Answer:
Tall, Res, Dom
short, RES, RES
A saturated solution of copper (II) hydroxide is prepared in a beaker by adding the solid to water and stirring. When the solution is
prepared, crystals of copper (ll) hydroxide remain on the bottom of the beaker.
Which change will cause the molar solubility of copper (II) hydroxide to increase?
A)addition of solid copper chloride
B)
addition of solid sodium hydroxide
C)
addition of aqueous hydrochloric acid
D)
dilution of the solution by addition of water
Answer:
addition of aqueous hydrochloric acid
Explanation:
The solubility of copper (ll) hydroxide in water is negligible. This implies that the substance is only slightly soluble in water.
However, the addition of aqueous hydrochloric acid leads to the following reaction;
Cu(OH)2 + 2HCl ---------> CuCl2 + 2H2O
Copper II chloride is soluble in water hence the crystals dissolve when stirred. and the molar solubility increases.
The empirical formula of a compound is CH3- The molecular formula of this compound could be C2H6 CH4 C3H6 C2H4
Answer:
C2H6
Explanation:
PLEASE HELP , 2-8 please
Which event is caused by gravity?
Answer:
C
Explanation:
Cause waves causes gravity to make higher waves
Do you think a mutation (created during reproduction) in one gene is likely to result in a new trait in an offspring? Why or why not?
Answer:
Yes and no
Explanation:
It can be silent or neutral mutation that has no effect on the structure or functioning of the organism
OR
It can be a useful (advantageous to the organism)
or a harmful mutation (causes genetic disorders)
Mutation created during reproduction in one gene may some times results in a new trait in offspring that can be of good or bad to the offspring.
What is mutation ?Genetic mutation is modification to a small section of a genome's nucleotide sequence One nucleotide is frequently replaced by another in point mutations; other changes involve the insertion or deletion of one or more nucleotides.
Errors in DNA replication or the harmful effects of mutagens, such as chemicals and radiation, which react with DNA and alter the architecture of individual nucleotides, are the two main causes of mutations.
The mutations occurred during reproduction most probably passes to the offspring as new a trait and commonly results in a genetic disorder. In some occasional cases these genetic variations can lead to silent or good characteristics.
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Which of the following is a synthetic material that can be used as an inhibitor? *
Coal
Enzymes
Preservatives
Plastic
Answer: Enzymes
Explanation: entzymes are natural catalysts, e.g. Amylase is an enzyme
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Which of the following is an example of chemical energy?
A. the heat of an oven
B. a plugged in toaster
C. an apple
D. a nuclear power plant
Balance these equations
Answer:
I have made it in above picture
hope it helps
Answer:
a is 2
b is 2
c is 2
d1 is 4
d2 is 2
Explanation:
Sandra pushed a wooden block and it slid across the floor. The wooden block gradually slowed down and stopped after moving 10 meters.
Why did the block stop moving?
Answer:
Because it lost momentum!
Explanation:
Hope this helps! Plz mark brainliest! :)
What kind of reaction is this? SiO2 --> Si + O2
Answer:
oxidation-reduction
Explanation:
Calculate: A. Mercury has a specific Heat Capacity of 0.14 J/goC. How much heat is needed to raise the thermometer temperature 15 oC to 95 oC. There is 5 g of mercury in the thermometer.
Answer:
[tex]\boxed {\boxed {\sf 56 \ Joules}}[/tex]
Explanation:
We are given the mass, specific heat, and temperature, so we must use this formula for heat energy.
[tex]q=mc \Delta T[/tex]
The mass is 5 grams, the specific heat capacity is 0.14 Joules per gram degree Celsius. Let's find the change in temperature.
ΔT= final temperature - initial temperature ΔT= 95°C - 15°C = 80°CWe know the variables and can substitute them into the formula.
[tex]m= 5 \ g \\c= 0.14 \ J/ g \ \textdegree C \\\Delta T= 80 \ \textdegree C[/tex]
[tex]q= (5 \ g )( 0.14 \ J/ g \ \textdegree C ) ( 80 \ \textdegree C)[/tex]
Multiply the first numbers. The grams will cancel.
[tex]q= 0.7 \ J/ \textdegree C(80 \ \textdegree C )[/tex]
Multiply again. This time the degrees Celsius cancel.
