Answer: A. Cows
E. Fertilizer
Explanation:
How many chickens would it take to kill an elephant?
Answer: One chicken with a bomb
Answer: 26,000 chickens
Explanation:
Determine the formula for iron l oxide
Which type of bond will most likely be found in HBr given that the electronegativity of hydrogen is 2.20 and the electronegativity of bromine is 2.96?
an ionic bond
a metallic bond
a polar covalent bond
a nonpolar covalent bond
Answer:
C. A polar covalent bond
The most likely bond found in HBr is a polar covalent bond.
What kinds of bonds exist?Ionic bond : It is formed between metals and nonmetals and the difference in their electronegativities is higher than 1.7.Metallic bond : It is formed between metals with and the difference in their electronegativities is very small.Polar covalent bond : It is formed between nonmetals and the difference in their electronegativities is between 0.4 and 1.7.Nonpolar covalent bond: It is formed between nonmetals and the difference in their electronegativities is lower than 0.4.In HBr, both H and Br are nonmetals so the bond must be covalent. The difference in their electronegativities is:
ΔE = |EN(H)-EN(Br)| = |2.20-2.96| = 0.76
The most likely bond found in HBr is a polar covalent bond.
Learn more about polar covalent bonds here: https://brainly.com/question/3978603
How does the rock cycle work help use a easy understanding small summary
Answer: this is how it works
Explanation:
The magma bursts through Earth's surface in the form of a volcano. Heat and pressure deep in the Earth makes some rocks change to metamorphic rock. Layers of rock get squashed and packed together and gradually harden to form sedimentary rock. The igneous rock gets broken down by weather, and the cycle begins again.
Why is most of the Earth’s fresh water unavailable?
Answer:
2.5% of the earth's fresh water is unavailable: locked up in glaciers, polar ice caps, atmosphere, and soil; highly polluted; or lies too far under the earth's surface to be extracted at an affordable cost.
Explanation:
A small bubble rises from the bottom of a lake, where the temperature and pressure are 8°C and 6.4 atm, to the water's surface, where the temperature is 25°C and pressure is 1.0 atm. Calculate the final volume (in ml) of the bubble if its initial volume was 2.1 ml.
a. 0.070 ml
b. 21 ml
c. 14 ml
d. 42 ml
Answer:
b
Explanation:
What will be the mass of 9.95 liters of propane gas (C3H8) at STP?
Answer:
19.5g
Explanation:
Given parameters:
Volume of propane gas = 9.95L
Unknown:
Mass of propane gas = ?
Solution:
To solve this problem, find the number of moles first.
At STP;
22.4L of gas makes up 1 mole
9.95L of gas will have a [tex]\frac{9.95}{22.4}[/tex] = 0.44mole
So;
Mass of propane gas = number of moles x molar mass
Molar mass of propane = 3(12) + 8(1) = 44g/mol
Mass = 0.44 x 44 = 19.5g
At what temperature will equal masses of HCl and NH4CI dissolve in 100g water?
Explanation:
NH4Cl at 90°C _.70 a ... m aximum amount of solute that will dissolve at that specific temperature (no ... A mass of 100 g of NaNO3 is dissolved in 100 g of water at 80°C. Is the ... SO2, NH3, HCl.
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why are cells small?
Answer:
you know what i really dont know but imagine if they were huge
Explanation:
The beakers in the picture above are labeled according to the ionic solutions they contain. What metal or metals could replace copper in the copper(II) nitrate solution?
Explanation:
When a metal replaces another metal in solution, we say such a reaction has undergone a single displacement reaction.
In such a reaction, metal higher up in the activity series replaces another one due to their position.
To known the metal or metals that will replace the given copper, we need to reference the activity series of metals.
Every metal higher than copper in the series will displace copper from the solution.
So, there metals are: potassium, sodium, lithium, barium, strontium etc.
Some items, such as rubber, float on the water, while some items, such as gold, sink in
the water. If an item floats is it more or less dense than the water?
Answer:
If an item is less dense, it floats on the water.
Explanation:
We know this since the more dense something it usually is heavier than if it was less dense. Which ways it down resulting to it sinking.
would using a strainer be filtration?
