Answer:
D
Explanation:
Because a metal must reactive and able to conduct
Answer:
B.Conductivity and ductility
Explanation.
Some metals are conductive and are ductile
Conductivity is the ability to have an electric flow
Ductility is the ability to bend
1. Calculate the number of grams of solute required for the preparation of 1.5L of 0.32M NaHCO3 (MW=84)
V1 X C1 = V2 X C2
Answer:
40.32 grams of solute required for the preparation of 1.5L of 0.32M NaHCO₃
Explanation:
Molar concentration or molarity is a measure of the concentration of a solute in a solution. Molarity is defined as the number of moles of solute present in one liter of solution.
Molarity is calculated by the expression:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case:
Molarity: 0.32 Mnumber of moles of solute: ?volume: 1.5 LReplacing:
[tex]0.32 M=\frac{number of moles of solute}{1.5 L}[/tex]
Solving:
number of moles of solute= 0.32 M* 1.5 L
number of moles of solute= 0.48 moles
Being the molar weight of NaHCO₃ equal to 84 g / mole, the following rule of three can be applied: if there are 84 grams in 1 mole, how much mass is there in 0.48 moles?
[tex]mass=\frac{0.48 moles*84 grams}{1 mole}[/tex]
mass= 40.32 grams
40.32 grams of solute required for the preparation of 1.5L of 0.32M NaHCO₃
Jack was playing with a toy car and a track that records velocity over time using sensors and it generated the graph below:
At which points on the graph is the car showing acceleration?
Group of answer choices
Sections a, c, and d
Sections a, b, c, and d
Sections a and d
Section a only
Answer:
a,c, and d
Explanation:
if velocity is not a flat line, that means there is acceleration, whether it is positive or negative acceleration.
Which of the following is the correct formula used for calculating Speed?
Speed = distance / time
Speed = time / distance
Speed = mass / time
Answer:
A- Speed = distance/time
Explanation:
Would make sense and that's what I remember
Soil is an essential component of the earth's crust. It enabled life to exist and
provides the services necessary for human survival. What is the effect of soil
erosion? What will you do to protect the community?
Answer:
The consequences of soil erosion go beyond the loss of fertile land. It has contributed to increased runoff and sedimentation in streams and rivers, clogging these waters and causing declines in fish and other animals.
We can protect the community from soil erosion by -:
Maintaining a good, perennial cover for plants. From mulching. Planting a crop for coverExplanation:
SOIL EROSION -: The soil erosion mechanism is both natural and man-made. In nature, this refers to the removal of the top layer of soil caused by wind and water, while human activity may increase exposure to these elements.
MAJOR EFFECTS OF SOIL EROSION -:
Pollution and Low Water Quality -: Sedimentation is created by gradual soil erosion, a process by which rocks and minerals in the soil are separated from the soil and deposited elsewhere, often in streams and rivers. Soil contaminants, such as fertilizers and pest control agents, often settle in the streams and rivers to protect crops. Water contaminants contribute to low water quality, including drinking water quality, if the contaminants are not removed prior to ingestion. As sunlight can get through the sediment, sedimentation also leads to the excessive growth of algae. According to the World Wildlife Fund, high levels of algae drain too much oxygen from the water, resulting in the mortality of marine species and reduced fish stocks.Structural Issues and Mudslides -: Soil erosion contributes to mudslides, impacting the stability of buildings and roadways and their structural integrity. Mudslides affect not only soil-supported structures, but also buildings and roads that are in the path of slides. Mudslides occur when, as a result of the intensity and energy of heavy rainfall, fine sand , clay, silt, organic matter and soil spill off the sides of hills and slopes. According to Envirothon, a program of the National Conservation Foundation and North America's largest high school environmental education competition, this runoff happens rapidly, because there is not enough time for the surface to reabsorb or catch the eroding soil.Flooding and Deforestation -: Deforestation erodes soil — the removal of trees to create space for towns and agriculture. Trees help to maintain soil in place, so winds and rains drive the loose soil and rocks to streams and rivers when they are uprooted, resulting again in unnecessary sedimentation. The thick layers of sediment keep streams and rivers from flowing smoothly, ultimately contributing to flooding. Excess water, especially during rainy seasons and when the snow melts, gets trapped by the sediment and has nowhere to go except back on land.The Deterioration of Soil -: Soil nutrient depletion is often the result of poorly performed cultivation and cultivation practices that contribute to soil erosion. For natural vegetation and agricultural purposes, excessive irrigation and obsolete tilling practices decrease the amount of nutrients in the soil and make it less fertile.PROTECTION OF COMMUNITY FROM SOIL EROSION -
