Which type of travel are they participating in?
A. Domestic
B. International
C. Local
D. Sustainable
Answer:
International is the answer duh
2.0 moles of H3PO4 equals how many atoms of O
Considering the definition of compound, chemical formula and Avogadro's Number, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.
What is compound and chemical formulaIn a compound there are atoms of different elements joined by forces that we call chemical bonds.
The chemical formula indicates the number and type of different atoms present in the molecule.
Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Atoms of OIn this case, in 1 mole of the compound H₃PO₄ you have:
3 moles of H.1 mol of P.4 moles of O.Then, in 2 moles of H₃PO₄ you have 8 moles of O.
Now, you can apply the following rule of three: if by definition of Avogadro's number 1 mole of oxygen contains 6.023×10²³ atoms, 8 moles of oxygen contains how many oxygen atoms?
[tex]number of atoms=\frac{8 molesx6.023x10^{23}atoms }{1 mole}[/tex]
number of atoms= 4.8184×10²⁴ atoms
Finally, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.
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Please help!!!!!!
The graph shows the change in concentration of one of the species in the reaction
A + B + C→D + E.
If the graph indicates the reaction rate, then the concentration of which species is plotted?
A
B
C
E
Answer:
E.
Explanation:
Look at change in concentration over time...is it increasing or decreasing? It is increasing right as you can see because it starts at 0 then increases and plataeus. What increases in a reaction, reactant or product? Products increase right cuz your reactants react with each other to make prodcuts.
At start of reaction you have no products (zero) thus this graph starts at 0. At end you have alot of product thus over time the concentration of product increases.
ABC are reactants their concentration should decrease over time
DE are products, they should increase as reaction goes on.
Task
Determining Heat Gain and Loss
In this activity, you’ll heat an object in hot water and then transfer it to cool water. The object will become cooler, and the cool water will become warmer. Based on the temperature changes, you’ll calculate and compare the heat lost by the object and the heat gained by the water. To begin, choose an object (or objects) made of a known material and that can be immersed in water without causing damage.
Before you begin this task, read these lab safety guidelines. If you’re using an electronic balance, watch this video about measuring mass.
Estimated time to complete: 1 hour
If you’re using an Edmentum lab kit, remove the electronic balance and thermometer from the kit. These materials are italicized in the following equipment list. Then gather any additional items shown in the list. If you’re not using an Edmentum lab kit, alternatives are suggested in parentheses. If you don't have these alternative materials at home, please check with your teacher for help.
You’ll need these materials:
electronic balance (may also use a kitchen scale, readable at least to the nearest gram)
thermometer, readable at least to the nearest degree from 0°C to 100°C (32°F to 212°F)—readings to the nearest tenth of a degree will produce better results
foam cups (2)
lids to fit the cups (may use squares of cardboard as lids)
solid object (or group of objects) of a known material that can fit easily in the cup, ideally having a total mass of 25 to 60 grams; here are some ideas:
2–5 plastic dominoes, depending on size
5–10 glass marbles, depending on size
10 quarters
tongs
pen or marker
stove, hot plate, or microwave oven
container for heating water (depends on the selected heat source)
Part A
Begin the task by performing these steps. Record your observations in the table provided.
Label the foam cups with the numbers 1 and 2.
Record the type (and quantity, if applicable) of object you will be using. Include what kind of material the object is made of.
Determine the specific heat capacity of the chosen object from this list of specific heat capacities. If you can’t locate your material on the list, do an online search.
Use the electronic balance to measure the mass of the chosen object(s). Record the mass. Then, place the object(s) into cup 1.
Answer:
The water warms to a temperature of 28.1°C. Determine the specific heat capacity of the zinc. Now this 229.9 J is equal to the -Qmetal. The specific heat capacity of the metal can be calculated by setting -229.9 J equal to m•C•ΔT.
...
Heat and Changes of State.
Explanation:
If the volume of an air pump used to inflate a football decreases from 480 mL to 375 mL, and the original
pressure was 93.5 kPa, what is the new air pressure in the pump if the temperature stays constant?
Answer
Explanation:
P1=93.5 kPa V1=480 mL P2=? V2=375 mL
HPO42- is an amphoteric ion. Is the Ka or Kb for this ion larger? (Hint: Consider
what its conjugate acid and conjugate base are in calculating the constants.)
Would you expect it to behave more like an acid or a base?
Sibce its Kb is larger than its Ka, the monohydrogen phosphate ion, HPO4^2- will behave more as a base than as an acid.
What is an amphoteric ion?An amphoteric ion is an ion that can act both as an acid or a base.
An example of an amphoteric ion is monohydrogen phosphate ion,
[tex]HPO_4^{2-}[/tex]
The Ka of monohydrogen phosphate ion is 4.8 × 10^-13 while the Kb is 1.6 × 10^-7.
The In is greater than the Ka.
Therefore, the monohydrogen phosphate ion, HPO4^2- will behave more as a base than an acid.
