Answer:
A single-replacement reaction replaces one element for another in a compound. A double-replacement reaction exchanges the cations (or the anions) of two ionic compounds.
Explanation:
What is true in a saturated solution?
A. No more solute can be dissolved.
B. No more solution can be made.
C. The concentration cannot be decreased.
D. No more solvent can be dissolved.
Answer:
A ) because no more solute can be dissolved
Please help with this question!
A sample of water is heated from 10 °C to 50 °C using 286 J of energy. What is the mass of water that was heated? help
Answer:
Mass of water == 1.71 g
Explanation:
Given data:
Initial temperature of water = 10°C
Final temperature of water = 50°C
Energy absorbed = 286 J
Mass of water = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Specific heat capacity of water is 4.18 J/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 50°C - 10°C
ΔT = 40°C
by putting values,
286 J = m × 4.18 J/g.°C × 40°C
286 J = m × 167.2 J/g
m = 286 J / 167.2 J/g
m = 1.71 g
The hottest layer of the earth
Answer:
The inner cote layer is your answer.
Explanation:
HELP I NEED HELP ON THIS QUESTION THIS QUESTION IS A TRUE OR FALSE QUESTION ......hERE IS THE QUESTION.......Temperature is the measure of the average kinetic energy of a substance. _______________
True
OR
False
Answer:
True
Explanation:
Temperature is measuring how fast the molecules or atoms of a substance are vibrating. Since movement is kinetic energy, temperature is a measurement of that kinetic energy.
If it takes 3 hours to drive a distance of 192km on a freeway, what would be your average speed in km/h? You can use a calculator.
Answer:
The average speed in km/h would be 64km per hour.
Speed = Distance /Time
192/3 = 64
Explanation:
I hope this helps
_ Li₃N + _ NH₄NO₃ --> _ LiNO₃ + _ (NH₄)₃N
Can you balance the equation?
thank you!
Answer:
1 (=nothing), 3, 3, 1 (= nothing)
Explanation:
(nothing means you dont have to write anything down)
Answer:
1,3,3,1
Explanation:
Explain the energy transformations taking place in the diagram above. There are several.
the fire is evaporating the water
Answer:
chemical energy from the fire is turned into light and heat energy (thats all i can tell there is)
Explanation:
How much energy (joules) is needed to heat 250 grams of water from 22 °C to 99 °C?
Answer:
[tex]\boxed {\boxed {\sf 80, 465 \ Joules}}[/tex]
Explanation:
We can use the specific heat formula, which is:
[tex]q=mc \Delta T[/tex]
Where q is the energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.
We know the mass is 250 grams. The specific heat capacity of water is 4.18 joules per gram degree Celsius. Let's find the change in temperature.
ΔT = final temperature - initial temperatureΔT= 99°C- 22°ΔT= 77°CNow we know all the values:
m= 250 g c= 4.18 J/ g °CΔT= 77°CSubstitute the known values into the formula.
[tex]q=(250 \ g) (4.18 \ J/g \textdegree C)(77 \ \textdegree C)[/tex]
Multiply the first 2 numbers together. The grams will cancel out.
[tex]q=1045 \ J/ \textdegree C (77 \textdegree C)[/tex]
Multiply again. This time the degrees Celsius will cancel out.
[tex]q=80465 \ J[/tex]
The energy needed is 80, 465 Joules.
PLEASE HELP ME
WILL GIVE BRAINLIEST AND 30 POINTS
Why does oxygen bond with hydrogen to make water?
A. Because oxygen only has 6 electrons in its outer shell and it wants 8. It binds with 2 hydrogens because each hydrogen atom has 1 electron in its outer shell.
B. Because oxygen only has 8 electrons in its outer shell and it can take 4 more. It binds with 2 hydrogen atoms because each hydrogen atom can carry 2 electrons in its outer shell.
C. Because oxygen only has 2 electrons in its inner shell and it needs 6 more to make 8. It binds with 6 hydrogens to fill up its shell.
