Answer:
Convection currents occur when a fluid is near a heat source.
Explanation:
Heat sources provide energy to their surroundings. When fluid receives this energy, molecules inside it move around more, spacing out from each other and lowering the density.
We know from helium balloons that things with lower densities than their surroundings are pushed upwards. Therefore, the fluid close to the heat source moves upwards, as it is hotter than the rest.
As this fluid moves up, cooler molecules drift down, succumbing to gravity.
As hot molecules move up and further from the heat source, they cool down, and drop. As colder molecules drop and move towards the heat source, they heat up, and begin rising.
This results in a circular motion called a convection current. It is present in the strong winds at the seaside and in the magma in the Earth's mantle.
What happens when the number of particles in an atom is changed
Answer:
When the number of particles, though in this case I think you mean (electrons), changes in an atom....it become an ion. Ions are atoms that were chnaged by losing or gaining an electron. If an atom gains an electron it will have a negative charge. If an atom loses an electron it will have a positive charge. Hope this was helpful!!
Explanation:
which phrase describes a gas?
Answer:
Gas is a state of matter where particles flow freely. It has no definite shape or volume.
Explanation:
A student sets up an experiment to test the factors that affect the
solubility of sodium chloride. The student places 5.Og of sodium chloride in
four beakers containing 250 mL of water. The student places each beaker
on a different hot plate and heats them to the following temperatures:
Beaker A: 30°C, Beaker B: 40°C, Beaker C: 50°C, Beaker D: 60°C. In which
beaker would the sodium chloride dissolve at the fastest rate? *
Beaker A
Beaker B
Beaker C
Beaker D
Answer:
Beaker D
Explanation:
Since Sodium Chloride melting point is 1,474°F (801°C) the logical possible answer would be D: 60C.
How cab yout knowledge about solutions help improve health or the quality of life? In what practical way can you use your knowledge about it?
Answer:
Here are possible ways to improve health and quality of life:
-Exercise almost everyday
-Be more positive
-Get rid of bad habits
-Start good habits
-Get new things
-Learn New things
Based on the chemical equation provided, use the drop-down menu to choose the coefficients that will balance the
chemical equation.
102
DH20
1)H₂ +
-
Answer:
2(H2) + 1(O2) = 2 (H2O) is the balanced equation
Answer:
(2)H2O
(2)H2
(1)O2
Explanation:
it's not 2 1 2
or
2 1 1
Patrick did an experiment to study the solubility of two substances. He poured 100 mL of water at 20 °C into each of two beakers labeled A and B. He put 60 g of Substance A in the beaker labeled A and 60 g of Substance B in the beaker labeled B. The solution in both beakers was stirred for 1 minute. The amount of substance left undissolved in the beakers was weighed. The experiment was repeated for different temperatures of water and the observations were recorded as shown.
Experimental Observations
Substance Mass of Undissolved Substance at Different Temperatures (gram)
20 ° 40 ° 60 ° 80 °
A 18 14 10 5
B 60 60 60 60
Part 1: Which, if any, substance is soluble in water?
Part 2: Explain how the data helped you determine solubility for both substances for temperatures 20 °C to 80 °C.
Answer:
1. SUBSTANCE A IS SOLUBLE IN WATER WHILE SUBSTANCE B IS INSOLUBLE IN WATER.
Looking at the information given in the question about the two substance, you will discover that 60 g of both substances were initially put in the beaker. While the mass of undissolved substance for substance A is variable, that of substance B remain constant at 60 g, this shows that the substance is not soluble in water.
2. Looking at the two substances given in the question, you will observe that for substance A, the degree of solubility in water decreases as the temperature of the water increases. For instance, at 20 degree Celsius, the mass of undissolved substance is 5 and as the temperature increases to 40, 60 and 80 degree Celsius, the mass of undissolved substances also increase to 10, 14 and 18 respectively. This shows that, the higher the temperature, the less of the substance will dissolve. For substance B, the mass of undissolved substance remain constant at all temperatures, which shows that the substance is insoluble in water. Thus, the data given helps to determine the solubility of the substance by giving the amount of substances that are insoluble at each temperature.
Explanation:
A student is participating in the school science fair. She wants to investigate household cleaners.
Which question can she best answer through scientific investigation?
A. Which household cleaner is most effective at removing stains?
B. Which household cleaner smells the best?
C. How often should a person use household cleaners?
D. Where should a person buy household cleaners?
Answer:
A
Explanation:
Is this a balanced chemical equation?