[tex]q= 56 \ J[/tex]
56 Joules of heat are needed.
name the type of chemical bonding involved in the formation of ammonium ion from ammonia
Answer:
When the ammonium ion, NH4+, is formed, the fourth hydrogen is attached by a dative covalent bond
Explanation:
because only the hydrogen's nucleus is transferred from the chlorine to the nitrogen. The hydrogen's electron is left behind on the chlorine to form a negative chloride ion.
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Look at the dots around each symbol and the energy levels from the resources above
Be specific with your responses for each question. Your teaching the reader via answers!
Please answer the following questions:
Why does Na(sodium) have only one dot?
Why do none of these diagrams show more than 8 dots?
What relationship do you notice between the dots in these two charts?
The number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table. Why? (Hint: OCTET RULE)
Hi! I'd love to help you if I can. Is there a picture that was provided? I'm sure I can assist you, but there seems to be some missing information.
what is X ?
A-ethanol
B-hydrogen
c-methane
D-uranium
Helppp pleaseee
How many hydrogen atoms are indicated by the formula (NH4)2C7H10O2?
Answer:
The correct answer is - 18.
Explanation:
The number of hydrogen atoms is indicated by the formula (NH4)2C7H10O2 that has two parts (NH4)2 and C7H10O2 then
Number of hydrogen atoms in (NH4)2 = 4*2= 8
number of H atoms in C7H10O2 = 10
then the total number of atoms = 10+8
= 18.
Thus, the correct answer is = 18 hydrogen atoms.
how many moles of oxygen are needed to
completely react with 8 moles of zinc?
Answer:
I Hope it help you and Please mark me as Brilliant
Explanation:
Consider this balanced chemical equation:
2 H2 + O2 → 2 H2O
We interpret this as “two molecules of hydrogen react with one molecule of oxygen to make two molecules of water.” The chemical equation is balanced as long as the coefficients are in the ratio 2:1:2. For instance, this chemical equation is also balanced:
100 H2 + 50 O2 → 100 H2O
This equation is not conventional—because convention says that we use the lowest ratio of coefficients—but it is balanced. So is this chemical equation:
5,000 H2 + 2,500 O2 → 5,000 H2O
Again, this is not conventional, but it is still balanced. Suppose we use a much larger number:
12.044 × 1023 H2 + 6.022 × 1023 O2 → 12.044 × 1023 H2O
These coefficients are also in the ratio of 2:1:2. But these numbers are related to the number of things in a mole: the first and last numbers are two times Avogadro’s number, while the second number is Avogadro’s number. That means that the first and last numbers represent 2 mol, while the middle number is just 1 mol. Well, why not just use the number of moles in balancing the chemical equation?
2 H2 + O2 → 2 H2O
is the same balanced chemical equation we started with! What this means is that chemical equations are not just balanced in terms of molecules; they are also balanced in terms of moles. We can just as easily read this chemical equation as “two moles of hydrogen react with one mole of oxygen to make two moles of water.” All balanced chemical reactions are balanced in terms of moles.
Example 8
Interpret this balanced chemical equation in terms of moles.
P4 + 5 O2 → P4O10
Solution
The coefficients represent the number of moles that react, not just molecules. We would speak of this equation as “one mole of molecular phosphorus reacts with five moles of elemental oxygen to make one mole of tetraphosphorus decoxide.”
Test Yourself
Interpret this balanced chemical equation in terms of moles.
N2 + 3 H2 → 2 NH3
Answer
One mole of elemental nitrogen reacts with three moles of elemental hydrogen to produce two moles of ammonia.
how much is the mass of a man if
he has to do 2500 joules of work in
climbing a tree 5 meters tall
Answer:
50kg
Explanation:
Using the formula for potential energy, which is the amount of energy due to position;
P.E = m × g × h
Where;
m = mass (kg)
g = acceleration due to gravity (10m/s²)
h = height (metres)
According to the information provided in this question, m = ?, P.E = 2500J, h = 5m
Using P.E = m × g × h
m = P.E/gh
m = 2500/(5 × 10)
m = 2500/50
m = 50kg
The mass of the man is 50kg.