Maintaining a good, perennial cover for plants -: Your perennial garden's care and upkeep need not be difficult or overwhelming. A blend of certain simple horticultural values with common sense and a good eye is a great part of good gardening.MULCHING -: The amount of water that evaporates from your soil will be reduced by mulch, greatly reducing the need to water the plants. By breaking up clay and permitting better movement of water and air through the soil. Mulch supplements sandy soil with nutrients and enhances its ability to retain water. PLANTING A CROP FOR COVER -: Winter rye in vegetable gardens, for instance. This includes annual grasses, small grains , legumes and other forms of vegetation that have been planted to provide temporary vegetative cover. Cover crops are also often tilled as a 'green manure' crop under serving.Some of the effects of erosion on the environment includes :
Washing away of soil nutrients Pollution of the waterways Blockage of drainages degradation of soilWays to protect the earth from soil erosion includes
planting of cover crops Mulching use of crush rocks on certain areasSoli erosion is the washing away of the top soil of the earth's crust which can be caused by the movement of wind , water or ice over the surface of the earth crust. this action leads to the degradation of the soil
Soli erosion leads to the washing away of soil nutrients and the pollution of waterways because of the deposition of soil particles into the waterways. the washed away soil can also block the drainages leading to a bigger problem ( flooding ).
Some of the steps that would help protect the soil from the effects of soil erosion are planting of cover crops , mulching and use of crush rocks on areas that are used most frequently to prevent the washing away of the soil.
Hence we can conclude that the effects of soil erosion are Washing away of soil nutrients , Pollution of the waterways, Blockage of drainages while ways to protect the earth from erosion are ;planting of cover crops, Mulching, use of crush rocks on certain areas
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Which element is most likely to form a negative 2 ion? a Oxygen b Magnesium c Beryllium d Nitrogen
Answer:
a
Explanation:
The density of aluminum is 2.7 g/cm3. A metal sample has a mass of 52.0 grams and a volume of 17.1 cubic centimeters. Could the sample be aluminum? EXPLAIN your answer.
Answer:
The given metal sample is not aluminum because its density is 3.0 g/cm³ while density of aluminum is 2.7 g/cm³.
Explanation:
Given data:
Density of aluminum = 2.7 g/cm³
Mass of metal sample = 52.0 g
Volume of metal sample = 17.1 cm³
which sample is that = ?
Solution:
The given problem will be solve through density formula.
d = m/v
d = density
m = mass
v= volume
Now we will put the values in formula.
d = 52.0 g/ 17.1 cm³
d = 3.0 g/cm³
It is given in question the density of aluminum is 2.7 g/cm³. The given metal sample is not aluminum because its density is 3.0 g/cm³.
Here is a more complex redox reaction involving the permanganate ion in acidic solution
In the redox reaction involving the permanganate ion in acidic solution, permanganate ion is reduced to manganese (ii) ion while iron (ii) ion is oxidized to iron(iii) ion.
What is a redox reaction?A redox reaction is a reaction in which reduction and oxidation occurs at the same time and to the same extent.
An example of a redox reaction is the reaction involving the permanganate ion and tetraoxosulphate (vi) ion in acidic solution.
The equation of the reaction is given below:
[tex]MnO_{4}^{ - } (aq) + 5Fe^{2+}(aq) + 8H^{+} \rightarrow Mn^{2+}(aq)+ 5Fe^{3+}(aq) +4H_{2}O(l) \\ [/tex]
Therefore, in the redox reaction involving the permanganate ion in acidic solution, permanganate ion is reduced to manganese (ii) ion while iron (ii) ion is oxidized to iron(iii) ion.
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are
Why the elements of d-block elements
called transition element?
Answer:
O nome "transição" vem da posição dos elementos na tabela, representando a transição do grupo 2 ao 13, pela sucessiva adição de elétrons ao orbital d. Elementos de transição externa (ou somente elementos de transição):
Without SALT or SUGAR, does the water conduct electricity?
