Chemistry Middle School

Complete the sentence
Ice crystals forming on a
window is a
physical change
chemical change

Answers

Answer 1

Answer:

Explanation:

physical change

Answer 2

The answer is Physical change.

Related Questions

During digestion, what happens in the stomach?

A. All food molecules are broken down into smaller molecules by chemical reactions.

B. Some types of food molecules are broken down into smaller molecules by chemical reactions.

C. Water in the food passes into the blood and travels to other organs where it is used.

D. Food passes into the blood and travels to other organs where it is used in various reactions.

Answers

Answer:

Explanation:

Food is digested in the stomach for several hours. During this time, a stomach enzyme called pepsin breaks down most of the protein in the food. The pancreas and gland cells of the small intestine secrete digestive enzymes that chemically break down complex food molecules into simpler ones.

Answer:

Explanation:

Which concept is a basis of the Declaration of Independence?

Answers

Answer:

Explanation:

Drafting the Declaration of Independence in 1776 became the defining event in Thomas Jefferson's life. Despite Jefferson's desire to return to Virginia to help write that state's constitution, the Continental Congress appointed him to the five-person committee for drafting a declaration of independence. That committee subsequently assigned him the task of producing a draft document for its consideration. Drawing on documents, such as the Virginia Declaration of Rights, state and local calls for independence, and his own draft of a Virginia constitution, Jefferson wrote a stunning statement of the colonists' right to rebel against the British government and establish their own based on the premise that all men are created equal and have the inalienable rights of life, liberty, and the pursuit of happiness.

Through the many revisions made by Jefferson, the committee, and then by Congress, Jefferson retained his prominent role in writing the defining document of the American Revolution and, indeed, of the United States. Jefferson was critical of changes to the document, particularly the removal of a long paragraph that attributed responsibility of the slave trade to British King George III. Jefferson was justly proud of his role in writing the Declaration of Independence and skillfully defended his authorship of this hallowed document.

In this cellular respiration process, some chemical bonds between atoms in oxygen and glucose molecules are _____. As atoms are rearranged, new chemical bonds are _____ between different atoms to produce carbon dioxide gas and water. This process releases energy.

The blank options are broken, and formed.
IXL N.2 7th Grade Science
Understanding the chemistry of cellular respiration

Answers

Answer:

In this cellular respiration process, some chemical bonds between atoms in oxygen and glucose molecules are broken. As atoms are rearranged, new chemical bonds are formed between different atoms to produce carbon dioxide gas and water. This process releases energy.

Answer:
In this cellular respiration process, some chemical bonds between atoms in oxygen and glucose molecules are broken. As atoms are rearranged, new chemical bonds are formed between different atoms to produce carbon dioxide gas and water. This process releases energy.

In this activity, you will investigate how the motion of objects of different masses is affected when the same force is applied to them. You will use the scientific method to set up your experiment. Question__________________________________.

Answers

Answer:if a bot walks up to you what do you do

Explanation:

you slap the F out of them

The density of gold is 19.3 g/cm3. What is the volume of a 13 g gold nugget? (Density: D = )

.25 cm3
.67 cm3
1.48 cm3
2.50 cm3
Explain how you found your answer

Answers

It is .67 cm3 cause that’s right

Volume = mass/density
V = 13/19.3
V = 0.67

What is the charge on the Cr in Cr2O72-

Answers

Answer:

+6.

Explanation:

So, a chromium atom here has an oxidation number of +6.

In the dichromate ion, the oxidation number of chromium is+6. The sum of the oxidation numbers in Cr2O72-, a polyatomic ion, is -2, the charge of the ion.

What role do bacteria play in healthy soil?

A. They help keep the soil loose enough for plant roots to grow.

B. They provide stability for the plants in the soil.

C. They hold tiny pockets of air so roots can breathe.

D. They help break down minerals in the soil into a form that plants can absorb.

Answers

Answer:

B I think

Explanation:

improved soil structure and soil aggregation, recycling of soil nutrients, and water recycling.

i also agree that the correct answer is B.

Can someone please help me here is the question i will give u extra points All of the following can be inherited traits except for:

Answers

Answer:

dialect.

Explanation:

if you look at parents and their children. you see their eyes and you see the child's eyes. they could have the same eyes. if you look at both noses you can see that one is similar to the other one. hair texture, lets say a mom has thin hair, and the father also has thin hair. the child more likely will have thin hair as well. you only inhertit dialect when your around that person for a long time.

Answer is D I’m pretty sure

What is an example of variation in a behavioral adaptation of an individual in a population?