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DIRECTIONS: Solve the following problems by using G.R.E.S.A (Given, Required,Equation, Solution, and Answer).
1. At constant temperature, the volume of a gas was found to be 500cm³ at a pressure of 760mmHg. If the pressure of the gas is doubled what will be the new volume of the gas?
Answer:
SEE BELOW
Explanation:
Given 500 cm^3 = V1 760 mm = P1 (760*2) = P2
Required V2
P1V1 = P2V2
RE-ARRANGE TO P1V1/P2 = V2
(760)(500) /(760*2) = V2
V2 = 250 ML
According to Boyles law
[tex]\\ \rm\Rrightarrow P\propto \dfrac{1}{v}[/tex]
So if pressure is increased volume will be decreased and vice versaNow pressure is doubled means multiplied by 2
The volume will be divided by two of get halved .
New volume
500/2250cm³Name the following branched alkanes. Two of these are isomers of each other, put a star ★ in their boxes.
Answer:
square boxes
✪
Explanation:
if you like my answer
Plate Boundaries and Movement report
Which of the following is made of tissues and is part of an organ system?
The heart is made of tissues and is part of an organ system.
What is a tissue?Tissue is a group of cells that have a similar structure and that function together as a unit.
The cardiovascular system is the system responsible for delivering blood to different parts of the body.
It consists of the following organs and tissues: The heart: A muscular pump that forces the blood around the body.
Hence, heart is made of tissues and is part of an organ system.
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Net ionic equation for Calcium hydroxide reacting with ammonium Chloride?
Answer:
Ca(OH)₂ (aq) + 2NH₄Cl (aq) → CaCl₂ (aq) + 2NH₃ (g) + 2H₂O (l)
Ca²⁺ + 2OH⁻ + 2NH₄⁺ + 2Cl⁻ → Ca⁺² + 2Cl⁻ + 2NH₃ (g) + 2H₂O (l)
2OH⁻ + 2NH₄⁺ → 2NH₃ (g) + 2H₂O (l)
Explanation:
ca (OH)2 + 2NH4CL------> CACL2 + 2NH3 + 2H2O
What is a standard solution?
Answer:
A standard solution is any chemical solution which has a precisely known concentration.
Sodium Chloride for example.
Explanation:
Answer:
A standard solution is solution containing precisely known concentration of an element or a substance
will favor dissolution and
will favor crystallization in a saturated solution of table sugar.
a. cooling, heating
b. heating, cooling
C. evaporation, heating
d. cooling, evaporation
Answer:
b) heating, cooling
Explanation:
Heating will favour dissolution (it helps dissolving faster).
Cooling helps in crystallization.
Chem help!! I know the answer is 8 but why?
Answer:
Explanation:
It's simple train track method of cancelling out units.
If we read the balanced equation as this: 2 dm3 of octane reacts to form 16 dm3 of CO2 then how much CO2 is produced by 1 dm3?
Would you agree that it would be half of 16?
[tex]\frac{2dm3}{16 CO2} = \frac{1dm3}{?CO2}[/tex]
Cross multiply and solve for ?, you get 8.
For the reaction
2 HCl + Na2CO3 → 2 NaCl + H2O + CO2
179.2 liters of CO2 is collected at STP. How
many moles of NaCl are also formed?
Answer:
16 mol NaCl.
Explanation:
Do the train track method to cancel out all the units except moles of NaCl on top. Remember one mole of any gas occupies 22.4 L at STP.
179.2 L CO2 x 1 mol CO2/22.4 L CO2 x 2 mol NaCl/1 mol CO2
= 16 mol NaCl
what are the characteristics of binding energy
Explanation:
binding energy, amount of energy required to separate a particle from a system of particles or to disperse all the particles of the system. Binding energy is especially applicable to subatomic particles in atomic nuclei, to electrons bound to nuclei in atoms, and to atoms and ions bound together in crystals.
I need help with this i need help by sb
Answer:
30N to the left.
Explanation:
There is no net vertical force as the 45N force upwards and the 45N force downwards cancel each other out.
Horizontally, the resultant force is the 30N to the left as the 45N force to the left is in opposite direction to the 15N force to the right, so they are subtracted:
45N - 15N = 30N
Hope this helps!
Help please I really don’t understand
elenium dichloride, SeCl2, has a molar mass of 149.86 g/mol. What is the mass in grams of 0.195 moles of SeCl2? Use the common abbreviation for the units.
Selenium chloride has a molar mass of 149.86 g/mol. The mass of selenium dichloride in grams is 29.22 grams.
What is mass?
Mass is the quantity of matter of a physical body.
The molar mass is given 149.86 g/mol
The number of moles is 0.195
By the formula of molar mass
[tex]\rm Molar\;mass = \dfrac{mass}{number\;of\;moles} \\\\\rm mass = molar mass \times number\;of\;moles\\\rm mass =149.86 \times 0.195 = 29.22 g[/tex]
Thus, the mass of selenium dichloride in grams is 29.22 grams.
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