D. No answer text provided.
BRAINLIEST FOR RIGHT ANSWERS PLS HELP
Complete the sentence. The lower the hydrogen ion concentration, the ______ the pH. answer choices
higher
lower
closer to 7
closer to 0
Answer:
Lower
Option B
Pls mark it as brainlist.
What are the advantages of an electromagnet?
PLS HELP ME... at least 1 sentence not from internet
Answer:
Versality, adjustable strength, greater control over the magnetic field and durability.
Explanation:
Please help! 30 points!
Please answer this!!!!!!!!
Answer:
the anwe is d if i remember right
Answer:
answer is d
Explanation:
Let’s say there are 2 planets similar in size, but one has much more mass. How will that affect the number of moons?
Answer:
0 because no value of mass at to be same
what answer should i put and the box right answer will get brainliest
Answer: x + 20
Explanation:
Velocity must always include?
Hi! Which of the following decreases kinetic energy of solvent molecules? ( I need this handed in quickly!)
A. Decreasing the pressure
B. Not stirring the solution
C. Decreasing the contact area between solvent and solute
When a drop of water sits on a leaf, It looks like it has a skin. What is this “skin” a result of? Explain.
What does adding soap do in terms of dissolving solutes? Explain.
Which solution will contain a higher concentration of iodide ions, 0.25 mol/L calcium iodide or .45 mol/L potassium iodide?
Thank you so much! I hope you have a great day!❤️
Answer:
c
Explanation:
According to the forces of attraction, decreasing the contact area between solvent and solute decreases kinetic energy of solvent molecules.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
Learn more about forces of attraction,here:
https://brainly.com/question/23841038
#SPJ6
in this cut-away image of an atom, where is the red arrow most likely pointed at the greatest probability of locating an electron
Answer:
c
Explanation:
The atmosphere is full of nitrogen gas (N2). But plants cannot use nitrogen in this form. Summarize the roles of bacteria in making nitrogen available to plants and in returning nitrogen to the atmosphere.
They absorb nitrates from the soil into their roots. Then the nitrogen gets used in amino acids, nucleic acids, and chlorophyll. When a plant or animal dies, decomposers like fungi and bacteria turn the nitrogen back into ammonium so it can reenter the nitrogen cycle.
which word describes the forces acting on the car?
inertial
balanced
buoyant
unbalanced
Answer:
inertial okokokok
The force acting on the car is unbalanced in horizontal direction. The force acting to the right is 5000 N and that to the left is 6000 N. So there will be a net force of 1000 N to the left side.
What is unbalanced force?Force is a vector quantity with a magnitude and direction. Force acting on a body able to deform it or to make a change in its state of rest or motion. The net force acting on an object depends on both the magnitude and direction of all kinds of forces acting on it.
If two forces are acting from the side, then the net force will be the sum of their magnitudes. If the forces are acting in the opposite directions, they will cancel each other or balanced.
In the given figure, the force acting upward and downward are equal in magnitude and will cancel each other. But, those acting to the left and right are not balanced and thus there will be a net force of 1000 N to the left.
To find more on unbalanced forces, refer here:
https://brainly.com/question/29769471
#SPJ2
Please help with this question!
MARKING BRAINLIEST!!
Objective(s):
In your own words, what was the purpose of this lab?
Hypothesis:
In this section, please include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
If predators are increased, then the cricket frog population will (increase/decrease/stay the same) over the span of five years.
If pollution is increased, then the cricket frog population will (increase/decrease/stay the same) over the span of five years.
If the amount of food available is increased, then the cricket frog population will (increase/decrease/stay the same) over the span of five years.
Procedure:
The procedures are listed in your virtual lab. You do not need to repeat them here. Please be sure to identify the test variable (independent variable), outcome variable (dependent variable), and control group for this experiment.
Reminder: The test variable is the item that is changing in this investigation. The outcome variable is the item that you are measuring in this investigation. The control group is the group in the experiment where the factors being tested are not applied. It allows scientists to set a baseline to compare the experimental groups that do have factors applied to them.
Test variable (independent variable):
Outcome variable (dependent variable):
Control group:
Data:
Record your data from each trial in the data chart below:
Type of Factor Beginning Frog Count Simulation 1 (Low) Simulation 2 (High)
Predators (alligators)
Pollution
Food (mosquitoes)
Graphs
Use the graphs you printed from the data chart in the virtual lab and analyze the data. Make a note of any trends that you discover.
