Answer:
Explanation:
Latent heat of fusion of zinc = 7.322 kJ / mol
molecular weight of zinc = 65 g
450 gram = 450 / 65 = 6.92 mole
Heat required to melt 450 g of zinc = 6.92 x 7.322 kJ
= 50.67 kJ .
= 50.7 kJ .
Plz help! This question is due in 10 mins!
Calculate the density of a 5cm3 cube of iron with a mass of 100 g
Answer: 20
Explanation: I’m in your class.
Calculating Density A sample of a sub-
stance with a mass of 85 g occupies a vol-
ume of 110 cm What is the density of
the substance? Will the substance float
in water? Explain your answer:
Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{85}{110} \\ = 0.772727272...[/tex]
We have the final answer as
0.77 g/cm³The substance will float on water since it's density is less than that of water which is
1 g/cm³.
Hope this helps you
A student found the mass of a brick: 50 grams. The volume was 10 cubic centimeters. If the student had 5 bricks, what would be the total density?
Answer:
The answer is 5 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
The mass of one brick is 50 g
the volume of one brick is 10 cm³
Since the student had 5 bricks
Total mass = 5 × 50 = 250 g
total volume = 5 × 10 = 50 cm³
So the total density is
[tex]density = \frac{250}{50} = \frac{25}{5} \\ [/tex]
We have the final answer as
5 g/cm³Hope this helps you
How does a hydra move?....In short form
Answer:
Hydras are generally sessile, but they can detach and move to another location by gliding slowly on their base. Sometimes they somersault, float, or use their tentacles to move along. ... If cut into several sections, a new Hydra will generate from each piece.
Explanation:
Answer:
Hydras are typically sessile, however they are able to detach and flow to every other place via way of means of gliding slowly on their base. Sometimes they somersault, float, or use their tentacles to transport along. ... If reduce into numerous sections, a brand new Hydra will generate from every piece.
How do you convert in the metric system?
Answer:
To convert among units in the metric system, identify the unit that you have, the unit that you want to convert to, and then count the number of units between them. If you are going from a larger unit to a smaller unit, you multiply by 10 successively. If you are going from a smaller unit to a larger unit, you divide by 10 successively
Explanation:
hope it helps
A) Devices that transfer kinetic energy have what for their source of power?
B) Why is burning kerosene for energy not the best solution?
C) Explain why there is not one right why of obtaining energy when it is not available
Answer:
A) Devices that transfer kinetic energy have a source of power that is in motion
Kinetic energy is the energy in motion, as such, a device that transfers kinetic energy transfers the energy the power source has into other energy forms
B) Kerosene does not easily cold start like diesel which can burn after compression
C) The first law of thermodynamics states that energy is conserved and it can neither be created nor destroyed, but can be changed from one form to another.
Therefore, when energy is not available in a given location or body, it cannot be obtained from that body or location
Explanation:
What determines the carrying capacity of an environment
Carrying capacity, or the maximum number of individuals that an environment can sustain over time without destroying or degrading the environment, is determined by a few key factors: food availability, water, and space
you need 16.66ml (+-0.01) of 53.4 (+-0.4)wt% of NaOH with a density of 1.52 (+-0.01)g/mL to prepare 2.00L of 0.169M of NaOH. What is the uncertainty in the molarity of NaOH. FM of NaOH=39.9971 g/mol. Neglect the uncertainty in the final volume and FM.
Answer:
The absolute uncertainty is approximately 1.69 × 10⁻³
Explanation:
The volume needed for NaOH needed to make the solution = 16.66 ml
The wt% of the added NaOH = 53.4 wt%
The volume of the NaOH to be prepared = 2.00 L
The concentration of the NaOH to be prepared = 0.169 M
The molar mass of NaOH = 39.997 g/mol
Therefore, 100 g of sample contains 53.4 g of NaOH
The mass of the sample = 16.66 × 1.52 = 25.3232 g
The mass of NaOH in the sample = 0.534 × 25.3232 = 13.5225888 g ≈ 13.52 g
Therefore;
The number of moles of NaOH = 13.52/39.9971 = 0.3381 moles
Therefore, we have 0.3381 moles in 2.00L solution, which gives;
The number of moles per liter = 0.3881/2 = 0.169045 moles/liter
The molarity ≈ 0.169 M
The absolute uncertainty, u(c) is given as follows;
[tex]u(c) = \sqrt{ \left (\dfrac{0.01}{16.66} \right )^2 + \left ( \dfrac{0.4}{53.4} \right )^2 + \left ( \dfrac{0.01}{1.52} \right )^2 } \times 0.169 \approx 1.69 \times 10^{-3}[/tex]
The absolute uncertainty, u(c) ≈ 1.69 × 10⁻³.
what is the energy
Answer:
what type energy?
Explanation:
Which is a homogenous mixture?
