Answer:
Bismuth ( Bi )
Explanation:
object with a mass of 30 kg is observed to accelerate at the rate of 4 m/s2. Calculate the force required
is Tungsten carbide an elementary substance
or compound?
Answer:
Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms.
Answer:compound
Explanation:
3 points
5. Which of the following is true regarding the atoms involved in a
chemical reaction? *
a) During a chemical reaction, atoms will always be combined into much larger
molecules.
b) Some of the atoms will always be changed into a different type of atom by a
chemical reaction.
c) Some of the atoms present before the reaction will always be lost during a
chemical reaction.
d) The same number of each type of atom will always be present before and after a
chemical reaction takes place.
What is the number of particles in 15.0 g of H2O?
Answer:
We know that 18 g of H2O contains 1 mole (or 6.022 x 10^23) molecules of water because the molar mass of H2O is 18 g/mol.
So 1 g water will contain 1/18 moles of H2O molecules.
Now 15 g of water will contain 15/18 moles of H2O.
So molecules of H2O = (15/18) x 6.022 x 10^23 = 5 x 10^23 molecules.
Explanation:
I learned this in science hope this helps.
Lunar Eclipse. Choose ALL that apply
Question 1 options:
Earth casts its shadow on the moon
The moon turns dark
Light from the sun is blocked
Earth is directly between the moon and sun
Question 2 (0.5 points)
Solar Eclipse: Choose ALL that apply
Question 2 options:
The Earth is directly between the moon and sun
Earth casts a shadow on the moon
Moon moves between the sun and Earth
The moon blocks out the light of the sun and casts a shadow onto the Earth
In this exercise we have to use the knowledge of lunar eclipse to identify the alternatives that correspond to this effect, as follows:
Light from the sun is blockedEarth is directly between the moon and sunWhat is lunar eclipse?A lunar eclipse happens when the Earth is between the Moon and the Sun, at times when they are aligned. Depending on the position of the Moon, it is total, partial or penumbral. Different stages of a lunar eclipse on a full moon night.
Now, use the knowledge of solar eclipse to identify the alternatives that correspond to this effect, as follows:
Moon moves between the sun and EarthThe moon blocks out the light of the sun and casts a shadow onto the EarthWhat is the definition of solar eclipse?Solar eclipse is an astronomical phenomenon that occurs when the Moon is positioned between the Earth and the Sun, hiding the light emitted by the star towards the planet.
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True or False: Once the formulas for the reactants and the products are determined, the subscripts may not be changed.
Answer:
true
Explanation:
tvyvyvtvtvtbbtbb
4. Which of the following describes a hydrogen bond? *
a) the bond between two
hydrogen atoms within a molecule of water
b) the bond between hydrogen in one water molecule and another hydrogen in a different water molecule
c) the bond between hydrogen and oxygen within a molecule of water
d) the bond between hydrogen in one water molecule and oxygen in a different water molecule
The statement that describes a hydrogen bond is the bond between hydrogen in one water molecule and another hydrogen in a different water molecule. The correct option is b.
What are hydrogen bonds?Hydrogen bonds are the bonds that are formed between water molecules and other molecules that join with hydrogen. These are weak bonds. This bond is formed between hydrogen atoms and other atoms.
One of the bonds that allow molecules to associate is the hydrogen bond. It happens when hydrogen forms a covalent bond with an element that is extremely electronegative, such as oxygen, nitrogen, or sulfur.
Thus, the correct option is b) the bond between hydrogen in one water molecule and another hydrogen in a different water molecule.
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Compare and contrast stomata with the pores found in liverworts. Compare and contrast stomata with the pores found in liverworts. Stomata doesn't allow CO2 to diffuse and cannot be closed if conditions become dry. Liverwort pores allow gas exchange and cannot be closed either if conditions become dry. Stomata allow CO2 to diffuse and can close to minimize water loss. Liverwort pores doesn,t allow gas exchange and cannot be closed if conditions become dry. Stomata allow CO2 to diffuse and can close to minimize water loss. Liverwort pores allow gas exchange and cannot be closed if conditions become dry. Stomata allow CO2 to diffuse and cannot be closed if conditions become dry. Liverwort pores allow gas exchange and can close to minimize water loss.
