Answer:
yes it is a chemical change
Explanation:
because first it was in liquid and turned into gas
Answer:
It's a chemical reaction
Hypothesis: This is your testable statement. Usually an "If, then"
statement.
Fill in the blank using what you know about cell structures. Only put
one structure.
If the cell has
____, then it is a plant cell.
A volume of 2.15 mL of Oxygen was collected in the lab at a temperature of 17 °C and 740.2 mmHg. After a day, the volume of the gas has become 2.21 mL and the barometer reading (for air pressure) had not changed. What is the new temperature in the lab
(in °C)?
The new temperature (T₂) in the lab = 25.09 °C
Further explanationGiven
V₁=2.15 ml
T₁ = 17 + 273 = 290 K
P = 740.2 mmHg
V₂ = 2.21 ml
Required
The new temperature (T₂)
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Input the value :
T₂=(T₁.V₂)/V₁
T₂=(290 K x 2.21 ml)/2.15 ml
T₂=298.09 K = 25.09 °C
ANAGRAM: Rearrange the scrambled letters to form the correct word. Refer to the meaning of each word as your clue.Your answers should be in CAPITAL LETTERS ONLY
1. _ _ _ _
2. _ _ _ _ _
3. _ _ _ _ _ _ _
4. _ _ _ _ _ _ _ _
Which of the following is a unit of time?
km
hr
km/hr
mi
Answer:
hr
Explanation:
because it's short for hour
HELPPP ASAPPPPP I WILL GIVE BRAINLIEST
Ocean currents contribute to global climates and occur due to differences in temperature, salinity, and density. WHY do you THINK these differences can cause currents to form?
Answer:
Its changes over time.
Explanation:
I think because each ocean current has a different temperature.
Answer:
Thermohaline circulation. This is a process driven by density differences in water due to temperature (thermo) and salinity variations in different parts of the ocean. Currents driven by thermohaline circulation occur at both deep and shallow ocean levels and move much slower than tidal or surface currents.
ASAP question also in pic will get Brainiest
What is the force of an egg that is thrown at a brick wall if the egg has a mass of .03 kg and an acceleration of 50 m/s/s
Use the formula F=ma ( dont forget the units )
Answer:
F=ma
=(0.3kg) (50m/s/s)
F =15 kg per m/s/s
Please help with Chemistry! Very urgent! I’ll give you 40 points
Answer: 3. No displacement, zinc is most reactive.
4. Calcium Chloride, Calcium is most reactive.
5. No displacement, Copper is most reactive
6. No displacement, Calcium is most reactive
7. Hydrogen Oxide, Hydrogen is most reactive
8. Carbon oxide, Carbon is most reactive
9. No displacement, Aluminum is most reactive
10. Potassium Kryptide + Lead, no displacement, Potassium is most reactive.
Photosynthesis is the process in which plants use sunlight to convert water and carbon dioxide into glucose and oxygen. Which of these statements explains why photosynthesis is a chemical change?
A New substances are formed with properties that are different from the original substances.
B New substances are formed but their properties are the same as the original substances.
C No new substance is formed but some of the properties change.
D No new substance is formed and the change is easily reversible. Which of the following images shows a chemical change?
Photosynthesis is a chemical change as:
A. New substances are formed with properties that are different from the original substances.
What is a Chemical Change?A chemical change happens when one chemical substance is transformed into one or more different substances. A chemical change is different from a physical change, which doesn't rearrange atoms or molecules and produce a completely new substance.
Thus, correct option is A which proves that photosynthesis is a chemical change.
Find more information about Chemical change here: brainly.com/question/453535
what pair of elements will react more violently
a chlorine and lithium
b chlorine amd potassium
c iodine and lithium
d iodine and potassium
Answer:
chlorine and potassium
Explanation:
Answer:
Chlorine and potassium
HELP ASAP when SrCl2 + Li3PO4 --> Sr3(PO4)2 + Licl is correctly blnced, the coefficient in front of the Licl will be a
O 1
o 2
03
06
Consider the properties of ionic and covalent compounds. Why do you think ionic compounds form crystals and covalent compounds form molecules?
Please help!
Magnesium Sulphate can be made from magnesium and dilute sulfuric acid. Mg + H2SO4 -> MgSO4 + H2. calculate the mass of magnesium sulfate that would be obtained from 4G of magnesium.
