Answer:
An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.
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:
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 force calculated to be 25 Kg m/s2 is _______ N
Answer:
25N
Explanation:
The force calculated to be 25kgm/s² has a value of 25N.
To solve this problem, we need to consider the unit of force. The unit of force is expressed in N, newtons.
To find force;
Force = mass x acceleration
Unit of mass = kg
acceleration = m/s²
So;
1N = 1kgm/s²
Therefore 25kgm/s² is the same as 25N
6. Is the following equation balanced or
unbalanced?
Fe + S — > FeS
a) Balanced
b) unbalanced
Why does effective watershed management require the cooperation of everyone in the
watershed?
Answer:
Effective watershed management requires the cooperation of everyone located near the watershed because if one person doesn't cooperate, it would fail.
Effective watershed management requires the cooperation of everyone located near the watershed since if one person doesn't cooperate, it should be fail.
What is effective watershed management?It refers to the management that decreased the energy which is required for water treation, the water should be moved, and there should be the wastage of the water around. Also, it decreased the size and the infrastructure system should be decreased
Therefore, Effective watershed management requires the cooperation of everyone located near the watershed since if one person doesn't cooperate, it should be fail.
Learn more about water here: https://brainly.com/question/20671529
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]
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.
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.
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
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:
Is calcium more reactive than lead?
Answer:
Yes Calcium is more reactive than Lead.
Explanation:
Answer:
Yeah.
Calcium is in group II and lead is in group IV.
Since reactivity decreases from left to right of the periodic table, calcium reacts severely than lead
which one of the following is not a pure substance? A. Diamond B. water C. Oxygen D. Milk
Answer:
Milk
Explanation:
Main compounds of milk are lactose and casein. And it is also called a colloidal mixture (i.e. in which one substance of microscopically dispersed insoluble or soluble particles is suspended throughout another substance). Therefore milk is regarded as a mixture not as a pure substance. So this is the required answer.
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.
Which of the following is a unit of time?
km
hr
km/hr
mi
Answer:
hr
Explanation:
because it's short for hour
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
Can somebody help me with the last 2. Will mark brainliest
Water that flows over land and has not been absorbed into the ground is called
Answer:
its called a runoff :)
Explanation:
hope this helpssss <3
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
Identify how many of the original parent nuclei remain after three half-lives
Answer:
yes
Explanation:
i did the test
Based on the fossil records, what is true
concerning populations of organisms that lived on
Earth?
A. Most organisms are found in the earliest rock
layers.
B. Most organisms stayed the same over time.
C.
Most organisms that lived on Earth are
extinct.
Helpppppp
Answer:
C
Explanation:
The reason why is beacause most of the dino's and other spices that were here before humanity are exctinct. Some are still alive and have evovled into something greater such as a crocidile, and many other repitlians
Hope this helps!
Pls mark brainlest!
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
Use your understanding of the ideal gas law to identify the correct relationships among the variables. Pressure is . Temperature is . Volume is . Moles areUse your understanding of the ideal gas law to identify the correct relationships among the variables. Pressure is . Temperature is . Volume is . Moles are
Answer:
Pressure is inversely proportional to the volume of a gas at constant temperature and number of moles
Temperature is directly proportional to volume at constant pressure and number of moles
Volume is directly proportional to the number of moles of a gas at constant temperature and pressure
Explanation:
The ideal gas law is derived from a combination of the Boyle's, Charles' and Avogadro's law of gases.
Boyle's law states that at constant temperature, the volume of a given mass of gas (number of moles of gas is constant) is inversely proportional to the pressure exerted by the gas.
V ∝ 1/P (at constant n, T)
Charles'law states that at constant pressure, the volume of a given mass of gas (constant amount, n) is directly proportional to the temperature of the gas; V ∝ T (at constant n, P)
Avogadro’s law states that at constant temperature and pressure, the volume of a given mass of gas is directly proportional to the number of moles of gas present; V ∝ n(at constant T, P)
Combining the three equations gives the following relationship: V ∝ nT/P
By inserting a proportionality constant called the molar gas constant, R, in the relationship above, the ideal gas equation is derived as follows:
V = nRT/P or PV = nRT
Answer:
the third one
Explanation:
write a short notes on solubility product principle and its application?
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 is the percent increase in wind energy from 2006 to 2010 % increase= (( final number - initial number) divided by initial number) x100
a- 4%
b- 232%
c-7%
d-175%
Answer:
b- 232%
Explanation:
Renewable energy consumption by energy source in 2006 = 6.659 quadrillion Btu
Renewable energy consumption by energy source in 2010 = 8.049 quadrillion Btu.
In 2006, wind energy = 4%
∴ wind energy = 4% x 6.659 = 0.26636
In 2010, wind energy = 11%
∴ wind energy = 11% x 8.049 = 0.88539
∴ Percent increase = (final number - initial number) ÷ (initial number) x 100
% increase = [(0.88539 - 0.26636) ÷ 0.26636} x 100 = 232.4035% ≈ 232%.
Answer = 232%.
In multicellular organismscells that become specialized to perform a specific function are called?
A. Organelle
B. Tissue
C. Organ
D. Epithelial
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
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.
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.
Consider the properties of ionic and covalent compounds. Why do you think ionic compounds form crystals and covalent compounds form molecules?