Answer: Stomata allow CO2 to diffuse and can close to minimize water loss. Liverwort pores allow gas exchange and cannot be closed if conditions become dry.
Explanation:
In the kingdom plantae, the liverworts belong to the phylum Bryophyta. A liverwort has a simple structure, ribbon- like body, that lies flat on the ground and is attached to the soil by many rhizoids. They grow in damp places on land and are capable of controlling gaseous exchange through the pores found on their leaf surfaces. Liverworts are non- vascular plants therefore they lack stomata. Unlike the stomata of vascular plants which close in dry weather, the air pores of liverworts remain open all the time. Liverworts cannot control their water loss (transpiration) through the pores.
Stomata are found in the epidermal layer of leaves in vascular plants. The opening and closing of stomata, through the help of the guard cells, control the flow of gases in and out of the leaves. This control is necessary to prevent excessive loss of water as vapour from the plant body throughout transpiration. Changes in the solute concentration of the guard cells cause water to flow in and out of the leaf epidermal cells.
Therefore, to COMPARE the stomata with pores of liverworts, they both allow gaseous exchange but in CONTRAST, stomata has the ability to control water loss as it can open and close while the pores lack this ability.
Scientific investigations must be well __________ to be sure the data collected will help answer the scientist's question
Answer:
The answer is relevant.
Scientific investigations must be well relevant to be sure the data collected will help answer the scientist's question.
What is a scientific investigation?A scientific investigation is an investigation that is done in the field of science. This unravels the secrets of the earth and the logical reason behind the things happening.
There are three types of scientific investigations. They are descriptive investigation, comparative investigation, and experimental investigation. When we see a thing happening in the environment or anywhere, always find a reason behind it.
The steps in completing a scientific investigation are:
Asking questionsTo make a hypothesis.Performing research.Making an observation.Analyzing the result.Thus, the scientific investigations must be well relevant to the data.
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1. Why do you think it is so important to think about momentum in the NASCAR world? Use the
equation for momentum (momentum = mass times velocity) in your answer. (Hint: NASCAR
drivers drive really fast.] 1 point
Answer:
because it is
Explanation:
simple
Answer:
Explanation: none
What is the formula for S2O5
Answer:
chemical formula
Explanation:
An ideal gas fills a balloon at a temperature of 227ºC and standard pressure. By what factor will the volume of the balloon change if the gas in the balloon is heated to 327ºC at standard pressure? Identify which gas law applies and show your work to receive full credit. Highlight the correct answer below. (2 points)
a. 227/327
b. 5/6
c. 6/5
d. 2/1
e. 327/227
Answer:
e. 327/227
Explanation:
This is the correct standard pressure.
An experiment requires 0.38 M NH3(aq). The stockroom manager estimates that 15 L of the base is needed. What volume of 15 M NH3(aq) will be used to prepare this amount of 0.38 M base? Answer in units of mL.
Answer:
480 mL
Explanation:
15L of 0.38M of NH3(aq.) means that we require 15x0.38 moles of NH3.
this is to be provided by 15M x V.
Where V is volume in Liters.
These are equal
⇒15M x V = 15x 0.48
Hence, Volume required V = 0.48L =480mL
what is the mass, in grams, of potassium in 12.5 g of k
Answer:
Option d)3.32 g is correct.
Explanation:
hope this helps
A piece of wood that measures 3 cm by 6 cm by 4 cm has a mass of 80 g. What is the density of the wood? If the density of water is 1 g/mL, would the wood float in water? Explain.
Answer: yes
Explanation:
True or false? To prepare 20.0 mL of 2.00 M solution of hydrochloric acid from a 10.0 M stock solution, you should take 4.00 mL of the stock solution and add 20.0 mL of water.