1. ceasar salad
2. pre-cooked pizza
3. coffee in a cup
4. different color beads in a bowl
Answer:
ceasar said is a homogeneous mixture
Answer:
ceasar salad
, glucose is converted into what three products? science
Answer:
carbon dioxide, water, sunlight
need a top pick for another slide to talk about crystals
Answer:
tigers eyes
Explanation:
In an isotope, what does the 'u' stand for?
For example: Lithium isotope: Li-6 6u
The u after 6
Which step in the Scientific Method should be done after asking a question and before developing a hypothesis? A)analyze the data
B)communicate findings
C) conduct background research D)design an experiment
Which is a chemical property of oxygen?
1.It reacts with iron to form rust.
2.It is a gas at room temperature.
3.It expands when heated.
4.It combines to form O 2 molecules.
Answer: I think the answer is 1
i just learned this about two weeks ago
Explanation:
what acts as a buffer for seawater ?
Answer:
The bicarbonate and carbonate ions.
Explanation:
Probably not he answer your looking for though. So, CO2.
What are alternative periodic tables
In what type of inheritance do you see both traits on the same individual, but not
blended?
a. Incomplete Dominance
b. Codominance
c. Both
d. Neither
What kind of investigation are best for demonstrating cause and effect
AgF (aq) + KNO3 (aq) →
Answer:
AgF (aq) + KNO₃ (aq) → AgNO₃(aq) + KF(aq)
Explanation:
AgF (aq) + KNO₃ (aq) →
The products from the equation above can be obtained as follow:
1. AgF and KNO₃ will dissociate in solution as shown below:
AgF (aq) —> Ag⁺(aq) + F¯(aq)
KNO₃ (aq) → K⁺(aq) + NO₃¯(aq)
2. A double displacement reaction will occur between AgF and KNO₃ as illustrated below:
AgF (aq) + KNO₃ (aq) →
Ag⁺(aq) + F¯(aq) + K⁺(aq) + NO₃¯(aq) → Ag⁺NO₃¯(aq) + K⁺F¯(aq)
AgF (aq) + KNO₃ (aq) → AgNO₃(aq) + KF(aq)
A careful observation of the above equation shows that the equation is balanced.
How does a cold trap catch pollutants in smog?
Answer:
A temperature inversion occurs when air near the ground is relatively cool, and there is a layer of warmer air above it. That upper layer of warm air keeps the cooler air from rising, and traps all of the pollution in the cooler, lower layer.
Explanation:
Hope this helps
Crown me as brainliest:)
which describes the substances that form covalent bonds
Answer:
both Non metal's G
Explanation:
i did the test
Which metals have similar chemical properties?
barium
beryllium
rubidium
radium
titanium
calcium
platinum
Answer:
Barium
Beryllium
Radium
Calcium
Explanation:
The __________________ in a chemical formula tells you how many atoms you have of a particular element.
chemical symbols
arrow
subscript
coefficient
I believe the answer is subscript
PLEASE HELP 30 POINTS
Because the rock is irregularly shaped, you used the displacement method to measure its volume.
You used (______) to indirectly find the (_____) of the objects.
Options for the 1st fill in the blank:
- a balance
- calculations
- a graduated cylinder
Options for the 2nd fill in the blank:
- density
- mass
- area
Answer:
Because the rock is irregularly shaped, you used the displacement method to measure its volume. You used calculations to indirectly find the density of the objects.
PLZ Brainliest
Because the rock is irregularly shaped, you used the displacement method to measure its volume. You used calculations to indirectly find the density of the objects. Thus, option 1. b and 2. a is correct.
What is density?"Density has been defined as the ratio of the mass of the object to the volume of the substance." The mass of the object must be in grams and the volume is in the liter, milliliter, or cubic centimeter.
The density of the irregular-shaped rock can be calculated by the displacement method so that the volume of the rock can be estimated. The displacement method is used to calculate the volume of irregularly shaped objects. The formula is given as,
m = ρV
Here, m is mass, ρ is density and V is volume.
Therefore, the indirect calculation can be used to estimate the density.
Learn more about density, here:
https://brainly.com/question/6107689
#SPJ2
Select all the correct answers.
Regina is testing this hypothesis:
Higher relative humidity leads to faster growth in orchids.
She has designed an experiment in which she will grow orchids in terrariums of varying humidity levels. She will then observe how the humidity affects the growth of the plants.
Which of the following variables are the confounding variables that Regina should control for before beginning her experiment?
1.the amount of sunlight the plants receive
2.the temperature at which the plants grow
3.the type of soil in which the plants grow
4.the growth rate of each of the plants
5.the relative humidity inside each terrarium
Answer:1,2,&3
Explanation:
four and five would not qualify as confounding variable‘s
Could someone answer this for me?
Answer:
B
Explanation:
how many molecules are in 3.40L of H2O vapor at STP?*
Answer:
9.14 x 10^22 molecules
Explanation:
Which set of elements below are the most similar to each other?
Explanation:
O, S, Se
because they belong to same group (Group 16).
What is the independent variable in this experiment?
Answer:
D
Explanation:
because it was the variable that was changed in the experiment. distance was controlled and speed changed with time.