Answer:
20 g of MgSO₄.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Mg + H₂SO₄ —> MgSO₄ + H₂
Next, we shall determine the mass of Mg that reacted and the mass of MgSO₄ produced from the balanced equation. This is illustrated below:
Molar mass of Mg = 24 g/mol
Mass of Mg from the balanced equation = 1 × 24 = 24 g
Molar mass of MgSO₄ = 24 + 32 + (16×4)
= 24 + 32 + 64
= 120 g/mol
Mass of MgSO₄ from the balanced equation = 1 × 120 = 120 g
SUMMARY:
From the balanced equation above,
24 g of Mg reacted to produce 120 g of MgSO₄.
Finally, we shall determine the mass of MgSO₄ produced by the reaction of 4 g of Mg. This can be obtained as follow:
From the balanced equation above,
24 g of Mg reacted to produce 120 g of MgSO₄.
Therefore, 4 g of Mg will react to produce = (4 × 120)/24 = 20 g of MgSO₄.
Thus, 20 g of MgSO₄ is obtained from the reaction.
what information that can be obtained from solubility curve.write in 4 point
Answer:
The solubility curve helps us to predict which substance will crystallize out first from a solution containing two or more solutes.
The solubility curve helps us to compare the solubilities of different substances at the same temperature.
Solubility curve can be used to determine the amount of substance deposited when the solution is cooled.
It brings the change in the solute composition substance.
Answer:
1, we can know the solubility curve of substances.
2, we can compare the solubility curve of two or more substances in same temperature.
3, we can know the amount of solute and solvent which is used that solubility.
4, we can know that solubility of substances changes with temperature.
How many molecules are in the substance formula of 2C6H1206 (use coefficients)
Please help ASAP.
Answer: The number of formula units present in 2 moles of [tex]C_6H_{12}O_6[/tex] are [tex]1.2044\times 10^{24}[/tex]
Explanation:
Formula units are defined as the number of molecules or atoms present in 1 mole of a compound or element respectively.
According to mole concept:
1 mole of a compound contains [tex]6.022\times 10^{23}[/tex] number of formula units
Here, 2 represents the number of moles of [tex]C_6H_{12}O_6[/tex]
We are given:
Moles of [tex]C_6H_{12}O_6[/tex] (glucose) = 2 moles
Number of formula units of [tex]C_6H_{12}O_6=(2\times 6.022\times 10^{23})=1.2044\times 10^{24}[/tex]
Hence, the number of formula units present in 2 moles of [tex]C_6H_{12}O_6[/tex] are [tex]1.2044\times 10^{24}[/tex]
3. Which of the following items is representative of a homogeneous
mixture?
2 points
A. spaghetti & meatballs
B. cheeseburger
C. white bread dough
D. smoothie
E. Both A and B
O F. Both C and D
4. Which of the following is a chemical property of matter?
Answer: F. both c and d
Explanation:
homogeneous mixture is of same kind/phase. so the most appropriate answer we can take is smoothie and white bread dough :)
write a short notes on solubility product principle and its application?
What is one difference between Group 2 and Group 15 of the Periodic Table of Elements?
Answer:
Nitrogen group element, any of the chemical elements that constitute Group 15 (Va) of the periodic table. The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi), and moscovium (Mc)
Explanation:
2. Sodium-24 decays into Magnesium-24 by ernitting an electron (-e) from the
nucleus, What type of radiation does this process describe?
A. Alpha
B, Beta
C Gamma
D. X-ray
Answer:
In pretty sure it's B, Beta
Explanation:
Atomic Radius: Complete the following:
#of Atomic A) Which element has the smaller atomic radius?
Element
Protons Radius
B) Why do you think this element has a smaller radius? (how
Be
4
153
does the number of protons affect atomic radius?)
F
147
lonization Energy: Complete the following:
Atomic
Element
1st lonization A) Which element has the smaller 1st ionization energy?
Radius Energy B) Why do you think this element has a smaller 1st ionization
He
energy? (how does atomic radius affect 1st ionization energy?)
Kr
Electronegativity: Complete the following:
# of
Element
Electroneg- A) Which element has the larger electronegativity?
Protons ativity
B) Why do you think this element has a larger electronegativity?
(how does # of protons affect electronegativity?)
Ga
Answer:
2 A): Fluorine
B): more protons, more force attraction less atomic radius
3A): Helium
B):it has small atomic radius
4 th question is not visible.....
Help , thank you !!
Answer:
radioactive
nonmetal
hydrogen
liquid
rarely (since they have a full valence electron shell)
inner transition
The equipment shown above is provided so that the student can determine the value of the molar heat of solution for calcium chloride (CaCl2). Knowing that the specific heat of solution is 4.18 J/(g°C), list the specific measurements that are required to be made during the experiment.