Predators (alligators):
Pollution:
Food (mosquitoes):
Conclusion:
Your conclusion will include a summary and an interpretation of the lab results. Please write in complete sentences.
Which limiting factor(s) in this lab simulation are biotic?
Which limiting factor(s) in this lab simulation are abiotic?
Which limiting factor impacted the cricket frog population the most? Use evidence to support your answer.
Which limiting factor impacted the cricket frog population the least? Use evidence to support your answer.
Mosquitoes can carry and transmit disease to animals and humans. Explain how the cricket frog plays an important role in limiting the spread of mosquito-borne illnesses like West Nile virus and malaria.
Predict the long-term effects of these limiting factors on the cricket frog population in the pond ecosystem.
Answer:
IT CAN PROVIDE RESEARCH THAT CAN FIGHT THEORIES AND ARGUE OTHERS
HOPE THIS HELPS THIS IS MY FIRST ANSWER
(PLZ MARK ME BRAINLEST)
ANSWER ASAP!!
In your own words name two types of acids and two types of bases. Describe how each are used..
Answer:
Acids sulfuric acid, hydrochloric acid. Bases ammonia water, sodium hydroxide.
Explanation:
Answer:
Acids sulfuric acid, hydrochloric acid. Bases ammonia water, sodium hydroxide.
Explanation:
How much energy (joules) is needed to heat 250 grams of copper from 22 °C to 99 °C? The specific heat capacity (C) of copper is 0.386 J/g°C.
Answer:
7430.5 Joules (7.4*10^4 Joules)
Explanation:
Q=mc∆T
where Q is energy in Joules.
Now m=250 g
c= 0.386 J/g°C
∆T = 99 - 22 = 77 °C
plugging the values in gives
Q=250*0.386*77=7430.5 Joules
(7.4*10^4 Joules, if 2 significant figures)
which is right for brainliest
Answer:
Explanation:
Its A
GIVING BRAINLIEST FIVE STARS AND HEART!
ANSWER IN YOUR OWN WORDS!
How does the pH of an acid compare with the pH of a neutral solution?
Answer:
The pH scale is used to rank solutions in terms of how acidic or how basic they are. ... This pH value of 7 is important because it indicates a neutral solution. All other substances are compared to this neutral point. Any solution that has a pH of less than 7 is considered acidic, and anything above a pH of 7 is basic.
Explanation:
Answer:
its #5
Explanation:
GIVING BRAINLIEST 5 STARS AND HEART!
Answer in your OWN WORDS!
A gardener discovers that her prize hydrangeas have turned from pink to blue. What can you say about the soil in which the flowers are growing?
Generally speaking, acidic soil, with a pH lower than 6.0, yields blue or lavender-blue hydrangea blooms. Alkaline soil, with a pH above 7.0, promotes pinks and reds. With a pH between 6 and 7, the blooms turn purple or bluish-pink. To lower your pH, add garden sulfur or aluminum sulfate to your soil.
The secret's in the soil
Let’s look at why pH is so important.
Most major plant nutrients are more accessible at a pH of 6 to 6.5. A pH that is too high or too low can keep plants from absorbing nutrients from the soil. The nutrients are unavailable — or not absorbable — to the plant because of soil's chemistry. This problem can manifest itself in a variety of ways, but in the case of hydrangeas, the bloom color changes.
Color variation in hydrangeas is due to the presence or absence of aluminum compounds in the flowers. If aluminum is present, the color is blue. If it is present in small quantities, the color is variable between pink and blue. If aluminum is absent, the flowers are pink.
Answer:
There is somehting in the water or the soil
Explanation:
Answer, please!!!!!!
Answer:
C. SOIL THAT IS A MIXTURE OF STILT AND CLAY
PLS MAKE ME BRAINLEST!
Which of the following properties can be used as evidence a chemical reaction has occurred? (Select all that apply)
a. Density change
b. Melting point change
c. odor change
d. Color change