Calculate the percentage by mass of oxygen in trioxonitrate (v) acid, (HNO3). [ H=1, N=14, O=16]
Answer:
Percentage by mass of oxygen = 76.20% (Approx)
Explanation:
Given:
HNO3
H=1, N=14, O=16]
Find:
Percentage by mass of oxygen
Computation:
HNO3
Total mass = 1 + 14 + 3(16)
Total mass = 63
Mass of oxygen = (3)(16) = 48
Percentage by mass of oxygen = [48/63]100
Percentage by mass of oxygen = 76.20% (Approx)
This is the equation for the combustion of carbon monoxide is: CO + O2
CO2
How many liters of oxygen are needed to burn 2.76 L of carbon monoxide?
Answer: 1,38 litres
Explanation: it should be 2 CO + O2 ⇒ 2 CO2
In Same temperature volumes are proportional
To amounts of substances. So amount of Oxygen is half of
Amount of CO
Answer: 1.38 L O2
Explanation:
2CO + O2 = 2CO2
So,
1 mole CO = 22.4 L CO
2 mole CO = (22.4 ×2)L CO
= 44.8 L CO
And 1 mole O2 = 22.4 L O2
44.8LCO are burned by 22.4LO2 1 L CO are burned by 22.4÷ 44.8
= 0.5 L O2
2.76L CO are burned by0.5×2.76
= 1.38 L O2
So, 1.38 L O2 are needed to burn
2.76 L CO
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How many molecules are there in a 1.43 mole sample of H2O2?
1. Al Einstein drives north 3 blocks, then turns east and drives 3
blocks. Al then turns south and drives 3 blocks.
a. Plot Al's trip on the graph
b. How could Al have made his traveling distance shorter
while maintaining the same displacement?
When managed for human consumption, a renewable resource represents a balance between an ecosystem’s health and human needs. A resource that is renewable is readily available or easily replenished, but often requires management in order to prevent depletion.
What is an example of a renewable resource that needs to be closely managed?
A) wind B) solar C) timber D) coal
Answer:
C) Timber
Explanation:
"Let's look more closely at renewable natural resources. They are the ones that can grow again. Trees are a good example. If cut down, they can regrow from seeds and sprouts."
Pls what is the difference between the mass number and atomic number
Water is believed to be one of the best fire extinguishers then why it is so that fire in oil spills over ocean/sea is difficult to douse? Choose the most appropriate explanation.
a. Water has no effect on the Ignition temperature of oil
b. Oil is less dense than water and thus continues to undergo combustion
c. Density of oil and water has no bearing on the nature of fire and hence on the
extinguisher
d. All above statements are correct explanation for the given statement
Answer:
D
Explanation:
Trust me
Which molecule would diffuse faster So, or SO,? Explain your reasoning.
The given question is incomplete. The complete question is:
Which molecule would diffuse faster [tex]SO_2[/tex], or [tex]SO_3[/tex],? Explain your reasoning.
Answer: [tex]SO_2[/tex] will diffuse faster as it has low molecuklar weight.
Explanation:
From Graham's law of diffusion rates, the rate of diffusion of a gas is inversely proportional to the square root of its molar mass.
[tex]Rate\propto \sqrt\frac{1}{M}[/tex]
or [tex]\frac{Rate_1}{Rate_2}\propto \sqrt\frac{M_2}{M_1}[/tex]
Molecular mass of [tex]SO_2[/tex] is 64 g/mol and Molecular mass of [tex]SO_3[/tex] is 80 g/mol
Thus as molecular mass of is less , it will diffuse faster.
Which example describes how the water cycle carries on energy transfer? a flooding river depositing silt on a floodplain a warm ocean current warming the air above it ocean water depositing sand particles on a shore water seeping through the soil and dissolving salts
Answer:
The water cycle is driven primarily by the energy from the sun. This solar energy drives the cycle by evaporating water from the oceans, lakes, rivers, and even the soil. Other water moves from plants to the atmosphere through the process of transpiration.
In an ecosystem, the water cycle carrying on energy transfer is best exhibited the example of a warm ocean current warming the air above it .
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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distance time graphs are made by plotting data for time and what?
Answer:
A distance-time graph shows how far an object has travelled in a given time. Distance is plotted on the Y-axis (left) and Time is plotted on the X-axis (bottom).
Please help with this question, the options are circled in yellow.
The first organic compound synthesized was
urea
carbon dioxide
none of these
O
ammonia
urea is the answer :)