Calculate the volume of a 0.750 M solution containing 67.0 g of KNO3
(gives you 20 points!)
Answer:
Volume of solution is 0.88 L.
Explanation:
Given data:
Molarity of solution = 0.750 M
Mass of KNO₃ = 67.0 g
Volume of solution = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Now we will calculate the number of moles.
Number of moles = mass/molar mass
Number of moles = 67.0 g/ 101.1 g/mol
Number of moles = 0.66 mol
Now we will put the values in molarity formula.
0.750 M = 0.66 mol / L of solution
L of solution = 0.66 mol / 0.750 M
L of solution = 0.88 L
Volume of solution is 0.88 L.
1. Lani conducted an experiment in which she tested the reactivity of a substance. She placed two
equal samples of a substance into identical beakers. She then filled one beaker with water and
filled the other with vinegar. After a week, she measured the samples. What was the
independent variable in her experiment?
Answer:
the independent variable is the beakers
Explanation:
Fluorescent light bulbs, or CFLs, prevent the loss of energy from light bulbs as ________ energy.
A. Light
B. Electrical
C. Chemical
D. Thermal
Please do mark me as Brainiest. I would be so happy!!! Here's your answer....
Answer:
D.)
Explanation:
Compact fluorescent lamps, or CFLs, use 75 percent less energy than a traditional incandescent bulb, but they never quite caught on for home use.
Have a great rest of your day!
Which process squeezes layers of sediment together?
compaction
deposition
erosion
weathering
Answer:
The answer is compaction.
Explanation:
The graph below represents the relationship between the distance traveled and time elapsed for an object in motion.
During which interval is the speed of the object changing?
Group of answer choices
BC
DE
Answer:
DE
Explanation:
BC has a constant speed of 0, and DE does not have a consistent slope, therefore the speed is changing
The speed is defined as the rate of change of distance with respect to time.
In interval DE , speed of the object is changing.
Since, speed is defined as the rate of change of distance with respect to time.
[tex]v=\frac{dx}{dt}[/tex] , where x represent distance.
Slope of given graph represent distance, In interval BC slope is constant.
In interval, DE slope is always changing at each point.
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Question 4 of 8
What can cause an object to move?
A. Balanced forces
B. Unbalanced forces
C. Inertia
D. A reference point
SUER
Answer:
unbalanced forces can cause an object to move.
Answer:
Unbalanced Forces
Explanation:
how the El Niño event affected the weather, food production, water supply, or human health?
El Niño was responsible for the following events in 2015:
16 tropical cyclones in the central Pacific hurricane basin
three category 4 hurricanes occurred at the same time
emergency water rationed in St. Lucia and San Juan
65 percent of Antigua's farmers went out of business
northern, central, and southeastern Ethiopian highlands received 50–90 percent of their normal rainfal.
Answer:
EL Niño had hurricanes and so many damages in nature. :)
Explanation:
it creates warm weather, there is low pressure towards canada
Numerous health issues, such as disease outbreaks, malnutrition, heat stress, and respiratory illnesses are being brought on by the severe drought and associated food insecurity, flooding, precipitation, and temperature increases brought on by El Nino.
What is El- Nino?The exceptional warming of surface waters in the eastern tropical Pacific Ocean is referred to as El Nino, a climate pattern. El Nino is a bigger phenomena known as the El Nino-Southern oscillation, and it is its warm phase.
Climate change brought on by El Nino can be severe and extensive. Increased precipitation results from convection over warmer surface waters. In Ecuador and northern Peru, rainfall rises dramatically, causing coastal erosion and flooding.
Homes, businesses, schools, and hospitals may be destroyed by heavy rains and flooding. They hinder transportation and obliterate crops. As reservoirs dry up and rivers carry less water, the droughts pose a threat to the area's water resources. Agriculture is in danger since it depends on water for irrigation.
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A sample of the igneous intrusion within the outcrop has 1682 Potassium-40 atoms, and 318 Argon-40 atoms. How old is the igneous intrusion
Answer: the igneous intrusion is 325 million years old
Explanation:
In the sample of the igneous intrusion
Number of Potassium-40 atoms (parent atom) = 1682
Number of Argon-40 atoms (daughter atom) = 318
Half-life of the Potassium40- Argon40 radioactive pair = 1.3 billion years = 1.3 × 10⁹ years
We now want to know the absolute age of the igneous intrusion.