A. a bird that migrates to a warmer region
B. a rabbit with brown fur
C. a cows stomach being able to digest cellulose
D. a rose that has many thorns

Answers

a rabbit with brown fur

it would be a rabbit with brown fur because it is the only one that shows adaptation.

What is Acid ?
please don't report , don't give link and give the correct answer .

Answers

Answer:

An acid is a molecule or ion capable of donating a proton, or, alternatively, capable of forming a covalent bond with an electron pair. The first category of acids are the proton donors, or Brønsted–Lowry acids.

Answer:

Below in Bold

✧ $ \underline{ \underline{ \red{ \large{ \tt{E \: X \: P \: L \: A \: N \: A \: T \: I \: O \: N}}}} }: $

♨ The word ' acid ' is derived from the Latin word ' acidus ' which means sour. An acid is defined as the substance which gives hydrogen ions or protons ( H+ ) when dissolved in water. For example :

Hydrochloric acid Sulphuric acid Nitric acid Carbonic acid Acetic acid

✎ $ \underline{ \underline{ \purple{ \large{ \tt{Extra \: Info}}}}} : $

☃ Physical properties :

Acids have a sour taste. But some acids like steric acid, boric acid , salisylic acid do not have a sour taste. Laboratory acids are more corrosive , so they are dangerous to taste.Acid turn blue colour of litmus paper into red and light yellow methyl orange into red. They make phenolphthalein colourless.

☂ Chemical properties :

Acids have a high dissolving power and dissolve many substances. Some metals like zinc and magnesium react with acids like dilute sulphuric acid and dilute hydrochloric acid to produce salt and hydrogen gas.Acid react with base to give salt and water.Acid gives H+ ions when dissolved in water.Acid react with metallic carbonates to produce carbon dioxide.

☼ Hope I helped! ♡

Have a wonderful day / night ! ツ

☥ $ \underbrace{ \overbrace{ \mathfrak{Carry \:On \: Learning}}}$

▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁

The number of atoms in a grapefruit would be equivalent to

Answers

C is the answer to this problem

A thickness of a material is a factor that affects heat conductivity. Does heat flow faster through a thick or a thin piece of the same material?
The surface area of a material is a factor that affects heat conductivity. Does heat flow faster through a large surface area or through a small surface area? Why? (Hint: Think about the number of particles available to bump into one another).

Change in temperature is a factor that affects heat conductivity. Will heat flow faster when there’s a large change in temperature or a small change in temperature?

Answers

Answer: It would flow through a thin piece of material easier.

Explanation:

Answer:It would flow through a thin piece of material easier.

Describe three abiotic and three biotic components of an ocean marine ecosystem.

Answers

Answer:

abiotic sand sunlight water currents

biotic fish bacteria jellyfish

pretty sure this is right

because biotic is living and abiotic is nonliving

Abotic sand
Boric fish

When the speed of the bottle is 2 m/s, the KE is kg m2/s2. When the speed of the bottle is 3 m/s, the KE is kg m2/s2. When the speed of the bottle is 4 m/s, the KE is kg m2/s2. When the speed of the bottle is 5 m/s, the KE is kg m2/s2. When the speed of the bottle is 6 m/s, the KE is kg m2/s2.
instructions
In this part of the experiment, you will be changing the speed of the bottle by dropping it from different heights. You will use the same mass, 0.250 kg, for each trial, so record this mass in Table B for each velocity. Then, calculate the expected kinetic energy (KE) at each velocity. Use the formula KE = mv2,
where m is the mass and v is the speed. Record your calculations in Table B of your Student Guide.

Answers

Answer:

Based on the given instructions, you need to calculate the expected kinetic energy (KE) at each velocity using the formula KE = mv^2, where m is the mass and v is the speed. The mass is given as 0.250 kg.

Table B: Calculation of Kinetic Energy (KE)

Speed (m/s)Mass (kg)KE (kg m^2/s^2)20.2500.50030.2500.75040.2501.00050.2501.25060.2501.500

To calculate the kinetic energy at each velocity, multiply the mass (0.250 kg) by the square of the velocity.

For example, when the speed of the bottle is 2 m/s: KE = (0.250 kg) * (2 m/s)^2 = 0.250 kg * 4 m^2/s^2 = 1.000 kg m^2/s^2

Perform similar calculations for the other velocities and record the results in Table B.

Answer:

Explanation:mass of the bottle in each case is M = 0.250 kg

now as per given speeds we can use the formula of kinetic energy to find it

1) when speed is 2 m/s