False. To prepare 20.0 mL of 2.00 M solution of hydrochloric acid from 10.0 M stock solution, 4.0 mL of the stock solution and 16.0 mL of water would be needed.
Recall the law of diffusion that:
C1V1 = C2V2, where C1 = initial concentration, V1 = initial volume, C2 = final concentration, and V2 = final volume.
In this case, if C1 =10.0 M, V1 = ?, C2 = 2.00 M and V2 = 20.0 mL
V1 = 2 x 20/10
= 4.0 mL
Hence, 4.0 mL of the stock solution would be taken. Since the final volume is 20.0 mL, only 16.0 mL of water would need to be added and not 20.0 mL.
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After eating, nutrients must be oved to other parts of the body. Which of the following systems will transport these nutrients.
nervous
digestive
circulatory
excretory
Answer:
The circulatory system
Explanation:
3. The mass percent of nitrogen in NH4Cl is *
O 16.7% nitrogen
0 25.0% nitrogen
0 26.2% nitrogen
O none of these
Answer:
None of these
Explanation:
The mass percent is 35.4% (3 s.f.)
14/4+35.5 = 14/39.5 x 100 = 35.4 (3 s.f.)
Is aloe vera a living or non-living thing?
Answer:
It is a living plant
Explanation:
How can an unbalanced force affect an object?
O Unbalanced forces keep an object at rest.
Unbalanced forces cause objects to accelerate.
O Unbalanced forces cannot affect on object.
Each solute in the table is mixed in a volume of 500 mL of water. Organize the solutions from least conductive to most conductive.
A)
4,2,1,3
B)
4, 1, 2, 3
C)
2, 4, 3,1
D)
1, 3, 4,2
Answer:
b
Explanation:
Answer:
B) 4,1,2,3
Explanation:
Did it on USA Test prep. :)
Calculate the calories of heat required to melt 35.0 g of ice.
Answer:
35.0g of ice at 0 degrees
Explanation:
(PHYSICAL SCIENCE) Help please !!
A rock collection comes from which part of Earth?
A. atmosphere
B. biosphere
C. geosphere
D. hydrosphere
Answer:
c
Explanation:
I looked the answer up it said it was geosphere
Answer:
the answer is geosphere
Explanation:
i hope it helps you
lord omg okay help pls lol
Explanation:
answer is A cell membrane
( you are bad at biology too anyways that's just a joke)
is it true or false?
Answer:
The rainforest is teeming with animals and insects, so you would hear humming. Frogs and birds make some of the loudest rainforest sounds.
howler monkeys, are the loudest so i think that its false cause lost of animals are there but some can be quiet
What is needed for our cells to get energy from our food?
Answer:
cellular respiration is needed for our cells to get energy from our food.
Explanation:
Through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP.
The chemical symbols of hydrogen, calcium and chlorine are:
H, C, Cl
H, C, Cn
H, Ca, Cl
Hn, Cal, Cl
Answer:
H, Ca, Cl is the answer dude
Answer:
hydrogen is H
calcium is Ca and chlorine is Cl
Biomes are characterized by temperature, precipitation, and the plant and animal communities that live there.
True or false?
List at least three things that your body strives to keep constant. (9 points) Think about what
aspects of your body overall, of one body organ, or of your blood stay nearly unchanged all the time
Answer:
Temperature, heart rate and blood flow.
Explanation:
The three things that our body strives to keep constant in overall body aspect are Temperature, heart rate and blood flow.
What is the Importance of Life process ?Life processes are important to carry out daily life activities. They help to produce energy and maintain homeostasis in the body. The life processes help a body survive with the changes in the environment.A slight disturbance in any of the life processes disturbs the entire functioning of the body.
Therefore ,
The Three things that our body strives to keep constant in overall body aspect are Temperature, heart rate and blood flow.
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