At t = 0
i.e. when the igneous intrusion took place there will be no daughter atom (Ar-40).
So the number of parent (K-40) will be 1682 + 318 = 2000 atoms
Total number of atoms = parent + daughter = 2000 + 0 = 2000
Now after a given time
Number of Parent atom (K-40) = 1682
Number of Daughter atom (Ar-40) = 318
percent of parent atom (K-40)
= (Number of parent atom / total number of atoms) × 100
= (1682/2000) × 100
= 84.1 %
percentage of daughter atom (Ar-40) = 100 - % of K-40 atoms
= 100 – 84.1
= 15.9 %
Now from the table of “decay parameters for all radioactive decay pairs” which is uploaded along this answer
When Parent atom = 84.1 % and daughter atom = 15.9 %
then Age is given as 0.250T_1/2
THEREFORE age of the igneous intrusion
= 0.250 × 1.3 × 10⁹ years
= 0.325 × 10⁹ years
= 325 million years.
SO the igneous intrusion is 325 million years old
A fireworks designer is planning a red-, white-, and blue-themed finale for her fireworks display. She is also planning a fountain effect. Describe the chemicals she will need and how each will produce the desired effect.
Answer:
strontium salts, lithium salts, lithium carbonate, Li2 CO3 = red, whitehot metal, such as magnesium or aluminum, barium oxide, BaO = white, copper compounds + chlorine producer, copper acetoarsenite (Paris Green), Cu3 As2 O3 Cu(C2 H3 O2 )2 = blue. We will need a metal chemical, so that when it is heated it will produce the incandescent to make the fountain effect.
Explanation:
^^
All sound begins with a vibration. Sound travels through the air to your ears which our brains interpret as sound. How are guitar strings like the particles in matter?
1.They are gold
2.They vibrate
3.They are a liquid
Pick One.
Please help!!!!!!!!!!!
Answer:
They both have two valence electrons
Answer:
I am guessing because they are both metals
What does Newton’s first law of motion state?
Answer:
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia. ... If that velocity is zero, then the object remains at rest.
Explanation:
Answer:
Before Galileo and Newton, many people thought that objects lost speed because they had a built-in natural tendency to do so. But those people weren't taking into account the multiple forces here on Earth - for example, friction, gravity, and air resistance - that cause objects to change their speed. If we could see the motion of an object in deep interstellar space, we would be able to observe the natural tendencies of an object that is free from any external influence. In deep interstellar space we would observe that if an object had a speed, it would continue to move with that speed until there was some force causing a change in its motion. Likewise, if an object were at rest in interstellar space, it would remain at rest until there was a force causing a change in its motion.
Explanation:
Hope it helped you =)
The expression CaCO3 → CaO + CO2 is an example of a
Answer:carbin dioxide co^2
Explanation:
Suppose 4.0 g of hydrogen reacts completely with 32.0 g of oxygen to form one product what is the mass of the product?
Answer: The mass of product, [tex]H_2O[/tex] is, 36.0 grams.
Explanation : Given,
Mass of [tex]H_2[/tex] = 4.0 g
Mass of [tex]O_2[/tex] = 32.0 g
Molar mass of [tex]H_2[/tex] = 2 g/mol
Molar mass of [tex]O_2[/tex] = 32 g/mol
First we have to calculate the moles of [tex]H_2[/tex] and [tex]O_2[/tex].
[tex]\text{Moles of }H_2=\frac{\text{Given mass }H_2}{\text{Molar mass }H_2}[/tex]
[tex]\text{Moles of }H_2=\frac{4.0g}{2g/mol}=2.0mol[/tex]
and,
[tex]\text{Moles of }O_2=\frac{\text{Given mass }O_2}{\text{Molar mass }O_2}[/tex]
[tex]\text{Moles of }O_2=\frac{32.0g}{32g/mol}=1.0mol[/tex]
Now we have to calculate the limiting and excess reagent.
