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alex41 [277]
3 years ago
8

one ball rolls along a shelf at a steady rate. a second ball rolls off the shelf and gains speed as it falls in a curved path. w

hich must have an unbalanced force acting on it?
Chemistry
1 answer:
Salsk061 [2.6K]3 years ago
6 0
The ball that rolls at a steady rate
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Answer:  (1) Inhales (breathes in) Oxygen - good for the body - gives it to the Circulatory System to be transported throughout the body through the blood. (1) Digestive System gets nutrients (good) from food and hands it over to the blood and Circulatory System then carries those nutrients where they need to go.

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Which compound is composed of oppositely charged ions? A. OCl2 B. Na2O C. NH3 D. SCl2
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It would be B, so yeah hope that helps ya ;)

5 0
3 years ago
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instrucions classify the following reactions as synthesis, decomposition,single replacement, double replacement, or combustion.
My name is Ann [436]

Answer:

There are no specific equations but here what i can give you:

1. Synthesis -- A synthesis reaction is a chemical change in which two or more substances react to form a single new substance.

In all synthesis reactions, there is a single product that is a compound!

2. Decomposition -- A decomposition reaction is a chemical change in which a single compound breaks down into two or more simpler products. (This is the opposite of synthesis reactions!)

Most decomposition reactions require energy in the form of heat, light, and electricity.

3. Single Replacement -- A single-replacement reaction is a chemical change in which one element replaces a second element in a compound. You can identify a single-replacement reaction by noting that both the reactants and the products consist of an element and a compound.

4. Double Replacement -- A double-replacement reaction is a chemical change involving an exchange of positive ions between two compounds.

For a double replacement reactions to occur, one of the following is usually true:

- One of the products is only slightly soluble and precipitates from solutions.

- One of the products is a gas.

- One product is a molecular compound such as water.

5. Combustion -- A combustion reactions is a chemical change in which an element or a compound reacts with oxygen, often producing energy in the form of heat or light.

A combustion reactant always involves oxygen as a reactant. (If the supply of oxygen is limited, then the combustion will not be complete.)

The other reactant is a hydrocarbon, which is a compound composed of hydrogen and carbon and the complete combustion of a hydrocarbon produces CO2 and H2O.

Hydrocarbons include methane, propane, and butane.

I really hope this helps you!

3 0
3 years ago
what is ( H+) and (OH-) in a healthy person's blood that has a PH of 7.50 assume that the temperature of the blood is 298 K.
AlekseyPX

pH = - log [H⁺]

pH = 7.5

\tt [H^+]=10^{-7.5}=3.16\times 10^{-8}

pH + pOH = 14

7.5 + pOH = 14

pOH = 6.5

\tt [OH^-]=10^{-6.5}=3.16\times 10^{-7}

5 0
2 years ago
A solenoid is a coil of wire that produces a magnetic field when carrying an electric current. The strength of the magnetic fiel
BaLLatris [955]

Answer: Motion, providing a burst of power that can move a specific part of the device.

Explanation: Hope this helps

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