Answer:
To some extent, yes
Explanation:
what will happen an unboiled egg is placed in the beaker of fresh water and salt water
Answer:
Explanation:
1
When you break an iron magnet into two pieces, you get ____.
two north poles
two south poles
two north poles and two south poles
a piece of iron that is no longer magnetic
Answer:
two north poles and two south poles
Explanation:
A single magnet has a north pole and a south pole. If it is broken into two pieces, then each of the two pieces will have a north pole and a south pole.
No matter how many times or into how many pieces a magnet is broken, the resulting pieces will have two poles each.
Answer:
Each piece will still have a north pole and a south pole.
Explanation:
How many atoms are there in 3.3 moles of strontium?
Explanation:
Multiply the moles Fe by 6.022×1023 atoms/mol
The liquid inside the cell is called
Answer:
The cytoplasm
Explanation:
Cytoplasm is the gelatinous liquid that fills the inside of a cell. It is composed of water, salts, and various organic molecules. Some intracellular organelles, such the nucleus and mitochondria, are enclosed by membranes that separate them from the cytoplasm.
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What happens to the ice pack over time?
Answer:
it melts?
I don't really know but I have 60% that I think the answer is correct
1234567 sc: thatbitxh.lizzy
Answer:
okyay
Explanation:
lol
Answer:
12345678
Explanation:
i don't know so yea
Which phase do the chromosomes line up in the middle
Answer:
metaphase
Explanation:
the cells chromosomes line themselves in the middle of the cell through a type of cellular tug of war.
Answer:
metaphase
Explanation:
During metaphase, the cell's chromosomes align themselves in the middle of the cell through a type of cellular "tug of war." The chromosomes, which have been replicated and remain joined at a central point called the centromere, are called sister chromatids.
what mass of ZnCI2 can be prepared from the reaction of 3.27 grams of zinc with 3.30 grams of HCI?
Zn + 2HCI —-> ZnCI2 + H2
Answer:
Zn. + 2 HCl ----------> ZnCl2. + H2
Explanation:
Mass of Zn in mole = 3.27/ 65.38= 0.050010.... mol
Mass of HCl in mole = 3.3/ 73= 0.044....mol
Hence, limiting reagent is HCl
Molar mass of ZnCl2= 136.38g
Let mass of ZnCl2 be x
x = 3.3*136.38÷ 73 = 6.165...
So, the mass of ZnCl2 is 6.17 g
please help i will mark brainlist
Answer:
432cm³
Explanation:
Given parameters:
Length = 12cm
Height = 6cm
Width = 6cm
Unknown:
V = ?
Solution:
We have been given that;
V = L x W x H
So;
V = 12cm x 6cm x 6cm = 432cm³
Consider the following reaction, which occurs at standard state:
2CI(g) -- CI2(g) H= -243.4 kJ
If 15.0g of CI is concerted to chlorine, determine the heat released from this reaction.
Answer:
The heat energy released from the reaction is approximately 51.4791 kJ
Explanation:
The given parameters are;
The heat of the reaction of 2Cl (g) → Cl₂ (g) = -243.4 J
The given mass of Cl being converted to chlorine gas, Cl₂ = 15.0 g
From the reaction for the heat of formation, we have;
2 moles of chlorine produces 1 mole of Cl₂ to release 243.4 kJ of energy per mole of Cl₂
The mass of 1 mole of Cl ≈ 35.453 g
Therefore, from number of moles, n = Mass/(Molar Mass), we have;
The number of moles of chlorine, in 15.0 g of chlorine = 15.0/35.453 ≈ 0.423 moles
Therefore, given that 2 moles of Cl produces 1 mole of Cl₂, we have;
0.423 moles of Cl will produce 0.423/2 ≈ 0.2115 moles of Cl₂
The heat energy released from the reaction is therefore, H ≈ 0.2115 × 243.4 kJ = 51.4791 kJ.
Q1; ___________ have almost half a set of electrons in the outer most energy level.
1- metalloids
2- metals
3- nonmetals
Q2;________ are known to be gasses at room temperature.
1- nonmetals
2- metalloids
3- metals
Answer:
2 metalliods....
1 metals
How many torr, atms, and psi is 303.9 kPa equal to?