Gold atoms can be identified based on the number of which subatomic particles?
A.neutrons
B.electrons
C.nuclei
D.protons
Answer:
D.protons
Explanation:
Gold is a chemical element and it is the element 79 on the periodic table. Thus, it has an atomic number of 79. The chemical symbol for Gold is Au, it is chemically classified as a transition metal and as a solid at room temperature.
Generally, the chemical element Gold is known to be malleable, ductile and a good conductor of electricity and heat. Also, it is a non-toxic chemical element with a beautiful lustrous sheen.
Gold atoms can be identified based on the number of protons (79) because it represent its atomic number, which is what is used to differentiate an atom of an element from the atom of another chemical element.
the basic unit of matter is know as a(n)
a. atom
b.cell
c. element
d. compound
Answer:
a. atom
Explanation:
Which element is a liquid at 1000.K
Answer:
silver?
Explanation:
If an atom has 56 protons and 58 neutrons, how many electrons
would this atom have?
Because the protons = the electrons so the atom will have 56 electrons.
This atom would have 56 electrons.
Atomic Structure:
In a neutral atom, the number of protons and number of electrons are same which is equal to the atomic number of an atom.The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.So, it is given that;
Number of protons=56
Number of neutrons=58
Thus, number of electrons=56 (since, the number of protons and number of electrons are same)
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help its due soon i need to get this right to pass the class
Answer:
the answer I am pretty sure is A
Explanation:
Because the way that a generator works is moving electric current around a wire and using magnets to make more energy. please tell me if I am wrong.
Answer: A
Explanation: Because the way that a generator works is moving electric current around a wire and using magnets to make more energy.
A steel cylinder contains a glass jar of sodium metal surrounded by water. All together the cylinder and its contents weigh 1000g. The cylinder is dropped which breaks the glass and shortly after popping sound is heard. Since the steel container did not break, we can assume that... *
Answer:
A steel cylinder contains a glass jar of sodium metal surrounded by water. All together the cylinder and its contents weigh 1000g. The cylinder is dropped which breaks the glass and shortly after popping sound is heard. Since the steel container did not break, we can assume that... *
Explanation:
stays the same the mass and stuff dosnt change.
13. Identify the state(s) of matter described by each statement.
a. has a definite volume
b. has a definite shape
c. completely fills any container
d. flows
e. is made of particles held together in a rigid structure
f. is made of particles that are close together
Answer:
A: solid and liquid
B: solid
C: gas
D: liquid and gas
E: solid
F: solid
Two scientists write a paper detailing their research and conclusions and submit it to a scientific journal. Several
months later, the publisher sends them back the paper. Many comments from several fellow scientists are attached.
Which step will the authors of the paper most likely take next?
They will change their research to a different topic and start all over again
O They will alter the data to match the results that their peers were expecting.
O They will incorporate the suggestions from their peers and resubmit the paper.
They will sue the journal for delaying their research and not printing the paper
Answer:
C
Explanation:
I just took the test
Answer: They will incorporate the suggestions from their peers and resubmit the paper.
Explanation:E 2022
Is water an element?
a:yes
b:We can't tell from a periodic table
c:No
Answer:
no it is not. The name refers to the chemical formula of water H20 so water is made from elements, but is not itself an element
The following data was collected: 5.5 m; 5.3 m; 5.4 m. The actual length is 5.4 m. What is the accuracy and precision for this set of measurements?
Answer:
The measurement is precise and accurate
Explanation:
The accuracy of a measurement of length is often indicated by how "precisely" the length measurement can be read depending on the type of measuring instrument used scale.
Looking at the measurement, we can see that the values lie between ±0.1 from the expected values hence it is accurate.
Also, the values differ from each other by ±0.1 hence it the measurements are precise.