Answer:
1. Mass of CaCl2 salt in grams
2. Volume of water in calorimeter
3. Mass of water in calorimeter
4. Mass of salt and water solution
5. Initial temperature of water
6. Final temperature of water
7. Temperature difference or change
Explanation:
The amount of heat absorbed or released during a chemical reaction is measured by the process of calorimetry. A calorimeter is a device used for the heat measurements in calorimetry. It consists of an insulated vessel that prevents heat exchange with the environment. The quantity of heat absorbed or released by a chemical reaction is calculated using the following formula: Q = mc∆t
The molar heat of solution, ∆Hsoln, of a substance is the heat absorbed or released when one mole of the substance is dissolved in water. In determining the molar heat of solution of a salt, e.g. calcium chloride, the following measurements are required:
1. Mass of CaCl2 salt in grams
2. Volume of water in calorimeter
3. Mass of water in calorimeter
4. Mass of salt and water solution
5. Initial temperature of water
6. Final temperature of water
7. Temperature difference or change
Select the correct answer. Which notation is used to represent gamma decay?
Answer:
B.
Explanation:
What is a "siege machine"?
Answer:
A siege engine is a device that is designed to break or circumvent heavy castle doors, thick city walls and other fortifications in siege warfare. Some are immobile, constructed in place to attack enemy fortifications from a distance, while others have wheels to enable advancing up to the enemy fortification.
Explanation:
A gas was at STP. If the pressure increased to 3.5 atm, what would the new
temperature be?
Answer:
T₂ = 956.0 K
Explanation:
Given data:
Initial temperature = 273.15 K
Initial pressure = 1 atm
Final pressure = 3.5 atm
Final temperature = ?
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
1 atm / 273.15 K = 3.5 atm / T₂
T₂ = 3.5 atm ×273.15 K / 1 atm
T₂ = 956.0 atm. K / 1 atm
T₂ = 956.0 K
21) What is the volume (inL) of 3470 g of liquid glycerol, which has a density of 1.26 g/?
Answer:
V = 2.75 L
Explanation:
Given that,
Mass of liquid glycerol, m = 3470 g
The density of liquid glycerol, d = 1.26 g/cm³
We need to find the volume of liquid glycerol.
We know that,
Density=mass/volume
[tex]V=\dfrac{m}{d}\\\\V=\dfrac{3470\ g}{1.26\ g/cm^3}\\\\V=2753.96\ cm^3[/tex]
We know that, 1 cm³ = 0.001 L
V = 2.75 L
So, the volume of liquid glycerol is 2.75 L.
suppose the burner under the pan of boiling water is turned to a higher settings. how will this affect the temperature of the water in the pan?
Answer:
I would say that the temp would increase but the liquid would turn into a gas faster. You can always keep heating liquid until it turns into a gas and is no longer in the pan.
Can somebody help me with the last 2. Will mark brainliest
The chart shows the percentage of different elements in the human body. Which element is the most prevalent in the human body?
nitrogen
hydrogen
carbon
oxygen
Answer:
D : oxygen
Explanation:
i took the test <3 good luck
Answer:
its d
Explanation:
how to find how many atoms are in grams.
Explanation:
To calculate the number of atoms in a sample, divide its weight in grams by the amu atomic mass from the periodic table, then multiply the result by Avogadro's number: 6.02 x 10^23.
HELPP ME !!!! DUE NOW!!!!!!
Match each element to the number of electrons in its valence shell.
Match Term Definition
Chlorine (Cl) A) Seven
Neon (Ne) B) Eight
Phosphorus (P) C) Six
Sulfur (S) D) Five
Answer:
the answer is
a
b
d
c
Explanation:
hopeit help
The correct matches will be:
Chlorine (Cl) ⇒ SevenNeon (Ne) ⇒ EightPhosphorus (P) ⇒ fiveSulfur (S) ⇒ sixChlorine has an atomic number of 17 and its electronic configuration is given by:[tex][Cl]=1s^22s^22p^63s^23p^5[/tex]
Number of valence electrons in chlorine is 7.Neon has an atomic number of 10 and its electronic configuration is given by:[tex][Ne]=1s^22s^22p^6[/tex]
Number of valence electrons in neon is 8.Phosphorus has an atomic number of 15 and its electronic configuration is given by:[tex][P]=1s^22s^22p^63s^23p^3[/tex]
Number of valence electrons in phosphorus is 5Sulfur has an atomic number of 16 and its electronic configuration is given by:[tex][S]=1s^22s^22p^63s^23p^4[/tex]
Number of valence electrons in sulfur is 6.So, from this, we can conclude that the correct matches will be:
Chlorine (Cl) ⇒ SevenNeon (Ne) ⇒ EightPhosphorus (P) ⇒ fiveSulfur (S) ⇒ sixLearn more about the valence electrons here:
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