Can someone help me please.

Answer:

1.76 g/mL

Explanation:

You need to find the volume.  You can do this by subtracting the volume of the water and the rock by the volume of the water.

72.7 mL  -  50 mL  =  22.7 mL

Now that you have volume, divide the mass by the volume to find the density.

39.943 g/22.7 mL = 1.76 g/mL

Answer:

1730 cm

0.00256 km

5130 mm

Answer:

The electron

Explanation:

The electron will be the lightest subatomic particle.

Answer:

The electron

Explanation:

Electron, lightest stable subatomic particle known. It carries a negative charge, which is considered the basic unit of electric charge. The rest mass of the electron is 9.10938356 × 10 −31 kg, which is only 1/1,836 the mass of a proton.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

density of iron = 7.874 g/cm³

volume = final volume of water - initial volume of water

volume = 57.65 - 54.32 = 3.33 mL

We have

mass = 7.874 × 3.33 = 26.22042

We have the final answer as

Hope this helps you

Answer:

In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Showing that Mass cannot be created nor destroyed in a chemical reaction

Explanation:

Where is the word problems? Like the problems that you have to put it in.

Explanation:

Answer:

It's pitch

Explanation:

I play violin and it would be the same. Pitch is how high a note is. A B in treble clef is higher than a G

Answer:

Over ninety percent of all the atoms in the Universe are hydrogen atoms.

Explanation:

Over ninety percent of all the atoms in the Universe are hydrogen atoms. By mass, hydrogen makes up about 75% of all matter in the Universe. Hydrogen atoms are also the smallest and lightest of all the atoms with only one electron and one proton in a common single hydrogen atom (called protium).

Answer:

through covalent bond

Answer:

1. A claim

2. B evidence

Answer:

A

Explanation:

10,000g

just multiply the amount of hectograms by 100 to get grams

Answer:

Carbon dioxide, water and light are all needed for photosynthesis to take place. Photosynthesis happens in the leaves of a plant.

Explanation:

Answer:

d. compounds and elements

Explanation:

a pure substance is when something is made up of one type of thing, whether it be elements, where they are made up of one type of atom or a compound, where its atoms are chemically bonded and cannot be broken down by physical means

Answer:

Breathe. Breathing is the number one thing every human does, and their bodies need it. Think about going in a pool in 6 feet. You realize that its kinda hard to breathe and it feels like something is holding your chest down really hard. Water pressure and air pressure can affect the breathing habits of a human and can also cause suffocation to the lungs.

Explanation:

please give brainlyest

Answer:

You would have find its valency

Answer:

B - Carbon atoms found in current living things are the same carbon atoms that have always been a part of living things, they are just recycled.

Carbon atoms found in current living things are the same carbon atoms that have always been a part of living things, they are just recycled. Hence, option B is correct.

An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons.

Dinosaurs were the most dominating organism in that time period.

The dinosaurs and the present-day human beings have certain similar characteristics. Some of them are as follows-

Hence, option B is correct.

Learn more about an atom here:

https://brainly.com/question/1566330

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Answer:

890 has 2 significant figures

Explanation:

Answer:

a

Explanation:

its a

Answer:

The rapid motion and collisions of molecules with the walls of the container causes pressure (force on a unit area). Pressure is proportional to the number of molecular collisions and the force of the collisions in a particular area. The more collisions of gas molecules with the walls, the higher the pressure

Answer:

The procedure is Filtration

Explanation:

Filtration is a process that is use to separate insoluble solid from liquid for example Salt and water.

This process uses filter paper which is placed inside a funnel and then placed inside a beaker.

The mixture of sand and water is poured into the the filter paper and water then drains out down to the funnel and the beaker.

The solid part remain at the filter paper and it is called the residue and the water is the filtrate.

Answer:

D: -1

Explanation:

18 protons so +18

19 electrons -19

neutrons dont count there neutral

-19+18= -1

Answer: D: -1

Explanation: All protons have a +1 charge, neutrons are neutral, and electron have a -1 charge. Therefore it can be concluded that if the atom has 18 protons which all have +1 charge and 19 electrons which all have -1 charge, then the atom will have a -1 charge since 18-19=-1

Answer:

Leg swings sounds good but not to sure

Explanation:

I mean in order to play basketball gotta warm up your legs

Answer: Leg swings

Explanation: Leg swings would be best for preparing to sprint because you will have to move you legs very quickly, and leg swings would be a good warm up without tiring yourself out.

Answer:

11.495  grams

Explanation:

I was so happy when I saw the beech tree,there was so much shade

Answer:

The chief trees are beech, oak and conifers. A large area is under forests, the oak, beech, fir, birch and hornbeam being the principal trees.

Explanation:

Answer:

Ammonium bisulfate/Formula

(NH4)HSO4

Reason to answer:

Mark me brainliest

Answer:

water

Explanation:

Because it does not have more than one component.