Answer:
Accuracy:
5.5 = 98.15%
5.3 = 98.15%
5.4 = 100 %
Precision:
5.5 ± 0.14
5.3 ± 0.14
5.4 ± 0.14
Explanation:
Accuracy is determined using; 100% - % error
% error = absolute error/actual value * 100%
5.5 - 5.4/5.4 * 100% = 1.85%
accuracy = 100 % - 1.85 % = 98.15%
5.3 - 5.4/5.4 * 100 5 = 1.85%
accuracy = 100 % - 1.85 % = 98.15%
5.4 - 5.4/5.4 * 100 % = 0 %
accuracy = 100 % - 0% = 100%
Precision is determined by obtaining the standard deviation of the mean;
s = √{∑(|x - m|)²/(n - 1)}
where x is the value, m is mean of values , n is number of values
mean = (5.5 + 5.3 + 5.4) / 3 = 5.4
deviations from mean, (x - m) are as follows;
|5.5 - 5.4| = 0.1
|5.3 - 5.4| = 0.1
|5.4 - 5.4| = 0
∑(x - m)² = (0.1 + 0.1 + 0) ²= (0.2)² = 0.04
(n - 1) = 3 - 1 = 2
s = √(0.04/2)
s = ± 0.14
Therefore, the precision of each measurement is as follows;
5.5 ± 0.14
5.3 ± 0.14
5.4 ± 0.14
What is the melting point of the above substance?
Can someone please help me with this
Answer:
b Mass +1 charge 0
Explanation: protons are neutral, so neutrons do not have charge
Convert the following: 4.6L(liters) to ml(milliliters).
a. 0.46 ml
b. 46 ml
c. 46,000 ml
d. 4600 ml
Answer:
D
Explanation:
Answer:
D
Explanation:
1000 mL = 1 L
so
1000 × 4.6 = 4600
The least massive of all the alkaline earth metals. Who
am I?
Chased on atomic mass, the least massive of the alkaline earth metals is Beryllium.
What are alkaline earth metals?Alkaline earth metals are the metals found in group 2 of the periodic table of elements.
The alkaline earth metals include:
Beryllium Magnesium CalciumThe least massive is the first element in the group.
Therefore, the least massive of the alkaline earth metals is Beryllium.
Learn more about alkaline earth metals at: https://brainly.com/question/1085966
When a candle burns it produced 41,300 Joules per 1 gram. Use dimensional analysis to convert this to Calories per pound.
1 cal = 4.184 J
16 ounces = 1 pound
1 ounce = 23.5 grams
1 Calorie= 1000 calories
Answer:
4477381.7 calories/pound
Explanation:
It is given that,
When a candle burns it produced 41,300 Joules per 1 gram.
We need to convert it into calories per pound.
We know that,
1 cal = 4.184 J
⇒ 1 J = (1/4.184) cal
1 pound = 453.592 grams
⇒1 g = (1/453.592) pounds
Now,
[tex]41300\ \text{Joules per gram}=\dfrac{41300\ \text{Joules}}{\text{gram}}\\\\=41300\times \dfrac{\dfrac{1}{4.184}\ \text{calories}}{\dfrac{1}{453.592}\ \text{gram}}\\\\=4477381.7\ \text{calories/pound}[/tex]
Hence, 41,300 Joules/gram = 4477381.7 calories/pound.
Make a claim describing the relationship between Force and charge.
Answer:
According to Coulomb, the electric force for charges at rest has the following properties: Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge. The attraction or repulsion acts along the line between the two charges
Which statement best describes the atoms of the gas neon?
They slide past each other.
They move freely in all directions.
They vibrate in place.
They are packed closely together.
Answer:
B. They move freely in all directions.
Explanation:
i got it right on my test on edge
Answer:
B. They move freely in all directions.
Explanation:
Define the law (Principle) of Uniformitarianism
Answer:
known as the Doctrine of Uniformity or the Uniformitarian Principle, is the assumption that the same natural laws and processes that operate in our present-day scientific observations have always operated in the universe in the past and apply everywhere in the universe.
Explanation:
The Earth is always _______ as it revolves around the sun.
Fill in the blank
Get Brainliest if correct.
Answer
Rotating
Explanation:
The Earth is always being pulled towards the Sun by gravity.
The Earth is not moving fast enough to "escape" the Sun's gravity and leave the solar system, but it is going too fast to be pulled into the Sun. Therefore, it keeps going around and around( roating)- orbiting the Sun.
Answer:
Rotating around the sun
What is the correct electron configuration for the ion K+?
1s22s22p63s23p6
1s22s22p63s23p64s1
1s22s22p63s23p64s2
1s22s22p63s1
Answer:
1s22s22p63s23p6
Explanation:
The electronic configuration of K is 1s22s22p63s23p64s1.To form K+1 we remove electron. Thus the electrons configuration of K +1 is 1s22s22p63s23p6.
Hence answer is option A
How have batteries gotten better over time
Answer:
Yes they have gotten better overtime
Explanation:
how is plastic made?
Answer:
Cellulose, Coal, Natural Gas, Salt, and Crude Oil