Torr=
Atms=
Psi=
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Answer:
2.99 atm
2279.43 torr
44.07 psi
Explanation:
Torr, atms and psi all units are units of pressure.
Conversion from KPa to atm:
1 KPa is equal to 0.00987 atm. To convert from KPa to atm we will multiply the given value with 0.00987 atm.
303.9 KPa × 0.00987 atm / 1 KPa
2.99 atm
Conversion from KPa to torr:
1 KPa is equal to the 7.5006 torr. To convert from KPa to torr we will multiply the KPa value by 7.5006.
303.9 KPa × 7.5006 torr/ 1 KPa
2279.43 torr
Conversion from KPa to psi:
psi is pound per square inch. 1 KPa is equal to the 0.1450 psi. To convert from KPa to psi we will multiply the KPa value by 0.1450 psi.
303.9 KPa × 0.1450 psi / 1 KPa
44.07 psi
Ionic bonds form between _____ which form positively charged ions and _____ which form negatively charged ions.
ionic bonds form between metals which form positively charged ions and nonmetals which form negatively charged ions.
What is the chemical formula for sodium sulfate
Answer:
Na2So4
Explanation:
Na is group 1, so has a charge of 1+
Sulphate’s formula is SO4 2-,
because sulphate has double the charge of Na, you need two Na’s to make it equal.
Therefore it’s Na2SO4
Put the following metals in order of reactivity.
Iron, potassium, copper, zinc, lead, calcium, magnesium, sodium, gold
Most reactive
Least reactive
Complete the equations
metal + oxygen → …………………….
metal + water → ……………………. + …………………….
metal + acid → ……………………. + …………………….
What is formed when magnesium burns in air?
…………………….…………………….…………………….…………………….
What happens when copper is put into a beaker of water?
…………………….…………………….…………………….…………………….
How do you test for hydrogen gas?
…………………….…………………….…………………….…………………….
What is formed when sodium reacts with hydrochloric acid?
…………………….…………………….…………………….…………………….
How should metals more reactive than carbon be extracted from their ores?
…………………….…………………….…………………….…………………….
Why is gold used in jewelry?
…………………….…………………….…………………….…………………….
What is the rule for displacement reactions?
…………………….…………………….…………………….…………………….
Tick which reactions would happen
copper
Magnesium
zinc
copper sulfate
Magnesium
sulfate
Zinc Sulfate
Using the reactions from Q10. Choose 1 reaction you’ve ticked and explain why it happens. Choose 1 reaction you haven’t ticked and explain why it doesn’t happen.
…………………….…………………….…………………….…………………….
…………………….…………………….…………………….…………………….
…………………….…………………….…………………….…………………….
…………………….…………………….…………………….…………………….
Write word and symbol equations for the first reaction from Q11.
…………………….…………………….…………………….…………………….
…………………….…………………….…………………….…………………….
Answer: copper, zinc, lead, magnesium, potassium, sodium, iron, gold.
Explanation:
10
If velocity is positive, which would most likely yield a negative acceleration?
O O OO
A final velocity that is faster than an initial velocity.
A time that is less than a half hour.
An initial velocity that is faster than a final velocity.
A time that is greater than a half hour.
Answer:
An initial velocity that is faster than a final velocity
Explanation:
The relationship between velocity and acceleration is given as follow;
Acceleration = Change in velocity / Time
Change in Velocity = Final Velocity - Initial Velocity
From the formular, time is not able to affect the sign of the acceleration.
A negative acceleration is also referred to as deceleration and this occurs when there is a drop in velocity.
A drop in velocity occurs when the initial velocity is faster than the final velocity.
which diagram would it be?
Answer:
2CH4 ------> 3H2 + C2H2
Explanation:
The law of conservation of mass states that atoms can neither be created nor destroyed in a chemical reaction.
The implication of this law is that the number of atoms of each element on the reactant side must be equal to the number of atoms of each element on the product side.
This law is only obeyed by the reaction, 2CH4 ------> 3H2 + C2H2
There were eight atoms of H on the left hand side as well as the right and side of the reaction equation. There were two atoms of C on both the left and right hand sides of the reaction equation respectively. Hence, the law was obeyed here.
What is the charge of an electron?
A-negative
B-neutral
C-positive
D-none of these