The balanced chemical equation is:
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
From the balanced reaction we conclude that
2 mole of [tex]H_2[/tex] react with 1 mole of [tex]O_2[/tex]
From this we conclude that, there is no limiting and excess reagent.
Now we have to calculate the moles of [tex]H_2O[/tex]
From the reaction, we conclude that
2 moles of [tex]H_2[/tex] react to give 2 moles of [tex]H_2O[/tex]
Now we have to calculate the mass of [tex]H_2O[/tex]
[tex]\text{ Mass of }H_2O=\text{ Moles of }H_2O\times \text{ Molar mass of }H_2O[/tex]
Molar mass of [tex]H_2O[/tex] = 18 g/mole
[tex]\text{ Mass of }H_2O=(2.0moles)\times (18g/mole)=36.0g[/tex]
Therefore, the mass of product, [tex]H_2O[/tex] is, 36.0 grams.
PLZ ANSWER QUICK PLZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
Answer:
D. Atom, Electron, and Proton
Explanation:
Because Atoms are the smallest and they make up everything.
because the Proton, stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10−27 kg, which is 1,836 times the mass of an electron.
Answer:
C
Explanation:
Electrons are the smallest part of matter. Protons are bigger than electrons. And the whole atom is bigger than everything inside it.
what does Ca stand for in chem?
Answer:
Calcium
Explanation:
Periodic table
The arrangement of electrons in energy shells is called
Answer:
They are called subshells
electron configuration
Five characteristics of gas,solid and liquid(make brainest)
Answer:
1. Gases have neither definite shape nor definite volume. They expand to the size of their container.
2. Gases are fluid, and flow easily.
3. Gases have low density, unless compressed. ...
4. Gases diffuse (mix and spread out) and effuse (travel through small holes).
Explanation:
what are the two components present in the colloid
Answer:
the two components in colloid are dispersed phase and dispersing medium
I hope this helps
50 mL of 2.2 M HCl is combined with 50 mL of 2.0 M NaOH in a coffee-cup
calorimeter. The temperature of the solution increases 13.4°C. Assume the
calorimeter is a perfect insulator and the mixture has a specific heat capacity identical
to pure water (4.184 wc)
.
Calculate the heat change from the chemical reaction (in units of kJ). (Pay attention to
sign conventions and do not write the units in your typed answer.)
Answer:
-56.1kJ/mol
Explanation:
The reaction between HCl and NaOH is:
NaOH + HCl → NaCl + H₂O + ΔH
Where ΔH is heat change in the reaction.
As the temperature of the solution increases, the heat is released and ΔH < 0
The heat released in the reaction is obtained using coffe-cup calorimeter equation:
Q = C×m×ΔT
Where Q is heat
C is specific heat of the solution (4.184J/g°C)
m is mass of solution: Assuming density = 1g/mL, 100mL of solution = 100g
And ΔT is change in temperature (13.4°C)
Replacing:
Q = C×m×ΔT
Q = -4.184J/g°C×100g×13.4
Q = -5606.6J
Now, in the reaction you have:
Moles HCl:
0.050L * (2.2mol/L) = 0.11 moles
Moles NaOH:
0.050L * (2.0mol/L) = 0.1 moles
That means the moles of reaction are 0.1 moles, and heat change in the chemical reaction is:
5606.6J / 0.1 mol = 56066J =
-56.1kJ/mol
Is crumbling a cookie, a physical change? Explain why. My child is having problems with this question, and I'm not so sure how to explain it.
Answer:
Because the sugar flour and eggs can no longer be separated. The properties of the materials have changed so it's a chemical change
Sugar, flour, and eggs cannot be separated. The materials' properties have changed, resulting in a chemical change.Therefore, crumbling a cookie is not a physical change.
What is physical change ?Physical changes affect a chemical substance's form but not its chemical composition. Physical changes can be used to separate mixtures into their component compounds, but not to separate compounds into chemical elements or simpler compounds.
A chemical change is the transformation of one material into another, the formation of new materials with different properties, and the formation of one or more new substances. It occurs when one substance reacts with another to form a new substance.
A physical change is characterized by a change in physical properties. Melting, transition to a gas, change in strength, change in durability, changes in crystal form, textural change, shape, size, colour, volume, and density are all examples of physical properties.
Thus, crumbling a cookie is not a physical change.
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